Tumor necrosis factor and interleukin-1 may regulate renin secretion

Endocrinology
I AntonipillaiR Horton

Abstract

Cytokines such as tumor necrosis factor (TNF) and interleukin-1 (IL-1) are not only immunoregulatory polypeptides, but may have endocrine functions. We have studied the direct effects of recombinant and purified TNF and IL-1 on renin secretion using both static incubations and perifusions of rat renal cortical slices. Ultrapure human IL-1 (hIL-1) at concentrations as low as 5 U/ml (3 X 10(-12) M) significantly stimulated renin secretion (control, 98 +/- 4%; hIL-1, 153 +/- 13%; P less than 0.01). TNF similarly induced renin release [control, 97 +/- 6%; TNF (10 U/ml), 151 +/- 13%; P less than 0.005]. TNF and recombinant human IL-1 beta (rhIL-i beta) also blocked the inhibitory actions of angiotensin-II (AII) on renin release [control, 100 +/- 3%; AII (2 X 10(-7) M), 80 +/- 5%; AII plus TNF (20 U/ml), 102 +/- 7%; AII plus rhIL beta (10 U/ml), 106 +/- 6%; both P less than 0.02 vs. AII]. A cyclooxygenase (CO) blocker, meclofenamate (M), which does not significantly alter basal renin release, attenuated the TNF- and rhIL-1 beta-induced renin secretion [TNF (20 U/ml), 132 +/- 11%; TNF plus M (5 X 10(-5) M), 100 +/- 3% (P less than 0.01); rhIL-1 beta (10 U/ml), 135 +/- 9%; rhIL-1 beta plus M, 105 +/- 10% (P less than 0.05)]. The stimul...Continue Reading

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