Rat hypothalamic corticotropin-releasing hormone secretion in vitro is stimulated by interleukin-1 in an eicosanoid-dependent manner.

Abstract:

:We studied the effect of interleukin-1 alpha (IL-1) on corticotropin-releasing hormone (CRH) secretion by explanted rat hypothalami in vitro. We also assessed possible mediation of arachidonic acid metabolites on IL-1-stimulated CRH secretion, by preincubating hypothalami with the cyclooxygenase inhibitor indomethacin (INDO, 1 microM), the lipoxygenase and cyclooxygenase inhibitor eicosatetraynoic acid (ETYA, 10 microM), or the lipoxygenase inhibitor nordihydroguaiaretic acid (NDGA, up to 30 microM). In additional experiments, prostaglandins (PG) E2 and F2 alpha were added to the cultures treated with INDO or ETYA. Finally, we investigated the effect of dexamethasone (DEX) on IL-1-stimulated CRH secretion. IL-1 stimulated immunoreactive CRH (iCRH) secretion by explanted hypothalami in a concentration-dependent fashion. Both INDO and ETYA inhibited IL-1-(10nM)-stimulated iCRH secretion, whereas NDGA did not have any effect. The addition of PGF2 alpha (10 nM) restored the secretion of iCRH inhibited by INDO. DEX treatment significantly inhibited IL-1-stimulated iCRH release. Our results suggest that the stimulatory effect of IL-1 on the hypothalamic CRH neuron is mediated by the cyclooxygenase metabolites of arachidonic acid, and, among others, by PGF2 alpha.

journal_name

Life Sci

journal_title

Life sciences

authors

Bernardini R,Calogero AE,Mauceri G,Chrousos GP

doi

10.1016/0024-3205(90)90190-3

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

1601-7

issue

17

eissn

0024-3205

issn

1879-0631

pii

0024-3205(90)90190-3

journal_volume

47

pub_type

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