Polymicrobial infection alter inflammatory microRNA in rat salivary glands during periodontal disease. (April 2016)

• Record Type: Journal Article
• Authors: Nayar, Gautam; Gauna, Adrienne; Chukkapalli, Sasanka; Velsko, Irina; Kesavalu, Lakshmyya; Cha, Seunghee
• Is Part Of: Anaerobe. Volume 38(2016)
• Page Start: 70
• Page End: 75
• Publication Date: 2016-04
• Subjects: Periodontal pathogens -- Polymicrobial infection -- MicroRNA -- Submandibular glands -- Experimental periodontitis; Anaerobic infections -- Periodicals; Anaerobic bacteria -- Periodicals; Bacterial diseases -- Periodicals; Computer network resources; Anaerobic protozoa -- Periodicals; 579.3
• DOI: 10.1016/j.anaerobe.2015.10.005
• Languages: English
• ISSNs: 1075-9964

Abstract

Abstract: Periodontal disease initiated by subgingival pathogens is linked with diminished secretion of saliva, and implies pathogenic bacteria dissemination to or affects secondary sites such as the salivary glands. MicroRNAs activated in response to bacteria may modulate immune responses against pathogens. Therefore, Sprague–Dawley rats were infected by oral lavage consisting of polymicrobial inocula, namely Porphyromonas gingivalis, Tannerella forsythia, and Treponema denticola, or sham-infected for 12 weeks (n = 6). We quantified inflammatory miRNA expression levels of miRNA-132, miR-146a, and miR-155 at secondary sites to the primary infection of the gingiva, including submandibular salivary glands, lacrimal glands, and pancreas. The presence of bacteria was detected in situ at secondary sites. Infected rat gingiva showed increased relative expression of miR-155. In contrast, miRNA-155 expression was decreased in submandibular salivary glands, along with positive identification of P. gingivalis in 2/6 and T. denticola in 1/6 rat salivary glands. Furthermore, miRNA-132 and miRNA-146a were significantly decreased in the pancreas of infected rats. This study is the first to show primary periodontal infections can alter miRNA profiles in secondary sites such as the salivary gland and pancreas. Whether these alterations contribute to pathologies of salivary glands in Sjögren's syndrome or of pancreas in diabetes warrants further investigation. Highlights: The relative expression of miRNA-155 was increased in periodontal bacteria-infected rat gingiva. Decreased miRNA-155 expression in submandibular salivary glands Intravascular dissemination of viable Porphyromonas gingivalis and Treponema denticola in rat salivary glands. miRNA-132 and miRNA-146a expression significantly decreased in the infected rat pancreas. Primary periodontal infections can alter miRNA profiles in secondary sites such as the salivary gland and pancreas.