WO2006038070A2 - Compositions and methods for modulating gated ion channels - Google Patents
Compositions and methods for modulating gated ion channels Download PDFInfo
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- WO2006038070A2 WO2006038070A2 PCT/IB2005/002613 IB2005002613W WO2006038070A2 WO 2006038070 A2 WO2006038070 A2 WO 2006038070A2 IB 2005002613 W IB2005002613 W IB 2005002613W WO 2006038070 A2 WO2006038070 A2 WO 2006038070A2
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- piperidinyl
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
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- A—HUMAN NECESSITIES
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Definitions
- the present invention relates to compositions which modulate the activity of gated ion channels and methods and uses thereof.
- Mammalian cell membranes are important to the structural integrity and activity of many cells and tissues. Of particular interest is the study of trans-membrane gated ion channels which act to directly and indirectly control a variety of pharmacological, physiological, and cellular processes. Numerous gated ion channels have been identified and investigated to determine their roles in cell function.
- Gated ion channels are involved in receiving, integrating, transducing, conducting, and transmitting signals in a cell, e.g. , a neuronal or muscle cell. Gated ion channels can determine membrane excitability. Gated ion channels can also influence the resting potential of membranes, wave forms, and frequencies of action potentials, and thresholds of excitation. Gated ion channels are typically expressed in electrically excitable cells, e.g., neuronal cells, and are multimeric. Gated ion channels may also be found in nonexcitable cells (e.g., adipose cells or liver cells), where they may play a role in, for example, signal transduction.
- nonexcitable cells e.g., adipose cells or liver cells
- gated ion channels that are responsive to, for example, modulation of voltage, temperature, chemical environment, pH, ligand concentration and/or mechanical stimulation.
- specific modulators include, ATP, capsaicin, neurotransmitters (e.g., acetylcholine), ions, e.g., Na + , Ca + , K + , Cl " , Ff 1" , Zn + , Cd + , and/or peptides, e.g., FMRF.
- Examples of gated ion channels responsive to these stimuli are members of the DEG/ENaC, TRPV and P2X gene superfamilies.
- DEG/ENaC proteins are membrane proteins which are characterized by two transmembrane spanning domains, intracellular N- and C-termini and a cysteine-rich extracellular loop.
- DEG/ENaC channels are either constitutively active like epithelial sodium channels (ENaC) which are involved in sodium homeostasis, or activated by mechanical stimuli as postulated for C.
- elegans degnerins or by ligands such as peptides as is the case for FaNaC from Helix aspersa which is a FMRF amide peptide-activated channel and is involved in neurotransmission, or by protons as in the case for the acid sensing ion channels (ASICs).
- ligands such as peptides as is the case for FaNaC from Helix aspersa which is a FMRF amide peptide-activated channel and is involved in neurotransmission, or by protons as in the case for the acid sensing ion channels (ASICs).
- ASICs acid sensing ion channels
- ⁇ ENaC also known as SCNNlA or scnnlA
- ⁇ ENaC also known as SCNNlB or scnnlB
- ⁇ ENaC also known as SCNNlG or scnnlG
- ENaCd also known as ENaCd
- ASICIa also known as ASIC, ASICl, BNaC2, hBNaC2, ASICalpha, ACCN2 and accn2
- ASICIb also known as ASICbeta
- ASIC2a also known as MDEG2, ASIC2b
- ASIC2b also known as MDEG2, ASIC2b
- ASIC3 also known as hASIC3, DRASIC, TNaCl , SLNACl , ACCN3 and accn3
- ASIC4 also known as BNaC4, SPASIC, ACCN4
- P2RX1 also known as P2RX1
- P2X 2 also known as P2RX2
- P2X 3 also known as P2RX3
- P2Xt also known as P2RX4
- P2X 5 also known as P2RX5
- P2X 6 also known as P2RX6
- P2X 7 also known as P2RX7.
- P2X protein structure is similar to ASIC protein structure in that they contain two transmembrane spanning domains, intracellular N- and C-termini and a cysteine-rich extracellular loop.
- AU P2X receptors open in response to the release of extracellular ATP and are permeable to small ions and some have significant calcium permeability.
- P2X receptors are abundantly distributed on neurons, glia, epithelial, endothelia, bone, muscle and hematopoietic tissues. For a recent review on this gene superfamily, see North, R. A. (2002) Physiol. Rev. 82:1013, incorporated herein by reference.
- TRPVl The receptor expressed in sensory neurons that reacts to the pungent ingredient in chili peppers to produce a burning pain is the capsaicin (TRPV or vanilloid) receptor, denoted TRPVl (also known as VRl, TRPVlalpha, TRPVlbeta).
- TRPVl receptor forms a nonselective cation channel that is activated by both capsaicin and resiniferatoxin (RTX) as well as noxious heat (>43°C), with the evoked responses potentiated by protons, e.g., H ions.
- Acid pH is also capable of inducing a slowly inactivating current that resembles the native proton-sensitive current in dorsal root ganglia. Expression of TRPVl , although predominantly in primary sensory neurons, is also found in various brain nuclei and the spinal cord (Physiol. Genomics 4:165-174, 2001).
- TRP V2 also known as VRLl and VRL
- TRP V4 also known as VRL-2, Trpl2, VROAC, OTRPC4
- this family of receptors e.g., the TRPV or vanilloid family
- TRPV (vanilloid) receptors see Szallasi, A. and Blumberg, P.M. (1999) Pharmacol. Rev. 51:159, incorporated herein by reference.
- the ability of the members of the gated ion channels to respond to various stimuli for example, chemical (e.g., ions), thermal and mechanical stimuli, and their location throughout the body, e.g., small diameter primary sensory neurons in the dorsal root ganglia and trigeminal ganglia, as well data derived from in vitro and in vivo models has implicated these channels in numerous neurological diseases, disorders and conditions.
- chemical e.g., ions
- thermal and mechanical stimuli e.g., chemical stimuli, thermal and mechanical stimuli
- these channels in numerous neurological diseases, disorders and conditions.
- the rat ASIC2a channel is activated by the same mutations as those causing neuronal degeneration in C. elegans.
- these receptors are activated by increases in extracellular proton, e.g., H+, concentration.
- transgenic mice e.g., ASIC2a, ASIC3, P2X3 transgenic mice, all have modified responses to noxious and non-noxious stimuli.
- the biophysical, anatomical and pharmacological properties of the gated ion channels are consistent with their involvement in nociception.
- ASICs play a role in pain, neurological diseases and disorders, gastrointestinal diseases and disorders, genitourinary diseases and disorders, and inflammation.
- ASICs play a role in pain sensation (Price, M.P. et al, Neuron. 2001; 32(6): 1071-83; Chen, C-C. et al, Neurobiology 2002; 99(13) 8992-8997), including visceral and somatic pain (Aziz, Q., Eur. J. Gastroenterol. Hepatol. 2001; 13(8):891-6); chest pain that accompanies cardiac ischemia (Mamet, J. et al, J. Neurosci.
- ASICs in central neurons have been shown to possibly contribute to the neuronal cell death associated with brain ischemia and epilepsy (Chesler, M., Physiol. Rev. 2003; 83: 1183-1221; Lipton, P., Physiol. Rev. 1999; 79:1431-1568).
- ASICs have also been shown to contribute to the neural mechanisms of fear conditioning, synaptic plasticity, learning, and memory (Wemmie, J. et al. , J. Neurosci. 2003; 23(13):5496-5502; Wernmie, J.
- ASICs have been shown to be involved in inflammation-related persistant pain and inflamed intestine (Wu, LJ. et al, J. Biol. Chem. 2004; 279(42):43716-24; Yiangou, Y., et al, Eur. J. Gastroenterol. Hepatol. 2001; 13(8): 891- 6), and gastrointestinal stasis (Holzer, Curr. Opin. Pharm. 2003; 3: 618-325). Recent studies done in humans indicate that ASICs are the primary sensors of acid-induced pain (Ugawa et al, J. Clin. Invest.
- the invention provides a method of modulating the activity of a gated ion channel, comprising contacting a cell expressing a gated ion channel with an effective amount of a compound represented by the Formula 1 ,
- A is, independently, either an sp 2 - or sp 3 -hybridized carbon or nitrogen atom
- D is selected from the group consisting of -H, -OH, halogen, -(CH 2 ) 0-6 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from -H, -CN, -CO 2 H, - SO 3 H, -SO 2 H, -PO 3 H 2, -NO 2, -SSO 3 H, halomethyl, dihalomethyl, trihalomethyl, N- methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl or piperidinyl; R 9 (CH 2 ) 0- 6 C00-,
- R 9 is selected from the group consisting of -H, -C 1-4 -alkyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, or piperidinyl; -N(X !
- W is selected from the group consisting of -H, -OH, halogen, - (CH 2 ) O-6 Y, -0-(CH 2 ) O-6 Y, wherein Y is selected from -H, -CN -CO 2 H, -SO 3 H, -SO 2 H, - PO 3 H 2 , -NO 2 , -SSO 3 H, halomethyl, dihalomethyl, trihalomethyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl or piperidiny
- R 5 and R 6 are each, independently, -H, -OH, -(CH 2 ) 0-6 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from -H, -OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO 2 , morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, piperidinyl, alkylcarbonyl, alkylthiocarbonyl, alkoxycarbonyl, aminocarbonyl, -CO 2 H; -SO 3 H; -SO 2 H; -SO 2 NH 2 , -S
- E a is N
- E is C
- R 6 is H
- R 5 is -CHCH 2 or -CH 2 CH 3 .
- a is 1.
- the compound of the invention is represented by the Formula 2,
- a and E are each, independently, an sp - or sp -hybridized carbon or nitrogen atom;
- D is selected from the group consisting of -H, -OH, halogen, -(CH 2 ) 0-6 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from - H, -CN, -CO 2 H, -SO 3 H, -SO 2 H, -PO 3 H 2, -NO 2, -SSO 3 H, halomethyl, dihalomethyl, trihalomethyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl or piperidinyl; R 9 (CH 2 )o -6 COO-, -
- a is 1.
- D is selected from the group consisting of- OC(O)(CH 2 ) 3 CH 3 , -OC(O)CH 2 C(CHs) 3 , -OC(O)(CH 2 ) 2 -cyclopentyl and -
- R 10 is -OCH 3 .
- the compound of the invention is represented by the Formula 3,
- a and E are each, independently, an sp 2 - or sp 3 -hybridized carbon or nitrogen atom;
- D is selected from the group consisting Of-CH 2 CHCH-, -CH 2 CHCHCH 2 -, -O-, -[(CH 2 )i -6 ]-, -O-(CH 2 ) 1-6 -, -O-(CH 2 )i- 6 -N(R 9 )-, -(CH 2 ) I-6 -N(R 9 )-, N(R 9 )-, wherein R 9 is selected from the group consisting of -H, -C M -alkyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazoly
- X 1 and X 2 are each, independently, H, aryl, Ci-C ⁇ -alkyl, esters thereof; salts thereof, and any combination thereof;
- Z is selected from the group consisting of -H, -OH, -(CH 2 ) 0-6 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from -H, -OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO 2 , morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, piperidinyl, alkylcarbonyl, alkylthiocarbonyl, alkoxycarbonyl, aminocarbonyl, -CO 2 H, -SO 3 H; -SO 2
- D is selected from the group consisting of O, N, or C 1-3 -alkyl.
- Z is selected from the group consisting of -H, cyclohexyl, cyclopentyl, phenyl, -CO 2 H or piperidinyl.
- R 6 is selected from the group consisting of -CHCH 2 , or (CH 2 ) 1-3 Y, wherein Y is selected from the group consisting of -H, -OH, Br or CO 2 H.
- R 7 and R 7a are each, independently, selected from the group consisting of -H, -OCH 3 , -NH 2 or -Br.
- R 7 and R 7a form together for a fused 5-membered ring composed of the following bridging bivalent radical: -0-CH 2 -O-.
- f is 0-3.
- D is -0-, e is 1, and f is 1 or 2.
- Z is selected from the group consisting of H, -COOH, cyclopropyl, cyclopentyl, n-butyl and t-butyl.
- R 7 is -OCH 3
- R 7a is H
- R 3 and R 4 are H.
- R 5 is H and R 6 is - CHCH 2 Or-CH 2 CH 3 .
- the compound of the invention is represented by the Formula 4,
- D is selected from the group consisting of -0-, -(CH 2 ) 1-6 -, -N(R )-, wherein R 9 is selected from the group consisting of -H, -d- 4 -alkyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, or piperidinyl; R 5 , R 6 , R 7 and R 7a are each, independently, -H, -OH, -(CH 2 ) 0-6 Y, -0-(CH 2 ) O - 6 Y, wherein Y is selected from -H, -OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO 2
- X 1 and X 2 are each, independently, H, aryl, C 1 -C 6 - alkyl, esters thereof; salts thereof, and any combination thereof;
- Z is selected from the group consisting of -H, -OH, -(CH 2 )o -6 Y, -0-(CH 2 ) O-6 Y, wherein Y is selected from -H, - OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO 2 , morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, piperidinyl, alkylcarbonyl, alkylthiocarbonyl, alkoxycarbonyl, aminocarbonyl, -CO 2 H,
- R 7 and R 7a can also form together for a fused 5- or 6-membered ring composed of one of the following bridging bivalent radicals: -0-CH 2 -CH 2 -, -CH 2 - 0-CH 2 -, -CH 2 -CH 2 -O-, -CH 2 -CH 2 -CH 2 -, -0-CH 2 -O-, -CH 2 -CH 2 -CH 2 -, d and e are each, independently, O or 1; f is 0, 1, 2, 3, 4, 5 or 6.
- D is selected from the group consisting of O, N, or C 1-3 - alkyl.
- Z is selected from the group consisting of — H, cyclohexyl, cyclopentyl, phenyl, -CO 2 H or piperidinyl.
- R 6 is selected from the group consisting of -CHCH 2 , or (CH 2 ) 1-3 Y, wherein Y is selected from the group consisting of -H, -OH, Br or CO 2 H.
- R 7 and R 7a are each, independently, selected from the group consisting of -H, -OCH 3 , -NH 2 or -Br.
- R 7 and R 7a form together for a fused 5-membered ring composed of the following bridging bivalent radicals: -0-CH 2 -O-.
- f is 0-3.
- D is -0-
- e is 1, and f is 1 or 2.
- Z is selected from the group consisting of H, -COOH, cyclopropyl, cyclopentyl, n-butyl and t-butyl.
- R 7 is -OCH 3
- R 7a is H
- R 3 and R 4 are H.
- R 5 is H and R 6 is -CHCH 2 or -CH 2 CH 3 .
- the compound is represented by the Formula 5,
- Z is selected from the group consisting of -H, -OH, -(CH 2 ) 0-6 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from -H, C 1 -C 6 - alkyl, -OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO 2 , morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, piperidinyl, alkylcarbonyl, alkylthiocarbonyl, alkoxycarbonyl, aminocarbonyl, -CO 2 H, -SO 3 H; -SO 2 H; -SO 2 NH 2 , -SSO 3 H, -PO 3 H 2
- the compound is selected from the group consisting of 3- cyclopentyl-propionic acid quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester; cyclopropanecarboxylic acid quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)- methyl ester; succinic acid mono-[quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)- methyl] ester; 3-cyclopentyl-propionic acid (6-methoxy-quinolin-4-yl)-(5-vinyl-l-aza- bicyclo[2.2.2]oct-2-yl)-methyl ester; 2-[(3-cyclopentyl-propionyloxy)-(6-methoxy- quinolin-4-yl)-methyl ester
- the gated ion channel is comprised of at least one subunit selected from the group consisting of a member of the DEG/ENaC, P2X, and TRPV gene superfamilies.
