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Role of transforming growth factor-beta 1 and -beta 2 in ddY mouse nephropathy
1Second Department of Internal Medicine, Hiroshima University School of Medicine, Japan.
Abstract:
We investigated the glomerular distribution of transforming growth factor-beta (TGF-beta 1 and TGF-beta 2) protein and the expression of its mRNA, and related factors, in ddY mice, aged 5-60 weeks, before and after the onset of nephropathy, TGF-beta 1 protein expression was observed from the age of 20 weeks onwards, peaking at 50 weeks, and then declining. Expression of TGF-beta 2 protein gradually increased from 5 to 60 weeks. TGF-beta 1 and TGF-beta 2 mRNA were both detected from 5 to 60 weeks. The mesangial matrix expansion index (MMEI) was significantly higher in mice with nephropathy than in those without nephropathy, as was the expression of TGF-beta 1 and TGF-beta 2 proteins (P < 0.05). TGF-beta 2 was significantly positively correlated with the MMEI (P < 0.05). Infiltration of CD68-positive monocytes/macrophages gradually increased until 60 weeks, and was significantly correlated with the expression of TGF-beta 1 (P < 0.05) and TGF-beta 2 (P < 0.01). These findings indicate that TGF-beta 1 and TGF-beta 2 were overexpressed in ddY mice with overt nephropathy compared with pre-nephropathic mice. TGF-beta 2 may be an important mediator of mesangial matrix expansion in ddY mouse nephropathy.
Insights
Transforming growth factor-beta (TGF-beta) 1 and 2 proteins and mRNA were studied in mice with nephropathy. TGF-beta 2 showed a strong correlation with mesangial matrix expansion, suggesting its role in disease progression.
Area of Science:
- Nephrology
- Molecular Biology
- Immunology
Background:
- Transforming growth factor-beta (TGF-beta) plays a crucial role in kidney function and disease.
- Understanding the specific roles of TGF-beta 1 and TGF-beta 2 in nephropathy is essential for developing targeted therapies.
Purpose of the Study:
- To investigate the glomerular distribution and expression of TGF-beta 1 and TGF-beta 2 proteins and mRNA in ddY mice.
- To correlate TGF-beta expression with mesangial matrix expansion and inflammatory cell infiltration in developing nephropathy.
Main Methods:
- Analysis of TGF-beta 1 and TGF-beta 2 protein and mRNA expression in ddY mice at various ages (5-60 weeks).
- Assessment of mesangial matrix expansion index (MMEI) and CD68-positive monocyte/macrophage infiltration.
- Statistical correlation analysis between TGF-beta levels, MMEI, and inflammatory markers.
Main Results:
- TGF-beta 1 protein expression increased with age, peaking at 50 weeks, while TGF-beta 2 protein expression gradually increased from 5 to 60 weeks.
- Both TGF-beta 1 and TGF-beta 2 mRNA were detected throughout the study period.
- Overexpression of TGF-beta 1 and TGF-beta 2 proteins was observed in mice with nephropathy.
- TGF-beta 2 showed a significant positive correlation with MMEI, and both TGF-beta isoforms correlated with monocyte/macrophage infiltration.
Conclusions:
- TGF-beta 1 and TGF-beta 2 are overexpressed in ddY mice with overt nephropathy.
- TGF-beta 2 may be a key mediator of mesangial matrix expansion in this model of nephropathy.
- These findings highlight the potential therapeutic targets for kidney disease.