Endocannabinoids mediate anxiolytic-like effect of acetaminophen via CB1 receptors

Acetaminophen (Paracetamol), a most commonly used antipyretic/analgesic agent, is metabolized to AM404 ( N-arachidonoylphenolamine) that inhibits uptake and degradation of anandamide which is reported to mediate the analgesic action of acetaminophen via CB1 receptor. AM404 and anandamide are also re...

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Veröffentlicht in:Progress in neuro-psychopharmacology & biological psychiatry 2009-10, Vol.33 (7), p.1191-1199
Hauptverfasser: Umathe, Sudhir N., Manna, Shyamshree S.S., Utturwar, Kaweri S., Jain, Nishant S.
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container_start_page 1191
container_title Progress in neuro-psychopharmacology & biological psychiatry
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Manna, Shyamshree S.S.
Utturwar, Kaweri S.
Jain, Nishant S.
description Acetaminophen (Paracetamol), a most commonly used antipyretic/analgesic agent, is metabolized to AM404 ( N-arachidonoylphenolamine) that inhibits uptake and degradation of anandamide which is reported to mediate the analgesic action of acetaminophen via CB1 receptor. AM404 and anandamide are also reported to produce anxiolytic-like behavior. In view of the implication of endocannabinoids in the effect of acetaminophen, we contemplated that acetaminophen may have anxiolytic-like effect. Therefore, this possibility was tested by observing the effects of various doses of acetaminophen in mice on anxiety-related indices of Vogel conflict test and social interaction test. The results from both the tests indicated that acetaminophen (50, 100, or 200 mg/kg, i.p.) or anandamide (10 or 20 µg/mouse, i.c.v.) dose dependently elicited anxiolytic-like effect, that was comparable to diazepam (2 mg/kg, i.p.). Moreover, co-administration of sub-effective dose of acetaminophen (25 mg/kg, i.p.) and anandamide (5 µg/mouse, i.c.v) produced similar anxiolytic effect. Further, pre-treatment with AM251 (a CB1 receptor antagonist; 1 mg/kg, i.p.) antagonized the effects of acetaminophen and anandamide with no per se effect at 1 mg/kg dose, while anxiogenic effect was evident at a higher dose (5 mg/kg, i.p.). None of the treatment/s was found to induce any antinociceptive or locomotor impairment effects. In conclusion, the findings suggested that acetaminophen (50, 100, or 200 mg/kg, i.p.) exhibited dose dependent anxiolytic effect in mice and probably involved endocannabinoid-mediated mechanism in its effect.
doi_str_mv 10.1016/j.pnpbp.2009.06.020
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AM404 and anandamide are also reported to produce anxiolytic-like behavior. In view of the implication of endocannabinoids in the effect of acetaminophen, we contemplated that acetaminophen may have anxiolytic-like effect. Therefore, this possibility was tested by observing the effects of various doses of acetaminophen in mice on anxiety-related indices of Vogel conflict test and social interaction test. The results from both the tests indicated that acetaminophen (50, 100, or 200 mg/kg, i.p.) or anandamide (10 or 20 µg/mouse, i.c.v.) dose dependently elicited anxiolytic-like effect, that was comparable to diazepam (2 mg/kg, i.p.). Moreover, co-administration of sub-effective dose of acetaminophen (25 mg/kg, i.p.) and anandamide (5 µg/mouse, i.c.v) produced similar anxiolytic effect. Further, pre-treatment with AM251 (a CB1 receptor antagonist; 1 mg/kg, i.p.) antagonized the effects of acetaminophen and anandamide with no per se effect at 1 mg/kg dose, while anxiogenic effect was evident at a higher dose (5 mg/kg, i.p.). None of the treatment/s was found to induce any antinociceptive or locomotor impairment effects. 