- the gated ion channel is comprised of at least one subunit selected from the group consisting of ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, ASIC4, BLINaC, hINaC, P2Xi, P2X 2 , P2X 3 , P2X 4 , P2X 5 , P2X 6 , P2X 7 , TRPVl, TRPV2, TRPV3, TRPV4, TRPV5, and TRPV6.
- the gated ion channel is homomultimeric. In other embodiments, the gated ion channel is heteromultimeric.
- the DEG/ENaC gated ion channel is comprised of at least one subunit selected from the group consisting of ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, BLINaC, hINaC, ASICl a, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4.
- the DEG/ENaC gated ion channel is comprised of at least one subunit selected from the group consisting of ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4.
- the gated ion channel comprises ASICIa.
- the gated ion channel comprises ASIC3.
- the P2X gated ion channel comprises at least one subunit selected from the group consisting of P2X ⁇ , P2X 2 , P2X 3 , P2X 4 , P2X 5 , P2X 6 , and P2X 7 .
- the TRPV gated ion channel comprises at least one subunit selected from the group TRPVl , TRP V2, TRPV3, TRPV4, TRPV5, and TRPV6.
- the heteromultimeric gated ion channels include the following combinations of gated ion channels: ⁇ ENaC, ⁇ ENaC and ⁇ ENaC; ⁇ ENaC, ⁇ ENaC and ⁇ ENaC; ASIC 1 a and ASIC2a; ASIC 1 a and ASIC2b; ASICIa and ASIC3; ASICIb and ASIC3; ASIC2a and ASIC2b; ASIC2a and ASIC3; ASIC2b and ASIC3; ASICIa, ASIC2a and ASIC3; P2X1 and P2X2; P2X1 and P2X5; P2X2 and P2X3; P2X2 and P2X6; P2X4 and P2X6; TRPVl and TRPV2; TRPV5 and TRPV6; and TRPVl and TRP V4.
- heteromultimeric gated ion channels include the following combinations of gated ion channels: ASICIa and
- ASIC2a ASICIa and ASIC2b; ASICIa and ASIC3; ASIC2a and ASIC2b; ASICIb and ASIC3; ASIC2a and ASIC3; and ASIC3 and ASIC2b.
- the invention provides a method to modulate the activity of the gated ion channel in a subject in need thereof.
- the gated ion channel acitivity is associated with pain.
- the activity of the gated ion channel is associated with an inflammatory disorder.
- the gated ion channel activity is associated with ischemia, hi other embodiments, the activity of the gated ion channel is associated with a neurological disorder.
- the pain is selected from the group consisting of cutaneous pain, somatic pain, visceral pain and neuropathic pain. In another embodiment, the pain is acute pain or chronic pain.
- the cutaneous pain is associated with injury, trauma, a cut, a laceration, a puncture, a burn, a surgical incision, an infection or acute inflammation.
- the somatic pain is associated with an injury, disease or disorder of the musculoskeletal and connective tissue system.
- injury, disease or disorder of the musculoskeletal and connective tissue system is selected from the group consisting of sprains, broken bones, arthritis, psoriasis, eczema, and ischemic heart disease.
- the visceral pain is associated with an injury, disease or disorder of the circulatory system, the respiratory system, the gastrointestinal system, or the genitourinary system.
- the disease or disorder of the circulatory system is selected from the group consisting of ischaemic heart disease, angina, acute myocardial infarction, cardiac arrhythmia, phlebitis, intermittent claudication, varicose veins, myocardial infarction, hypertension and hypotension, rheumatic fever, pulmonary embolism, cerebrovascular diseases (e.g., stroke), atherosclerosis, peripheral vascular disease (e.g., intermittent claudication), thrombophlebitis and haemorrhoids.
- the disease or disorder of the respiratory system is selected from the group consisting of asthma, respiratory infection, chronic bronchitis, chronic obstructive pulmonary diseases, pulmonary oedema, cough, sinusitis, pharyngitis, and emphysema.
- the disease or disorder of the gastrointestinal system is selected from the group consisting of gastritis, duodenitis, irritable bowel syndrome, colitis, Crohn's disease, gastrointestinal reflux disease, ulcers, ulcerative colitis, paralytic ileus, oesophagitis gastroenteritis, gastro-oesophageal reflux disease, hepatitis, cirrhosis and diverticulitis.
- the disease or disorder of the genitourinary system is selected from th ⁇ group consisting of cystitis, urinary tract infections, glomuerulonephritis, polycystic kidney disease, kidney stones, nephritic syndrome, nephritis (e.g., interstitial nephritis), neurogenic bladder, prostatitis, endometriosis, and cancers of the genitourinary system.
- the somatic pain is selected from the group consisting of arthralgia, myalgia, chronic lower back pain, phantom limb pain, cancer-associated pain, dental pain, fibromyalgia, idiopathic pain disorder, chronic non-specific pain, chronic pelvic pain, post- operative pain, and referred pain.
- the neuropathic pain is associated with an injury, disease or disorder of the nervous system.
- the injury, disease or disorder of the nervous system is selected from the group consisting of neuralgia, neuropathy, headache, psychogenic pain, chronic cephalic pain and spinal cord injury.
- the inflammatory disorder is selected from an inflammatory disorder of the musculoskeletal and connective tissue system, the respiratory system, the circulatory system, the genitourinary system the gastrointestinal system or the nervous system.
- the inflammatory disorder of the musculoskeletal and connective tissue system is selected from the group consisting of arthritis (e.g., inflammatory polyarthropathies (e.g., rheumatoid arthritis, juvenile arthritis, polyarthritis, gout), osteoarthritis, rheumatoid arthritis, and spondyloarthropathies), psoriasis, myocitis, dermatitis and eczema.
- arthritis e.g., inflammatory polyarthropathies (e.g., rheumatoid arthritis, juvenile arthritis, polyarthritis, gout), osteoarthritis, rheumatoid arthritis, and spondyloarthropathies)
- psoriasis myoc
- the inflammatory disorder of the respiratory system is selected from the group consisting of asthma, bronchitis, sinusitis, pharyngitis, laryngitis, tracheitis, rhinitis, cystic fibrosis, respiratory infection and acute respiratory distress syndrome.
- the inflammatory disorder of the circulatory system is selected from the group consisting of vasculitis, haematuria syndrome, artherosclerosis, arteritis, phlebitis, carditis and coronary heart disease.
- the inflammatory disorder of the gastrointestinal system is selected from the group consisting of inflammatory bowel disorder, ulcerative colitis, Crohn's disease, diverticulitis, viral infection, bacterial infection, peptic ulcer, chronic hepatitis, gingivitis, periodentitis, stomatitis, gastritis and gastrointestinal reflux disease.
- the inflammatory disorder of the genitourinary system is selected from the group consisting of cystitis, polycystic kidney disease, nephritic syndrome, urinary tract infection, cystinosis, prostatitis, salpingitis, endometriosis, allergy (including allergic rhinitis/sinusitis, skin allergies (urticaria/hives, angioedema, atopic dermatitis), food allergies, drug allergies, insect allergies, and rare allergic disorders such as mastocytosis), autoimmune conditions (e.g., systemic lupus erythematosus, dermatomyositis, polymyositis, inflammatory neuropathies, Guillain Barre syndrome, inflammatory polyneuropathies, vasculitis, Wegener's granulomatosus and polyarteritis nodosa), and genitourinary cancer.
- cystitis e.g., polycystic kidney disease, nephritic syndrome
- the neurological disorder is selected from the group consisting of schizophrenia, bipolar disorder, depression, Alzheimer's disease, epilepsy, multiple sclerosis, amyotrophic lateral sclerosis, stroke, addiction, cerebral ischemia, neuropathy, retinal pigment degeneration, glaucoma, cardiac arrhythmia, shingles, Huntington's chorea, diseases of the eye (e.g., claucoma, chorioretinal inflammation, chroidal degeneration, retinal vascular occlusions, peripheral retinal degeneration, retinopathies (e.g. diabetic retinopathy, atherosclerotic retinopathy), and optic neuropathies), mental and behavioral disorders (e.g., panic attacks and phobias) and Parkinson disease.
- diseases of the eye e.g., claucoma, chorioretinal inflammation, chroidal degeneration, retinal vascular occlusions, peripheral retinal degeneration, retinopathies (e.g. diabetic retinopathy,
- the invention provides a method of treating pain in a subject in need thereof, comprising administering to the subject an effective amount of a compound of Formula 1, Formula 2, Formula 3, Formula 4 and Formula 5.
- the compound is selected from the group consisting of 3-cyclopentyl- propionic acid quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester; cyclopropanecarboxylic acid quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)- methyl ester; succinic acid mono-[quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)- methyl] ester; 3-cyclopentyl-propionic acid (6-methoxy-quinolin-4-yl)-(5-vinyl-l-aza- bicyclo[2.2.2]
- the subject is a mammal.
- the mammal is a human.
- the pain is selected from the group consisting of cutaneous pain, somatic pain, visceral pain and neuropathic pain.
- the pain is acute pain or chronic pain.
- the invention provides a method of treating an inflammatory disorder in a subject in need thereof, comprising administering to the subject an effective amount of a compound of Formula 1, Formula 2, Formula 3, Formula 4, and Formula 5.
- the compound is selected from the group consisting of 3- cyclopentyl-propionic acid quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester; cyclopropanecarboxylic acid quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)- methyl ester; succinic acid mono-[quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)- methyl] ester; 3-cyclopentyl-propionic acid (6-methoxy-quinolin-4-yl)-(5-vinyl-l-aza- bicyclo[2.2.2]oct-2-yl)-methyl ester; 2-[(3-cyclopentyl-propionyloxy)-(6-methoxy- quinolin-4-yl)-methyl ester
- the subject is a mammal.
- the mammal is a human.
- the inflammatory disorder is inflammatory disorder of the musculoskeletal and connective tissue system, the respiratory system, the circulatory system, the genitourinary system, the gastrointestinal system or the nervous system.
- the invention provides a method of treating a neurological disorder in a subject in need thereof, comprising administering an effective amount of a compound of Formula 1, Formula 2, Formula 3, Formula 4 and Formula 5.
- the compound is selected from the group consisting of 3-cyclopentyl- propionic acid quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester; cyclopropanecarboxylic acid quinolin-4-yl-(5 -vinyl- 1 -aza-bicyclo[2.2.2]oct-2-yl)- methyl ester; succinic acid mono-[quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)- methyl] ester; 3-cyclopentyl-propionic acid (6-methoxy-quinolin-4-yl)-(5-vinyl-l-aza- bicyclo[2.2.2]oct-2-yl)-methyl ester; 2-[(3-cyclopentyl-propionyloxy)-(6-methoxy- quinolin-4-yl)-methyl este
- the subject is a mammal.
- the mammal is a human.
- the neurological disorder is selected from the group consisting of schizophrenia, bipolar disorder, depression, Alzheimer's disease, epilepsy, multiple sclerosis, amyotrophic lateral sclerosis, stroke, addiction, cerebral ischemia, neuropathy, retinal pigment degeneration, glaucoma, cardiac arrhythmia, Huntington's chorea, and Parkinson disease.
- the methods of the invention further comprise administering an adjuvant composition.
- the adjuvant composition is selected from the group consisting of opioid analgesics, non-opioid analgesics, local anesthetics, corticosteroids, non-steroidal anti-inflammatory drugs, non-selective COX inhibitors, non-selective COX2 inhibitors, selective C0X2 inhibitors, antiepileptics, barbiturates, antidepressants, marijuana, and topical analgesics.
- the invention provides a pharmaceutical composition comprising a compound of Formulal, Formula 2, Formula 3, Formula 4, Formula 5.
- Figures IA and IB demonstrate results of Formalin tests described herein, demonstrating that compounds A and B both attenuated flinching behaviour compared with injection of vehicle.
- Figure 2 demonstrates concentration response relationships between Compound
- the present invention is based, at least in part, on the identification of compounds useful in modulation of the activity of gated ion channels.
- Gated ion channels are involved in receiving, conducting, and transmitting signals in a cell (e.g., an electrically excitable cell, for example, a neuronal or muscle cell).
- a cell e.g., an electrically excitable cell, for example, a neuronal or muscle cell.
- Gated ion channels can determine membrane excitability (the ability of, for example, a cell to respond to a stimulus and to convert it into a sensory impulse).
- Gated ion channels can also influence the resting potential of membranes, wave forms and frequencies of action potentials, and thresholds of excitation.
- Gated ion channels are typically expressed in electrically excitable cells, e.g., neuronal cells, and are multimeric; they may form homomultimeric (e.g., composed of one type of subunit), or heteromultimeric structures (e.g., composed of more than one type of subunit). Gated ion channels may also be found in nonexcitable cells (e.g., adipose cells or liver cells), where they may play a role in, for example, signal transduction.
- gated ion channel or “gated channel” are used interchangeably and are intended to refer to a mammalian (e.g., rat, mouse, human)multimeric complex responsive to, for example, variations of voltage (e.g., membrane depolarization or hyperpolarization), temperature (e.g., higher or lower than 37°C), pH (e.g., pH values higher or lower than 7.4), ligand concentration and/or mechanical stimulation.
- voltage e.g., membrane depolarization or hyperpolarization
- temperature e.g., higher or lower than 37°C
- pH e.g., pH values higher or lower than 7.4
- ligand concentration ligand concentration and/or mechanical stimulation.
- modulators include, but are not limited to, endogenous extracellular ligands such as anandamide, ATP, glutamate, cysteine, glycine, gamma-aminobutyric acid (GABA), histidine, serotonin (5HT), acetylcholine, epinephrine, norepinephrine, protons, ions, e.g., Na + , Ca +"1" , K + , Cl " , H + , Zn + , and/or peptides, e.g., Met- enkephaline, Leu-enkephaline, dynorphin, neurotrophins, and /or the RFamide related peptides, e.g., FMRFamide and/or FLRFamide; to endogenous intracellular ligands such as cyclic nucleotides ⁇ e.g.
- cyclicAMP cyclicGMP
- ATP ATP
- Ca " " G-proteins
- modulators such as ⁇ -amino-3-hydroxy-5-methyl-4- isolaxone propionate (AMPA), amiloride, capsaicin, capsazepine, epibatidine, cadmium, barium, gadolinium, guanidium, kainate, N-methyl-D-aspartate (NMDA).
- Gated ion channels also include complexes responsive to toxins, examples of which include but are not limited to, Agatoxin ⁇ e.g.
- ⁇ -agatoxin IVA, IVB, ⁇ -agatoxin IVA, TK Agitoxins (Agitoxin 2), Apamin, Argiotoxins, Batrachotoxins, Brevetoxins ⁇ e.g. Brevetoxin PbTx-2, PbTx-3, PbTx-9), Charybdotoxins, Chlorotoxins, Ciguatoxins, Conotoxins ⁇ e.g.
