WO2003104250A1 - New compounds for modulating the activity of exchange proteins directly activated by camp (epacs) - Google Patents
New compounds for modulating the activity of exchange proteins directly activated by camp (epacs) Download PDFInfo
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- WO2003104250A1 WO2003104250A1 PCT/EP2003/006120 EP0306120W WO03104250A1 WO 2003104250 A1 WO2003104250 A1 WO 2003104250A1 EP 0306120 W EP0306120 W EP 0306120W WO 03104250 A1 WO03104250 A1 WO 03104250A1
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- methyladenosine
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- cyclic monophosphate
- phenylthio
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- A61K31/7052—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides
- A61K31/706—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom
- A61K31/7064—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom containing condensed or non-condensed pyrimidines
- A61K31/7076—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom containing condensed or non-condensed pyrimidines containing purines, e.g. adenosine, adenylic acid
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- A—HUMAN NECESSITIES
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- C07H19/00—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof
- C07H19/02—Compounds containing a hetero ring sharing one ring hetero atom with a saccharide radical; Nucleosides; Mononucleotides; Anhydro-derivatives thereof sharing nitrogen
- C07H19/04—Heterocyclic radicals containing only nitrogen atoms as ring hetero atom
- C07H19/16—Purine radicals
- C07H19/20—Purine radicals with the saccharide radical esterified by phosphoric or polyphosphoric acids
- C07H19/213—Purine radicals with the saccharide radical esterified by phosphoric or polyphosphoric acids containing cyclic phosphate
Definitions
- the present invention relates to novel compounds for modulating the activity of exchange p_roteins directly activated by cAMP (Epacs) .
- the present invention relates to cAMP analogues that specifically modulate the activity of Epacs.
- the invention further relates to pharmaceutical compositions comprising the novel compounds, and the use of the compounds in the treatment of humans and/or animals.
- Epacs are a family of guanine nucleotide exchange factors for small GTPases of the Ras family. These proteins are activated by direct binding of cAMP. cAMP, the first identified and well studied second messenger
- PKA protein kinase A
- Rapl guanine nucleotide exchange factors directly activated by cAMP [Epacl and Epac2 (also known as cAMP-GEFI and cAMP- GEFII)] (2-4) was identified. These widely-expressed proteins contain a cAMP binding pocket that is very similar to the cAMP binding pocket in the regulatory subunits of PKA, and cAMP is critically required for exchange activity of Epacl and Epac2 towards the small GTPases Rapl and Rap2.
- the object of the present invention is to provide novel compounds which specifically modulate the Epac-Rapl signalling pathway.
- Ri can be independently H, halogen, azido, alkyl, aryl, amido-alkyl, amido-aryl, OH, 0-alkyl, 0-aryl, SH, S- alkyl, S-aryl, SeH, Se-alkyl, Se-aryl, amino, NH-alkyl , NH-aryl , ⁇ -bisalkyl, ⁇ -bisaryl, cycloalkylamino;
- R 2 can be independently H, halogen, azido, O-alkyl, S-alkyl, Se-alkyl, NH-alkyl , ⁇ -bisalkyl, alkyl-carbamoyl, cycloalkylamino, silyl;
- R 3 can be independently H, halogen, OH, azido, amido- alkyl, amido-aryl, O-alkyl, 0-aryl, SH, S-alkyl, S-aryl, amino, H-alkyl, ⁇ H-aryl, ⁇ -bisalkyl, ⁇ -bisaryl, ⁇ H-alkyl- carbamoyl, cycloalkylamino; and wherein
- R 4 is 0(H) or S (H) ;
- R 5 is O(H), S (H) , amino, H, alkyl, O-alkyl, O-aryl, S-alkyl, S-aryl, ⁇ H-alkyl, ⁇ H-aryl, ⁇ -bisalkyl, ⁇ -bisaryl; or R 4 is 0(H), S(H), amino, H, alkyl, O-alkyl, O-aryl, S- alkyl, S-aryl, NH-alkyl, NH-aryl, N-bisalkyl, N-bisaryl ; and
- R s is 0(H) or S (H) ; and pharmaceutically acceptable salts, esters, and/or solvates thereof, with the exception of 2' -deoxyadenosine-3 ' , 5' -cyclic monophosphate; N 6 -monobutyryl-2 ' -deoxyadenosine-3 ' ,5'- cyclic monophosphate; 2 ' -deoxyadenosine-3 ', 5' -cyclic monophosphorothioate; , 2 ' -deoxyadenosine-3 ', 5' -cyclic monophosphoroanilidate; 2' -deoxyadenosine-3' ,5' -cyclic monophosphate methyl triester; 2' -deoxyadenosine-3 ', 5' - cyclic monophosphate ethyl triester; 2' -O-methyladenosine- 3 ',5 '-cyclic monophosphate;
- Epacs differ from PKA in the cAMP binding domain on at least one critical amino acid.
