Catecholamine innervation of luteinizing hormone-releasing hormone (LH-RH) cell subtypes in rats was investigated over development using double label, light microscopic immunocytochemistry. Similar results were observed in both sexes. The number of catecholamine-apposed sLH-RH cells remained constant, while the number of catecholamine-apposed iLH-RH cells increased as a function of age. These results suggest that LH-RH cell subtypes are differentially innervated and support the hypothesis that the development of iLH-RH cells represent newly innervated surfaces which are related to changes in the processing of incoming information relevant to reproductive maturation.
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Wray et al. (1986) studied this question.
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