ArticleClinical and experimental nephrology2026
Red yeast rice supplement containing silica nanoparticles induces renal injury in rats with unilateral nephrectomy.
Article in Clinical and experimental nephrology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundAcute kidney injury (AKI) caused by red yeast rice Cholestehelp® (CP) tablets has become a public health issue in Japan. Puberulic acid (PA) contaminated in CP tablets may cause AKI; however, we detected silica nanoparticles in a CP patient. CP-related kidney injury was examined in rats that underwent left nephrectomy to increase silica nanoparticle loading.
methodsSix male Sprague-Dawley rats were administered CP and underwent left nephrectomy on day 4. Blood and urine samples were collected on day 11. Renal tissues were observed by electron microscopy and low-vacuum scanning electron microscopy-energy dispersive X-ray spectroscopy (LVSEM-EDS). The amount of PA in CP was measured, and PA was administered to normal rats and unilaterally nephrectomized rats.
resultsNormal rats receiving CP (2KCP) had increased urine volume and lower urine specific gravity than controls, but no significant changes were observed in urinary protein, renal function, electrolytes, or blood gasses. Unilaterally nephrectomized rats receiving CP (1KCP) had increased water intake and urine volume, decreased urine specific gravity, and increased low-molecular-weight proteinuria. The glomeruli of 1KCP rats showed expanded subendothelial space and increased endocytic vesicles were observed in the proximal tubules relative to 2KCP rats. The accumulation of nanoparticles in the endosomes of the proximal tubules, and LVSEM-EDS detected silicon in renal tissue. Administration of PA at the doses in CP tablet did not result in significant renal injury.
conclusionsUninephrectomized rats administered CP tablets showed accumulation of silicon-containing nanoparticles in the proximal tubules and renal injury.
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