- Gated ion channels are generally homomeric or heteromeric complexes composed of subunits, comprising at least one subunit belonging to the DEG/ENaC, TRPV and/or P2X gene superfamilies.
- DEG/ENaC receptor gene superfamily include epithelial Na + channels, e.g., ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, and/or ⁇ ENaC, the mammalian degenerins (also referred to as MDEG, brain Na + channels (BNaC, BNC) and the acid sensing ion channels (ASICs), e.g., ASICl, ASICIa, ASICIb, ASIC2, ASIC2a, ASIC2b, ASIC3, and/or ASIC4.
- ASICl acid sensing ion channels
- Non-limiting examples of the P2X receptor gene superfamily include P2X 1? P2X 2 , P2X 3 , P2X 4 , P2X 5 , P2X 6 , and P2X 7 .
- Non-limiting examples of the TRPV receptor gene superfamily include TRPVl (also referred to as VRl), TRPV2 (also referred to as VRL-I), TRPV3 (also referred to as VRL-3), TRPV4 (also referred to as VRL-2), TRP V5 (also referred to as ECAC-I), and/or TRP V6 (also referred to as ECAC-2).
- Non limiting examples of heteromultimeric gated ion channels include ⁇ ENaC, ⁇ ENaC and ⁇ ENaC; ⁇ ENaC, ⁇ ENaC and ⁇ ENaC; ASICIa and ASIC2a; ASICIa and ASIC2b; ASICIa and ASIC3; ASICIb and ASIC3; ASIC2a and ASIC2b; ASIC2a and ASIC3; ASIC2b and ASIC3; ASICIa, ASIC2a and ASIC3; ASIC3 and P2X, e.g.
- P2X1, P2X2, P2X3, P2X4, P2X5, P2X6 and P2X7 preferably ASIC3 and P2X2; ASIC3 and P2X3; and ASIC3, P2X2 and P2X3 ASIC4 and at least one of ASICIa, ASICIb, ASIC2a, ASIC2b, and ASIC3; BLINaC (or MNaC) and at least one of ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4; ⁇ ENaC and ASIC, e.g.
- the present invention provides compounds which modulate the activity of a gated ion channel, m some embodiments, the compounds of the invention modulate the activity of a gated ion channel comprised of at least one subunit belonging to the DEG/ENaC, TRPV and/or P2X gene superfamilies.
- the compounds of the invention modulate the activity of the gated ion channel comprised of at least one subunit selected from the group consisting of ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, ASIC4, BLINaC, hINaC, P2X h P2X 2 , P2X 3 , P2X 4 , P2X 5 , P2X 6 , P2X 7 , TRPVl, TRPV2, TRPV3, TRPV4, TRPV5, and TRPV6.
- the compounds of the invention modulate the activity of the DEG/ENaC gated ion channel comprised of at least one subunit selected from the group consisting of ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, BLINaC, hINaC, ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4.
- the compounds of the invention modulate the activity of the DEG/ENaC gated ion channel comprised of at least one subunit selected from the group consisting of ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4.
- the compounds of the invention modulate the activity of the DEG/ENaC gated ion channel comprised of at least two subunits selected from the group consisting of ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4. In yet other embodiments, the compounds of the invention modulate the activity of the DEG/ENaC gated ion channel comprised of at least three subunits selected from the group consisting of ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4. In certain embodiments, the compounds of the invention modulate the activity of a gated ion channel comprised of ASIC, i.e., ASICIa or ASICIb.
- ASIC i.e., ASICIa or ASICIb.
- the compounds of the invention modulate the activity of a gated ion channel comprised of ASIC3. In certain embodiments, the compounds of the invention modulate the activity of a gated ion channel comprised of ASICIa and ASIC2a,; ASICIa and ASIC2a; ASICIa and ASIC3; ASICIb and ASIC3; ASIC2a and ASIC2b; ASIC2a and ASIC3; ASIC2b and ASIC3; ASICIa and ASIC3; and ASICIa, ASIC2a and ASIC3.
- the compounds of the invention modulate the activity of the P2X gated ion channel comprised of at least one subunit selected from the group consisting of P2X l9 P2X 2 , P2X 3 , P2X 4 , P2X 5 , P2X 6 , and P2X 7 .
- the compounds of the invention modulate the activity of a gated ion channel comprised of P2X2, P2X3 or P2X4.
- the compounds of the invention modulate the activity of a gated ion channel comprised of P2X1 and P2X2, P2X1 and P2X5, P2X2 and P2X3, P2X2 and P2X6, and P2X4 and P2X6.
- the compounds of the invention modulate the activity of the TRPV gated ion channel comprised of at least one subunit selected from the group TRPVl 5 TRPV2, TRPV3, TRPV4, TRPV5, and TRPV6.
- the compounds of the invention modulate the activity of a gated ion channel comprised of TRPVl or TRPV2.
- the compounds of the invention modulate the activity of a gated ion channel comprised of TRPVl and TRPV2, TRPVl and TRPV4, and TRPV5 and TRPV6.
- a gated ion channel comprised of TRPVl and TRPV2, TRPVl and TRPV4, and TRPV5 and TRPV6.
- the compound that modulates the activity of a gated ion channel is of the Formula 1,
- A is, independently, either an sp 2 - or sp 3 -hybridized carbon or nitrogen atom
- D is selected from the group consisting of -H 5 -OH, halogen, -(CH 2 )(M 5 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from -H, -CN, -CO 2 H, - SO 3 H, -SO 2 H, -PO 3 H 2 , -NO 2 , -SSO 3 H, halomethyl, dihalomethyl, trihalomethyl, N- methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl or piperidinyl; R 9 (CH 2 ) 0- 6 C
- R 9 is selected from the group consisting of -H, -d- 4 -alkyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, or piperidinyl; -N(X*)X 2 , -SO 2 N(X ⁇ X 2 , or -(CH 2 ) 1-6 SO 2 N(X 1 )X 2 , wherein X 1 and X 2 are each, independently, H, aryl, d-C 6 -alkyl; salts thereof, esters thereof, and any combination thereof; and any combination thereof; or the formula
- R 5 and R 6 are each, independently, -H, -OH, -(CH 2 ) 0-6 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from -H, -OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO 2 , morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, piperidinyl, alkylcarbonyl, alkylthiocarbonyl, alkoxycarbonyl, aminocarbonyl, -CO 2 H; -SO 3 H; -SO 2 H; -SO 2 NH 2 , -SSO 3
- R 1 , R 2 , R 3 , R 4 are each, independently, selected from the group consisting of -H, -OH, halogen, -(CH 2 )O -6 Y, -O- (CH 2 ) O-6 Y, wherein Y is selected from -H, -CN, -CO 2 H, -SO 3 H, -SO 2 H, -PO 3 H 2 , -NO 2 , - SSO 3 H, halomethyl, dihalomethyl, trihalomethyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H
- G is either an sp 2 - or sp 3 -hybridized carbon or nitrogen atom; wherein R 10 has the meaning set forth for R 6 ; and a, b, c and d are each 0 or 1.
- W is
- E a is N
- E is C
- R 6 is H
- R 5 is -CHCH 2 or -CH 2 CH 3 .
- R 1 and R" form together for a fused 5- or 6-membered ring composed of one of the following bridging bivalent radicals (reading from R 1 to R 2 ):
- a is 1.
- a preferred embodiment of Formula 1 is represented as Formula 2,
- a and E are each, independently, an sp 2 - or sp 3 -hybridized carbon or nitrogen atom;
- D is selected from the group consisting of -H, -OH, halogen, -(CH 2 )o -6 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from - H, -CN, -CO 2 H, -SO 3 H, -SO 2 H, -PO 3 H 2 , -NO 2 , -SSO 3 H, halomethyl, dihalomethyl, trihalomethyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl or piperidinyl; R 9 (CH 2 )o -6
- R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are each, independently, -H, -OH, halo, d-Ce-alkyl, -O-d-e-alkyl, -CHCH 2 , -CH 2 CHCH 2 , -(CH 2 ) 0-6 Y, -O-(CH 2 ) 0-6 Y, wherein Y is selected from -H, -CN, -CO 2 H, -SO 3 H, -SO 2 H, -PO 3 H 2, -NO 2, -SSO 3 H, halomethyl, dihalomethyl, trihalomethyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl
- X 1 and X 2 are each, independently, H, aryl, d-C 6 -alkyl; salts thereof, esters thereof, and any combination thereof; R 1 and R 2 can also form together for a fused 5- or 6-membered ring composed of one of the following bridging bivalent radicals (reading from R 1 to R 2 ):
- R 10 has the meaning set forth for R 6 ; and a, b, c and d are each 0 or 1.
- R 1 and R 2 form together for a fused 5- or 6-membered ring composed of one of the following bridging bivalent radicals (reading from R 1 to R 2 ):
- a is 1.
- D is selected from the group consisting of- OC(O)(CH 2 ) 3 CH 3 , -OC(O)CH 2 C(CH 3 ) 3 , -OC(O)(CH 2 ) 2 -cyclopentyl and - OC(O)(CH 2 ) 2 -cyclopropyl.
- R 10 is - OCH 3 .
- a and E are each, independently, an sp - or sp -hybridized carbon or nitrogen atom;
- D is selected from the group consisting of -CH 2 CHCH-, -CH 2 CHCHCH 2 -, -O-, -[(CH 2 ) 1-6 ]- 5 -O-(CH 2 ) 1-6 -, -0-(CH 2 ) L 6 -N(R 9 )-, -(CH 2 ) 1-6 -N(R 9 )-, N(R 9 )-, wherein R 9 is selected from the group consisting of -H, -Ci- 4 -alkyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl or
- b, c, d and e are each O or 1; and f is 0,1, 2, 3, 4, 5 or 6.
- D is selected from the group consisting of O, N, or C 1-3 -alkyl.
- Z is selected from the group consisting of -H, cyclohexyl, cyclopentyl, phenyl, -CO 2 H or piperidinyl.
- R 6 is selected from the group consisting of-CHCH 2 , or (CH 2 ) 1-3 Y, wherein Y is selected from the group consisting of -H, -OH, Br or CO 2 H.
- R and R 7a are each, independently, selected from the group consisting of -H, -OCH 3 , -NH 2 or -Br.
- R 7 and R 7a form together for a fused 5- membered ring composed of the following bridging bivalent radical: -0-CH 2 -O-.
- f is 0-3.
- D is -0-, e is 1, and f is 1 or 2.
- Z is selected from the group consisting of H, -COOH, cyclopropyl, cyclopentyl, n-butyl and t-butyl.
- R 7 is -OCH 3 , R is H, and R and R are H.
- R 5 is H and R 6 is -CHCH 2 or -CH 2 CH 3 .
- D is selected from the group consisting of -O-, -(CH 2 ) 1-6 -, -N(R 9 )-, wherein R 9 is selected from the group consisting of -H, -C 1-4 -alkyl, N-methyl-piperidinyl, morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, or piperidinyl; R 5 , R 6 , R 7 and R 7a are each, independently, -H, -OH, -(CH 2 ) 0-6 Y, -O-(CH 2 ) 0- 6 Y, wherein Y is selected from -H, -OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO
- X 1 and X 2 are each, independently, H, aryl, C 1 -C 6 - alkyl, esters thereof; salts thereof, and any combination thereof;
- Z is selected from the group consisting of -H, -OH, -(CH 2 ) 0-6 Y, -0-(CH 2 )o -6 Y, wherein Y is selected from -H, - OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO 2 , morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, piperidinyl, alkylcarbonyl, alkylthiocarbonyl, alkoxycarbonyl, aminocarbonyl, -CO 2 H, - SO 3 H;
- R 7 and R 7a can also form together for a fused 5- or 6-membered ring composed of one of the following bridging bivalent radicals: -0-CH 2 -CH 2 -
- -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -d and e are each, independently, 0 or 1 ; and f is 0, 1, 2, 3, 4, 5 or 6.
- D is selected from the group consisting of O, N, or Q- 3 -alkyl.
- Z is selected from the group consisting of -H, cyclohexyl, cyclopentyl, phenyl, -CO 2 H or piperidinyl.
- R 6 is selected from the group consisting of- CHCH 2 , or (CH 2 ) 1-3 Y, wherein Y is selected from the group consisting of -H, -OH, Br or CO 2 H.
- R 7 and R 7a are each, independently, selected from the group consisting of -H, -OCH 3 , -NH 2 or -Br.
- R 7 and R 7a form together for a fused 5-membered ring composed of the following bridging bivalent radical: -0-CH 2 -O-.
- f is 0-3.
- D is -0-, e is 1, and f is 1 or 2.
- Z is selected from the group consisting of H, -COOH, cyclopropyl, cyclopentyl, n-butyl and t-butyl.
- R 7 is -OCH 3
- R 7a is H
- R 3 and R 4 are H.
- R 5 is H and R 6 is -CHCH 2 or -CH 2 CH 3 .
- Z is selected from the group consisting of -H, -OH, -(CH 2 )(W 5 Y, -O-(CH 2 ) 0 . 6 Y, wherein Y is selected from -H, C 1 -C 6 - alkyl, -OH, -CN, halo, -CHCH 2 , -CH 2 CHCH 2 , -NO 2 , morpholinyl, hydroxyphenyl, phenyl, piperazinyl, cyclopropyl, cyclopentyl, cyclohexyl, pyridinyl, 5H-tetrazolyl, triazolyl, piperidinyl, alkylcarbonyl, alkylthiocarbonyl, alkoxycarbonyl, aminocarbonyl, -CO 2 H, -SO 3 H; -SO 2 H; -SO 2 NH 2 , -SSO 3 H, -PO 3 H
- Z is selected from the group consisting of H, -COOH, cyclopropyl, cyclopentyl, CH 2 CH 2 CH 3 , n-butyl and t-butyl.
- a preferred embodiment of Formula 4 is 3-cyclopentyl-propionic acid quinolin- 4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester:
- Formula 4 is cyclopropanecarboxylic acid quinolin-4-yl-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester:
- Another preferred embodiment of Formula 4 is succinic acid mono-[quinolin-4- yl-(5-vinyl-l -aza-bicyclo[2.2.2]oct-2-yl)-methyl] ester:
- Another preferred embodiment of Formula 4 is S-cyclopentyl-propionic acid (6-methoxy-quinolin-4-yl)-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester:
- salts thereof e.g., 2-[(3-cyclopentyl-propionyloxy)-(6- methoxy-quinolin-4-yl)-methyl]-5-vinyl-l-azonia-bicyclo[2.2.2]octane dihydrochloride).
- Another preferred embodiment of Formula 4 is 3-cyclopentyl-propionic acid (5- ethyl- 1 -aza-bicyclo [2.2.2] oct-2-yl)-(6-methoxy-quinolin-4-yl)-methyl ester:
- Formula 4 is pentanoic acid (5-ethyl-l-aza- bicyclo[2.2.2]oct-2-yl)-(6-methoxy-quinolin-4-yl)-methyl ester: and pharmaceutically acceptable salts thereof (e.g., 5-ethyl-2-[(6-methoxy-quinolin-4- yl)-pentanoyloxy-methyl]-l-azonia-bicyclo[2.2.2]octane dihydrochloride).
