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- W4200548591 abstract "Monocytes and macrophages are early sentinels of infection. The peritoneum contains two resident populations: large and small peritoneal macrophages (LPMs and SPMs). While LPMs self-renew, circulating monocytes enter the peritoneum and differentiate into SPMs. We lack information on the dynamics of monocyte-macrophage trafficking during abdominal sepsis, reflecting an important knowledge gap. In this study, we characterize the presence of LPMs, SPMs, and monocytes in the peritoneum of mice following cecal ligation and puncture (CLP)-induced sepsis and sham surgery. LPMs rapidly disappeared from the peritoneum and were scarce at 18-66 h after CLP or sham surgery. By 14 d, LPMs returned for sham mice, but they remained scarce in CLP mice. Depletion of LPMs from the peritoneum of CD11b-DTR mice greatly increased animal mortality. These data imply that LPMs are critical for sepsis survival. Monocytes rapidly infiltrated the peritoneum and were abundant at 18-66 h after CLP or sham surgery. Surprisingly, SPMs only increased at 14 d post-CLP. Therefore, monocytes may defend hosts from acute sepsis mortality without generating SPMs. More monocytes were present in mice predicted to survive sepsis versus mice predicted to die. However, altering monocyte numbers via CCR2 deficiency or adoptive transfer did not significantly affect animal survival. We reasoned that animals destined to survive sepsis may exhibit a different monocyte phenotype, rather than merely enhanced numbers. Indeed, mice predicted to survive possessed more CD31+, CXCR4hi transitional premonocytes in their abdomen. Inhibition of CXCL12-CXCR4 signaling via AMD3100 exacerbated sepsis. These data imply that recruitment of transitional premonocytes to the abdomen promotes sepsis survival." @default.
- W4200548591 created "2021-12-31" @default.
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- W4200548591 date "2021-12-01" @default.
- W4200548591 modified "2023-10-02" @default.
- W4200548591 title "Large Peritoneal Macrophages and Transitional Premonocytes Promote Survival during Abdominal Sepsis" @default.
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- W4200548591 doi "https://doi.org/10.4049/immunohorizons.2100086" @default.
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