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Wu B, Luo H, Tan C, Qi X, Sloan FA, Kamer AR, Schwartz MD, Martinez M, Plassman BL. Diabetes, Edentulism, and Cognitive Decline: A 12-Year Prospective Analysis. J Dent Res 2023:220345231155825. [PMID: 36908186 PMCID: PMC10399080 DOI: 10.1177/00220345231155825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2023] Open
Abstract
Diabetes mellitus (DM) is a recognized risk factor for dementia, and increasing evidence shows that tooth loss is associated with cognitive impairment and dementia. However, the effect of the co-occurrence of DM and edentulism on cognitive decline is understudied. This 12-y cohort study aimed to assess the effect of the co-occurrence of DM and edentulism on cognitive decline and examine whether the effect differs by age group. Data were drawn from the 2006 to 2018 Health and Retirement Study. The study sample included 5,440 older adults aged 65 to 74 y, 3,300 aged 75 to 84 y, and 1,208 aged 85 y or older. Linear mixed-effect regression was employed to model the rates of cognitive decline stratified by age cohorts. Compared with their counterparts with neither DM nor edentulism at baseline, older adults aged 65 to 74 y (β = -1.12; 95% confidence interval [CI], -1.56 to -0.65; P < 0.001) and those aged 75 to 84 y with both conditions (β = -1.35; 95% CI, -2.09 to -0.61; P < 0.001) had a worse cognitive function. For the rate of cognitive decline, compared to those with neither condition from the same age cohort, older adults aged 65 to 74 y with both conditions declined at a higher rate (β = -0.15; 95% CI, -0.20 to -0.10; P < 0.001). Having DM alone led to an accelerated cognitive decline in older adults aged 65 to 74 y (β = -0.09; 95% CI, -0.13 to -0.05; P < 0.001); having edentulism alone led to an accelerated decline in older adults aged 65 to 74 y (β = -0.13; 95% CI, -0.17 to -0.08; P < 0.001) and older adults aged 75 to 84 (β = -0.10; 95% CI, -0.17 to -0.03; P < 0.01). Our study finds the co-occurrence of DM and edentulism led to a worse cognitive function and a faster cognitive decline in older adults aged 65 to 74 y.
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Affiliation(s)
- B Wu
- Rory Meyers College of Nursing, New York University, New York, NY, USA
| | - H Luo
- Brody School of Medicine, East Carolina University, Greenville, NC, USA
| | - C Tan
- Rory Meyers College of Nursing, New York University, New York, NY, USA
| | - X Qi
- Rory Meyers College of Nursing, New York University, New York, NY, USA
| | - F A Sloan
- Department of Economics, Duke University, Durham, NC, USA
| | - A R Kamer
- College of Dentistry, New York University, New York, NY, USA
| | - M D Schwartz
- Grossman School of Medicine, New York University, New York, NY, USA
| | - M Martinez
- Department of Biology, Duke University, Durham, NC, USA
| | - B L Plassman
- Department of Psychiatry and Behavioral Sciences, Duke University, Durham, NC, USA
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Tang V, Hamidi B, Janal MN, Barber CA, Godder B, Palomo L, Kamer AR. Periodontal Inflamed Surface Area (PISA) associates with composites of salivary cytokines. PLoS One 2023; 18:e0280333. [PMID: 36791096 PMCID: PMC9931150 DOI: 10.1371/journal.pone.0280333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 12/27/2022] [Indexed: 02/16/2023] Open
Abstract
BACKGROUND Periodontal disease (PerioD) is a chronic, complex inflammatory condition resulting from the interaction between subgingival dysbiotic bacteria and the host immune response leading to local inflammation. Since periodontal inflammation is characterized by multiple cytokines effects we investigated whether Periodontal Inflamed Surface Area (PISA), a continuous measure of clinical periodontal inflammation is a predictor of composite indexes of salivary cytokines. METHODS AND FINDINGS In a cross-sectional study of 67 healthy, well-educated individuals, we evaluated PISA and several cytokines expressed in whole stimulated saliva. Two salivary cytokine indexes were constructed using weighted and unweighted approaches based on a Principal Component Analysis [named Cytokine Component Index (CCI)] or averaging the (standardized) level of all cytokines [named Composite Inflammatory Index (CII)]. In regression analysis we found that PISA scores were significantly associated with both salivary cytokine constructs, (CCI: part R = 0.51, p<0.001; CII: part R = 0.40, p = 0.001) independent of age, gender and BMI showing that single scores summarizing salivary cytokines correlated with severity of clinical periodontal inflammation. CONCLUSIONS Clinical periodontal inflammation may be reflected by a single score encompassing several salivary cytokines. These results are consistent with the complexity of interactions characterizing periodontal disease. In addition, Type I error is likely to be avoided.
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Affiliation(s)
- Vera Tang
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, New York, United States of America
| | - Bubak Hamidi
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, New York, United States of America
| | - Malvin N. Janal
- Department of Epidemiology and Health Promotion, College of Dentistry, New York University, New York, New York, United States of America
| | - Cheryl A. Barber
- Department of Basic Sciences and Craniofacial Biology, College of Dentistry, New York University, New York, New York, United States of America
| | - Benjamin Godder
- Cariology and Comprehensive Care, College of Dentistry, New York University, New York, New York, United States of America
| | - Leena Palomo
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, New York, United States of America
| | - Angela R. Kamer
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, New York, United States of America
- * E-mail:
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Guo Y, Xu F, Thomas SC, Zhang Y, Paul B, Sakilam S, Chae S, Li P, Almeter C, Kamer AR, Arora P, Graves DT, Saxena D, Li X. Targeting the succinate receptor effectively inhibits periodontitis. Cell Rep 2022; 40:111389. [PMID: 36130514 PMCID: PMC9533417 DOI: 10.1016/j.celrep.2022.111389] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 05/06/2022] [Accepted: 08/30/2022] [Indexed: 11/25/2022] Open
Abstract
Periodontal disease (PD) is one of the most common inflammatory diseases in humans and is initiated by an oral microbial dysbiosis that stimulates inflammation and bone loss. Here, we report an abnormal elevation of succinate in the subgingival plaque of subjects with severe PD. Succinate activates succinate receptor-1 (SUCNR1) and stimulates inflammation. We detected SUCNR1 expression in the human and mouse periodontium and hypothesize that succinate activates SUCNR1 to accelerate periodontitis through the inflammatory response. Administration of exogenous succinate enhanced periodontal disease, whereas SUCNR1 knockout mice were protected from inflammation, oral dysbiosis, and subsequent periodontal bone loss in two different models of periodontitis. Therapeutic studies demonstrated that a SUCNR1 antagonist inhibited inflammatory events and osteoclastogenesis in vitro and reduced periodontal bone loss in vivo. Our study reveals succinate’s effect on periodontitis pathogenesis and provides a topical treatment for this disease. Periodontitis is the most prevalent adult oral disease. Guo et al. show elevation of succinate in periodontitis, which aggravates the disease through the succinate receptor (SUCNR1). They developed a gel formulation of a small compound specifically blocking SUCNR1 to prevent and treat periodontitis by inhibiting dysbiosis, inflammation, and bone loss.
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Affiliation(s)
- Yuqi Guo
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA
| | - Fangxi Xu
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA
| | - Scott C Thomas
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA
| | - Yanli Zhang
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA
| | - Bidisha Paul
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA
| | - Satish Sakilam
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Sungpil Chae
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA
| | - Patty Li
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA
| | - Caleb Almeter
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA
| | - Angela R Kamer
- Department of Periodontology and Implant Dentistry, New York University College of Dentistry, New York, NY 10010, USA
| | - Paramjit Arora
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Dana T Graves
- Department of Periodontics, University of Pennsylvania School of Dental Medicine, Philadelphia, PA 19104, USA
| | - Deepak Saxena
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA; Department of Surgery, New York University Grossman School of Medicine, New York, NY 10016, USA.
| | - Xin Li
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY 10010, USA; Department of Urology, New York University Grossman School of Medicine, New York, NY 10016, USA; Perlmutter Cancer Institute, New York University Langone Medical Center, New York, NY 10016, USA.
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4
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Thomas SC, Xu F, Pushalkar S, Lin Z, Thakor N, Vardhan M, Flaminio Z, Khodadadi-Jamayran A, Vasconcelos R, Akapo A, Queiroz E, Bederoff M, Janal MN, Guo Y, Aguallo D, Gordon T, Corby PM, Kamer AR, Li X, Saxena D. Electronic Cigarette Use Promotes a Unique Periodontal Microbiome. mBio 2022; 13:e0007522. [PMID: 35189698 PMCID: PMC8903898 DOI: 10.1128/mbio.00075-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 01/28/2022] [Indexed: 12/15/2022] Open
Abstract
Electronic cigarettes (e-cigs) have become prevalent as an alternative to conventional cigarette smoking, particularly in youth. E-cig aerosols contain unique chemicals which alter the oral microbiome and promote dysbiosis in ways we are just beginning to investigate. We conducted a 6-month longitudinal study involving 84 subjects who were either e-cig users, conventional smokers, or nonsmokers. Periodontal condition, cytokine levels, and subgingival microbial community composition were assessed, with periodontal, clinical, and cytokine measures reflecting cohort habit and positively correlating with pathogenic taxa (e.g., Treponema, Saccharibacteria, and Porphyromonas). α-Diversity increased similarly across cohorts longitudinally, yet each cohort maintained a unique microbiome. The e-cig microbiome shared many characteristics with the microbiome of conventional smokers and some with nonsmokers, yet it maintained a unique subgingival microbial community enriched in Fusobacterium and Bacteroidales (G-2). Our data suggest that e-cig use promotes a unique periodontal microbiome, existing as a stable heterogeneous state between those of conventional smokers and nonsmokers and presenting unique oral health challenges. IMPORTANCE Electronic cigarette (e-cig) use is gaining in popularity and is often perceived as a healthier alternative to conventional smoking. Yet there is little evidence of the effects of long-term use of e-cigs on oral health. Conventional cigarette smoking is a prominent risk factor for the development of periodontitis, an oral disease affecting nearly half of adults over 30 years of age in the United States. Periodontitis is initiated through a disturbance in the microbial biofilm communities inhabiting the unique space between teeth and gingival tissues. This disturbance instigates host inflammatory and immune responses and, if left untreated, leads to tooth and bone loss and systemic diseases. We found that the e-cig user's periodontal microbiome is unique, eliciting unique host responses. Yet some similarities to the microbiomes of both conventional smokers and nonsmokers exist, with strikingly more in common with that of cigarette smokers, suggesting that there is a unique periodontal risk associated with e-cig use.
