Presynaptic inhibitory effect of TNF-alpha on the release of noradrenaline in isolated median eminence.
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.
Elenkov
I J
IJ
Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest.
Kovács
K
K
Duda
E
E
Stark
E
E
Vizi
E S
ES
D000704:Analysis of Variance; D000818:Animals; D004305:Dose-Response Relationship, Drug; D066298:In Vitro Techniques; D008297:Male; D008473:Median Eminence / Q000378:metabolism*; D009638:Norepinephrine / Q000096:biosynthesis*; D051381:Rats; D017208:Rats, Wistar; D013569:Synapses / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
D014409:Tumor Necrosis Factor-alpha; D009638:Norepinephrine