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Dipropylcyclopentylxanthine Triggers Apoptosis In Jurkat T Cells By A Receptor-independent Mechanism
Published 1997 · Biology, Medicine
1,3-Dipropyl-8-cyclopentylxanthine (DPCPX), a xanthine analog used as selective antagonist of adenosine receptors, caused apoptosis in a human leukemia T cell line. Jurkat cells treated with DPCPX underwent apoptosis as demonstrated by flow cytometry, by DNA fragmentation and by accumulation of histones, H2A, H2B, H3 and H4, in the nucleoplasm of cells. Cell cycle and cell sorting analyses indicated an arrest of cells in G2/M followed by the appearance of apoptotic cells in G1 and G2/M phases. The mechanism of programmed cell death does not seem to be mediated by signal transduction events at the plasma membrane since it did not involve activation of cell membrane receptors and modification of the intracellular levels of Ca2+ or cAMP. Apoptosis by incorporation into DNA of a derivative of DPCPX is suggested in basis of the presence of radioactivity label in the DNA obtained from cells preincubated with [3H]DPCPX.