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Affiliation(s)
- Scott C. Thomas
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Fangxi Xu
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Smruti Pushalkar
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Ziyan Lin
- Applied Bioinformatics Labs, New York University School of Medicine, New York, New York, USA
| | - Nirali Thakor
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Mridula Vardhan
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Zia Flaminio
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | | | - Rebeca Vasconcelos
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Adenike Akapo
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Erica Queiroz
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Maria Bederoff
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Malvin N. Janal
- Department of Epidemiology & Health Promotion, New York University College of Dentistry, New York, New York, USA
| | - Yuqi Guo
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Deanna Aguallo
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Terry Gordon
- Department of Environmental Medicine, New York University School of Medicine, New York, New York, USA
| | - Patricia M. Corby
- Department of Oral Medicine, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Angela R. Kamer
- Department of Periodontology and Implant Dentistry, New York University College of Dentistry, New York, New York, USA
| | - Xin Li
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
| | - Deepak Saxena
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, New York, USA
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5
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Xu F, Pushalkar S, Lin Z, Thomas SC, Persaud JK, Sierra MA, Vardhan M, Vasconcelos R, Akapo A, Guo Y, Gordon T, Corby PM, Kamer AR, Li X, Saxena D. Electronic cigarette use enriches periodontal pathogens. Mol Oral Microbiol 2022; 37:63-76. [PMID: 34997976 DOI: 10.1111/omi.12361] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 01/03/2022] [Accepted: 01/06/2022] [Indexed: 11/28/2022]
Abstract
The effect of electronic cigarette (e-cigarette) smoking, especially its long-term impact on oral health, is poorly understood. Here, we conducted a longitudinal clinical study with two study visits, 6 months apart, to investigate the effect of e-cigarette use on the bacterial community structure in the saliva of 101 periodontitis patients. Our data demonstrated that e-cigarette use altered the oral microbiome in periodontitis patients, enriching members of the Filifactor, Treponema, and Fusobacterium taxa. For patients at the same periodontal disease stage, cigarette smokers and e-cigarette smokers shared more similarities in their oral bacterial composition. E-cigarette smoking may have a similar potential as cigarette smoking at altering the bacterial composition of saliva over time, leading to an increase in the relative abundance of periodontal disease-associated pathogens such as Porphyromonas gingivalis and Fusobacterium nucleatum. The correlation analysis showed that certain genera, such as Dialister, Selenomonas, and Leptotrichia in the e-cigarette smoking group, were positively correlated with the levels of proinflammatory cytokines, including IFN-γ, IL-1β, and TNF-α. E-cigarette use was also associated with elevated levels of proinflammatory cytokines such as IFN-γ and TNF-α, which contribute to oral microbiome dysbiosis and advanced disease state. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Fangxi Xu
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Smruti Pushalkar
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Ziyan Lin
- Department of Medicine, New York University School of Medicine, New York, NY, United States
| | - Scott C Thomas
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Julia Kishanie Persaud
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Maria A Sierra
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Mridula Vardhan
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Rebeca Vasconcelos
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Adenike Akapo
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Yuqi Guo
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Terry Gordon
- Department of Environmental Medicine, New York University School of Medicine, New York, NY, United States
| | - Patricia M Corby
- Department of Oral Medicine, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Angela R Kamer
- Department of Periodontology and Implant Dentistry, New York University College of Dentistry, New York, NY, United States
| | - Xin Li
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Deepak Saxena
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
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Mehta NH, Sherbansky J, Kamer AR, Carare RO, Butler T, Rusinek H, Chiang GC, Li Y, Strauss S, Saint-Louis LA, Theise ND, Suss RA, Blennow K, Kaplitt M, de Leon MJ. The Brain-Nose Interface: A Potential Cerebrospinal Fluid Clearance Site in Humans. Front Physiol 2022; 12:769948. [PMID: 35058794 PMCID: PMC8764168 DOI: 10.3389/fphys.2021.769948] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 11/26/2021] [Indexed: 12/17/2022] Open
Abstract
The human brain functions at the center of a network of systems aimed at providing a structural and immunological layer of protection. The cerebrospinal fluid (CSF) maintains a physiological homeostasis that is of paramount importance to proper neurological activity. CSF is largely produced in the choroid plexus where it is continuous with the brain extracellular fluid and circulates through the ventricles. CSF movement through the central nervous system has been extensively explored. Across numerous animal species, the involvement of various drainage pathways in CSF, including arachnoid granulations, cranial nerves, perivascular pathways, and meningeal lymphatics, has been studied. Among these, there is a proposed CSF clearance route spanning the olfactory nerve and exiting the brain at the cribriform plate and entering lymphatics. While this pathway has been demonstrated in multiple animal species, evidence of a similar CSF egress mechanism involving the nasal cavity in humans remains poorly consolidated. This review will synthesize contemporary evidence surrounding CSF clearance at the nose-brain interface, examining across species this anatomical pathway, and its possible significance to human neurodegenerative disease. Our discussion of a bidirectional nasal pathway includes examination of the immune surveillance in the olfactory region protecting the brain. Overall, we expect that an expanded discussion of the brain-nose pathway and interactions with the environment will contribute to an improved understanding of neurodegenerative and infectious diseases, and potentially to novel prevention and treatment considerations.
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Affiliation(s)
- Neel H. Mehta
- Undergraduate Department of Biology, Cornell University, Ithaca, NY, United States
| | | | - Angela R. Kamer
- Department of Periodontology and Implant Dentistry, NYU College of Dentistry, New York, NY, United States
| | - Roxana O. Carare
- Department of Medicine, University of Southampton, Southampton, United Kingdom
| | - Tracy Butler
- Department of Radiology, Brain Health Imaging Institute, Weill Cornell Medicine, New York, NY, United States
| | - Henry Rusinek
- Department of Radiology, NYU Langone Health, New York, NY, United States
| | - Gloria C. Chiang
- Department of Radiology, Weill Cornell Medicine, New York, NY, United States
| | - Yi Li
- Department of Radiology, Brain Health Imaging Institute, Weill Cornell Medicine, New York, NY, United States
| | - Sara Strauss
- Department of Radiology, Weill Cornell Medicine, New York, NY, United States
| | - L. A. Saint-Louis
- Department of Radiology, NYU Langone Health, New York, NY, United States
| | - Neil D. Theise
- Department of Pathology, NYU Grossman School of Medicine, New York, NY, United States
| | - Richard A. Suss
- Division of Neuroradiology, Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Kaj Blennow
- Clinical Neurochemistry Lab, Inst. of Neuroscience and Physiology, University of Gothenburg, Sahlgrenska University Hospital, Göteborg, Sweden
| | - Michael Kaplitt
- Laboratory of Molecular Neurosurgery, Department of Neurological Surgery, Weill Cornell Medical College, New York, NY, United States
| | - Mony J. de Leon
- Department of Radiology, Brain Health Imaging Institute, Weill Cornell Medicine, New York, NY, United States
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Luo H, Tan C, Adhikari S, Plassman BL, Kamer AR, Sloan FA, Schwartz MD, Qi X, Wu B. Effects of the Co-occurrence of Diabetes Mellitus and Tooth Loss on Cognitive Function. Curr Alzheimer Res 2021; 18:1023-1031. [PMID: 34951384 DOI: 10.2174/1567205019666211223093057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 10/06/2021] [Accepted: 11/05/2021] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Both diabetes mellitus (DM) and poor oral health are common chronic conditions and risk factors of Alzheimer's disease and related dementia among older adults. This study assessed the effects of DM and complete tooth loss (TL) on cognitive function, accounting for their interactions. METHODS Longitudinal data were obtained from the 2006, 2012, and 2018 waves of the Health and Retirement Study. This cohort study included 7,805 respondents aged 65 years or older with 18,331 person-year observations. DM and complete TL were self-reported. Cognitive function was measured by the Telephone Interview for Cognitive Status. Random-effect regressions were used to test the associations, overall and stratified by sex. RESULTS Compared with older adults without neither DM nor complete TL, those with both conditions (b = -1.35, 95% confidence interval [CI]: -1.68, -1.02), with complete TL alone (b = -0.67, 95% CI: -0.88, -0.45), or with DM alone (b = -0.40, 95% CI: -0.59, -0.22), had lower cognitive scores. The impact of having both conditions was significantly greater than that of having DM alone (p < .001) or complete TL alone (p = 0.001). Sex-stratified analyses showed the effects were similar in males and females, except having DM alone was not significant in males. CONCLUSION The co-occurrence of DM and complete TL poses an additive risk for cognition. Healthcare and family-care providers should pay attention to the cognitive health of patients with both DM and complete TL. Continued efforts are needed to improve older adults' access to dental care, especially for individuals with DM.
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Affiliation(s)
- Huabin Luo
- Brody School of Medicine, East Carolina University, Greenville. United States
| | - Chenxin Tan
- Rory Meyers College of Nursing, New York University, New York. United States
| | | | | | - Angela R Kamer
- College of Dentistry, New York University, New York. United States
| | - Frank A Sloan
- Grossman School of Medicine, New York University, New York. United States
| | - Mark D Schwartz
- Grossman School of Medicine, New York University, New York. United States
| | - Xiang Qi
- Rory Meyers College of Nursing, New York University, New York. United States
| | - Bei Wu
- Rory Meyers College of Nursing, New York University, New York. United States
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Luo H, Wu B, Kamer AR, Adhikari S, Sloan F, Plassman BL, Tan C, Qi X, Schwartz MD. Oral Health, Diabetes, and Inflammation: Effects of Oral Hygiene Behaviour. Int Dent J 2021; 72:484-490. [PMID: 34857389 PMCID: PMC9259379 DOI: 10.1016/j.identj.2021.10.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 09/28/2021] [Accepted: 10/04/2021] [Indexed: 01/08/2023] Open
Abstract
Introduction The aim of this research was to assess the association between inflammation and oral health and diabetes, as well as the mediating role of oral hygiene practice in this association. Methods Data were from the 2009–2010 National Health and Nutrition Examination Survey. The analytical sample consisted of 2,191 respondents aged 50 and older. Poor oral health was clinically defined by significant tooth loss (STL) and periodontal disease (PD). Diabetes mellitus (DM) was determined by glycemic levels. The outcome variable was serum C-reactive protein (CRP) level, dichotomised as ≥1 mg/dL (elevated CRP) vs <1 mg/dL (not elevated CRP). Two path models, one using STL and DM as the independent variable, the other using PD and DM as the independent variable, were estimated to assess the direct effects of having poor oral health and DM on elevated CRP and the mediating effects of dental flossing. Results In path model 1, individuals having both STL and DM (adjusted odds ratio [AOR], 1.92; 95% confidence interval [CI], 1.30–2.82) or having STL alone (AOR, 2.30; 95% CI, 1.68–3.15) were more likely to have elevated CRP than those with neither STL nor DM; dental flossing (AOR, 0.92, 95% CI, 0.88–0.96) was associated with lower risk of elevated CRP. In path model 2, no significant association was found between having both PD and DM and elevated CRP; dental flossing (AOR, 0.91; 95% CI:, 0.86–0.94) was associated with lower risk of elevated CRP. Conclusions Findings from this study highlight the importance of improving oral health and oral hygiene practice to mitigate inflammation. Further research is needed to assess the longer-term effects of reducing inflammation.
