H. Enokihara et al., REGULATION OF INTERLEUKIN-5 PRODUCTION BY INTERLEUKIN-4, INTERFERON-ALPHA, TRANSFORMING GROWTH-FACTOR-BETA AND INTERLEUKIN-6, International archives of allergy and immunology, 104, 1994, pp. 44-45
Normal lymphocytes produce IL-5 with PHA and PMA stimulation. In this
system, IL-5 production was enhanced by IL-4 and was inhibited by IFN
alpha, TGF beta and IL-6.