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Soluble LDL-recepto...
Soluble LDL-receptor is induced by TNF-α and inhibits hepatocytic clearance of LDL-cholesterol
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- Zegeye, Mulugeta M, 1986- (författare)
- Örebro universitet,Institutionen för medicinska vetenskaper,Cardiovascular Research Centre, School of Medical Sciences, Örebro University Södra Grev, Rosengatan 32, Örebro, Sweden
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- Söderberg, Stefan (författare)
- Umeå universitet,Avdelningen för medicin
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- Andersson, Jonas S.O. 1977- (författare)
- Umeå universitet,Institutionen för folkhälsa och klinisk medicin
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- Söderberg, Stefan (författare)
- Department of Public Health and Clinical Medicine, Medicine Unit, Umeå University, Umeå, Sweden
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- Ljungberg, Liza, 1980- (författare)
- Örebro universitet,Institutionen för medicinska vetenskaper,Cardiovascular Research Centre, School of Medical Sciences, Örebro University Södra Grev, Rosengatan 32, Örebro, Sweden
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- Kumawat, Ashok Kumar, 1982- (författare)
- Örebro universitet,Institutionen för medicinska vetenskaper,Cardiovascular Research Centre, School of Medical Sciences, Örebro University Södra Grev, Rosengatan 32, Örebro, Sweden
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- Sirsjö, Allan, 1959- (författare)
- Örebro universitet,Institutionen för medicinska vetenskaper,Cardiovascular Research Centre, School of Medical Sciences, Örebro University Södra Grev, Rosengatan 32, Örebro, Sweden
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- Springer, 2023
- 2023
- Engelska.
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Ingår i: Journal of Molecular Medicine. - : Springer. - 0946-2716 .- 1432-1440. ; 101:12, s. 1615-1626
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Abstract
Ämnesord
Stäng
- Defective LDL-C clearance and hence its elevation in the circulation is an established risk factor for cardiovascular diseases (CVDs) such as myocardial infarction (MI). A soluble LDL-receptor (sLDL-R) has been detected in human plasma which correlates strongly with circulating LDL-C and classical conditions that promote chronic inflammation. However, the mechanistic interplay between sLDL-R, inflammation, and CVDs remains to be investigated. Here, we report that stimulation of HepG2 cells with TNF-α induces the release of sLDL-R into culture supernatants. In addition, TNF-α induces gene expression of peptidases ADAM-17 and MMP-14 in HepG2 cells, and inhibiting these peptidases using TMI 1 significantly reduces the TNF-α induced sLDL-R release. We found that a soluble form of recombinant LDL-R (100 nM) can strongly bind to LDL-C and form a stable complex (KD = E-12). Moreover, incubation of HepG2 cells with this recombinant LDL-R resulted in reduced LDL-C uptake in a dose-dependent manner. In a nested case-control study, we found that baseline sLDL-R in plasma is positively correlated with plasma total cholesterol level. Furthermore, a twofold increase in plasma sLDL-R was associated with a 55% increase in the risk of future MI [AOR = 1.55 (95% CI = 1.10-2.18)]. Nevertheless, mediation analyses revealed that a significant proportion of the association is mediated by elevation in plasma cholesterol level (indirect effect β = 0.21 (95% CI = 0.07-0.38). Collectively, our study shows that sLDL-R is induced by a pro-inflammatory cytokine TNF-α via membrane shedding. Furthermore, an increase in sLDL-R could inhibit hepatic clearance of LDL-C increasing its half-life in the circulation and contributing to the pathogenesis of MI. KEY MESSAGES: TNF-α causes shedding of hepatocytic LDL-R through induction of ADAM-17 and MMP-14. sLDL-R binds strongly to LDL-C and inhibits its uptake by hepatocytic cells. Plasma sLDL-R is positively correlated with TNF-α and cholesterol. Plasma sLDL-R is an independent predictor of myocardial infarction (MI). Plasma cholesterol mediates the association between sLDL-R and MI.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Kardiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Cardiac and Cardiovascular Systems (hsv//eng)
Nyckelord
- ADAM-17
- Chronic inflammation
- Hypercholesterolemia
- MMP-14
- Mediation analyses
- Myocardial infarction
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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