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Affiliation(s)
- Huabin Luo
- Brody School of Medicine, East Carolina University, Greenville, North Carolina, USA.
| | - Bei Wu
- Rory Meyers College of Nursing, New York University, New York, New York, USA
| | - Angela R Kamer
- College of Dentistry, New York University, New York, New York, USA
| | | | - Frank Sloan
- Sanford School of Public Policy, Duke University, Durham, North Carolina, USA
| | | | - Chenxin Tan
- Rory Meyers College of Nursing, New York University, New York, New York, USA
| | - Xiang Qi
- Rory Meyers College of Nursing, New York University, New York, New York, USA
| | - Mark D Schwartz
- Grossman School of Medicine, New York University, New York, New York. USA
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9
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Kamkwalala AR, Garg A, Roy U, Matthews A, Castillo-Mancilla J, Lake JE, Sebastiani G, Yin M, Brown TT, Kamer AR, Jabs DA, Ellis RJ, Boffito M, Greene M, Schmalzle S, Siegler E, Erlandson KM, Moore DJ. Current Considerations for Clinical Management and Care of People with HIV: Findings from the 11th Annual International HIV and Aging Workshop. AIDS Res Hum Retroviruses 2021; 37:807-820. [PMID: 34405689 DOI: 10.1089/aid.2021.0059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The number of people with HIV (PWH) aged 50 years or older continues to steadily increase. The convergence of age- and HIV-related complications in these individuals presents a challenge for both patients and clinicians alike. New findings continue to emerge, as numerous researchers evaluate the combined impact of these two factors on quality of life, physiological systems, and mental health in PWH. Since its first occurrence in 2009, the International Workshop on HIV and Aging has served as a multidisciplinary meeting to share basic biomedical data, clinical trial results, treatment strategies, and epidemiological recommendations, toward better understanding and outcomes among like-minded scientific professionals. In this article, we share a selection of key findings presented in plenary talks at the 11th Annual International Workshop on HIV and Aging, held virtually from September 30, 2020 to October 2, 2020. We will also address the future directions of HIV and aging research, to further assess how the aging process intersects with chronic HIV.
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Affiliation(s)
| | - Ankita Garg
- Department of Infectious Diseases, University of Georgia, Athens, Georgia, USA
| | - Upal Roy
- Department of Health and Biomedical Sciences, The University of Texas Rio Grande Valley, Brownsville, Texas, USA
| | - Avery Matthews
- Department of Psychiatry, South Texas Veteran Health Care System, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - Jose Castillo-Mancilla
- Department of Medicine, Division of Infectious Disease, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Jordan E. Lake
- Department of Internal Medicine, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Giada Sebastiani
- Department of Medicine, McGill University Health Centre, Montreal, Canada
| | - Michael Yin
- Department of Infectious Disease, Columbia University, New York, New York, USA
| | - Todd T. Brown
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Angela R. Kamer
- Department of Periodontology and Implant Dentistry, New York University College of Dentistry, New York, New York, USA
| | - Douglas A. Jabs
- Department of Epidemiology, The Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA
- Department of Ophthalmology, The Wilmer Eye Institute, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ronald J. Ellis
- Department of Neurosciences, University of California San Diego, La Jolla, California, USA
- Department of Psychiatry, University of California San Diego, La Jolla, California, USA
| | - Marta Boffito
- Department of HIV Services, Chelsea and Westminster Hospital, London, United Kingdom
| | - Meredith Greene
- Division of Geriatrics, Department of Medicine, University of California San Francisco, San Francisco, California, USA
| | - Sarah Schmalzle
- Department of Infectious Disease, University of Maryland, Baltimore, Maryland, USA
| | - Eugenia Siegler
- Division of Geriatrics and Palliative Medicine, Weill Cornell Medicine, New York, New York, USA
| | - Kristine M. Erlandson
- Department of Medicine, Division of Infectious Disease, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - David J. Moore
- Department of Psychiatry, University of California San Diego, La Jolla, California, USA
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10
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Xu F, Aboseria E, Janal MN, Pushalkar S, Bederoff MV, Vasconcelos R, Sapru S, Paul B, Queiroz E, Makwana S, Solarewicz J, Guo Y, Aguallo D, Gomez C, Shelly D, Aphinyanaphongs Y, Gordon T, Corby PM, Kamer AR, Li X, Saxena D. Comparative Effects of E-Cigarette Aerosol on Periodontium of Periodontitis Patients. Front Oral Health 2021; 2:729144. [PMID: 35048050 PMCID: PMC8757783 DOI: 10.3389/froh.2021.729144] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/12/2021] [Indexed: 11/17/2022] Open
Abstract
Introduction: Tobacco use is one of the main causes of periodontitis. E-cigarette are gaining in popularity, and studies are needed to better understand the impact of e-cigarettes on oral health. Objective: To perform a longitudinal study to evaluate the adverse effects of e-cigarettes on periodontal health. Methods: Naïve E-cigarette users, cigarette smokers, and non-smokers were recruited using newspaper and social media. Age, gender, and ethnicity, were recorded. Participants were scheduled for two visits 6 months apart. At each visit, we collected data on the frequency and magnitude of e-cigarette and cigarette use, and alcohol consumption. Carbon monoxide (CO) levels, cotinine levels, salivary flow rate, periodontal probing depth (PD), bleeding on probing (BoP), and clinical attachment loss (CAL) were also determined at both baseline and follow-up visits and compared between groups with two-way repeated measures ANOVA. Periodontal diagnosis and other categorical variables were compared between groups with the chi-square statistic and logistic regression. Results: We screened 159 subjects and recruited 119 subjects. One-hundred-one subjects (31 cigarette smokers, 32 e-cigarette smokers, and 38 non-smokers) completed every assessment in both visits. The retention and compliance rate of subjects was 84.9%. The use of social media and craigslist was significant in recruiting e-cigarette subjects. Ethnicity and race differed between groups, as did average age in the male subjects. Carbon monoxide and salivary cotinine levels were highest among cigarette smokers. Bleeding on probing and average PDs similarly increased over time in all three groups, but CAL uniquely increased in e-cigarette smokers. Rates of severe periodontal disease were higher in cigarette smokers and e-cigarette users than non-smokers, but interpretation is confounded by the older age of the cigarette smokers. Conclusion: Among the recruited participants, CAL after 6 months was significantly worse only in the e-cigarette smokers. This study design and protocol will assist in future larger studies on e-cigarette and oral health.
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Affiliation(s)
- Fangxi Xu
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Eman Aboseria
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Malvin N. Janal
- Department of Epidemiology and Health Promotion, New York University College of Dentistry, New York, NY, United States
| | - Smruti Pushalkar
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Maria V. Bederoff
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Rebeca Vasconcelos
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Sakshi Sapru
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Bidisha Paul
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Erica Queiroz
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Shreya Makwana
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Julia Solarewicz
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Yuqi Guo
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Deanna Aguallo
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Claudia Gomez
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Donna Shelly
- Department of Medicine, New York University School of Medicine, New York, NY, United States
| | - Yindalon Aphinyanaphongs
- Department of Medicine, New York University School of Medicine, New York, NY, United States
- Department of Population Health, New York University School of Medicine, New York, NY, United States
| | - Terry Gordon
- Department of Environmental Medicine, New York University School of Medicine, New York, NY, United States
| | - Patricia M. Corby
- Department of Oral Medicine, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Angela R. Kamer
- Department of Periodontology and Implant Dentistry, New York University College of Dentistry, New York, NY, United States
| | - Xin Li
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
| | - Deepak Saxena
- Department of Molecular Pathobiology, New York University College of Dentistry, New York, NY, United States
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11
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Hendrix JA, Amon A, Abbeduto L, Agiovlasitis S, Alsaied T, Anderson HA, Bain LJ, Baumer N, Bhattacharyya A, Bogunovic D, Botteron KN, Capone G, Chandan P, Chase I, Chicoine B, Cieuta-Walti C, DeRuisseau LR, Durand S, Esbensen A, Fortea J, Giménez S, Granholm AC, Hahn LJ, Head E, Hillerstrom H, Jacola LM, Janicki MP, Jasien JM, Kamer AR, Kent RD, Khor B, Lawrence JB, Lemonnier C, Lewanda AF, Mobley W, Moore PE, Nelson LP, Oreskovic NM, Osorio RS, Patterson D, Rasmussen SA, Reeves RH, Roizen N, Santoro S, Sherman SL, Talib N, Tapia IE, Walsh KM, Warren SF, White AN, Wong GW, Yi JS. Opportunities, barriers, and recommendations in down syndrome research. Transl Sci Rare Dis 2021; 5:99-129. [PMID: 34268067 PMCID: PMC8279178 DOI: 10.3233/trd-200090] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Recent advances in medical care have increased life expectancy and improved the quality of life for people with Down syndrome (DS). These advances are the result of both pre-clinical and clinical research but much about DS is still poorly understood. In 2020, the NIH announced their plan to update their DS research plan and requested input from the scientific and advocacy community. OBJECTIVE The National Down Syndrome Society (NDSS) and the LuMind IDSC Foundation worked together with scientific and medical experts to develop recommendations for the NIH research plan. METHODS NDSS and LuMind IDSC assembled over 50 experts across multiple disciplines and organized them in eleven working groups focused on specific issues for people with DS. RESULTS This review article summarizes the research gaps and recommendations that have the potential to improve the health and quality of life for people with DS within the next decade. CONCLUSIONS This review highlights many of the scientific gaps that exist in DS research. Based on these gaps, a multidisciplinary group of DS experts has made recommendations to advance DS research. This paper may also aid policymakers and the DS community to build a comprehensive national DS research strategy.
