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Antigen-presenting dendritic cells in ulcerative colitis.
Yoshio Ikeda1, Sk Md Fazle Akbar, Hidetaka Matsui
1Third Department of Internal Medicine, Ehime University School of Medicine, Shigenobu-cho, Ehime 791-0295, Japan.
Journal of Gastroenterology
|February 8, 2003
Summary
Dendritic cells in ulcerative colitis patients show heightened function, potentially driving inflammation. Lymphocytapheresis reduces this dendritic cell activity, offering a therapeutic approach for immune response regulation.
Area of Science:
- Immunology
- Gastroenterology
Background:
- Dendritic cells are key regulators of immune responses.
- Their phenotype and function in ulcerative colitis (UC) and during lymphocytapheresis are investigated.
Purpose of the Study:
- To analyze dendritic cell characteristics in UC patients.
- To evaluate the impact of lymphocytapheresis on dendritic cell function in UC.
Main Methods:
- Dendritic cells were cultured and their function assessed via mixed leukocyte reactions.
- Phenotypic analysis used flow cytometry; colonic dendritic cells were detected using immunohistochemistry.
- Lymphocytapheresis was performed using continuous flow centrifugation.
Main Results:
- Peripheral blood dendritic cells in UC patients exhibited increased function, maturation, and activation compared to controls.
- Activated, mature (CD83-positive) dendritic cells were present in the colonic mucosa of UC patients.
- Lymphocytapheresis decreased peripheral blood dendritic cell function and reduced inflammatory cytokine levels.
Conclusions:
- Enhanced dendritic cell function in UC may stem from the inflammatory mucosal environment.
- Lymphocytapheresis potentially downregulates the immune response in UC by depleting dendritic cells.