Journal of Clinical Endocrinology & Metabolism, Vol 51, 1058-1063, Copyright © 1980 by Endocrine Society

ARTICLES

A new sensitive and specific bioassay for lactogenic hormones: measurement of prolactin and growth hormone in human serum

T Tanaka, RP Shiu, PW Gout, CT Beer, RL Noble and HG Friesen

The replication of Nb 2 Node rat lymphoma cells in suspension culture is specifically stimulated by lactogenic hormones. Human (hPRL), ovine, bovine, and rat PRLs stimulated replication in a dose-dependent manner in the concentration range of 10 pg/ml to 1 ng/ml. Human, ovine, and bovine placental lactogens were similarly active. In addition, cell replication was stimulated by human GH (hGH), which is known to have lactogenic activity. Other hormones and growth factors examined were inactive. The growth stimulatory effects of hPRL and hGH were completely inhibited when excess anti-hPRL and anti-hGH, respectively, were added to the medium. A bioassay based on the response of the Nb 2 Node lymphoma cells to lactogenic hormones has been developed. Human serum stimulated cell replication. The effect was completely abolished if excess antibodies to both hPRL and hGH were present. The stimulation obtained with a number of human serum samples correlated very well with the sum of the hPRL and hGH concentrations in the sera, as determined by RIA (r = 0.95; P < 0.001). The concentrations of either hPRL or hGH in human serum could be individually determined by specifically blocking the growth stimulatory effect of the other hormone by adding excess anti-hGH or anti-hPRl. The sensitivity of this bioassay for PRL and hGH in serum exceeds that of RIAs.

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