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Updated: Mar 29, 2026
Mouse Kidney Transplantation: Models of Allograft Rejection
Published on: October 11, 2014
Morphometry and Immunoexpression of Metalloproteinase 2 and Its Inhibitor in the Fibrotic and Non-Fibrotic Grafted
Dagmara Szypulska-Koziarska1, Ewa Kwiatkowska2, Martyna Opara-Bajerowicz2
1Department of Histology and Embryology, Pomeranian Medical University in Szczecin, Powstańców Wielkopolskich Al. 72, 70-111 Szczecin, Poland.
Abstract:
Background: Metalloproteinases (MMPs), together with their tissue inhibitors (TIMPs), regulate the extracellular matrix (ECM) in various tissues. MMP-2 and TIMP-2 maintain this process in renal tissue. An imbalance in the MMP-2/TIMP-2 ratio alters the abundance and proportions of specific extracellular matrix components, leading to kidney fibrosis. We aimed to assess differences in the morphometric parameters of the kidney and the immunohistochemical (IHC) expression of MMP-2 and TIMP-2 in kidney biopsies according to their fibrotic state. Methods: The histological slides were scanned using the 3DHISTECH Pannoramic MIDI II Scanner, and the resulting digital images of the sections were analyzed using Pattern Quant software; the morphometric analyses were performed with the Slide Viewer application. Results: In the current manuscript, we have investigated the significant enlargement of the diameter of the urinary space and renal corpuscle, as well as the reduced height of the epithelial lining of the proximal and distal convoluted tubules, of grafted kidneys with fibrosis when compared to the non-fibrotic kidneys. Moreover, we have noticed a rising MMP-2/TIMP-2 ratio in the immunohistochemical reaction in the renal tissue of fibrotic grafted kidneys in comparison to healthy kidneys. Conclusions: These results suggest that the MMP-2/TIMP-2 ratio, together with the lower inhibition of MMP-2, may promote an increased extracellular matrix remodeling, which accompanies the development of fibrosis.
Insights
The MMP-2/TIMP-2 ratio is altered in fibrotic kidneys, with higher ratios linked to kidney fibrosis development. This imbalance in matrix metalloproteinase-2 (MMP-2) and tissue inhibitor of metalloproteinase-2 (TIMP-2) may drive extracellular matrix remodeling in fibrotic conditions.
Area of Science:
- Nephrology
- Pathology
- Biochemistry
Background:
- Matrix metalloproteinases (MMPs) and tissue inhibitors (TIMPs) regulate extracellular matrix (ECM) homeostasis.
- MMP-2 and TIMP-2 are key regulators in renal tissue ECM.
- Imbalance in the MMP-2/TIMP-2 ratio contributes to kidney fibrosis by altering ECM composition.
Purpose of the Study:
- To investigate morphometric differences in kidney biopsies based on fibrotic state.
- To evaluate immunohistochemical (IHC) expression of MMP-2 and TIMP-2 in relation to kidney fibrosis.
Main Methods:
- Digital scanning of histological slides using 3DHISTECH Pannoramic MIDI II Scanner.
- Analysis of digital images with Pattern Quant software and Slide Viewer application.
- Morphometric analysis and IHC assessment of MMP-2 and TIMP-2 expression in kidney biopsies.
Main Results:
- Fibrotic grafted kidneys showed enlarged urinary space and renal corpuscle diameters compared to non-fibrotic kidneys.
- Reduced epithelial lining height in proximal and distal convoluted tubules was observed in fibrotic kidneys.
- An increased MMP-2/TIMP-2 ratio was detected via IHC in fibrotic grafted renal tissue.
Conclusions:
- The elevated MMP-2/TIMP-2 ratio in fibrotic kidneys suggests a role in ECM remodeling.
- Lower inhibition of MMP-2 by TIMP-2 may promote extracellular matrix accumulation.
- These findings highlight the MMP-2/TIMP-2 ratio as a potential factor in kidney fibrosis progression.
