Hematogenous apoptotic mechanism in salivary glands in chronic periodontitis

T. Shikayama, J. Fujita-Yoshigaki, M. Sago-Ito, M. Nakamura-Kiyama, M. Naniwa, S. Hitomi, I. Ujihara, S. Kataoka, N. Yada, W. Ariyoshi, M. Usui, K. Nakashima, K. Ono

研究成果: ジャーナルへの寄稿記事査読

3 被引用数 (Scopus)

抄録

Objective: The aim of the study is to investigate the apoptotic mechanism in salivary glands in the rat experimental periodontitis model. Design: A rat periodontitis model was prepared by using a ligature around the second upper molar. In the salivary (parotid and submandibular) glands and blood samples, putative apoptotic factors and pathway molecules were investigated in vivo and in vitro. Results: Four weeks of ligation (chronic periodontitis) demonstrated significant apoptotic atrophy of the salivary gland, but one week of ligation (initial periodontitis) did not. In the blood plasma, tumor necrosis factor-α (TNF-α) was increased in the periodontitis model, but interleukin-1β and -6 were not. TNF-α receptor type 1, which has an intracellular apoptotic pathway, was expressed in the salivary glands of rats. Western blot analysis of cultured rat primary salivary gland cells demonstrated that TNF-α induced cleavage of poly (ADP-ribose) polymerase (PARP) and caspase-3 in a dose-dependent manner, indicating apoptosis induction. Additionally, we found increment of circulating lymphocytes in the model. Expression of mRNA and immunoreactive cells for the B lymphocyte marker CD19 were increased in the salivary gland in the model. Western blotting showed that coculture with extracted B cells from the periodontitis model increased cleaved PARP in salivary gland cells. Conclusions: Chronic periodontitis status leads to an increase in circulating TNF-α and B lymphocyte infiltration, resulting in apoptotic atrophy of the salivary gland as a periodontitis-induced systemic response.

本文言語英語
論文番号104775
ジャーナルArchives of Oral Biology
117
DOI
出版ステータス出版済み - 9月 2020
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