- novel compounds in particular cAMP analogues with a modified 2 ' -O-ribose group, were thus identified and synthesized, such as 8- (4- chlorophenylthio) -2 ' -O-methyladenosine-3 ' ,5' -cyclic monophosphate (8-pCPT-2' -O-Me-cAMP) which specifically bind and modulate Epacs, but not PKA, in vitro. It was found that by using these analogues, such as 8-pCPT-2' -O-Me-cAMP, in vivo, Rapl is activated efficiently, whereas PKA-mediated responses are not induced.
- 8-pCPT-2' -O-Me-cAMP 8-pCPT-2' -O-Me-cAMP
- 8-pCPT-2 ' -O-Me-cAMP affected neither the activation nor the inactivation of extracellular signal- regulated kinase (ERK) . Instead, it was found that cAMP- induced ERK activation was critically dependent on PKA and Ras, whereas Rapl activity was completely dispensable. These results clearly demonstrate that cAMP-induced Rapl activation and cAMP regulation of ERK are independent processes .
- Ri is H, halogen, azido, O-alkyl, O-aryl, S-alkyl, S- aryl, NH-alkyl, NH-aryl, Se-aryl, more preferably i is H, halogen, azido, O-alkyl, O-aryl, S-alkyl, S- aryl, NH-alkyl, NH-aryl, Se-aryl.
- Ri is H, Br, CI , I, azido, 2-chlorophenylthio, 3- chlorophenylthio, 4-chlorophenylthio, 2-bromophenylthio, 3-bromophenylthio, 4-bromophenylthio, methylamino, methylthio, ethylthio, n-propylthio, n-butylthio, n- pentylthio, n-hexylthio, 2-fluorophenylthio, 3- fluorophenylthio, 4 -fluorophenylthio, 4-methylcumarinyl , naphtyl-2-thio, phenylthio, 4-nitrophenylthio, 2- aminophenylthio, 3-aminophenylthio, 4-aminophenylthio, benzylthio, phenylethylamino, 3 -phenyl-propylamino
- i is H, Br, Cl , azido, 2- chlorophenylthio, 3-chlorophenylthio, 4-chlorophenylthio, 2-bromophenylthio, 3-bromophenylthio, 4-bromophenylthio, methylamino, methylthio, ethylthio, n-propylthio, n- butylthio, n-pentylthio, n-hexylthio, 2 -fluorophenylthio, 3 -fluorophenylthio, 4-fluorophenylthio, 4-methylcumarinyl, naphtyl-2-thio, phenylthio, 4-nitrophenylthio, 2- aminophenylthio, 3-aminophenylthio, 4-aminophenylthio, benzylthio, phenylethylamino, 2-methoxyphenylthio,
- Ri is H, Br, CI , azido, 4-chlorophenylthio, methylamino, methylthio, 4-fluorophenylthio, 4- methylcumarinyl, naphtyl-2-thio, phenylthio, 4- nitrophenylthio, 2-aminophenylthio, benzylthio, n- hexylthio, phenylethylamino, 4-methoxyphenylthio, isopropylthio, benzimidazolyl-2-thio, 2-hydroxyethylthio, ethylthio, 2-aminoethylthio, pyridinylthio, benzothiazolylthio, 4-methylphenylthio, 3- methoxyphenylthio, 4-isopropylphenylthio, 2,3,5,6- tetrafluorophenylthio, 4-hydroxyphenylthio,
- Rl is Cl, Br or S-aryl; preferably Rl is Cl , Br, 4-chlorophenylthio, 4-fluorophenylthio, naphtyl-2- thio, phenylthio, 4-nitrophenylthio, 4-methoxyphenylthio, pyridinyl-2-thio, 4-methylphenylthio, 4- isopropylphenylthio, 2 , 3 , 5, 6-tetrafluoro-phenylthio, 4- hydroxyphenylthio, or 2 , 4-dichloro-phenylthio; and more preferably Rl is 4-chlorophenylthio, 4-fluorophenylthio, 4-methoxyphenylthio, 4-methylphenylthio, 4- hydroxyphenylthio .
- R 2 is H, halogen, azido, O-alkyl, S-alkyl; preferably R 2 is H, Cl, Br, I, 0- alkyl, S-methyl, S-ethyl; more preferably R 2 is H, Cl , Br, O-methyl, O-ethyl, O-propyl, 0-butyl, O-isobutyl, S- methyl; and most preferably R2 is 0-methyl, O-ethyl, O- propyl, O-butyl, O-isobutyl. According to another preferred embodiment of the invention R2 is O-methyl.
