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, 54 (2), 137-44

The Effect of interleukin-1 Beta on the Efferent Activity of the Vagus Nerve to the Thymus

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The Effect of interleukin-1 Beta on the Efferent Activity of the Vagus Nerve to the Thymus

A Niijima et al. J Auton Nerv Syst.

Abstract

The effects of intravenous (i.v.) administration of recombinant human interleukin-1 beta (rhIL-1 beta) and human interleukin-1 beta-fraction (hfrIL-1 beta) on the activity of vagal efferent fibers innervating the thymus were observed in urethane-anesthetized rats. An i.v. injection of 10 ng rhIL-1 beta or hfrIL-1 beta caused a similar degree of increase in the efferent activity, which lasted longer than 2 h. The least effective dose was 1 ng and dose-dependent responses were observed after i.v. injection of rhIL-1 beta at doses of 1 ng, 10 ng and 100 ng. The IL-1 beta-induced activation of efferent activity of the vagal branch to the thymus implicates their involvement in the neural modulation of the thymic function.

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