T cell replacing factor/interleukin 5 induces not only B-cell growth and differentiation, but also increased expression of interleukin 2 receptor on activated B-cells.
A T-cell replacing factor (TRF)/interleukin-5 (IL-5) is a B-cell growth and differentiation factor. In the present study, we examined the role of TRF/IL-5 in the increase in the levels of interleukin-2 (IL-2) receptor expression on activated B-cells. High pressure liquid chromatography (HPLC)-purified TRF/IL-5 (B151-TRF) from TRF-producing T-cell hybridoma, B151K12, as well as recombinant TRF/IL-5 (rec-TRF) were used for the analysis. Maximum anti-2,4-dinitrophenyl (DNP) IgG antibody response of DNP-primed B-cells or polyclonal IgM secretion of B-cell tumor line BCL1 was seen when HPLC-purified B151-TRF was added or when suboptimal doses of B151-TRF were added to the culture in the presence of IL-2. Normal resting B-cells gave maximum anti-SRBC IgM PFC responses when HPLC-purified B151-TRF and IL-2 were present. The purified B151-TRF as well as rec-TRF also induced on B-cells increased expression of IL-2 receptors that react with monoclonal anti-murine IL-2 receptor antibody, PC61, and 125I-labelled IL-2. The numbers of functional high affinity IL-2 receptors on activated B cells increased at least 20-fold by culturing them with purified B151-TRF. Moreover, B151-TRF induced increase in the levels of steady-state mRNA for IL-2 receptor by approximately 8-fold. These results suggest that activated B-cells as well as BCL1-cells may express functional IL-2 receptors or closely related molecules when stimulated with HPLC-purified B151-TRF as well as rec-TRF.
D000818:Animals; D000917:Antibody Formation / Q000187:drug effects; D000921:Antibody-Producing Cells / Q000166:cytology; D001402:B-Lymphocytes / Q000166:cytology*; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D004357:Drug Synergism; D005786:Gene Expression Regulation / Q000187:drug effects; D007376:Interleukin-2 / Q000494:pharmacology; D015848:Interleukin-5; D007378:Interleukins / Q000494:pharmacology / Q000502:physiology*; D008213:Lymphocyte Activation; D051379:Mice; D012333:RNA, Messenger / Q000235:genetics; D011971:Receptors, Immunologic / Q000502:physiology*; D015375:Receptors, Interleukin-2
D007376:Interleukin-2; D015848:Interleukin-5; D007378:Interleukins; D012333:RNA, Messenger; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2