US20010008889A1 - Anticonvulsant containing composition for treating neuropathic pain - Google Patents
Anticonvulsant containing composition for treating neuropathic pain Download PDFInfo
- Publication number
- US20010008889A1 US20010008889A1 US09/780,858 US78085801A US2001008889A1 US 20010008889 A1 US20010008889 A1 US 20010008889A1 US 78085801 A US78085801 A US 78085801A US 2001008889 A1 US2001008889 A1 US 2001008889A1
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- US
- United States
- Prior art keywords
- anticonvulsant
- nmda receptor
- sodium
- nontoxic
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 208000021722 neuropathic pain Diseases 0.000 title claims description 28
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- 239000000901 saccharin and its Na,K and Ca salt Substances 0.000 description 1
- 230000020341 sensory perception of pain Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 229960001462 sodium cyclamate Drugs 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- OTKJDMGTUTTYMP-ZWKOTPCHSA-N sphinganine Chemical compound CCCCCCCCCCCCCCC[C@@H](O)[C@@H](N)CO OTKJDMGTUTTYMP-ZWKOTPCHSA-N 0.000 description 1
- WWUZIQQURGPMPG-KRWOKUGFSA-N sphingosine Chemical compound CCCCCCCCCCCCC\C=C\[C@@H](O)[C@@H](N)CO WWUZIQQURGPMPG-KRWOKUGFSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 229960004793 sucrose Drugs 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 239000000375 suspending agent Substances 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 230000002889 sympathetic effect Effects 0.000 description 1
- 229960002784 thioridazine Drugs 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 239000003029 tricyclic antidepressant agent Substances 0.000 description 1
- 229960002324 trifluoperazine Drugs 0.000 description 1
- ZEWQUBUPAILYHI-UHFFFAOYSA-N trifluoperazine Chemical compound C1CN(C)CCN1CCCN1C2=CC(C(F)(F)F)=CC=C2SC2=CC=CC=C21 ZEWQUBUPAILYHI-UHFFFAOYSA-N 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
- A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/02—Drugs for disorders of the nervous system for peripheral neuropathies
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
Definitions
- This invention relates to a composition and method for alleviating neuropathic pain. More particularly, this invention is directed to a composition and method for alleviating neuropathic pain in which a neuropathic pain-alleviating amount of an anticonvulsant is combined with an anticonvulsant-potentiating amount of a nontoxic antagonist, or blocker, for the N-methyl-D-aspartate (NMDA) receptor or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation.
- NMDA N-methyl-D-aspartate
- Neuropathic pain is pain that is due to functional abnormalities of the nervous system. Fields, “Pain”, McGraw-Hill, Inc. (1987), pp. 133 et seq. There are a variety of possible mechanisms by which nerve dysfunction can cause neuropathic pain: hyperactivity in primary afferent or central nervous system (CNS) nociceptive neurons, loss of central inhibitory connections, and increased activity in sympathetic efferents.
- CNS central nervous system
- Neuropathic pain typically occurs following injury to elements of the nervous system involved in nociception, such as peripheral nerve injury, in which the lesions deafferent the nociceptive pathway, the resultant pain sometimes being referred to deafferentation pain. Neuropathic pain is much more likely to occur with peripheral than with central nervous system damage.
- causes of painful nerve injury are: accidental trauma, tumors, cerval or lumbar spine disease, and surgical procedures. These injuries usually involve one or two peripheral nerves or nerve roots, and the pain is felt in the body region normally innervated by the damaged nerves. Additionally, there are also toxic, metabolic, and hereditary causes of painful polyneuropathies, e.g., alcohol abuse, diabetes mellitus. These tend to be symmetrical and are most severe on the distal limbs.
- a drug composition which comprises a neuropathic pain-alleviating amount of at least one anticonvulsant in combination with an anticonvulsant-potentiating amount of at least one nontoxic antagonist for the NMDA receptor or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation.
- a method of alleviating neuropathic pain comprises administering to a mammal exhibiting neuropathic pain (a) a neuropathic pain-alleviating amount of at least one anticonvulsant and (b) an anticonvulsant-potentiating amount of at least one nontoxic antagonist for the NMDA receptor or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation with (a) being administered prior to, with or following the administration of (b).
