Absence of alphavbeta6 integrin is linked to initiation and progression of periodontal disease |
| |
Authors: | Ghannad Farzin Nica Daniela Fulle Maria I Garcia Grenier Daniel Putnins Edward E Johnston Sarah Eslami Ameneh Koivisto Leeni Jiang Guoqiao McKee Marc D Häkkinen Lari Larjava Hannu |
| |
Affiliation: | University of British Columbia, Faculty of Dentistry, Laboratory of Periodontal Biology, 2199 Wesbrook Mall, Vancouver, BC, Canada V6T 1Z3. |
| |
Abstract: | Integrin alphavbeta6 is generally not expressed in adult epithelia but is induced in wound healing, cancer, and certain fibrotic disorders. Despite this generalized absence, we observed that alphavbeta6 integrin is constitutively expressed in the healthy junctional epithelium linking the gingiva to tooth enamel. Moreover, expression of alphavbeta6 integrin was down-regulated in human periodontal disease, a common medical condition causing tooth loss and also contributing to the development of cardiovascular diseases by increasing the total systemic inflammatory burden. Remarkably, integrin beta6 knockout mice developed classic signs of spontaneous, chronic periodontal disease with characteristic inflammation, epithelial down-growth, pocket formation, and bone loss around the teeth. Integrin alphavbeta6 acts as a major activator of transforming growth factor-beta1 (TGF-beta1), a key anti-inflammatory regulator in the immune system. Co-expression of TGF-beta1 and alphavbeta6 integrin was observed in the healthy junctional epithelium. Moreover, an antibody that blocks alphavbeta6 integrin-mediated activation of TGF-beta1 initiated inflammatory periodontal disease in a rat model of gingival inflammation. Thus, alphavbeta6 integrin is constitutively expressed in the epithelium sealing the gingiva to the tooth and plays a central role in protection against inflammatory periodontal disease through activation of TGF-beta1. |
| |
Keywords: | |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|