TRF requirements for in vitro PFC responses to SRBC and R36a. I. TRF is distinct from IL 2 but indistinguishable from polyclonal BCSF.

Eisenberg L, Prystowsky MB, Dick RF, Sosman JA, Fitch FW, Quintáns J
J Immunol. 1984 132 (3): 1305-10

PMID: 6363538

In vitro PFC responses to the thymus-independent (TI) antigen Streptococcus pneumoniae R36a require T cell replacing factor(s) (TRF). This requirement for TRF is as significant as for the thymus-dependent (TD) antigen SRBC. TRF is shown to be distinct from IL 2 by the following observations: 1) culture supernatants from the cloned T cell line L2, collected over an 8-day period after allogeneic stimulation, transiently contain IL 2 activity but maintain high levels of TRF activity throughout 192 hr; 2) L2V, a variant subclone of L2, produces much higher levels of TRF activity than the parental line but no detectable IL 2 activity; 3) the addition of IL2+, TRF- supernatants from the T cell hybridoma FS6-14.13 does not affect the L2V SF-driven PFC responses to R36a or SRBC; and 4) the addition of contaminating T cells to cultures containing T cell-depleted spleen cells, L2V SF, and antigen does not affect the PFC response. TRF does appear to be indistinguishable from polyclonal B cell stimulating factor (BCSF), which stimulates polyclonal PFC responses in the absence of antigen, mitogen, or anti-Ig. The TRF and BCSF activities of L2V SF could not be separated by ion-exchange, hydrophobic-interaction, and gel-filtration chromatography. TRF and BCSF have an apparent m.w. of approximately 40,000.

MeSH Terms (22)

Animals Antibody-Producing Cells Antigens, Bacterial Antigens, T-Independent B-Lymphocytes Cell Line Growth Substances Hemolytic Plaque Technique Interleukin-2 Interleukin-4 Interleukin-5 Isoantigens Kinetics Lymphocyte Depletion Lymphokines Mice Mice, Inbred BALB C Mice, Inbred C57BL Molecular Weight Sheep Streptococcus pneumoniae T-Lymphocytes

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