Ex Vivo Hyperpolarized MR Spectroscopy on Isolated Renal Tubular Cells: A Novel Technique for Cell Energy Phenotyping

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Purpose:It has been demonstrated that hyperpolarized 13C MR is a useful tool to study cultured cells. However, cells in culture can alter phenotype, which raises concerns regarding the in vivo significance of such findings. Here we investigate if metabolic phenotyping using hyperpolarized 13C MR is suitable for cells isolated from kidney tissue, without prior cell culture.Methods:Isolation of tubular cells from freshly excised kidney tissue and treatment with either ouabain or antimycin A was investigated with hyperpolarized MR spectroscopy on a 9.4 Tesla preclinical imaging system.Results:Isolation of tubular cells from less than 2 g of kidney tissue generally resulted in more than 10 million live tubular cells. This amount of cells was enough to yield robust signals from the conversion of 13C-pyruvate to lactate, bicarbonate and alanine, demonstrating that metabolic flux by means of both anaerobic and aerobic pathways can be quantified using this technique.Conclusion:Ex vivo metabolic phenotyping using hyperpolarized 13C MR in a preclinical system is a useful technique to study energy metabolism in freshly isolated renal tubular cells. This technique has the potential to advance our understanding of both normal cell physiology as well as pathological processes contributing to kidney disease.

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