[Lipiduria in the nephrotic syndrome].

Area of Science:

• Nephrology
• Clinical Chemistry
• Biochemistry

Background:

• Nephrotic syndrome (NS) is characterized by significant proteinuria and lipid metabolism disturbances.
• Understanding lipid profiles in urine and blood is crucial for diagnosing and managing kidney diseases like chronic glomerulonephritis (CGN) and renal amyloidosis.

Purpose of the Study:

• To investigate and compare urine and blood lipid fractions in patients with NS due to CGN and renal amyloidosis.
• To identify specific lipid markers associated with different nephrotic conditions.

Main Methods:

• Analysis of total lipids (TL) and lipid fractions (phospholipids (PL), free cholesterol (FC), triglycerides (TG), cholesterol esters (CE)) in blood and urine.
• Comparison between 91 NS patients (CGN and renal amyloidosis subgroups), latent CGN patients, and healthy controls.

Main Results:

• NS patients exhibited elevated blood TL, FC, and TG, with decreased PL and CE, more pronounced in amyloidosis.
• Nephrotic lipiduria was marked by increased urine TL and PL, with PL changes being more characteristic of CGN.
• Elevated lipid filtration under nephrotic hyperlipidemia contributes to high urine lipid excretion.

Conclusions:

• NS is associated with significant alterations in blood and urine lipid profiles.
• Specific lipid fraction changes in urine may help differentiate between CGN and renal amyloidosis in NS.
• Local renal production of phospholipids plays a role in nephropathies involving inflammatory and membrane-destructive processes.