Abstract
Eight GH-deficient subjects received both subtilisin-cleaved human GH (hGH-S) and intact hGH (hGH-I) during short term balance studies to compare the potency of these two forms of GH. Both forms caused nitrogen retention, calciuria, postassium retention, and elevation of blood glucose. The effects on plasma insulin concentrations were inconstant at the doses used. hGH-S was more potent than hGH-I, as measured by nitrogen and potassium retention, and the differences reached levels of statistical significance. hGH-S also caused greater calciuria and increases in fasting the postprandial blood glucose and in postprandial insulin in absolute terms, but these differences did not reach levels of statistical significance. In no instance was hGH-I significantly more potent than hGH-S. We conclude hGH-S, a two-chain form of hGH, caused significantly greater nitrogen and potassium retention in human subjects in short term balance studies than hGH-I.
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