- N-methyl-D-aspartate receptor shall be understood to include all of the binding site subcategories associated with the NMDA receptor, e.g., the glycine-binding site, the phenylcyclidine (PCP)-binding site, etc., as well as the NMDA channel.
- the invention herein contemplates the use of nontoxic substances that block an NMDA receptor binding site, e.g., dextrorphan, or the NMDA channel, e.g., a source of magnesium such as magnesium sulfate.
- nontoxic as used herein shall be understood in a relative sense and is intended to designate any substance that has been approved by the United States Food and Drug Administration (“FDA”) for administration to humans or, in keeping with established regulatory criteria and practice, is susceptible to approval by the FDA for administration to humans.
- FDA United States Food and Drug Administration
- nontoxic is also used herein to distinguish the NMDA receptor antagonists, or blockers, that are useful in the practice of the present invention from NMDA receptor antagonists such as MK 801 (the compound 5-methyl-10,11-dihydro-SH-dibenze[a,d] cyclohepten-5,10-imine), CPP (the compound 3-[2-carboxypiperazin-4-yl] propyl-1-phosphonic acid) and PCP (the compound 1-(1-phenylcyclohexyl)piperidine) whose toxicities effectively preclude their therapeutic use.
- MK 801 the compound 5-methyl-10,11-dihydro-SH-dibenze[a,d] cyclohepten-5,10-imine
- CPP the compound 3-[2-carboxypiperazin-4-yl] propyl-1-phosphonic acid
- PCP the compound 1-(1-phenylcyclohexyl)piperidine
- neuroopathic pain-alleviating shall be understood herein to include the expressions “neuropathic pain-suppressing” and “neuropathic pain-inhibiting” as the invention is applicable to the alleviation of existing neuropathic pain as well as the suppression or inhibition of neuropathic pain which would otherwise ensue from an imminent neuropathic pain-causing event.
- any of the pain-alleviating anticonvulsants can be used herein.
- anticonvulsants see, e.g., Goodman and Gilman's “The Pharmaceutical Basis Of Therapeutics”, 8th ed., McGraw-Hill, Inc. (1990), pp. 436-462, and “Remington's Pharmaceutical Sciences”, 17th ed., Mack Publishing Company (1985), pp. 1075-1083.
- neuropathic pain-alleviating anticonvulsants that can be used herein include lamotrigine, gabapentin, valproic acid, topiramate, famotodine, phenobarbital, diphenylhydantoin, phenytoin, mephenytoin, ethotoin, mephobarbital, primidone, carbamazepine, ethosuximide, methsuximide, phensuximide, trimethadione, benzodiazepine, phenacemide, acetazolamide, progabide, clonazepam, divalproex sodium, magnesium sulfate injection, metharbital, paramethadione, phenytoin sodium, valproate sodium, clobazam, sulthiame, dilantin, diphenylan and L-5-hydroxytryptophan.
- nontoxic substances that block the NMDA receptor and as such are useful for potentiating the neuropathic pain-alleviating activity of the anticonvulsant in accordance with this invention are dextromethorphan ((+)-3-hydroxy-N-methylmorphinan), its metabolite dextrorphan ((+)-3-hydroxy-N-methylmorphinan), amantadine (1-amino adamantine), memantine (3,5 dimethylaminoadamantone), their mixtures and their pharmaceutically acceptable salts.
- Other useful nontoxic substances that block the NMDA receptor include pyrroloquinoline quinone and cis-4-(phosphonomethyl)-2-piperidinecarboxylic acid.
- NMDA receptor activation In addition to, or in place of, a blocker for the NMDA receptor, at least one nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation can also be used.
- Activation of the NMDA receptor a subtype of excitatory amino acid receptors, induces a number of changes in the functional activity of nerve cells and, in particular, their capacity for excitability or inhibition in the presence of an addictive substance via an increase in intracellular Ca++ concentration.
- the major consequences of NMDA receptor activation include the following sequences, or cascades, of events occurring within nerve cells:
- Ca++/calmodulin or other Ca++ binding proteins
- Ca++/calmodulin-protein kinase systems such as Ca++/calmodulin kinase II ⁇ autophosphorylation of enzymes (e.g., Ca++/calmodulin kinase II) or other functional proteins ⁇ changes in functional activity;
- a substance that blocks the NMDA receptor will effectively prevent all of the foregoing major intracellular sequences of events from taking place.
