Summary
Ceruloplasmin (Cp) is a copper-transport protein with ferric oxidase activity found in high concentrations in the plasma of all vertebrates. Five cell lines (TR-1, TR-M, TR-ST, TM3, and TM4) derived from the testis can be grown in hormone-supplemented serum-free medium. Cp stimulates the growth of four of these five cell lines in serum-free medium. The growth stimulation by Cp is not affected by the addition or deletion of free copper, nor does copper itself elicit any significant growth response. Cp can stimulate growth also in the absence of TF suggesting that it is not acting solely to promote Fe(III)-TF binding. A strong interaction is seen between Cp and high density lipoprotein (HDL), with the presence of either decreasing the growth-promoting activity of the other. It is suggested that these cell lines may provide an ideal system for studying the action of Cp at the cellular level.
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Presented in the symposium on Plant and Animal Physiology in Vitro at the 33rd Annual Meeting of the Tissue Culture Association, San Diego, California, June 6–10, 1982.
This work was supported by NIH P50 Grant HO-13541. I am grateful to Ms. Florence Kaczorowski for her expert technical assistance.
This symposium was supported in part by the following organizations: Bellco Glass, Inc., California Branch of the Tissue Culture Association, Collaborative Research, Hana Media, Hybridtech, K C Biological, Inc., and Millipore Corporation.
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Mather, J.P. Ceruloplasmin, a copper-transport protein, can act as a growth promoter for some cell lines in serum-free medium. In Vitro Cell.Dev.Biol.-Plant 18, 990–996 (1982). https://doi.org/10.1007/BF02796373
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DOI: https://doi.org/10.1007/BF02796373