Human pituitary growth hormone: restoration of full biological activity by noncovalent interaction of two fragments of the hormone.

An ln vivo Assay for Biological Activity of Synthesized Recombinant Human Growth Hormone

Noncovalent interaction of the NH2-terminal fragment of human somatotropin with the COOH-terminal fragment of human choriomammotropin to generate growth-promoting activity.

Complementation of the plasmin fragments of reduced-carbamoylmethylated (Cam) human somatotropin (hGH) with those of reduced-carbamoylmethylated human chorionic somatomammotropin (hCS) have been investigated. It was found that the recombinant obtained by noncovalent interaction of [Cys(Cam)53]hGH-(1-134) with [Cys(Cam)-165,182,189]hCS-(141-191) exhibits 50% growth-promoting activity and nearly ...

Metal ions binding study on human growth hormone by isothermal titration calorimetric method

The interaction of hGH with some metal ions ( ) at 27°C in NaC1 solution, 50 mM was studied using Isothermal titration calorimetry. There is a set of three identical and non-interacting binding sites for binding of all these metal ions, expect . The intrinsic association equilibrium constants () are not very different for  and , and also their molar enthalpies of binding (KJ/mol for  and  KJ/mo...

Papillary Carcinoma of Thyroid Gland in a Patient Treated with Recombinant Growth Hormone

The first successful treatment of growth hormone (GH) deficient children with GH extracted from human pituitary was introduced during late 1950's.  The subsequent availability and use of recombinant GH (rhGH) for different clinical conditions raised the question of whether this new therapeutic modality increases the risk of certain conditions such as leukemia or malignancy.  Herein, we report o...

Responses of growth rates and growth hormone levels of African catfish (Clarias gariepinus) to stocking density

In order to estimate responses of growth rate and growth hormone of Clarias gariepinus to stocking density, fish (initial weight 30.71 ± 0.89 g) were stocked in 120-L tanks at densities of 35, 65, 95, and 125 kg/m3 for 60 days. On day 30 and 60, the fish growth rates were measured, pituitary growth hormone (GH) mRNA levels and serum GH concentrations were examined by real-time qPCR and ELISA te...