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Ovine growth hormone ( oGH ) was tested for its effects on lipolysis of rat and ovine adipose tissue in vitro. Ovine growth hormone at 1, 5 and 25 micrograms/ml stimulated lipolysis (P less than .05) of chopped rat adipose tissue and isolated rat adipocytes incubated in the presence of 100 mU/ml adenosine deaminase and .2 micrograms/ml dexamethasone, but had no effect on lipolysis of chopped ovine adipose tissue or isolated ovine adipocytes. Isoproterenol, a beta-adrenergic agonist, stimulated lipolysis (P less than .05) of both rat and ovine adipose tissue. Contaminants of the oGH preparation used were examined for lipolytic effects. Thyroid-stimulating hormone (TSH), luteinizing hormone (LH) and adrenocorticotropic hormone (ACTH) content in oGH were measured by radioimmunoassay. When quantities of these hormones contaminating 5 and 25 micrograms oGH were tested for lipolysis in rat adipose tissue, the TSH contamination could account for some (30%) of the lipolysis observed with oGH , while the other hormones had no effect. Also, preincubation of oGH with anti-GH, but not with anti-TSH or anti-LH, removed the principle in oGH responsible for the lipolytic effect on rat adipose tissue.(ABSTRACT TRUNCATED AT 250 WORDS)
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| http://dx.doi.org/10.2527/jas1984.5851191x | DOI Listing |
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