Chronic electrical stimulation of the lateral hypothalamus increases natural killer cell cytotoxicity in rats.

Abstract:

:Previously, we found that in rats coagulation of the lateral hypothalamus (LH) caused depression of the peripheral blood natural killer cell cytotoxicity (NKCC) and the number of large granular lymphocytes (LGL). In the present work, we have tested the effects on both spleen and blood NKCC of acute (1 day) and chronic (21 days) electrical stimulation of LH, and LGL number in conscious, freely behaving animals. Five groups of male Wistar rats were used: LH stimulated (n=22), thalamic (Thal) stimulated control (n=4), operated but non-stimulated LH sham controls (n=7), non-operated normal control group (n=8) and spleen baseline group (n=10). Chronic stimulation of LH caused significant augmentation of NKCC (51Cr-release assay) and LGL number (a morphological method), more pronounced in the spleen than in the peripheral blood. Rats responding to LH stimulation with feeding showed a slightly greater effect than those responding with a locomotor reaction. The observed effects were anatomically specific as no influence of Thal stimulation or the sham procedure was found. The results are discussed in terms of the involvement of LH in reward phenomena and the hormonal control of the immune system.

journal_name

J Neuroimmunol

authors

Wrona D,Trojniar W

doi

10.1016/s0165-5728(03)00214-5

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

20-9

issue

1-2

eissn

0165-5728

issn

1872-8421

pii

S0165572803002145

journal_volume

141

pub_type

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