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. 1989 Oct;135(4):657–662.

Cell deletion by apoptosis during regression of renal hyperplasia.

G M Ledda-Columbano 1, A Columbano 1, P Coni 1, G Faa 1, P Pani 1
PMCID: PMC1880037  PMID: 2552812

Abstract

Regression of renal hyperplasia after withdrawal of the mitogenic stimulus induced by a single injection of lead nitrate was studied in male Wistar rats. Lead nitrate administration (10 mumol/100 g body weight) resulted in a ninefold increase in the incorporation of labeled thymidine into renal DNA and in an enhancement in the mitotic index; these changes were accompanied by an increase in the organ weight and DNA content that reached a maximum at 2 days. Regression of the renal hyperplasia was observed as early as 3 days after treatment and was completed within 2 weeks. Although lytic necrosis was not responsible for cell loss, the elimination of the excess renal cells took the form of apoptosis. This distinctive mode of cell death, which has been implicated in the involution of hyperplasia in other tissues and organs, was characterized by the occurrence of intracellular and extracellular membrane-bounded eosinophilic globules that often contained nuclear fragments. It affected mainly cells of the proximal tubules, and it was not detected once the kidney had regressed to its original mass. These results support the hypothesis that apoptosis is involved in the regulation of organ size.

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Selected References

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