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AM404 and anandamide are also reported to produce anxiolytic-like behavior. In view of the implication of endocannabinoids in the effect of acetaminophen, we contemplated that acetaminophen may have anxiolytic-like effect. Therefore, this possibility was tested by observing the effects of various doses of acetaminophen in mice on anxiety-related indices of Vogel conflict test and social interaction test. The results from both the tests indicated that acetaminophen (50, 100, or 200 mg/kg, i.p.) or anandamide (10 or 20 µg/mouse, i.c.v.) dose dependently elicited anxiolytic-like effect, that was comparable to diazepam (2 mg/kg, i.p.). Moreover, co-administration of sub-effective dose of acetaminophen (25 mg/kg, i.p.) and anandamide (5 µg/mouse, i.c.v) produced similar anxiolytic effect. Further, pre-treatment with AM251 (a CB1 receptor antagonist; 1 mg/kg, i.p.) antagonized the effects of acetaminophen and anandamide with no per se effect at 1 mg/kg dose, while anxiogenic effect was evident at a higher dose (5 mg/kg, i.p.). None of the treatment/s was found to induce any antinociceptive or locomotor impairment effects. 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AM404 and anandamide are also reported to produce anxiolytic-like behavior. In view of the implication of endocannabinoids in the effect of acetaminophen, we contemplated that acetaminophen may have anxiolytic-like effect. Therefore, this possibility was tested by observing the effects of various doses of acetaminophen in mice on anxiety-related indices of Vogel conflict test and social interaction test. The results from both the tests indicated that acetaminophen (50, 100, or 200 mg/kg, i.p.) or anandamide (10 or 20 µg/mouse, i.c.v.) dose dependently elicited anxiolytic-like effect, that was comparable to diazepam (2 mg/kg, i.p.). Moreover, co-administration of sub-effective dose of acetaminophen (25 mg/kg, i.p.) and anandamide (5 µg/mouse, i.c.v) produced similar anxiolytic effect. Further, pre-treatment with AM251 (a CB1 receptor antagonist; 1 mg/kg, i.p.) antagonized the effects of acetaminophen and anandamide with no per se effect at 1 mg/kg dose, while anxiogenic effect was evident at a higher dose (5 mg/kg, i.p.). None of the treatment/s was found to induce any antinociceptive or locomotor impairment effects. In conclusion, the findings suggested that acetaminophen (50, 100, or 200 mg/kg, i.p.) exhibited dose dependent anxiolytic effect in mice and probably involved endocannabinoid-mediated mechanism in its effect.</abstract><cop>Amsterdam</cop><pub>Elsevier Inc</pub><pmid>19580839</pmid><doi>10.1016/j.pnpbp.2009.06.020</doi><tpages>9</tpages></addata></record>
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subjects Acetaminophen - administration & dosage
AM404
Anandamide
Animals
Anti-Anxiety Agents - administration & dosage
Anxiety
Anxiety - drug therapy
Arachidonic Acids - pharmacology
Behavior, Animal - drug effects
Biological and medical sciences
Cannabinoid Receptor Modulators - metabolism
Cannabinoid Receptor Modulators - pharmacology
Diazepam - pharmacology
Disease Models, Animal
Dose-Response Relationship, Drug
Drinking - drug effects
Endocannabinoids
Injections, Intraventricular - methods
Interpersonal Relations
Male
Medical sciences
Mice
Motor Activity - drug effects
Neuropharmacology
Paracetamol
Pharmacology. Drug treatments
Piperidines - pharmacokinetics
Polyunsaturated Alkamides - pharmacology
Psycholeptics: tranquillizer, neuroleptic
Psychology. Psychoanalysis. Psychiatry
Psychopharmacology
Pyrazoles - pharmacokinetics
Receptor, Cannabinoid, CB1 - antagonists & inhibitors
Receptor, Cannabinoid, CB1 - metabolism
Social interaction test
Vogel conflict test
title Endocannabinoids mediate anxiolytic-like effect of acetaminophen via CB1 receptors
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