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Tao K, Yuan Y, Xie Q, Dong Z. Relationship between human oral microbiome dysbiosis and neuropsychiatric diseases: An updated overview. Behav Brain Res 2024; 471:115111. [PMID: 38871130 DOI: 10.1016/j.bbr.2024.115111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 05/24/2024] [Accepted: 06/10/2024] [Indexed: 06/15/2024]
Abstract
The role of the gut-brain axis in mental health disorders has been extensively studied. As the oral cavity is the starting point of the digestive tract, the role that the oral microbiota plays in mental health disorders has gained recent attention. Oral microbiota can enter the bloodstream and trigger inflammatory responses or translocate to the brain through the trigeminal nerve or olfactory system. Hence, the concept of the oral microbiota-brain axis has emerged. Several hypotheses have been suggested that the oral microbiota can enter the gastrointestinal tract and affect the gut-brain axis; however, literature describing oral-brain communication remains limited. This review summarizes the characteristics of oral microbiota and its mechanisms associated with mental health disorders. Through a comprehensive examination of the relationship between oral microbiota and various neuropsychiatric diseases, such as anxiety, depression, schizophrenia, autism spectrum disorder, epilepsy, Parkinson's disease, and dementia, this review seeks to identify promising avenues of future research.
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Affiliation(s)
- Kai Tao
- West China School of Medicine, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China
| | - Yanling Yuan
- Department of Pharmacy, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China
| | - Qinglian Xie
- Department of Outpatient, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China; Department of Outpatient, West China Xiamen Hospital, Sichuan University, Fujian 361022, People's Republic of China.
| | - Zaiquan Dong
- Mental Health Center, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China.
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Ma Z, Jiang Z, Dong H, Xu W, Yan S, Chen J, Li A, Wang X. Microbial Communities and Functional Genes in Periodontitis and Healthy Controls. Int Dent J 2024; 74:638-646. [PMID: 38448300 PMCID: PMC11123521 DOI: 10.1016/j.identj.2024.01.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 01/05/2024] [Accepted: 01/17/2024] [Indexed: 03/08/2024] Open
Abstract
BACKGROUND Periodontitis is a chronic progressive disease and the leading cause of tooth loss in adults. Recent studies have shown the impact of oral microbial communities on systemic health and diseases such as cancer, atherosclerosis, rheumatoid arthritis, inflammatory bowel disease, diabetes, hypertension, and Alzheimer's disease. In previous case control studies investigatin the relationship between periodontal disease and the oral microbiota, little attention has been paid to the intersections of these domains. METHODS Here, we used high-throughput 16S rRNA sequencing to analyse the differences in the microbial composition in saliva between a group of patients with chronic periodontitis (C; n = 51) and a healthy control group (H; n = 61) and predicted the functional gene composition by Phylogenetic Investigation of Communities by Reconstruction of Unobserved States. RESULTS We found significant alterations in oral microbial diversity between C and H (P = 0.002). Sixteen genera were significantly different between C and H, and 15 of them were enriched in C linear discriminant analysis (LDA > 2). Fifty functional genes were significantly different between C and H, and 34 of them were enriched in C (P < .025). CONCLUSIONS Periodontitis is associated with significant changes in the oral microbial community.
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Affiliation(s)
- Zhonghui Ma
- Department of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China; Gene Hospital of Henan Province, Precision Medicine Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Ze Jiang
- Department of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Haoxin Dong
- Department of Stomatology, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, China
| | - Wenhua Xu
- Department of Stomatology, Zhengzhou People's Hospital, Zhengzhou, China
| | - Su Yan
- Health Management Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jingfeng Chen
- Health Management Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Ang Li
- Gene Hospital of Henan Province, Precision Medicine Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
| | - Xi Wang
- Department of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
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3
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Dai X, Liang R, Dai M, Li X, Zhao W. Smoking Impacts Alzheimer's Disease Progression Through Oral Microbiota Modulation. Mol Neurobiol 2024:10.1007/s12035-024-04241-1. [PMID: 38795302 DOI: 10.1007/s12035-024-04241-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 05/13/2024] [Indexed: 05/27/2024]
Abstract
Alzheimer's disease (AD) is an important public health challenge with a limited understanding of its pathogenesis. Smoking is a significant modifiable risk factor for AD progression, and its specific mechanism is often interpreted from a toxicological perspective. However, microbial infections also contribute to AD, with oral microbiota playing a crucial role in its progression. Notably, smoking alters the ecological structure and pathogenicity of the oral microbiota. Currently, there is no systematic review or summary of the relationship between these three factors; thus, understanding this association can help in the development of new treatments. This review summarizes the connections between smoking, AD, and oral microbiota from existing research. It also explores how smoking affects the occurrence and development of AD through oral microbiota, and examines treatments for oral microbiota that delay the progression of AD. Furthermore, this review emphasizes the potential of the oral microbiota to act as a biomarker for AD. Finally, it considers the feasibility of probiotics and oral antibacterial therapy to expand treatment methods for AD.
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Affiliation(s)
- Xingzhu Dai
- Department of Stomatology, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Rui Liang
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Manqiong Dai
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Xiaoyu Li
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Wanghong Zhao
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China.
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Lin TY, Wang PY, Lin CY, Hung SC. Association of the oral microbiome with cognitive function among older adults: NHANES 2011-2012. J Nutr Health Aging 2024; 28:100264. [PMID: 38772098 DOI: 10.1016/j.jnha.2024.100264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 05/02/2024] [Accepted: 05/12/2024] [Indexed: 05/23/2024]
Abstract
BACKGROUND An association between the gut microbiome and cognitive function has been demonstrated in prior studies. However, whether the oral microbiome, the second largest microbial habitant in humans, has a role in cognition remains unclear. DESIGN, SETTING, PARTICIPANTS Using weighted data from the 2011 to 2012 National Health and Nutrition Examination Survey, we examined the association between oral microbial composition and cognitive function in older adults. The oral microbiome was characterized by 16S ribosomal RNA gene sequencing. Cognitive status was assessed using the Consortium to Establish a Registry for Alzheimer's Disease immediate recall and delayed recall, Animal Fluency Test, and Digit Symbol Substitution Test (DSST). Subjective memory changes over 12 months were also assessed. Linear and logistic regression models were conducted to quantify the association of α-diversity with different cognitive measurements controlling for potential confounding variables. Differences in β-diversity were analyzed using permutational analysis of variance. RESULTS A total of 605 participants aged 60-69 years were included in the analysis. Oral microbial α-diversity was significantly and positively correlated with DSST (β, 2.92; 95% CI, 1.01-4.84). Participants with higher oral microbial α-diversity were more likely to have better cognitive performance status based on DSST (adjusted odds ratio, 2.35; 95% CI, 1.28-4.30) and were less likely to experience subjective memory changes (adjusted odds ratio, 0.43; 95% CI, 0.25-0.74). In addition, β-diversity was statistically significant for the cognitive performance status based on DSST (P = 0.031) and subjective memory changes (P = 0.023). CONCLUSIONS Oral microbial composition was associated with executive function and subjective memory changes among older adults among older U.S. adults in a nationally representative population sample. Oral dysbiosis is a potential biomarker or therapeutic target for cognitive decline. Further work is needed to elucidate the mechanisms underpinning the association between the oral microbiome and cognitive function.
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Affiliation(s)
- Ting-Yun Lin
- Division of Nephrology, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City, Taiwan; School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Pei-Yu Wang
- Graduate Institute of Brain and Mind Sciences, College of Medicine, National Taiwan University, Taipei, Taiwan; Neurobiology and Cognitive Science Center, National Taiwan University, Taipei, Taiwan; PhD Program in Translational Medicine, National Taiwan University and Academia Sinica, Taipei, Taiwan; Taiwan International Graduate Program in Interdisciplinary Neuroscience, National Taiwan University and Academia Sinica, Taipei, Taiwan; PhD Program in Medical Neuroscience, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| | - Chien-Yu Lin
- Department of Internal Medicine, En Chu Kong Hospital, New Taipei City, Taiwan; Department of Environmental Engineering and Health, Yuanpei University of Medical Technology, Hsinchu, Taiwan; and School of Medicine, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan.
| | - Szu-Chun Hung
- Division of Nephrology, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City, Taiwan; School of Medicine, Tzu Chi University, Hualien, Taiwan.
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Chen L, Li X, Liu J, Hou Z, Wei Y, Chen M, Wang B, Cao H, Qiu R, Zhang Y, Ji X, Zhang P, Xue M, Qiu L, Wang L, Li H. Distinctive subgingival microbial signatures in older adults with different levels of cognitive function. J Clin Periodontol 2024. [PMID: 38769711 DOI: 10.1111/jcpe.13997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 04/19/2024] [Accepted: 04/22/2024] [Indexed: 05/22/2024]
Abstract
AIM To examine association between subgingival microbial signatures and levels of cognitive impairment in older adults. MATERIALS AND METHODS We analysed subgingival plaque samples and 16S ribosomal RNA sequences for microbiota among 165 participants (normal controls [NCs]: 40, subjective cognitive decline [SCD]: 40, mild cognitive impairment [MCI]: 49 and dementia: 36). RESULTS The bacterial richness was lower among individuals with worse cognitive function, and subgingival microbial communities differed significantly among the four groups. Declining cognitive function was associated with decreasing relative abundance of genera Capnocytophaga, Saccharibacteria_genera_incertae_sedis, Lautropia and Granulicatella, and increasing abundance of genus Porphyromonas. Moreover, there were differentially abundant genera among the groups. Random forest model based on subgingival microbiota could distinguish between cognitive impairment and NC (AUC = 0.933, 95% confidence interval 0.873-0.992). Significant correlations were observed between oral microbiota and sex, Montreal Cognitive Assessment (MoCA) score and Mini-Mental State Examination score. Partial correlation analysis showed that Leptotrichia and Burkholderia were closely negatively associated with the MoCA score after adjusting for multiple covariates. Gene function was not significantly different between SCD and NC groups, whereas three homozygous genes were altered in MCI patients and two in dementia patients. CONCLUSIONS This is the first study to demonstrate an association between the composition, function and metabolic pathways of subgingival microbiota and different levels of cognitive function among older individuals. Future cohort studies should assess its diagnostic usefulness for cognitive impairment.
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Affiliation(s)
- Lili Chen
- Fujian Provincial Hospital, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Department of Nursing, Fujian Provincial Hospital, Fuzhou, China
| | - Xiuli Li
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Jinxiu Liu
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Zhaoyi Hou
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Yongbao Wei
- Fujian Provincial Hospital, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
| | - Mingfeng Chen
- Fujian Provincial Hospital, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
| | - Bixia Wang
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Huizhen Cao
- Fujian Provincial Hospital, Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
| | - Rongyan Qiu
- Department of Surgery, Fujian Provincial Governmental Hospital, Fuzhou, China
| | - Yuping Zhang
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Xinli Ji
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Ping Zhang
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Mianxiang Xue
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Linlin Qiu
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Linlin Wang
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Hong Li
- The School of Nursing, Fujian Medical University, Fuzhou, China
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Jiao LL, Dong HL, Liu MM, Wu PL, Cao Y, Zhang Y, Gao FG, Zhu HY. The potential roles of salivary biomarkers in neurodegenerative diseases. Neurobiol Dis 2024; 193:106442. [PMID: 38382884 DOI: 10.1016/j.nbd.2024.106442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 02/01/2024] [Accepted: 02/18/2024] [Indexed: 02/23/2024] Open
Abstract
Current research efforts on neurodegenerative diseases are focused on identifying novel and reliable biomarkers for early diagnosis and insight into disease progression. Salivary analysis is gaining increasing interest as a promising source of biomarkers and matrices for measuring neurodegenerative diseases. Saliva collection offers multiple advantages over the currently detected biofluids as it is easily accessible, non-invasive, and repeatable, allowing early diagnosis and timely treatment of the diseases. Here, we review the existing findings on salivary biomarkers and address the potential value in diagnosing neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease, Huntington's disease and Amyotrophic lateral sclerosis. Based on the available research, β-amyloid, tau protein, α-synuclein, DJ-1, Huntington protein in saliva profiles display reliability and validity as the biomarkers of neurodegenerative diseases.
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Affiliation(s)
- Ling-Ling Jiao
- China Tobacco Jiangsu Industrial Co Ltd, Nanjing 210019, China; School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Hui-Lin Dong
- China Tobacco Jiangsu Industrial Co Ltd, Nanjing 210019, China
| | - Meng-Meng Liu
- China Tobacco Jiangsu Industrial Co Ltd, Nanjing 210019, China
| | - Peng-Lin Wu
- China Tobacco Jiangsu Industrial Co Ltd, Nanjing 210019, China
| | - Yi Cao
- China Tobacco Jiangsu Industrial Co Ltd, Nanjing 210019, China
| | - Yuan Zhang
- China Tobacco Jiangsu Industrial Co Ltd, Nanjing 210019, China
| | - Fu-Gao Gao
- Xuzhou Cigarette Factory, China Tobacco Jiangsu Industrial Co Ltd, Xuzhou 221005, China.
| | - Huai-Yuan Zhu
- China Tobacco Jiangsu Industrial Co Ltd, Nanjing 210019, China; School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
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Sakowski SA, Koubek EJ, Chen KS, Goutman SA, Feldman EL. Role of the Exposome in Neurodegenerative Disease: Recent Insights and Future Directions. Ann Neurol 2024; 95:635-652. [PMID: 38411261 PMCID: PMC11023772 DOI: 10.1002/ana.26897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 02/02/2024] [Accepted: 02/05/2024] [Indexed: 02/28/2024]
Abstract
Neurodegenerative diseases are increasing in prevalence and place a significant burden on society. The causes are multifactorial and complex, and increasing evidence suggests a dynamic interplay between genes and the environment, emphasizing the importance of identifying and understanding the role of lifelong exposures, known as the exposome, on the nervous system. This review provides an overview of recent advances toward defining neurodegenerative disease exposomes, focusing on Parkinson's disease, amyotrophic lateral sclerosis, and Alzheimer's disease. We present the current state of the field based on emerging data, elaborate on key themes and potential mechanisms, and conclude with limitations and future directions. ANN NEUROL 2024;95:635-652.
