alexa Extracellular ubiquitin regulates the growth of human hematopoietic cells.


Journal of Molecular Histology & Medical Physiology

Author(s): Daino H, Shibayama H, Machii T, Kitani T

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Abstract We investigated the effects of extracellular ubiquitin on the colony formation of human hematopoietic progenitor cells (CFU-GM, CFU-E and BFU-E) and a granulocyte-colony stimulating factor (G-CSF)-dependent human myeloblastic leukemic cell line, OCI/AML/1a. Ubiquitin exhibited inhibitory effects on CFU-GM, CFU-E, BFU-E and OCI/AML/1a colony formation. Extracellular ubiquitin also inhibited the growth of KT3 (T lymphoblast), K562 (erythroleukemia) and Daudi (Burkitt's lymphoma) cells, stimulated the growth of HL60 (promyelocytic leukemia) and Jurkat (T-ALL) cells and showed no effect on the growth of U937 cells (monocytic leukemia). These results indicate that another, previously unrecognized function of extracellular ubiquitin is to regulate hematopoiesis. This article was published in Biochem Biophys Res Commun and referenced in Journal of Molecular Histology & Medical Physiology

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