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HDL Function Versus Small Dense LDL: Cardiovascular Benefits and Implications.

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High-density lipoprotein (HDL) is protective, but its function matters more than levels. Small dense low-density lipoprotein (sdLDL) is highly atherogenic, necessitating a focus on reducing apoB lipoproteins for cardiovascular health.

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Area of Science:

  • Lipid Metabolism
  • Cardiovascular Disease
  • Atherosclerosis

Background:

  • High-density lipoprotein (HDL) traditionally viewed as cardioprotective, but functionality is key.
  • Small dense low-density lipoprotein (sdLDL) particles are increasingly recognized as highly atherogenic.
  • Dyslipidemia significantly impacts cardiovascular risk and systemic inflammation.

Purpose of the Study:

  • To critically examine the roles of HDL function and sdLDL burden in cardiovascular risk.
  • To review current and emerging therapeutic interventions targeting HDL and sdLDL.
  • To analyze the shift in clinical guidelines towards apoB-driven risk reduction.

Main Methods:

  • Literature review of physiological roles, pathological implications, and therapeutic interventions.
  • Analysis of pharmacologic agents (statins, fibrates, PCSK9 inhibitors, icosapent ethyl) and lifestyle modifications.
  • Examination of current clinical guidelines and their impact on lipid management.

Main Results:

  • HDL functionality, not just concentration, is crucial for atheroprotection.
  • sdLDL particles exhibit enhanced atherogenicity due to specific properties.
  • A paradigm shift is occurring from targeting HDL-C to apoB reduction for risk management.
  • Alterations in HDL and elevated sdLDL are linked to endothelial dysfunction in heart failure (HFpEF).

Conclusions:

  • A comprehensive understanding of HDL and sdLDL dynamics is essential for optimizing cardiovascular prevention.
  • Focusing on lowering apoB-containing lipoproteins, alongside lifestyle strategies to improve HDL functionality, is recommended.
  • Further investigation into HDL-targeted therapies is ongoing, but current consensus prioritizes apoB reduction.