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Affiliation(s)
| | - Angelika Amon
- Deceased. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA; Howard Hughes Medical Institute, Chevy Chase, MD, USA
| | - Leonard Abbeduto
- Department of Psychiatry and Behavioral Sciences, University of California, Davis, CA, USA; MIND Institute, University of California, Davis, CA, USA
| | | | - Tarek Alsaied
- Heart Institute Department of Pediatrics Cincinnati Children’s Hospital Medical Center University of Cincinnati, Cincinnati, OH, USA
| | | | | | - Nicole Baumer
- Department of Neurology, Boston Children’s Hospital, Harvard Medical School, Boston, MA, USA; Down Syndrome Program, Developmental Medicine Center, Boston Children’s Hospital, Boston, MA, USA
| | - Anita Bhattacharyya
- Waisman Center, University of Wisconsin-Madison, Madison, WI, USA
- Department of Cell and Regenerative Biology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA
| | - Dusan Bogunovic
- Department of Microbiology, Icahn School of Medicine at Mt. Sinai, New York, NY, USA; Department of Pediatrics, Icahn School of Medicine at Mt. Sinai, New York, NY; Precision Immunology Institute, Icahn School of Medicine at Mt. Sinai, New York, NY, USA; Mindich Child Health and Development Institute, Icahn School of Medicine at Mt. Sinai, New York, NY, USA
| | - Kelly N. Botteron
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA; Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO, USA
| | | | - Priya Chandan
- Department of Neurosurgery, Division of Physical Medicine and Rehabilitation, University of Louisville School of Medicine, Louisville, KY, USA
| | - Isabelle Chase
- Department of Pediatric Dentistry, Boston Children’s Hospital, Boston, MA, USA
| | - Brian Chicoine
- Advocate Medical Group Adult Down Syndrome Center, Park Ridge, IL, USA
| | | | | | | | - Anna Esbensen
- Department of Pediatrics, University of Cincinnati College of Medicine & Division of Developmental and Behavioral Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
| | - Juan Fortea
- Barcelona Down Medical Center, Fundació Catalana de Síndrome de Down, Barcelona, Spain; Sant Pau Memory Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain; Center of Biomedical Investigation Network for Neurodegenerative Diseases, Madrid, Spain
| | - Sandra Giménez
- Multidisciplinary Sleep Unit, Respiratory Department, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Ann-Charlotte Granholm
- Knoebel Institute for Healthy Aging, University of Denver, Denver, CO, USA
- Department of Neurobiology, Care Sciences and Society (NVS), Karolinska Institutet, Stockholm, Sweden
| | - Laura J. Hahn
- Department of Speech and Hearing Science, University of Illinois Urbana Champaign, Champaign, IL, USA
| | - Elizabeth Head
- Department of Pathology and Laboratory Medicine, UC Irvine School of Medicine, Orange, CA, USA
| | | | - Lisa M. Jacola
- Department of Psychology, St Jude Children’s Research Hospital, Memphis, TN, USA
| | | | - Joan M. Jasien
- Division of Pediatric Neurology, Duke University Health System, Durham, NC, USA
| | - Angela R. Kamer
- Department of Periodontology and Implant Dentistry, New York University, College of Dentistry, New York, NY, USA
| | - Raymond D. Kent
- Waisman Center, University of Wisconsin-Madison, Madison, WI, USA
| | - Bernard Khor
- Benaroy Research Institute at Virginia Mason, Seattle, WA, USA
| | - Jeanne B. Lawrence
- Department of Neurology, University of Massachusetts Medical School, Worcester, MA, USA; Department of Pediatrics, University of Massachusetts Medical School, Worcester, MA, USA
| | | | - Amy Feldman Lewanda
- Children s National Rare Disease Institute, Children’s National Health System, Washington, DC., USA
| | - William Mobley
- Department of Neurosciences, University of California, San Diego, CA, USA
| | - Paul E. Moore
- Division of Allergy, Immunology, and Pulmonology, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN, USA
| | | | - Nicolas M. Oreskovic
- Department of Pediatrics, Massachusetts General Hospital, Boston, MA, USA; Department of Internal Medicine, Massachusetts General Hospital, Boston, Mass
- Department of Pediatrics, Harvard Medical School, Boston, MA, USA
| | - Ricardo S. Osorio
- Center for Brain Health, Department of Psychiatry, NYU Langone Medical Center, New York, NY, USA
| | - David Patterson
- Knoebel Institute for Healthy Aging, University of Denver, Denver, CO, USA
- Eleanor Roosevelt Institute, University of Denver, Denver, CO, USA; Department of Biological Sciences, University of Denver, Denver, CO, USA; Molecular and Cellular Biophysics Program, University of Denver, Denver, CO, USA
| | - Sonja A. Rasmussen
- Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL; Department of Epidemiology, University of Florida College of Public Health and Health Professions and College of Medicine, Gainesville, FL
| | - Roger H. Reeves
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA; McKusick-Nathans Department of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Nancy Roizen
- Department of Pediatrics, UH/Rainbow Babies and Children’s Hospital and Department of Pediatrics, Case Western Reserve University, Cleveland, OH, USA
| | - Stephanie Santoro
- Department of Pediatrics, Harvard Medical School, Boston, MA, USA
- Down Syndrome Program, Division of Medical Genetics and Metabolism, Department of Pediatrics, Massachusetts General Hospital, Boston, MA, USA
| | - Stephanie L. Sherman
- Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, USA
| | - Nasreen Talib
- Division of General Pediatrics, Children’s Mercy Kansas City, 2401 Gillham Road, Kansas City, MO, USA
| | - Ignacio E. Tapia
- Sleep Center, Division of Pulmonary Medicine, Children’s Hospital of Philadelphia, Philadelphia, PA, USA
| | - Kyle M. Walsh
- Division of Neuro-epidemiology, Department of Neurosurgery, Duke University, Durham, NC, USA
| | - Steven F. Warren
- Institute for Life Span Studies, University of Kansas, Lawrence, KS, USA
| | - A. Nicole White
- Research Foundation, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
| | - Guang William Wong
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD, USA; McKusick-Nathans Department of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Center for Metabolism and Obesity Research, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - John S. Yi
- Division of Surgical Sciences, Department of Surgery, Duke University Medical Center, Durham, NC, USA
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12
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Kamer AR, Pushalkar S, Gulivindala D, Butler T, Li Y, Annam KRC, Glodzik L, Ballman KV, Corby PM, Blennow K, Zetterberg H, Saxena D, de Leon MJ. Periodontal dysbiosis associates with reduced CSF Aβ42 in cognitively normal elderly. Alzheimers Dement (Amst) 2021; 13:e12172. [PMID: 33869725 PMCID: PMC8040436 DOI: 10.1002/dad2.12172] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/07/2021] [Accepted: 02/08/2021] [Indexed: 12/30/2022]
Abstract
INTRODUCTION Periodontal disease is a chronic, inflammatory bacterial dysbiosis that is associated with both Alzheimer's disease (AD) and Down syndrome. METHODS A total of 48 elderly cognitively normal subjects were evaluated for differences in subgingival periodontal bacteria (assayed by 16S rRNA sequencing) between cerebrospinal fluid (CSF) biomarker groups of amyloid and neurofibrillary pathology. A dysbiotic index (DI) was defined at the genus level as the abundance ratio of known periodontal bacteria to healthy bacteria. Analysis of variance/analysis of covariance (ANOVA/ANCOVA), linear discriminant effect-size analyses (LEfSe) were used to determine the bacterial genera and species differences between the CSF biomarker groups. RESULTS At genera and species levels, higher subgingival periodontal dysbiosis was associated with reduced CSF amyloid beta (Aβ)42 (P = 0.02 and 0.01) but not with P-tau. DISCUSSION We show a selective relationship between periodontal disease bacterial dysbiosis and CSF biomarkers of amyloidosis, but not for tau. Further modeling is needed to establish the direct link between oral bacteria and Aβ.
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Affiliation(s)
- Angela R. Kamer
- Department of Periodontology and Implant DentistryCollege of DentistryNew York UniversityNew YorkUSA
| | - Smruti Pushalkar
- Department of Molecular PathobiologyCollege of DentistryNew York UniversityNew YorkUSA
| | - Deepthi Gulivindala
- Department of Periodontology and Implant DentistryCollege of DentistryNew York UniversityNew YorkUSA
| | - Tracy Butler
- Department of RadiologyWeill Medical CenterBrain Health Imaging Institute Cornell UniversityNew YorkUSA
| | - Yi Li
- Department of RadiologyWeill Medical CenterBrain Health Imaging Institute Cornell UniversityNew YorkUSA
| | | | - Lidia Glodzik
- Department of RadiologyWeill Medical CenterBrain Health Imaging Institute Cornell UniversityNew YorkUSA
| | - Karla V. Ballman
- Division of BiostatisticsDepartment of Population Health SciencesWeill Medical CenterWeill Cornell MedicineNew YorkUSA
| | - Patricia M. Corby
- Department of Oral MedicineSchool of Dental MedicineUniversity of PennsylvaniaPhiladelphiaPennsylvaniaUSA
| | - Kaj Blennow
- Department of Psychiatry and NeurochemistryInstitute of Neuroscience and Physiologythe Sahlgrenska Academy at the University of GothenburgMölndalSweden
- Clinical Neurochemistry LaboratorySahlgrenska University HospitalMölndalSweden
| | - Henrik Zetterberg
- Department of Psychiatry and NeurochemistryInstitute of Neuroscience and Physiologythe Sahlgrenska Academy at the University of GothenburgMölndalSweden
- Clinical Neurochemistry LaboratorySahlgrenska University HospitalMölndalSweden
- Department of Neurodegenerative DiseaseUCL Institute of NeurologyLondonUK
- UK Dementia Research Institute at UCLLondonUK
| | - Deepak Saxena
- Department of Molecular PathobiologyCollege of DentistryNew York UniversityNew YorkUSA
| | - Mony J. de Leon
- Department of RadiologyWeill Medical CenterBrain Health Imaging Institute Cornell UniversityNew YorkUSA
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13
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Hategan SI, Kamer SA, Craig RG, Sinescu C, de Leon MJ, Jianu DC, Marian C, Bora BI, Dan TF, Birdac CD, Marcu A, Kamer AR, Negrutiu ML. Cognitive dysfunction in young subjects with periodontal disease. Neurol Sci 2021; 42:4511-4519. [PMID: 33606127 PMCID: PMC8519837 DOI: 10.1007/s10072-021-05115-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 02/02/2021] [Indexed: 11/05/2022]
Abstract
Background Periodontal disease is an inflammatory, dysbiotic condition. Studies have shown that in the elderly, periodontal disease was associated with cognitive dysfunction and Alzheimer’s disease. Objective To investigate whether young healthy subjects with periodontal disease have lower cognition compared to those without periodontal disease. The salivary cytokines (IL-1β, TNF-α) levels in relation to cognition were also tested. Methods In a monocenter, cross-sectional study, forty subjects [mean age (SD) = 34 (5) and 48% female] from western Romania were classified into periodontal disease conditions using radiographic assessment: 10 subjects had aggressive periodontitis (AGG_P), 20 chronic mild-moderate periodontitis (CR_P), and 10 no periodontitis (NL_P). Neuropsychological assessment performed by standardized neurologists and psychologist included Rey Auditory Verbal Learning Test (RAVLT), Montreal Cognitive Assessment test (MOCA), Mini-Mental State Examination (MMSE), and Prague tests. Salivary cytokines levels were determined by ELISA. Results RAVLT and MOCA delayed recall scores were lower in AGG_P group compared to NL_P and CR_P. The learning curve was also different with subjects with AGG_P showing reduced learning performance. Contrary to our hypothesis, salivary IL-1β associated with immediate but not delayed cognitive scores. Conclusions These results showed for the first time that subjects with AGG_P had cognitive dysfunction and IL-1β may play a role in this process. Supplementary Information The online version contains supplementary material available at 10.1007/s10072-021-05115-3.
