Abstract:
:The aim of the present study is to investigate the mechanisms of suppression of splenic natural killer (NK) cytotoxicity caused by cold stress, using 6-hydroxydopamine (6-OHDA) as chemical sympathectomy. The NK activity was measured by (51)chromium release assay. Central sympathectomy with intracerebroventricular injection of 6-OHDA significantly reduced the elevation of the plasma corticosterone level, the expression of Fos in hypothalamic paraventricular nucleus and in locus coeruleus, as well as the suppression of NK activity induced by cold stress at 4 degrees C for 4 h. Peripheral sympathectomy with intraperitoneal (i.p.) injection of 6-OHDA and blockade of beta-adrenergic receptor with i.p. injection of propranolol also reversed the cold stress-induced suppression of NK cytotoxicity, but without significant effect on Fos expression in the brain. The results suggest that the activation of the hypothalamic-pituitary-adrenal axis induced by cold stress might be mediated, at least partially, by the central noradrenergic system, and that the cold stress-induced suppression of NK cytotoxicity might be mediated by the activation of the peripheral sympathetic nerve.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Jiang XH,Guo SY,Xu S,Yin QZ,Ohshita Y,Naitoh M,Horibe Y,Hisamitsu Tdoi
10.1016/j.neulet.2003.11.007keywords:
subject
Has Abstractpub_date
2004-03-18 00:00:00pages
1-4issue
1eissn
0304-3940issn
1872-7972pii
S0304394003013107journal_volume
358pub_type
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