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Two forms of murine epidermal growth factor: rapid separation by using reverse-phase HPLC.

A W Burgess·J Knesel·L G Sparrow·N A Nicola·E C Nice
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Abstract

Epidermal growth factor (EGF) has been isolated from acid extracts of C57BL6/J mouse submaxillary glands by using hydrophobic chromatography. High yields of EGF in large amounts (10 mg) can be isolated reliably from the acid extract of the glands in less than 4 hr. The reverse-phase HPLC techniques used to purify the EGF initially yielded what appeared to be a single homogeneous EGF molecule. However, ion pairing reagents (e.g., heptafluorobutyric acid) altered the chromatographic properties, revealing two distinct species: EGF-alpha and EGF-beta. The apparent molecular weights, isoelectric points, and antigenic properties of EGF-alpha and EGF-beta were identical, and both forms stimulated a mitogenic response in 3T3 cells. Analysis of different preparations of purified EGF (commercial and experimental) indicated the presence of EGF-alpha and EGF-beta in constant proportion. Previous EGF binding studies must have used mixtures of 125I-labeled EGF-alpha and 125I-labeled EGF-beta. The two molecules appear to compete for an identical receptor on the cell surface.

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AnimalsChromatography, High Pressure LiquidEpidermal Growth FactorMaleMiceMice, Inbred C57BLMolecular WeightSolventsSubmandibular GlandJournal ArticleResearch Support, Non-U.S. Gov't

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A W Burgess, J Knesel, L G Sparrow, N A Nicola, E C Nice. 1982. Two forms of murine epidermal growth factor: rapid separation by using reverse-phase HPLC.. https://doi.org/10.1073/pnas.79.19.5753

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