“…IL-1 induces fever, cartilage breakdown, bone resorption, thymocyte proliferation, ac tivation of T and B lymphocytes, induction of acute phase protein synthesis from hépato cytes, fibroblast proliferation and differentia tion of bone marrow stem cells [36][37][38] then respond to lineage-specific growth fac tors [39]. 1L-3 has been shown to support pro liferation and differentiation of multipotential stem cells as well as early progenitor cells of the myeloid lineage [40], The effect of IL-3 is more significant in early rather than termi nal stages of cellular maturation and is pre dominantly involved in inducible hemato poiesis [41]. However, in addition to its ac tion on myeloid lineage cells, IL-3 has been shown to promote pre-B-cell growth [42] and to induce T-cell receptor gamma gene tran scription [43] indicating the involvement of this cytokine in the growth and differentiation of the lymphoid lineage too.…”