- a substance that interferes with translocation and activation of protein kinase C or with calmodulin induced activation of constitutive nitric oxide synthase as well as induction of inducible nitric oxide synthase is also useful for the practice of this invention.
- Nontoxic substances that block a major intracellular consequence of NMDA receptor activation and are therefore useful in the practice of the invention include inhibitors of protein kinase C, e.g., gangliosides such as ganglioside GM I (monosialoganglioside) and ganglioside GT Ib (trisialoganglioside); amphipathic long chain bases such as sphingosine, N,N,N-trimethylsphingosine, sphinganine and psychosine; quinolyloxazole-2-ones such as 4-methyl-5-(3-quinolinyl)-2-(3H)-oxazolone and phenyl-5-(2-quinolinyl)-2-3(3H)-oxazolone; 1,4-bis-(aminohydroxyalkylamino)-anthraquinones such as 1,4-bis-(3-propylamino-2-hydroxypropylamino)-9,10 anth
- Additional nontoxic substances that block a major intracellular consequence of NMDA receptor activation and as such are useful in the practice of the invention include inhibitors of calmodulin such as the phenothiazines, in particular, chlorpromazine, chlorpromazine sulfoxide, prochlorperazine dimaleate, perphenazine, trifluoperazine, fluphenazine, fluphenazine enanthate, fluphenazine decanoate, thioridazine, mesoridazine besylate, piperacetazine, acetophenazine dimaleate, carphenazine dimaleate, butaperazine dimaleate and phenothiazine sulfoxide; naphthalenesulfonamides such as N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide, N-(6-aminohexyl)-5-chloro-2
- NMDA-receptor antagonists are preferred and of these, dextromethorphan is especially preferred due to its wide use in over-the-counter medications where it functions as a cough suppressant.
- the anticonvulsant must be present in a neuropathic pain-alleviating amount, e.g., at a level corresponding to the generally recommended adult human dosages for a particular anticonvulsant, and the NMDA receptor blocker or substance that blocks a major intracellular consequence of NMDA activation must be present at a level that potentiates the neuropathic pain-alleviating effectiveness of the anticonvulsant.
- NMDA receptor blocker or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation need not be administered together, they must both be present in the patient at effective levels at the same time. While it is within the scope of the invention to separately administer the anticonvulsant and the NMDA receptor blocker or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation, as a matter of convenience, it is preferred that these drugs be coadministered in a single dosage form. All modes of administrations are contemplated, e.g., orally, rectally, parenterally, intranasally and topically.
- a therapeutic composition containing the anticonvulsant and nontoxic NMDA receptor blocker or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation will ordinarily be formulated with one or more pharmaceutically acceptable ingredients in accordance with known and established practice.
- the composition can be formulated as a liquid, powder, elixir, injectable solution, etc.
- Formulations for oral use can be provided as tablets or hard capsules wherein the pharmacologically active ingredients are mixed with an inert solid diluent such as calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredients are mixed with an oleaginous medium, e.g., liquid paraffin or olive oil.
- Aqueous suspensions can include pharmaceutically acceptable excipients such as suspending agents, e.g., sodium carboxymethyl cellulose, methylcellulose, hydroxypropylmethylcellulose, sodium alginate, polyvinylpyrrolidone, gum tragacanth and gum acacia; dispersing or wetting agents such as naturally occurring phosphatide, e.g., lecithin, or condensation products of an alkylene oxide with fatty acids, e.g., polyoxyethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, e.g, heptadecaethylene-oxycetanol, or condensation products of ethylene oxide with partial esters derived from fatty acids and a hexitol, e.g., polyoxyethylene sorbitol monoleate or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol anhydrides, e.g., polyoxyethylene sorbitan monoleate
- the aqueous suspensions can also contain one or more preservatives, e.g., ethyl-or-n-propyl-p-hydroxy benzoate, one or more coloring agents, one or more flavoring agents and one or more sweetening agents, such as sucrose, saccharin or sodium or calcium cyclamate.
- preservatives e.g., ethyl-or-n-propyl-p-hydroxy benzoate
- coloring agents e.g., ethyl-or-n-propyl-p-hydroxy benzoate
- flavoring agents e.g., ethyl-or-n-propyl-p-hydroxy benzoate
- sweetening agents such as sucrose, saccharin or sodium or calcium cyclamate.
