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2.
Infect Immun ; 85(2)2017 02.
Artículo en Inglés | MEDLINE | ID: mdl-27849182

RESUMEN

Staphylococcus aureus is the leading cause of skin and skin structure infections (SSSI). The high frequency of recurring SSSI due to S. aureus, including methicillin-resistant S. aureus (MRSA) strains, despite high titers of specific antibodies and circulating T cells, implies that traditional adaptive immunity imparts incomplete protection. We hypothesized that innate immune memory contributes to the protective host defense against recurring MRSA infection. To test this hypothesis, SSSI was induced in wild-type and rag1-/- mice in the BALB/c and C57BL/6 backgrounds. Prior infection (priming) of wild-type and rag1-/- mice of either background afforded protection against repeat infection, as evidenced by reduced abscess severities and decreased CFU densities compared to those in naive controls. Interestingly, protection was greater on the previously infected flank than on the naive flank for wild-type and rag1-/- mice. For wild-type mice, protective efficacy corresponded to increased infiltration of neutrophils (polymorphonuclear leukocytes [PMN]), macrophages (MΦ), Langerin+ dendritic cells (LDC), and natural killer (NK) cells. Protection was associated with the induction of interleukin-17A (IL-17A), IL-22, and gamma interferon (IFN-γ) as well as the antimicrobial peptides CRAMP and mßD-3. Priming also protected rag1-/- mice against recurring SSSI, with increased MΦ and LDC infiltration and induction of IL-22, CRAMP, and mßD-3. These findings suggest that innate immune memory, mediated by specific cellular and molecular programs, likely contributes to the localized host defense in recurrent MRSA SSSI. These insights support the development of targeted immunotherapeutic strategies to address the challenge of MRSA infection.


Asunto(s)
Interacciones Huésped-Patógeno/inmunología , Inmunidad Innata , Memoria Inmunológica , Staphylococcus aureus Resistente a Meticilina/inmunología , Infecciones Cutáneas Estafilocócicas/inmunología , Infecciones Cutáneas Estafilocócicas/microbiología , Animales , Citocinas/genética , Citocinas/metabolismo , Modelos Animales de Enfermedad , Susceptibilidad a Enfermedades , Expresión Génica , Masculino , Ratones , Ratones Noqueados , Recurrencia , Bazo/citología , Bazo/inmunología , Infecciones Cutáneas Estafilocócicas/patología
6.
Waste Manag ; 28(10): 1697-8, 2008.
Artículo en Inglés | MEDLINE | ID: mdl-18657409
10.
12.
Waste Manag ; 26(6): 557-8, 2006.
Artículo en Inglés | MEDLINE | ID: mdl-16638583
14.
Waste Manag ; 26(3): 207-8, 2006.
Artículo en Inglés | MEDLINE | ID: mdl-16377169
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