Augmentation of lipopolysaccharide-induced thymocyte apoptosis by interferon-gamma.
Cell Immunol
; 177(2): 103-8, 1997 May 01.
Article
en En
| MEDLINE
| ID: mdl-9178636
ABSTRACT
The role of interferon (IFN)-gamma on thymocyte apoptosis in response to lipopolysaccharide (LPS) was investigated. The administration of LPS into mice induced marked apoptosis of thymocytes in vivo, but the simultaneous injection of anti-IFN-gamma antibody with LPS completely prevented thymocyte apoptosis. Pretreatment of mice with IFN-gamma markedly enhanced LPS-induced thymocyte apoptosis. Thymocyte apoptosis augmented by IFN-gamma occurred in the thymic cortex, and target cells undergoing apoptosis were CD4+8+ immature thymocytes. IFN-gamma itself did not induce thymocyte apoptosis in vivo and in vitro. IFN-gamma exhibited no synergistic action with effector molecules, such as tumor necrosis factor (TNF)-alpha and glucocorticoids. Further, it was shown that IFN-gamma did not enhance the susceptibility of thymocytes to apoptosis. Pretreatment of mice with IFN-gamma significantly augmented the serum TNF-alpha level and the serum cortisol level in response to LPS. Therefore, we suggest that IFN-gamma might augment LPS-induced thymocyte apoptosis through elevating serum TNF-alpha and cortisol levels.
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Colección:
01-internacional
Asunto principal:
Timo
/
Linfocitos T
/
Lipopolisacáridos
/
Interferón gamma
/
Apoptosis
Límite:
Animals
Idioma:
En
Revista:
Cell Immunol
Año:
1997
Tipo del documento:
Article
País de afiliación:
Japón