Partial purification and characterization of a growth factor present in goat's colostrum. Similarities with platelet-derived growth factor

A factor in goat's colostrum which stimulates DNA synthesis and cell proliferation in Swiss 3T3 fibroblasts has been purified approx. 350-fold by a sequence of acid precipitation, cation-exchange chromatography and gel filtration. The growth factor is a highly basic, heat stable (100 degrees C...

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Bibliographic Details
Published in:Biochemical journal 1984-04, Vol.219 (2), p.609-617
Main Authors: Brown, K.D, Blakeley, D.M
Format: Article
Language:English
Subjects:
animal physiology
Animals
Cell Division - drug effects
Cell Line
Chromatography, Gel
Chromatography, Ion Exchange
colostrum
Colostrum - analysis
Cricetinae
DNA - biosynthesis
Epidermal Growth Factor - metabolism
Female
Fibroblasts - drug effects
Goats
growth factors
Growth Substances - analysis
Growth Substances - isolation & purification
Growth Substances - pharmacology
man
Milk Proteins
Oxidation-Reduction
Peptide Hydrolases - pharmacology
platelet-derived growth factor
Protein Denaturation
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Summary:A factor in goat's colostrum which stimulates DNA synthesis and cell proliferation in Swiss 3T3 fibroblasts has been purified approx. 350-fold by a sequence of acid precipitation, cation-exchange chromatography and gel filtration. The growth factor is a highly basic, heat stable (100 degrees C for 5 min) polypeptide with Mr approx. 35000. The polypeptide resists denaturation by guanidinium chloride or urea but is totally inactivated by treatment with reducing agents. The factor, which we have termed colostric basic growth factor ( CBGF ), inhibits the binding of 125I-labelled epidermal growth factor (125I-EGF) to Swiss 3T3 fibroblasts but does not inhibit 125I-EGF binding to epidermoid A431 cells. CBGF interacts synergistically with plasma in stimulating DNA synthesis in quiescent Swiss 3T3 cells. The chemical and biological properties of CBGF are thus very similar to the properties reported for the human platelet-derived growth factor. Although high concentrations of CBGF are present in the colostrum of goats, cows, and sheep, the milk of these species contains little or no factor. The origin and possible functions of CBGF are unknown.
ISSN:0264-6021
1470-8728
DOI:10.1042/bj2190609