<prompt> Macrophages are conveed to epitheloid cells by which cytokine-IL-2IFN-yTNF-aTGF-b  <response>: Ref Robbins 9e p46 IL 1and 2 stimulate proliferation of more T cells. Interferon gamma activated macrophages. TNF alpha promoters fibroblasts proliferation and activates endothelium to secreted PGs which have a role in vascular response in inflammation. TGF Beta and PDGF elaborated by the macrophages stimulate fibroblast growth. . 