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Affiliation(s)
- Simona I Hategan
- Department of Prosthodontics, Faculty of Dentistry, University of Medicine and Pharmacy "Victor Babes" Timisoara, Bd. Revolutiei 1989, Nr.9, 300070, Timisoara, Romania
| | - Sabrina A Kamer
- Department of Biochemistry and Pharmacology, University of Medicine and Pharmacy "Victor Babes" Timisoara, Piata Eftimie Murgu, Nr 2, 300041, Timişoara, Romania
| | - Ronald G Craig
- Department of Molecular Pathobiology, College of Dentistry, New York University, 345 East 24th Street, New York, NY, 10010, USA
| | - Cosmin Sinescu
- Department of Prostheses Technology and Dental Materials, Faculty of Dentistry, University of Medicine and Pharmacy "Victor Babes" Timisoara, Bd. Revolutiei 1989, Nr.9, sc.C, et.IV, 300070, Timisoara, Romania
| | - Mony J de Leon
- Department of Radiology, Brain Health Imaging Institute, Weill Cornell Medicine, New York, NY, 10019, USA
| | - Dragos C Jianu
- Department of Neurology - Neurosciences, University of Medicine and Pharmacy "Victor Babes" Timisoara, Eftimie Murgu st., no.2, 300041, Timisoara, Romania.,The Centre for Cognitive Research in Neuropsychiatric Pathology (NeuroPsy-Cog), University of Medicine and Pharmacy "Victor Babes" Timisoara, Eftimie Murgu st.,no.2, 300041, Timisoara, Romania.,First Dept. of Neurology, Clinical County Emergency Hospital, Timisoara, Liviu Rebreanu Ave., no 156, 300723, Timisoara, Romania
| | - Catalin Marian
- Department of Biochemistry and Pharmacology, University of Medicine and Pharmacy "Victor Babes" Timisoara, Piata Eftimie Murgu, Nr 2, 300041, Timişoara, Romania
| | - Bianca I Bora
- The Centre for Cognitive Research in Neuropsychiatric Pathology (NeuroPsy-Cog), University of Medicine and Pharmacy "Victor Babes" Timisoara, Eftimie Murgu st.,no.2, 300041, Timisoara, Romania.,First Dept. of Neurology, Clinical County Emergency Hospital, Timisoara, Liviu Rebreanu Ave., no 156, 300723, Timisoara, Romania
| | - Traian-Flavius Dan
- Department of Neurology - Neurosciences, University of Medicine and Pharmacy "Victor Babes" Timisoara, Eftimie Murgu st., no.2, 300041, Timisoara, Romania.,The Centre for Cognitive Research in Neuropsychiatric Pathology (NeuroPsy-Cog), University of Medicine and Pharmacy "Victor Babes" Timisoara, Eftimie Murgu st.,no.2, 300041, Timisoara, Romania.,First Dept. of Neurology, Clinical County Emergency Hospital, Timisoara, Liviu Rebreanu Ave., no 156, 300723, Timisoara, Romania
| | - Claudiu D Birdac
- First Dept. of Neurology, Clinical County Emergency Hospital, Timisoara, Liviu Rebreanu Ave., no 156, 300723, Timisoara, Romania
| | - Anca Marcu
- The Centre for Cognitive Research in Neuropsychiatric Pathology (NeuroPsy-Cog), University of Medicine and Pharmacy "Victor Babes" Timisoara, Eftimie Murgu st.,no.2, 300041, Timisoara, Romania
| | - Angela R Kamer
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, 345 East 24th Street, New York, NY, 10010, USA.
| | - Meda Lavinia Negrutiu
- Department of Prostheses Technology and Dental Materials, Faculty of Dentistry, University of Medicine and Pharmacy "Victor Babes" Timisoara, Bd. Revolutiei 1989, Nr.9, sc.C, et.IV, 300070, Timisoara, Romania
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14
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Sierra MA, Li Q, Pushalkar S, Paul B, Sandoval TA, Kamer AR, Corby P, Guo Y, Ruff RR, Alekseyenko AV, Li X, Saxena D. The Influences of Bioinformatics Tools and Reference Databases in Analyzing the Human Oral Microbial Community. Genes (Basel) 2020; 11:genes11080878. [PMID: 32756341 PMCID: PMC7465726 DOI: 10.3390/genes11080878] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 07/11/2020] [Accepted: 07/29/2020] [Indexed: 12/20/2022] Open
Abstract
There is currently no criterion to select appropriate bioinformatics tools and reference databases for analysis of 16S rRNA amplicon data in the human oral microbiome. Our study aims to determine the influence of multiple tools and reference databases on α-diversity measurements and β-diversity comparisons analyzing the human oral microbiome. We compared the results of taxonomical classification by Greengenes, the Human Oral Microbiome Database (HOMD), National Center for Biotechnology Information (NCBI) 16S, SILVA, and the Ribosomal Database Project (RDP) using Quantitative Insights Into Microbial Ecology (QIIME) and the Divisive Amplicon Denoising Algorithm (DADA2). There were 15 phyla present in all of the analyses, four phyla exclusive to certain databases, and different numbers of genera were identified in each database. Common genera found in the oral microbiome, such as Veillonella, Rothia, and Prevotella, are annotated by all databases; however, less common genera, such as Bulleidia and Paludibacter, are only annotated by large databases, such as Greengenes. Our results indicate that using different reference databases in 16S rRNA amplicon data analysis could lead to different taxonomic compositions, especially at genus level. There are a variety of databases available, but there are no defined criteria for data curation and validation of annotations, which can affect the accuracy and reproducibility of results, making it difficult to compare data across studies.
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Affiliation(s)
- Maria A. Sierra
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
| | - Qianhao Li
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
| | - Smruti Pushalkar
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
| | - Bidisha Paul
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
| | - Tito A. Sandoval
- Department of Obstetrics and Gynecology, Weill Cornell Medicine, New York, NY 10065, USA;
| | - Angela R. Kamer
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
| | - Patricia Corby
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
| | - Yuqi Guo
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
| | - Ryan Richard Ruff
- Department of Epidemiology & Health Promotion, New York University College of Dentistry, New York, NY 10010, USA;
| | - Alexander V. Alekseyenko
- The Biomedical Informatics Center, Program for Human Microbiome Research, Department of Public Health Sciences, Department of Oral Health Sciences, Department of Healthcare Leadership and Management, Medical University of South Carolina, Charleston, SC 29425, USA;
| | - Xin Li
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
| | - Deepak Saxena
- Department of Basic Science, New York University College of Dentistry, New York, NY 10010, USA; (M.A.S.); (Q.L.); (S.P.); (B.P.); (A.R.K.); (P.C.); (Y.G.); (X.L.)
- S. Arthur Localio Laboratory, Departments of Surgery New York University School of Medicine, New York, NY 10016, USA
- Correspondence: ; Tel.: +1-212-9989256
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15
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Kamer AR, Craig RG, Niederman R, Fortea J, de Leon MJ. Periodontal disease as a possible cause for Alzheimer's disease. Periodontol 2000 2020; 83:242-271. [PMID: 32385876 DOI: 10.1111/prd.12327] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 06/23/2019] [Indexed: 12/13/2022]
Abstract
Approximately 47 million people worldwide have been diagnosed with dementia, 60%-80% of whom have dementia of the Alzheimer's disease type. Unfortunately, there is no cure in sight. Defining modifiable risk factors for Alzheimer's disease may have a significant impact on its prevalence. An increasing body of evidence suggests that chronic inflammation and microbial dysbiosis are risk factors for Alzheimer's disease. Periodontal disease is a chronic inflammatory disease that develops in response to response to microbial dysbiosis. Many studies have shown an association between periodontal disease and Alzheimer's disease. The intent of this paper was to review the existing literature and determine, using the Bradford Hill criteria, whether periodontal disease is causally related to Alzheimer's disease.
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Affiliation(s)
- Angela R Kamer
- Department of Periodontology and Implant Dentistry, New York University, College of Dentistry, New York, New York, USA
| | - Ronald G Craig
- Department of Periodontology and Implant Dentistry, New York University, College of Dentistry, New York, New York, USA.,Department of Basic Sciences and Craniofacial Biology, New York University, College of Dentistry, New York, New York, USA
| | - Richard Niederman
- Department of Epidemiology and Health Promotion, New York University, College of Dentistry, New York, New York, USA
| | - Juan Fortea
- Alzheimer Down Unit, Department of Neurology, Hospital de la Santa Creu i Sant Pau- Biomedical Research Institute Sant Pau- Universitat Autònoma de Barcelona and Barcelona Down Medical Center, Fundació Catalana Síndrome de Down, Barcelona, Spain.,Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clínic, Barcelona, Spain
| | - Mony J de Leon
- Department of Radiology, Brain Health Imaging Institute, Weill Cornell Medicine, New York, New York, USA
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16
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Itzhaki RF, Lathe R, Balin BJ, Ball MJ, Bearer EL, Braak H, Bullido MJ, Carter C, Clerici M, Cosby SL, Del Tredici K, Field H, Fulop T, Grassi C, Griffin WST, Haas J, Hudson AP, Kamer AR, Kell DB, Licastro F, Letenneur L, Lövheim H, Mancuso R, Miklossy J, Otth C, Palamara AT, Perry G, Preston C, Pretorius E, Strandberg T, Tabet N, Taylor-Robinson SD, Whittum-Hudson JA. Microbes and Alzheimer's Disease. J Alzheimers Dis 2016; 51:979-84. [PMID: 26967229 DOI: 10.3233/jad-160152] [Citation(s) in RCA: 354] [Impact Index Per Article: 44.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ruth F Itzhaki
- Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester, UK
| | - Richard Lathe
- Division of Infection and Pathway Medicine, University of Edinburgh, Little France, Edinburgh, UK
| | - Brian J Balin
- Center for Chronic Disorders of Aging, Philadelphia College of Osteopathic Medicine, Philadelphia, USA
| | - Melvyn J Ball
- Department of Pathology (Neuropathology), Oregon Health and Science University, Portland, OR, USA
| | - Elaine L Bearer
- Department of Pathology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Heiko Braak
- Clinical Neuroanatomy Section, Department of Neurology, Center for Biomedical Research, University of Ulm, Ulm, Germany
| | - Maria J Bullido
- Centro de Biologia Molecular 'Severo Ochoa' (CSIC-UAM), Universidad Autonoma de Madrid, and Centro de Investigacion en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
| | | | - Mario Clerici
- University of Milano and IRCCS SM Nascente, Don C Gnocchi Foundation, Milan, Italy
| | - S Louise Cosby
- Centre for Infection and Immunity, Medical Biology Centre, Queen's University, Belfast, UK
| | - Kelly Del Tredici
- Clinical Neuroanatomy Section, Department of Neurology, Center for Biomedical Research, University of Ulm, Ulm, Germany
| | | | - Tamas Fulop
- Department of Medicine, Division of Geriatrics, Université de Sherbrooke, Sherbrooke, PQ, Canada
| | - Claudio Grassi
- Institute of Human Physiology, Medical School, Universitá Cattolica, Rome; San Raffaele Pisana Scientific Institute for Research, Hospitalization, and Health Care, Rome, Italy
| | - W Sue T Griffin
- Department of Geriatrics, University of Arkansas for Medical Sciences, and Geriatric Research, Education, and Clinical Center, Little Rock, AR, USA
| | - Jürgen Haas
- Division of Infection and Pathway Medicine, University of Edinburgh, Little France, Edinburgh, UK
| | - Alan P Hudson
- Department of Immunology and Microbiology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Angela R Kamer
- NYU College of Dentistry, Department of Periodontology and Implant Dentistry, New York, NY, USA
| | - Douglas B Kell
- School of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester, UK
| | - Federico Licastro
- Department of Experimental, Diagnostic, and Specialty Medicine, School of Medicine, University of Bologna, Bologna, Italy
| | | | - Hugo Lövheim
- Department of Community Medicine and Rehabilitation, Geriatric Medicine, Umeå University, Umeå, Sweden
| | | | - Judith Miklossy
- Prevention Alzheimer International Foundation, International Alzheimer Research Center, Martigny-Croix, Switzerland
| | - Carola Otth
- Institute of Clinical Microbiology, Faculty of Medicine, Austral University of Chile, Valdivia, Chile
| | - Anna Teresa Palamara
- Department of Public Health and Infectious Diseases, Institute Pasteur Cenci Bolognetti Foundation, Sapienza University of Rome; San Raffaele Pisana Scientific Institute for Research, Hospitalization, and Health Care, Rome, Italy
| | - George Perry
- College of Sciences, University of Texas at San Antonio, San Antonio, TX, USA
| | | | - Etheresia Pretorius
- Applied Morphology Research Centre, Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia, South Africa
| | - Timo Strandberg
- Helsinki University Hospital and University of Helsinki; University of Oulu, Centre of Life Course Health Research, Oulu, Finland
| | - Naji Tabet
- Division of Old Age Psychiatry, Brighton and Sussex Medical School, Brighton, UK
| | | | - Judith A Whittum-Hudson
- Departments of Immunology and Microbiology, Internal Medicine (Rheumatology), and Ophthalmology, Wayne State University School of Medicine, Detroit, MI, USA
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17
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Kamer AR, Fortea JO, Videla S, Mayoral A, Janal M, Carmona-Iragui M, Benejam B, Craig RG, Saxena D, Corby P, Glodzik L, Annam KRC, Robbins M, de Leon MJ. Periodontal disease's contribution to Alzheimer's disease progression in Down syndrome. Alzheimers Dement (Amst) 2016; 2:49-57. [PMID: 27239536 PMCID: PMC4879643 DOI: 10.1016/j.dadm.2016.01.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
People with Down syndrome (DS) are at an increased risk for Alzheimer's disease (AD). After 60 years of age, >50% of DS subjects acquire dementia. Nevertheless, the age of onset is highly variable possibly because of both genetic and environmental factors. Genetics cannot be modified, but environmental risk factors present a potentially relevant intervention for DS persons at risk for AD. Among them, inflammation, important in AD of DS type, is potential target. Consistent with this hypothesis, chronic peripheral inflammation and infections may contribute to AD pathogenesis in DS. People with DS have an aggressive form of periodontitis characterized by rapid progression, significant bacterial and inflammatory burden, and an onset as early as 6 years of age. This review offers a hypothetical mechanistic link between periodontitis and AD in the DS population. Because periodontitis is a treatable condition, it may be a readily modifiable risk factor for AD.
