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Journal of Clinical Endocrinology & Metabolism, Vol 49, 481-483, Copyright © 1979 by Endocrine Society

ARTICLES

Conversion of high molecular weight human epidermal growth factor (hEGF)/urogastrone (UG) to small molecular weight hEGF/UG by mouse EGF- associated arginine esterase

Y Hirata and DN Orth

Human epidermal growth factor (hEGF) has previously been isolated from urine and appears to be identical to beta-urogastrone (UG), an inhibitor of stimulated gastric acid secretion. A high molecular weight (HMW) form of hEGF/UG has recently been found in human urine which is fully immunoreactive but is less bioactive as measured by receptor binding activity. A specific arginine esterase, the EGF-binding protein from mouse submandibular glands, was capable of cleaving HMW-hEGF to yield a small molecular weight (SMW)-hEGF with full immunoreactivity and bioactivity, whereas trypsin produced a SMW-hEGF with much less bioactivity. SMW-hEGF produced by the arginine esterase appeared to be immunologically, biologically (both by receptor binding and mitogenic activity) and chromatographically similar to highly purified hEGF. These data suggest that HMW-hEGF may play a precursor role in the biosynthesis of hEGF/UG in man.




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Copyright © 1979 by The Endocrine Society