Abstract |
Sepsis induces extensive apoptosis of lymphocytes, which may be responsible for the profound immune suppression of the disorder. Two potential pathways of sepsis-induced lymphocyte apoptosis, Fas and p53, were investigated. Lymphocyte apoptosis was evaluated 20-22 h after sepsis by annexin V or DNA nick-end labeling. Fas receptor-deficient mice had no protection against sepsis-induced apoptosis in thymocytes or splenocytes. p53 knockout mice (p53-/-) had complete protection against thymocyte apoptosis but, surprisingly, had no protection in splenocytes. p53-/- mice had no improvement in sepsis survival compared with appropriately matched control mice with sepsis. We conclude that both p53-dependent and p53-independent pathways of cell death exist in sepsis. This differential apoptotic response of thymocytes vs splenocytes in p53-/- mice suggests that either the cellular response or the death-inducing signal is cell-type specific in sepsis. The fact that p53-/- lymphocytes of an identical subtype (CD8-CD4+) were protected in thymi but not in spleens indicates that cell susceptibility to apoptosis differs depending upon other unidentified factors.
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Authors | R S Hotchkiss, K W Tinsley, J J Hui, K C Chang, P E Swanson, A M Drewry, T G Buchman, I E Karl |
Journal | Journal of immunology (Baltimore, Md. : 1950)
(J Immunol)
Vol. 164
Issue 7
Pg. 3675-80
(Apr 01 2000)
ISSN: 0022-1767 [Print] United States |
PMID | 10725725
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)
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Chemical References |
- Annexin A5
- Tumor Suppressor Protein p53
- fas Receptor
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Topics |
- Animals
- Annexin A5
(metabolism)
- Apoptosis
(genetics, immunology)
- Disease Models, Animal
- Flow Cytometry
- Immunophenotyping
- Mice
- Mice, Inbred C57BL
- Mice, Inbred MRL lpr
- Mice, Knockout
- Mice, Mutant Strains
- Peritonitis
(genetics, immunology, mortality, pathology)
- Sepsis
(genetics, immunology, mortality, pathology)
- Signal Transduction
(genetics, immunology)
- Survival Analysis
- Tumor Suppressor Protein p53
(deficiency, genetics, physiology)
- fas Receptor
(genetics)
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