- R 3 is preferably amino, NH-alkyl, N-bisalkyl, NH- aryl, NH-alkyl -carbamoyl, N-bisalkyl -carbamoyl , amido- alkyl, amido-aryl, OH; more preferably R 3 is amino, NH- phenyl, NH-tert-butyl, NH-tert-butylcarbamoyl, NH- phenylcarbamoyl , NH-acetyl, NH-propionyl, NH-butyryl, NH- benzoyl, NH-benzyl, NH-phenylethyl , NH-phenylpropyl , N- bismethyl, N-bisethyl, OH; and most preferably R 3 is amino, NH-phenyl, NH-tert-butyl, NH-tert-butylcarbamoyl, NH-phen
- R 3 is amino, NH-phenyl, NH-tert-butyl, NH-tert-butylcarbamoyl, NH-benzoyl, N-bismethyl, OH, preferably R3 is amino, NH- tert-butyl .
- R 4 and R s are independently 0(H) or S (H) , preferably R4 and R5 are 0(H) .
- Preferred compounds of the invention are listed in table 1 and 2.
- the compound is selected from the group consisting of 8-bromo-2 ' -deoxyadenosine-3 ', 5 ' - cyclic monophosphate; 8- (4-chloro-p"henylthio) -2 ' -deoxyadenosine-3 ' , 5 ' -cyclic monophosphate; 8- (4-chloro-phenylthio) - N 6 -phenyl-2 ' - deoxyadenosine-3 ' , 5 ' -cyclic monophosphate; 8-bromo-2 ' -O-methyladenosine-3 ' , 5 ' -cyclic monophosphate; 8- (4-chloro-phenylthio) -2 ' - -
- the present invention also embraces deaza-analogues of the compounds, which refer to analogues of the compounds as defined wherein the purine lacks one or more ring nitrogen atoms, such as, but not limited to 1-deaza-adenine, 3-deaza-adenine, 7-deaza- adenine, dideaza-adenines , and benzimidazole ( Figure 1).
- the deaza-analogue is a compound having the structural formula II:
- R1-R5 are as defined above, and wherein
- R6 and R7 can be independently H, halogen, alkyl, nitro, amino, and/or alkoxy.
- R1-R3 are as defined above;
- R4 and R5 can be independently 0 or S;
- R6 and R7 can be independently F, Cl, Br or I, more preferably R6 and R7 are Cl .
- R2 is 0- alkyl .
- Rl and R3 are hydrogen
- R2 is O-alkyl
- R6 and R7 are Cl .
- the deaza- analogue is selected from the group consisting of 1-deaza- adenine analogues, 3-deaza-adenine analogues, 7-deaza- adenine analogues, 1 , 3-dideaza-adenine analogues, 1,7- dideaza-adenosine analogues and benzimidazole analogues, preferably 5 , 6-dichlorobenzimidazole .
- the invention further relates to the above compounds for modulating the activity of Epacs, and/or for discriminating between the Epac- and PKA-mediated signal transduction pathways, which may be useful, for instance, for research into the function of both pathways in human physiology and pathology.
- modulating refers to any alteration of the activity of Epacs, i.e. both activation and inhibition of Epacs, both in vitro and in vivo.
- the compounds according to the invention thus may have both a (partial) agonistic and a (partial) antagonistic activity.
- the invention relates to pharmaceutical compositions comprising one or more of the compounds of the invention and one or more pharmaceutically acceptable excipients.
- Excipients are substantially inert substances that may be combined with one or more active compounds to facilitate administration of the composition.
- excipients include carriers, diluents, and /or additives and the like.
- R1-R5 are as defined above, as a medicament.
- R1-R7 are as defined above, as a medicament.
- the invention further relates to the use of said compounds for the manufacture of a medicament for the treatment of human diseases, in particular for the treatment of cancer, chronic inflammation, thrombosis, diabetes mellitus, and mental disorders.
- the compounds according to the present invention may further be labelled, according to well-known labeling techniques.
- fluorescent dyes may be coupled to the compounds in order to localize the intracellular distribution of Epac proteins in living cells by means of confocal microscopy, or fluorescence correlation spectrometry with Epac, or fluorescence energy transfer studies with labelled Epac protein, or determination of Epac concentration in living cells.
- the fluorescent dye is preferably coupled, optionally via a spacer, to positions 6 and/or 8, since according to the invention substituents at these positions have been shown to be well excepted.
- a spacer according to this invention refers to, but is not limited to, an aminoalkylamino moiety, or an aminoalkylthio moiety, or a thioalkylthio moiety, or a thioalkylcarboxy moiety, or an aminoalkylcarboxy moiety, or a thioureidoaminoalkylthio moiety, or an amino polyethyleneglycolamino moiety with 1 to 12 ethylene units.
