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- W2415677094 abstract "Human growth hormone (hGH), like other protein hormones, consists of several molecular forms both in the pituitary and in plasma. In recent years carrier proteins have been detected and studied for growth hormone, using different experimental approaches. In the present study we have attempted to investigate whether hGH could be separated and identified in molecular or aggregated forms using high performance size exclusion chromatography and a small plasma sample, without particular treatment, in order to investigate specific hGH-binding proteins in normal as well as in acromegalic subjects. Results showed that it was possible to observe binding or/and the formation of a complex between free hormone and other molecules that could be specific binding proteins. Equilibrium was reached in a few minutes (7-10 min) and was reversible, as observed with labelled hormone using low and high concentrations of hGH in the incubation medium. At 37 degrees C the associated form at equilibrium was 30% of the total (measured as percent of total radioactivity with labelled hormone) in a plasma medium in which the original growth hormone was absent. Acromegalic plasma demonstrated that the percent of the associated form (namely the 80-kDa form) was less than that in normal humans. This may be due to the fact that capacity binding and competition between labelled and non-labelled growth hormone were favorable to the non-labelled form, if only for the high concentrations in this type of pathology. Therefore our results seem to be in agreement with the hypothesis that acromegalic subjects do not lack this aggregation capacity." @default.
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- W2415677094 date "1990-01-01" @default.
- W2415677094 modified "2023-09-23" @default.
- W2415677094 title "Human growth hormone association and binding study in vitro: high performance size exclusion chromatography and radioimmunoassay-measured levels in plasma of normal and acromegalic subjects." @default.
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