title: Different regulatory effects of pentoxifylline on human T cell activation pathways.
abstract: Pentoxifylline (PTX), a methylxanthine derivative, was examined for its effects on T cell proliferation and cytokine production stimulated by cross-linking anti-CD3 alone, anti-CD3 with PMA, anti-CD3 with anti-CD26, or anti-CD3 with anti-CD28 mAb, respectively. PTX at a 3.5 x 10(-5) M concentration significantly inhibited T cell proliferation and the production of tumor necrosis factor-alpha, interleukin-2, and interleukin-4. Moreover, this effect was selective for stimulation by cross-linking anti-CD3 with PMA, or anti-CD3 with anti-CD26, but not by cross-linking anti-CD3 with anti-CD28. These results suggest that the inhibitory effect of PTX on T cell activation involves the CD3 and CD26, but not the CD28 signal pathway.
authors.affiliation: Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.
authors.forename: R P
authors.initials: RP
authors.lastname: Dong
authors.forename: Y
authors.initials: Y
authors.lastname: Umezawa
authors.forename: H
authors.initials: H
authors.lastname: Ikushima
authors.forename: Y
authors.initials: Y
authors.lastname: Munakata
authors.forename: S F
authors.initials: SF
authors.lastname: Schlossman
authors.forename: C
authors.initials: C
authors.lastname: Morimoto
mesh_terms: D002470:Cell Survival / Q000187:drug effects; D016207:Cytokines / Q000096:biosynthesis / Q000187:drug effects; D006801:Humans; D008213:Lymphocyte Activation / Q000187:drug effects*; D010431:Pentoxifylline / Q000494:pharmacology*; D013601:T-Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D018417:Th1 Cells / Q000187:drug effects / Q000378:metabolism; D018418:Th2 Cells / Q000187:drug effects / Q000378:metabolism
chemical_list: D016207:Cytokines; D010431:Pentoxifylline