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Updated: Aug 18, 2026
A Methodological Approach to Non-invasive Assessments of Vascular Function and Morphology
Published on: February 7, 2015
[A study of vascular factor in the pathogenesis of polymyositis]
Min Wang1, Jian-ping Jia, Yu-wei Da
1Department of Neurology, Xuanwu Hospitol, Capital University of Medical Sciences, Beijing 100053, China.
Insights
Polymyositis patients show fewer capillaries and increased expression of ICAM-1 and IL-1alpha in remaining capillaries, suggesting capillary changes contribute to polymyositis pathogenesis.
Area of Science:
- Immunology
- Pathology
- Vascular Biology
Context:
- Polymyositis is an idiopathic inflammatory myopathy.
- Capillary alterations are implicated in various myopathies.
- The specific role of capillaries in polymyositis pathogenesis requires further elucidation.
Purpose:
- To investigate the expression of Intercellular Adhesion Molecule-1 (ICAM-1) and Interleukin-1 alpha (IL-1alpha) in capillaries.
- To quantify capillary density in polymyositis tissues.
- To explore the potential role of capillaries in the pathogenesis of polymyositis.
Summary:
- A quantitative analysis using an image system measured CD34, ICAM-1, and IL-1alpha in muscle biopsies from 10 polymyositis patients and 6 controls.
- Results revealed a significant reduction in capillary percentage in polymyositis tissues compared to controls (P = 0.009).
- Enhanced expression of ICAM-1 and IL-1alpha was observed in the endothelial cells of capillaries from polymyositis patients.
Impact:
- Findings suggest that capillary changes, including reduced density and altered protein expression, may play a significant role in polymyositis development.
- This study provides insights into the vascular component of polymyositis pathogenesis.
- Highlights potential therapeutic targets related to capillary function in inflammatory myopathies.
Objective:
To study ICAM-1, IL-1alpha expression in capillaries and to explore whether capillaries play a role in the pathogenesis of polymyositis.
Methods:
Ten cases of patients with polymyositis and 6 patients with other myopathies were collected. CD34, ICAM-1 and IL-1alpha were selected for a quantitative measurement using an image analysis system, and results were presented as the percent of positive staining in the tissue area.
Results:
We found that the percent of capillaries in tissues from polymyositis was significantly less than that from controls (P = 0.009). ICAM-1 and IL-1alpha expression in endothelial cells of capillaries were stronger in polymyositis patients.
Conclusion:
Our findings indicated that changes of capillaries might participate in the pathogenesis of polymyositis.
