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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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The present study examines the effect of naloxone, mu-opioid receptor antagonist, on prolactin (PRL) gene expression and secretion induced by estradiol (I) treahent in vivo. Adult rats were ovariectomized (OW) and implanted with Silastic capsules containing either vehicle (oil) or E. Three days later, NAL (2 mg/kg BW) or saline urere injected 30 min prior to sacrifice. To examine PRL secretion in vitro, the pituitaries were incubated in the superfusion system for 3 hrs. Superfusates were collected at 10 min intenrals on ice and subjected to PRL radioimmunoassay. Endogenous release of PRL in OU( + I rats was signifcantlv higher than that in OVX rats (mean $\pm$ SE; 24.5 $\pm$ 3.1 vs 14.5 $\pm$ 2.9 ns/10 min). A single injection of NAL clearly inhibited PRL release in Nitro from pituitaries derived from OW + I rats, but not from OW group. PRL myNA was determined by RNA-blot hybridisation assay with nicktranslated PRL CDNA. E stimulated PRL mRNA about 3 fold over that shown in OW group. Treahent of NAL suppressed the I-stimulated PRL myNA in OVX + I group, but not in OVX group. These data clearly showed that the NAL-induced inhibition of PRL secretion was well correlated with changes in PRL mRNA level and this inhibitory process appears to be mediated in I-dependent manner.
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