Nuttavun Vechvongvan. The effect of inflammation on expression of the receptor for advanced glycation end products (RAGE) and high mobility group box 1 (HMGB1) in human pulp tissue . Master's Degree(General Dentistry). Mahidol University. : Mahidol University, 2008.
The effect of inflammation on expression of the receptor for advanced glycation end products (RAGE) and high mobility group box 1 (HMGB1) in human pulp tissue
Abstract:
The aim of this study was to verify and compare RAGE and HMGB1 in healthy
and inflamed human dental pulp tissues. 30 pulp samples were obtained from teeth
having a clinical diagnosis of irreversible pulpitis (Inflamed pulp, N=15) and of
impacted teeth or non-occluded teeth (Healthy pulp, N=15). Immunohistochemistry
technique was used to detect expression of RAGE. Western blot analysis was used to
detect both RAGE and HMGB1. Measurement of HMGB1 was by ELISA technique.
Immunostaining of specimens from inflamed pulp tissue showed that strong
RAGE was primarily overexpressed and confined to the capillary endothelial cells,
cell periphery of odontoblast, fibroblast, with occasional cytoplasmic staining from all
subjects. In contrast, healthy pulp tissue showed only faint RAGE expression in the
capillary endothelial cells and fibroblast-like cells but not in the odontoblast cell layer.
By western blot analysis, RAGE and HMGB1 is significantly increased in the pulp
inflammatory tissues compared to the healthy tissues. By ELISA technique, the
concentration of HMGB1 in the inflamed group was significantly higher than the
healthy group (p<0.001).
The findings imply that continued expression of RAGE and HMGB1 following
inflammation can act, at least in part, as an important amplification signal for
progressive tooth destruction