Scopolamine-physostigmine combination does not substitute for nicotine.

Abstract:

:1. Male Sprague-Dawley rats were trained to discriminate 0.4 mg/kg nicotine subcutaneously administered from its saline vehicle in a food-motivated operant discrimination task. Once trained, the discriminative performance was observed to be dose-responsive with an ED50 = 0.11 mg/kg. 2. The co-administration of 0.1 or 0.2 mg/kg physostigmine with either 0.1, 0.15 or 0.2 mg/kg scopolamine produced intermediate discriminative effects, i.e., neither nicotine- nor saline-like responding. However, the physostigmine-scopolamine combination neither substituted for nor increased the discriminative effects of co-administered nicotine. 3. The theoretical/mechanistic possibility that a combination of a cholinesterase inhibitor to increase available acetylcholine plus a specific anti-muscarinic to allow that increased acetylcholine to stimulate nicotinic receptors was investigated. Results indicate that the combination does not produce nicotine-like discriminative effects and evidence the possibility that nicotine discrimination may involve non-cholinergic mechanisms.

authors

Schechter MD

doi

10.1016/0278-5846(95)00030-y

subject

Has Abstract

pub_date

1995-05-01 00:00:00

pages

499-508

issue

3

eissn

0278-5846

issn

1878-4216

pii

027858469500030Y

journal_volume

19

pub_type

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