- pharmaceutically acceptable salts thereof e.g., 5-ethyl-2-[(6-methoxy-quinolin-4- yl)-pentanoyloxy-methyl]-l-azonia-bicyclo[2.2.2]octane dihydrochloride.
- Formula 4 is 3, 3 -dimethyl-butyric acid (6- methoxy-quinolin-4-yl)-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester:
- salts thereof e.g., 2-[(3,3-dimethyl-butyryloxy)-(6- methoxy-quinolin-4-yl)-methyl]-5-vinyl-l-azonia-bicyclo[2.2.2]octane dihydrochloride).
- Formula 4 is 3,3-dimethyl-butyric acid (5- ethyl-l-aza-bicyclo[2.2.2]oct-2-yl)-(6-methoxy-quinolin-4-yl)-methyl ester:
- the compounds of the invention that modulate the activity of a gated ion channel are capable of chemically interacting with a gated ion channel, including ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, ASIC4, BLINaC, bINaC, P2Xi, FlX 2 , FlX 3 , PlX 4 , FlX 5 , FlX 6 , FlX 7 , TRPVl, TRPV2, TRPV3, TRPV4, TRPV5, TRPV6.
- chemical interaction is intended to include, but is not limited to reversible interactions such as hydrophobic/hydrophilic, ionic (e.g., coulombic attraction/ repulsion, ion-dipole, charge- transfer), covalent bonding, Van der Waals, and hydrogen bonding.
- the chemical interaction is a reversible Michael addition.
- the Michael addition involves, at least in part, the formation of a covalent bond.
- Acid addition salts of the compounds of Formula 1 are most suitably formed from pharmaceutically acceptable acids, and include for example those formed with inorganic acids e.g. hydrochloric, sulphuric or phosphoric acids and organic acids e.g. succinic, maleic, acetic or fumaric acid.
- Other non-pharmaceutically acceptable salts e.g. oxalates may be used for example in the isolation of the compound of Formula 1, 2, 3 and 4 for laboratory use, or for subsequent conversion to a pharmaceutically acceptable acid addition salt.
- solvates and hydrates of the invention are also included within the scope of the invention.
- aqueous solution of the given salt is treated with a solution of base e.g. sodium carbonate or potassium hydroxide, to liberate the free base which is then extracted into an appropriate solvent, such as ether.
- the free base is then separated from the aqueous portion, dried, and treated with the requisite acid to give the desired salt.
- base e.g. sodium carbonate or potassium hydroxide
- In vivo hydrolyzable esters or amides of certain compounds of Formula 1, 2, 3 and 4 can be formed by treating those compounds having a free hydroxy or amino functionality with the acid chloride of the desired ester in the presence of a base in an inert solvent such as methylene chloride or chloroform.
- Suitable bases include triethylamine or pyridine.
- compounds of Formula 1, 2, 3 and 4 having a free carboxy group may be esterified using standard conditions which may include activation followed by treatment with the desired alcohol in the presence of a suitable base.
- Examples of pharmaceutically acceptable addition salts include, without limitation, the non-toxic inorganic and organic acid addition salts such as the hydrochloride derived from hydrochloric acid, the hydrobromide derived from hydrobromic acid, the nitrate derived from nitric acid, the perchlorate derived from perchloric acid, the phosphate derived from phosphoric acid, the sulphate derived from sulphuric acid, the formate derived from formic acid, the acetate derived from acetic acid, the aconate derived from aconitic acid, the ascorbate derived from ascorbic acid, the benzenesulphonate derived from benzensulphonic acid, the benzoate derived from benzoic acid, the cinnamate derived from cinnamic acid, the citrate derived from citric acid, the embonate derived from embonic acid, the enantate derived from enanthic acid, the fumarate derived from fuma
- Such salts may be formed by procedures well known and described in the art.
- Other acids such as oxalic acid, which may not be considered pharmaceutically acceptable, may be useful in the preparation of salts useful as intermediates in obtaining a chemical compound of the invention and its pharmaceutically acceptable acid addition salt.
- Metal salts of a chemical compound of the invention includes alkali metal salts, such as the sodium salt of a chemical compound of the invention containing a carboxy group.
- the "onium salts" of N-containing compounds are also contemplated as pharmaceutically acceptable salts.
- Preferred “onium salts” include the alkyl-onium salts, the cycloalkyl-onium salts, and the cycloalkylalkyl-onium salts.
- the chemical compound of the invention may be provided in dissoluble or indissoluble forms together with a pharmaceutically acceptable solvents such as water, ethanol, and the like. Dissoluble forms may also include hydrated forms such as the monohydrate, the dihydrate, the hemihydrate, the trihydrate, the tetrahydrate, and the like, hi general, the dissoluble forms are considered equivalent to indissoluble forms for the purposes of this invention.
- the chemical compounds of the present invention may exist in (+) and (-) forms as well as in racemic forms.
- the racemates of these isomers and the individual isomers themselves are within the scope of the present invention.
- Racemic forms can be resolved into the optical antipodes by known methods and techniques.
- One way of separating the diastereomeric salts is by use of an optically active acid, and liberating the optically active amine compound by treatment with a base.
- Another method for resolving racemates into the optical antipodes is based upon chromatography on an optical active matrix.
- Racemic compounds of the present invention can thus be resolved into their optical antipodes, e.g., by fractional crystallisation of d- or I-(tartrates, mandelates, or camphorsulphonate) salts for example.
- the chemical compounds of the present invention may also be resolved by the formation of diastereomeric amides by reaction of the chemical compounds of the present invention with an optically active activated carboxylic acid such as that derived from (+) or (-) phenylalanine, (+) or (-) phenylglycine, (+) or (-) camphanic acid or by the formation of diastereomeric carbamates by reaction of the chemical compound of the present invention with an optically active chloroformate or the like.
- an optically active activated carboxylic acid such as that derived from (+) or (-) phenylalanine, (+) or (-) phenylglycine, (+) or (-) camphanic acid
- optical active compounds can also be prepared from optical active starting materials.
- a chemical compound of the present invention may thus be the syn- or the anti-form (Z- and E- form), or it may be a mixture hereof.
- alkyl includes saturated aliphatic groups, including straight-chain alkyl groups ⁇ e.g., methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, etc.), branched-chain alkyl groups (isopropyl, tert-butyl, isobutyl, etc.), cycloalkyl (alicyclic) groups (cyclopropyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl), alkyl substituted cycloalkyl groups, and cycloalkyl substituted alkyl groups.
- straight-chain alkyl groups ⁇ e.g., methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decy
- alkyl further includes alkyl groups, which can further include oxygen, nitrogen, sulfur or phosphorous atoms replacing one or more carbons of the hydrocarbon backbone.
- a straight chain or branched chain alkyl has 10 or fewer carbon atoms in its backbone (e.g., C 1 -C 10 for straight chain, C 3 -C 10 for branched chain), and more preferably 6 or fewer.
- preferred cycloalkyls have from 4-7 carbon atoms in their ring structure, and more preferably have 5 or 6 carbons in the ring structure.
- halogen represents a fluorine, a chlorine, a bromine or an iodine atom.
- a trihalogenmethyl group represents e.g. a trifluoromethyl group and a trichloromethyl group.
- substituted is intended to describe moieties having substituents replacing a hydrogen on one or more atoms, e.g. C or N, of a molecule.
- substituents can include, for example, alkenyl, alkynyl, halogen, hydroxyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthiocarbonyl, alkoxyl, phosphate, phosphonato, phosphinato, amino (including alkyl amino, dialkylamino, arylamino, diarylamino, and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and ure
- ⁇ aryl includes groups, including 5- and 6-membered single-ring aromatic groups that may include from zero to four heteroatoms, for example, phenyl, pyrrole, furan, thiophene, thiazole, isothiaozole, imidazole, triazole, tetrazole, pyrazole, oxazole, isoxazole, pyridine, pyrazine, pyridazine, and pyrimidine, and the like.
- aryl includes multicyclic aryl groups, e.g., tricyclic, bicyclic, e.g., naphthalene, benzoxazole, benzodioxazole, benzothiazole, benzoimidazole, benzothiophene, methylenedioxyphenyl, quinoline, isoquinoline, napthridine, indole, benzofuran, purine, benzofuran, deazapurine, or indolizine.
- aryl groups having heteroatoms in the ring structure may also be referred to as “aryl heterocycles", “heterocycles,” “heteroaryls” or “heteroaromatics”.
- the aromatic ring can be substituted at one or more ring positions with such substituents as described above, as for example, halogen, hydroxyl, alkoxy, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, alkylaminoacarbonyl, aralkylaminocarbonyl, alkenylaminocarbonyl, alkylcarbonyl, arylcarbonyl, aralkylcarbonyl, alkenylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylthiocarbonyl, phosphate, phosphonato, phosphinato, cyano, amino (including alkyl amino, dialkylamino, arylamino, diarylamino, and alkylarylamino), acylamino (including alkylcarbonylamino, arylcarbonylamino, carbamoyl and
- any combination thereof implies that any number of the listed functional groups and molecules may be combined to create a larger molecular architecture.
- the present invention relates to a method of modulating gated ion channel activity.
- the various forms of the term “modulate” include stimulation (e.g., increasing or upregulating a particular response or activity) and inhibition (e.g., decreasing or downregulating a particular response or activity).
- the methods of the present invention comprise contacting a cell with an effective amount of a gated ion channel modulator compound, e.g. a compound of the invention, thereby modulating the activity of a gated ion channel, hi certain embodiments, the effective amount of the compound of the invention inhibits the activity of the gated ion channel
- the gated ion channels of the present invention are comprised of at least one subunit belonging to the DEG/ENaC, TRPV (also referred to as vanilloid) and/or P2X gene superfamilies.
- the gated ion channel is comprised of at least one subunit selected from the group consisting of ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ASICIa 5 ASICIb, ASIC2a, ASIC2b, ASIC3, ASIC4, BLINaC, hINaC, , P2X h P2X 2 , P2X 3 , P2X4, P2X 5 , P2X 6 , P2X 7 , TRPVl, TRPV2, TRPV3, TRPV4, TRPV5, and TRPV6.
- the DEG/ENaC gated ion channel is comprised of at least one subunit selected from the group consisting of ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, 5ENaC, BLINaC, hINaC, ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4.
- the DEG/ENaC gated ion channel is comprised of at least one subunit selected from the group consisting of ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4.
- the gated ion channel is comprised of ASICIa, ASICIb, or ASIC3.
- P2X gated ion channel is comprised of at least one subunit selected from the group consisting of P2X b P2X 2 , P2X 3 , P2X 4 , P2X 5 , P2X 6 , and P2X 7 .
- the TRPV gated ion channel is comprised of at least one subunit selected from the group TRPVl , TRPV2, TRPV3, TRPV4, TRPV5, and TRPV6.
- the gated ion channel is a heteromultimeric gated ion channel, including, but not limited to, ⁇ ENaC, ⁇ ENaC and ⁇ ENaC; ⁇ ENaC, ⁇ ENaC and ⁇ ENaC; ASICIa and ASIC2a; ASICIa and ASIC2b; ASICIa and ASIC3; ASICIb and ASIC3; ASIC2a and ASIC2b; ASIC2a and ASIC3 ; ASIC2b and ASIC3 ; ASIC 1 a, ASIC2a and ASIC3 ; ASIC3 and P2X, e.g.
- P2X1, P2X2, P2X3, P2X4, P2X5, P2X6 and P2X7 preferably ASIC3 and P2X2; ASIC3 and P2X3; and ASIC3, P2X2 and P2X3; ASIC4 and at least one of ASICIa, ASICIb, ASIC2a, ASIC2b, and ASIC3; BLINaC (or hlNaC) and at least one of ASICIa, ASICIb, ASIC2a, ASIC2b, ASIC3, and ASIC4; ⁇ ENaC and ASIC, e.g.
- Assays for determining the ability of a compound within the scope of the invention to modulate the activity of gated ion channels are well known in the art and described in Examples 1-4. Other assays for determining the ability of a compound to modulate the activity of a gated ion channel are also readily available to the skilled artisan.
- the gated ion channel modulating compounds of the invention may be identified using the following screening method, which method comprises the subsequent steps of (i) subjecting a gated ion channel containing cell to the action of a selective activator, e.g., protons by adjustment of the pH to an acidic level, ATP by diluting sufficient amounts of ATP in the perfusion buffer or temperature by heating the perfusion buffer to temperatures above 37 °C;
- a selective activator e.g., protons by adjustment of the pH to an acidic level, ATP by diluting sufficient amounts of ATP in the perfusion buffer or temperature by heating the perfusion buffer to temperatures above 37 °C;
- the gated ion channel containing cells may be subjected to the action of protons by adjustment of the pH to an acidic level using any convenient acid or buffer, including organic acids such as formic acid, acetic acid, citric acid, ascorbic acid, 2-
- Morpholinoethanesulfonic acid and lactic acid
- inorganic acids such as hydrochloric acid, hydrobromic acid and nitric acid, perchloric acid and phosphoric acid.
- the current flux induced by the activator e.g., protons
- electrophysiological methods for example patch clamp or two-electrode voltage clamp techniques.
- the change in membrane potential induced by gated ion channel activators, e.g., protons of the gated ion channel containing cells may be monitored using fluorescence methods.
- the gated ion channel containing cells are incubated with a membrane potential indicating agent that allows for a determination of changes in the membrane potential of the cells, caused by the added activators, e.g., protons.
- a membrane potential indicating agent include fluorescent indicators, preferably DiBAC 4 (3), DiOC5(3), DiOC2(3), DiSBAC2(3) and the FMP dye (Molecular Devices).
- the change in gated ion channel activity induced by activators, e.g., protons, on the gated ion channel can be measured by assessing changes in the intracellular concentration of certain ions, e.g., calcium, sodium, potassium, magnesium, protons, and chloride in cells by fluorescence.
- Fluorescence assays can be performed in multi-well plates using plate readers, e.g., FLIPR assay (Fluorescence Image Plate Reader; available from Molecular Devices), e.g. using fluorescent calcium indicators, e.g. as described in, for example, Sullivan E., et al. (1999) Methods MoI Biol. 114: 125-33, Jerman, J.C., et al.
- the gated ion channel containing cells are incubated with a selective ion indicating agent that allows for a determination of changes in the intracellular concentration of the ion, caused by the added activators, e.g., protons.
- a selective ion indicating agent that allows for a determination of changes in the intracellular concentration of the ion, caused by the added activators, e.g., protons.
- Such ion indicating agents include fluorescent calcium indicators, preferably Fura-2, Fluo-3, Fluo-4, Fluo4FF, Fluo-5F, Fluo-5N, Calcium Green, Fura-Red, Indo-1, Indo-5F, and rhod-2, fluorescent sodium indicators, preferably SBFI, Sodium Green, CoroNa Green, fluorescent potassium indicators, preferably PBFI, CD222, fluorescent magnesium indicators, preferably Mag-Fluo-4, Mag-Fura-2, Mag- Fura-5, Mag-Fura-Red, Mag-indo-1, Mag-rho-2, Magnesium Green, fluorescent chloride indicators, preferably SPQ, Bis-DMXPQ, LZQ, MEQ, and MQAE, fluorescent pH indicators, preferably BCECF and BCPCF.