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Affiliation(s)
- Angela R Kamer
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA; Department of Psychiatry, Center for Brain Health, School of Medicine, New York, NY, USA
| | - Juan O Fortea
- Department of Neurology, Hospital de la Santa Creu i Sant Pau, Universitat Autónoma de Barcelona, Barcelona, Spain; Down Medical Center, Fundació Catalana Síndrome de Down, Barcelona, Spain
| | - Sebastià Videla
- Down Medical Center, Fundació Catalana Síndrome de Down, Barcelona, Spain
| | - Angela Mayoral
- Down Medical Center, Fundació Catalana Síndrome de Down, Barcelona, Spain; Dentistry School Universitat Internacional de Catalunya, Sant Cugat del Vallés, Barcelona, Spain
| | - Malvin Janal
- Department of Epidemiology, College of Dentistry, New York University, New York, NY, USA
| | - Maria Carmona-Iragui
- Department of Neurology, Hospital de la Santa Creu i Sant Pau, Universitat Autónoma de Barcelona, Barcelona, Spain; Down Medical Center, Fundació Catalana Síndrome de Down, Barcelona, Spain
| | - Bessy Benejam
- Down Medical Center, Fundació Catalana Síndrome de Down, Barcelona, Spain
| | - Ronald G Craig
- Department of Basic Sciences and Craniofacial Biology, College of Dentistry, New York University, New York, NY, USA
| | - Deepak Saxena
- Department of Basic Sciences and Craniofacial Biology, College of Dentistry, New York University, New York, NY, USA
| | - Patricia Corby
- Department of Psychiatry, Center for Brain Health, School of Medicine, New York, NY, USA
| | - Lidia Glodzik
- Department of Psychiatry, Center for Brain Health, School of Medicine, New York, NY, USA
| | - Kumar Raghava Chowdary Annam
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA
| | - Miriam Robbins
- Department of Dental Medicine, Winthrop University Hospital, Mineola, NY, USA
| | - Mony J de Leon
- Department of Psychiatry, Center for Brain Health, School of Medicine, New York, NY, USA
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18
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Kamer AR, Janal MN, de Leon M. Letter to the editor regarding: Summary of the evidence on modifiable risk factors for cognitive decline and dementia: A population-based perspective. Alzheimers Dement (Amst) 2015; 1:385-6. [PMID: 27239519 PMCID: PMC4879485 DOI: 10.1016/j.dadm.2015.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Angela R Kamer
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA
| | - Malvin N Janal
- Department of Epidemiology and Health Promotion, College of Dentistry, New York University, New York, NY, USA
| | - Mony de Leon
- Department of Psychiatry, Center for Brain Health, New York University School of Medicine, New York, NY, USA
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19
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Kamer AR, Pirraglia E, Li Y, Tsui W, McHugh P, Svetcov S, Linker R, Annam K, Osorio R, Glodzik L, Corby PM, Janal M, Zetterberg H, Blennow K, DeLeon M. P4‐036: CSF Alzheimer's disease‐related biomarkers are higher in subjects with periodontal disease. Alzheimers Dement 2015. [DOI: 10.1016/j.jalz.2015.06.1740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | | | - Yi Li
- New York UniversityNew YorkNYUSA
| | - Wai Tsui
- New York UniversityNew YorkNYUSA
| | | | | | | | | | | | | | | | | | - Henrik Zetterberg
- Clinical Neurochemistry Laboratory, Institute of Neuroscience and PhysiologyThe Sahlgrenska Academy at the University of GothenburgMölndalSweden
| | - Kaj Blennow
- Clinical Neurochemistry Laboratory, Institute of Neuroscience and PhysiologyThe Sahlgrenska Academy at the University of GothenburgMölndalSweden
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20
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Kamer AR, Pirraglia E, Tsui W, Rusinek H, Vallabhajosula S, Mosconi L, Yi L, McHugh P, Craig RG, Svetcov S, Linker R, Shi C, Glodzik L, Williams S, Corby P, Saxena D, de Leon MJ. Periodontal disease associates with higher brain amyloid load in normal elderly. Neurobiol Aging 2015; 36:627-33. [PMID: 25491073 PMCID: PMC4399973 DOI: 10.1016/j.neurobiolaging.2014.10.038] [Citation(s) in RCA: 170] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 10/26/2014] [Accepted: 10/30/2014] [Indexed: 02/04/2023]
Abstract
The accumulation of amyloid-β (Aβ) plaques is a central feature of Alzheimer's disease (AD). First reported in animal models, it remains uncertain if peripheral inflammatory and/or infectious conditions in humans can promote Aβ brain accumulation. Periodontal disease, a common chronic infection, has been previously reported to be associated with AD. Thirty-eight cognitively normal, healthy, and community-residing elderly (mean age, 61 and 68% female) were examined in an Alzheimer's Disease Research Center and a University-Based Dental School. Linear regression models (adjusted for age, apolipoprotein E, and smoking) were used to test the hypothesis that periodontal disease assessed by clinical attachment loss was associated with brain Aβ load using (11)C-Pittsburgh compound B (PIB) positron emission tomography imaging. After adjusting for confounders, clinical attachment loss (≥3 mm), representing a history of periodontal inflammatory/infectious burden, was associated with increased PIB uptake in Aβ vulnerable brain regions (p = 0.002). We show for the first time in humans an association between periodontal disease and brain Aβ load. These data are consistent with the previous animal studies showing that peripheral inflammation/infections are sufficient to produce brain Aβ accumulations.
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Affiliation(s)
- Angela R Kamer
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA; School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA.
| | - Elizabeth Pirraglia
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA
| | - Wai Tsui
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA
| | - Henry Rusinek
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA; School of Medicine, Department of Radiology, New York, NY, USA
| | | | - Lisa Mosconi
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA
| | - Li Yi
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA
| | - Pauline McHugh
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA
| | - Ronald G Craig
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA; Department of Basic Sciences and Craniofacial Biology, College of Dentistry, New York University, New York, NY, USA
| | - Spencer Svetcov
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA
| | - Ross Linker
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA
| | - Chen Shi
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA
| | - Lidia Glodzik
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA
| | - Schantel Williams
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA
| | - Patricia Corby
- Department of Periodontology and Implant Dentistry, College of Dentistry, New York University, New York, NY, USA; College of Dentistry, Bluestone Center for Clinical Research, New York University, New York, NY, USA
| | - Deepak Saxena
- Department of Basic Sciences and Craniofacial Biology, College of Dentistry, New York University, New York, NY, USA
| | - Mony J de Leon
- School of Medicine, Department of Psychiatry, Center for Brain Health, New York, NY, USA
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21
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Kamer AR, Morse DE, Holm-Pedersen P, Mortensen EL, Avlund K. Periodontal Inflammation in Relation to Cognitive Function in an Older Adult Danish Population. ACTA ACUST UNITED AC 2012; 28:613-24. [DOI: 10.3233/jad-2011-102004] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Angela R. Kamer
- Department of Periodontology and Implant Dentistry, New York University College of Dentistry, New York, NY, USA
| | - Douglas E. Morse
- Department of Epidemiology and Health Promotion, New York University College of Dentistry, New York, NY, USA
| | - Poul Holm-Pedersen
- Copenhagen Gerontological Oral Health Research Center, School of Dentistry, University of Copenhagen, Copenhagen N, Denmark
| | - Erik L. Mortensen
- Department of Public Health and Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
| | - Kirsten Avlund
- Department of Public Health, University of Copenhagen, Danish Aging Research Centre, University of Aarhus, Odense and Copenhagen, Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
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Kamer AR, Craig RG, Pirraglia E, Dasanayake AP, Norman RG, Boylan RJ, Nehorayoff A, Glodzik L, Brys M, de Leon MJ. TNF-alpha and antibodies to periodontal bacteria discriminate between Alzheimer's disease patients and normal subjects. J Neuroimmunol 2009; 216:92-7. [PMID: 19767111 DOI: 10.1016/j.jneuroim.2009.08.013] [Citation(s) in RCA: 179] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2009] [Revised: 08/26/2009] [Accepted: 08/28/2009] [Indexed: 11/25/2022]
Abstract
The associations of inflammation/immune responses with clinical presentations of Alzheimer's disease (AD) remain unclear. We hypothesized that TNF-alpha and elevated antibodies to periodontal bacteria would be greater in AD compared to normal controls (NL) and their combination would aid clinical diagnosis of AD. Plasma TNF-alpha and antibodies against periodontal bacteria were elevated in AD patients compared with NL and independently associated with AD. The number of positive IgG to periodontal bacteria incremented the TNF-alpha classification of clinical AD and NL. This study shows that TNF-alpha and elevated numbers of antibodies against periodontal bacteria associate with AD and contribute to the AD diagnosis.
