Identification of temporal shifts of oral bacteria in bone regeneration following mandibular bone defect injury and therapeutic surgery in a porcine model.

Autor: Sanjar F; Combat Wound Care Group, US Army Institute of Surgical Research, JBSA Fort Sam Houston, San Antonio, Texas, USA., Silliman DT; Combat Wound Care Group, US Army Institute of Surgical Research, JBSA Fort Sam Houston, San Antonio, Texas, USA., Johnson IJ; Combat Wound Care Group, US Army Institute of Surgical Research, JBSA Fort Sam Houston, San Antonio, Texas, USA., Htut Z; Walter Reed Army Institute of Research, Silver Spring, Maryland, USA., Peacock TJ; Office of Research Compliance, Mississippi State University, Meridian, Mississippi, USA., Thompson SF; Carl R. Darnall Army Medical Center, Fort Hood Dental Activities-AEGD, Fort Hood, Texas, USA., Dion GR; Combat Wound Care Group, US Army Institute of Surgical Research, JBSA Fort Sam Houston, San Antonio, Texas, USA., Nahid MA; Walter Reed National Military Medical Center, Bethesda, Maryland, USA., Decker JF; Carl R. Darnall Army Medical Center, Fort Hood Dental Activities-AEGD, Fort Hood, Texas, USA., Leung KP; Combat Wound Care Group, US Army Institute of Surgical Research, JBSA Fort Sam Houston, San Antonio, Texas, USA.
Jazyk: angličtina
Zdroj: Molecular oral microbiology [Mol Oral Microbiol] 2024 Oct; Vol. 39 (5), pp. 381-392. Date of Electronic Publication: 2024 Mar 21.
DOI: 10.1111/omi.12460
Abstrakt: Background: Considered the second largest and most diverse microbiome after the gut, the human oral ecosystem is complex with diverse and niche-specific microorganisms. Although evidence is growing for the importance of oral microbiome in supporting a healthy immune system and preventing local and systemic infections, the influence of craniomaxillofacial (CMF) trauma and routine reconstructive surgical treatments on community structure and function of oral resident microbes remains unknown. CMF injuries affect a large number of people, needing extensive rehabilitation with lasting morbidity and loss of human productivity. Treatment efficacy can be complicated by the overgrowth of opportunistic commensals or multidrug-resistant pathogens in the oral ecosystem due to weakened host immune function and reduced colonization resistance in a dysbiotic oral microbiome.
Aims: To understand the dynamics of microbiota's community structure during CMF injury and subsequent treatments, we induced supra-alveolar mandibular defect in Hanford miniature swine (n = 3) and compared therapeutic approaches of immediate mandibullar reconstructive (IMR) versus delayed mandibullar reconstructive (DMR) surgeries.
Methods: Using bacterial 16S ribosomal RNA gene marker sequencing, the composition and abundance of the bacterial community of the uninjured maxilla (control) and the injured left mandibula (lingual and buccal) treated by DMR were surveyed up to 70-day post-wounding. For the injured right mandibula receiving IMR treatment, the microbial composition and abundance were surveyed up to 14-day post-wounding. Moreover, we measured sera level of biochemical markers (e.g., osteocalcin) associated with bone regeneration and healing. Computed tomography was used to measure and compare mandibular bone characteristics such as trabecular thickness between sites receiving DMR and IMR therapeutic approaches until day 140, the end of study period.
Results: Independent of IMR versus DMR therapy, we observed similar dysbiosis and shifts of the mucosal bacteria residents after CMF injury and/or following treatment. There was an enrichment of Fusobacterium, Porphyromonadaceae, and Bacteroidales accompanied by a decline in Pasteurellaceae, Moraxella, and Neisseria relative abundance in days allotted for healing. We also observed a decline in species richness and abundance driven by reduction in temporal instability and inter-animal heterogeneity on days 0 and 56, with day 0 corresponding to injury in DMR group and day 56 corresponding to delayed treatment for DMR or injury and immediate treatment for the IMR group. Analysis of bone healing features showed comparable bone-healing profiles for IMR vs. DMR therapeutic approach.
(Published 2024. This article is a U.S. Government work and is in the public domain in the USA. Molecular Oral Microbiology published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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