title: Effects of diheptyldiselenide (DDS) on human tumor cell lines and on peripheral blood mononuclear cells.
abstract: In vitro effects of graded concentrations of diheptyldiselenide (DDS) on human tumor cell proliferation, and on the proliferative responses and immunological functions of peripheral blood mononuclear cells (MNC) were investigated. The agent significantly decreased tumor cell proliferation in a dose and time dependent manner. Proliferative responses of MNC to phytohemagglutinin (PHA) and interleukin-2 (IL-2) were also significantly depressed when MNCs were exposed to DDS (250 microM for 18 h) led to a significant increase in NK activity only in MNC samples showing very limited baseline NK function. On the other hand, generation of LAK cells was significantly inhibited by DDS. However, when the agent was added to the effector and target cell mixture during the 4 h 51Cr release cytotoxicity assay, no influence was found on NK and LAK-mediated target cell lysis. These studies show that high concentrations of DDS inhibit tumor cell proliferation and could also impair certain proliferative-dependent immune functions, without directly affecting cell-mediated cytolytic activity of effector cells.
authors.affiliation: Department of Experimental Medicine and Biochemical Sciences, University of Rome Tor Vergata, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Tentori
authors.forename: S P
authors.initials: SP
authors.lastname: Prete
authors.forename: R
authors.initials: R
authors.lastname: Pepponi
mesh_terms: D015703:Antigens, CD / Q000032:analysis; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D005434:Flow Cytometry; D006536:Heptanes / Q000494:pharmacology*; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology; D015979:Killer Cells, Lymphokine-Activated / Q000187:drug effects / Q000502:physiology; D007694:Killer Cells, Natural / Q000187:drug effects; D007963:Leukocytes, Mononuclear / Q000187:drug effects* / Q000276:immunology; D008213:Lymphocyte Activation / Q000187:drug effects; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D015703:Antigens, CD; D000970:Antineoplastic Agents; D006536:Heptanes; D007376:Interleukin-2; C063339:diheptyldiselenide