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Affiliation(s)
- Stacey A. Sakowski
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA
- NeuroNetwork for Emerging Therapies, University of Michigan, Ann Arbor, MI 48109, USA
| | - Emily J. Koubek
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA
- NeuroNetwork for Emerging Therapies, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kevin S. Chen
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA
- NeuroNetwork for Emerging Therapies, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Neurosurgery, University of Michigan, Ann Arbor, MI 48109, USA
| | - Stephen A. Goutman
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA
- NeuroNetwork for Emerging Therapies, University of Michigan, Ann Arbor, MI 48109, USA
| | - Eva L. Feldman
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA
- NeuroNetwork for Emerging Therapies, University of Michigan, Ann Arbor, MI 48109, USA
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González A, Fullaondo A, Odriozola A. Techniques, procedures, and applications in microbiome analysis. ADVANCES IN GENETICS 2024; 111:81-115. [PMID: 38908906 DOI: 10.1016/bs.adgen.2024.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/24/2024]
Abstract
Microbiota is a complex community of microorganisms living in a defined environment. Until the 20th century, knowledge of microbiota was partial, as the techniques available for their characterization were primarily based on bacteriological culture. In the last twenty years, the development of DNA sequencing technologies, multi-omics, and bioinformatics has expanded our understanding of microorganisms. We have moved from mainly considering them isolated disease-causing agents to recognizing the microbiota as an essential component of host biology. These techniques have shown that the microbiome plays essential roles in various host phenotypes, influencing development, physiology, reproduction, and evolution. This chapter provides researchers with a summary of the primary concepts, sample collection, experimental techniques, and bioinformatics analysis commonly used in microbiome research. The main features, applications in microbiome studies, and their advantages and limitations are included in each section.
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Affiliation(s)
- Adriana González
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country (UPV/EHU), Leioa, Spain.
| | - Asier Fullaondo
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country (UPV/EHU), Leioa, Spain
| | - Adrián Odriozola
- Department of Genetics, Physical Anthropology and Animal Physiology, University of the Basque Country (UPV/EHU), Leioa, Spain
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Troci A, Philippen S, Rausch P, Rave J, Weyland G, Niemann K, Jessen K, Schmill LP, Aludin S, Franke A, Berg D, Bang C, Bartsch T. Disease- and stage-specific alterations of the oral and fecal microbiota in Alzheimer's disease. PNAS NEXUS 2024; 3:pgad427. [PMID: 38205031 PMCID: PMC10776369 DOI: 10.1093/pnasnexus/pgad427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 11/30/2023] [Indexed: 01/12/2024]
Abstract
Microbial communities in the intestinal tract are suggested to impact the ethiopathogenesis of Alzheimer's disease (AD). The human microbiome might modulate neuroinflammatory processes and contribute to neurodegeneration in AD. However, the microbial compositions in patients with AD at different stages of the disease are still not fully characterized. We used 16S rRNA analyses to investigate the oral and fecal microbiota in patients with AD and mild cognitive impairment (MCI; n = 84), at-risk individuals (APOE4 carriers; n = 17), and healthy controls (n = 50) and investigated the relationship of microbial communities and disease-specific markers via multivariate- and network-based approaches. We found a slightly decreased diversity in the fecal microbiota of patients with AD (average Chao1 diversity for AD = 212 [SD = 66]; for controls = 215 [SD = 55]) and identified differences in bacterial abundances including Bacteroidetes, Ruminococcus, Sutterella, and Porphyromonadaceae. The diversity in the oral microbiota was increased in patients with AD and at-risk individuals (average Chao1 diversity for AD = 174 [SD = 60], for at-risk group = 195 [SD = 49]). Gram-negative proinflammatory bacteria including Haemophilus, Neisseria, Actinobacillus, and Porphyromonas were dominant oral bacteria in patients with AD and MCI and the abundance correlated with the cerebrospinal fluid biomarker. Taken together, we observed a strong shift in the fecal and the oral communities of patients with AD already prominent in prodromal and, in case of the oral microbiota, in at-risk stages. This indicates stage-dependent alterations in oral and fecal microbiota in AD which may contribute to the pathogenesis via a facilitated intestinal and systemic inflammation leading to neuroinflammation and neurodegeneration.
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Affiliation(s)
- Alba Troci
- Institute of Clinical Molecular Biology, Kiel University, Kiel, Germany
| | - Sarah Philippen
- Department of Neurology, Memory Disorders and Plasticity Group, University Hospital Schleswig-Holstein, Kiel 24105, Germany
| | - Philipp Rausch
- Institute of Clinical Molecular Biology, Kiel University, Kiel, Germany
| | - Julius Rave
- Department of Neurology, Memory Disorders and Plasticity Group, University Hospital Schleswig-Holstein, Kiel 24105, Germany
| | - Gina Weyland
- Department of Neurology, Memory Disorders and Plasticity Group, University Hospital Schleswig-Holstein, Kiel 24105, Germany
| | - Katharina Niemann
- Department of Neurology, Memory Disorders and Plasticity Group, University Hospital Schleswig-Holstein, Kiel 24105, Germany
| | - Katharina Jessen
- Department of Neurology, Memory Disorders and Plasticity Group, University Hospital Schleswig-Holstein, Kiel 24105, Germany
| | - Lars-Patrick Schmill
- Department of Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Kiel 24105, Germany
| | - Schekeb Aludin
- Department of Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Kiel 24105, Germany
| | - Andre Franke
- Institute of Clinical Molecular Biology, Kiel University, Kiel, Germany
| | - Daniela Berg
- Department of Neurology, Memory Disorders and Plasticity Group, University Hospital Schleswig-Holstein, Kiel 24105, Germany
| | - Corinna Bang
- Institute of Clinical Molecular Biology, Kiel University, Kiel, Germany
| | - Thorsten Bartsch
- Department of Neurology, Memory Disorders and Plasticity Group, University Hospital Schleswig-Holstein, Kiel 24105, Germany
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Na HS, Jung NY, Song Y, Kim SY, Kim HJ, Lee JY, Chung J. A distinctive subgingival microbiome in patients with periodontitis and Alzheimer's disease compared with cognitively unimpaired periodontitis patients. J Clin Periodontol 2024; 51:43-53. [PMID: 37853506 DOI: 10.1111/jcpe.13880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/04/2023] [Accepted: 09/06/2023] [Indexed: 10/20/2023]
Abstract
AIM Periodontitis is caused by dysbiosis of oral microbes and is associated with increased cognitive decline in Alzheimer's disease (AD), and recently, a potential functional link was proposed between oral microbes and AD. We compared the oral microbiomes of patients with or without AD to evaluate the association between oral microbes and AD in periodontitis. MATERIALS AND METHODS Periodontitis patients with AD (n = 15) and cognitively unimpaired periodontitis patients (CU) (n = 14) were recruited for this study. Each patient underwent an oral examination and neuropsychological evaluation. Buccal, supragingival and subgingival plaque samples were collected, and microbiomes were analysed by next-generation sequencing. Alpha diversity, beta diversity, linear discriminant analysis effect size, analysis of variance-like differential expression analysis and network analysis were used to compare group oral microbiomes. RESULTS All 29 participants had moderate to severe periodontitis. Group buccal and supragingival samples were indistinguishable, but subgingival samples demonstrated significant alpha and beta diversity differences. Differential analysis showed subgingival samples of the AD group had higher prevalence of Atopobium rimae, Dialister pneumosintes, Olsenella sp. HMT 807, Saccharibacteria (TM7) sp. HMT 348 and several species of Prevotella than the CU group. Furthermore, subgingival microbiome network analysis revealed a distinct, closely connected network in the AD group comprised of various Prevotella spp. and several anaerobic bacteria. CONCLUSIONS A unique microbial composition was discovered in the subgingival region in the AD group. Specifically, potential periodontal pathogens were found to be more prevalent in the subgingival plaque samples of the AD group. These bacteria may possess a potential to worsen periodontitis and other systemic diseases. We recommend that AD patients receive regular, careful dental check-ups to ensure proper oral hygiene management.
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Affiliation(s)
- Hee Sam Na
- Department of Oral Microbiology, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
- Oral Genomics Research Center, Pusan National University, Yangsan, Republic of Korea
| | - Na-Yeon Jung
- Department of Neurology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and Technology, Yangsan, Republic of Korea
| | - Yuri Song
- Department of Oral Microbiology, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
- Oral Genomics Research Center, Pusan National University, Yangsan, Republic of Korea
| | - Si Yeong Kim
- Department of Oral Microbiology, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
- Oral Genomics Research Center, Pusan National University, Yangsan, Republic of Korea
| | - Hyun-Joo Kim
- Department of Periodontology, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
- Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Ju Youn Lee
- Department of Periodontology, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
- Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Jin Chung
- Department of Oral Microbiology, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
- Oral Genomics Research Center, Pusan National University, Yangsan, Republic of Korea
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Templeton GB, Fefer G, Case BC, Roach J, Azcarate-Peril MA, Gruen ME, Callahan BJ, Olby NJ. Longitudinal Analysis of Canine Oral Microbiome Using Whole Genome Sequencing in Aging Companion Dogs. Animals (Basel) 2023; 13:3846. [PMID: 38136883 PMCID: PMC10740535 DOI: 10.3390/ani13243846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 12/10/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023] Open
Abstract
Aged companion dogs have a high prevalence of periodontal disease and canine cognitive dysfunction syndrome (CCDS) and the two disorders are correlated. Similarly, periodontal disease and Alzheimer's Disease are correlated in people. However, little is known about the oral microbiota of aging dogs. The goal of this project was to characterize the longitudinal changes in oral microbiota in aged dogs. Oral swabs were taken from ten senior client-owned dogs on 2-3 occasions spanning 24 months and they underwent whole genome shotgun (WGS) sequencing. Cognitive status was established at each sampling time. A statistically significant increase in alpha diversity for bacterial and fungal species was observed between the first and last study visits. Bacteroidetes and proteobacteria were the most abundant bacterial phyla. Porphyromonas gulae was the most abundant bacterial species (11.6% of total reads). The species Lactobacillus gasseri had a statistically significant increase in relative abundance with age whereas Leptotrichia sp. oral taxon 212 had a statistically significant positive longitudinal association with cognition score. There is an increased fungal and bacterial alpha diversity in aging dogs over time and nearly universal oral dysbiosis. The role of the oral microbiota, particularly Leptotrichia and P. gulae and P. gingivalis, in aging and CCDS warrants further investigation.
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Affiliation(s)
- Ginger B. Templeton
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA (M.E.G.)
| | - Gilad Fefer
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA (M.E.G.)
| | - Beth C. Case
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA (M.E.G.)
| | - Jeff Roach
- Department of Medicine, Division of Gastroenterology and Hepatology, and UNC Microbiome Core, Center for Gastrointestinal Biology and Disease, School of Medicine, University of North Carolina, Chapel Hill, NC 27599, USA; (J.R.)
| | - M. Andrea Azcarate-Peril
- Department of Medicine, Division of Gastroenterology and Hepatology, and UNC Microbiome Core, Center for Gastrointestinal Biology and Disease, School of Medicine, University of North Carolina, Chapel Hill, NC 27599, USA; (J.R.)
| | - Margaret E. Gruen
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA (M.E.G.)
| | - Benjamin J. Callahan
- Department of Population Health and Pathobiology, North Carolina State University, Raleigh, NC 27607, USA;
- Bioinformatics Research Center, North Carolina State University, Raleigh, NC 27695, USA
| | - Natasha J. Olby
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA (M.E.G.)
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12
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Ji X, Li P, Guo Q, Guan L, Gao P, Wu B, Cheng H, Xiao J, Ye L. Salivary microbiome profiles for different clinical phenotypes of pituitary adenomas by single-molecular long-read sequencing. Microbiol Spectr 2023; 11:e0023423. [PMID: 37800955 PMCID: PMC10715156 DOI: 10.1128/spectrum.00234-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Accepted: 08/21/2023] [Indexed: 10/07/2023] Open
Abstract
IMPORTANCE The gut and salivary microbiomes have been widely reported to be significantly associated with a number of neurological disorders. The stability of the microbiome in the oral cavity makes it a potentially ideal sample that can be conveniently obtained for the investigation of microbiome-based pathogenesis in diseases. In the present study, we used a single-molecule long-read sequencing technique to study the distribution of the salivary microbiota in patients with pituitary adenoma (PA) and healthy individuals, as well as among four clinical phenotypes of PA. We found that the diversity of salivary microbes was more abundant in PA patients than in healthy individuals. We also observed some unique genera in different PA phenotypes. The bioinformatics-based functional predictions identified potential links between microbes and different clinical phenotypes of PA. This study improves the existing understanding of the pathogenesis of PA and may provide diagnostic and therapeutic targets for PA.
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Affiliation(s)
- Xuefei Ji
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Pingping Li
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Qinglong Guo
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Liao Guan
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Peng Gao
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Bingshan Wu
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Hongwei Cheng
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Jin Xiao
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Lei Ye
- Department of Neurosurgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
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13
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Desai S. Influence of pathogens on host genome and epigenome in development of head and neck cancer. Cancer Rep (Hoboken) 2023; 6:e1846. [PMID: 37322598 PMCID: PMC10644332 DOI: 10.1002/cnr2.1846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Revised: 05/11/2023] [Accepted: 06/05/2023] [Indexed: 06/17/2023] Open
Abstract
BACKGROUND Head and neck cancer (HNSCC) is a heterogeneous group of cancers, affecting multiple regions such as oral cavity, pharynx, larynx, and nasal region, each showing a distinct molecular profile. HNSCC accounts for more than 6 million cases worldwide, soaring mainly in the developing countries. RECENT FINDINGS The aetiology of HNSCC is complex and multifactorial, involving both genetic and environmental factors. The critical role of microbiome, which includes bacteria, viruses, and fungi, is under spotlight due to the recent reports on their contribution in the development and progression of HNSCC. This review focuses on the effect of opportunistic pathogens on the host genome and epigenome, which contributes to the disease progression. Drawing parallels from the host-pathogen interactions observed in other tumour types arising from the epithelial tissue such as colorectal cancer, the review also calls attention to the potential explorations of the role of pathogens in HNSCC biology and discusses the clinical implications of microbiome research in detection and treatment of HNSCC. CONCLUSION Our understanding of the genomic effects of the microbes on the disease progression and the mechanistic insights of the host-pathogen interaction will pave way to novel treatment and preventive approaches in HNSCC.
