Cystatin C: a useful marker of glomerulopathy in sickle cell disease?

Area of Science:

• Nephrology
• Hematology
• Biochemistry

Background:

• Renal dysfunction is a major complication in sickle cell disease (SCD).
• Accurate assessment of kidney function is crucial for managing SCD patients.
• Cystatin C (Cys-C) is an emerging biomarker for renal function in various populations.

Purpose of the Study:

• To evaluate the utility of Cystatin C (Cys-C) as a marker for renal function in adults with sickle cell anemia (SCA).
• To assess the correlation of Cys-C with measured glomerular filtration rate (GFR) and other clinical parameters in SCA patients.

Main Methods:

• A study involving 98 adults with homozygous sickle cell disease (SCD).
• Measurements included hematological and biochemical parameters (including Cys-C).
• Glomerular filtration rate (GFR) was measured using a 99mTc-DTPA nuclear renal scan.

Main Results:

• Mean measured GFR was 94.9±27.4 mL/min/1.73m²; mean Cys-C level was 0.80±0.78 mg/L.
• Cys-C showed significant correlations with measured GFR (r=-0.61), hemoglobin (r=-0.32), serum creatinine (r=0.91), urine ACR (r=0.79), and systolic blood pressure (r=0.38).
• The Cys-C-based CKD-EPI equation demonstrated the best agreement compared to other creatinine-based and Cys-C-based equations.

Conclusions:

• Cystatin C (Cys-C) is strongly associated with GFR and albuminuria in sickle cell anemia (SCA) patients.
• Cys-C may serve as a valuable screening tool for renal dysfunction in this population.
• Further research can validate Cys-C for routine clinical use in SCA management.