| First Author | Sharma D | Year | 2014 |
| Journal | Am J Pathol | Volume | 184 |
| Issue | 8 | Pages | 2297-309 |
| PubMed ID | 24946011 | Mgi Jnum | J:213559 |
| Mgi Id | MGI:5585330 | Doi | 10.1016/j.ajpath.2014.05.002 |
| Citation | Sharma D, et al. (2014) Nonhematopoietic beta-Arrestin-1 inhibits inflammation in a murine model of polymicrobial sepsis. Am J Pathol 184(8):2297-309 |
| abstractText | beta-Arrestin-1 (betaArr1), a scaffolding protein critical in G-protein coupled receptor desensitization has more recently been found to be important in the pathogenesis of various inflammatory diseases. We sought to understand the role of betaArr1 in sepsis pathogenesis using a mouse model of polymicrobial sepsis. Although in previous studies we established that betaArr1 deficiency protects mice from endotoxemia, here we demonstrate that the absence of betaArr1 remarkably renders mice more susceptible to mortality in polymicrobial sepsis. In accordance with the mortality pattern, early production of inflammatory mediators was markedly enhanced in betaArr1 knockout mice systemically and locally in various organs. In addition, enhanced inflammation in the heart was associated with increased NFkappaB activation. Compared to these effects, immune cell infiltration, thymic apoptosis, and immune suppression during polymicrobial sepsis were unaffected by a deficiency of betaArr1. Additionally, enhanced inflammation and consequent higher mortality were not observed in heterozygous mice, suggesting that one allele of betaArr1 was sufficient for this protective negative regulatory role. We further demonstrate that, unexpectedly, betaArr1 in nonhematopoietic cells is critical and sufficient for inhibiting sepsis-induced inflammation, whereas hematopoietic betaArr1 is likely redundant. Taken together, our results reveal a novel and previously unrecognized negative regulatory role of the nonhematopoietic betaArr1 in sepsis-induced inflammation. |