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Affiliation(s)
- Angela R Kamer
- New York University, College of Dentistry, Department of Periodontology and Implant Dentistry, New York, NY 10010, USA.
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Kamer AR, Dasanayake AP, Craig RG, Glodzik-Sobanska L, Bry M, de Leon MJ. Alzheimer's disease and peripheral infections: the possible contribution from periodontal infections, model and hypothesis. J Alzheimers Dis 2008; 13:437-49. [PMID: 18487851 DOI: 10.3233/jad-2008-13408] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Alzheimer's disease (AD) affects approximately 4.5 million people in the U.S. and this number will increase as the population ages and the life-span increases. Therefore, of paramount importance is identifying mechanisms and factors that affect the risk of developing AD. The etiology and pathogenic mechanisms for AD have not been defined, although inflammation within the brain is thought to play a role. Consistent with this hypothesis, studies suggest that peripheral infections contribute to the inflammatory state of the central nervous system. Periodontitis is a prevalent, persistent peripheral infection associated with gram negative, anaerobic bacteria that are capable of exhibiting localized and systemic infections in the host. This review offers a hypothetical link between periodontitis and AD and will present possible mechanistic links between periodontitis related inflammation and AD. It will review the pathogenesis of periodontitis and the mechanisms by which periodontal infections may affect the onset and progression of AD. Since periodontitis is a treatable condition, it may be a readily modifiable risk factor for AD.
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Affiliation(s)
- Angela R Kamer
- Department of Periodontics and Implant Dentistry and Basic Sciences, NYU College of Dentistry, New York, NY 10010, USA.
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25
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Kamer AR, Craig RG, Dasanayake AP, Brys M, Glodzik‐Sobanska L, Leon MJ. Inflammation and Alzheimer's disease: Possible role of periodontal diseases. Alzheimers Dement 2007; 4:242-50. [DOI: 10.1016/j.jalz.2007.08.004] [Citation(s) in RCA: 231] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2007] [Revised: 05/24/2007] [Accepted: 08/29/2007] [Indexed: 11/16/2022]
Affiliation(s)
- Angela R. Kamer
- Department of Periodontology and Implant DentistryCollege of DentistryNew York UniversityNew YorkNYUSA
| | - Ronald G. Craig
- Department of Periodontology and Implant DentistryCollege of DentistryNew York UniversityNew YorkNYUSA
- Department of Basic Sciences and Craniofacial BiologyCollege of DentistryNew York UniversityNew YorkNYUSA
| | - Ananda P. Dasanayake
- Department of Epidemiology and Health PromotionCollege of DentistryNew York UniversityNew YorkNYUSA
| | - Miroslaw Brys
- Department of PsychiatrySchool of MedicineNew York UniversityNew YorkNYUSA
| | | | - Mony J. Leon
- Department of PsychiatrySchool of MedicineNew York UniversityNew YorkNYUSA
- Nathan Kline InstituteOrangeburgNYUSA
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Elian N, Ehrlich B, Jalbout ZN, Classi AJ, Cho SC, Kamer AR, Froum S, Tarnow DP. Advanced concepts in implant dentistry: creating the "aesthetic site foundation". Dent Clin North Am 2007; 51:547-63, xi-xii. [PMID: 17532927 DOI: 10.1016/j.cden.2007.03.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
To obtain optimal and predictable aesthetics, deficiencies caused by soft and particularly hard tissue loss can be managed by various methods, such as orthodontic tooth eruption, socket preservation, and guided bone regeneration. However, in complex cases, these methods are often insufficient. Here, the authors introduce advanced concepts in aesthetic implant dentistry, such as "Aesthetic Site Foundation", "Aesthetic Guided Bone Regeneration" and "Implant Rectangle" that will guide the clinician in the quest to optimal aesthetic outcomes.
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Affiliation(s)
- Nicolas Elian
- Ashman Department of Periodontology and Implant Dentistry, New York University College of Dentistry, 345 East 24th Street, New York, NY 10010, USA
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27
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Craig RG, Kotanko P, Kamer AR, Levin NW. Periodontal diseases--a modifiable source of systemic inflammation for the end-stage renal disease patient on haemodialysis therapy? Nephrol Dial Transplant 2006; 22:312-5. [PMID: 17071738 DOI: 10.1093/ndt/gfl604] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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28
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Craig RG, Kamer AR, Kallur SP, Inoue M, Tarnow DP. Effects of Periodontal Cell Grafts and Enamel Matrix Proteins on the Implant–Connective Tissue Interface: A Pilot Study in the Minipig. J ORAL IMPLANTOL 2006; 32:228-36. [PMID: 17069167 DOI: 10.1563/820.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract
We have developed an experimental model to help identify and characterize factors necessary for periodontal connective tissue attachment formation on dental implants. In this pilot study, we report the effect of autogenous periodontal cell grafts, with and without the application of enamel matrix derivative (EMD), on the implant–connective tissue interface. Periodontal ligament (PDL) and gingival connective tissue (GCT) cultures were established from an adult minipig. Implants were placed in osteotomies prepared with exaggerated countersinks that served as recipient sites for autogenous cell grafts in bilateral edentulated posterior mandibular sextants. In addition, 1 side received an application of EMD before placement of the autogenous cell grafts. A bioabsorbable membrane covering the coronal portion of the implants was placed before closure. After 8 weeks, quantitative histomorphometric and qualitative light microscopic analyses revealed that the implants that received gelatin vehicle alone were surrounded by bone, whereas the implants that received GCT cell grafts were mostly surrounded by fibrous connective tissue. In contrast, implants that received PDL cells without the application of EMD demonstrated good bone contact, but strands of epithelium were observed in the implant–connective tissue interface. Implants that received PDL cells and EMD also had good bone contact but without evidence of epithelium. A cementum-like interface was not observed in any of the groups. Results of this pilot study suggest that EMD and the type of cell populations present in the implant wound-healing environment may alter the implant–connective tissue interface.
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Affiliation(s)
- Ronald G Craig
- Department of Periodontics and Basic Science, New York University College of Dentistry, New York, NY 10010, USA.
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Kamer AR, El-Ghorab N, Marzec N, Margarone JE, Dziak R. Nicotine induced proliferation and cytokine release in osteoblastic cells. Int J Mol Med 2006; 17:121-7. [PMID: 16328020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023] Open
Abstract
Smoking has deleterious effects on osteoporosis and periodontitis both characterized by bone loss. Smoking also interferes with the protective effect that hormone replacement therapy (HRT) has on bone loss. Our study investigated two mechanisms by which smoking may affect bone metabolism: nicotine-induced proliferation and nicotine-induced cytokine secretion in osteoblasts. Two osteoblastic cell models were used: mouse osteoblasts derived from mouse calvaria and human osteoblasts. Thymidine incorporation and immunoassays were used to evaluate proliferation, interleukin 6 (IL-6) and tumor necrosis factor alpha (TNF-alpha) secretion. Parametric and nonparametric statistical analyses were used for comparisons. The results showed that nicotine induced stimulation and inhibition of proliferation in both osteoblastic cell models. In human osteoblasts, the proliferative and inhibitory effects were also donor dependent. Il-6 secretion showed different patterns in mouse and human osteoblasts. In mouse osteoblasts, nicotine significantly increased IL-6 secretion and estradiol significantly inhibited the nicotine-induced IL-6 release. In human osteoblasts, cells derived from one subject did not respond to nicotine. However, in the second sample, nicotine increased secretion of Il-6 but estradiol did not oppose this effect. In human osteoblasts, nicotine also induced an increase in the TNF-alpha secretion and estradiol opposed this increase. These results suggest that nicotine affects bone metabolism by modulating proliferation, and Il-6 and TNF-alpha secretion. These studies provide a possible explanation for differences in bone loss among subjects who smoke and offer a possible mechanism for the oppositional effect of smoking on HRT in subjects with bone loss.
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Affiliation(s)
- Angela R Kamer
- NYU College of Dentistry, Department of Periodontics, New York, NY 10010, USA.
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Kamer AR, Sacks PG, Vladutiu A, Liebow C. EGF mediates multiple signals: dependence on the conditions. Int J Mol Med 2004; 13:143-7. [PMID: 14654986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023] Open
Abstract
Epidermal growth factor (EGF) has been reported to both increase and decrease proliferation and apoptosis. In KB cells, EGF-induced alteration in proliferation and apoptosis are concentration and time dependent. High concentrations of EGF (10(-7) and 10(-8) M) stimulated proliferation and inhibited apoptosis at 24 h, with apoptosis increasing with prolonged exposure. Low concentrations of EGF (10(-10)-10(-11) M) inhibited apoptosis without affecting proliferation. EGFR protein expression was downregulated at high and upregulated at low EGF concentrations. Significant inverse correlation was shown between EGFR expression level and apoptosis. These results suggest the EGF receptor involvement in the modulation of apoptosis and the role of EGF anti-apoptotic effects in EGF-induced apoptosis.
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Affiliation(s)
- Angela R Kamer
- Department of Periodontics, NYU College of Dentistry, New York, NY 10010, USA.
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Kamer AR, Krebs L, Hoghooghi SA, Liebow C. Proliferative and apoptotic responses in cancers with special reference to oral cancer. Crit Rev Oral Biol Med 2000; 10:58-78. [PMID: 10759427 DOI: 10.1177/10454411990100010301] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The study of signal transduction pathways for mechanisms of apoptosis and proliferation has significantly advanced our understanding of human cancer, subsequently leading to more effective treatments. Discoveries of growth factors and oncogenes, especially those that function through phosphorylation on tyrosine residues, have greatly benefited our appreciation of the biology of cancer. The regulation of proliferation and apoptosis through phosphorylation via tyrosine kinases and phosphatases is discussed, as well as the contributions of other systems, such as serine and threonine kinases and phosphatases. Receptors with seven-transmembrane domains, steroid hormones, genes, and "death domains" will also be discussed. This review attempts to compare the regulation of the growth of normal tissues and cancers with an effort to highlight the current knowledge of these factors in the growth regulation of oral/oropharyngeal cancers. Despite the strides made in our understanding of growth regulation in human cancers, the study of oral/oropharyngeal cancer specifically lags behind. More research must be done to further our understanding of oral cancer biology, if we are to develop better, more effective treatment protocols.