- fluoresecent dyes examples include fluorescein, rhodamine, anthraniloyl , N-ethylanthraniloyl, nitro-benzofurazanyl (NBD) , Texas Red, CyTM3 , CyTM5 , CyTM7 (CyTM-family) , EVOblueTM10, EVOblueTM30, EVOblueTM90, EVOblueTM100 (EVOblueTM-family) , BODIPYTM-family, Alexa FluorTM-family.
- the invention also relates to prodrugs of the compounds as defined above, wherein known functional moieties are coupled the compounds according to the invention, according to well known techniques. It is well known that such structures can enhance membrane- permeability and potency of the mother-compound 10-100 fold.
- the compounds may be transformed into bioactivatable prodrugs.
- bioactivatable protecting groups may be coupled to the cyclic phosphate moiety, leading to significantly increased lipophilicity and bioavailability of the compounds of the invention.
- bioactivatable protection groups of the cyclic phosphate are acetoxymethyl, propionyloxymethyl, butyryloxymethyl, pivaloyloxymethyl, acetoxyethyl, acetoxy butyl , acetoxyisobutyl .
- the compounds according to the present invention may also be transformed into chemically labile prodrugs according to well-known techniques.
- alkyl or aryl groups may be coupled to the cyclic phosphate moiety, leading to significantly increased lipophilicity and bioavailability of the compounds of the invention.
- Examples for chemically labile protection groups of the cyclic phosphate are methyl, ethyl, propyl, benzyl, phenyl .
- Examples of suitable labile prodrugs according to the invention are 8-Br-2 ' -O-Me-cA P-benzyl ester (Example 14; Figure 9A) and 8pCPT-2 ' -O-Me-cAMP-benzyl ester (Example 15; Figure 9B) .
- These compounds per se are inactive, but extremely membrane-permeable, leading to strongly increased intracellular concentrations.
- the mother compounds Upon hydrolysis of the benzyl ester, the mother compounds are released and able to modulate Epac .
- the compounds according to the present invention may also be transformed into photolyzable (so-called caged) compounds according to well-known techniques.
- caged groups may be coupled to the cyclic phosphate moiety, leading to compounds with significantly increased lipophilicity and bioavailability.
- Examples for caged groups of the cyclic phosphate are o-nitro-benzyl , 1- (o- nitrophenyl) -ethylidene, 4 , 5-dimethoxy-2-nitro-benzyl, 7- dimethylamino-coumarin-4-yl , 7-diethylamino-coumarin-4-yl .
- Halogen refers to F, Cl , Br, and I.
- Alkyl refers to an alkyl group, which is a substituted or unsubstituted, linear, branched or cyclic, saturated or unsaturated hydrocarbon moiety with 1 to 20 carbon atoms, with or without heteroatoms, including, but not limited to, methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, pentyl.
- Substituents include, but are not limited to, one or more halogen atoms, haloalkyl groups, (un) substituted aryl groups, (un) substituted heteroaryl groups, amino, nitro, cyano, azido, hydroxy, mercapto, keto, carboxy, methoxy.
- Aryl refers to an aryl group, which is an unsubstituted or substituted aromatic or heteroaromatic hydrocarbon moiety, consisting of one or more aromatic or heteroaromatic rings with 3-8 ringatoms each.
- Substituents include, but are not limited to, one or more halogen atoms, haloalkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstitued heteroaryl groups, amino, nitro, cyano, hydroxy, mercapto, carboxy, azido, methoxy, methylthio.
- O-alkyl refers to an alkyl group, which is bound through an O-linkage, wherein the alkyl group is as defined above.
- 0-aryl refers to an aryl group, which is bound through an 0-linkage, wherein the aryl group is as defined above .
- S-alkyl refers to an alkyl group, which is bound through a S-linkage, wherein the alkyl group is as defined above .
- S-aryl refers to an aryl group, which is bound through a S-linkage, wherein the aryl group is as defined above .
- Se-alkyl refers to an alkyl group, which is bound through a Se-linkage, wherein the alkyl group is as defined above.
- Se-aryl refers to an aryl group, which is bound through a Se-linkage, wherein the aryl group is as defined above .
- NH-alkyl and N-bisalkyl refer to alkyl groups, which are bound through an N linkage, wherein the alkyl groups are as defined above.
- NH-aryl and N-bisaryl refer to aryl groups, which are bound through an N linkage, wherein the aryl groups are as defined above.
- Amido-alkyl refers to an alkyl group, which is bound through a NH-C (0) -alkyl linkage, wherein the alkyl group is as defined above.
- Amido-aryl refers to an aryl group, which is bound through a NH-C (0) -aryl linkage, wherein the aryl group is as defined above.
- Alkyl-carbamoyl refers to an alkyl group, which is boud through a -0-C (0) -NH-alkyl linkage, wherein the alkyl group is as defined above.
- the letter “p” stands for “para” (position 4) in the benzene ring
- “m” stands for “meta” (or position 3) in the benzene ring.
