Abstract
Suspensions of thymocytes from young rats were incubated with 2,3,7,8- tetrachlorodibenzo- p -dioxin (TCDD), which resulted in a sustained increase in cytosolic free Ca 2+ concentration followed by DNA fragmentation and loss of cell viability. Both the Ca 2+ increase and DNA fragmentation were prevented in cells treated with the inhibitor of protein synthesis, cycloheximide, and DNA fragmentation and cell killing were not detected when cells were incubated in a "Ca 2+ -free" medium or pretreated with high concentrations of the calcium probe, quin-2 tetraacetoxymethyl ester. These results indicate that TCDD can kill immature thymocytes by initiating a suicide process similar to that previously described for glucocorticoid hormones.
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Dates
Type | When |
---|---|
Created | 18 years, 10 months ago (Oct. 5, 2006, 5:21 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 13, 2024, 10:28 p.m.) |
Indexed | 1 month, 3 weeks ago (July 11, 2025, 6:26 a.m.) |
Issued | 36 years, 10 months ago (Oct. 14, 1988) |
Published | 36 years, 10 months ago (Oct. 14, 1988) |
Published Print | 36 years, 10 months ago (Oct. 14, 1988) |
@article{McConkey_1988, title={2,3,7,8-Tetrachlorodibenzo- p -Dioxin Kills Immature Thymocytes by Ca 2+ -Mediated Endonuclease Activation}, volume={242}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.3262923}, DOI={10.1126/science.3262923}, number={4876}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={McConkey, David J. and Hartzell, Pia and Duddy, Steven K. and Håkansson, Helen and Orrenius, Sten}, year={1988}, month=oct, pages={256–259} }