- the therapeutic composition herein can optionally contain at least one other pharmacologically active substance e.g., a non-narcotic analgesic such as acetaminophen or a nonsteroidal anti-inflammatory drug (NSAID) such as aspirin, diclofenac, diflusinal, etodolac, fenbufen, fenoprofen, flufenisal, flurbiprofen, ibuprofen, indomethacin, ketoprofen, ketorolac, meclofenamic acid, mefenamic acid, nabumetone, naproxen, oxaprozin, phenylbutazone, piroxicam, sulindac, tolmetin, zomepirac, and the like.
- a non-narcotic analgesic such as acetaminophen or a nonsteroidal anti-inflammatory drug (NSAID)
- NSAID nonsteroidal anti-inflammatory drug
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- Bioinformatics & Cheminformatics (AREA)
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Abstract
Description
- This invention relates to a composition and method for alleviating neuropathic pain. More particularly, this invention is directed to a composition and method for alleviating neuropathic pain in which a neuropathic pain-alleviating amount of an anticonvulsant is combined with an anticonvulsant-potentiating amount of a nontoxic antagonist, or blocker, for the N-methyl-D-aspartate (NMDA) receptor or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation.
- Neuropathic pain is pain that is due to functional abnormalities of the nervous system. Fields, “Pain”, McGraw-Hill, Inc. (1987), pp. 133 et seq. There are a variety of possible mechanisms by which nerve dysfunction can cause neuropathic pain: hyperactivity in primary afferent or central nervous system (CNS) nociceptive neurons, loss of central inhibitory connections, and increased activity in sympathetic efferents. Neuropathic pain typically occurs following injury to elements of the nervous system involved in nociception, such as peripheral nerve injury, in which the lesions deafferent the nociceptive pathway, the resultant pain sometimes being referred to deafferentation pain. Neuropathic pain is much more likely to occur with peripheral than with central nervous system damage. Examples of causes of painful nerve injury are: accidental trauma, tumors, cerval or lumbar spine disease, and surgical procedures. These injuries usually involve one or two peripheral nerves or nerve roots, and the pain is felt in the body region normally innervated by the damaged nerves. Additionally, there are also toxic, metabolic, and hereditary causes of painful polyneuropathies, e.g., alcohol abuse, diabetes mellitus. These tend to be symmetrical and are most severe on the distal limbs.
- In accordance with the present invention, a drug composition is provided which comprises a neuropathic pain-alleviating amount of at least one anticonvulsant in combination with an anticonvulsant-potentiating amount of at least one nontoxic antagonist for the NMDA receptor or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation.
- Further in accordance with the present invention, a method of alleviating neuropathic pain is provided which comprises administering to a mammal exhibiting neuropathic pain (a) a neuropathic pain-alleviating amount of at least one anticonvulsant and (b) an anticonvulsant-potentiating amount of at least one nontoxic antagonist for the NMDA receptor or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation with (a) being administered prior to, with or following the administration of (b).
- The expression “N-methyl-D-aspartate receptor” shall be understood to include all of the binding site subcategories associated with the NMDA receptor, e.g., the glycine-binding site, the phenylcyclidine (PCP)-binding site, etc., as well as the NMDA channel. Thus, the invention herein contemplates the use of nontoxic substances that block an NMDA receptor binding site, e.g., dextrorphan, or the NMDA channel, e.g., a source of magnesium such as magnesium sulfate.
- The term “nontoxic” as used herein shall be understood in a relative sense and is intended to designate any substance that has been approved by the United States Food and Drug Administration (“FDA”) for administration to humans or, in keeping with established regulatory criteria and practice, is susceptible to approval by the FDA for administration to humans. The term “nontoxic” is also used herein to distinguish the NMDA receptor antagonists, or blockers, that are useful in the practice of the present invention from NMDA receptor antagonists such as MK 801 (the compound 5-methyl-10,11-dihydro-SH-dibenze[a,d] cyclohepten-5,10-imine), CPP (the compound 3-[2-carboxypiperazin-4-yl] propyl-1-phosphonic acid) and PCP (the compound 1-(1-phenylcyclohexyl)piperidine) whose toxicities effectively preclude their therapeutic use.
