Nephrological factors may cause kidney dysfunction in patients with common variable immunodeficiency

Area of Science:

• Immunology
• Nephrology
• Internal Medicine

Background:

• Common variable immunodeficiency (CVID) is a primary immunodeficiency associated with infections, autoimmune diseases, malignancy, and chronic inflammation.
• Proteinuria is a significant prognostic factor for kidney disease progression, contributing to tubulotoxicity and fibrosis.
• Limited data exists on the interplay between inflammation and nephropathy in CVID patients.

Purpose of the Study:

• To investigate the relationship between tubular dysfunction, proteinuria, and inflammation in patients with CVID.
• To identify potential markers of kidney involvement in CVID.

Main Methods:

• A cross-sectional study included 27 CVID patients and 18 healthy controls.
• Kidney function tests, including 24-h urine proteinuria, were performed.
• Flow cytometry was used to analyze peripheral NK and T cell subsets (CD56, CD16, CD3, CD4, CD8).

Main Results:

• CVID patients exhibited higher urinary density, fractional excretion of sodium, proteinuria, and metabolic acidosis compared to controls.
• Proteinuria positively correlated with age and CD8+ T cell percentage.
• Albumin, CRP, and CD8+ T cell percentage were independent predictors of proteinuria.

Conclusions:

• Elevated chronic inflammation is associated with proteinuria in CVID patients.
• Proteinuria should be closely monitored in CVID patients during routine clinical care to prevent nephropathy progression.