Pure and Mixed Erythroid Colony Formation in Vitro Stimulated by Spleen Conditioned Medium with No Detectable Erythropoietin

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1977 Sep 1

PMID 269439

Citations 52

Authors

G R Johnson

D Metcalf

Affiliations

Soon will be listed here.

Abstract

Cells from CBA fetal mouse liver formed pure or mixed erythroid colonies in semisolid agarculture after stimulation by medium conditioned by pokeweed mitogen-stimulated mouse spleen cells. In general shape, the erythroid colonies resembled typical 7-day single or multiple (burst) colonies. However one-third to one-half contained, in addition to erythroid cells, macrophages and neutrophils and, less commonly, megakaryocytes or eosinophils. Culture of micro manipulated single colony-forming cells showed these erythroid colonies to be clones. Colony-forming cells declined in frequency with advancing fetal age, but low numbers were detectable in adult bone marrow. Assays of spleen conditioned medium in polycythemic mice failed to detect erythropoietin; the cloning system may detect a fetal type of erythropoietin-independent, erythropoietic cell since few were detected in adult marrow.

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