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1.
Nat Immunol ; 22(10): 1268-1279, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-34556885

RESUMO

Metabolic inflammation is closely linked to obesity, and is implicated in the pathogenesis of metabolic diseases. FTO harbors the strongest genetic association with polygenic obesity, and IRX3 mediates the effects of FTO on body weight. However, in what cells and how IRX3 carries out this control are poorly understood. Here we report that macrophage IRX3 promotes metabolic inflammation to accelerate the development of obesity and type 2 diabetes. Mice with myeloid-specific deletion of Irx3 were protected against diet-induced obesity and metabolic diseases via increasing adaptive thermogenesis. Mechanistically, macrophage IRX3 promoted proinflammatory cytokine transcription and thus repressed adipocyte adrenergic signaling, thereby inhibiting lipolysis and thermogenesis. JNK1/2 phosphorylated IRX3, leading to its dimerization and nuclear translocation for transcription. Further, lipopolysaccharide stimulation stabilized IRX3 by inhibiting its ubiquitination, which amplified the transcriptional capacity of IRX3. Together, our findings identify a new player, macrophage IRX3, in the control of body weight and metabolic inflammation, implicating IRX3 as a therapeutic target.


Assuntos
Proteínas de Homeodomínio/metabolismo , Inflamação/metabolismo , Macrófagos/metabolismo , Obesidade/metabolismo , Fatores de Transcrição/metabolismo , Adipócitos/metabolismo , Adulto , Animais , Peso Corporal/fisiologia , Linhagem Celular , Diabetes Mellitus Tipo 2/metabolismo , Dieta/métodos , Células HEK293 , Humanos , Masculino , Doenças Metabólicas/metabolismo , Camundongos , Células RAW 264.7 , Células THP-1 , Termogênese/fisiologia , Transcrição Genética/fisiologia , Adulto Jovem
2.
Pathogens ; 9(10)2020 Oct 19.
Artigo em Inglês | MEDLINE | ID: mdl-33086687

RESUMO

The objective of this study was to estimate the fecal carriage of Salmonella spp. among culled adult dairy cows presented to an abattoir in Wuhan, China and to evaluate their antimicrobial resistance profiles. Rectal swabs from 138 culled cows were cultured. Laboratory analysis involved the identification of Salmonella, the susceptibility assessment and the presence of Extended Spectrum ß-lactamases and mcr genes in the isolates. An overall prevalence of Salmonella of 29.0% was recorded with 63.4% (26/41) and 2.4% (1/41) of the isolates identified as S. Typhimurium and S. Dublin, respectively. The occurrence of Salmonella was higher (odd ratios: 3.3) in culled cows originating from the northeast zone of China than cows originating from the central and north zones. Twenty multi-drug resistant strains (resistant to three or more antimicrobial agents) were detected (48.8%) and overall, a high resistance to ampicillin (36/41) and tetracycline (15/41) was observed. Extended Spectrum ß-lactamases phenotypes were found in 7/41 isolates, of which all contained the blaCTX-M resistance gene, and no mcr genes were found by polymerase chain reaction. The high prevalence of Salmonella fecal carriage and antimicrobial resistance may contribute to an increased risk of Salmonella transmission to food.

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