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

• Published in: Immunobiology (1979) Vol. 179; no. 4-5; p. 422
• Main Authors: Robberecht, P, Abello, J, Damien, C, de Neef, P, Vervisch, E, Hooghe, R, Christophe, J
• Format: Journal Article
• Language: English
• Published: Netherlands 01.10.1989
• Subjects: Adenylyl Cyclases - metabolism; Adrenergic beta-Agonists - pharmacology; Animals; Enzyme Activation - drug effects; Lymphoma - enzymology; Mice; T-Lymphocytes - enzymology; T-Lymphocytes, Cytotoxic - enzymology; T-Lymphocytes, Helper-Inducer - enzymology; Tumor Cells, Cultured - drug effects; Tumor Cells, Cultured - enzymology; Vasoactive Intestinal Peptide - pharmacology
• ISSN: 0171-2985
• DOI: 10.1016/S0171-2985(89)80046-4

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.