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Determinants of VLDL-triglycerides production
1Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark.
Current Opinion in Lipidology
|May 24, 2012
Summary
Hepatic VLDL-TG production is complex, not solely driven by free fatty acids (FFA). Hormonal and nutritional factors, alongside hepatic fatty acid handling, intricately regulate VLDL-TG production.
Area of Science:
- Metabolism and Endocrinology
- Lipid Metabolism
- Hepatic VLDL-Triglyceride Production
Background:
- Plasma free fatty acids (FFA) are recognized as primary substrates for hepatic very-low-density lipoprotein-triglycerides (VLDL-TG) production.
- A prevailing view posits that VLDL-TG production is a substrate-driven process, mainly dictated by systemic FFA delivery.
Purpose of the Study:
- To review recent research elucidating the complex regulation of hepatic VLDL-TG production.
- To challenge the simplistic notion that VLDL-TG production is solely determined by FFA availability.
Main Methods:
- Review of recent scientific literature and studies.
- Analysis of data concerning FFA flux, exercise, insulin resistance, hyperinsulinemia, glucagon, and sex hormones in relation to VLDL-TG production.
Main Results:
- Increased FFA flux does not always correlate with increased VLDL-TG production; exercise can increase FFA flux without altering VLDL-TG production.
- Hepatic VLDL-TG production increases precede impaired glucose production regulation in insulin resistance.
- Isolated hyperinsulinemia (insulinoma) does not elevate VLDL-TG production; insulin acutely suppresses VLDL-TG production, while glucagon reduces it.
- Sex hormones (estrogen, testosterone) exhibit minimal impact on VLDL-TG production.
Conclusions:
- Hepatic VLDL-TG production is regulated by a complex interplay of systemic FFA delivery, hormonal influences, nutritional status, and hepatic fatty acid handling.
- Current understanding of these regulatory mechanisms is incomplete and warrants further investigation.
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