Age-Associated Tooth Loss and Oral Microbial Dysbiosis in a Mouse Genetic Model of Chronic Nicotine Exposure.
| Autor: | Rogers SW; Salt Lake City Veterans Affairs Medical Center: Geriatrics, Research, Education and Clinical Center, Salt Lake City, UT, United States.; Department of Neurobiology, University of Utah School of Medicine, Salt Lake City, UT, United States., Myers EJ; Department of Internal Medicine, Division of Geriatrics, University of Utah School of Medicine, Salt Lake City, UT, United States., Gahring LC; Salt Lake City Veterans Affairs Medical Center: Geriatrics, Research, Education and Clinical Center, Salt Lake City, UT, United States.; Department of Internal Medicine, Division of Geriatrics, University of Utah School of Medicine, Salt Lake City, UT, United States. |
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| Jazyk: | angličtina |
| Zdroj: | Frontiers in immunology [Front Immunol] 2020 Oct 07; Vol. 11, pp. 575200. Date of Electronic Publication: 2020 Oct 07 (Print Publication: 2020). |
| DOI: | 10.3389/fimmu.2020.575200 |
| Abstrakt: | Nicotine acts as a potent modulator of normal cellular responses through the nicotinic acetylcholine receptor subtype alpha7. In a mouse genetic model of alpha7 receptor dysfunction, alpha7 E260A:G , 85 percent of 18 month-old mice exhibit an age-associated spontaneous loosening or complete loss of 3rd molars that was not present in the control mice. The adjacent soft tissues appeared largely unaffected. Further analysis including micro-CT revealed evidence of bone loss surrounding the 3rd molars with areas of cavitation and/or sponge-like (cancellous) bone remodeling in the mandible. The mandible microbiome was examined using 16S-rRNA sequencing. The results show the alpha7 E260A:G oral microbiome included increased landscape complexity indicative of dysbiosis, and a significant increase of some bacteria, particularly Staphylococcus . These results suggest that normal alpha7 function plays a relevant role in maintaining normal gene expression and oral microbiome stasis. Consequently, this mouse model suggests there are consequences to ongoing alpha7 receptor dysfunction and oral health, as can occur from chronic exposure to nicotine as expected from electronic nicotine delivery systems (ENDS or "vaping"), that may not be seen until older age. (Copyright © 2020 Rogers, Myers and Gahring.) |
| Databáze: | MEDLINE |
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