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The effect of the cytokine interleukin-1 beta on the secretion of oxytocin and vasopressin from electrically stimulated rat neurohypophysis was examined in vitro. The release of oxytocin and vasopressin was concentration-dependently increased by interleukin-1 beta in the concentration range from 4.4 pM to 440 pM. The effect of interleukin-1 beta on oxytocin secretion was less intense as compared to vasopressin. After 440 pM interleukin-1 beta the electrically evoked release of oxytocin was increased about 22% and had not reached its maximum. The vasopressin response was maximal after 44 pM interleukin-1 beta, the response being increased 43% compared to control. No trace of interleukin-1 beta was found in the posterior pituitary (less than 350 pmol/lobe, radioimmunoassay). The results indicate that interleukin-1 beta might be involved the regulation of oxytocin and vasopressin at the pituitary level.
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Christensen et al. (1990) studied this question.
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