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• W1992202362 abstract "Abstract Without increasing cell number, ovine growth hormone was shown to stimulate the incorporation of 25SO4 by cultured chick embryo chondrocytes into chondroitin sulfate. Since the stimulation of sulfation by growth hormone was abolished when the amino acid concentrations in the medium were doubled, the relationship between amino acids and growth hormone in promoting the synthesis of acid mucopolysaccharides was investigated. Comparison of the incorporation of various labeled amino acids into trichloroacetic acid-soluble and insoluble material revealed that growth hormone promoted the incorporation of only valine into trichloroacetic acid-insoluble material. Furthermore, growth hormone stimulated valine incorporation into both extracellular and intracellular protein, rather than preferentially into extracellular chondromucoprotein. Growth hormone gave a 4-fold stimulation of valine incorporation into collagen without stimulating collagen synthesis. That growth hormone enhances sulfation by stimulating valine availability was further supported by the observations: (a) doubling only the valine concentration in the medium enhanced sulfation; (b) in medium with twice the normal valine concentration, sulfation failed to be further stimulated with the addition of growth hormone; and (c) in medium with all the other amino acids except valine at twice normal concentrations, growth hormone enhanced sulfation. In addition the temporal relationships and synthetic events occurring between growth hormonealtered valine availability and enhanced chondromucoprotein synthesis were studied. It was found that growth hormone-promoted valine incorporation into acid-insoluble material is a rapid effect that can be detected by 10 min after hormone addition and does not require RNA synthesis. Increased valine availability is rapidly reversed after growth hormone removal ( t 1 2 = 10 hr ). On the other hand, growth hormone- and valine-enhanced chondromucoprotein synthesis are slower responses, taking over 24 hr of treatment for a maximal stimulation, and are mediated by RNA synthesis, as indicated by actinomycin D sensitivity. Enhanced chondromucoprotein synthesis is also relatively stable after removal of growth hormone or valine ( t 1 2 = 70 hr ). The evidence suggests that the availability of a single amino acid, valine, plays a regulatory role in the synthesis of a specialized cellular product and that growth hormone acts at some level to alter the availability of this essential amino acid." @default.
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• W1992202362 title "Mediation of growth hormone-enhanced expression of the cartilage phenotype in vitro by the availability of the essential amino acid valine" @default.
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• W1992202362 doi "https://doi.org/10.1016/0012-1606(73)90090-0" @default.
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