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Abstract

Effects of thyrotropin-releasing hormone (TRH) on the actions of pentobarbital and other centrally acting drugs.

G R Breese, J M Cott, B R Cooper, A J Prange Jr, M A Lipton and N P Plotnikoff
Journal of Pharmacology and Experimental Therapeutics April 1975, 193 (1) 11-22;
G R Breese
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J M Cott
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B R Cooper
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A J Prange Jr
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M A Lipton
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N P Plotnikoff
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Abstract

Thyrotropin-releasing hormone (TRH) was found to antagonize pentobarbital-induced sleeping time and hypothermia. While 3 to 100 mg/kg of TRH reduced pentobarbital sleeping time when administered prior to the barbiturate, a dose-response relationship to TRH could not be established. However, doses of 10 to 100 mg/kg of TRH enhanced the lethality of pentobarbital when these compounds were administered simultaneously. Thyrotropin or L-triiodothyronine did not imitate and hypophysectomy did not reduce the effects of TRH, indicating that the pituitary is not essential for its antagonism of pentobarbital. Studies of TRH analogs provided further support of this view. In addition, TRH reduced the sleep and hypothermia produced by thiopental, amobarbital, secobarbital and phenobarbital, and it antagonized the hypothermia and reduced motor activity produced by chloral hydrate, reserpine, chlorpromazine and diazepam. Intracisternally administered TRH also reduced pentobarbital sleeping time and hypothermia, but melanocyte-stimulating hormone release-inhibiting factor and somatostatin administered by this route did not. While reduction of pentobarbital sleeping time by TRH could not be attributed to an affect on monoamine systems or to deamidated TRH, this action was reduced by intracisternally administered atropine, suggesting that cholinergic mechanisms may contribute to the effects of TRH. Thus, the results provide evidence that TRH acts on brain independent of an effect on the pituitary.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 193, Issue 1
1 Apr 1975
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Abstract

Effects of thyrotropin-releasing hormone (TRH) on the actions of pentobarbital and other centrally acting drugs.

G R Breese, J M Cott, B R Cooper, A J Prange, M A Lipton and N P Plotnikoff
Journal of Pharmacology and Experimental Therapeutics April 1, 1975, 193 (1) 11-22;

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Abstract

Effects of thyrotropin-releasing hormone (TRH) on the actions of pentobarbital and other centrally acting drugs.

G R Breese, J M Cott, B R Cooper, A J Prange, M A Lipton and N P Plotnikoff
Journal of Pharmacology and Experimental Therapeutics April 1, 1975, 193 (1) 11-22;
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