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Bone marrow participates in the biosynthesis of human transcobalamin II

M Frater-Schroder, C Nissen, J Gmur, L Kierat and WH Hitzig

Studies concerning the site of synthesis of the vitamin B12 binding serum protein, transcobalamin II, have been done in various mammalian animals. The actual site of biosynthesis in man has not yet been defined. The finding that bone marrow derived cells release apo- transcobalamin II in the mouse led us to examine the genetic patterns of transcobalamin II in man, both before and after marrow transplantation. A gradual but incomplete transformation of the recipient's transcobalamin II type into donor's type, corresponding to 75% or less of the total activity, was registered in 4 cases. Surprisingly, persistent host-type TC II, in spite of different donor type, was observed in 4 further marrow recipients. We conclude that hematopoietic cells transferred with the transplanted marrow participate in the biosynthesis of human transcobalamin II.

Volume 56, Issue 3, pp. 560-563, 09/01/1980
Copyright © 1980 by The American Society of Hematology


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  Copyright © 1980 by American Society of Hematology         Online ISSN: 1528-0020