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14
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Zhou X, Kumar P, Bhuyan DJ, Jensen SO, Roberts TL, Münch GW. Neuroinflammation in Alzheimer's Disease: A Potential Role of Nose-Picking in Pathogen Entry via the Olfactory System? Biomolecules 2023; 13:1568. [PMID: 38002250 PMCID: PMC10669446 DOI: 10.3390/biom13111568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 10/22/2023] [Accepted: 10/23/2023] [Indexed: 11/26/2023] Open
Abstract
Alzheimer's disease (AD) is a complex neurodegenerative disorder characterized by progressive cognitive decline and memory impairment. Many possible factors might contribute to the development of AD, including amyloid peptide and tau deposition, but more recent evidence suggests that neuroinflammation may also play an-at least partial-role in its pathogenesis. In recent years, emerging research has explored the possible involvement of external, invading pathogens in starting or accelerating the neuroinflammatory processes in AD. In this narrative review, we advance the hypothesis that neuroinflammation in AD might be partially caused by viral, bacterial, and fungal pathogens entering the brain through the nose and the olfactory system. The olfactory system represents a plausible route for pathogen entry, given its direct anatomical connection to the brain and its involvement in the early stages of AD. We discuss the potential mechanisms through which pathogens may exploit the olfactory pathway to initiate neuroinflammation, one of them being accidental exposure of the olfactory mucosa to hands contaminated with soil and feces when picking one's nose.
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Affiliation(s)
- Xian Zhou
- NICM Health Research Institute, Western Sydney University, Westmead, NSW 2145, Australia; (X.Z.); (D.J.B.)
| | - Paayal Kumar
- Pharmacology Unit, School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia;
| | - Deep J. Bhuyan
- NICM Health Research Institute, Western Sydney University, Westmead, NSW 2145, Australia; (X.Z.); (D.J.B.)
| | - Slade O. Jensen
- Ingham Institute for Applied Medical Research, Liverpool, NSW 2170, Australia; (S.O.J.); (T.L.R.)
- Microbiology and Infectious Diseases Unit, School of Medicine, Western Sydney University, Liverpool, NSW 2170, Australia
| | - Tara L. Roberts
- Ingham Institute for Applied Medical Research, Liverpool, NSW 2170, Australia; (S.O.J.); (T.L.R.)
- Oncology Unit, School of Medicine, Western Sydney University, Liverpool, NSW 2170, Australia
| | - Gerald W. Münch
- NICM Health Research Institute, Western Sydney University, Westmead, NSW 2145, Australia; (X.Z.); (D.J.B.)
- Pharmacology Unit, School of Medicine, Western Sydney University, Campbelltown, NSW 2560, Australia;
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15
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Bang E, Oh S, Ju U, Chang HE, Hong JS, Baek HJ, Kim KS, Lee HJ, Park KU. Factors influencing oral microbiome analysis: from saliva sampling methods to next-generation sequencing platforms. Sci Rep 2023; 13:10086. [PMID: 37344534 DOI: 10.1038/s41598-023-37246-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 06/19/2023] [Indexed: 06/23/2023] Open
Abstract
The exploration of oral microbiome has been increasing due to its relatedness with various systemic diseases, but standardization of saliva sampling for microbiome analysis has not been established, contributing to the lack of data comparability. Here, we evaluated the factors that influence the microbiome data. Saliva samples were collected by the two collection methods (passive drooling and mouthwash) using three saliva-preservation methods (OMNIgene, DNA/RNA shield, and simple collection). A total of 18 samples were sequenced by both Illumina short-read and Nanopore long-read next-generation sequencing (NGS). The component of the oral microbiome in each sample was compared with alpha and beta diversity and the taxonomic abundances, to find out the effects of factors on oral microbiome data. The alpha diversity indices of the mouthwash sample were significantly higher than that of the drooling group with both short-read and long-read NGS, while no significant differences in microbial diversities were found between the three saliva-preservation methods. Our study shows mouthwash and simple collection are not inferior to other sample collection and saliva-preservation methods, respectively. This result is promising since the convenience and cost-effectiveness of mouthwash and simple collection can simplify the saliva sample preparation, which would greatly help clinical operators and lab workers.
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Affiliation(s)
- Eunsik Bang
- Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Sujin Oh
- Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Uijin Ju
- Seoul National University College of Medicine, Seoul, Republic of Korea
| | | | - Jin-Sil Hong
- Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Hyeong-Jin Baek
- Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Keun-Suh Kim
- Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Hyo-Jung Lee
- Department of Periodontology, Section of Dentistry, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
| | - Kyoung Un Park
- Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
- Department of Laboratory Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
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16
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Weber C, Dilthey A, Finzer P. The role of microbiome-host interactions in the development of Alzheimer´s disease. Front Cell Infect Microbiol 2023; 13:1151021. [PMID: 37333848 PMCID: PMC10272569 DOI: 10.3389/fcimb.2023.1151021] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 05/16/2023] [Indexed: 06/20/2023] Open
Abstract
Alzheimer`s disease (AD) is the most prevalent cause of dementia. It is often assumed that AD is caused by an aggregation of extracellular beta-amyloid and intracellular tau-protein, supported by a recent study showing reduced brain amyloid levels and reduced cognitive decline under treatment with a beta-amyloid-binding antibody. Confirmation of the importance of amyloid as a therapeutic target notwithstanding, the underlying causes of beta-amyloid aggregation in the human brain, however, remain to be elucidated. Multiple lines of evidence point towards an important role of infectious agents and/or inflammatory conditions in the etiology of AD. Various microorganisms have been detected in the cerebrospinal fluid and brains of AD-patients and have thus been hypothesized to be linked to the development of AD, including Porphyromonas gingivalis (PG) and Spirochaetes. Intriguingly, these microorganisms are also found in the oral cavity under normal physiological conditions, which is often affected by multiple pathologies like caries or tooth loss in AD patients. Oral cavity pathologies are mostly accompanied by a compositional shift in the community of oral microbiota, mainly affecting commensal microorganisms and referred to as 'dysbiosis'. Oral dysbiosis seems to be at least partly mediated by key pathogens such as PG, and it is associated with a pro-inflammatory state that promotes the destruction of connective tissue in the mouth, possibly enabling the translocation of pathogenic microbiota from the oral cavity to the nervous system. It has therefore been hypothesized that dysbiosis of the oral microbiome may contribute to the development of AD. In this review, we discuss the infectious hypothesis of AD in the light of the oral microbiome and microbiome-host interactions, which may contribute to or even cause the development of AD. We discuss technical challenges relating to the detection of microorganisms in relevant body fluids and approaches for avoiding false-positives, and introduce the antibacterial protein lactoferrin as a potential link between the dysbiotic microbiome and the host inflammatory reaction.
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17
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Guo H, Li B, Yao H, Liu D, Chen R, Zhou S, Ji Y, Zeng L, Du M. Profiling the oral microbiomes in patients with Alzheimer's disease. Oral Dis 2023; 29:1341-1355. [PMID: 34931394 DOI: 10.1111/odi.14110] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 12/10/2021] [Accepted: 12/16/2021] [Indexed: 01/15/2023]
Abstract
OBJECTIVES To analyse the characteristics of the oral microbiomes and expected to find biomarkers about Alzheimer's disease (AD). SUBJECTS AND METHODS AD patients (n = 26) and cognitive intact people (n = 26) were examined for cognition, depression, oral health and collected saliva and gingival crevicular fluid (GCF) in the morning. Full-length 16S rRNA gene was amplified and sequencing was performed using the PacBio platform. RESULTS The predominant bacterium of salivary microbiome and periodontal microbiome from AD patients was Streptococcus oralis and Porphyromonas gingivalis, respectively. With respect to β diversity analysis, there was a significance difference in periodontal microbiome between AD patients and cognitively intact subjects. The relative abundance of Veillonella parvula significantly increased in oral microbiomes from AD patients. Interestingly, the dominant species were different between early-onset AD and late-onset AD patients. Moreover, the predominant species were changed as the clinical severity of AD. Furthermore, the correlation analysis revealed that V. parvula was associated with AD in both saliva and GCF and that P. gingivalis was associated with AD only in GCF. CONCLUSIONS In this study, the microbiome community of oral microbes was altered in AD patients and periodontal microbiome was sensitive to cognition changes. Moreover, V. parvula and P. gingivalis were associated with AD.
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Affiliation(s)
- Haiying Guo
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
| | - Biao Li
- Wuhan Mental Health Center, Wuhan, Hubei, China
| | - Hantao Yao
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
| | - Danfeng Liu
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
| | - Rourong Chen
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
| | - Shuhui Zhou
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
| | - Yaoting Ji
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
| | - Lin Zeng
- Wuhan Mental Health Center, Wuhan, Hubei, China
| | - Minquan Du
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei, China
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18
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Liu S, Dashper SG, Zhao R. Association Between Oral Bacteria and Alzheimer's Disease: A Systematic Review and Meta-Analysis. J Alzheimers Dis 2023; 91:129-150. [PMID: 36404545 DOI: 10.3233/jad-220627] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Pre-clinical evidence implicates oral bacteria in the pathogenesis of Alzheimer's disease (AD), while clinical studies show diverse results. OBJECTIVE To comprehensively assess the association between oral bacteria and AD with clinical evidence. METHODS Studies investigating the association between oral bacteria and AD were identified through a systematic search of six databases PubMed, Embase, Cochrane Central Library, Scopus, ScienceDirect, and Web of Science. Methodological quality ratings of the included studies were performed. A best evidence synthesis was employed to integrate the results. When applicable, a meta-analysis was conducted using a random-effect model. RESULTS Of the 16 studies included, ten investigated periodontal pathobionts and six were microbiome-wide association studies. Samples from the brain, serum, and oral cavity were tested. We found over a ten-fold and six-fold increased risk of AD when there were oral bacteria (OR = 10.68 95% CI: 4.48-25.43; p < 0.00001, I2 = 0%) and Porphyromonas gingivalis (OR = 6.84 95% CI: 2.70-17.31; p < 0.0001, I2 = 0%) respectively in the brain. While AD patients exhibited lower alpha diversity of oral microbiota than healthy controls, the findings of bacterial communities were inconsistent among studies. The best evidence synthesis suggested a moderate level of evidence for an overall association between oral bacteria and AD and for oral bacteria being a risk factor for AD. CONCLUSION Current evidence moderately supports the association between oral bacteria and AD, while the association was strong when oral bacteria were detectable in the brain. Further evidence is needed to clarify the interrelationship between both individual species and bacterial communities and the development of AD.
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Affiliation(s)
- Sixin Liu
- School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Stuart G Dashper
- Centre for Oral Health Research, Melbourne Dental School, Bio21 Institute, The University of Melbourne, Parkville, Australia
| | - Rui Zhao
- Department of Stomatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
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19
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Wei T, Du Y, Hou T, Zhai C, Li Y, Xiao W, Liu K. Association between adverse oral conditions and cognitive impairment: A literature review. Front Public Health 2023; 11:1147026. [PMID: 37089515 PMCID: PMC10117837 DOI: 10.3389/fpubh.2023.1147026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 03/02/2023] [Indexed: 04/25/2023] Open
Abstract
Oral environment deterioration results from a lack of self-cleaning ability in patients with cognitive dysfunction but is also a risk factor for cognitive dysfunction. Adverse oral conditions can be alleviated and improved through a self-management and medical examination. In this review, the epidemiological evidence of previous studies is integrated to highlight the relationship between periodontitis, tooth loss, oral flora, oral dysfunction and cognitive dysfunction, emphasizing the importance of oral health for cognition. The results show that poor oral condition is associated with cognitive impairment. Although many previous studies have been conducted, there is a lack of higher-level research evidence, different judgment criteria, and conflicting research results. There is a bidirectional relationship between oral health and cognitive dysfunction. A comprehensive analysis of the relationship between oral health and cognitive dysfunction that explores the relationship and takes measures to prevent cognitive dysfunction and control the progression of such diseases is warranted in the future.
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Affiliation(s)
- Tianhao Wei
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Yifeng Du
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Tingting Hou
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Chunjuan Zhai
- Department of Cardiology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Yuqi Li
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
| | - Wei Xiao
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Keke Liu
- Department of Neurology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
- Department of Infection Control, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China
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20
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Li X, Zhao K, Chen J, Ni Z, Yu Z, Hu L, Qin Y, Zhao J, Peng W, Lu L, Gao X, Sun H. Diurnal changes of the oral microbiome in patients with alcohol dependence. Front Cell Infect Microbiol 2022; 12:1068908. [PMID: 36579346 PMCID: PMC9791055 DOI: 10.3389/fcimb.2022.1068908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 11/28/2022] [Indexed: 12/14/2022] Open
Abstract
Background Saliva secretion and oral microbiota change in rhythm with our biological clock. Dysbiosis of the oral microbiome and alcohol consumption have a two-way interactive impact, but little is known about whether the oral microbiome undergoes diurnal changes in composition and function during the daytime in patients with alcohol dependence (AD). Methods The impact of alcohol consumption on the diurnal salivary microbiome was examined in a case-control study of 32 AD patients and 21 healthy control (HC) subjects. We tested the changes in microbial composition and individual taxon abundance by 16S rRNA gene sequencing. Results The present study is the first report showing that alcohol consumption enhanced the richness of the salivary microbiome and lowered the evenness. The composition of the oral microbiota changed significantly in alcohol-dependent patients. Additionally, certain genera were enriched in the AD group, including Actinomyces, Leptotrichia, Sphaerochaeta and Cyanobacteria, all of which have pathogenic effects on the host. There is a correlation between liver enzymes and oral microbiota. KEGG function analysis also showed obvious alterations during the daytime. Conclusion Alcohol drinking influences diurnal changes in the oral microbiota, leading to flora disturbance and related functional impairment. In particular, the diurnal changes of the oral microbiota may open avenues for potential interventions that can relieve the detrimental consequences of AD.