- fluorescent calcium indicators preferably Fura-2, Fluo-3, Fluo-4, Fluo4FF, Fluo-5F, Fluo-5N, Calcium Green, Fura-Red, Indo-1, Indo-5F, and rhod-2
- the gated ion channel antagonising compounds of the invention show activity in concentrations below 2M, 1.5M, IM, 50OmM, 25OmM, 10OmM, 750 ⁇ M, 500 ⁇ M, 250 ⁇ M, 100 ⁇ M, 75 ⁇ M, 50 ⁇ M, 25 ⁇ M, 10 ⁇ M, 5 ⁇ M, 2.5 ⁇ M, or below 1 ⁇ m.
- the ASIC antagonising compounds show activity in low micromolar and the nanomolar range.
- the term "contacting" i.e., contacting a cell e.g. a neuronal cell, with a compound
- contacting is intended to include incubating the compound and the cell together in vitro (e.g., adding the compound to cells in culture) or administering the compound to a subject such that the compound and cells of the subject are contacted in vivo.
- the term "contacting” is not intended to include exposure of cells to a modulator or compound that may occur naturally in a subject (i.e., exposure that may occur as a result of a natural physiological process).
- Gated ion channel polypeptides for use in the assays described herein can be readily produced by standard biological techniques or by chemical synthesis.
- a host cell transfected with an expression vector containing a nucleotide sequence encoding the desired gated ion channel can be cultured under appropriate conditions to allow expression of the peptide to occur.
- the gated ion channel can be obtained by culturing a primary cell line or an established cell line that can produce the gated ion channel.
- the methods of the invention can be practiced in vitro, for example, in a cell- based culture screening assay to screen compounds which potentialy bind, activate or modulate gated ion channel function.
- the modulating compound can function by interacting with and eliminating any specific function of gated ion channel in the sample or culture.
- the modulating compounds can also be used to control gated ion channel activity in neuronal cell culture.
- Cells for use in in vitro assays, in which gated ion channels are naturally present include various cell lines, such as cortical neuronal cell lines, in particular mouse or rat cortical neuronal cells, and human embryonic kidney (HEK) cells, in particular HEK293 cells.
- HEK human embryonic kidney
- sensory neuronal cells can also be isolated and cultured in vitro from different animal species.
- the most widely used protocols use sensory neurons isolated from neonatal (Eckert, et al. (1997) JNeurosci Methods 11: 183-190) and embryonic (Vasko, et al. (1994) JNeurosci 14:4987-4997) rat.
- Trigeminal and dorsal root ganglion sensory neurons in culture exhibit certain characteristics of sensory neurons in vivo.
- the gated ion channel e.g., a.
- gated channel e.g., a proton gated ion channel
- a proton gated ion channel may be exogenous to the cell in question, and may in particular be introduced by recombinant DNA technology, such as transfection, microinjection or infection.
- Such cells include Chinese hamster ovary (CHO) cells, African green monkey kidney cell line (CV-I or CV-1-derived COS cells, e.g. COS-I and COS-7) Xenopus l ⁇ evis oocytes, or any other cell lines capable of expressing gated ion channels.
- the nucleotide and amino acid sequences of the gated ion channels of the invention are known in the art.
- the sequences of the human gated channels can be found in Genbank GI Accession Nos: GL40556387 (ENaCalpha Homo sapiens); GI:4506815 (ENaCalpha Homo sapiens); GL4506816 (ENaCbeta Homo sapiens); GL4506817 (ENaCbeta Homo sapiens); GL34101281 (ENaCdelta Homo sapiens);
- GL34101282 (ENaCdelta Homo sapiens); GL42476332 (ENaCgamma Homo sapiens); GI:42476333 (ENaCgamma Homo sapiens); GI:31442760 (HINAC Homo sapiens); GI:31442761 (HINAC Homo sapiens); GI: 21536350 (ASICIa Homo sapiens); GL21536351 (ASICIa Homo sapiens); GI:21536348(ASIClb Homo sapiens); GL21536349 (ASICIb Homo sapiens); GL34452694 (ASIC2; transcript variant 1
- TRPVl transcript variant 4 Homo sapiens
- GI: 18375669 TRPVl; vanilloid receptor subtype 1 Homo sapiens
- GL7706764 VRL-I; transcript variant 1 Homo sapiens
- GL7706765 VRL-I; vanilloid receptor-like protein 1 Homo sapiens
- GL22547178 TRPV2; transcript variant 2 Homo sapiens
- GI:20127551 TRPV2; vanilloid receptor- like protein 1 Homo sapiens
- GL22547183 TRPV4; transcript variant 1 Homo sapiens
- GL22547184 TRPV4; isoform A Homo sapiens
- GL22547179 TRPV4; transcript variant 2 Homo sapiens
- GL22547180 TRPV4; isoform B Homo sapiens
- GL21361832 TRPV5 Homo sapiens
- GI:17505200 TRPV5 Homo sapiens
- GL21314681
- a nucleic acid molecule encoding a gated ion channel for use in the methods of the present invention can be amplified using cDNA, mRNA, or genomic DNA as a template and appropriate oligonucleotide primers according to standard PCR amplification techniques.
- the nucleic acid so amplified can be cloned into an appropriate vector and characterized by DNA sequence analysis.
- nucleic acid molecules of the invention can be isolated using standard hybridization and cloning techniques (e.g., as described in Sambrook et ah, ed., Molecular Cloning: A Laboratory Manual, 2nd ed, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1989).
- Expression vectors containing a nucleic acid encoding a gated ion channel, e.g., a gated ion channel subunit protein, e.g., ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ASICIa, ASICIb, ASIC2a, ASIC2b 5 ASIC3, ASIC4, BLINaC, hINaC,, P2X h P2X 2 , P2X 3 , P2X 4 , P2X 5 , P2X 6 , P2X 7 , TRPVl, TRPV2, TRPV3, TRPV4, TRPV5, and TRPV6 protein (or a portion thereof) are introduced into cells using standard techniques and operably linked to regulatory sequence.
- a gated ion channel subunit protein e.g., ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ⁇ ENaC, ASICIa, ASICIb, ASIC2a, A
- Regulatory sequences include those which direct constitutive expression of a nucleotide sequence in many types of host cell and those which direct expression of the nucleotide sequence only in certain host cells (e.g., tissue-specific regulatory sequences). It will be appreciated by those skilled in the art that the design of the expression vector can depend on such factors as the choice of the host cell to be transformed, the level of expression of protein desired, and the like.
- the expression vectors of the invention can be introduced into host cells to thereby produce proteins or peptides, including fusion proteins or peptides, encoded by nucleic acids as described herein.
- yeast S. cerevisiae examples include pYepSecl (Baldari et al, 1987, EMBO J. 6:229-234), pMFa (Kurjan and Herskowitz, 1982, Cell 30:933-943), pJRY88 (Schultz et al, 1987, Gene 54:113-123), pYES2 (Invitrogen Corporation, San Diego, CA), and pPicZ (Invitrogen Corp, San Diego, CA).
- Baculovirus vectors available for expression of proteins in cultured insect cells include the pAc series (Smith et al, 1983, MoI. Cell Biol. 3:2156-2165) and the pVL series (Lucklow and Summers, 1989, Virology 170:31 -39).
- mammalian expression vectors examples include pCDM8 (Seed, 1987, Nature 329:840), pMT2PC (Kaufman et al, 1987, EMBOJ. 6:187-195), pCDNA3.
- the expression vector's control functions are often provided by viral regulatory elements.
- commonly used promoters are derived from polyoma, Adenovirus 2, cytomegalovirus and Simian Virus 40.
- suitable expression systems for eukaryotic cells see chapters 16 and 17 of Sambrook et al, supra.
- the activity of the compounds of the invention as described herein to modulate one or more gated ion channel activies can be assayed in an animal model to determine the efficacy, toxicity, or side effects of treatment with such an agent.
- a gated ion channel modulator e.g., a compound of the invention
- an agent identified as described herein can be used in an animal model to determine the mechanism of action of such an agent.
- Animal models for determining the ability of a compound of the invention to modulate a gated ion channel biological activity are well known and readily available to the skilled artisan.
- Examples of animal models for pain and inflammation include, but are not limited to the models listed in Table 5.
- Animal models for investigating neurological disorders include, but are not limited to, those described in Morris et al. , (Learn. Motiv. 1981; 12: 239-60) and Abeliovitch et al, Cell 1993; 75: 1263-71).
- An example of an animal model for investigating mental and behavioral disorders is the Geller-Seifter paradigm, as described in Psychopharmacology (Berl). 1979 Apr 11;62(2):117-21.
- Genitourinary models include methods for reducing the bladder capacity of test animals by infusing either protamine sulfate and potassium chloride (See, Chuang, Y. C. et al, Urology 61(3): 664-670 (2003)) or dilute acetic acid (See, Sasaki, K. et al, J. Urol. 168(3): 1259-1264 (2002)) into the bladder.
- protamine sulfate and potassium chloride See, Chuang, Y. C. et al, Urology 61(3): 664-670 (2003)
- dilute acetic acid See, Sasaki, K. et al, J. Urol. 168(3): 1259-1264 (2002)
- Efficacy for treating spinal cord injured patients can be tested using methods as described in Yoshiyama et al. (1999) Urology 54: 929-33.
- Gastrointestinal models can be found in: Gawad, K. A., et al, Ambulatory long- term pH monitoring in pigs, Surg Endosc, (2003); Johnson, S. E. et al, Esophageal Acid Clearance Test in Healthy Dogs, Can. J. Vet. Res. 53(2): 244-7 (1989); and Cicente, Y. et al, Esophageal Acid Clearance: More Volume-dependent Than Motility Dependent in Healthy Piglets, J. Pediatr. Gastroenterol. Nutr. 35(2): 173-9 (2002). Models for a variety of assays can be used to assess visceromotor and pain responses to rectal distension. See, for example, Gunter et al , Physiol. Behav., 69(3): 379-82 (2000),
- Gastrointestinal motility can be assessed based on either the in vivo recording of mechanical or electrical events associated intestinal muscle contractions in whole animals or the activity of isolated gastrointestinal intestinal muscle preparations recorded in vitro in organ baths (see, for example, Yaun et al, Br. J. Pharmacol., 112(4): 1095-1100 (1994), Jin et al, J. Pharm. Exp. Ther., 288(1): 93-97 (1999) and Venkova et al , J. Pharm. Exp. Ther., 300(3): 1046-1052 (2002)). Tatersall et al.
- the compounds can also be assayed in non-human transgenic animals containing exogenous sequences encoding one or more gated ion channels.
- a "transgenic animal” is a non-human animal, preferably a mammal, more preferably a rodent such as a rat or mouse, in which one or more of the cells of the animal includes a transgene.
- Other examples of transgenic animals include non-human primates, sheep, dogs, cows, goats, chickens, amphibians, etc.
- Methods for generating transgenic animals via embryo manipulation and microinjection, particularly animals such as mice have become conventional in the art and are described, for example, in U.S. Patent Nos. 4,736,866 and 4,870,009, U.S. Patent No. 4,873,191 and in Hogan, Manipulating the Mouse Embryo, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N. Y., 1986. Similar methods are used for production of other transgenic animals.
- a homologous recombinant animal can also be used to assay the compounds of the invention.
- Such animals can be generated according to well known techniques (see, e.g., Thomas and Capecchi, 1987, Cell 51:503; Li et al, 1992, Cell 69:915; Bradley, Teratocarcinomas and Embryonic Stem Cells: A Practical Approach, Robertson, Ed., IRL, Oxford, 1987, pp. 113-152;Bradley (1991) Current Opinion in Bio/Technology 2:823-829 and in PCT Publication NOS. WO 90/11354, WO 91/01140, WO 92/0968, and WO 93/04169).
- transgenic non-human animals can be produced which contain selected systems which allow for regulated expression of the transgene (see, e.g., Lakso et al. (1992) Proc. Natl. Acad. Sci. USA 89:6232-6236).
- Another example of a recombinase system is the FLP recombinase system of Saccharomyces cerevisiae (O'Gorman et ⁇ /., 1991, Science 251:1351-1355).
- the compounds of the present invention modulate gated ion channel-associated diseases, disorders and conditions and are therefore useful as treatments for neurological diseases, disorders and conditions as described above.
- the compounds of the present invention are also useful for the treatment of pain.
- a "gated ion channel modulator” refers to a compound that modulates, inhibits, promotes or otherwise alters the responsiveness of gated ion channels to, for example, variations of voltage, temperature, pH, intra- and extracellular ligand concentrations, intra- and extracellular ion concentrations, and/or mechanical stimulation.
- an "ASICIa modulator” refers to a compound that modulates, e.g., inhibits, promotes, or otherwise alters, an activity of a gated ion channel, e.g., an ASICIa gated ion channel.
- Gated ion channel-mediated activity is a biological activity that is normally modulated (e.g., promoted), either directly or indirectly, in the presence of a gated ion channel (e.g. , an ASIC).
- a biological activity that is mediated by a particular gated ion channel, e.g. ASICIa, is referred to herein by reference to that gated ion channel, e.g. ASIC la-mediated activity.
- the present invention provides for both therapeutic methods of treating a subject at risk of (or susceptible to) a disease, disorder or condition or having a disease, disorder or condition associated with the activity of gated ion channels, e.g. inflammatory pain, acute pain, chronic malignant pain, chronic nonmalignant pain, neuropathic pain and migraine, and neurological, neurodegenerative or neuropsychiatric disorders. Accordingly, the present invention provides methods to treat a subject, e.g., a. mammalian subject, e.g., a. human, that would benefit from the modulation of an activity of a gated ion channel.
- a subject e.g., a. mammalian subject, e.g., a. human
- the invention provides a method of treating a disease, disorder or condition mediated by a gated ion channel activity in a subject.
- the method comprises the step of administering to the subject a therapeutically effective amount of a gated ion channel modulator.
- the disease, disorder or condition to be treated can be any disease, disorder or condition which is modulated, at least in part, directly or indirectly, by interaction of a compound of the invention with gated ion channels, which would in turn diminish or alleviate at least one symptom associated with or caused by the gated ion channel-mediated activity being treated.
- treatment can be diminishment of one or several symptoms of a disorder or complete eradication of a disorder.
- the invention provides a method for the treatment, prevention or alleviation of at least one symptom of a disease, disorder or condition in a subject, e.g., a mammalian subject, e.g., a human, wherein the disease, disorder or condition is associated with modulation of extracellular pH and comprises administering a therapeutically effective amount of a compound of the invention to the subject.
- a subject e.g., a mammalian subject, e.g., a human
- the disease, disorder or condition is associated with modulation of extracellular pH and comprises administering a therapeutically effective amount of a compound of the invention to the subject.
- the invention provides a method for the treatment, prevention or alleviation of at least one symptom of a disease, disorder or condition in a subject, e.g., a mammalian subject, e.g., a human, wherein the disease, disorder or condition is associated with modulation of extracellular calcium and comprises administering a therapeutically effective amount of a compound of the invention to the subject.
- the invention provides a method for the treatment, prevention or alleviation of pain in a subject, e.g., a mammalian subject, e.g., a human, comprising administering a therapeutically effective amount of a compound of the invention to the subject.
- a method for the treatment, prevention or alleviation of at least one symptom of a neurological disease, disorder or condition in a subject comprising administering a therapeutically effective amount of a compound of the invention to the subject, is provided.
