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Oral carriage of Streptococcus mutans harboring the cnm gene relates to an increased incidence of cerebral microbleeds (本文)

細木, 聡 慶應義塾大学

2021.03.23

概要

BACKGROUND AND PURPOSE: Cerebral microbleeds (CMB) are associated with stroke and cognitive impairment. We previously reported a high prevalence of CMB in people with Streptococcus mutans expressing Cnm, a collagen-binding protein in the oral cavity. S. mutans is a major pathogen responsible for dental caries. Repeated challenge with S. mutans harboring the cnm gene encoding Cnm induced cerebral bleeding in stroke-prone spontaneously hypertensive rats. The purpose of this longitudinal study is to examine the relationship of cnm-positive S. mutans to the development of CMB.

METHODS: We retrospectively investigated patients with stroke receiving oral microbiological examination and head 3T magnetic resonance imaging evaluations twice in the period 2014 to 2019, allowing >180-day interval. Patients with cnm-positive S. mutans were compared with those without. Quasi-Poisson regression models were used to explore associations between cnm-positive S. mutans and the increase in number of CMB between the 2 magnetic resonance imaging scans.

RESULTS: A total of 111 patients were identified; 21 (19%) with cnm-positive S. mutans and 90 (81%) without. Clinical history, including blood pressure and the use of antithrombotic agents, were comparable between the 2 groups. New CMB were more commonly observed in patients with cnm-positive S. mutans (52% versus 23%; P=0.008). The incidence of CMB was significantly higher in the group with cnm-positive S. mutans, especially in deep areas, (incidence rate ratios [95% CI], 5.1 [1.9–13.6] for CMB in any brain region; 15.0 [5.4–42.0] for deep CMB), which persisted after adjusting for age, sex, hypertension, and renal impairment (4.7 [1.8–11.9] for CMB in any brain region; 13.9 [4.3–44.5] for deep CMB).

CONCLUSIONS: This study demonstrates that cnm-positive S. mutans is associated with an increased incidence of CMB. Treatment for cnm-positive S. mutans infection may be a novel microbiota-based therapeutic approach for stroke and cognitive impairment.

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