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[Oxalate influx rate in red blood cells in calcium oxalate nephrolithiasis]
T Kato1, K Yamakawa, J Kawamura
1Department of Urology, Mie University, School of Medicine.
Insights
Researchers developed a method to measure oxalate influx into red blood cells. Patients with kidney stones showed higher oxalate influx compared to controls, suggesting a potential mechanism for stone formation.
Area of Science:
- Biochemistry
- Physiology
- Nephrology
Context:
- Recurrent calcium oxalate nephrolithiasis is a common clinical problem.
- Understanding the mechanisms of oxalate transport is crucial for preventing kidney stone formation.
- Red blood cells offer a model system for studying cellular oxalate uptake.
Purpose:
- To establish a reliable method for quantifying human red blood cell oxalate influx.
- To compare oxalate influx rates between patients with recurrent calcium oxalate nephrolithiasis and healthy controls.
- To investigate the role of band 3 protein in mediating oxalate transport.
Summary:
- A novel method for measuring human red blood cell oxalate influx under steady-state exchange conditions was developed.
- Oxalate transport across the red blood cell membrane was found to be mediated by band 3 protein, as evidenced by DIDS inhibition.
- Oxalate influx rates were significantly higher in patients with nephrolithiasis compared to controls, particularly at 0°C.
- The influx rate is dependent on temperature and pH, with optimal measurement conditions identified.
Impact:
- This study identifies a potential biomarker for calcium oxalate nephrolithiasis.
- The findings provide insights into the cellular mechanisms underlying kidney stone disease.
- The developed method can be used for further research into oxalate transport and related disorders.
Abstract:
We established a method of human red blood cell oxalate influx rate under the condition of steady state exchange. Using this method we measured the influx rate in 10 patients with recurrent calcium oxalate nephrolithiasis and in 18 controls. DIDS inhibited oxalate flux across the human red blood cell membrane. This result suggested that band 3 protein mediates oxalate transport. Oxalate influx rate depended on reaction temperature and pH of reaction buffer. Although the oxalate influx rate in 4 degrees C could not be determined under an initial condition rate, the measurable condition was in 0 degrees C of reaction temperature. Consequently we measured the oxalate influx rate under the condition of 0 degrees C reaction temperature and 20 ml volume of washing buffer. The mean oxalate influx rate was significantly higher in patients with nephrolithiasis than in controls (-1.00 +/- 0.19 vs. -0.78 +/- 0.14).