Purification of multiple forms of glial growth factor - PubMed (original) (raw)

. 1993 Aug 25;268(24):18095-102.

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Purification of multiple forms of glial growth factor

A D Goodearl et al. J Biol Chem. 1993.

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Abstract

Glial growth factors (GGFs) were purified from bovine pituitaries using an in vitro rat Schwann cell mitogenesis assay. In addition to an approximately 34-kDa species termed GGF-I, similar in molecular mass to a previously identified molecule (Lemke, G. E., and Brockes, J. P. (1984) J. Neuroscience 4, 75-83), two species named GGF-II and GGF-III were characterized with apparent molecular masses of approximately 59 and approximately 45 kDa, respectively. Highly purified preparations of all species share a similar dose-dependent stimulation of Schwann cell DNA synthesis at nanomolar concentrations. Forskolin synergizes with all three GGFs, shifting their dose dependence 3-8-fold into the sub-nanomolar range. The GGFs, which contain N-linked carbohydrate groups not essential for their in vitro mitogenic effects, are three distinct members of a novel family of glial cell mitogens.

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