Variable stimulation of adenylate cyclase activity by vasoactive intestinal-like peptides and beta-adrenergic agonists in murine T cell lymphomas of immature, helper, and cytotoxic types.
We examined several cultured murine T cell lymphomas, induced by a radiation leukemia virus MuRadLV, including cell lines derived from immature T cells (5 clones of the BL/VL3 cell line), antigen-specific T helper cells (5 lines of the TL2 series), and one T cytotoxic cell line (NS8). With one exception (the TL2-9 cell line), these cells showed common characteristics: 1) an efficient adenylate cyclase system; 2) increased cyclic AMP production in response to at least one type of neurotransmitter, i.e., to the catecholamine isoproterenol and/or the neuropeptide VIP; 3) on the basis of adenylate cyclase stimulation, beta-adrenoceptors were of the beta 2 subtype and VIP receptors were of a "helodermin-preferring" subtype previously encountered in a human T lymphoblast cell line. Although we analyzed only a limited number of cell lines, it appeared that the immature T BL/VL3 clones responded to peptides of the VIP family with higher potency and efficacy than T helper and T cytotoxic cells. The membranes from the specific TL2-9 helper cell line were without adenylate cyclase activity in the presence of Gpp[NH]p, NaF, and GTP alone or GTP in the presence of isoproterenol or VIP. They produced cyclic AMP in the presence of Mn2+ and forskolin only, suggesting a defect in Gs as in S49 cyc- mouse lymphosarcoma cells. This was further demonstrated by the absence of cholera toxin-stimulated ADP-ribosylation in TL2-9 membranes.
Robberecht
P
P
Department of Biochemistry and Nutrition, Medical School, Université Libre de Bruxelles, Belgium.
Abello
J
J
Damien
C
C
de Neef
P
P
Vervisch
E
E
Hooghe
R
R
Christophe
J
J
D000262:Adenylyl Cyclases / Q000378:metabolism*; D000318:Adrenergic beta-Agonists / Q000494:pharmacology; D000818:Animals; D004789:Enzyme Activation / Q000187:drug effects; D008223:Lymphoma / Q000201:enzymology*; D051379:Mice; D013601:T-Lymphocytes / Q000201:enzymology; D013602:T-Lymphocytes, Cytotoxic / Q000201:enzymology; D006377:T-Lymphocytes, Helper-Inducer / Q000201:enzymology; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000201:enzymology; D014660:Vasoactive Intestinal Peptide / Q000494:pharmacology
D000318:Adrenergic beta-Agonists; D014660:Vasoactive Intestinal Peptide; D000262:Adenylyl Cyclases