Concentrations of histamine in the hypothalamus of the rat: effect of extraction volume and interpretation of the effects of acutely-administered morphine.

Abstract:

:The effect of varying the ratio of extraction volume to tissue weight (EVR) on the apparent concentration of histamine (HA) in the hypothalamus of the rat was examined. Increasing the weight of tissue (by pooling 1, 2 or 3 hypothalami), in a constant extraction volume, resulted in progressive decreases in apparent concentration of histamine in the hypothalamus. These concentrations were 642, 450 and 282 ng/g, respectively. Morphine (10 mg/kg, i.p.) significantly reduced the concentration of histamine in the hypothalamus. Expressed as percentages of the saline-control values (obtained for the extraction volume to tissue weight of 35.7, 57.2 and 118.4 ml/g), treatment with morphine resulted in 24, 17 and 11% reductions in the concentration of histamine in the hypothalamus, respectively. However, expressed in terms of ng/g, the reductions in histamine induced by morphine were 68, 75 and 69 ng/g, respectively. It is concluded that morphine may consistently affect a single pool of histamine. The possibility that de novo histamine is formed in the homogenate during the extraction process is discussed.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Lewis SJ,Verberne AJ,Fennessy MR,Jarrott B

doi

10.1016/0028-3908(87)90263-2

subject

Has Abstract

pub_date

1987-08-01 00:00:00

pages

1167-71

issue

8

eissn

0028-3908

issn

1873-7064

journal_volume

26

pub_type

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