CD38 expression enhances sensitivity of lymphoma T and B cell lines to biochemical and receptor-mediated apoptosis.
CD38 has been widely characterised both as an ectoenzyme and as a receptor. In the present paper, we investigated the role of CD38 as possible modulator of apoptosis. CD38-positive (CD38(+)) and negative (CD38(-)) fractions, obtained by sorting CD38(+) cells from lymphoma T (Jurkat) and lymphoma B (Raji) and by transfecting lymphoma LG14 and myeloid leukemia K562 cell lines, were used. Cellular subpopulations were exposed to different triggers (H(2)O(2), UV-B, alpha-TOS and hrTRAIL) and the extent of apoptosis was determined by Annexin V-FITC/PI assay. Our data showed that, in lymphoma cells, propensity to apoptosis was significantly linked to CD38 expression and that, remarkably, such response was independent of the nature of the trigger used. Inhibition of CD38 expression by antisense oligonucleotides treatment resulted in CD38-silenced fractions which were as prone to apoptosis as CD38(-) ones. Notably, susceptibility of K562 to apoptosis-inducing challenges was not affected by CD38 expression.
Gregorini
Armando
A
Istituto di Psicologia L. Meschieri, Università di Urbino Carlo Bo, via O. Ubaldini 17, 61029 Urbino (PU), Italy. a.gregorini@uniurb.it
Tomasetti
Marco
M
Cinti
Cristina
C
Colomba
Daniela
D
Colomba
Stella
S
D051997:ADP-ribosyl Cyclase 1 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D017304:Annexin A5 / Q000378:metabolism; D000943:Antigens, Differentiation / Q000378:metabolism; D017209:Apoptosis / Q000187:drug effects / Q000528:radiation effects; D045744:Cell Line, Tumor; D005434:Flow Cytometry; D016650:Fluorescein-5-isothiocyanate / Q000031:analogs & derivatives / Q000378:metabolism; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D019169:Jurkat Cells; D020014:K562 Cells; D016393:Lymphoma, B-Cell / Q000378:metabolism*; D016399:Lymphoma, T-Cell / Q000378:metabolism*; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D053221:TNF-Related Apoptosis-Inducing Ligand / Q000494:pharmacology; D024505:Tocopherols; D014466:Ultraviolet Rays; D014810:Vitamin E / Q000031:analogs & derivatives / Q000494:pharmacology
D017304:Annexin A5; D000943:Antigens, Differentiation; C492760:FITC-annexin A5; D016376:Oligonucleotides, Antisense; D053221:TNF-Related Apoptosis-Inducing Ligand; D014810:Vitamin E; D006861:Hydrogen Peroxide; D051997:ADP-ribosyl Cyclase 1; D016650:Fluorescein-5-isothiocyanate; D024505:Tocopherols