Salicylate as a partial inhibitor of emotional fever and body weight set-point in rats: behavioral and neuroendocrine study.

Abstract:

:In this article, we report findings from behavioral and neuroendocrine experiments in rats under pharmacologically induced antipyretic conditions. Endpoints included emotional fever, body weight setpoint, and in situ corticotropin-releasing hormone mRNA (CRHmRNA) expression. Nine male Wistar rats were treated with acetylsalicylic acid (ASA) 0.04 g/kg ip in vehicle. On alternating days, all rats received saline (0.9% w/v) as a control. ASA was selected chiefly for its antipyretic and also for effects on metabolism. It has been demonstrated that gentle handling affects body weight and body temperature in rats. In Experiment 1, we investigated whether blocking emotional fever by ASA treatment would inhibit the lowering of the body weight setpoint induced by handling of the rats. Rats were exposed to a daily food-hoarding session under handling stress, and their body weight setpoints were calculated from the hoarding measurements. As rats received ASA and saline in an alternating manner, two setpoints were calculated. In Experiment 2, we performed neuroendocrine analyses of CRHmRNA expression in the same group of animals from Experiment 1. CRHmRNA was determined by in situ hybridization. Results indicated that ASA treatment in rats significantly decreased the body weight setpoint (P=.02) and significantly prevented increases in body temperature due to emotional fever (P=.03) when compared to their control values. Findings also revealed that hypothalamic CRH expression was increased when rats were treated with ASA. ASA did partially block fever induced by handling, but it is difficult to confirm whether emotion was also inhibited by treatment. Taken together, these results indicate that salicylates affect energy balance and might be a good inhibitor of body weight gain in rats.

journal_name

Physiol Behav

journal_title

Physiology & behavior

authors

Michel C,Frankham P,Cabanac M

doi

10.1016/s0031-9384(02)01002-8

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

357-63

issue

3

eissn

0031-9384

issn

1873-507X

pii

S0031938402010028

journal_volume

78

pub_type

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