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Affiliation(s)
- Xiangxue Li
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Kangqing Zhao
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Jie Chen
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Zhaojun Ni
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Zhoulong Yu
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Lingming Hu
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Ying Qin
- Addiction Medicine Department, The Second People’s Hospital of Guizhou Province, Guizhou, China
| | - Jingwen Zhao
- Addiction Medicine Department, The Second People’s Hospital of Guizhou Province, Guizhou, China
| | - Wenjuan Peng
- Addiction Medicine Department, The Second People’s Hospital of Guizhou Province, Guizhou, China
| | - Lin Lu
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China
| | - Xuejiao Gao
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China,*Correspondence: Xuejiao Gao, ; Hongqiang Sun,
| | - Hongqiang Sun
- Peking University Sixth Hospital, Peking University Institute of Mental Health, NHC Key Laboratory of Mental Health (Peking University), National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital), Beijing, China,*Correspondence: Xuejiao Gao, ; Hongqiang Sun,
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21
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Jung JH, Kim G, Byun MS, Lee JH, Yi D, Park H, Lee DY. Gut microbiome alterations in preclinical Alzheimer's disease. PLoS One 2022; 17:e0278276. [PMID: 36445883 PMCID: PMC9707757 DOI: 10.1371/journal.pone.0278276] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 11/12/2022] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Although some human studies have reported gut microbiome changes in individuals with Alzheimer's disease (AD) dementia or mild cognitive impairment (MCI), gut microbiome alterations in preclinical AD, i.e., cerebral amyloidosis without cognitive impairment, is largely unknown. OBJECTIVE We aimed to identify gut microbial alterations associated with preclinical AD by comparing cognitively normal (CN) older adults with cerebral Aβ deposition (Aβ+ CN) and those without cerebral Aβ deposition (Aβ- CN). METHODS Seventy-eight CN older participants (18 Aβ+ CN and 60 Aβ- CN) were included, and all participants underwent clinical assessment and Pittsburg compound B-positron emission tomography. The V3-V4 region of the 16S rRNA gene of genomic DNA extracted from feces was amplified and sequenced to establish the microbial community. RESULTS Generalized linear model analysis revealed that the genera Megamonas (B = 3.399, q<0.001), Serratia (B = 3.044, q = 0.005), Leptotrichia (B = 5.862, q = 0.024) and Clostridium (family Clostridiaceae) (B = 0.788, q = 0.034) were more abundant in the Aβ+ CN group than the Aβ- CN group. In contrast, genera CF231 (B = -3.237, q< 0.001), Victivallis (B = -3.447, q = 0.004) Enterococcus (B = -2.044, q = 0.042), Mitsuokella (B = -2.119, q = 0.042) and Clostridium (family Erysipelotrichaceae) (B = -2.222, q = 0.043) were decreased in Aβ+ CN compared to Aβ- CN. Notably, the classification model including the differently abundant genera could effectively distinguish Aβ+ CN from Aβ- CN (AUC = 0.823). CONCLUSION Our findings suggest that specific alterations of gut bacterial taxa are related to preclinical AD, which means these changes may precede cognitive decline. Therefore, examining changes in the microbiome may be helpful in preclinical AD screening.
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Affiliation(s)
- Joon Hyung Jung
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Gihyeon Kim
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea
| | - Min Soo Byun
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jun Ho Lee
- Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Republic of Korea
| | - Dahyun Yi
- Institute of Human Behavioral Medicine, Medical Research Center Seoul National University, Seoul, Republic of Korea
| | - Hansoo Park
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea
- Genome and Company, Seongnam, Republic of Korea
- * E-mail: (DYL); (HP)
| | - Dong Young Lee
- Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Republic of Korea
- Institute of Human Behavioral Medicine, Medical Research Center Seoul National University, Seoul, Republic of Korea
- * E-mail: (DYL); (HP)
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Paudel D, Uehara O, Giri S, Yoshida K, Morikawa T, Kitagawa T, Matsuoka H, Miura H, Toyofuku A, Kuramitsu Y, Ohta T, Kobayashi M, Abiko Y. Effect of psychological stress on the oral-gut microbiota and the potential oral-gut-brain axis. JAPANESE DENTAL SCIENCE REVIEW 2022; 58:365-375. [DOI: 10.1016/j.jdsr.2022.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/21/2022] [Accepted: 11/08/2022] [Indexed: 11/18/2022] Open
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Tarawneh R, Penhos E. The gut microbiome and Alzheimer's disease: Complex and bidirectional interactions. Neurosci Biobehav Rev 2022; 141:104814. [PMID: 35934087 PMCID: PMC9637435 DOI: 10.1016/j.neubiorev.2022.104814] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 07/16/2022] [Accepted: 08/01/2022] [Indexed: 11/20/2022]
Abstract
Structural and functional alterations to the gut microbiome, referred to as gut dysbiosis, have emerged as potential key mediators of neurodegeneration and Alzheimer disease (AD) pathogenesis through the "gut -brain" axis. Emerging data from animal and clinical studies support an important role for gut dysbiosis in mediating neuroinflammation, central and peripheral immune dysregulation, abnormal brain protein aggregation, and impaired intestinal and brain barrier permeability, leading to neuronal loss and cognitive impairment. Gut dysbiosis has also been shown to directly influence various mechanisms involved in neuronal growth and repair, synaptic plasticity, and memory and learning functions. Aging and lifestyle factors including diet, exercise, sleep, and stress influence AD risk through gut dysbiosis. Furthermore, AD is associated with characteristic gut microbial signatures which offer value as potential markers of disease severity and progression. Together, these findings suggest the presence of a complex bidirectional relationship between AD and the gut microbiome and highlight the utility of gut modulation strategies as potential preventative or therapeutic strategies in AD. We here review the current literature regarding the role of the gut-brain axis in AD pathogenesis and its potential role as a future therapeutic target in AD treatment and/or prevention.
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Affiliation(s)
- Rawan Tarawneh
- Department of Neurology, Center for Memory and Aging, Alzheimer Disease Research Center, The University of New Mexico, Albuquerque, NM 87106, USA.
| | - Elena Penhos
- College of Medicine, The Ohio State University, Columbus, OH, USA 43210
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24
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Chen L, Wang B, Liu J, Wu X, Xu X, Cao H, Ji X, Zhang P, Li X, Hou Z, Li H. Different oral and gut microbial profiles in those with Alzheimer's disease consuming anti-inflammatory diets. Front Nutr 2022; 9:974694. [PMID: 36185672 PMCID: PMC9521405 DOI: 10.3389/fnut.2022.974694] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 08/15/2022] [Indexed: 12/06/2022] Open
Abstract
The number of people living with Alzheimer's disease (AD) is increasing alongside with aging of the population. Systemic chronic inflammation and microbial imbalance may play an important role in the pathogenesis of AD. Inflammatory diets regulate both the host microbiomes and inflammatory status. This study aimed to explore the impact of inflammatory diets on oral-gut microbes in patients with AD and the relationship between microbes and markers of systemic inflammation. The dietary inflammatory properties and the oral and gut microorganisms were analyzed using the dietary inflammatory index (DII) and 16S RNA in 60 patients with AD. The α-diversity was not related to the DII (p > 0.05), whereas the β-diversity was different in the oral microbiomes (R2 = 0.061, p = 0.013). In the most anti-inflammatory diet group, Prevotella and Olsenella were more abundant in oral microbiomes and Alistipes, Ruminococcus, Odoribacter, and unclassified Firmicutes were in the gut microbiomes (p < 0.05). Specific oral and gut genera were associated with interleukin-6 (IL)-6, complement 3 (C3), high-sensitivity C-reactive protein (hs-CRP), IL-1β, IL-4, IL-10, IL-12, and tumor necrosis factor-α (TNF-α) (p < 0.05). In conclusion, anti-inflammatory diets seem to be associated with increased abundance of beneficial microbes, and specific oral and gut microbial composition was associated with inflammatory markers.
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Affiliation(s)
- Lili Chen
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- The School of Nursing, Fujian Medical University, Fuzhou, China
- Fujian Provincial Hospital, Fuzhou, China
- Lili Chen
| | - Bixia Wang
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Jinxiu Liu
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Xiaoqi Wu
- Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Xinhua Xu
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Huizhen Cao
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Fujian Provincial Hospital, Fuzhou, China
| | - Xinli Ji
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Ping Zhang
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Xiuli Li
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Zhaoyi Hou
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Hong Li
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- The School of Nursing, Fujian Medical University, Fuzhou, China
- Fujian Provincial Hospital, Fuzhou, China
- *Correspondence: Hong Li
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Chen L, Xu X, Wu X, Cao H, Li X, Hou Z, Wang B, Liu J, Ji X, Zhang P, Li H. A comparison of the composition and functions of the oral and gut microbiotas in Alzheimer’s patients. Front Cell Infect Microbiol 2022; 12:942460. [PMID: 36093178 PMCID: PMC9448892 DOI: 10.3389/fcimb.2022.942460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 08/05/2022] [Indexed: 11/13/2022] Open
Abstract
Objective Alterations in the oral or gut microbiotas have been reported in patients with subjective and mild cognitive impairment or AD dementia. However, whether these microbiotas change with the severity of the AD spectrum (mild, moderate, and severe AD) remains unknown. Thus, we compared alterations in the composition and gene functions of the oral and gut microbiota between different phases of AD. Methods We recruited 172 individuals and classified these into three groups: healthy controls (n = 40), a mild AD group (n = 43) and a moderate AD group (n = 89). Subgingival plaques and fecal samples were collected from all individuals. Then, we conducted 16S ribosomal RNA. sequencing to analyze the microbiotas. Results In order of the severity of cognition impairment (from normal to mild and to moderate AD), the oral abundances of the phyla Firmicutes and Fusobacteria showed a gradual upwards trend, while the abundance of the Proteobacteria phylum gradually decreased. In contrast, the abundance of the Firmicutes and Bacteroidetes phyla in the gut decreased progressively, while that of the Proteobacteria, Verrucomicrobia and Actinobacteria phyla increased gradually. Key differences were identified in the microbiomes when compared between the mild AD and moderate AD groups when applying the linear discriminant analysis effect size (LEfSe) algorithm. LEfSe analysis revealed alterations that were similar to those described above; furthermore, different bacterial taxa were associated with MMSE scores and age. KEGG analysis showed that the functional pathways associated with the oral microbiota were mainly involved in membrane transport and carbohydrate metabolism, while the gene functions of the fecal microbiota related to metabolism of amino acids, energy, cofactors and vitamins; identified significant differences among the three groups. Venn diagram analysis revealed that the number of genera that were present in both the oral and gut microbiota increased progressively from NC to mild AD and then to moderate AD. Conclusions This study is the first to report a comparative analysis of the oral and fecal microbiota of patients with mild and moderate AD. The compositions and functions of the oral and gut microbiotas differed when compared between different stages of AD.
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Affiliation(s)
- Lili Chen
- The School of Nursing, Fujian Medical University, Fuzhou, China
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Nursing Department, Fujian Provincial Hospital, Fuzhou, China
| | - Xinhua Xu
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Xiaoqi Wu
- College of Traditional Chinese Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Huizhen Cao
- The School of Nursing, Fujian Medical University, Fuzhou, China
- Nursing Department, Fujian Provincial Hospital South Branch, Fuzhou, China
| | - Xiuli Li
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Zhaoyi Hou
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Bixia Wang
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Jinxiu Liu
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Xinli Ji
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Ping Zhang
- The School of Nursing, Fujian Medical University, Fuzhou, China
| | - Hong Li
- The School of Nursing, Fujian Medical University, Fuzhou, China
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Nursing Department, Fujian Provincial Hospital, Fuzhou, China
- *Correspondence: Hong Li,
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Jeon JH, Lourenco JM, Fagan MM, Welch CB, Sneed SE, Dubrof S, Duberstein KJ, Callaway TR, West FD, Park HJ. Changes in Oral Microbial Diversity in a Piglet Model of Traumatic Brain Injury. Brain Sci 2022; 12:brainsci12081111. [PMID: 36009173 PMCID: PMC9405691 DOI: 10.3390/brainsci12081111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 08/16/2022] [Accepted: 08/19/2022] [Indexed: 11/16/2022] Open
Abstract
Dynamic changes in the oral microbiome have gained attention due to their potential diagnostic role in neurological diseases such as Alzheimer's disease and Parkinson's disease. Traumatic brain injury (TBI) is a leading cause of death and disability in the United States, but no studies have examined the changes in oral microbiome during the acute stage of TBI using a clinically translational pig model. Crossbred piglets (4-5 weeks old, male) underwent either a controlled cortical impact (TBI, n = 6) or sham surgery (sham, n = 6). The oral microbiome parameters were quantified from the upper and lower gingiva, both buccal mucosa, and floor of the mouth pre-surgery and 1, 3, and 7 days post-surgery (PS) using the 16S rRNA gene. Faith's phylogenetic diversity was significantly lower in the TBI piglets at 7 days PS compared to those of sham, and beta diversity at 1, 3, and 7 days PS was significantly different between TBI and sham piglets. However, no significant changes in the taxonomic composition of the oral microbiome were observed following TBI compared to sham. Further studies are needed to investigate the potential diagnostic role of the oral microbiome during the chronic stage of TBI with a larger number of subjects.
