TY  - JOUR
TI  - Malat1 regulates PMN-MDSC expansion and immunosuppression through p-STAT3 ubiquitination in sepsis
AV  - public
Y1  - 2024///
EP  - 1546
KW  - Experimental sepsis
KW  -  Polymorphonuclear myeloid-derived suppressor cell
KW  -  Malat1
KW  -  STAT3 pathway
KW  -  Ubiquitination
N2  - Myeloid-derived suppressor cells (MDSCs) expand during sepsis and contribute to the development of persistent inflammation-immunosuppression-catabolism syndrome. However, the underlying mechanism remains unclear. Exploring the mechanisms of MDSCs generation may provide therapeutic targets for improving immune status in sepsis. Here, a sepsis mouse model is established by cecal ligation and perforation. Bone marrow cells at different sepsis time points are harvested to detect the proportion of MDSCs and search for differentially expressed genes by RNA-sequence. In lethal models of sepsis, polymorphonuclear-MDSCs (PMN-MDSCs) decrease in early but increase and become activated in late sepsis, which is contrary to the expression of metastasis-associated lung adenocarcinoma transcript 1 (Malat1). In vivo, Malat1 inhibitor significantly increases the mortality in mice with late sepsis. And in vitro, Malat1 down-regulation increases the proportion of PMN-MDSCs and enhanced its immunosuppressive ability. Mechanistically, Malat1 limits the differentiation of PMN-MDSCs by accelerating the degradation of phosphorylated STAT3. Furthermore, Stattic, an inhibitor of STAT3 phosphorylation, improves the survival of septic mice by inhibiting PMN-MDSCs. Overall, the study identifies a novel insight into the mechanism of sepsis-induced MDSCs and provides more evidence for targeting MDSCs in the treatment of sepsis.
ID  - discovery10187631
PB  - Ivyspring International Publisher
IS  - 4
N1  - ©2024 Ivyspring International Publisher. This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/).
SP  - 1529
VL  - 20
JF  - International Journal of Biological Sciences
A1  - Wang, Yaodong
A1  - Zhang, Caiyan
A1  - Liu, Tingyan
A1  - Yu, Zhenhao
A1  - Wang, Kexin
A1  - Ying, Jiayun
A1  - Wang, Yao
A1  - Zhu, Ting
A1  - Li, Jingjing
A1  - Hu, Xiuchuan Lucas
A1  - Zhou, Yufeng
A1  - Lu, Guoping
UR  - http://dx.doi.org/10.7150/ijbs.92267
ER  -