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Effects of TGF-beta on podocyte growth and disease progression in proliferative podocytopathies
Hyun Soon Lee1, Chi Young Song
1Department of Pathology, Seoul National University College of Medicine, Seoul, Korea. hyunsoon@plaza.snu.ac.kr
Abstract:
Injured podocytes proliferate in cellular focal segmental glomerulosclerosis (FSGS), collapsing FSGS and crescentic glomerulonephritis, where TGF-beta(1) is overexpressed in hyperplastic podocytes. Yet effects of podocyte TGF-beta on podocyte growth and development of glomerulosclerosis have not been clearly defined. TGF-beta activates Smads, Ras/extracellular signal-regulated kinase (ERK) and phosphatidyl inositol-3-kinase (PI3K) pathways in podocytes, of which the major TGF-beta/Smad signaling pathway appears to override the minor TGF-beta-induced Ras/ERK/PI3K pathways. We provide evidence that increasedTGF-beta/Smad signaling activity by hyperplastic podocytes may lead to mesangial cell matrix overproduction and eventually to podocyte apoptosis and/or detachment, culminating in the development of glomerulosclerosis. In this regard, TGF-beta, which is overexpressed by hyperplastic podocytes, may play an important role for the cellular and collapsing variants of FSGS to evolve into the classic FSGS pattern. In contrast, podocyte proliferation that is induced by Ras/ERK signaling activity in proliferative podocyte diseases seems to be mostly independent of TGF-beta(1) activity. Collectively, these data bring new insights into our understanding of the overexpression of TGF-beta in hyperplastic podocytes in progressive glomerular diseases.
Insights
Transforming growth factor-beta (TGF-β) signaling in injured podocytes drives glomerulosclerosis development. Overexpressed TGF-β in podocytes promotes disease progression, impacting mesangial cells and leading to podocyte loss.
Area of Science:
- Nephrology
- Cell Biology
- Molecular Biology
Background:
- Podocyte injury and proliferation are hallmarks of various glomerulosclerosis conditions.
- Transforming growth factor-beta 1 (TGF-β1) is overexpressed in hyperplastic podocytes in these diseases.
- The precise role of podocyte-derived TGF-β in glomerulosclerosis pathogenesis remains unclear.
Purpose of the Study:
- To investigate the effects of podocyte-specific TGF-β signaling on podocyte growth.
- To elucidate the role of TGF-β in the development and progression of glomerulosclerosis.
- To understand the interplay between TGF-β and other signaling pathways in podocytes.
Main Methods:
- Analysis of TGF-β signaling pathways (Smads, Ras/ERK, PI3K) in podocytes.
- Investigating the impact of TGF-β on mesangial cell matrix production.
- Assessing podocyte apoptosis and detachment in the context of glomerulosclerosis.
Main Results:
- TGF-β activates Smad, Ras/ERK, and PI3K pathways in podocytes, with Smad signaling being dominant.
- Increased TGF-β/Smad activity in hyperplastic podocytes promotes mesangial matrix overproduction.
- This signaling contributes to podocyte apoptosis/detachment, driving glomerulosclerosis progression.
- Ras/ERK-induced podocyte proliferation appears independent of TGF-β1.
Conclusions:
- Overexpressed TGF-β in hyperplastic podocytes is a key driver of glomerulosclerosis, particularly in FSGS variants.
- TGF-β signaling significantly influences podocyte behavior and contributes to disease severity.
- Understanding these pathways offers insights into progressive glomerular diseases.
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