- bonds to ring atoms, and the molecular entities attached to such bonds are termed “axial” or “equatorial” according to whether they are located about the periphery of the ring (“equatorial”), or whether they are orientated above and below the approximate plane of the ring
- both R 4 and R 5 are oxygen, and the double bond is "distributed or dislocated" between both atoms.
- the compound In water at physiological pH, the compound has a negative charge between both oxygens, and a corresponding cation, such as H + or Na + .
- the structural formula is therefore often written with one double bond to oxygen and one single bond to a hydroxyl group, while it is of no importance whether the double bond goes to the axial oxygen (R 4 )' or the equatorial oxygen (R 5 ) . This is indicated by 0(H) and S (H) in the definition of R 4 and R 5 . This means that R 4 and R 5 could be either 0 or S or OH or SH, depending on the location of the double bond.
- Suitable examples of salts of the phosphate moiety of the compounds according to the invention are Li, Na, K, Ca, Mg or NH 4 , and tetra-alkylammonium, trialkylammonium, dialkyammonium, alkylammonium, e.g. tetrabutylammonium, triethylammonium, trimethylammonium, diethylammonium, octylam onium and cetyltrimethylammonium.
- the free acid (H) form of the phosphate moiety is a suitable form for the compounds according to the invention.
- solvates e.g. hydrates
- Methods of solvation are generally known in the art .
- Figure 1 shows some formulas of deaza-analogues of the compounds of the invention.
- Figure 2 demonstrates the alignment of the cAMP- binding domains of PKA, Epac, olfactory channels, pacemaker channels, and the bacterial CAP protein.
- Figure 3 shows the molecular structure of 8-pCPT-2'- 0-Me-cAMP, a preferred compound of the invention.
- FIG 4 shows in vitro activation of Epacl. Rapl loaded with fluorescent Mant-GDP in the presence of a 100- fold excess of GTP was incubated with or without Epacl- ⁇ DEP in the presence of increasing concentrations of either cAMP (left panel) or 8-pCPT-2 ' -O-Me-cAMP (middle panel) ; the right panel shows the in vitro reaction rates of Epac for cAMP and 8-pCPT-2 ' -O-Me-cAMP .
- Figure 5 shows the in vitro PKA activity of either type I holoenzyme (PKAI) or type II holoenzyme (PKAII) at increasing concentrations of either cAMP or 8-pCPT-2'-0- Me-cAMP .
- PKAI type I holoenzyme
- PAII type II holoenzyme
- FIG. 6 shows that 8-pCPT-2 ' -O-Me-cAMP activates Rapl, but not PKA, in vivo.
- Lower panel: NIH3T3-A14 -Epacl cells were treated in duplicate for 15 min with increasing concentrations of 8-pCPT-2 ' -O-Me-cAMP. Cells were lysed and equal amounts of cell lysate were incubated with precoupled GST-RalGDSRBD and Rapl was assayed by immunoblotting with Rapl antibody. Phosphorylation of cAMP responsive element binding protein (CREB) in corresponding cell lysates was analyzed using a phospho-specific CREB antibody.
- CREB cAMP responsive element binding protein
- FIG. 7 shows that 8-pCPT-2 ' -O-Me-cAMP induces cell adhesion via Epac and Rapl.
- A 8-pCPT-2 ' -O-Me-cAMP stimulates cell adhesion.
- Upper panel quantification of 0vcar3 cells adhering to fibronectin after treatment with increasing concentrations of 8-pCPT-2 ' -O-Me-cAMP .
- Lower panel Ovcar3 cells were treated with increasing concentrations of 8-pCPT-2 ' -O-Me-cAMP for 15 min, cells were lysed and analyzed for activation of Rapl (upper blot) and CREB (lower blot) . Total Rapl levels are shown (middle blot).
- B 8-pCPT-2 ' -O-Me-cAMP increases the rate of cell adhesion.
- Upper panel quantification of Ovcar3 cells adhering to fibronectin at various time points.
- Lower panel cells were treated with 60 ⁇ M 8-pCPT-2 ' -O-Me- cAMP for the indicated times.
- Cell lysates were analyzed for activation of Rapl (upper blot) and CREB (lower blot) . Total levels of Rapl in cell lysates are shown (middle blot) .
- 0vcar3 cells were either pre-incubated at 37 °C for 30 min with the PKA inhibitor H-89 (10 ⁇ M) 30 min prior to seeding onto the wells ('Short') or H-89 was added 30 min prior to trypsinization and during the recovery period ('Long') and seeded onto wells in the absence or presence of 8-pCPT-2 ' -O-Me-cAMP (100 ⁇ M) . Cells were allowed to adhere for 1 h. D, cAMP-induced adhesion to fibronectin is blocked by inhibitors of Rapl.