- The expression “neuropathic pain-alleviating” shall be understood herein to include the expressions “neuropathic pain-suppressing” and “neuropathic pain-inhibiting” as the invention is applicable to the alleviation of existing neuropathic pain as well as the suppression or inhibition of neuropathic pain which would otherwise ensue from an imminent neuropathic pain-causing event.
- Any of the pain-alleviating anticonvulsants can be used herein. For extensive listings of anticonvulsants, see, e.g., Goodman and Gilman's “The Pharmaceutical Basis Of Therapeutics”, 8th ed., McGraw-Hill, Inc. (1990), pp. 436-462, and “Remington's Pharmaceutical Sciences”, 17th ed., Mack Publishing Company (1985), pp. 1075-1083. Specific neuropathic pain-alleviating anticonvulsants that can be used herein include lamotrigine, gabapentin, valproic acid, topiramate, famotodine, phenobarbital, diphenylhydantoin, phenytoin, mephenytoin, ethotoin, mephobarbital, primidone, carbamazepine, ethosuximide, methsuximide, phensuximide, trimethadione, benzodiazepine, phenacemide, acetazolamide, progabide, clonazepam, divalproex sodium, magnesium sulfate injection, metharbital, paramethadione, phenytoin sodium, valproate sodium, clobazam, sulthiame, dilantin, diphenylan and L-5-hydroxytryptophan.
- Among the nontoxic substances that block the NMDA receptor and as such are useful for potentiating the neuropathic pain-alleviating activity of the anticonvulsant in accordance with this invention are dextromethorphan ((+)-3-hydroxy-N-methylmorphinan), its metabolite dextrorphan ((+)-3-hydroxy-N-methylmorphinan), amantadine (1-amino adamantine), memantine (3,5 dimethylaminoadamantone), their mixtures and their pharmaceutically acceptable salts. Other useful nontoxic substances that block the NMDA receptor include pyrroloquinoline quinone and cis-4-(phosphonomethyl)-2-piperidinecarboxylic acid.
- In addition to, or in place of, a blocker for the NMDA receptor, at least one nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation can also be used. Activation of the NMDA receptor, a subtype of excitatory amino acid receptors, induces a number of changes in the functional activity of nerve cells and, in particular, their capacity for excitability or inhibition in the presence of an addictive substance via an increase in intracellular Ca++ concentration. The major consequences of NMDA receptor activation include the following sequences, or cascades, of events occurring within nerve cells:
- a) translocation and activation of protein kinases such as protein kinase C → phosphorylation of substrate proteins such as cytosolic enzymes, channel proteins, receptor proteins, etc. → changes in functional activity;
- b) initiation of early gene (c-ƒos, c-jun, ziƒ-268, etc.) expression by either increased intracellular Ca++ or Ca++-activated protein kinases → expression of functional genes responsible for production of cellular enzymes (such as protein kinases), receptor proteins (such as the NMDA receptor), ion channel proteins (such as K+, Na+, Ca++ channels), neuropeptides (such as dynorphin), etc. → changes in functional activity;
- c) Ca++/calmodulin (or other Ca++ binding proteins) induced activation of enzymes and other cellular components → activation of Ca++/calmodulin-protein kinase systems such as Ca++/calmodulin kinase II → autophosphorylation of enzymes (e.g., Ca++/calmodulin kinase II) or other functional proteins → changes in functional activity;
- d) Ca++/calmodulin induced activation of constitutive nitric oxide synthase as well as induction of inducible nitric oxide synthase → production of nitric oxide → i) production of cyclic guanosine monophosphate via activation of guanosine cyclase resulting in activation of protein kinases and early gene expression; ii) direct protein modification such as enzymes, receptor and/or channel proteins; iii) lipid membrane modification and/or nucleic acid modification via scavenge of free radicals; iv) induction of neurotoxicity at higher nitric oxide levels; v) retrograde actions in adjacent neurons or glial cells such as facilitation of glutamate release/NMDA receptor activation and/or inhibition of post-synaptic NMDA receptors → changes in functional activity;
- e) interactions with the cyclic adenosine monophosphate/protein kinase A system, the phospholipase C-inositol triphosphate-Ca++/diacylglycerol-protein kinase system, the phospholipase A2-arachidonic acid/prostanoids/leukotrienes system → changes in functional activity induced by second messenger systems other than NMDA receptor/Ca++/Ca++-calmodulin/protein kinase systems; and,
- f) interactions with other excitatory amino acid receptor subtypes including non-NMDA receptors and metabotropic receptors as well as intracellular events subsequent to the activation of these excitatory amino acid receptor subtypes → changes in functional activity induced by the non-NMDA and metabotropic receptor activation.
