Growth hormone (GH) retardation of muscle damage due to immobilization in old rats. Possible intervention with a new long-acting recombinant GH.

Abstract:

:Four weeks immobilization of the right leg of aged rats (26 months old) caused a marked 31% and 27% reduction of muscle mass of the plantaris and soleus muscles, respectively. In animals treated with 0.6 mg/kg body weight of growth hormone (GH), the reduction of weight of the above muscles was only 14.7 and 16.1%, respectively. Biochemical studies of the level of acid phosphatase as a marker of muscle catabolism showed a significant increase of this enzyme in the immobilized muscles. GH treatment had a positive effect in curtailing the increase due to immobilization. Studies on muscle protein oxidation used as another measure of damage in immobilized animals, showed a 400% increase in protein carbonyls in plantaris muscles. GH administration reduced this value significantly. One major issue hampering the clinical use of human GH (hGH) is its short half-life in vivo (14 min). In a previous work it was possible to enhance the in vivo longevity of other hormones such as follicle-stimulating hormone (FSH) and human chorionic gonadotropin (hCG) by fusing carboxyl-terminal peptide (CTP) of the hCG gene to the above hormones. The CTP has four serine-linked oligosaccharides, which have been shown to be important in maintaining the longer half-lives of these hormones. With the above rationale of using the CTP as a general target to increase the potency of bioactive hormones, we have now fused the CTP with hGH. This has provided us with a new successfully constructed recombinant hGH, which is currently being tested for its biological potency and for possible use in aging animals.

journal_name

Ann N Y Acad Sci

authors

Fares FA,Gruener N,Carmeli E,Reznick AZ

doi

10.1111/j.1749-6632.1996.tb39082.x

subject

Has Abstract

pub_date

1996-06-15 00:00:00

pages

430-43

eissn

0077-8923

issn

1749-6632

journal_volume

786

pub_type

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