Effect of interleukin-2 and mitogen on in vitro immunoglobulin production by peripheral blood lymphocytes from patients with selective IgM deficiency.

Immunoglobulin production by mitogen and recombinant interleukin-2-(rIL-2)-stimulated lymphocytes from IgM-deficient patients was studied. The findings were that subnormal serum IgM levels did not necessarily predict defective in vitro IgG or IgM production, lymphocytes from some IgM-deficient patients exhibited defective T cell function, and rIL-2 did not enhance defective in vitro immunoglobulin production.