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Collagen V α1 Chain Decrease in Papillary Dermis from Early Systemic Sclerosis: A New Proposal in Cutaneous Fibrosis
Jymenez de Morais1, Ana Paula P Velosa1, Priscila C Andrade2
1Division of Rheumatology (LIM 17), Faculdade de Medicina da Universidade de São Paulo, São Paulo 01246-903, Brazil.
International Journal of Molecular Sciences
|October 27, 2022
Summary
Systemic sclerosis (SSc) skin fibrosis involves altered collagen V (Col V) deposition. Early SSc shows decreased α1(V) chain expression at the dermoepidermal junction, impacting skin structure and fibrosis.
Area of Science:
- Dermatology
- Biochemistry
- Molecular Biology
Background:
- Cutaneous fibrosis, a hallmark of systemic sclerosis (SSc), is linked to abnormal collagen V (Col V) deposition.
- Col V plays a crucial role in collagen fibrillogenesis, influencing skin structure and disease progression.
Purpose of the Study:
- To investigate the role of collagen V alpha chains (α1(V) and α2(V)) and their coding genes (COL5A1 and COL5A2) in early SSc skin fibrosis.
- To analyze the morphological, ultrastructural, and molecular characteristics of Col V in the initial stages of SSc.
Main Methods:
- Analysis of skin biopsies from early SSc patients and healthy controls.
- Immunofluorescence and ultrastructural immunogold staining to assess protein expression and localization.
- Immunoblotting to confirm protein expression in cutaneous fibroblasts.
- Gene expression analysis of COL5A1 and COL5A2.
- siRNA-mediated knockdown of COL5A2 in SSc fibroblasts.
Main Results:
- Increased expression of α1(V) and α2(V) chains in the reticular dermis of early SSc patients.
- Significantly decreased expression of the α1(V) chain at the dermoepidermal junction in early SSc patients.
- Overexpression of the α2(V) chain in small vessels and capillaries of the reticular dermis in early SSc.
- Decreased α1(V) chain expression in SSc fibroblasts after COL5A2 siRNA treatment.
Conclusions:
- Early SSc is characterized by a significant decrease in the α1(V) chain at the dermoepidermal junction, suggesting altered papillary dermis histoarchitecture.
- This decrease may involve reduced expression of the α1(V)3 homotrimeric isoform, potentially contributing to SSc-related skin thickening and fibrosis.
- Aberrant Col V expression patterns highlight potential therapeutic targets for SSc treatment.
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