- 0vcar3 cells were transiently transfected with either mock DNA, increasing concentrations of HA-RaplGAP II (0.5, 1, 2 or 6 ⁇ g, respectively), HA-RaplGAPI (6 ⁇ g) or HA-RBD of RalGDS (6 ⁇ g) , respectively.
- Cells were treated with 8-Br-cAMP or 8-pCPT-2 ' -O-Me-cAMP and adhesion to fibronectin was determined.
- Right upper panel luciferase counts of total input cells per well in the above experiment are shown.
- Right lower panel expression of HA-RaplGAPs in the above experiment is shown.
- Figure 8 shows that 8-pCPT-2 ' -O-Me-cAMP induces cell adhesion to fibronectin.
- Upper panel a ⁇ l integrin- blocking peptide containing the RGD sequence present in fibronectin inhibits 8-pCPT-2 ' -O-Me-cAMP-induced cell adhesion.
- Ovcar3 cells were pre-treated for 20 minutes with RGD-peptide (100 ⁇ M) where indicated, and seeded in wells with or without 8-pCPT-2 ' -O-Me-cAMP . Cells were allowed to adhere for 1 h.
- Lower panel: 8-pCPT-2 ' -O-Me- cAMP does not increase the rate of cell adhesion to poly- L-lysine.
- Ovcar3 cells were seeded onto poly-L-lysine- coated plates. At various time points, adherent cells were quantified.
- Figure 9 shows two examples of so-calles prodrug forms of the compounds of the invention.
- the reaction mixture is poured into a solution of 60% acetonitrile/ water and 0.008 M potassium hydroxide, followed by neutralisation with hydrochloric acid and evaporation to dryness.
- the residue is purified by means of column liquid chromatography using silica-based reversed phase material (Merck LiChroprep ® RP-18) . First elution with 100 mM NaH 2 P0 4 is performed, then with 100 % water. Finally, the product is eluted with 2% isopropanol/water . The product containing fractions are collected and evaporated. 671mg (1.51 mmoles) 8-Br-2 ' -O-methyl-cAMP, sodium salt, are isolated with a purity > 98% (yield: 30%) .
- 8-pCPT-2' -O-Me-cAMP 8- (4-Chlorophenylthio) -2' -O-methyladenosine-3' , 5' -cyclic monophosphate
- 8-pCPT-2 ' -O-Me-cAMP was greatly impaired compared to cAMP ( Figure 5) .
- 8-pCPT-2 ' -O-Me- cAMP may also be a very potent compound to discriminate between the Epac and the PKA signalling pathways in vivo. Therefore, 8-CPT-2 ' -O-Me-cAMP was tested in NIH3T3-A14- Epacl cells for the activation of Epac, using Rapl as a read-out, and of PKA, using phosphorylation of the common PKA substrate CREB 29 as a read-out.
- 8-pCPT-2 ' -O-Me-cAMP is a highly specific and efficient activator of Rapl and a very useful tool to discriminate between the PKA mediated and the Epac-Rap mediated signalling pathways.
- 8-pCPT-2 ' -O-Me-cAMP appeared to induce integrin-mediated cell adhesion through Epac and Rapl.
- Cytomegalovirus-luciferase-transfected ovarian carcinoma cells (Ovcar3) , that express the ⁇ l integrin chain involved in binding to fibronectin, were detached with trypsin and allowed to re-express cell surface markers. The cells were seeded onto fibronectin-coated plates in the presence or absence of 8-pCPT-2 ' -O-Me-cAMP and the amount of cells that adhered after a certain period of time was quantified.
- 8-pCPT-2 ' -O-Me-cAMP enhanced cell adhesion to fibronectin and induced Rapl activation at comparable concentrations (EC50 ⁇ 30 ⁇ M;
- Rapl-inhibitory proteins RaplGAPI and Ras-binding domain (RBD) of Ral guanine nucleotide dissociation stimulator (RalGDS) also inhibited adhesion to fibronectin ( Figure 7D, left plot) .
- Transfection of cells with RaplGAPs or RBD of RalGDS did not affect luciferase expression ( Figure 7D, right plot) .
- 8-pCPT-2 ' -O-Me-cAMP-induced cell adhesion is mediated by integrins
- 0vcar3 cells were pre-treated with the ⁇ l-integrin-binding arginine, glycine, aspartic acid (RGD) peptide.
- reaction mixture is stirred under cooling at 0-5 °C until the starting material can no longer be detected by high pressure liquid chromatography (RP-18, 6 % isopropanole/10 mM triethyl ammonium phosphate buffer) .
- high pressure liquid chromatography RP-18, 6 % isopropanole/10 mM triethyl ammonium phosphate buffer
- the reaction mixture is poured into a solution of 60 % acetonitrile/water and 0.008 M potassium hydroxide, followed by neutralisation with hydrochloric acid and evaporation to dryness.