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Affiliation(s)
- Julie Heejin Jeon
- Department of Nutritional Sciences, College of Family and Consumer Sciences, University of Georgia, Athens, GA 30602, USA
| | - Jeferson M. Lourenco
- Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602, USA
| | - Madison M. Fagan
- Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602, USA
- Regenerative Bioscience Center, University of Georgia, Athens, GA 30602, USA
| | - Christina B. Welch
- Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602, USA
| | - Sydney E. Sneed
- Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602, USA
- Regenerative Bioscience Center, University of Georgia, Athens, GA 30602, USA
| | - Stephanie Dubrof
- Department of Nutritional Sciences, College of Family and Consumer Sciences, University of Georgia, Athens, GA 30602, USA
| | - Kylee J. Duberstein
- Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602, USA
- Regenerative Bioscience Center, University of Georgia, Athens, GA 30602, USA
| | - Todd R. Callaway
- Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602, USA
| | - Franklin D. West
- Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602, USA
- Regenerative Bioscience Center, University of Georgia, Athens, GA 30602, USA
| | - Hea Jin Park
- Department of Nutritional Sciences, College of Family and Consumer Sciences, University of Georgia, Athens, GA 30602, USA
- Correspondence:
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Qian XH, Xie RY, Liu XL, Chen SD, Tang HD. Mechanisms of Short-Chain Fatty Acids Derived from Gut Microbiota in Alzheimer's Disease. Aging Dis 2022; 13:1252-1266. [PMID: 35855330 PMCID: PMC9286902 DOI: 10.14336/ad.2021.1215] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Accepted: 12/15/2021] [Indexed: 12/11/2022] Open
Abstract
Short-chain fatty acids (SCFAs) are important metabolites derived from the gut microbiota through fermentation of dietary fiber. SCFAs participate a number of physiological and pathological processes in the human body, such as host metabolism, immune regulation, appetite regulation. Recent studies on gut-brain interaction have shown that SCFAs are important mediators of gut-brain interactions and are involved in the occurrence and development of many neurodegenerative diseases, including Alzheimer's disease. This review summarizes the current research on the potential roles and mechanisms of SCFAs in AD. First, we introduce the metabolic distribution, specific receptors and signaling pathways of SCFAs in human body. The concentration levels of SCFAs in AD patient/animal models are then summarized. In addition, we illustrate the effects and mechanisms of SCFAs on the cognitive level, pathological features (Aβ and tau) and neuroinflammation in AD. Finally, we analyze the translational value of SCFAs as potential therapeutic targets for the treatment of AD.
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Affiliation(s)
- Xiao-hang Qian
- Department of Neurology and Institute of Neurology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
| | - Ru-yan Xie
- Shanghai Guangci Memorial hospital, Shanghai 200025, China.
| | - Xiao-li Liu
- Department of Neurology, Shanghai Fengxian District Central Hospital, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital South Campus, Shanghai 201406, China.
| | - Sheng-di Chen
- Department of Neurology and Institute of Neurology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
- Correspondence should be addressed to: Dr. Sheng-di Chen () and Dr. Hui-dong Tang (), Department of Neurology and Institute of Neurology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Hui-dong Tang
- Department of Neurology and Institute of Neurology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
- Correspondence should be addressed to: Dr. Sheng-di Chen () and Dr. Hui-dong Tang (), Department of Neurology and Institute of Neurology, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
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Mao S, Huang CP, Lan H, Lau HG, Chiang CP, Chen YW. Association of periodontitis and oral microbiomes with Alzheimer’s disease: A narrative systematic review. J Dent Sci 2022; 17:1762-1779. [PMID: 36299333 PMCID: PMC9588805 DOI: 10.1016/j.jds.2022.07.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/02/2022] [Indexed: 11/26/2022] Open
Abstract
Background/purpose Alzheimer’s disease (AD) is a neurodegenerative disorder and the most common form of dementia. The etiology for AD includes age, genetic susceptibility, neuropathology, and infection. Periodontitis is an infectious and inflammatory disease which mainly causes alveolar bone destruction and tooth loss. The evidence of a link between AD and periodontitis remains controversial. Thus far, studies reviewing the association between AD and periodontal disease have been insufficient from the viewpoint of the oral microbiome. The aim of this review was to focus on studies that have explored the relationship between the oral microbiome and AD development by using the next-generation sequencing technique. Materials and methods A comprehensive electronic search of MEDLINE via PubMed, EMBASE, Scopus, and Google Scholar was conducted. The keywords included dementia, Alzheimer’s disease, cognitive impairment, periodontitis, periodontal disease, and oral microbiome. Results This review included 26 articles based on the eligibility criteria. Epidemiologic researches and post-mortem studies showed that the presence of periodontitis is associated with cognitive decline, suggesting a possible role of periodontal pathogens in the pathogenesis of AD. The reported microbiome was inconsistent with those in gene sequencing studies. Nevertheless, Gram-negative species may be possible candidates. Conclusion This review suggests that periodontal infection is associated with AD. The contributing microbiome remains unconfirmed, possibly because of different microbiome sampling sites or methods. Additional large-scale studies with periodontal intervention and longitudinal follow-up are warranted to clarify the relationship between periodontal disease and AD.
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Zhang K, Ma X, Zhang R, Liu Z, Jiang L, Qin Y, Zhang D, Tian P, Gao Z, Zhang N, Shi Z, Xu S. Crosstalk Between Gut Microflora and Vitamin D Receptor SNPs Are Associated with the Risk of Amnestic Mild Cognitive Impairment in a Chinese Elderly Population. J Alzheimers Dis 2022; 88:357-373. [PMID: 35599486 DOI: 10.3233/jad-220101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background: The interactions between environmental factors and genetic variants have been implicated in the pathogenesis of Alzheimer’s disease (AD). The altered gut microbiota (GM) and vitamin D deficiency are closely associated with the higher risk of AD. Objective: This study was performed to evaluate whether the crosstalk between GM and single nucleotide polymorphisms (SNPs) of vitamin D receptor (VDR) or vitamin D binding protein (VDBP) have a link with the risk of amnestic mild cognitive impairment (aMCI) in the Chinese elderly population. Methods: A total of 171 aMCI patients and 261 cognitive normal controls (NC) were enrolled in this study. Six tag SNPs of VDR and VDBP were genotyped by PCR-RFLP. The serum levels of vitamin D, Aβ1-42, and p-tau (181P) were determined by using of ELISA kits. The alterations in the GM were analyzed by full-length 16S ribosomal RNA (rRNA) gene sequencing. Results: The frequencies of AG genotype and A allele of VDR rs1544410 in aMCI group were significantly higher than that in NC group (genotype: p = 0.002, allele: p = 0.003). Patients with aMCI showed an abnormal GM composition compared with NC group. Interestingly, significant differences in GM composition were found between aMCI and NC group among individuals with AG genotype, as well as between individuals with AG and GG genotype of VDR rs1544410 among patients with aMCI. Conclusion: These results implicated that the crosstalk between gut microflora and vitamin D receptor variants are associated with the risk of aMCI in Chinese elderly population.
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Affiliation(s)
- Kaixia Zhang
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
| | - Xiaoying Ma
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
| | - Rui Zhang
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
- Hebei International Joint Research Center forBrain Science, Shijiazhuang, P. R. China
- HebeiKey Laboratory of Brain Science and Psychiatric-Psychologic Disease, Shijiazhuang, P. R. China
| | - Zanchao Liu
- Department ofEndocrinology, The Second Hospital of Shijiazhuang City, Shijiazhuang, P. R. China
| | - Lei Jiang
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
- Hebei International Joint Research Center forBrain Science, Shijiazhuang, P. R. China
- HebeiKey Laboratory of Brain Science and Psychiatric-Psychologic Disease, Shijiazhuang, P. R. China
| | - Yushi Qin
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
| | - Di Zhang
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
| | - Pei Tian
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
| | - ZhaoYu Gao
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
- Hebei International Joint Research Center forBrain Science, Shijiazhuang, P. R. China
- HebeiKey Laboratory of Brain Science and Psychiatric-Psychologic Disease, Shijiazhuang, P. R. China
| | - Nan Zhang
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
- Hebei International Joint Research Center forBrain Science, Shijiazhuang, P. R. China
- HebeiKey Laboratory of Brain Science and Psychiatric-Psychologic Disease, Shijiazhuang, P. R. China
| | - Zhongli Shi
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
- Hebei International Joint Research Center forBrain Science, Shijiazhuang, P. R. China
- HebeiKey Laboratory of Brain Science and Psychiatric-Psychologic Disease, Shijiazhuang, P. R. China
| | - Shunjiang Xu
- Central Laboratory, The First Hospital of HebeiMedical University, Shijiazhuang, P. R. China
- Hebei International Joint Research Center forBrain Science, Shijiazhuang, P. R. China
- HebeiKey Laboratory of Brain Science and Psychiatric-Psychologic Disease, Shijiazhuang, P. R. China
- Research Unit of Digestive Tract Microecosystem Pharmacology and Toxicology, ChineseAcademy of Medical Sciences, Beijing, P. R. China
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Jung W, Jang S. Oral Microbiome Research on Oral Lichen Planus: Current Findings and Perspectives. BIOLOGY 2022; 11:biology11050723. [PMID: 35625451 PMCID: PMC9138428 DOI: 10.3390/biology11050723] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 05/05/2022] [Accepted: 05/07/2022] [Indexed: 12/12/2022]
Abstract
Simple Summary Oral lichen planus is a disease of the oral mucosa, which frequently affects women aged 40 years or older. Though the T cell-mediated immune response is involved in the development of oral lichen planus, attempts to identify a microorganism that causes the disease have been unsuccessful. Recent studies on the development of oral lichen planus are focusing on the role of the oral microbiome, which includes oral microbiota and their products, and the host environment. The role of the human microbiome in various diseases has been identified and regulating the microbiome is becoming important in personalized medicine. In this review, we summarized current findings on the role of the oral microbiome in the development of oral lichen planus. The homeostasis of the oral microbiome is disrupted in patients, and functional analysis of oral microbiota and oral mucosa implies that pathways involved in defense against bacterial infection and in the inflammatory response are activated in the oral lichen planus-associated oral microbiome. Though the lack of studies to date makes it difficult to conclude, further studies on the oral microbiome associated with the disease will enable a holistic understanding of the role of the oral microbiome in the development of oral lichen planus and developing a personalized therapy for the disease. Abstract Oral lichen planus (OLP) is a chronic inflammatory disease of the oral mucosa with an unknown etiology. The role of oral microbes in the development of OLP has gained researchers’ interest. In this review, we summarized the findings of studies focused on the relationship between OLP and oral microbiome, which includes the composition of oral microbiota, molecules produced by oral microbiota or the host, and the oral environment of the host. According to the studies, the oral microbial community in OLP patients undergoes dysbiosis, and the microbial dysbiosis in OLP patients is more prominent in the buccal mucosa than in the saliva. However, no same microorganisms have been suggested to be associated with OLP in multiple investigations, implying that the functional aspects of the oral microbiota are more important in OLP development than the composition of the oral microbiota. According to studies on host factors that make up the oral environment, signal pathways involved in cellular processes, such as keratinization, inflammation, and T cell responses are triggered in OLP. Studies on the functional aspects of the oral microbiota, as well as interactions between the host and the oral microbiota, are still lacking, and more research is required.
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Affiliation(s)
- Won Jung
- Department of Oral Medicine, Institute of Oral Bioscience, School of Dentistry, Jeonbuk National University, Jeonju-si 54907, Korea;
- Research Institute of Clinical Medicine, Jeonbuk National University, Jeonju-si 54907, Korea
- Biomedical Research Institute, Jeonbuk National University Hospital, Jeonju-si 54907, Korea
| | - Sungil Jang
- Department of Oral Biochemistry, Institute of Oral Bioscience, School of Dentistry, Jeonbuk National University, Jeonju-si 54907, Korea
- Correspondence: ; Tel.: +82-63-270-4027
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Li X, Liu Y, Yang X, Li C, Song Z. The Oral Microbiota: Community Composition, Influencing Factors, Pathogenesis, and Interventions. Front Microbiol 2022; 13:895537. [PMID: 35572634 PMCID: PMC9100676 DOI: 10.3389/fmicb.2022.895537] [Citation(s) in RCA: 53] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 04/06/2022] [Indexed: 12/12/2022] Open
Abstract
The human oral cavity provides a habitat for oral microbial communities. The complexity of its anatomical structure, its connectivity to the outside, and its moist environment contribute to the complexity and ecological site specificity of the microbiome colonized therein. Complex endogenous and exogenous factors affect the occurrence and development of the oral microbiota, and maintain it in a dynamic balance. The dysbiotic state, in which the microbial composition is altered and the microecological balance between host and microorganisms is disturbed, can lead to oral and even systemic diseases. In this review, we discuss the current research on the composition of the oral microbiota, the factors influencing it, and its relationships with common oral diseases. We focus on the specificity of the microbiota at different niches in the oral cavity, the communities of the oral microbiome, the mycobiome, and the virome within oral biofilms, and interventions targeting oral pathogens associated with disease. With these data, we aim to extend our understanding of oral microorganisms and provide new ideas for the clinical management of infectious oral diseases.
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Affiliation(s)
- Xinyi Li
- School of Stomatology, Southwest Medical University, Luzhou, China
| | - Yanmei Liu
- School of Stomatology, Southwest Medical University, Luzhou, China
| | - Xingyou Yang
- Molecular Biotechnology Platform, Public Center of Experimental Technology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
| | - Chengwen Li
- Molecular Biotechnology Platform, Public Center of Experimental Technology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
- *Correspondence: Chengwen Li,
| | - Zhangyong Song
- Molecular Biotechnology Platform, Public Center of Experimental Technology, School of Basic Medical Sciences, Southwest Medical University, Luzhou, China
- Zhangyong Song,
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Hou K, Wu ZX, Chen XY, Wang JQ, Zhang D, Xiao C, Zhu D, Koya JB, Wei L, Li J, Chen ZS. Microbiota in health and diseases. Signal Transduct Target Ther 2022; 7:135. [PMID: 35461318 PMCID: PMC9034083 DOI: 10.1038/s41392-022-00974-4] [Citation(s) in RCA: 490] [Impact Index Per Article: 245.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 03/11/2022] [Accepted: 03/15/2022] [Indexed: 02/07/2023] Open
Abstract
The role of microbiota in health and diseases is being highlighted by numerous studies since its discovery. Depending on the localized regions, microbiota can be classified into gut, oral, respiratory, and skin microbiota. The microbial communities are in symbiosis with the host, contributing to homeostasis and regulating immune function. However, microbiota dysbiosis can lead to dysregulation of bodily functions and diseases including cardiovascular diseases (CVDs), cancers, respiratory diseases, etc. In this review, we discuss the current knowledge of how microbiota links to host health or pathogenesis. We first summarize the research of microbiota in healthy conditions, including the gut-brain axis, colonization resistance and immune modulation. Then, we highlight the pathogenesis of microbiota dysbiosis in disease development and progression, primarily associated with dysregulation of community composition, modulation of host immune response, and induction of chronic inflammation. Finally, we introduce the clinical approaches that utilize microbiota for disease treatment, such as microbiota modulation and fecal microbial transplantation.
