Tweet My Style It is produced by basophils , mast cells and Th2 lymphocytes.Its presence stimulates the activity of macrophages and monocytes. IL 4 is involved in the formation of an inflammatory focus. Positive effect on the production of cytokines stimulating hemopoiesis. The increase in interleukin 4 concentration thus stimulates hematopoietic processes.Interleukin 6Interleukin 6 (IL 6) has a multidirectional effect.