- the residue is purified by means of column liquid chromatography using silica-based reversed phase material (Merck LiChroprep RP-18) . At first elution with 100 mM NaH 2 P0 4 is performed, then with 100 % water.
- Synthesis of 8-pFPT-2 ' -O-Me-cAMP is performed by nucleophilic substitution of 8 -Br-2 ' -O-methyl -cAMP as has already been described principally by Miller et al . (8) .
- 30 ⁇ moles 8-Br-2 ' -O-methyl -cAMP, sodium salt, and 300 ⁇ moles 4-fluorothiophenol were dissolved in 1 mL of 50 % acetonitrile/.water in a 1.5 mL micro tube with screw cap and heated at 95°C until the starting material is completely converted.
- 8- (4-Hydroxy-phenylthio) -2' -O-methyladenosine-3 ' ,5' -cyclic monophosphate 8-pHPT-2' -O-Me-cAMP
- 8-pHPT-2' -O-Me-cAMP 30 ⁇ moles 8-Br- 2' -O-methyl -cAMP, sodium salt, were reacted with 300 ⁇ moles 4-hydroxythiophenol and the product was purified essentially as described in example 4. 16 ⁇ moles 8-pHPT- 2' -O-Me-cAMP, sodium salt, are isolated with a purity of > 97% (yield: 53%) .
- Synthesis is performed as has already been described principally by Genieser et al . (13) . Briefly, 0.9 g (2.5 mmoles) of 8-bromo-2' -O-methyladenosine are dissolved in 20 mL of triethyl phosphate. During gentle stirring, 457 ⁇ L (5 mmoles) of thiophosphoryl chloride are added. The progress of reaction is monitored by high pressure liquid chromatography (RP-18, 6 % isopropanole/10 mM triethyl ammonium phosphate buffer) .
- reaction mixture After disappearance of starting nucleoside, the reaction mixture is poured into a refluxing solution of 60% acetonitrile/ water and 0.008 M potassium hydroxide, followed by neutralisation with hydrochloric acid and evaporation to dryness.
- the residue is purified by means of column liquid chromatography using silica-based reversed phase material (Merck LiChroprep RP-18) . First elution with 100 mM NaH 2 P0 4 is performed, then with 100 % water. Finally, the diastereomers (Rp and Sp) are eluted with a gradient from 0%-5% isopropanol/water.
- the separated diastereomers ' Rp- and Sp-8-Br-2 ' -O-Me-cAMPS are further purified by applying the same chromatographic system as described above. Product containing fractions are collected and evaporated.
- Rp-8-pCPT-2 ' -O-Me-cAMPS 8- (4-Chloro-phenylthio) -2 ' -O-methyladenosine-3 * , 5 ' -cyclic monophosphorothioate, Rp-isomer (Rp-8-pCPT-2 ' -O-Me-cAMPS) Synthesis of Rp-8-pCPT-2 ' -O-Me-cAMPS is performed by nucleophilic substitution of Rp-8-Br-2' -O-methyl-cAMPS as has already been described principally by Miller et al . (8).
- the product precipitates on the flask wall and can be collected by dissolution with methanol and subsequent evaporation of solvent to yield 5 ⁇ moles of 6-DTB-8-pCPT- 2 ' -O-Me-cAMP, sodium salt, wich are isolated with a purity of 96,5% (yield: 7%) .
- the raw product is evaporated until a small liquid rest and purified on a semi-preparative reversed phase (RP 8) silica column using the same ion pair chromatography system.
- RP 8 semi-preparative reversed phase
- the product containing fractions are pooled and desalted on reversed phase silica.
- the filtrate is evaporated to dryness in a speed-vac centrifuge under reduced pressure under oil pump vacuum, redissolved in 0.5 mL 50% methanol/water, and purified by means of semi -preparative hplc using silica-based reversed phase material (YMC ODS-A 120-11, RP-18) .
- the product -containing fractions are collected and evaporated.
- 35 ⁇ moles 8-Br-2 ' -O-Me-cAMP-Bn 21 ⁇ moles of axial isomer and 14 ⁇ moles of equatorial isomer
- a purity of > 97% Yield: 37%) .
- Antibodies against phosphorylated CREB were obtained from Cell Signalling (Beverly, MA, USA) , and antibodies against K- Rev/Rapl and polyclonal anti-HA were obtained from Santa Cruz Biotechnology (Santa Cruz, CA, USA) .
- the following inhibitors and stimuli were used at concentrations indicated, unless stated otherwise: RGD peptide (100 ⁇ M) and H-89 (10 ⁇ M) was obtained from Biomol Research Laboratories Inc. (Plymouth Meeting, PA, USA) .
- 8-Br-cAMP (1 mM) was obtained from BIOLOG Life Science Institute (Bremen, Germany) .
