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Deregulated messenger RNA expression during T cell apoptosis
1Howard Hughes Medical Institute, New York University Medical Center, Kaplan Cancer Center, Department of Biochemistry, NY 10016, USA.
Nucleic Acids Research
|December 11, 1995
Summary
Interleukin-2 (IL-2) deprivation in CTLL-2 cells causes cell cycle gene mRNA to decrease then re-elevate during apoptosis. This re-elevated mRNA is not translated into protein, suggesting transcriptional regulation changes during programmed cell death.
Area of Science:
- Cell Biology
- Immunology
- Molecular Biology
Background:
- Interleukin-2 (IL-2) is crucial for cytotoxic T cell proliferation and survival.
- CTLL-2 cells, an IL-2 dependent cytotoxic T cell line, undergo apoptosis upon IL-2 withdrawal.
Purpose of the Study:
- To investigate the expression patterns of cell cycle-related genes during IL-2 deprivation-induced apoptosis in CTLL-2 cells.
- To understand the transcriptional and translational regulation of these genes during programmed cell death.
Main Methods:
- Analysis of mRNA expression levels for cell cycle genes (cyclins, c-myc, max, histone H4) after IL-2 deprivation.
- Measurement of c-Myc protein synthesis.
- Assessment of DNA degradation and cell viability.
Main Results:
- mRNA levels for cyclins D2, D3, B1, c-myc, and max initially decreased and then re-elevated during apoptosis.
- Histone H4 mRNA showed gradual decline, resisting the initial decrease.
- Re-elevated c-myc mRNA was not translated into protein, indicating post-transcriptional regulation or translational inhibition.
Conclusions:
- Programmed cell death involves dynamic changes in cell cycle gene mRNA expression, including a surprising re-elevation.
- The lack of protein synthesis from re-induced mRNA suggests complex regulatory mechanisms during apoptosis.
- Chromatin structure alterations may play a role in the observed transcriptional re-induction during cell death.