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Antinociceptive activity of chemical congeners of improgan: optimization of side chain length leads to the discovery of a new, potent, non-opioid analgesic.

Abstract：

:Improgan is a chemical congener of the H2 antagonist cimetidine which shows the profile of a highly effective analgesic when administered directly into the CNS. Although the improgan receptor is unknown, improgan activates analgesic pathways which are independent of opioids, but may utilize cannabinoid mechanisms. To discover selective, potent, improgan-like drugs, seven compounds chemically related to improgan were synthesized and tested for antinociceptive activity in rats after intracerebroventricular (icv) administration. Among a series of improgan congeners in which the alkyl chain length of improgan ((-CH2)3-) was varied, five compounds showed full agonist antinociceptive activity with potencies greater than that of improgan. VUF5420 (containing (-CH2)4-, EC50 = 86.1 nmol) produced maximal antinociceptive activity after doses which showed no motor impairment or other obvious toxicity, and was 2.3-fold more potent than improgan (EC50 = 199.5 nmol). As found previously with improgan, VUF5420-induced antinociception was unaffected by administration of the opioid antagonist naltrexone, but was inhibited by the CB1 antagonist SR141716A, suggesting a non-opioid, cannabinoid-related analgesic action. However, VUF5420 showed very low affinity (Kd approximately 10 microM) on CB1-receptor activation of 35S-GTPgammaS binding, indicating that this drug does not directly interact with the CB1 receptor in vivo. The present results show that VUF5420 is a high potency, improgan-like, non-opioid analgesic which may indirectly activate cannabinoid pain-relieving mechanisms.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Hough LB,de Esch IJ,Janssen E,Phillips J,Svokos K,Kern B,Trachler J,Abood ME,Leurs R,Nalwalk JW

doi

10.1016/j.neuropharm.2006.04.003

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

447-56

issue

3

eissn

0028-3908

issn

1873-7064

pii

S0028-3908(06)00094-3

journal_volume

51

pub_type

杂志文章

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