Title : Changes in noradrenergic sensitivity to tumor necrosis factor-alpha in brains of rats administered clonidine.

Pub. Date : 1996 Oct

PMID : 8862135






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1 Changes in noradrenergic sensitivity to tumor necrosis factor-alpha in brains of rats administered clonidine. Clonidine tumor necrosis factor Rattus norvegicus
2 Furthermore, constitutive TNF alpha, demonstrated to be present in several brain areas, was significantly decreased following administration of the alpha 2-adrenergic agonist clonidine (0.6 mg/kg, i.p., twice daily) to rats for either 1 or 14 days, without a change in TNF alpha mRNA accumulation. Clonidine tumor necrosis factor Rattus norvegicus
3 Furthermore, constitutive TNF alpha, demonstrated to be present in several brain areas, was significantly decreased following administration of the alpha 2-adrenergic agonist clonidine (0.6 mg/kg, i.p., twice daily) to rats for either 1 or 14 days, without a change in TNF alpha mRNA accumulation. Clonidine tumor necrosis factor Rattus norvegicus
4 We next investigated whether the presynaptic sensitivity to TNF alpha was changed after clonidine administration to rats. Clonidine tumor necrosis factor Rattus norvegicus
5 TNF alpha enhanced, rather than inhibited, [3H]-NE release after 1 day of clonidine administration, while a suppressed sensitivity to TNF alpha was observed in the hippocampus after 14 days of clonidine administration. Clonidine tumor necrosis factor Rattus norvegicus
6 TNF alpha enhanced, rather than inhibited, [3H]-NE release after 1 day of clonidine administration, while a suppressed sensitivity to TNF alpha was observed in the hippocampus after 14 days of clonidine administration. Clonidine tumor necrosis factor Rattus norvegicus
7 In addition, in the presence of idazoxan, TNF alpha potentiation of [3H]-NE release after 1 day clonidine administration was reversed to a decreased inhibition as compared to control slices exposed to idazoxan. Clonidine tumor necrosis factor Rattus norvegicus
8 Therefore, the temporary reversal in the presynaptic TNF alpha response after 1 day of clonidine administration illustrates a mechanism of action for its persistent antihypertensive effect, its transient sedative and antihyperpathic effects, and its acute ability to promote antidepressants. Clonidine tumor necrosis factor Rattus norvegicus