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Cytokines regulating human B cell growth and differentiation
1Division of Clinical Immunology, Mount Sinai Medical Center, New York, New York 10029.
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.
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.