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Quantitation of alpha2u-globulin in rat kidney cytosol by capillary electrophoresis
A Pähler1, K Blumbach, J Herbst
1Institut für Toxikologie, Universität Würzburg, Versbacher Strasse 9, Würzburg, 97078, Germany.
Abstract:
The renal accumulation of alpha2u-globulin has been implicated in the tumorigenicity of many nongenotoxic chemicals to the kidney of the male rat. Several chemicals inducing renal tumors in the male rat were shown to bind to alpha2u-globulin. This binding impairs the renal degradation of alpha2u-globulin, resulting in lysosomal overload, cell death, increased cell proliferation, and, presumably, renal tumor formation. To support the role of alpha2u-globulin accumulation in the renal toxicity of a chemical, a demonstration of the accumulation of this protein in the kidney of the male rat is one prerequisite. Monoclonal antibodies to alpha2u-globulin are available for quantifying alpha2u-globulin content; however, the procedure is time-consuming and complicated. We developed a method for the quantitation of alpha2u-globulin in renal cytosol using capillary electrophoresis. Renal cytosol fractions were analyzed by capillary electrophoresis as protein-SDS complexes. Using alpha2u-globulin purified from urine of male rats, the limit of detection was 10 microg/ml sample in routine analyses. Excellent run to run reproducibility in migration time (CV
Insights
A new capillary electrophoresis method quantifies alpha2u-globulin accumulation in male rat kidneys. This protein
Area of Science:
- Toxicology
- Biochemistry
- Analytical Chemistry
Background:
- Alpha2u-globulin accumulation in male rat kidneys is linked to chemical-induced renal tumors.
- This accumulation impairs protein degradation, leading to cell death and proliferation.
- Quantifying alpha2u-globulin is crucial for assessing chemical renal toxicity but existing methods are complex.
Purpose of the Study:
- To develop a simpler, faster, and reproducible method for quantifying alpha2u-globulin in rat kidney cytosol.
- To validate the new method's accuracy and reliability for assessing chemical-induced renal toxicity.
Main Methods:
- Developed a capillary electrophoresis (CE) method to quantify alpha2u-globulin in rat renal cytosol as protein-SDS complexes.
- Analyzed samples from rats treated with known alpha2u-globulin nephropathy-inducing agents and controls.
- Validated CE results against immunoblotting using an alpha2u-globulin-specific antibody.
Main Results:
- The CE method demonstrated a detection limit of 10 microg/ml with high reproducibility (migration time CV ≤4%, peak area CV ≤3%).
- Significant increases in renal alpha2u-globulin were observed in rats treated with trimethylpentane and certain alkylphosphonates.
- CE results showed excellent correlation (r² = 0.997) with immunoblotting data.
Conclusions:
- Capillary electrophoresis offers a simple, rapid, and reproducible method for quantifying alpha2u-globulin accumulation in rat kidneys.
- This method can aid in identifying chemicals that cause renal tumors via alpha2u-globulin accumulation.
- The technique supports improved risk assessment for male rat kidney tumorigens.
