Monoclonal nonspecific suppressor factor beta inhibits interleukin-4 secretion by a type-2 helper T cell clone.
Monoclonal nonspecific suppressor factor (MNSF) is a lymphokine product of a murine T cell hybridoma that inhibits the generation of lipopolysaccharide-induced immunoglobulin secreting cells in an antigen-nonspecific manner. Most recently, a cDNA clone encoding MNSF beta, a subunit of MNSF, was isolated and sequenced (Nakamura et al., Proc. Natl. Acad. Sci. USA 1995. 92: 3463). The MNSF beta cDNA encodes a 14.5-kDa ubiquitin-like protein showing several MNSF activities. We have previously observed that hybridoma-derived native MNSF can inhibit interleukin (IL)-4 secretion by bone marrow-derived mast cells. Therefore, we studied whether MNSF beta is also able to inhibit IL-4 secretion by the type-2 helper T cell clone D10. G4.1. MNSF beta inhibited both the IL-4 secretion and the proliferation of concanavalin A-activated D10 cells, although neither effect was complete.
Nakamura
M
M
Department of Biochemistry, Shimane Medical University, Izumo, Japan.
Xavier
R M
RM
Tanigawa
Y
Y
D000818:Animals; D015152:Blotting, Northern; D002999:Clone Cells; D015847:Interleukin-4 / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D051379:Mice; D012333:RNA, Messenger / Q000032:analysis; D013491:Suppressor Factors, Immunologic / Q000502:physiology*; D018418:Th2 Cells / Q000378:metabolism*
D012333:RNA, Messenger; D013491:Suppressor Factors, Immunologic; C072169:monoclonal nonspecific suppressor factor; D015847:Interleukin-4