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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Actins, Animals, Blotting, Northern, DNA-Binding Proteins, Ethanol, Female, Gene Expression, Hypothalamus, Insulin-Like Growth Factor I, Luteinizing Hormone, Octamer Transcription Factor-2, Protein Isoforms, RNA, Messenger, Rats, Rats, Sprague-Dawley, Transcription Factors.
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Does alcohol alter insulin-like growth factor-1 activated oct 2 POU domain gene expression in the immature female hypothalamus? Context: The Oct 2 POU homeodomain gene has been shown to increase during late juvenile development; the upstream control of Oct 2 is not known, however. The insulin-like growth factor-1 (IGF-1) is known to act centrally to stimulate luteinizing hormone (LH)-releasing hormone (LHRH) release and advance female puberty. We therefore sought to determine if this peptide induces transcription of Oct 2 genes as an early pubertal event. Furthermore, as alcohol (ALC) blocks IGF-1-induced LHRH and LH release acutely, we aimed to determine if it could affect the ability of IGF-1 to stimulate Oct 2 gene expression. Female rats, 25 days old, were administered saline or IGF-1 (rat IGF-1 20 ng/3 microI) in the third ventricle at 0900 hours and killed 2, 4 and 6 hours later for assessment of Oct 2 gene expression in the preoptic area (POA) and the medial basal hypothalamus (MBH). In another experiment, we determined whether ALC (3 g/kg) could block IGF-1-induced Oct 2 gene expression. In the POA, IGF-1 did not affect the expression of Oct 2a, but it increased the Oct 2c mRNA levels at 2 hours. In the MBH, both transcripts were elevated 4 hours after IGF-1 stimulation. ALC did not alter basal expression of either of the Oct 2 gene isoforms. In both regions, however, ALC blocked IGF-1-induced gene expression.
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IGF-1 induced Oct 2 genes prior to the normal increase during the late juvenile period, indicating this IGF- 1 induction may be an early event in the activation of the LHRH secretory pathway. ALC blocks this action, suggesting the Oct 2 POU gene is a likely target by which ALC can interfere with glial-neuronal interactions and interrupt LHRH secretion during prepubertal development. Final Decision: yes