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    Brain Res Bull. 1988 Jan;20(1):75-82.

    Effects of interleukin-1 and arachidonate on the preoptic and anterior hypothalamic neurons.

    Hori T, Shibata M, Nakashima T, Yamasaki M, Asami A, Asami T, Koga H.

    Source

    Department of Physiology, Saga Medical College, Japan.

    Abstract

    Effects of microelectrophoretic application of ultrapure human interleukin-1 (IL-1), an endogenous pyrogen, on the activity of 80 neurons in the preoptic and anterior hypothalamus (PO/AH) were investigated in the urethane anesthetized rat. IL-1 predominantly decreased the activity of warm-sensitive neurons (15 of 19) and increased the activity of cold-sensitive neurons (10 of 12), but had no effect on 37 of 49 thermally insensitive neurons. The neuronal responses to IL-1 were blocked or attenuated by concurrent application of mepacrine (a phospholipase inhibitor) or sodium salicylate (a cyclooxygenase inhibitor). Local application of sodium arachidonate decreased the activity in 17 of 28 warm-units and excited 12 of 16 cold-units, and the effects of arachidonate were blocked by sodium salicylate. The results are compatible with the view that one or more cyclooxygenase metabolites of arachidonic acid are involved in the IL-1 induced fever.

    PMID:
    3124931
    [PubMed - indexed for MEDLINE]

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