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Affiliation(s)
- Kaijian Hou
- Department of Endocrine and Metabolic Diseases, Longhu Hospital, The First Affiliated Hospital of Medical College of Shantou University, Shantou, Guangdong, 515000, China
| | - Zhuo-Xun Wu
- Department of Pharmaceutical Sciences, Institute for Biotechnology, College of Pharmacy and Health Sciences, St. John's University, Queens, NY, 11439, USA
| | - Xuan-Yu Chen
- Department of Pharmaceutical Sciences, Institute for Biotechnology, College of Pharmacy and Health Sciences, St. John's University, Queens, NY, 11439, USA
| | - Jing-Quan Wang
- Department of Pharmaceutical Sciences, Institute for Biotechnology, College of Pharmacy and Health Sciences, St. John's University, Queens, NY, 11439, USA
| | - Dongya Zhang
- Microbiome Research Center, Moon (Guangzhou) Biotech Ltd, Guangzhou, 510535, China
| | - Chuanxing Xiao
- Department of Endocrine and Metabolic Diseases, Longhu Hospital, The First Affiliated Hospital of Medical College of Shantou University, Shantou, Guangdong, 515000, China
| | - Dan Zhu
- Department of Endocrine and Metabolic Diseases, Longhu Hospital, The First Affiliated Hospital of Medical College of Shantou University, Shantou, Guangdong, 515000, China
| | - Jagadish B Koya
- Department of Pharmaceutical Sciences, Institute for Biotechnology, College of Pharmacy and Health Sciences, St. John's University, Queens, NY, 11439, USA
| | - Liuya Wei
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, 261053, China
| | - Jilin Li
- Department of Cardiovascular, The Second Affiliated Hospital of Medical College of Shantou University, Shantou, Guangdong, 515000, China
| | - Zhe-Sheng Chen
- Department of Pharmaceutical Sciences, Institute for Biotechnology, College of Pharmacy and Health Sciences, St. John's University, Queens, NY, 11439, USA
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Cirstea MS, Kliger D, MacLellan AD, Yu AC, Langlois J, Fan M, Boroomand S, Kharazyan F, Hsiung RGY, MacVicar BA, Chertkow H, Whitehead V, Finlay B, Appel-Cresswell S. The Oral and Fecal Microbiota in a Canadian Cohort of Alzheimer's Disease. J Alzheimers Dis 2022; 87:247-258. [PMID: 35275538 DOI: 10.3233/jad-215520] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Despite decades of research, our understanding of Alzheimer's disease (AD) etiology remains incomplete. In recent years, appreciation has grown for potential roles for the microbiota in shaping neurological health. OBJECTIVE This study aimed to examine associations between the microbiota and AD in a human cross-sectional cohort. METHODS Forty-five AD patients and 54 matched controls were recruited in Vancouver, Canada. Fecal and oral samples underwent 16S microbiota sequencing. A wide array of demographic and clinical data were collected. Differences between participant groups were assessed, and associations between microbes and clinical variables were examined within the AD population. RESULTS The gut microbiota of AD patients displayed lower diversity relative to controls, although taxonomic differences were sparse. In contrast, the AD oral microbiota displayed higher diversity, with several taxonomic differences relative to controls, including a lower abundance of the families Streptococcaceae and Actinomycetaceae, and a higher abundance of Weeksellaceae, among others. The periodontitis-associated oral microbe Porphyromonas gingivalis was 5 times more prevalent among patients. No significant associations between gut or oral microbes and cognition were detected, but several correlations existed between microbes and mood disorders and BMI among patients, including a strong positive correlation between Alphaproteobacteria and depression score. CONCLUSION The gut microbiota of AD patients was not overtly different from controls, although it displayed lower diversity, an overall marker of microbiota health. The oral microbiota did display marked differences. Cognition was not associated with a microbial signature, but other relevant AD factors including mood and BMI did demonstrate an association.
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Affiliation(s)
- Mihai S Cirstea
- Department of Microbiology & Immunology, University of British Columbia, Vancouver, BC, Canada.,Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,Pacific Parkinson's Research Centre, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Daniel Kliger
- Pacific Parkinson's Research Centre, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada.,Clinic for Alzheimer Disease and Related Disorders, University of British Columbia, Vancouver, BC, Canada
| | - Abbey D MacLellan
- Pacific Parkinson's Research Centre, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Adam C Yu
- Pacific Parkinson's Research Centre, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Jenna Langlois
- Pacific Parkinson's Research Centre, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada.,Clinic for Alzheimer Disease and Related Disorders, University of British Columbia, Vancouver, BC, Canada
| | - Mannie Fan
- Clinic for Alzheimer Disease and Related Disorders, University of British Columbia, Vancouver, BC, Canada
| | - Seti Boroomand
- Borgland Family Brain Tissue and DNA Bank, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Faezeh Kharazyan
- Borgland Family Brain Tissue and DNA Bank, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada
| | - Robyn G Y Hsiung
- Clinic for Alzheimer Disease and Related Disorders, University of British Columbia, Vancouver, BC, Canada.,Division of Neurology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Brian A MacVicar
- Department of Psychiatry, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Howard Chertkow
- Baycrest and Rotman Research Institute, Toronto, Ontario, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Victor Whitehead
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
| | - Brett Finlay
- Department of Microbiology & Immunology, University of British Columbia, Vancouver, BC, Canada.,Michael Smith Laboratories, University of British Columbia, Vancouver, BC, Canada.,Department of Biochemistry, University of British Columbia, Vancouver, BC, Canada
| | - Silke Appel-Cresswell
- Pacific Parkinson's Research Centre, Djavad Mowafaghian Centre for Brain Health, University of British Columbia, Vancouver, BC, Canada.,Division of Neurology, Department of Medicine, University of British Columbia, Vancouver, BC, Canada
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Jungbauer G, Stähli A, Zhu X, Auber Alberi L, Sculean A, Eick S. Periodontal microorganisms and Alzheimer disease - A causative relationship? Periodontol 2000 2022; 89:59-82. [PMID: 35244967 PMCID: PMC9314828 DOI: 10.1111/prd.12429] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 12/07/2021] [Accepted: 12/21/2021] [Indexed: 01/10/2023]
Abstract
In the initiation or exacerbation of Alzheimer disease, the dissemination of oral microorganisms into the brain tissue or the low‐level systemic inflammation have been speculated to play a role. However, the impact of oral microorganisms, such as Porphyromonas gingivalis, on the pathogenesis of Alzheimer disease and the potential causative relationship is still unclear. The present review has critically reviewed the literature by examining the following aspects: (a) the oral microbiome and the immune response in the elderly population, (b) human studies on the association between periodontal and gut microorganisms and Alzheimer disease, (c) animal and in vitro studies on microorganisms and Alzheimer disease, and (d) preventive and therapeutic approaches. Factors contributing to microbial dysbiosis seem to be aging, local inflammation, systemic diseases, wearing of dentures, living in nursing homes and no access to adequate oral hygiene measures. Porphyromonas gingivalis was detectable in post‐mortem brain samples. Microbiome analyses of saliva samples or oral biofilms showed a decreased microbial diversity and a different composition in Alzheimer disease compared to cognitively healthy subjects. Many in‐vitro and animal studies underline the potential of P gingivalis to induce Alzheimer disease‐related alterations. In animal models, recurring applications of P gingivalis or its components increased pro‐inflammatory mediators and β‐amyloid in the brain and deteriorated the animals' cognitive performance. Since periodontitis is the result of a disturbed microbial homoeostasis, an effect of periodontal therapy on the oral microbiome and host response related to cognitive parameters may be suggested and should be elucidated in further clinical trials.
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Affiliation(s)
- Gert Jungbauer
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.,Private Dental Practice, Straubing, Germany
| | - Alexandra Stähli
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Xilei Zhu
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | | | - Anton Sculean
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Sigrun Eick
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
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Yang B, Tao B, Yin Q, Chai Z, Xu L, Zhao Q, Wang J. Associations Between Oral Health Status, Perceived Stress, and Neuropsychiatric Symptoms Among Community Individuals With Alzheimer's Disease: A Mediation Analysis. Front Aging Neurosci 2022; 13:801209. [PMID: 35082659 PMCID: PMC8786079 DOI: 10.3389/fnagi.2021.801209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/14/2021] [Indexed: 11/13/2022] Open
Abstract
Community individuals with Alzheimer's disease (AD) experience oral disease alongside neuropsychiatric symptoms (NPS) with disease progression. Despite growing evidence for the link between oral health and cognitive status, few studies have investigated the associations between oral health and NPS, especially based on individuals' experience of AD. The primary aim of this study was to examine (a) the difference in oral health-related stressors among individuals with AD, mild cognitive impairment (MCI), and subjective cognitive decline (SCD); and (b) the associations of these stressors with NPS under the framework of the stress process model (SPM). A cross-sectional study was conducted among individuals diagnosed with AD (n = 35), MCI (n = 36) or SCD (n = 35), matched for age, sex education, and body mass index (BMI). Multiple regression and mediation model analyses were performed to explore predictors and their relationships with NPS based on the SPM. Data collection comprised four sections: (a) individual context; (b) oral health-related stressors, including dental caries, periodontal status, oral hygiene, the geriatric oral health assessment index (GOHAI), oral salivary microbiota, pro-inflammatory cytokines, and oral health behavior; (c) subjective stressors (i.e., perceived stress [PS]); and (d) NPS. Decayed, missing, and filled teeth (DMFT), missing teeth (MT), loss of attachment (LoA), plaque index (PLI), PS, oral health behavior, GOHAI, pro-inflammatory cytokines, and salivary bacterial composition were significantly different among the three groups; these parameters were poorer in the AD group than SCD and/or MCI group. LoA, PLI, PS, and pain or discomfort in the GOHAI were directly associated with NPS. PLI, LoA, and psychosocial function in the GOHAI indirectly affected NPS, and this relationship was mediated by PS. Individuals with AD reported greater oral health-related stressors. This study identifies direct and indirect associations linking oral health-related stressors and PS with NPS in individuals with AD. Our findings suggest that targeted dental care and oral-related stressor control may be valuable for managing NPS.
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Affiliation(s)
- Bing Yang
- Department of Nursing, Stomatological Hospital of Chongqing Medical University, Chongqing, China
| | - Binbin Tao
- Department of Nursing, Stomatological Hospital of Chongqing Medical University, Chongqing, China
| | - Qianyu Yin
- Department of Nursing, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhaowu Chai
- Department of Nursing, Stomatological Hospital of Chongqing Medical University, Chongqing, China
| | - Ling Xu
- Community Health Center of Daxigou, Chongqing, China
| | - Qinghua Zhao
- Department of Nursing, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jun Wang
- Department of Nursing, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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Maitre Y, Mahalli R, Micheneau P, Delpierre A, Amador G, Denis F. Evidence and Therapeutic Perspectives in the Relationship between the Oral Microbiome and Alzheimer's Disease: A Systematic Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182111157. [PMID: 34769677 PMCID: PMC8583399 DOI: 10.3390/ijerph182111157] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 10/20/2021] [Accepted: 10/21/2021] [Indexed: 02/06/2023]
Abstract
This review aims to clarify the nature of the link between Alzheimer’s disease and the oral microbiome on an epidemiological and pathophysiological level, as well as to highlight new therapeutic perspectives that contribute to the management of this disease. We performed a systematic review, following the Preferred Reporting Items for Systematic Reviews checklist, from January 2000 to July 2021. The terms “plaque,” “saliva,” and “mouth” were associated with the search term “oral diseases” and used in combination with the Boolean operator “AND”/“OR”. We included experimental or clinical studies and excluded conferences, abstracts, reviews, and editorials. A total of 27 articles were selected. Evidence for the impact of the oral microbiome on the pathophysiological and immunoinflammatory mechanisms of Alzheimer’s disease is accumulating. The impact of the oral microbiome on the development of AD opens the door to complementary therapies such as phototherapy and/or the use of prebiotic compounds and probiotic strains for global or targeted modulation of the oral microbiome in order to have a favourable influence on the evolution of this pathology in the future.
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Affiliation(s)
- Yoann Maitre
- Emergency Department, Montpellier University Hospital, 34090 Montpellier, France;
- EA 2415, Aide à la Décision pour une Médecine Personnalisée, Université de Montpellier, 34093 Montpellier, France
| | - Rachid Mahalli
- Department of Odontology, Tours University Hospital, 37000 Tours, France; (R.M.); (P.M.); (A.D.)
| | - Pierre Micheneau
- Department of Odontology, Tours University Hospital, 37000 Tours, France; (R.M.); (P.M.); (A.D.)
| | - Alexis Delpierre
- Department of Odontology, Tours University Hospital, 37000 Tours, France; (R.M.); (P.M.); (A.D.)
| | - Gilles Amador
- Faculty of Dentistry, Nantes University, 44000 Nantes, France;
| | - Frédéric Denis
- Department of Odontology, Tours University Hospital, 37000 Tours, France; (R.M.); (P.M.); (A.D.)
