Abstract
Exposure of rat anterior pituitary cells in culture to a cytotoxin specific for CRF-target cells is followed by increased basal ACTH secretion from the remaining cells three days after the last exposure to the cytotoxin. When CRF-target-depleted populations are co-cultured with unexposed pituitary cells ACTH secretion is more than double that predicted in the absence of cell-to-cell interaction. These data provide evidence for an intrapituitary cell-to-cell signalling system modulating ACTH secretion.
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