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Review
. 2015 Apr 1;36(13):774-6.
doi: 10.1093/eurheartj/ehu500. Epub 2014 Dec 29.

Triglycerides on the rise: should we swap seats on the seesaw?

Affiliations
Review

Triglycerides on the rise: should we swap seats on the seesaw?

Peter Libby. Eur Heart J. .
No abstract available

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Figures

Figure 1
Figure 1
The high-density lipoprotein/triglyceride seesaw. High-density lipoprotein and triglycerides tend to vary inversely. Traditional thought has focused on the benefits of raising high-density lipoprotein and high-density lipoprotein as a protective factor for atherosclerosis. Triglycerides have received less attention as a causal risk factor as adjustment for high-density lipoprotein attenuates its association with risk. The new clinical and genetic data described in this commentary indicate that triglycerides and specifically the apolipoprotein constituent of many triglyceride-rich lipoproteins, apolipoprotein C3, may actually lie in the causal pathway for atherosclerosis. Thus, contrary to common belief, the current data suggest that we should focus more on triglyceride-rich lipoproteins as a target for cardiovascular risk reduction.
Figure 2
Figure 2
Apolipoprotein C3 regulates triglyceride-rich lipoprotein concentrations and can promote inflammation. The figure depicts very low-density lipoprotein as a prototypical triglyceride-rich lipoprotein. The single equatorial apolipoprotein B moiety encircles the particle. Apolipoprotein constituents associated with a sub-population of triglyceride-rich lipoproteins include apolipoprotein E (a key ligand for the low-density lipoprotein receptor) and apolipoprotein C3, implicated in atherogenesis by a variety of observational, in vitro, and genetic studies as discussed. In particular, apolipoprotein C3 can inhibit lipoprotein lipase preventing the catabolism of triglyceride-rich lipoproteins and raise their steady-state concentration due to a decrease in lipolysis. Apolipoprotein C3 can also inhibit the uptake of triglyceride-rich lipoprotein particles by remnant lipoprotein receptors, for example expressed on the surface of the hepatocyte as depicted. This inhibition of peripheral uptake of triglyceride-rich lipoproteins will conspire with the reduced lipolysis to increase further the concentration of triglyceride-rich lipoproteins in the plasma. In addition to these alterations in the metabolism of triglyceride-rich lipoproteins, apolipoprotein C3 may have direct proinflammatory effects, for example the induction of vascular cell adhesion molecule-1, an endothelial-leucocyte adhesion molecule implicated in recruitment of monocytes, the precursor of foam cells in the atherosclerotic plaque and contributors to ongoing inflammation implicated in plaque evolution and complication.

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