RESUMO
We have developed a murine model expressing the rhesus macaque (RM) Mamu-A01 MHC allele to characterize immune responses and vaccines based on antigens of importance to human disease processes. Towards that goal, transgenic (Tg) mice expressing chimeric RM (alpha1 and alpha2 Mamu-A01 domains) and murine (alpha3, transmembrane, and cytoplasmic H-2K(b) domains) MHC Class I molecules were derived by transgenesis of the H-2K(b)D(b) double MHC Class I knockout strain. After immunization of Mamu-A01/K(b) Tg mice with rVV-SIVGag-Pol, the mice generated CD8(+) T-cell IFN-gamma responses to several known Mamu-A01 restricted epitopes from the SIV Gag and Pol antigen sequence. Fusion peptides of highly recognized CTL epitopes from SIV Pol and Gag and a strong T-help epitope were shown to be immunogenic and capable of limiting an rVV-SIVGag-Pol challenge. Mamu-A01/K(b) Tg mice provide a model system to study the Mamu-A01 restricted T-cell response for various infectious diseases which are applicable to a study in RM.
Assuntos
Vacinas contra a AIDS , Linfócitos T CD8-Positivos/imunologia , Genes MHC Classe I/imunologia , Antígenos de Histocompatibilidade Classe I/genética , Antígenos de Histocompatibilidade Classe I/imunologia , Vírus da Imunodeficiência Símia/imunologia , Vacinas contra a AIDS/genética , Vacinas contra a AIDS/imunologia , Animais , Linhagem Celular , Epitopos de Linfócito T , Feminino , Genes MHC Classe I/genética , HIV/genética , HIV/imunologia , Macaca mulatta , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Camundongos Transgênicos , Modelos Animais , Transgenes/genética , Vacinas Sintéticas , Vaccinia virus/genética , Vaccinia virus/imunologiaRESUMO
PNRC2 was identified in our laboratory as a general cofactor for nuclear receptors. To better characterize the physiological function of PNRC2, we used gene-targeting technology to generate PNRC2-null mice (PNRC2(-/-) mice). These PNRC2(-/-) mice are viable and fertile. PNRC2-null mice, especially male mice, are lean and are resistant to high fat diet-induced obesity but without the induction of insulin resistance. Male mice devoid of PNRC2 protein have a higher metabolic rate than wild-type mice. They consume more oxygen and produce more heat. Consistent with reduced adipose mass, the levels of leptin are lower in PNRC2(-/-) mice. This study provides evidence that PNRC2 plays one or more important roles in controlling the energy balance between energy storage and energy expenditure. PNRC2 may be a new target in the treatment of obesity and related metabolic diseases.
