Interaction of nerve growth factor with murine alpha-macroglobulin.

Title

Interaction of nerve growth factor with murine alpha-macroglobulin.

Creator

Koo P H; Stach R W

Publisher

Journal of neuroscience research

Date

1989
1989-03

Description

The murine nerve growth factor, when injected i.v. or, combined in vitro with plasma, was found largely associated with the mouse alpha-macroglobulin (a homologue of human alpha 2-macroglobulin). The nerve growth factor-alpha-macroglobulin complex produced is sufficiently stable to resist separation by gel filtration in 1.0 M sodium chloride, polyacrylamide gel electrophoresis, and immunoprecipitation by antibodies against alpha-macroglobulin. As determined by equilibrium binding studies and computer generated Scatchard analysis, alpha-macroglobulin apparently possesses two types of binding sites with the apparent dissociation constants of 1.2 x 10(-6) and 2.9 x 10(-9) M, respectively, saturable by 3.7 and 0.03 moles of nerve growth factor. Hence, about one mole of nerve growth factor is bound to each of the four subunits of alpha-macroglobulin. Nerve growth factor can be readily dissociated from alpha-macroglobulin in sodium dodecyl sulfate gel electrophoresis in the absence of a reductant. Procedures that affect the proteinase-binding or methylamine- activities of alpha-macroglobulin do not affect the binding of nerve growth factor, and the binding is unaffected by the presence of zinc ions or EDTA. Hence, nerve growth factor is noncovalently associated with alpha-macroglobulin at a site separate from that of the proteinase-, methylamine-, and zinc-binding sites of alpha-macroglobulin. Mouse alpha-macroglobulin can protect the nerve growth factor from inactivation by trypsin. Even in the presence of trypsin, alpha-macroglobulin-nerve growth factor complexes still can stimulate the neurite outgrowth by dorsal root ganglia of

Subject

alpha-Macroglobulins/*metabolism; Animals; Cells; Chick Embryo; Cultured; Ganglia; Methylamines/pharmacology; Mice; Nerve Growth Factors/*metabolism; Spinal/*cytology/drug effects; Trypsin/pharmacology; Zinc/pharmacology

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

247–261

Issue

3

Volume

22

Citation

Koo P H; Stach R W, “Interaction of nerve growth factor with murine alpha-macroglobulin.,” NEOMED Bibliography Database, accessed December 5, 2021, https://neomed.omeka.net/items/show/3062.

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