Abstract
Caspase-independent death mechanisms have been shown to execute apoptosis in many types of neuronal injury. P53 has been identified as a key regulator of neuronal cell death after acute injury such as DNA damage, ischemia, and excitotoxicity. Here, we demonstrate that p53 can induce neuronal cell death via a caspase-mediated process activated by apoptotic activating factor-1 (Apaf1) and via a delayed onset caspase-independent mechanism. In contrast to wild-type cells, Apaf1-deficient neurons exhibit delayed DNA fragmentation and only peripheral chromatin condensation. More importantly, we demonstrate that apoptosis-inducing factor (AIF) is an important factor involved in the regulation of this caspase-independent neuronal cell death. Immunofluorescence studies demonstrate that AIF is released from the mitochondria by a mechanism distinct from that of cytochrome-c in neurons undergoing p53-mediated cell death. The Bcl-2 family regulates this release of AIF and subsequent caspase-independent cell death. In addition, we show that enforced expression of AIF can induce neuronal cell death in a Bax- and caspase-independent manner. Microinjection of neutralizing antibodies against AIF significantly decreased injury-induced neuronal cell death in Apaf1-deficient neurons, indicating its importance in caspase-independent apoptosis. Taken together, our results suggest that AIF may be an important therapeutic target for the treatment of neuronal injury.
Bibliography
Cregan, S. P., Fortin, A., MacLaurin, J. G., Callaghan, S. M., Cecconi, F., Yu, S.-W., Dawson, T. M., Dawson, V. L., Park, D. S., Kroemer, G., & Slack, R. S. (2002). Apoptosis-inducing factor is involved in the regulation of caspase-independent neuronal cell death. The Journal of Cell Biology, 158(3), 507â517.
Authors
11
- Sean P. Cregan (first)
- Andre Fortin (additional)
- Jason G. MacLaurin (additional)
- Steven M. Callaghan (additional)
- Francesco Cecconi (additional)
- Seong-Woon Yu (additional)
- Ted M. Dawson (additional)
- Valina L. Dawson (additional)
- David S. Park (additional)
- Guido Kroemer (additional)
- Ruth S. Slack (additional)
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Dates
Type | When |
---|---|
Created | 22 years, 11 months ago (Sept. 18, 2002, 2:04 p.m.) |
Deposited | 2 years, 1 month ago (July 29, 2023, 12:45 a.m.) |
Indexed | 1 month, 3 weeks ago (July 7, 2025, 1:45 a.m.) |
Issued | 23 years, 1 month ago (July 29, 2002) |
Published | 23 years, 1 month ago (July 29, 2002) |
Published Online | 23 years, 1 month ago (July 29, 2002) |
Published Print | 23 years ago (Aug. 5, 2002) |
@article{Cregan_2002, title={Apoptosis-inducing factor is involved in the regulation of caspase-independent neuronal cell death}, volume={158}, ISSN={0021-9525}, url={http://dx.doi.org/10.1083/jcb.200202130}, DOI={10.1083/jcb.200202130}, number={3}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Cregan, Sean P. and Fortin, Andre and MacLaurin, Jason G. and Callaghan, Steven M. and Cecconi, Francesco and Yu, Seong-Woon and Dawson, Ted M. and Dawson, Valina L. and Park, David S. and Kroemer, Guido and Slack, Ruth S.}, year={2002}, month=jul, pages={507–517} }