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Experimental chronic renal ischemia: morphologic and immunologic studies.
L D Truong1, A Farhood, J Tasby
1Department of Pathology, Methodist Hospital, Houston, Texas.
Kidney International
|June 1, 1992
Summary
Renal artery stenosis in rats induced chronic tubulointerstitial nephritis, characterized by inflammation and altered tubular epithelium. Ischemia alone can cause these changes, potentially triggering immune responses and leading to kidney disease.
Area of Science:
- Nephrology
- Pathology
- Immunology
Background:
- Chronic tubulointerstitial nephritis (CTIN) pathogenesis remains unclear.
- Previous studies have not fully characterized morphologic, ultrastructural, or immunologic changes in ischemic kidneys.
Purpose of the Study:
- To investigate the effects of unilateral renal artery stenosis on kidney tissue.
- To characterize the structural, antigenic, and inflammatory changes in ischemic kidneys.
- To explore the role of ischemia in the development of CTIN.
Main Methods:
- Unilateral renal artery stenosis was induced in Sprague-Dawley rats for 28 days.
- Histological, ultrastructural, immunofluorescent, and morphometric analyses were performed.
- Immunohistochemistry was used to assess specific proteins and inflammatory cell markers.
Main Results:
- Ischemic kidneys showed significant tubulointerstitial damage and inflammation, consistent with CTIN, while glomeruli remained preserved.
- Tubular epithelium exhibited altered antigenicity, including vimentin/keratin neoexpression and loss of specific surface glycoproteins.
- Tubulitis was observed in 42.2% of tubular cross-sections, with inflammatory infiltrates primarily composed of B lymphocytes, T helper cells, and macrophages.
Conclusions:
- Ischemia alone can induce changes meeting criteria for CTIN in rats.
- Ischemia-induced alterations in tubular epithelium may initiate cell-mediated immune responses, causing inflammation.
- Ischemia might represent a common pathway for CTIN from various causes.