- Faculty of Dentistry, Nantes University, 44000 Nantes, France;
- EA 75-05 Education, Ethique, Santé, Faculté de Médecine, Université François-Rabelais, 37044 Tours, France
- Correspondence: ; Tel.: +33-6-7715-6968
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Thomas C, Minty M, Vinel A, Canceill T, Loubières P, Burcelin R, Kaddech M, Blasco-Baque V, Laurencin-Dalicieux S. Oral Microbiota: A Major Player in the Diagnosis of Systemic Diseases. Diagnostics (Basel) 2021; 11:1376. [PMID: 34441309 PMCID: PMC8391932 DOI: 10.3390/diagnostics11081376] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 07/28/2021] [Accepted: 07/28/2021] [Indexed: 02/06/2023] Open
Abstract
The oral cavity is host to a complex and diverse microbiota community which plays an important role in health and disease. Major oral infections, i.e., caries and periodontal diseases, are both responsible for and induced by oral microbiota dysbiosis. This dysbiosis is known to have an impact on other chronic systemic diseases, whether triggering or aggravating them, making the oral microbiota a novel target in diagnosing, following, and treating systemic diseases. In this review, we summarize the major roles that oral microbiota can play in systemic disease development and aggravation and also how novel tools can help investigate this complex ecosystem. Finally, we describe new therapeutic approaches based on oral bacterial recolonization or host modulation therapies. Collaboration in diagnosis and treatment between oral specialists and general health specialists is of key importance in bridging oral and systemic health and disease and improving patients' wellbeing.
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Affiliation(s)
- Charlotte Thomas
- INSERM UMR 1297 Inserm, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Avenue Jean Poulhès 1, CEDEX 4, 31432 Toulouse, France; (A.V.); (P.L.); (R.B.); (V.B.-B.)
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
- Service d’Odontologie Rangueil, CHU de Toulouse, 3 Chemin des Maraîchers, CEDEX 9, 31062 Toulouse, France
| | - Matthieu Minty
- INSERM UMR 1297 Inserm, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Avenue Jean Poulhès 1, CEDEX 4, 31432 Toulouse, France; (A.V.); (P.L.); (R.B.); (V.B.-B.)
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
- Service d’Odontologie Rangueil, CHU de Toulouse, 3 Chemin des Maraîchers, CEDEX 9, 31062 Toulouse, France
| | - Alexia Vinel
- INSERM UMR 1297 Inserm, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Avenue Jean Poulhès 1, CEDEX 4, 31432 Toulouse, France; (A.V.); (P.L.); (R.B.); (V.B.-B.)
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
- Service d’Odontologie Rangueil, CHU de Toulouse, 3 Chemin des Maraîchers, CEDEX 9, 31062 Toulouse, France
| | - Thibault Canceill
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
- Service d’Odontologie Rangueil, CHU de Toulouse, 3 Chemin des Maraîchers, CEDEX 9, 31062 Toulouse, France
- UMR CNRS 5085, Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux (CIRIMAT), Université Paul Sabatier, 35 Chemin des Maraichers, CEDEX 9, 31062 Toulouse, France
| | - Pascale Loubières
- INSERM UMR 1297 Inserm, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Avenue Jean Poulhès 1, CEDEX 4, 31432 Toulouse, France; (A.V.); (P.L.); (R.B.); (V.B.-B.)
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
| | - Remy Burcelin
- INSERM UMR 1297 Inserm, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Avenue Jean Poulhès 1, CEDEX 4, 31432 Toulouse, France; (A.V.); (P.L.); (R.B.); (V.B.-B.)
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
| | - Myriam Kaddech
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
- Service d’Odontologie Rangueil, CHU de Toulouse, 3 Chemin des Maraîchers, CEDEX 9, 31062 Toulouse, France
| | - Vincent Blasco-Baque
- INSERM UMR 1297 Inserm, Institut des Maladies Métaboliques et Cardiovasculaires (I2MC), Avenue Jean Poulhès 1, CEDEX 4, 31432 Toulouse, France; (A.V.); (P.L.); (R.B.); (V.B.-B.)
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
- Service d’Odontologie Rangueil, CHU de Toulouse, 3 Chemin des Maraîchers, CEDEX 9, 31062 Toulouse, France
| | - Sara Laurencin-Dalicieux
- Faculté de Chirurgie Dentaire, Université Paul Sabatier III (UPS), 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France; (T.C.); (M.K.); (S.L.-D.)
- Service d’Odontologie Rangueil, CHU de Toulouse, 3 Chemin des Maraîchers, CEDEX 9, 31062 Toulouse, France
- INSERM UMR 1295, Centre d’Epidémiologie et de Recherche en Santé des Populations de Toulouse (CERPOP), Epidémiologie et Analyse en Santé Publique, Risques, Maladies Chroniques et Handicaps, 37 Allées Jules Guesdes, 31000 Toulouse, France
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Park SY, Hwang BO, Lim M, Ok SH, Lee SK, Chun KS, Park KK, Hu Y, Chung WY, Song NY. Oral-Gut Microbiome Axis in Gastrointestinal Disease and Cancer. Cancers (Basel) 2021; 13:2124. [PMID: 33924899 PMCID: PMC8125773 DOI: 10.3390/cancers13092124] [Citation(s) in RCA: 84] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/05/2021] [Accepted: 03/09/2021] [Indexed: 02/07/2023] Open
Abstract
It is well-known that microbiota dysbiosis is closely associated with numerous diseases in the human body. The oral cavity and gut are the two largest microbial habitats, playing a major role in microbiome-associated diseases. Even though the oral cavity and gut are continuous regions connected through the gastrointestinal tract, the oral and gut microbiome profiles are well-segregated due to the oral-gut barrier. However, the oral microbiota can translocate to the intestinal mucosa in conditions of the oral-gut barrier dysfunction. Inversely, the gut-to-oral microbial transmission occurs as well in inter- and intrapersonal manners. Recently, it has been reported that oral and gut microbiomes interdependently regulate physiological functions and pathological processes. Oral-to-gut and gut-to-oral microbial transmissions can shape and/or reshape the microbial ecosystem in both habitats, eventually modulating pathogenesis of disease. However, the oral-gut microbial interaction in pathogenesis has been underappreciated to date. Here, we will highlight the oral-gut microbiome crosstalk and its implications in the pathogenesis of the gastrointestinal disease and cancer. Better understanding the role of the oral-gut microbiome axis in pathogenesis will be advantageous for precise diagnosis/prognosis and effective treatment.
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Affiliation(s)
- Se-Young Park
- Department of Applied Life Science, The Graduate School, Yonsei University, and BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea; (S.-Y.P.); (B.-O.H.); (S.-H.O.)
| | - Byeong-Oh Hwang
- Department of Applied Life Science, The Graduate School, Yonsei University, and BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea; (S.-Y.P.); (B.-O.H.); (S.-H.O.)
| | - Mihwa Lim
- Department of Oral Biology, Yonsei University College of Dentistry, Seoul 03722, Korea; (M.L.); (S.-K.L.); (K.-K.P.)
| | - Seung-Ho Ok
- Department of Applied Life Science, The Graduate School, Yonsei University, and BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea; (S.-Y.P.); (B.-O.H.); (S.-H.O.)
| | - Sun-Kyoung Lee
- Department of Oral Biology, Yonsei University College of Dentistry, Seoul 03722, Korea; (M.L.); (S.-K.L.); (K.-K.P.)
| | - Kyung-Soo Chun
- College of Pharmacy, Keimyung University, Daegu 42601, Korea;
| | - Kwang-Kyun Park
- Department of Oral Biology, Yonsei University College of Dentistry, Seoul 03722, Korea; (M.L.); (S.-K.L.); (K.-K.P.)
| | - Yinling Hu
- Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD 21702, USA;
| | - Won-Yoon Chung
- Department of Oral Biology, Oral Cancer Research Institute, and BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea;
| | - Na-Young Song
- Department of Oral Biology, Yonsei University College of Dentistry, Seoul 03722, Korea; (M.L.); (S.-K.L.); (K.-K.P.)
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Hill-Yardin EL, Grabrucker AM, Franks AE, Luna RA, Monif M. Editorial: Interactions of the Nervous System With Bacteria. Front Neurosci 2021; 15:682744. [PMID: 33967691 PMCID: PMC8102789 DOI: 10.3389/fnins.2021.682744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 03/29/2021] [Indexed: 11/25/2022] Open
Affiliation(s)
- Elisa L Hill-Yardin
- School of Health and Biomedical Sciences, Science Technology Engineering Mathematics College, Royal Melbourne Institute of Technology University, Bundoora, VIC, Australia.,Department of Anatomy and Physiology, The University of Melbourne, Melbourne, VIC, Australia
| | - Andreas M Grabrucker
- Department of Biological Sciences, University of Limerick, Limerick, Ireland.,Health Research Institute, University of Limerick, Limerick, Ireland.,Bernal Institute, University of Limerick, Limerick, Ireland
| | - Ashley E Franks
- School of Life Sciences, La Trobe University, Bundoora, VIC, Australia
| | - Ruth Ann Luna
- Texas Children's Microbiome Center, Texas Children's Hospital, Houston, TX, United States.,Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX, United States
| | - Mastura Monif
- Department of Anatomy and Physiology, The University of Melbourne, Melbourne, VIC, Australia.,Department of Neuroscience, Monash University, Melbourne, VIC, Australia
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Impact of Gut Microbiome Manipulation in 5xFAD Mice on Alzheimer's Disease-Like Pathology. Microorganisms 2021; 9:microorganisms9040815. [PMID: 33924322 PMCID: PMC8069338 DOI: 10.3390/microorganisms9040815] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 03/29/2021] [Accepted: 04/08/2021] [Indexed: 12/11/2022] Open
Abstract
The gut brain axis seems to modulate various psychiatric and neurological disorders such as Alzheimer's disease (AD). Growing evidence has led to the assumption that the gut microbiome might contribute to or even present the nucleus of origin for these diseases. In this regard, modifiers of the microbial composition might provide attractive new therapeutics. Aim of our study was to elucidate the effect of a rigorously changed gut microbiome on pathological hallmarks of AD. 5xFAD model mice were treated by antibiotics or probiotics (L. acidophilus and L. rhamnosus) for 14 weeks. Pathogenesis was measured by nest building capability and plaque deposition. The gut microbiome was affected as expected: antibiotics significantly reduced viable commensals, while probiotics transiently increased Lactobacillaceae. Nesting score, however, was only improved in antibiotics-treated mice. These animals additionally displayed reduced plaque load in the hippocampus. While various physiological parameters were not affected, blood sugar was reduced and serum glucagon level significantly elevated in the antibiotics-treated animals together with a reduction in the receptor for advanced glycation end products RAGE-the inward transporter of Aβ peptides of the brain. Assumedly, the beneficial effect of the antibiotics was based on their anti-diabetic potential.
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Oral–Gut Microbiome Axis in Gastrointestinal Disease and Cancer. Cancers (Basel) 2021. [DOI: 10.3390/cancers13071748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
It is well-known that microbiota dysbiosis is closely associated with numerous diseases in the human body. The oral cavity and gut are the two largest microbial habitats, playing a major role in microbiome-associated diseases. Even though the oral cavity and gut are continuous regions connected through the gastrointestinal tract, the oral and gut microbiome profiles are well-segregated due to the oral–gut barrier. However, the oral microbiota can translocate to the intestinal mucosa in conditions of the oral–gut barrier dysfunction. Inversely, the gut-to-oral microbial transmission occurs as well in inter- and intrapersonal manners. Recently, it has been reported that oral and gut microbiomes interdependently regulate physiological functions and pathological processes. Oral-to-gut and gut-to-oral microbial transmissions can shape and/or reshape the microbial ecosystem in both habitats, eventually modulating pathogenesis of disease. However, the oral–gut microbial interaction in pathogenesis has been underappreciated to date. Here, we will highlight the oral–gut microbiome crosstalk and its implications in the pathogenesis of the gastrointestinal disease and cancer. Better understanding the role of the oral–gut microbiome axis in pathogenesis will be advantageous for precise diagnosis/prognosis and effective treatment.
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Boziki M, Grigoriadis N, Papaefthymiou A, Doulberis M, Polyzos SA, Gavalas E, Deretzi G, Karafoulidou E, Kesidou E, Taloumtzis C, Theotokis P, Sofou E, Katsinelos P, Vardaka E, Fludaras I, Touloumtzi M, Koukoufiki A, Simeonidou C, Liatsos C, Kountouras J. The trimebutine effect on Helicobacter pylori-related gastrointestinal tract and brain disorders: A hypothesis. Neurochem Int 2021; 144:104938. [PMID: 33535070 DOI: 10.1016/j.neuint.2020.104938] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 11/17/2020] [Accepted: 12/09/2020] [Indexed: 02/07/2023]
Abstract
The localization of bacterial components and/or metabolites in the central nervous system may elicit neuroinflammation and/or neurodegeneration. Helicobacter pylori (a non-commensal symbiotic gastrointestinal pathogen) infection and its related metabolic syndrome have been implicated in the pathogenesis of gastrointestinal tract and central nervous system disorders, thus medications affecting the nervous system - gastrointestinal tract may shape the potential of Helicobacter pylori infection to trigger these pathologies. Helicobacter pylori associated metabolic syndrome, by impairing gut motility and promoting bacterial overgrowth and translocation, might lead to brain pathologies. Trimebutine maleate is a prokinetic drug that hastens gastric emptying, by inducing the release of gastrointestinal agents such as motilin and gastrin. Likewise, it appears to protect against inflammatory signal pathways, involved in inflammatory disorders including brain pathologies. Trimebutine maleate also acts as an antimicrobial agent and exerts opioid agonist effect. This study aimed to investigate a hypothesis regarding the recent advances in exploring the potential role of gastrointestinal tract microbiota dysbiosis-related metabolic syndrome and Helicobacter pylori in the pathogenesis of gastrointestinal tract and brain diseases. We hereby proposed a possible neuroprotective role for trimebutine maleate by altering the dynamics of the gut-brain axis interaction, thus suggesting an additional effect of trimebutine maleate on Helicobacter pylori eradication regimens against these pathologies.