- A substance that blocks the NMDA receptor will effectively prevent all of the foregoing major intracellular sequences of events from taking place. However, even with activation of the NMDA receptor, it is still possible to treat neuropathic pain in accordance with this invention by administering the anticonvulsant and a nontoxic substance that blocks at least one of the foregoing major intracellular sequences of events brought about by activation of the NMDA receptor. Thus, e.g., a substance that interferes with translocation and activation of protein kinase C or with calmodulin induced activation of constitutive nitric oxide synthase as well as induction of inducible nitric oxide synthase is also useful for the practice of this invention.
- Nontoxic substances that block a major intracellular consequence of NMDA receptor activation and are therefore useful in the practice of the invention include inhibitors of protein kinase C, e.g., gangliosides such as ganglioside GMI (monosialoganglioside) and ganglioside GTIb (trisialoganglioside); amphipathic long chain bases such as sphingosine, N,N,N-trimethylsphingosine, sphinganine and psychosine; quinolyloxazole-2-ones such as 4-methyl-5-(3-quinolinyl)-2-(3H)-oxazolone and phenyl-5-(2-quinolinyl)-2-3(3H)-oxazolone; 1,4-bis-(aminohydroxyalkylamino)-anthraquinones such as 1,4-bis-(3-propylamino-2-hydroxypropylamino)-9,10 anthracenedione and 1,4-bis-(3-benzylamino-2-hydroxypropylamino)-9,10 anthracenedione; and, mixtures and pharmaceutically acceptable salts of any of the foregoing.
- Additional nontoxic substances that block a major intracellular consequence of NMDA receptor activation and as such are useful in the practice of the invention include inhibitors of calmodulin such as the phenothiazines, in particular, chlorpromazine, chlorpromazine sulfoxide, prochlorperazine dimaleate, perphenazine, trifluoperazine, fluphenazine, fluphenazine enanthate, fluphenazine decanoate, thioridazine, mesoridazine besylate, piperacetazine, acetophenazine dimaleate, carphenazine dimaleate, butaperazine dimaleate and phenothiazine sulfoxide; naphthalenesulfonamides such as N-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide, N-(6-aminohexyl)-5-chloro-2-naphthalenesulfonamide and N-(6-aminohexyl)-5-bromo-2-naphthalenesulfonamide; 4-substituted-4H,6H-pyrrolo[ 1,2-a][4,1] benzoxazepines such as 1,3-dihydro-1-{1-[ (4-methyl-4H,6H-pyrrolo[1,2-a][4,1] benzoxazepin-4-yl)methyl]-4-piperidinyl}-2H-benzimidazol-2-one; benzhydryls such as N-[2](diphenylmethylthioethyl]-2-(trifluoromethyl)benzeneethanamine, N-[2-(bis(4-fluorophenyl)methylthio)ethyl]-2-(trifluoromethyl)benzeneethanamine and N-[2-(bis(4-fluorophenyl)methylthio)ethyl] -3-(trifluoromethyl)benzeneethanamine; tricyclic antidepressant drugs such as imipramine, 2-chloroimipramine and amitriptyline; penfluridol; haloperidol; pimozide; clozapine; calmidazolin; and, mixtures and pharmaceutically acceptable salts of any of the foregoing.
- Of the two groups, the NMDA-receptor antagonists are preferred and of these, dextromethorphan is especially preferred due to its wide use in over-the-counter medications where it functions as a cough suppressant.