- treated is defined as the application or administration of a therapeutic agent to a patient, or application or administration of a therapeutic agent to an isolated tissue or cell line from a patient, who has a disease, disorder or condition, a symptom of a disease, disorder or condition or a predisposition toward a disease, disorder or condition, with the purpose of preventing, curing, healing, alleviating, relieving, altering, remedying, ameliorating, improving or affecting the disease or disorder, the symptoms of disease or disorder or the predisposition toward a disease or disorder .
- subject is intended to include animals, which are capable of suffering from or afflicted with a gated ion channel-associated state or gated ion channel associated disease, disorder, or condition, or any disease, disorder, or condition involving, directly or indirectly, gated ion channel activity.
- subjects include mammals, e.g., humans, dogs, cows, horses, pigs, sheep, goats, cats, mice, rabbits, rats, and transgenic non-human animals.
- the subject is a human, e.g., a human suffering from, at risk of suffering from, or potentially capable of suffering from a gated ion channel-associated state or gated ion channel-associated disease, disorder, or condition.
- gated ion channel-associated diseases, disorders and conditions include, but are not limited to, pain (e.g. , inflammatory pain, acute pain, chronic malignant pain, chronic nonmalignant pain, visceral pain, neuropathic pain and migraine), inflammatory disorders and neurological disorders (e.g., neurodegenerative or neuropsychiatric disorders).
- pain e.g. , inflammatory pain, acute pain, chronic malignant pain, chronic nonmalignant pain, visceral pain, neuropathic pain and migraine
- inflammatory disorders and neurological disorders e.g., neurodegenerative or neuropsychiatric disorders.
- Pain refers to a sensation of discomfort that can be described as "unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage” (as defined by the International Association for the Study of Pain (IASP)). Pain can range from mild, localized discomfort to agony and results from the stimulation (e.g, via ASIC activity) of specialized nociceptive neurons. Pain is generally associated with tissue damage or inflammation. "Nociception” is the activity by which the nervous system detects noxious, i.e. potentially tissue-damaging, stimuli (also referred to as physiological pain).
- Pain can be subdivided into nociceptive pain (defined as pain caused by damage to tissues and characterized by the ongoing activity of A ⁇ and C-nociceptors) and neuropathic pain (defined as pain caused by the aberrant signal processing in the nervous system due to nervous system injury, damage or impairment). Pain can be further grouped into three categories based on the anatomical localization, including cutaneous pain, somatic (or deep somatic) pain and visceral pain. (It is recognized that certain disorders are associated with more than one category of pain.)
- Cutaneous pain is caused by injury to the skin or superficial tissues. Cutaneous nociceptors terminate just below the skin, and due to the high concentration of nerve endings, produce a well-defined, localized pain of short duration. Examples of injuries that produce cutaneous pain include, but are not limited to, cuts, burns and lacerations, as well as traumatic injury and post-operative or surgical pain(e.g., at the site of incision).
- somatic pain originates from injury, inflammation or disease of the ligaments, tendons, bones, blood vessels, and nerves themselves, and is detected with somatic nociceptors.
- the scarcity of pain receptors in these areas produces a dull, poorly- localized pain of longer duration than cutaneous pain.
- somatic pain include, but are not limited to, sprains, broken bones, arthralgia, vasculitis, myalgia and myofascial pain.
- Arthralgia refers to pain caused by a joint that has been injured (such as a contusion, break or dislocation) and/or inflamed (e.g., arthritis).
- Vaculitis refers to inflammation of blood vessels with pain.
- Myalgia refers to pain originating from the muscles.
- Myofascial pain refers to pain stemming from injury or inflammation of the fascia and/or muscles. Somatic pain may also be associated with diseases or disorders of the ligaments, tendons, bones, blood vessels and nerves, including, but not limited to, disorders of the musculoskeletal system and connective tissues, and disorders of the circulatory system, "Visceral" pain is associated with injury, inflammation or disease of the body organs and internal cavities. Disorders that are associated with visceral pain include, but are not limited, to disorders of the circulatory system, respiratory system, gastrointestinal system, genitourinary system, immune system, as well as ear, nose and throat.
- Visceral pain can also be associated with infectious and parasitic diseases that affect the body organs and tissues.
- the even greater scarcity of nociceptors in body organs and cavities produces a pain usually more aching and of a longer duration than somatic pain.
- Visceral pain is extremely difficult to localize, and several injuries to visceral tissue exhibit "referred" pain, where the sensation is localized to an area completely unrelated to the site of injury.
- myocardial ischaemia the loss of blood flow to a part of the heart muscle tissue
- Phantom limb pain is the sensation of pain from a limb that one no longer has or no longer gets physical signals from - an experience almost universally reported by amputees and quadriplegics.
- Neuroneuralgia Neuronalgia
- nerve tissue can be irritated, trapped, pinched, severed or inflamed (neuritis). This can disrupt the ability of the sensory nerves to transmit correct information to the thalamus, and hence the brain interprets painful stimuli even though there is no obvious or documented physiologic cause for the pain.
- Disorders of the nerve tissue include, but are not limited to, disorders of the nervous system.
- acute pain is defined as short- term pain or pain with an easily identifiable cause. It is often fast and sharp and centralized to one area followed by aching pain that can be spread out.
- Chronic pain is defined as constant or intermittent pain that has lasted longer than the expected time of healing, e.g. , at least about 2 weeks, 3 weeks, one month, two months, three months, six months or longer.
- inflammatory disease or disorder includes diseases or disorders which are caused, at least in part, or exacerbated by inflammation, e.g. , increased blood flow, edema, activation of immune cells (e.g., proliferation, cytokine production, or enhanced phagocytosis).
- Inflammatory disorders are generally characterized by heat, redness, swelling, pain and loss of function. The cause of inflammation may be due to physical damage, chemical substances, micro-organisms, tissue necrosis, cancer or other agents.
- Inflammatory disorders include acute inflammatory disorders, chronic inflammatory disorders, inflammatory polyarthropathies (e.g., rheumatoid arthritis, juvenile arthritis, polyarthritis, gout), osteoarthritis, rheumatoid arthritis, spondyloarthropathies and recurrent inflammatory disorders.
- Acute inflammatory disorders are generally of relatively short duration, and last for from about a few minutes to about one to two days, although they may last several weeks.
- the main characteristics of acute inflammatory disorders include increased blood flow, exudation of fluid and plasma proteins (edema) and emigration of leukocytes, such as neutrophils.
- Chronic inflammatory disorders generally, are of longer duration, e.g., weeks to months to years or longer, and are associated histologically with the presence of lymphocytes and macrophages and with proliferation of blood vessels and connective tissue.
- Recurrent inflammatory disorders include disorders which recur after a period of time or which have periodic episodes. Some disorders may fall within one or more categories.
- Inflammatory disorders that may be treated according to the methods of the invention include, but are not limited to, inflammation of the nervous system, circulatory system, respiratory system, musculoskeletal and connective tissue system, gastrointestinal system, genitourinary system, eye and adnexa, ear, nose and throat, and endocrine system.
- causes of inflammatory disorders include, but are not limited to, microbial infections (e.g., bacterial, viral and fungal infections), physical agents ⁇ e.g., burns, radiation, and trauma), chemical agents (e.g., toxins and caustic substances), tissue necrosis and various types of immunologic reactions.
- neurodegenerative disorder and “neuropsychiatric disorder” can be used interchangeably herein and refer to disorders and states (e.g., a disease state) that are also associated with gated ion channel- associated diseases, disorders and conditions.
- a neurological disorder can be associated with inappropriate sympathetic or parasympathetic nerve function.
- neurological states that may be treated according to the methods of the invention include, but are not limited to schizophrenia, biopolar disorder, depression, Alzheimer's disease, epilepsy, cancer, musculoskeletal diseases, multiple sclerosis, amyotrophic lateral sclerosis, stroke, addiction, cerebral ischemia, cardiac disease (e.g., cardiac arrhythmia), neuropathy (e.g., anticancer-agent-intoxicated neuropathy, diabetic neuropathy), retinal pigment degeneration, glaucoma, Huntingdon's chorea, and Parkinson's disease.
- cardiac disease e.g., cardiac arrhythmia
- neuropathy e.g., anticancer-agent-intoxicated neuropathy, diabetic neuropathy
- retinal pigment degeneration glaucoma
- Huntingdon's chorea Huntingdon's chorea
- Parkinson's disease e.g., Parkinson's disease.
- neuropathy is defined as a failure of the nerves that carry information to and from the brain and spinal cord resulting in one or more of pain, loss of sensation, loss of function, and inability to control muscles. In some cases, the failure of nerves that control blood vessels, intestines, and other organs results in abnormal blood pressure, digestion problems, and loss of other basic body processes. Peripheral neuropathy may involve damage to a single nerve or nerve group (mononeuropathy) or may affect multiple nerves (polyneuropathy).
- the above compounds can be used for administration to a subject for the modulation of a gated ion channel-mediated activity, including, but not limited to pain, inflammatory and neurological disorders, including disorders and states (e.g., a disease state) that are associated with gated ion channel-mediated activity, including, but not limited to, abnormal neuron growth, abnormal neuron proliferation or abnormal neuron function, abnormal neurotransmission and/or any abnormal function of cells, organs, or physiological systems that are modulated, at least in part, by a gated ion channel- mediated activity.
- a gated ion channel-mediated activity including, but not limited to pain, inflammatory and neurological disorders, including disorders and states (e.g., a disease state) that are associated with gated ion channel-mediated activity, including, but not limited to, abnormal neuron growth, abnormal neuron proliferation or abnormal neuron function, abnormal neurotransmission and/or any abnormal function of cells, organs, or physiological systems that are modulated, at least in part, by a gated ion channel-
- the compounds of the invention may be used to treat pain, and it is understood that the compounds may also alleviate or treat one or more additional symptoms of a disease or disorder discussed herein, e.g., inflammatory and/or neurological disorder.
- pain examples include, but are not limited to pain associated with injury, trauma, cutaneous pain, somatic pain, visceral pain, neuropathic pain, nociceptive pain, acute pain, chronic malignant pain, chronic nonmalignant pain, post-operative pain, cancer pain and inflammatory pain. ⁇
- cutaneous pain examples include, but are not limited to pain related to cuts, burns, lacerations, punctures, incisions, surgical pain, post-operative pain, including orodental surgery, and pain associated with inflammation and infection.
- somatic pain examples include, but are not limited to arthralgia, myalgia, myofascial pain syndrome, chronic lower back pain, cancer-associated pain, phantom limb pain, central pain, bone injury pain, dental pain, fibromyalgia syndrome, meralgia paraesthetica, fibrocitis, idiopathic pain disorder, atypical odontalgia, loin pain, non- cardiac chest pain, chronic nonspecific pain, musculoskeletal pain disorder, chronic pelvic pain, and pain during labor and delivery, post-operative pain, cluster headaches, surgical pain, pain resulting from severe, for example third degree, burns, post partum pain, postmastectomy pain syndrome, stump pain, referred pain, reflex sympathetic dystrophy, and causalgia.
- somatic pain further include, but are not limited to, pain related to injuries, diseases or disorders associated with the musculoskeletal system and connective tissues.
- musculoskeletal system and connective tissue injuries and disorders include, sprains, broken bones, arthropathies (e.g., various forms of arthritis, rheumatoid arthritis, osteoarthritis, spondyloarthropathies and gout), dorsopathies (e.g., various forms of scoliosis, kyphosis, lordosis, osteochondrosis, spondylolysis, subluxation, and torticollis), myositis and diseases of the muscles (e.g., infective myositis, interstitial myositis, calcification and ossification of muscle, diastasis of muscle, ischaemic infarction of muscle, and muscle strain), osteopathies and chondropathies (e.g., various forms of osteop
- somatic pain include, but are not limited to, pain related to injuries, diseases or disorders associated with the circulatory system.
- circulatory system injuries and disorders include, but are not limited to, acute and chronic rheumatic heart diseases, myocardial infarction, hypertension and hypotension, rheumatic fever, pulmonary embolism, cerebrovascular diseases (e.g., stroke), atherosclerosis, peripheral vascular disease (e.g., intermittent claudication), hypertensive diseases, ischaemic heart diseases, including angina pectoris, acute myocardial infarction, coronary thrombosis, coronary insufficiency, mitral insufficiency, hypertrophic cardiomyopathy, ventricular cardiac arrhythmia (e.g., sustained ventricular tachydardia, non-sustained ventricular tachycardia, ventricular fibrillation, ventricular premature beats and ventricular flutter), and atrial tachyarrhythmia (e.g., atrial fibrillation
- disorders of the respiratory system associated with visceral pain include, but are not limited to acute and chronic upper respiratory infections (e.g., various forms or manifestations of acute or chronic nasopharyngitis, sinusitis, pharyngitis, tonsillitis, laryngitis, tracheitis, laryngotracheitis, rhinitis), cough, influenza, various forms of pneumoniae (e.g., bacterial, viral, parasitic or fungal), acute or chronic lower respiratory infections (e.g.
- acute and chronic upper respiratory infections e.g., various forms or manifestations of acute or chronic nasopharyngitis, sinusitis, pharyngitis, tonsillitis, laryngitis, tracheitis, laryngotracheitis, rhinitis
- influenza e.g., various forms of pneumoniae (e.g., bacterial, viral, parasitic or fungal), acute or chronic lower respiratory infections (e.g.
- bronchiolitis various forms or manifestations of acute or chronic bronchitis, bronchiolitis, tracheobronchitis, emphysema, bronchiectasis, status asthmaticus, asthma and other chronic obstructive pulmonary diseases (COPD), adult respiratory distress syndrome, pulmonary oedema, pyothorax, and diseases of the pleura.
- COPD chronic obstructive pulmonary diseases
- disorders of the gastrointestinal system associated with visceral pain include, but are not limited to, disorders of the tooth (e.g., anodontia, supernumerary teeth, mottled teeth, teething syndrome, embedded and impacted teeth, dental caries, pathological resorption, ankylosis of teeth, hypercementosis, pulpitis, necrosis or degeneration of the pulp, various forms of acute or chronic gingivitis, periodontitis, or periodontal disease, gingival recession); dentofacial anomalies (e.g., manadibular hyper- or hypoplasia, asymmetry of jaw, retrognathism, crossbite, temporomandibular joint disorders), orodental cysts, inflammatory conditions of jaws, diseases of the salivary glands (e.g., sialoadenitis, sialolithiasis, abscess, fistula or mucocele of the salivary gland); diseases of the lip and oral mucosa (e.g., various forms of the
- inguinal, femoral, umbilical, ventral, or diaphragmatic hernia diseases of the intestines including noninfective enteritis and colitis (e.g., various forms and manifestations of Crohn's disease, ulcerative colitis, collagenous colitis, gastroenteritis and colitis due to radiation, toxic, allergic or dietetic gastroenteritis and colitis, as well as various forms of ileitis, jejunitis or sigmoiditis), acute or chronic vascular disorders of the intestine (e.g., fulminant ischaemic colitis, intestinal infarction, chronic ischaemic colitis or enteritis, mesenteric vascular insufficiency, angiodysplasia of colon), paralytic ileus and intestinal obstruction ⁇ e.g., volvulus, gallstone ileus, intestinal occlusion), diverticular disease of intestine with or without perforation and/or abscess ⁇ e.g., diver
- alcoholic liver disease e.g., alcoholic fatty liver, alcoholic hepatitis, alcoholic fibrosis and sclerosis of liver, alcoholic cirrhosis of liver, alcoholic hepatic failure
- various forms and manifestations of acute, subacute or chronic hepatic failure of acute and chronic hepatitis ⁇ e.g., nonspecific reactive hepatitis, autoimmune hepatitis, chronic persistent hepatitis, chronic lobular hepatitis, granulomatous hepatitis, infectious or parasitic hepatitis ⁇ e.g., cytomegaloviral, herpesviral, toxoplasma) of fibrosis and cirrhosis of liver ⁇ e.g..
