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Spontaneous and clastogen induced chromosomal breakage in scleroderma
D J Wolff1, B W Needleman, S S Wasserman
1Department of Obstetrics and Gynecology, University of Maryland School of Medicine, Baltimore.
The Journal of Rheumatology
|June 1, 1991
Summary
Patients with scleroderma exhibit increased spontaneous and induced chromosomal damage in lymphocytes. This suggests a heightened susceptibility to DNA damage from free radicals in scleroderma patients.
Area of Science:
- Immunology
- Genetics
- Toxicology
Background:
- Scleroderma is an autoimmune disease characterized by fibrosis and vascular abnormalities.
- The underlying mechanisms of scleroderma pathogenesis are not fully understood.
- Genetic and environmental factors are implicated in scleroderma development.
Purpose of the Study:
- To investigate chromosomal damage in lymphocytes of patients with scleroderma.
- To compare DNA damage levels between scleroderma patients and healthy controls.
- To assess the susceptibility of scleroderma lymphocytes to various DNA-damaging agents.
Main Methods:
- Peripheral blood lymphocytes were collected from 10 scleroderma patients and 21 controls.
- Spontaneous chromosomal damage was assessed.
- Chromosomal breakage was induced and evaluated using clastogens: bleomycin, streptonigrin, and 4-nitroquinoline-1-oxide.
Main Results:
- Scleroderma patients showed significantly higher rates of spontaneous chromosomal damage (p = 0.002).
- Patients exhibited elevated chromosomal breakage induced by bleomycin (p = 0.041), streptonigrin (p = 0.035), and 4-nitroquinoline-1-oxide (p = 0.032).
- These findings indicate a generalized susceptibility to DNA damage in scleroderma lymphocytes.
Conclusions:
- Scleroderma lymphocytes display increased vulnerability to DNA damage.
- Free radicals may play a significant role in the observed DNA damage in scleroderma.
- Further research is warranted to explore the implications of DNA damage in scleroderma pathogenesis.