Kidneys: key modulators of high-density lipoprotein levels and function

Area of Science:

• Nephrology
• Cardiovascular Metabolism
• Lipid Biochemistry

Background:

• High-density lipoprotein (HDL) plays a crucial role in reverse cholesterol transport.
• Kidney function is increasingly recognized to influence systemic lipid profiles.
• Understanding the kidney's role in HDL metabolism is vital for cardiovascular and renal health.

Purpose of the Study:

• To review current knowledge on the kidney's role in high-density lipoprotein (HDL) metabolism.
• To examine how renal processes affect HDL particle levels, composition, and functionality.
• To explore the potential of HDL changes as biomarkers for kidney damage.

Main Methods:

• Literature review of studies investigating kidney-HDL interactions.
• Analysis of data on HDL component filtration, reabsorption, and degradation in renal tubules.
• Examination of evidence linking renal injury to alterations in plasma and urinary HDL.

Main Results:

• HDL components, including apolipoproteins and enzymes, cross the glomerular barrier.
• Proximal tubules process HDL components through degradation, modification, or salvage.
• Renal injury impacts intrarenal HDL processing, altering HDL in circulation and urine.

Conclusions:

• The kidneys play a critical role in modulating HDL levels, composition, and function.
• Alterations in intrarenal HDL metabolism can serve as indicators of kidney damage.
• Kidney-specific HDL changes may contribute to or reflect kidney disease pathophysiology.