- hepatic fibrosis and/or sclerosis cardiac sclerosis of liver, primary or secondary biliary cirrhosis, macronodular cirrhosis, cryptogenic cirrhosis), liver necrosis, infarction of liver, hepatic veno-occlusive disease, Budd-Chiari syndrome, portal hypertension, hepatorenal syndrome, focal nodular hyperplasia of liver, hepatoptosis, various forms and manifestations of toxic or idiosyncratic liver disease; disorders of gallbladder, biliary tract and pancreas ⁇ e.g., cholelithiasis, cholecystolithiasis, choledocholithiasis, gallstone or calculus of gallbladder with or without cholecystitis), gallstone or calculus of bile duct (with or without cholecystitis and/or cholangitis), acute or chronic cholecystiti
- pancreatitis ⁇ e.g., acute, subacute or chronic pancreatitis, infectious pancraetitis, haemorrhagic pancreatitis,
- urethritis and urethral syndrome ulcer of urethra, urethral meatitis, urethral stricture, urethral, urethroperineal or urethrorectal fistula, urethral diverticulum, urethral caruncle, prolapsed urethral mucosa, urethritis and urethral disorders in other diseases such as candidal urethritis), urinary tract infection, urinary incontinence (overflow, reflex or urge), stress incontinence, diseases of the male genital organs (e.g., hyperplasia of prostate including adenofibromatous hypertrophy, adenoma, fibroadenoma, fibroma, hypertrophy, myoma), inflammatory diseases of prostate (e.g., acute or chronic prostatitis, abscesses of the prostate, prostatocystitis), calculus of prostate, congestion and haemorrhage of prostate, atrophy of prostate, hydrocele
- fibrocystic or diffuse mastopathy cyst of the breast, fibroadenosis or fibrosclerosis of the breast, inflammatory disorders of the breast (e.g. abscess, carbuncle, acute, subacute or nonpurpuerperal mastitis), hypertrophy, lump in breast, fissure and fistula of nipple, fat necrosis and atrophy of the breast, galactorrhea, mastodynia, induration of breast, galactocele, inflammatory diseases of female pelvis organs (e.g., acute or chronic salpingitis and oophoritis), (abscess of fallopian tubes and/or ovary, pyosalpinx, salpingo-oophoritis, hydrosalpinx), acute and chronic inflammatory diseases of the uterus and cervix (e.g., endomyometritis, metritis, myometritis, pyometra,
- Examples of diseases or disorders associated with neuropathic pain include, but are not limited to, neuralgia (e.g., posttherapeutic neuralgia, postherpetic neuralgia and trigeminal neuralgia), neuropathy (e.g., diabetic neuropathy), neuropathic pain, orofacial neuropathic pain, pain associated with cancer, psychogenic pain, headache (e.g., nonorganic chronic headache, tension-type headache, cluster headache and migraine), conditions associated with chronic cephalic pain, complex regional pain syndrome, nerve trunk pain, somatoform pain disorder, cyclical mastalgia, chronic fatigue syndrome, multiple somatization syndrome, chronic pain disorder, tabes dorsalis, spinal cord injury, central pain, noncardiac chest pain, central post-stroke pain, shingles, and Morton's neuroma.
- neuralgia e.g., posttherapeutic neuralgia, postherpetic neuralgia and trigeminal neuralgia
- neuropathy e.g., diabet
- Inflammatory disorders that may be treated according to the methods of the invention include, but are not limited to, inflammation associated with microbial infections (e.g., bacterial, viral and fungal infections), physical agents (e.g., burns, radiation, and trauma), chemical agents (e.g., toxins and caustic substances), tissue necrosis and various types of immunologic reactions.
- microbial infections e.g., bacterial, viral and fungal infections
- physical agents e.g., burns, radiation, and trauma
- chemical agents e.g., toxins and caustic substances
- tissue necrosis e.g., fibrosis
- inflammatory disorders further include, but are not limited to, disorders of the musculoskeletal and connective tissue system, disorders of the respiratory system, disorders of the circulatory system, disorders of the genitourinary system and disorders of the gastrointestinal system. Inflammatory disorders of these systems include, but are not limited to those exemplified above.
- Exemplary inflammatory disorders include, but are not limited to arthritis (e.g., osteoarthritis, rheumatoid arthritis), acute and chronic infections (bacterial, viral and fungal); acute and chronic bronchitis, sinusitis, and other respiratory infections, including the common cold; acute and chronic asthma; acute and chronic gastroenteritis and colitis; acute and chronic cystitis and urethritis; acute respiratory distress syndrome; cystic fibrosis; acute and chronic dermatitis; acute and chronic conjunctivitis; acute and chronic serositis (pericarditis, peritonitis, synovitis, pleuritis and tendinitis); uremic pericarditis; acute and chronic cholecystis; acute and chronic vaginitis; acute and chronic uveitis; lupus erythematosus, eczema, shingles, psoriasis, hyperalgesia, irritable bowl syndrome, Crohn's disease, multiple sclerosis,
- Neurological disorders that may be treated according to the methods of the invention include, but are not limited to schizophrenia, schizotypal disorders, schizoaffective disorders (e.g., manic type, depressive type, and mixed type), various forms and manifestations of dementia and delirium, delusional disorders, psychotic disorders (e.g., transient acute psychotic disorders, acute polymorphic psychotic disorders with or without symptoms of schizophrenia), bipolar affective disorder, cyclothymia, dysthemia, manic episodes, hypomania, depression, (e.g., mild, moderate and severe depressive episodes, psychotic depression, recurrent depressive disorder with and without psychotic symptoms, atypical depression), Anxiety disorders (e.g., phobic disorders (e.g., agoraphobia, claustrophobia), panic disorders, phobias, anxiety hyteria, generalized anxiety disorder, and neurosis), obsessive-compulsive disorders, acute stress reaction, post-traumatic stress disorder, dissociative disorders (e.g.,
- cranial nerve disorders e.g., Bell's palsy, geniculate ganglionitis, Melkersson's syndrome, clonic hemifacial spasm, facial myokymia, glossopharyngeal neuralgia, polyneuritis cranialis, postzoster neuralgia, and multiple cranial nerve palsies
- nerve root and plexus disorders e.g., thoracic outlet syndrome, neuralgic amyotrophy (e.g., Parsonage- Aldren-Turner syndrome, shoulder-girdle neuritis) and
- the methods of the present invention also include the treatment of a disease, disorder or condition that would benefit from the modulation of a gated ion channel activity in combination with an adjuvant composition, such as for example other pain drugs.
- pain drugs is intended to refer to analgesics, anti- inflammatory agents, anesthetics, corticosteroids, antiepileptics, barbiturates, antidepressants, and marijuana.
- an "analgesic” is an agent that relieves pain without significant impairment of consciousness or sense perception and may result in the reduction of inflammation as do corticosteroids, e.g., an anti-inflammatory agent.
- Analgesics can be subdivided into NSAIDs (non-steroidal-anti-inflammatory agents) narcotic analgesics, and non-narcotic agents.
- NSAIDs can be further subdivided into non-selective COX (cyclooxygenase) inhibitors, and selective COX2 inhibitors.
- Opioid analgesics can be natural, synthetic or semi-synthetic opioid (narcotic) analgesics, and include for example, morphine, codeine, meperidine, propxyphen, oxycodone, hydromorphone, heroine, tranadol, and fentanyl.
- Non-opioid analgesics (non-narcotic) analgesics include, for example, acetaminophen, paracetamol, clonidine, NMDA antagonists, and cannabinoids.
- Non-selective COX inhibitors include, but are not limited to acetylsalicylic acid (ASA), ibuprofen, naproxen, ketoprofen, piroxicam, etodolac, and bromfenac.
- Selective COX2 inhibitors include, but are not limited to celecoxib, valdecoxib, parecoxib, and etoricoxib.
- an "anesthetic” is an agent that interferes with sense perception near the site of administration, a local anesthetic, or result in alteration or loss of consciousness, e.g., systemic anesthetic agents.
- Local anesthetics include but are not limited to lidocaine and buvicaine.
- Non-limiting examples of antiepileptic agents are carbamazepine, phenytoin and gabapentin.
- Non-limiting examples of antidepressants are amitriptyline and desmethylimiprimine.
- the gated ion channel modulators e.g., compounds of the invention, (also referred to herein as "active compounds") of the invention can be incorporated into pharmaceutical compositions suitable for administration.
- Such compositions typically comprise the gated ion channel modulator and a pharmaceutically acceptable carrier.
- pharmaceutically acceptable carrier is intended to include any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents, and the like, compatible with pharmaceutical administration.
- the use of such media and agents for pharmaceutically active substances is well known in the art. Except insofar as any conventional media or agent is incompatible with the active compound, use thereof in the compositions is contemplated. Supplementary active compounds can also be incorporated into the compositions.
- a pharmaceutical composition of the invention is formulated to be compatible with its intended route of administration.
- routes of administration include parenteral, e.g., intravenous, intradermal, subcutaneous, oral (e.g., inhalation), transdermal (topical), transmucosal, and rectal administration.
- Solutions or suspensions used for parenteral, intradermal, or subcutaneous application can include the following components: a sterile diluent such as water for injection, saline solution, fixed oils, polyethylene glycols, glycerine, propylene glycol or other synthetic solvents; antibacterial agents such as benzyl alcohol or methyl parabens; antioxidants such as ascorbic acid or sodium bisulfite; chelating agents such as ethylenediaminetetraacetic acid; buffers such as acetates, citrates or phosphates and agents for the adjustment of tonicity such as sodium chloride or dextrose. pH can be adjusted with acids or bases, such as hydrochloric acid or sodium hydroxide.
- the parenteral preparation can be enclosed in ampoules, disposable syringes or multiple dose vials made of glass or plastic.
- compositions suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion.
- suitable carriers include physiological saline, bacteriostatic water, Cremophor ELTM (BASF, Parsippany, NJ) or phosphate buffered saline (PBS).
- the composition must be sterile and should be fluid to the extent that easy syringability exists. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi.
- the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyetheylene glycol, and the like), and suitable mixtures thereof.
- the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
- Prevention of the action of microorganisms can be achieved by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, ascorbic acid, thimerosal, and the like.
- isotonic agents for example, sugars, polyalcohols such as manitol, sorbitol, sodium chloride in the composition.
- Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, aluminum monostearate and gelatin.
- Sterile injectable solutions can be prepared by incorporating the active compound (e.g., a compound of the invention, e.g., a gated ion channel modulator) in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, followed by filtered sterilization.
- dispersions are prepared by incorporating the active compound into a sterile vehicle which contains a basic dispersion medium and the required other ingredients from those enumerated above.
- sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and freeze-drying which yields a powder of the active ingredient plus any additional desired ingredient from a previously sterile-filtered solution thereof.
- Oral compositions generally include an inert diluent or an edible carrier. They can be enclosed in gelatin capsules or compressed into tablets.
- the active compound can be incorporated with excipients and used in the form of tablets, troches, or capsules.
- Oral compositions can also be prepared using a fluid carrier for use as a mouthwash, wherein the compound in the fluid carrier is applied orally and swished and expectorated or swallowed.
- Pharmaceutically compatible binding agents, and/or adjuvant materials can be included as part of the composition.
- the tablets, pills, capsules, troches and the like can contain any of the following ingredients, or compounds of a similar nature: a binder such as microcrystalline cellulose, gum tragacanth or gelatin; an excipient such as starch or lactose, a disintegrating agent such as alginic acid, Primogel, or corn starch; a lubricant such as magnesium stearate or Sterotes; a glidant such as colloidal silicon dioxide; a sweetening agent such as sucrose or saccharin; or a flavoring agent such as peppermint, methyl salicylate, or orange flavoring.
- a suitable propellant e.g., a gas such as carbon dioxide, or a nebulizer.
- Systemic administration can also be by transmucosal or transdermal means.
- penetrants appropriate to the barrier to be permeated are used in the formulation.
- penetrants are generally known in the art, and include, for example, for transmucosal administration, detergents, bile salts, and fusidic acid derivatives.
- Transmucosal administration can be accomplished through the use of nasal sprays or suppositories.
- the active compounds are formulated into ointments, salves, gels, or creams as generally known in the art.
- the compounds can also be prepared in the form of suppositories (e.g., with conventional suppository bases such as cocoa butter and other glycerides) or retention enemas for rectal delivery.
- the active compounds are prepared with carriers that will protect the compound against rapid elimination from the body, such as a controlled release formulation, including implants and microencapsulated delivery systems.
- Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and polylactic acid. Methods for preparation of such formulations will be apparent to those skilled in the art.
- the materials can also be obtained commercially from Alza Corporation and Nova Pharmaceuticals, Inc.
- Liposomal suspensions can also be used as pharmaceutically acceptable carriers. These can be prepared according to methods known to those skilled in the art, for example, as described in U.S. Patent No. 4,522,811.
- Dosage unit form refers to physically discrete units suited as unitary dosages for the subject to be treated; each unit containing a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier.
- the specification for the dosage unit forms of the invention are dictated by and directly dependent on the unique characteristics of the active compound and the particular therapeutic effect to be achieved, and the limitations inherent in the art of compounding such an active compound for the treatment of individuals.
- Toxicity and therapeutic efficacy of such compounds can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., for determining the LD50 (the dose lethal to 50% of the population) and the ED50 (the dose therapeutically effective in 50% of the population).
- the dose ratio between toxic and therapeutic effects is the therapeutic index and it can be expressed as the ratio LD50/ED50.
- Compounds which exhibit large therapeutic indices are preferred. While compounds that exhibit toxic side effects may be used, care should be taken to design a delivery system that targets such compounds to the site of affected tissue in order to minimize potential damage to uninfected cells and, thereby, reduce side effects.
- the data obtained from the cell culture assays and animal studies can be used in formulating a range of dosage for use in humans.
- the dosage of such compounds lies preferably within a range of circulating concentrations that include the ED50 with little or no toxicity.
- the dosage may vary within this range depending upon the dosage form employed and the route of administration utilized.
- the therapeutically effective dose can be estimated initially from cell culture assays.
- a dose may be formulated in animal models to achieve a circulating plasma concentration range that includes the IC50 (i.e., the concentration of the test compound which achieves a half-maximal inhibition of symptoms) as determined in cell culture.
- IC50 i.e., the concentration of the test compound which achieves a half-maximal inhibition of symptoms
- levels in plasma may be measured, for example, by high performance liquid chromatography.
