Abstract

The present study demonstrates that PHI, a peptide belonging to the glucagon-secretin group and thus structurally similar to VIP, can release prolactin from dispersed rat anterior pituitary cells and also causes release of prolactin from hemipituitaries. PHI-like immunoreactivity has previously been demonstrated in a hypothalamic system with nerve endings in the median eminence, and, taken together, these findings suggest that PHI may represent a physiologic prolactin-releasing factor.

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