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TL;DR
This laboratory study used human renal cell lines to show that VHL deficiency leads to a state of reductive stress, characterized by an increased NADH/NAD+ ratio and impaired mitochondrial respiration.
Free Radical Biology & Medicine · 15 authors, 6 centres
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This laboratory study used human renal cell lines to show that VHL deficiency leads to a state of reductive stress, characterized by an increased NADH/NAD+ ratio and impaired mitochondrial respiration.
This study used human-derived renal proximal tubular cells (HKC-8) and their VHL-deficient counterparts as in vitro models to investigate metabolic alterations in clear-cell renal cell carcinoma. The central result is that VHL deficiency leads to reductive stress, evidenced by an increased NADH/NAD+ ratio, decreased cellular respiration, and increased lipid droplet accumulation. The researchers demonstrated that this reductive stress was glucose-dependent and could be alleviated by agents like pyruvate and resazurin, which normalized the NADH/NAD+ ratio and restored respiration. The study is a preclinical, cell-line based investigation. Key limitations include its reliance on a single cell line model, requiring future validation in animal models and patient samples to confirm relevance to the human disease.