Regional distribution and ontogeny of the first exon variants of the rat growth hormone receptor mRNA in the brain and the pituitary gland
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Expression of the first exon variants of the rat growth hormone receptor mRNA was studied in the brain and the pituitary gland. Four of the five different variant mRNA previously identified in the liver were detected in the cerebral cortex by a conventional reverse-transcription polymerase chain reaction, and, unlike the data reported previously, a quantitative analysis revealed that approximately 90% of the total growth hormone receptor mRNA in the cerebral cortex is V1 form. The present results suggest that the V1 was also a dominant transcript in other brain areas and the pituitary gland, not only in adult but also in fetal and postnatal period. The growth hormone receptor expression in the brain was lower during fetal period than in adults, while in the pituitary gland, the expression is markedly higher in fetuses, suggesting a yet unknown role of growth hormone in the development of this organ.
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