Elevated free cholesterol levels due to impaired reverse cholesterol transport are a risk factor for polymicrobial sepsis in mice

被引:1
|
作者
Wang, Qian [1 ]
Guo, Ling [1 ]
Hao, Dan [1 ]
Ito, Misa [1 ]
Mineo, Chieko [2 ]
Shaul, Philip W. [2 ]
Li, Xiang-An [1 ,3 ,4 ]
机构
[1] Univ Kentucky, Saha Cardiovasc Res Ctr, Lexington, KY 40506 USA
[2] Univ Texas SouthWestern Med Ctr, Dept Pediat, Dallas, TX USA
[3] Lexington VA Healthcare Syst, Lexington, KY 40506 USA
[4] Univ Kentucky, Dept Physiol, Lexington, KY 40506 USA
关键词
RECEPTOR-CLASS-B; SCAVENGER RECEPTOR; SR-BI; CARDIOVASCULAR-DISEASE; STATIN THERAPY; PROTECTS; PROBUCOL; METABOLISM; MORTALITY; SHOCK;
D O I
10.1016/j.jbc.2024.107974
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Dysregulated lipid metabolism is commonly observed in septic patients, but how it contributes to sepsis remains largely unknown. Reverse cholesterol transport (RCT) is crucial for regulating cholesterol metabolism in circulation. During RCT, high-density lipoprotein collects cholesterol from peripheral tissues and transports it to the liver's scavenger receptor BI (SR- BI), where SR-BI mediates the uptake of cholesteryl esters (CEs) from high-density lipoprotein for excretion via bile. In this study, we utilized AlbCreSR-BIfl/fl mice, a model with impaired RCT, to investigate the impact of RCT on sepsis. We found that AlbCreSR-BIfl/fl mice were significantly more susceptible to cecal ligation and puncture (CLP)-induced polymicrobial sepsis, with a survival rate of 14.3% compared to 80% in SR-BIfl/fl littermates. Mechanistically, sepsis disrupted cholesterol metabolism, causing a 4.8-fold increase in free cholesterol (FC) levels and a 4fold increase in the FC/CE ratio in AlbCreSR-BIfl/fl mice compared to SR-BIfl/fl littermates. This disruption led to hemolysis and death. Notably, administering the cholesterol-lowering drug probucol normalized FC levels and the FC/CE ratio, and significantly improved survival in CLP-AlbCreSR-BIfl/fl mice. However, probucol treatment reduced survival in CLP-lowdensity lipoprotein receptor knockout mice, which had elevated CE levels with a low FC/CE ratio. These results highlight that elevated FC levels with high FC/CE ratio are a risk factor for sepsis. Therefore, selectively targeting elevated FC levels and FC/ CE ratio could be a promising therapeutic strategy for managing sepsis.
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页数:9
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