- With regard to dosage levels, the anticonvulsant must be present in a neuropathic pain-alleviating amount, e.g., at a level corresponding to the generally recommended adult human dosages for a particular anticonvulsant, and the NMDA receptor blocker or substance that blocks a major intracellular consequence of NMDA activation must be present at a level that potentiates the neuropathic pain-alleviating effectiveness of the anticonvulsant. Specific dosage levels for the anticonvulsants that can be used herein as given, inter alia, in the “Physicians' Desk Reference”, 1996 Edition (Medical Economics Data Production Company, Montvale, N.J.) as well as in other reference works including Goodman and Gilman's “The Pharmaceutical Basis of Therapeutics” and “Remington's Pharmaceutical Sciences” both of which as referred to above. Given the wide variation in dosage level of the anticonvulsant which depends to a large extent on the specific anticonvulsant being administered, there can similarly be a wide variation in the dosage level of the NMDA receptor blocker or substance that blocks a major intracellular consequence of NMDA receptor activation. These amounts can be determined for a particular drug combination in accordance with this invention employing routine experimental testing. In case of the anticonvulsant phenobarbital and the NMDA receptor blocker dextromethorphan, dosages of from 50 to 300 mg/day of the former coadministered with from 30 to 120 mg/day of the latter will usually provide acceptable results.
- While the neuropathic pain-alleviating anticonvulsant and anticonvulsant-potentiating nontoxic NMDA receptor blocker or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation need not be administered together, they must both be present in the patient at effective levels at the same time. While it is within the scope of the invention to separately administer the anticonvulsant and the NMDA receptor blocker or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation, as a matter of convenience, it is preferred that these drugs be coadministered in a single dosage form. All modes of administrations are contemplated, e.g., orally, rectally, parenterally, intranasally and topically.
- A therapeutic composition containing the anticonvulsant and nontoxic NMDA receptor blocker or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation will ordinarily be formulated with one or more pharmaceutically acceptable ingredients in accordance with known and established practice. Thus, the composition can be formulated as a liquid, powder, elixir, injectable solution, etc. Formulations for oral use can be provided as tablets or hard capsules wherein the pharmacologically active ingredients are mixed with an inert solid diluent such as calcium carbonate, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredients are mixed with an oleaginous medium, e.g., liquid paraffin or olive oil.
- Aqueous suspensions can include pharmaceutically acceptable excipients such as suspending agents, e.g., sodium carboxymethyl cellulose, methylcellulose, hydroxypropylmethylcellulose, sodium alginate, polyvinylpyrrolidone, gum tragacanth and gum acacia; dispersing or wetting agents such as naturally occurring phosphatide, e.g., lecithin, or condensation products of an alkylene oxide with fatty acids, e.g., polyoxyethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, e.g, heptadecaethylene-oxycetanol, or condensation products of ethylene oxide with partial esters derived from fatty acids and a hexitol, e.g., polyoxyethylene sorbitol monoleate or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol anhydrides, e.g., polyoxyethylene sorbitan monoleate. The aqueous suspensions can also contain one or more preservatives, e.g., ethyl-or-n-propyl-p-hydroxy benzoate, one or more coloring agents, one or more flavoring agents and one or more sweetening agents, such as sucrose, saccharin or sodium or calcium cyclamate.
- In addition to anticonvulsant and nontoxic NMDA receptor blocker or nontoxic substance that blocks a major intracellular consequence of NMDA receptor activation, the therapeutic composition herein can optionally contain at least one other pharmacologically active substance e.g., a non-narcotic analgesic such as acetaminophen or a nonsteroidal anti-inflammatory drug (NSAID) such as aspirin, diclofenac, diflusinal, etodolac, fenbufen, fenoprofen, flufenisal, flurbiprofen, ibuprofen, indomethacin, ketoprofen, ketorolac, meclofenamic acid, mefenamic acid, nabumetone, naproxen, oxaprozin, phenylbutazone, piroxicam, sulindac, tolmetin, zomepirac, and the like.
Claims (19)
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Also Published As
Publication number | Publication date |
---|---|
WO1998007447A1 (en) | 1998-02-26 |
CA2264182A1 (en) | 1998-02-26 |
EP0942752A1 (en) | 1999-09-22 |
ES2241055T3 (en) | 2005-10-16 |
US6187338B1 (en) | 2001-02-13 |
US6406716B2 (en) | 2002-06-18 |
EP0942752B1 (en) | 2005-04-20 |
DE69733081T2 (en) | 2006-05-11 |
AU4078897A (en) | 1998-03-06 |
ATE293458T1 (en) | 2005-05-15 |
JP2001500121A (en) | 2001-01-09 |
DE69733081D1 (en) | 2005-05-25 |
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