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Affiliation(s)
- A R Kamer
- Department of Oral and Maxillofacial Surgery, School of Dental Medicine, State University of New York at Buffalo, 14214, USA
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Oberdoerster J, Kamer AR, Rabin RA. Differential effect of ethanol on PC12 cell death. J Pharmacol Exp Ther 1998; 287:359-65. [PMID: 9765357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Our goal was to examine the effects of ethanol on cell death using rat pheochromocytoma (PC12) cells as a neuronal model. Withdrawal of serum for 24 hr increased the number of PC12 cells labeled with ethidium homodimer indicating an increase in cell death. Inclusion of 50 mM ethanol during the serum deprivation further increased the amount of ethidium fluorescence by 39%. Although reducing the serum concentration from the usual 15 to 4% did not alter cellular viability, a significant increase in the amount of ethidium fluorescence was observed in PC12 cells incubated for 24 hr in the presence of 4% serum and 150 mM ethanol. No change in viability was observed in cells exposed to either 150 mM ethanol in the presence of 15% serum or 50 mM ethanol in the presence of 4% serum. Inclusion of ethanol during serum deprivation increased the amount of soluble DNA found in the 15,000 x g supernatant. Similarly, using the terminal deoxynucleotidyl transferase dUTP nick-end labeling method to visualize DNA fragmentation in situ, ethanol caused a 213% increase in the number of PC12 cells labeled during serum withdrawal. Agarose gel electrophoresis of the DNA isolated from cells maintained in the absence of serum yielded the classical DNA laddering pattern of 180 to 200 bp fragments suggestive of apoptosis. Ethanol caused a concentration-dependent increase in the amount of DNA laddering in cells deprived of serum. Furthermore, ethanol significantly potentiated the DNA laddering of cells maintained in 4% serum. In contrast to the ethanol-induced increase in cell death when serum factors were reduced or withdrawn, 150 mM ethanol lowered by 34% the number of ethidium-labeled PC12 cells observed after a 30-min exposure to 2 mM H2O2. Similarly, agarose gel electrophoresis of the DNA from H2O2-treated cells did not display DNA laddering. This study demonstrates that: 1) ethanol antagonizes the trophic action of serum factors; 2) pharmacologically relevant ethanol concentrations significantly potentiate apoptosis after serum withdrawal and 3) this enhancement appears specific for apoptosis.
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Affiliation(s)
- J Oberdoerster
- Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, New York, USA
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Kamer AR, Hoghooghi SA, Liebow C. Epidermal growth factor downregulates the expression of SH-PTP2. Int J Mol Med 1998; 1:735-9. [PMID: 9852290 DOI: 10.3892/ijmm.1.4.735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protein phosphorylation/dephosphorylation on tyrosine residues are regulated by tyrosine kinases/phosphatases. The tyrosine phosphatase SH-PTP2 (PTP1D, PTP2C) interacts physically through its SH2 domain with phosphorylated epidermal growth factor receptor (EGFR). In KB cells, an oral epidermoid carcinoma, high epidermal growth factor (EGF) concentrations (10-9, 10-8 and 10-7 M) downregulate its receptor for the duration of the incubation with EGF. Thus, it was hypothesized that in KB cells, SH-PTP2 expression would also be downregulated by high EGF concentrations. This hypothesis was investigated by incubating the KB cells with increasing concentrations of EGF (0, 10-11, 10-10, 10-9, 10-8, 10-7 M) and by evaluating the expression of SH-PTP2 protein under these conditions. This study showed that EGF 10-7 and 10-8 M significantly decreased SH-PTP2 protein expression compared to controls. EGF 10-10 and 10-11 M did not change the expression of SH-PTP2 protein. We conclude that high EGF concentrations downregulate the expression of SH-PTP2 protein.
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Affiliation(s)
- A R Kamer
- Oral Maxillofacial Department, School of Dental Medicine, SUNY at Buffalo, NY 14214, USA
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Crean DH, Liebow C, Lee MT, Kamer AR, Schally AV, Mang TS. Alterations in receptor-mediated kinases and phosphatases during carcinogenesis. J Cancer Res Clin Oncol 1995; 121:141-9. [PMID: 7713985 DOI: 10.1007/bf01198095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Increased phosphorylation in cancers can stimulate growth and up-regulate certain receptors. To test whether the functional response of phosphatase receptors is up-regulated during carcinogenesis, we examined the effects of ligands on net phosphorylation in isolated membranes derived from hamster cheek-pouch tissues undergoing malignant transformation. The buccal mucosa of groups of Syrian golden hamsters was exposed thrice weekly to 0.5% dimethylbenzanthracene (DMBA) in acetone for 2-12 weeks to produce premalignant and malignant tissues. Homogenates of these tissues were then incubated with [32P]ATP in the presence of epidermal growth factor (EGF), agonist of somatostatin analogue RC-160, luteinizing-hormone-releasing hormone (LH-RH) [D-Trp6]LH-RH, or combinations of EGF, RC-160, and [D-Trp6]LH-RH. Changes compared to controls in phosphorylation in response to ligands provided estimates of kinase or phosphatase activity. Phosphorylation increased continuously, from the first application of DMBA in a linear fashion, and independently of EGF stimulation. RC-160 and [D-Trp6]LH-RH reduced phosphorylation in vitro. This response occurred in premalignant (weeks 6-10 after DMBA application) as well as malignant tissues (week 12 after DMBA application), but was not significant in normal tissues. The results show a continuous augmentation in phosphatase activity prior to the appearance of cancers, but with a delay in expression following the primary event of increased kinase activity. Significantly less phosphorylation of substrates was induced by both RC-160 and [D-Trp6]LH-RH after in vitro activation by EGF than in the absence of EGF. This suggests that EGF activates latent systems of hormonal receptors. Collectively, these results support the hypothesis that the enhancement of the hormonally stimulated phosphatase in cancers occurs secondarily to the increased kinase activity.
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Affiliation(s)
- D H Crean
- Great Lakes Biomedical Laser Institute, Department of Oral and Maxillofacial Surgery, School of Dental Medicine, Buffalo, NY, USA
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Abstract
Bombesin and gastrin-releasing peptide act as autocrine mitogens in various cancers. Bombesin antagonist RC-3095 inhibited growth in some cancers and slowed the progression of premalignant lesions, possibly by down-regulating epidermal growth factor (EGF) receptors. Since the EGF receptor mitogen response involves tyrosine kinase stimulation, we tested the hypotheses that bombesin stimulates, and RC-3095 inhibits, phosphorylation; EGF and bombesin promote the phosphorylation of the same substrates; and EGF and bombesin act synergistically on phosphorylation. Therefore, in vitro assays for phosphorylation were performed in the presence or absence of EGF, bombesin, RC-3095, and combinations in samples derived from tumor, tissue surrounding tumor, cell lines, and normal and transforming tissue derived from the 9,10-dimethyl-1,2-benzanthracene-induced squamous cell lesions of the hamster cheek pouch. Bombesin increased, and RC-3095 decreased, phosphorylation in these samples. In the human hepatoma sample and surrounding tissue, these ligands altered the phosphorylation of the same substrates affected by EGF. EGF and bombesin stimulated phosphorylation synergistically in the hamster samples and the hepatoma. Bombesin-induced phosphorylation was greater in tissue surrounding the hepatoma, whereas RC-3095 was more effective in inhibiting phosphorylation in the hepatoma itself. This cancer, therefore, could be endogenously stimulated by gastrin-releasing peptide. These observations support the hypothesis that bombesin stimulates growth of tissues and tumors by amplifying the phosphorylation response to EGF. The growth inhibitory response to RC-3095, or other bombesin analogues, of individual tumors may be prognosed by in vitro phosphorylation assays using the samples from the patient's tumor.
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Affiliation(s)
- C Liebow
- Department of Oral Surgery, School of Dental Medicine, State University of New York at Buffalo 14214
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Liebow C, Lee MT, Kamer AR, Schally AV. Regulation of luteinizing hormone-releasing hormone receptor binding by heterologous and autologous receptor-stimulated tyrosine phosphorylation. Proc Natl Acad Sci U S A 1991; 88:2244-8. [PMID: 1672452 PMCID: PMC51207 DOI: 10.1073/pnas.88.6.2244] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Pancreatic cancers overexpress tyrosine kinase and luteinizing hormone-releasing hormone (LH-RH) receptor (LH-RHR)-mediated tyrosine phosphatase. LH-RHR is a 60-kDa protein. One of the substrates of epidermal growth factor (EGF)-stimulated tyrosine kinase activity and LH-RH- and somatostatin-stimulated tyrosine phosphatase activity is also a 60-kDa protein. This suggests the possibility that LH-RHR regulation by tyrosine phosphatase and tyrosine kinase is mediated by (de)phosphorylation of existing LH-RHR. To test this hypothesis, membranes of MIA PaCa-2 cells, a human dedifferentiated pancreatic cancer cell line, were incubated without hormone (control) or with 0.1 microM EGF or somatostatin analogue RC-160 for 1 hr at 4 degrees C to phosphorylate the 60-kDa protein. Competition binding experiments with I125-labeled [D-Trp6]LH-RH by displacement with a nonradioactive ligand showed that the LH-RH binding in 69% of the points was increased by EGF and 85% was decreased by RC-160 compared with controls (n = 61; both significant, P less than 0.001). The specific binding was altered, increasing 50-150% after preincubation with EGF and decreasing 60-70% after RC-160. No change was seen in the binding affinity constant after pretreatment with EGF or RC-160. This shows that phosphorylation regulates binding of LH-RH and may explain the up-regulation by EGF and down-regulation by RC-160 and by LH-RH of the LH-RH response.
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Affiliation(s)
- C Liebow
- Department of Oral Surgery, State University of New York, Buffalo School of Dental Medicine 14214
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Lee MT, Liebow C, Kamer AR, Schally AV. Effects of epidermal growth factor and analogues of luteinizing hormone-releasing hormone and somatostatin on phosphorylation and dephosphorylation of tyrosine residues of specific protein substrates in various tumors. Proc Natl Acad Sci U S A 1991; 88:1656-60. [PMID: 1672042 PMCID: PMC51083 DOI: 10.1073/pnas.88.5.1656] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Analogues of somatostatin (SS) and luteinizing hormone-releasing hormone (LH-RH) activate tyrosine phosphatases in MIA PaCa-2 human pancreatic cancer cell line membranes and inhibit growth. We compared the substrates phosphorylated by epidermal growth factor (EGF) to those dephosphorylated by the SS analogue RC-160 (D-Phe-Cys-Tyr-D-Trp-Lys-Val-Cys-Trp-NH2) and [D-Trp6]LH-RH in cancer cell lines such as MIA PaCa-2 (human pancreatic cancer), HCPC (hamster cheek pouch carcinoma), A-549 (human lung cancer), HT-29 (human colon cancer), and R3230AC (breast cancer). EGF phosphorylated proteins of 170, 65, and 60 kDa and analogues of SS and LH-RH promoted the dephosphorylation of these proteins in MIA PaCa-2 and HCPC cell lines. The EGF receptor is 170 kDa. pp60src (60 kDa) is known to be a substrate for EGF receptor. The LH-RH receptor is also 60 kDa. The effects of RC-160 and [D-Trp6]LH-RH were quantitatively different. Examinations of HT-29, A-549, and R3230AC cancer cell lines revealed no phosphorylation by EGF or dephosphorylation by RC-160 and [D-Trp6]LH-RH. In addition to the 170-, 65-, and 60-kDa proteins, 35-kDa proteins were also phosphorylated in some cancer cell lines. This work demonstrates that analogues of SS and LH-RH can reverse the effects of EGF biochemically as well as functionally.
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Affiliation(s)
- M T Lee
- Department of Oral and Maxillofacial Surgery, School of Dental Medicine, State University of New York, Buffalo 14214
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