Cytokines regulating human B cell growth and differentiation.
Utilizing a model system of anti-CD3-stimulated T cells, we have identified a potent B cell differentiation factor (BCDF) in the supernatant of these cells. This factor, 446-BCDF, appears to act on SAC-activated B cells inducing a 10- to 100-fold increase in Ig secretion. 446-BCDF has an apparent MW of 32 kDa and a pI of 6.0. Its activity cannot be inhibited by an anti-IL-6 antiserum, and activity is enhanced after passage over an anti-IL-6 affinity column. 446-BCDF activity is detected in the 50 mM salt fraction eluted from a Mono Q column. This 50 mM fraction has the only activity detected after passage over an anti-IL-6 affinity column and migrates with an apparent pI of 6.0. Taken together these data suggest that 446-BCDF is a unique potent polyclonal human BCDF which may be a predominant factor regulating terminal B cell differentiation.
Mayer
L
L
Division of Clinical Immunology, Mount Sinai Medical Center, New York, New York 10029.
Sherris
D
D
Huang
R
R
Cidon
M
M
D000911:Antibodies, Monoclonal; D001402:B-Lymphocytes / Q000166:cytology*; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002846:Chromatography, Affinity; D016207:Cytokines / Q000494:pharmacology*; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism; D007376:Interleukin-2 / Q000378:metabolism / Q000494:pharmacology; D015847:Interleukin-4 / Q000378:metabolism; D015850:Interleukin-6 / Q000494:pharmacology; D013601:T-Lymphocytes / Q000502:physiology
D000911:Antibodies, Monoclonal; D016207:Cytokines; D007376:Interleukin-2; D015850:Interleukin-6; D015847:Interleukin-4; D007371:Interferon-gamma