- TPA (12-0-tetradecanoylphorbol-13- acetate) was obtained from Sigma (Steinheim, Germany) and was used at a concentration of 100 ng/ml.
- NIH3T3-A14 cells stably expressing Epacl
- NIH-OVCAR3 (Ovcar3) cells were maintained in RPMI with 10% fetal calf serum.
- Transient transfection of Ovcar3 cells was performed using the FuGENE 6 transfection reagent (Roche Diagnostics, Mannheim, Germany) according to the manufacturer's procedures, using 6 ⁇ g total DNA including a CMV-luciferase plasmid (0.2 ⁇ g) .
- Cyclic AMP dependent protein kinase I and I were reconstituted from isolated subunits and assayed for kinase activity using 70 mM kemptide as substrate, as described previously (15) .
- Rap activation assays were performed as described previously (16-18) . Briefly, cells were lysed in lysis buffer containing 10% glycerol, 1% Nonidet P-40, 50 mM Tris-CI pH7.5, 200 mM NaCl, 2mM MgC12, 1 ⁇ M leupeptin, 0.1 ⁇ M aprotinin, 5 mM NaF, 1 mM NaV03. Lysates were clarified by centrifugation and incubated with GST-tagged RalGDS-RBD pre-coupled to glutathione beads to specifically pull down the GTP-bound forms of Rapl. Samples were incubated for 1 hr at 4 °C while tumbling.
- 24-well plates were coated overnight with 2 ⁇ g/ml fibronectin (Sigma, St. Louis, MO, USA) in sodium bicarbonate buffer (Sigma, St. Louis, MO, USA). Poly-L- lysine was coated for 2 hours at room temperature (0.1% w/v in water) , washed twice with water and dried overnight. Plates were washed in TSM buffer (20 mM Tris- HCl pH 8, 150 mM NaCl, 1 mM CaCl 2 , 2 mM MgCl 2 ) and blocked for 30-45 min at 37°C with 1% BSA/TSM.
- TSM buffer (20 mM Tris- HCl pH 8, 150 mM NaCl, 1 mM CaCl 2 , 2 mM MgCl 2
- Transiently transfected Ovcar3 cells serum-starved 16 h prior to the adhesion assay, were detached by trypsinization.
- Cells were centrifuged and resuspended in serum-free RPMI containing 25 mM Hepes, 0.5% BSA and 1 g/L glucose to allow recovery of cell surface markers at 37°C for 1.5-2 h with gentle rotation in suspension.
- Cells were centrifuged, counted and resuspended at 3 x 10 5 cells/ml in serum-free RPMI with 0.5% BSA. The experiment was performed in triplicates, and to each well 150 ⁇ l of cells was added to 150 ⁇ l of medium with or without stimulus.
- H-89 (10 ⁇ M) .
- cells were either preincubated at 37 °C for 30 min with the inhibitor prior to seeding the wells (short pretreatment) or H-89 was added before trypsinization, during the recovery period and before seeding wells (long pretreatment) .
- Cells were allowed to adhere for 1 hour at 37°C and non-adherent cells were removed by gently washing plates 3 times with warmed 0.5% BSA/TSM.
- Adherent cells were lysed in luciferase lysis buffer (15% glycerol, 25 mM Tris-phosphate pH 7.8 , 1% Triton X-100, 8 mM MgCl 2 , 1 mM DTT) at 4°C for 30 min and units of luciferase activity were quantified with addition of equal volume of luciferase assay buffer (25 mM Tris- phosphate pH 7.8, 8 mM MgCl 2 , 1 mM DTT, 1 mM ATP pH 7 , 1 mM luciferin) using a luminometer (Lumat LB9507; Berthold Technologies, Belgium) .
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AU2003242672A AU2003242672B2 (en) | 2002-06-07 | 2003-06-10 | New compounds for modulating the activity of exhange proteins directly activated by camp (EPACS) |
EP03757062.9A EP1511757B1 (en) | 2002-06-07 | 2003-06-10 | New compounds for modulating the activity of exchange proteins directly activated by camp (epacs) |
CA2488611A CA2488611C (en) | 2002-06-07 | 2003-06-10 | Compounds for modulating the activity of exchange proteins directly activated by camp (epacs) |
JP2004511318A JP4902958B2 (en) | 2002-06-07 | 2003-06-10 | Novel compounds for modulating the activity of exchange protein (Epac) directly activated by cAMP |
US10/517,564 US7906491B2 (en) | 2002-06-07 | 2003-06-10 | Compounds for modulating the activity of exchange proteins directly activated by cAMP (Epacs) |
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AU2003242672B2 (en) | 2009-12-17 |
US20060100166A1 (en) | 2006-05-11 |
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CA2488611C (en) | 2011-11-15 |
US7906491B2 (en) | 2011-03-15 |
CA2488611A1 (en) | 2003-12-18 |
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