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The role of humoral factors in the regression of leukemia in chickens as measured by in vitro colony formation
Author(s) -
Silva R. F.,
Dodge W. H.,
Moscovici C.
Publication year - 1974
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1040830204
Subject(s) - biology , yolk sac , in vitro , embryo , agar , leukemia , yolk , andrology , immunology , virology , biochemistry , microbiology and biotechnology , medicine , bacteria , ecology , genetics
Leukemic myeloblasts induced by avian myeloblastosis virus in the chicken formed small compact (type II) colonies in semi‐solid agar medium. Normal yolk sac cells from 12‐day old embryos formed large diffuse (type I) colonies under the same conditions. Type I colony formation (but not type II) was strictly dependent upon the presence in the medium of a colony stimulating factor (CSF) present in fresh chicken serum or conditioned medium. Serum CSF levels were determined for normal, leukemic, and birds which had spontaneously regressed from myeloblastic leukemia. When type I colony formation was used as the assay, serum CSF levels of leukemic birds were found to be significantly lower than levels in either normal or regressed birds. When the same sera were tested for their ability to induce type II colonies, leukemic birds demonstrated a significantly higher CSF level than either normal or regressed sera. Regressed chickens had serum CSF levels similar to normal birds.