
| 10.4049/jimmunol.1401372
http://scihub22266oqcxt.onion/10.4049/jimmunol.1401372
 C4216178!4216178!25261473
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J+Immunol 2014 ; 193 (9): 4558-67 Nephropedia Template TP
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miR-15a/16 Regulates Macrophage Phagocytosis After Bacterial Infection #MMPMID25261473Moon HG; Yang J; Zheng Y; Jin YJ Immunol 2014[Nov]; 193 (9): 4558-67 PMID25261473show ga
Bacterial infection and its associated sepsis are devastating clinical entities which lead to high mortality and morbidity in critically ill patients. Phagocytosis, along with other innate immune responses, exerts crucial impacts on the outcomes of these patients. MicroRNAs (miRNAs) are a novel class of regulatory noncoding RNAs targeting specific mRNAs for modulation of translation and expression of a targeted protein. The roles of miRNAs in host defense against bacterial sepsis remain unclear. We found that bacterial infections and/or bacterial-derived LPS enhanced the level of miR-15a/16 in bone marrow derived macrophages (BMDMs). Deletion of miR-15a/16 (miR-15a/16-/-) in myeloid cells significantly decreased the bacterial infection associated mortality in sepsis mouse models. Moreover, miR-15a/16 deficiency (miR-15a/16-/-) resulted in augmented phagocytosis and generation of mitochondrial reactive oxygen species (ROS) in BMDMs. Supportively, over-expression of miR-15a/16 using miRNA mimics led to decreased phagocytosis and decreased generation of mitochondrial ROS. Mechanistically, deletion of miR-15a/16 up-regulated the expression of toll-like receptor 4 (TLR4) via targeting the principle transcriptional regulator PU.1 locating on the promoter region of TLR4, and further modulated TLR4's downstream signaling molecules, including Rho GTPase Cdc 42 and TRAF6. Additionally, deficiency of miR-15a/16 also facilitated TLR4-mediated pro-inflammatory cytokine/chemokine release from BMDMs at the initial phase of infections. Taken together, miR-15a/16 altered phagocytosis and bacterial clearance by targeting, at least partially, on the TLR4-associated pathways, subsequently affecting the survival of septic mice.�
  
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