| First Author | Gilmour JS | Year | 2006 |
| Journal | J Immunol | Volume | 176 |
| Issue | 12 | Pages | 7605-11 |
| PubMed ID | 16751407 | Mgi Jnum | J:132352 |
| Mgi Id | MGI:3775725 | Doi | 10.4049/jimmunol.176.12.7605 |
| Citation | Gilmour JS, et al. (2006) Local amplification of glucocorticoids by 11 beta-hydroxysteroid dehydrogenase type 1 promotes macrophage phagocytosis of apoptotic leukocytes. J Immunol 176(12):7605-11 |
| abstractText | Glucocorticoids promote macrophage phagocytosis of leukocytes undergoing apoptosis. Prereceptor metabolism of glucocorticoids by 11beta-hydroxysteroid dehydrogenases (11beta-HSDs) modulates cellular steroid action. 11beta-HSD type 1 amplifies intracellular levels of active glucocorticoids in mice by reactivating corticosterone from inert 11-dehydrocorticosterone in cells expressing the enzyme. In this study we describe the rapid (within 3 h) induction of 11beta-HSD activity in cells elicited in the peritoneum by a single thioglycolate injection in mice. Levels remained high in peritoneal cells until resolution. In vitro experiments on mouse macrophages demonstrated that treatment with inert 11-dehydrocorticosterone for 24 h increased phagocytosis of apoptotic neutrophils to the same extent as corticosterone. This effect was dependent upon 11beta-HSD1, as 11beta-HSD1 mRNA, but not 11beta-HSD2 mRNA, was expressed in these cells; 11-dehydrocorticosterone was ineffective in promoting phagocytosis by Hsd11b1(-/-) macrophages, and carbenoxolone, an 11beta-HSD inhibitor, prevented the increase in phagocytosis elicited in wild-type macrophages by 11-dehydrocorticosterone. Importantly, as experimental peritonitis progressed, clearance of apoptotic neutrophils was delayed in Hsd11b1(-/-) mice. These data point to an early role for 11beta-HSD1 in promoting the rapid clearance of apoptotic cells during the resolution of inflammation and indicate a novel target for therapy. |