- a therapeutically effective amount of active compound ranges from about 0.001 to 30 mg/kg body weight, preferably about 0.01 to 25 mg/kg body weight, more preferably about 0.1 to 20 mg/kg body weight, and even more preferably about 1 to 10 mg/kg, 2 to 9 mg/kg, 3 to 8 mg/kg, 4 to 7 mg/kg, or 5 to 6 mg/kg body weight.
- an effective dosage ranges from about 0.001 to 30 mg/kg body weight, preferably about 0.01 to 25 mg/kg body weight, more preferably about 0.1 to 20 mg/kg body weight, and even more preferably about 1 to 10 mg/kg, 2 to 9 mg/kg, 3 to 8 mg/kg, 4 to 7 mg/kg, or 5 to 6 mg/kg body weight.
- treatment of a subject with a therapeutically effective amount of compound of the invention can include a single treatment or, preferably, can include a series of treatments.
- compositions can be included in a container, pack, or dispenser together with instructions for administration.
- This invention is further illustrated by the following Exemplification which should not be construed as limiting. The contents of all references, sequences, Figures, and published patent applications cited throughout this application are hereby incorporated by reference.
- This example describes the in vitro assessment of the activity of the compounds of the present invention.
- Electrophysiological assays in Xenopus laevis oocytes expressing gated ion channels are performed as follows:
- oocytes from adult Xenopus laevis are treated for 2 h at room temperature with 1 mg/ml type I collagenase (Sigma) in Barth solution under constant agitation.
- Selected oocytes at stage IV-V are defolliculated manually before nuclear microinjection of 2.5-5 ng of a suitable expression vector, such as pCDNA3, comprising the nucleotide sequence encoding a gated ion channel subunit protein.
- a suitable expression vector such as pCDNA3
- the oocytes express homomultimeric proton-gated ion channels on their surface.
- one, two, three or more vectors comprising the coding sequences for distinct gated ion channel subunits are co-injected in the oocyte nuclei.
- oocytes express heteromultimeric proton-gated ion channels.
- ASIC2a and/or ASIC3 subunits in pcDNA3 vector are co-injected at a 1 : 1 cDNA ratio.
- gated ion channels are activated by applying an acidic solution (pH ⁇ 7) and currents are recorded in a two electrode voltage-clamp configuration, using an OC-725B amplifier (Warner Instruments).
- This example describes another in vitro assessment of the activity of the compounds of the present invention.
- Another example of an in vitro assessment method consists of using mammalian heterologous expression systems, which are known to the skilled in the art, and include a variety of mammalian cell lines such as COS, HEK, e.g., HEK293and/or CHO, cells. Cell lines are transfected with gated ion channel(s) and used to perform electrophysiology as follows:
- the amplifier used is the EPC-9 (HEKA-electronics, Lambrect, Germany) run by a Macintosh G3 computer via an ITC- 16 interface. Experimental conditions are set with the Pulse-software accompanying the amplifier. Data is low pass filtered and sampled directly to hard-disk at a rate of 3 times the cut-off frequency.
- EPC-9 HEKA-electronics, Lambrect, Germany
- Pipettes are pulled from borosilicate glass using a horizontal electrode puller (Zeitz-Instrumente, Augsburg, Germany).
- the pipette resistances are 2-3 MOhms in the salt solutions used in these experiments.
- the pipette electrode is a chloridized silver wire, and the reference is a silver chloride pellet electrode (In Vivo Metric, Healdsbur ' g, USA) fixed to the experimental chamber. The electrodes are zeroed with the open pipette in the bath just prior to sealing.
- Nomarski optics Cells are continuously superfused with extracellular saline at a rate of 2,5 ml/min. After giga-seal formation, the whole cell configuration is attained by suction. The cells are held at a holding voltage of -60 mV and at the start of each experiment the current is continuously measured for 45 s to ensure a stable baseline. Solutions of low pH ( ⁇ 7) are delivered to the chamber through a custom-made gravity- driven flowpipe, the tip of which is placed approximately 50 ⁇ m from the cell. Application is triggered when the tubing connected to the flowpipe is compressed by a valve controlled by the Pulse-software. Initially, low pH (in general, pH 6.5) is applied for 1 s every 45 s.
- the sample interval during application is 550 ⁇ s.
- the extracellular saline as well as the low-pH solution are switched to solutions containing the compound to be tested.
- the compound is present until responses of a repeatable amplitude are achieved.
- Current amplitudes are measured at the peak of the responses, and effect of the compounds is calculated as the amplitude at compound equilibrium divided by the amplitude of the current evoked by the pulse just before the compound was included.
- salt solutions are used: extracellular solution (mM): NaCl (140), KCl (4), CaC12 (2), MgC12 (4), HEPES (10, pH 7.4); intracellular solution (mM): KCl (120), KOH (31), MgC12 (1.785), EGTA (10), HEPES (10, pH 7.2).
- extracellular solution mM
- KCl 120
- KOH 31
- MgC12 1.785
- EGTA HEPES (10, pH 7.2
- compounds for testing are dissolved in 50% DMSO at 500 fold the highest concentration used.
- Figure 2 demonstrates concentration response relationships between Compound A and ASICIa and ASIC3 that were acquired at pH 6.5, using the patch-clamp procedure described in this example.
- the patch-claim experiments described in this example demonstated that use of pentanoic acid (5-ethyl-l-aza-bicyclo[2.2.2]oct-2-yl)-(6-methoxy-quinolin-4-yl)-methyl ester and 3, 3 -dimethyl-butyric acid (5-ethyl-l-aza-bicyclo[2.2.2]oct-2-yl)-(6-methoxy- quinolin-4-yl)-methyl ester resulted in a larger difference in current between control ASICs and ASICs with l ⁇ M compound compared with pentanoic acid (6-methoxy- quinolin-4-yl)-(5-vinyl-l-aza-bicyclo[2.2.2]oct-2-yl)-methyl ester and 3,3-dimethyl
- This example describes another in vitro assessment of the inhibitory activity of the compounds of the present invention utilizing patch-clamp electrophysiology of sensory neurons.
- Sensory neurons can be isolated and cultured in vitro from different animal species. The most widely used protocols use sensory neurons isolated from neonatal (Eckert, et al. (1997) JNeurosci Methods 77:183-190) and embryonic (Vasko, et al. (1994) JNeurosci 14:4987-4997) rat. Trigeminal and dorsal root ganglion sensory neurons in culture exhibit certain characteristics of sensory neurons in vivo. Electrophysiology is performed as described above in Example 2.
- This example describes the in vivo assessment of the inhibitory activity of the compounds of the present invention.
- a number of well-established models of pain are described in the literature and are known to the skilled in the art (see, for example, Table 5).
- This example describes the use of the Formalin test.
- Rats Male Sprague-Dawley rats (body weight, 180-300 g) are housed together in groups of four animals under standard conditions with unrestricted access to food and water. Rats are housed in the room in which the testing procedure is performed to minimize any stress response to novel environmental cues. All experiments are conducted according to the ethical guidelines for investigations of experimental pain in conscious animals (Zimmerman, 1983). Separate groups of rats are used for the different experiments such that each animal is used on one occasion only. All experiments for a given compound are performed using age matched animals in an attempt to avoid variability between experiments. Prior to initiation of the formalin test, 4 rats are habituated in separate testing cages for 15-20 min.
- the testing cages are constructed from open mesh steel (L29 x Hl 6 x W22 cm), with angled mirrors placed underneath and behind the cages to allow for an unimpeded view of the animals paws. Animals are then given an injection of either compound or vehicle as appropriate for the testing paradigm. After 4-5 min, they are gently restrained and formalin (5%, 50 ml, s.c; Formaldehyde solution minimum 37%, diluted 1:20 in saline) is injected into the plantar surface of the hindpaw using a 27 gauge needle. After injection, each rat is placed back in its testing cage and measurement of flinching behavior is initiated immediately by a skilled observer blinded to drug treatment.
- formalin 5%, 50 ml, s.c; Formaldehyde solution minimum 37%, diluted 1:20 in saline
- ASICIa expressing HEK293 cells are grown in culture medium (DMEM with 10 % FBS), in polystyrene culture flasks (175 mm 2 ) at 37°C in a humidified atmosphere of 5% CO 2 . Confluency of cells should be 80-90% on day of plating. Cells are rinsed with 10 ml of PBS and cells are re-suspended by addition of culture medium and trituration with a 25 ml pipette.
- culture medium DMEM with 10 % FBS
- polystyrene culture flasks (175 mm 2 ) at 37°C in a humidified atmosphere of 5% CO 2 . Confluency of cells should be 80-90% on day of plating.
- Cells are rinsed with 10 ml of PBS and cells are re-suspended by addition of culture medium and trituration with a 25 ml pipette.
- the cells are seeded at a density of approximately 1x10 6 cells/ml (100 ⁇ l/well) in black- walled, clear bottom, 96-well plates pre-treated with 10 mg/1 poly-D-lysin (75 ⁇ l/well for >30 min). Plated cells were allowed to proliferate for 24 h before loading with dye.
- Fluo-4/AM (1 mg, Molecular Probes) is added 912 ⁇ l DMSO.
- the Fluo-4/AM stock solution (1 mM) is diluted with culture medium to a final concentration of 2 ⁇ M.
- the culture medium is aspirated from the wells, and 50 ⁇ l of the Fluo-4/AM loading solution is added to each well.
- the cells are incubated at 37°C for 30 min.
- the loading solution is aspirated and the cells are washed twice with 100 ⁇ l modified FLIPR medium (145 mM NaCl, 5 mM KCl, 5 mM CaCl 2 , 1 mM MgCl 2 , 10 mM HEPES, pH 7.4) to remove extracellular dye.
- 100 ⁇ l modified FLIPR medium is added to each well and the fluorescence is measured in FLIPR. FLIPR settings (ASICIa)
- Second addition 50 ⁇ l test solution at a rate of 30 ⁇ l/sec and a starting height of lOO ⁇ l
- Second addition 50 ⁇ l MES solution (20 mM, 5 mM final concentration) at a rate of 35 ⁇ l/sec and a starting height of 150 ⁇ l.
- Addition plates (compound test plate and MES plate) are placed on the right and left positions in the FLIPR tray, respectively. Cell plates are placed in the middle position and the ASICIa program is effectuated. FLIPR will then take the appropriate measurements in accordance with the interval settings above. Fluorescence obtained after stimulation is corrected for the mean basal fluorescence (in modified FLIPR medium).
- the MES-induced calcium response in the presence of test substance, is expressed relatively to the MES response alone. Test substances that block the MES- induced calcium response by more that 50% (peak value) are re-tested in triplicates. Confirmed hits are picked for further characterization.
- IC50 values the concentration of the test substance which inhibits 50% of the MES-induced calcium response
- the cDNA for ASICIa and ASIC3 can be cloned from rat poly(A) + mRNA and put into expression vectors according to Hesselager et al. (J Biol Chem. 279(12): 11006- 15 2004). All constructs are expressed in CHO-Kl cells (ATCC no. CCL61). CHO-Kl cells are cultured at 37 0 C in a humidified atmosphere of 5% CO 2 and 95% air and passaged twice every week. The cells are maintained in DMEM (10 mM HEPES, 2 mM glutamax) supplemented with 10% fetal bovine serum and 2 mM L-proline (Life Technologies).
- CHO-Kl cells are co-transfected with plasmids containing ASICs and a plasmid encoding enhanced green fluorescent protein (EGFP) using the lipofectamine PLUS transfection kit (Life Technologies) according to the manufacturer's protocol. For each transfection it is attempted to use an amount of DNA that yield whole-cell currents within a reasonable range (0.5 nA — 10 nA), in order to avoid saturation of the patch-clamp amplifier (approximately 50 ng for ASICIa and ASIC3). Electrophysiological measurements are performed 16-48 hours after transfection. The cells are trypsinized and seeded at 3.5 mm glass coverslips, precoated with poly-D- lysine, at the same day as the electrophysiological recordings were performed. TABLE 5
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CA002561993A CA2561993A1 (en) | 2004-03-30 | 2005-03-30 | Compositions and methods for modulating gated ion channels |
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Cited By (14)
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WO2007115410A1 (en) * | 2006-04-10 | 2007-10-18 | Painceptor Pharma Corporation | Compositions and methods for modulating gated ion channels |
WO2008007131A2 (en) * | 2006-07-14 | 2008-01-17 | Medical Research Council | Treatment for demyelinating disease |
WO2012012498A2 (en) | 2010-07-20 | 2012-01-26 | Pulmatrix, Inc. | Use of trp channel agonists to treat infections |
WO2012044736A1 (en) | 2010-09-29 | 2012-04-05 | Pulmatrix, Inc. | Monovalent metal cation dry powders for inhalation |
WO2012050945A1 (en) | 2010-09-29 | 2012-04-19 | Pulmatrix, Inc. | Cationic dry powders |
WO2013052844A1 (en) | 2011-10-07 | 2013-04-11 | Pulmatrix, Inc. | Methods for treating and diagnosing respiratory tract infections |
WO2013130767A1 (en) | 2012-02-29 | 2013-09-06 | Pulmatrix, Inc. | Inhalable dry powders |
WO2015021988A1 (en) * | 2013-08-12 | 2015-02-19 | Aros Pharma Aps | Pyrrolo-isoquinoline compounds for treatment of pain associated with interstitial cystitis/bladder pain syndrome |
US9150648B2 (en) | 2012-01-31 | 2015-10-06 | Regeneron Pharmaceuticals, Inc. | Anti-ASIC1 antibodies and uses thereof |
US9340500B2 (en) | 2011-04-20 | 2016-05-17 | Shionogi & Co., Ltd. | Aromatic heterocyclic derivative having TRPV4-inhibiting activity |
US9371383B2 (en) | 2012-01-31 | 2016-06-21 | Regeneron Pharmaceuticals, Inc. | Anti-ASIC1 antibodies and uses thereof |
US9499533B2 (en) | 2012-03-27 | 2016-11-22 | Shionogi & Co., Ltd. | Aromatic 5-membered heterocyclic derivative having TRPV4-Inhibiting activity |
US9708338B2 (en) | 2013-09-25 | 2017-07-18 | Shionogi & Co., Ltd. | Aromatic heterocyclylamine derivative having TRPV4-inhibiting activity |
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JP2009514535A (en) * | 2005-11-03 | 2009-04-09 | レッドポイント バイオ コーポレイション | High-throughput screening assay for TRPM5 ion channel |
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DK0795334T3 (en) * | 1996-03-12 | 2006-06-06 | Sanofi Aventis Deutschland | New prodrugs for the treatment of tumors and inflammatory diseases |
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TWI326214B (en) * | 2002-07-17 | 2010-06-21 | Avanir Pharmaceuticals Inc | Pharmaceutical compositions comprising dextromethorphan and quinidine for the treatment of neurological disorders |
WO2004093814A2 (en) * | 2003-04-22 | 2004-11-04 | Pharmacia Corporation | Compositions of a cyclooxygenase-2 selective inhibitor and a sodium channel blocker |
FR2861076B1 (en) * | 2003-10-17 | 2006-01-06 | Sanofi Synthelabo | N-HETEROCYCLYMETHYLBENZAMIDE DERIVATIVES, THEIR PREPARATION AND THEIR THERAPEUTIC USE |
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US20070004680A1 (en) | 2007-01-04 |
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