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Shikayama T, Fujita-Yoshigaki J, Sago-Ito M, Nakamura-Kiyama M, Naniwa M, Hitomi S, Ujihara I, Kataoka S, Yada N, Ariyoshi W, Usui M, Nakashima K, Ono K. Hematogenous apoptotic mechanism in salivary glands in chronic periodontitis. Arch Oral Biol 2020; 117:104775. [PMID: 32512258 DOI: 10.1016/j.archoralbio.2020.104775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 05/06/2020] [Accepted: 05/15/2020] [Indexed: 11/29/2022]
Abstract
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.
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Affiliation(s)
- T Shikayama
- Division of Physiology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka, 803-8580, Japan; Division of Periodontology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - J Fujita-Yoshigaki
- Department of Physiology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-nishi, Matsudo, Chiba 271-8587, Japan.
| | - M Sago-Ito
- Division of Orofacial Functions and Orthodontics, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - M Nakamura-Kiyama
- Division of Physiology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka, 803-8580, Japan; Division of Periodontology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - M Naniwa
- Division of Physiology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka, 803-8580, Japan; Division of Oral Health Sciences, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - S Hitomi
- Division of Physiology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka, 803-8580, Japan.
| | - I Ujihara
- Division of Physiology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka, 803-8580, Japan.
| | - S Kataoka
- Division of Anatomy, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - N Yada
- Division of Oral Pathology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - W Ariyoshi
- Division of Infections and Molecular Biology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - M Usui
- Division of Periodontology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - K Nakashima
- Division of Periodontology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka 803-8580, Japan.
| | - K Ono
- Division of Physiology, Kyushu Dental University, 2-6-1 Manazuru, Kokurakitaku, Kitakyushu, Fukuoka, 803-8580, Japan.
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