J Neuroimmunol. 1992 Nov;41(1):117-20.

Presynaptic inhibitory effect of TNF-alpha on the release of noradrenaline in isolated median eminence.

Elenkov IJ, Kovács K, Duda E, Stark E, Vizi ES.

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Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest.

Abstract

The effect of tumor necrosis factor-alpha (TNF-alpha) on the stimulation-evoked release of noradrenaline (NA) from isolated rat median eminence (ME) was investigated, using a low-volume perfusion system. Median eminence, loaded with [3H]noradrenaline, was superfused with Krebs solution and stimulated electrically (2 Hz, 120 shocks). The effect of TNF-alpha was studied on the S2/S1 ratio. It was found that stimulation-evoked release of NA from noradrenergic axon terminals in the isolated rat ME was inhibited by TNF-alpha and this effect was concentration-dependent. In contrast, TNF-alpha had no effect on the release of [3H]NA from the spleen. Since NA released in the ME might be involved in the modulation of corticotropin-releasing factor (CRF) production, it is suggested that TNF-alpha, through presynaptic modulation of NA release from noradrenergic nerve terminals in the ME, might regulate CRF and other neurohormone release in this hypothalamic structure.

PMID:: 1460089; [PubMed - indexed for MEDLINE]

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