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Kidney, Renal Tubule - Regeneration

Image of renal tubule regeneration in the kidney from a male rat in an acute study
Kidney, Renal tubule - Regeneration in a male rat from an acute study. Regeneration following acute tubule epithelial injury is characterized by flattened epithelium and tubule epithelial cell basophilia and is accompanied by nuclear crowding.
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Image of renal tubule regeneration in the kidney from a male P53 +/- (C57BL/6) mouse in a subchronic study
Kidney, Renal tubule - Regeneration in a male P53 +/- (C57BL/6) mouse from a subchronic study. Following an acute phase of tubule injury, regeneration is characterized by tubule basophilia, nuclear crowding, and increased mitoses.
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comment:

Renal tubule regeneration occurs as a reparative response to previous degeneration and/or necrosis of renal tubular epithelium. It is one of the most common test-article-related lesions observed in the kidney. Regeneration is characterized by a spectrum of histologic changes, including cytoplasmic basophilia, karyomegaly, and nuclear crowding along the affected tubule segment ( Figure 1image opens in a pop-up window and Figure 2image opens in a pop-up window ). In contrast to chronic progressive nephropathy (CPN), thickened basement membranes are generally not a feature with chemically induced injury and regeneration. Mitotic figures are variable. However, the determination of chemically mediated regeneration can be confounded by the presence of CPN and may be difficult for the toxicologic pathologist to distinguish.

recommendation:

Regeneration should be diagnosed and given a severity grade. Tubule regeneration accompanying CPN-related regeneration should not be diagnosed separately but should be included in the diagnosis of CPN. If necrosis is significant, it may be diagnosed concurrently. The difference between hyperplasia and regeneration can be problematic, and the pathologist must use his or her judgment in differentiating these lesions.

references:

Cuppage FE, Tate A. 1967. Repair of the nephron following injury with mercuric chloride. Am J Pathol 51:405-429.
Full Text: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1965336/

Dube PH, Almanzar MM, Frazier KS, Paredes AI. 2004. Osteogenic protein-1 (rhOP-1) treatment induces tubular regeneration in the acute and chronic phases of the rat remnant kidney model. Toxicol Pathol 32:382-394.

Toback FG. 1992. Regeneration after acute tubular necrosis. Kidney Int 41:226-246.
Abstract: http://www.ncbi.nlm.nih.gov/pubmed/1593859

Van de Water B, Imamdi R, de Graauw M. 2005. Signal transduction in renal cell repair and regeneration. In: Toxicology of the Kidney, 3rd ed (Tarloff JB, Lash LH, eds). CRC Press, Boca Raton, FL, 299341.

NTP is located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.