Differential effects of pretreatment with nicotine and lobeline on nicotine‐induced changes in body temperature and locomotor activity in mice
作者:
Michael W. Decker,
Michael J. Buckley,
Jorge D. Brioni,
期刊:
Drug Development Research
(WILEY Available online 1994)
卷期:
Volume 31,
issue 1
页码: 52-58
ISSN:0272-4391
年代: 1994
DOI:10.1002/ddr.430310109
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: desensitization;thermoregulation;nicotinic cholinergic receptor
数据来源: WILEY
摘要:
AbstractAlthough lobeline and nicotine are both potent ligands at neuronal nicotinic cholinergic receptors, chronic lobeline does not produce the upregulation of nicotinic receptors found with chronic nicotine or the less potent agonist anabasine. Since agonist‐induced receptor upregulation is believed to result from receptor desensitization during chronic treatment, this suggests that lobeline may not desensitize neuronal nicotinic receptors. We addressed this question by comparing lobeline‐ and nicotine‐induced desensitization of the actions of nicotine, using body temperature and locomotor activity as dependent variables. Nicotine pretreatment reduced the hypothermia and locomotor suppression produced by a subsequent nicotine challenge, whereas lobeline pretreatment did not. When tested alone, both nicotine and lobeline reduced locomotor activity and body temperature to a similar degree, but lobeline was significantly less potent. The reductions in activity and temperature produced by nicotine were significantly attenuated in chlorisondamine‐treated mice, whereas treatment with this long‐lasting nicotinic cholinergic antagonist did not alter the effects of lobeline. Thus, nicotine and lobeline appear to differ in their ability to produce desensitization. Furthermore, the effects of these two compounds on locomotor activity and body temperature may be mediated via different mechanisma. © 1994 Wiley
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