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Affiliation(s)
- Marina Boziki
- Second Neurological Department, Aristotle University of Thessaloniki, AHEPA University General Hospital of Thessaloniki, Thessaloniki, 54636, Macedonia, Greece
| | - Nikolaos Grigoriadis
- Second Neurological Department, Aristotle University of Thessaloniki, AHEPA University General Hospital of Thessaloniki, Thessaloniki, 54636, Macedonia, Greece
| | - Apostolis Papaefthymiou
- Department of Gastroenterology, University Hospital of Larissa, Larissa, 41110, Greece; Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece; First Laboratory of Pharmacology, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece
| | - Michael Doulberis
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece; First Laboratory of Pharmacology, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece; Division of Gastroenterology and Hepatology, Medical University Department, Kantonsspital Aarau, Aarau, 5001, Switzerland
| | - Stergios A Polyzos
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece; First Laboratory of Pharmacology, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Macedonia, Greece
| | - Emmanuel Gavalas
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece
| | - Georgia Deretzi
- Department of Neurology, Papageorgiou General Hospital, Thessaloniki, 56429, Macedonia, Greece
| | - Eleni Karafoulidou
- Second Neurological Department, Aristotle University of Thessaloniki, AHEPA University General Hospital of Thessaloniki, Thessaloniki, 54636, Macedonia, Greece
| | - Evangelia Kesidou
- Second Neurological Department, Aristotle University of Thessaloniki, AHEPA University General Hospital of Thessaloniki, Thessaloniki, 54636, Macedonia, Greece
| | - Charilaos Taloumtzis
- Second Neurological Department, Aristotle University of Thessaloniki, AHEPA University General Hospital of Thessaloniki, Thessaloniki, 54636, Macedonia, Greece; 424 General Military Hospital of Thessaloniki, Department of Gastroenterology, Thessaloniki, 56429, Macedonia, Greece
| | - Paschalis Theotokis
- Second Neurological Department, Aristotle University of Thessaloniki, AHEPA University General Hospital of Thessaloniki, Thessaloniki, 54636, Macedonia, Greece
| | - Electra Sofou
- Second Neurological Department, Aristotle University of Thessaloniki, AHEPA University General Hospital of Thessaloniki, Thessaloniki, 54636, Macedonia, Greece
| | - Panagiotis Katsinelos
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece
| | - Elisabeth Vardaka
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece; Department of Nutritional Sciences and Dietetics, School of Health Sciences, International Hellenic University, Alexander Campus, 574 00, Thessaloniki, Macedonia, Greece
| | - Ioannis Fludaras
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece
| | - Maria Touloumtzi
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece
| | - Argiro Koukoufiki
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece
| | - Constantina Simeonidou
- Laboratory of Experimental Physiology, Department of Physiology and Pharmacology, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, 54124, Macedonia, Greece
| | - Christos Liatsos
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece; Department of Gastroenterology, 401 Army General Hospital of Athens, Athens, 115 25, Greece
| | - Jannis Kountouras
- Department of Internal Medicine, Second Medical Clinic, Ippokration Hospital, Aristotle University of Thessaloniki, Thessaloniki, 546 42, Macedonia, Greece.
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Hu Y, Chen Y, Lin L, Zhang J, Lan R, Wu B. Studies on antimicrobial peptide-loaded nanomaterial for root caries restorations to inhibit periodontitis related pathogens in periodontitis care. J Microencapsul 2021; 38:89-99. [PMID: 33153344 DOI: 10.1080/02652048.2020.1842528] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
AIMS To prepare a novel antimicrobial peptide Nal-P-113 loaded poly (ethylene glycol) combined chitosan nanoparticles (Nal-P-113-PEG-CSNPs) for root caries restorations to control the periodontitis related pathogens in periodontitis care. METHODS Nanoparticles were prepared by simple polymerisation method and characterised using effective analytical methods (TEM, UV, etc.). The antimicrobial activity and biofilm formation of Nal-P-113-PEG-CSNPs was tested against periodontal bacterial pathogens by different in vitro methods. RESULTS The size of Nal-P-113 loaded PEG-Chitosn nanoparticles was 216.2 ± 1.6 nm. The drug encapsulation efficiency (%EE (w/w) of Nal-P-113-PEG-CSNPs was found to be 89.33 ± 1.67% (w/w). The antimicrobial examination showed that prepared NPs have effectively inhibited the growth of Fusobacterium nucleatum, Streptococcus gordonii, and Porphyromonas gingivalis with the MIC of 23 µg/mL, 6 µg/mL and 31 µg/mL, respectively. CONCLUSIONS The prepared antimicrobial peptide-loaded PEG-CSNPs provide excellent in vitro efficiency but, further studies are necessary to confirm its therapeutic efficacy on periodontitis care.
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Affiliation(s)
- Yuqian Hu
- Department of Stomatology, College of Stomatology, Southern Medical University, Guangzhou, China.,Institute of Molecular Medicine, Medical College of Eastern Liaoning University, Dandong, China
| | - Yan Chen
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Lijuan Lin
- Institute of Molecular Medicine, Medical College of Eastern Liaoning University, Dandong, China
| | - Jinhui Zhang
- Institute of Molecular Medicine, Medical College of Eastern Liaoning University, Dandong, China
| | - Rengang Lan
- Institute of Molecular Medicine, Medical College of Eastern Liaoning University, Dandong, China
| | - Buling Wu
- Department of Stomatology, College of Stomatology, Southern Medical University, Guangzhou, China.,Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
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Hao Y, Tang C, Du Q, Zhou X, Peng X, Cheng L. Comparative analysis of oral microbiome from Zang and Han populations living at different altitudes. Arch Oral Biol 2020; 121:104986. [PMID: 33246246 DOI: 10.1016/j.archoralbio.2020.104986] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 11/03/2020] [Accepted: 11/04/2020] [Indexed: 12/13/2022]
Abstract
OBJECTIVES The aim of this study was to obtain greater insight into the environmental and genetic factors affecting the oral microbiome. DESIGN To this end, we investigated the oral microbiome composition in Han and Zang populations living at different altitudes. The saliva microbiome in 115 individuals from Zang and Han populations living at different altitudes was analyzed using the 16 s rRNA gene sequencing method on the Illumina MiSeq platform. The dominant species in the oral microbiome were verified by quantitative real-time polymerase chain reaction (qPCR) analysis. RESULTS The Han population, living at an altitude of 500 m, had higher microbiome diversity than the Zang population living at altitudes of 3000-4000 m. People living at 3000 m had a higher relative abundance of Leptothrix genus, but people living at 500 m had a higher relative abundance of Capnocytophaga genus according to Lefse difference analysis (P < 0.05). Compared to the Zang population, the Han population had higher relative abundances of Porphyromonas and Treponema genus organisms, especially Porphyromonas (P < 0.001). qPCR analysis confirmed that people living at high altitudes had the highest relative abundance of Porphyromonas gingivalis (P < 0.01). CONCLUSIONS This study showed that both genetics and the environment had significant influences on the oral microbiome composition. The study proposed a meaningful research direction to explore the relationship between different ethnic and altitude groups and oral diseases, such as periodontal diseases.
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Affiliation(s)
- Yu Hao
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Cariology and Endodontics West China School of Stomatology, Sichuan University, Chengdu 610041, China.
| | - Can Tang
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Cariology and Endodontics West China School of Stomatology, Sichuan University, Chengdu 610041, China; Department of Stomatology, Hospital of Chengdu Office of People's Government of Tibetan Autonomous Region, Chengdu 610041, China.
| | - Qilian Du
- Department of Stomatology, Hospital of Chengdu Office of People's Government of Tibetan Autonomous Region, Chengdu 610041, China.
| | - Xuedong Zhou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Cariology and Endodontics West China School of Stomatology, Sichuan University, Chengdu 610041, China.
| | - Xian Peng
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Cariology and Endodontics West China School of Stomatology, Sichuan University, Chengdu 610041, China.
| | - Lei Cheng
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Cariology and Endodontics West China School of Stomatology, Sichuan University, Chengdu 610041, China.
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Paraskevaidi M, Allsop D, Karim S, Martin FL, Crean S. Diagnostic Biomarkers for Alzheimer's Disease Using Non-Invasive Specimens. J Clin Med 2020; 9:jcm9061673. [PMID: 32492907 PMCID: PMC7356561 DOI: 10.3390/jcm9061673] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 05/26/2020] [Accepted: 05/27/2020] [Indexed: 12/11/2022] Open
Abstract
Studies in the field of Alzheimer’s disease (AD) have shown the emergence of biomarkers in biologic fluids that hold great promise for the diagnosis of the disease. A diagnosis of AD at a presymptomatic or early stage may be the key for a successful treatment, with clinical trials currently investigating this. It is anticipated that preventative and therapeutic strategies may be stage-dependent, which means that they have a better chance of success at a very early stage—before critical neurons are lost. Several studies have been investigating the use of cerebrospinal fluid (CSF) and blood as clinical samples for the detection of AD with a number of established core markers, such as amyloid beta (Aβ), total tau (T-tau) and phosphorylated tau (P-tau), being at the center of clinical research interest. The use of oral samples—including saliva and buccal mucosal cells—falls under one of the least-investigated areas in AD diagnosis. Such samples have great potential to provide a completely non-invasive alternative to current CSF and blood sampling procedures. The present work is a thorough review of the results and analytical approaches, including proteomics, metabolomics, spectroscopy and microbiome analyses that have been used for the study and detection of AD using salivary samples and buccal cells. With a few exceptions, most of the studies utilizing oral samples were performed in small cohorts, which in combination with the existence of contradictory results render it difficult to come to a definitive conclusion on the value of oral markers. Proteins such as Aβ, T-tau and P-tau, as well as small metabolites, were detected in saliva and have shown some potential as future AD diagnostics. Future large-cohort studies and standardization of sample preparation and (pre-)analytical factors are necessary to determine the use of these non-invasive samples as a diagnostic tool for AD.
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Affiliation(s)
- Maria Paraskevaidi
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston PR1 2HE, UK; (F.L.M.); (S.C.)
- Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London W12 0NN, UK
- Correspondence: ; Tel.: +44-074-7900-6626
| | - David Allsop
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Lancaster LA1 4YW, UK;
| | - Salman Karim
- Central Lancashire Memory Assessment Service, Lancashire Care NHS Foundation Trust, Bamber Bridge, Preston PR5 6YA, UK;
| | - Francis L. Martin
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston PR1 2HE, UK; (F.L.M.); (S.C.)
| | - StJohn Crean
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston PR1 2HE, UK; (F.L.M.); (S.C.)
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Boullerne AI, Adami GR, Schwartz JL, Skias D, Maienschein-Cline M, Green SJ, Feinstein DL. Deep DNA metagenomic sequencing reveals oral microbiome divergence between monozygotic twins discordant for multiple sclerosis severity. J Neuroimmunol 2020; 343:577237. [PMID: 32289594 DOI: 10.1016/j.jneuroim.2020.577237] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 03/06/2020] [Accepted: 04/06/2020] [Indexed: 12/17/2022]
Abstract
In contrast to gut, the oral microbiome of MS patients has not been characterized. Deep sequencing of saliva DNA from a pair of monozygotic twins (MSF1 with relapsing remitting MS; MSF2 with clinically isolated syndrome) identified 2036 bacterial species. Relative abundances of 3 phyla were higher, and 3 lower in MSF1 versus MSF2. Species diversity was greater in MSF2, and 20 abundant species differed at least 2-fold. Pathway analysis identified 116 functional hierarchies differing 50% or more. Although limited to one pair of twins, our data suggests that oral microbiome analysis may be useful for diagnosis or monitoring therapeutic efficacy.
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Affiliation(s)
- Anne I Boullerne
- Department of Anesthesiology, University of Illinois, Chicago, IL, USA.
| | - Guy R Adami
- Department of Oral Medicine and Diagnostic Services, University of Illinois, Chicago, IL, USA
| | - Joel L Schwartz
- Department of Oral Medicine and Diagnostic Services, University of Illinois, Chicago, IL, USA
| | - Demetrios Skias
- Department of Neurology and Rehabilitation, University of Illinois, Chicago, IL, USA
| | | | - Stefan J Green
- Research Resources Center, University of Illinois, Chicago, IL, USA
| | - Douglas L Feinstein
- Department of Anesthesiology, University of Illinois, Chicago, IL, USA; Jesse Brown VA Medical Center, Chicago, IL, USA.
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Askarova S, Umbayev B, Masoud AR, Kaiyrlykyzy A, Safarova Y, Tsoy A, Olzhayev F, Kushugulova A. The Links Between the Gut Microbiome, Aging, Modern Lifestyle and Alzheimer's Disease. Front Cell Infect Microbiol 2020; 10:104. [PMID: 32257964 PMCID: PMC7093326 DOI: 10.3389/fcimb.2020.00104] [Citation(s) in RCA: 94] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 02/27/2020] [Indexed: 12/16/2022] Open
Abstract
Gut microbiome is a community of microorganisms in the gastrointestinal tract. These bacteria have a tremendous impact on the human physiology in healthy individuals and during an illness. Intestinal microbiome can influence one's health either directly by secreting biologically active substances such as vitamins, essential amino acids, lipids et cetera or indirectly by modulating metabolic processes and the immune system. In recent years considerable information has been accumulated on the relationship between gut microbiome and brain functions. Moreover, significant quantitative and qualitative changes of gut microbiome have been reported in patients with Alzheimer's disease. On the other hand, gut microbiome is highly sensitive to negative external lifestyle aspects, such as diet, sleep deprivation, circadian rhythm disturbance, chronic noise, and sedentary behavior, which are also considered as important risk factors for the development of sporadic Alzheimer's disease. In this regard, this review is focused on analyzing the links between gut microbiome, modern lifestyle, aging, and Alzheimer's disease.
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Affiliation(s)
- Sholpan Askarova
- National Laboratory Astana, Center for Life Sciences, Nazarbayev University, Nur-Sultan, Kazakhstan
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