alexa Mesenchymal stem cells prevent progressive experimental renal failure but maldifferentiate into glomerular adipocytes.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Stem Cell Research & Therapy

Author(s): Kunter U, Rong S, Boor P, Eitner F, MllerNewen G,

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Abstract Glomerulonephritis (GN) is a major cause of renal failure. This study sought to determine whether intrarenal injection of rat mesenchymal stem cells (MSC) can preserve renal function in a progressive rat model of GN. Early in GN (day 10), fluorescently labeled rat MSC localized to more than 70\% of glomeruli, ameliorated acute renal failure, and reduced glomerular adhesions. Fifty days later, proteinuria had progressed in controls to 40 +/- 25 mg/d but stayed low in MSC-treated rats (13 +/- 4 mg/d; P < 0.01). Renal function on day 60 in the MSC group was better than in medium controls. Kidneys of the MSC group as compared with controls on day 60 contained 11\% more glomeruli per 1-mm(2) section of cortex but also significantly more collagen types I, III, and IV and alpha-smooth muscle actin. Approximately 20\% of the glomeruli of MSC-treated rats contained single or clusters of large adipocytes with pronounced surrounding fibrosis. Adipocytes exhibited fluorescence in their cytoplasm and/or intracellular lipid droplets. Lipid composition in these adipocytes in vivo mirrored that of MSC that underwent adipogenic differentiation in vitro. Thus, in this GN model, the early beneficial effect of MSC of preserving damaged glomeruli and maintaining renal function was offset by a long-term partial maldifferentiation of intraglomerular MSC into adipocytes accompanied by glomerular sclerosis. These data suggest that MSC treatment can be a valuable therapeutic approach only if adipogenic maldifferentiation is prevented. This article was published in J Am Soc Nephrol and referenced in Journal of Stem Cell Research & Therapy

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