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The biosynthetic activity of rat intermediate lobe melanotropes in vivo is inhibited by stimulation of dopamine D 2 receptors. Individual melanotropes are innervated differentially by dopaminergic axons and vary in their levels of pro-opiomelanocortin (POMC) mRNA. We tested the hypothesis that placement of the lobe in primary culture, which removes the inhibitory innervation, would increase...
Cultures of pituitary neurointermediate lobe cells were established from rats aged 1, 12, and 42 days to identify the types and assess the activities of Ca 2+ channels present in melanotropes, glial-like cells, and fibroblasts during development. Day 12 represents the time at which dopaminergic axons have become distributed throughout the lobe, glial cells begin to lose their radial...
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