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The Journal of Immunology, Vol 154, Issue 8 3788-3795, Copyright © 1995 by American Association of Immunologists
ARTICLES |
N Neamati, A Fernandez, S Wright, J Kiefer and DJ McConkey
Department of Cell Biology, University of Texas M. D. Anderson Cancer Center, Houston 77030, USA.
Chromatin condensation and nuclear envelope breakdown are characteristic features of apoptotic cell death, but the mechanisms underlying these phenomena have not been identified. Solubilization of nuclear lamin is responsible for both events in mitosis. In this work, we report that glucocorticoids stimulate rapid degradation of lamin B1 that occurs before oligonucleosomal DNA fragmentation in apoptotic thymocytes. Protease inhibitors and the Ca2+ buffering agent BAPTA-AM block lamin degradation and DNA fragmentation, indicating that the processes are regulated by similar or identical mechanisms. Incubation of isolated thymocyte nuclei with Ca2+ stimulates lamin degradation before the detection of oligonucleosomal DNA fragments. However, in contrast to lamin dissolution during mitosis and some other forms of apoptosis, glucocorticoid-induced degradation of lamin B1 in thymocytes is not accompanied by dephosphorylation-mediated activation of cdc2. Our results demonstrate that lamin degradation is an early feature of apoptosis in thymocytes and suggest that chromatin condensation and breakdown of the nuclear envelope may occur as a result of disruption of nuclear lamina architecture.
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