Establishment of a cyclic adenosine monophosphate-dependent growing human T-cell line derived from an interleukin-2-dependent cell line.

An adenosine 3',5'-cyclic monophosphate (cAMP)-dependent growing cell line called CT-Mat was established by the long-term cultivation of an interleukin-2 (IL-2)-dependent human T-cell line, ILT-Mat, in the presence of cholera toxin instead of IL-2. CT-Mat cells can grow in the medium containing either cholera toxin or forskolin or cAMP derivatives. Although the CT-Mat cell line can still grow dependent on IL-2, the forskolin-induced growth of CT-Mat cells was demonstrated not to be mediated by an autocrine mechanism of IL-2 or any other growth factor. The intracellular cAMP level was elevated by treatment with the chemical agents but little by treatment with IL-2. These suggest that cAMP transduces intracellular growth signals different from those through the IL-2 receptor in an IL-2-dependent T-cell line CT-Mat.