Related Experiment Videos
Mucosal cell-mediated immunological changes associated with experimental graft-versus-host disease
D W Thomas1, J B Matthews, S S Prime
1Department of Oral Dental Science, Bristol Dental Hospital & School, University of Bristol, England.
Summary
This study in a rat model shows graft-versus-host disease (GvHD) causes oral lichenoid reactions. Immune cells infiltrate the tongue lining, suggesting early events in oral lichen planus pathogenesis.
Area of Science:
- Immunology
- Oral Pathology
- Transplantation Immunology
Background:
- Graft-versus-host disease (GvHD) is a serious complication of allogeneic transplantation.
- Understanding oral GvHD is crucial for managing transplant patients.
- Oral lymphocyte-epithelial cell interactions are key in GvHD pathogenesis.
Purpose of the Study:
- To investigate histological changes and immune responses in the lingual mucosa during experimental GvHD.
- To explore lymphocyte-epithelial cell reactions in an oral GvHD model.
- To compare GvHD-induced oral changes with oral lichen planus.
Main Methods:
- Utilized an allogeneic F1 hybrid rat model with Lewis rat splenocytes and Lew/Da rat hosts.
- Assessed GvHD severity using a GvHD index and histological examination of lingual mucosa.
- Employed immunohistochemistry to identify infiltrating immune cells (NK cells, T cells, activated cells) and epithelial markers (Ia).
Main Results:
- Highest GvHD and oral mucosal changes observed with primed donor splenocytes and irradiated hosts.
- Lingual mucosa showed irregular keratosis, no basal cell liquefaction, and inflammatory infiltrate, consistent with oral lichenoid reactions.
- Immunohistochemistry revealed infiltration by NK cells, activated cells, and T cells, with selective migration of helper/inducer T cells into the epithelium.
- Epithelial Ia expression correlated with inflammatory infiltrates and GvHD index.
Conclusions:
- Experimental GvHD induces histological changes in the lingual mucosa resembling oral lichenoid tissue reactions.
- Local mucosal T cell activation occurs without detectable epithelial cell damage, potentially mimicking early oral lichen planus pathogenesis.
- The GvHD rat model is valuable for studying lymphocyte-epithelial interactions, though induced changes are more akin to lichenoid reactions than lichen planus.