Clusterin expression and apoptosis in tissue remodeling associated with renal regeneration.

Abstract:

:To analyze the role of clusterin in renal diseases involving a regenerative process, we have used a novel rodent model to compare temporal and spatial expression of clusterin mRNA. Thus, renal artery stenosis was used to induce unilateral non-infarctive renal atrophy. After several weeks, when cellular pathology of atrophic kidneys involved minimal apoptosis or inflammatory response and mitosis was at normal levels, regeneration of atrophic kidneys was stimulated by removal of the contralateral healthy kidneys. The regrowth response was very rapid and involved renal hyperplasia rather than hypertrophy. Regenerating kidneys were studied 0, 4, 8, 24 hours and 2, 3, 5, 7, and 14 days after contralateral nephrectomy. Several parameters were compared: level and localization of clusterin mRNA; cell proliferation; cell dedifferentiation and redifferentiation and apoptosis. During the acute regenerative phase (first 24 hr) clusterin expression was markedly increased, decreasing to untraceable levels by five days of regeneration. Clusterin mRNA was localized in dilated or collapsed atrophic tubules that had lost identifying surface structures of normal tubular epithelium (termed dedifferentiated). Clusterin was also localized in the periphery of some blood vessel walls. Cell proliferation peaked at three to five days of regeneration, and was also localized in dedifferentiated tubules. Despite the regenerative stimulus, an unexpected result was a transient but marked increase in apoptotic cell death in atrophic tubules in the first 24 hours of regeneration. Our results provide evidence of a temporal association between increased clusterin expression and apoptosis, but in situ localization showed clusterin mRNA over apparently viable, as well as apoptotic, cells in the epithelium of tubules showing clusterin expression. Clusterin mRNA was rarely identified over epithelial cells in foci of non-atrophic (non-dedifferentiated) nephrons that responded to the regenerative stimulus by cellular hypertrophy. The dramatic response after initiation of regeneration, especially the initiation of apoptosis in the tubular epithelium, may have applications for the study of genetic changes leading to renal oncogenesis.

journal_name

Kidney Int

journal_title

Kidney international

authors

Gobé GC,Buttyan R,Wyburn KR,Etheridge MR,Smith PJ

doi

10.1038/ki.1995.54

subject

Has Abstract

pub_date

1995-02-01 00:00:00

pages

411-20

issue

2

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)58818-2

journal_volume

47

pub_type

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