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Microbes and Alzheimer's Disease Ruth Itzhaki Philadelphia College of Osteopathic Medicine DigitalCommons@PCOM PCOM Scholarly Papers 2016 Microbes and Alzheimer's Disease Ruth Itzhaki Richard Lathe Brian J. Balin Philadelphia College of Osteopathic Medicine, [email protected] Melvyn J. Ball Elaine L. Bearer See next page for additional authors Follow this and additional works at: http://digitalcommons.pcom.edu/scholarly_papers Part of the Immunology and Infectious Disease Commons Recommended Citation Itzhaki, Ruth; Lathe, Richard; Balin, Brian J.; Ball, Melvyn J.; Bearer, Elaine L.; Braak, Heiko; Bullido, Maria J.; Carter, Chris; Clerici, Mario; and al., et, "Microbes and Alzheimer's Disease" (2016). PCOM Scholarly Papers. Paper 1657. http://digitalcommons.pcom.edu/scholarly_papers/1657 This Article is brought to you for free and open access by DigitalCommons@PCOM. It has been accepted for inclusion in PCOM Scholarly Papers by an authorized administrator of DigitalCommons@PCOM. For more information, please contact [email protected]. Authors Ruth Itzhaki, Richard Lathe, Brian J. Balin, Melvyn J. Ball, Elaine L. Bearer, Heiko Braak, Maria J. Bullido, Chris Carter, Mario Clerici, and et al. This article is available at DigitalCommons@PCOM: http://digitalcommons.pcom.edu/scholarly_papers/1657 Journal of Alzheimer’s Disease 51 (2016) 979–984 979 DOI 10.3233/JAD-160152 IOS Press Editorial Microbes and Alzheimer’s Disease Ruth F. Itzhakia,∗, Richard Latheb,∗, Brian J. Balinc, Melvyn J. Balld, Elaine L. Bearere, Heiko Braakf , Maria J. Bullidog, Chris Carterh, Mario Clericii, S. Louise Cosbyj, Kelly Del Tredicif , Hugh Fieldk, Tamas Fulopl, Claudio Grassim, W. Sue T. Griffinn,Jurgen¨ Haasb, Alan P. Hudsono, Angela R. Kamerp, Douglas B. Kellq, Federico Licastror, Luc Letenneurs, Hugo Lovheim¨ t, Roberta Mancusou, Judith Miklossyv, Carola Otthw, Anna Teresa Palamarax, George Perryy, Christopher Prestonz, Etheresia Pretoriusaa, Timo Strandbergbb, Naji Tabetcc, Simon D. Taylor-Robinsondd and Judith A. Whittum-Hudsonee aFaculty of Life Sciences, University of Manchester, Oxford Road, Manchester, UK bDivision of Infection and Pathway Medicine, University of Edinburgh, Little France, Edinburgh, UK cCenter for Chronic Disorders of Aging, Philadelphia College of Osteopathic Medicine, Philadelphia, USA dDepartment of Pathology (Neuropathology), Oregon Health and Science University, Portland, OR, USA eDepartment of Pathology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA f Clinical Neuroanatomy Section, Department of Neurology, Center for Biomedical Research, University of Ulm, Ulm, Germany gCentro de Biologia Molecular ‘Severo Ochoa’ (CSIC-UAM), Universidad Autonoma de Madrid, and Centro de Investigacion en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain hPolygenic Pathways, Hastings, East Sussex, UK iUniversity of Milano and IRCCS SM Nascente, Don C Gnocchi Foundation, Milan, Italy jCentre for Infection and Immunity, Medical Biology Centre, Queen’s University, Belfast, UK kQueens’ College, Cambridge, UK lDepartment of Medicine, Division of Geriatrics, Universit´e de Sherbrooke, Sherbrooke, PQ, Canada mInstitute of Human Physiology, Medical School, Universit´a Cattolica, Rome; San Raffaele Pisana Scientific Institute for Research, Hospitalization, and Health Care, Rome, Italy nDepartment of Geriatrics, University of Arkansas for Medical Sciences, and Geriatric Research, Education, and Clinical Center, Little Rock, AR, USA oDepartment of Immunology and Microbiology, Wayne State University School of Medicine, Detroit, MI, USA pNYU College of Dentistry, Department of Periodontology and Implant Dentistry, New York, NY, USA qSchool of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester, UK rDepartment of Experimental, Diagnostic, and Specialty Medicine, School of Medicine, University of Bologna, Bologna, Italy sINSERM, Universit´e de Bordeaux, Bordeaux, France tDepartment of Community Medicine and Rehabilitation, Geriatric Medicine, Ume˚a University, Ume˚a, Sweden uDon Gnocchi Foundation ONLUS, Milan, Italy ∗Correspondence to: Current address: Prof. Ruth F. Itzhaki, Nuffield Department of Clinical Neurosciences, University of and Richard Lathe, Division of Infection and Pathway Medicine, Oxford, Level 6, West Wing, John Radcliffe Hospital, Oxford, UK. University of Edinburgh, 49 Little France Crescent, Edinburgh Tel.: +44 01865 250853; E-mail: [email protected] EH16 4SB, UK. E-mail: [email protected]. ISSN 1387-2877/16/$35.00 © 2016 – IOS Press and the authors. All rights reserved 980 R.F. Itzhaki et al. / Microbes and Alzheimer’s Disease vPrevention Alzheimer International Foundation, International Alzheimer Research Center, Martigny-Croix, Switzerland wInstitute of Clinical Microbiology, Faculty of Medicine, Austral University of Chile, Valdivia, Chile xDepartment 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 yCollege of Sciences, University of Texas at San Antonio, San Antonio, TX, USA zInstitute of Virology, Glasgow, UK aaApplied Morphology Research Centre, Department of Physiology, Faculty of Health Sciences, University of Pretoria, Arcadia, South Africa bbHelsinki University Hospital and University of Helsinki; University of Oulu, Centre of Life Course Health Research, Oulu, Finland ccDivision of Old Age Psychiatry, Brighton and Sussex Medical School, Brighton, UK ddSt Mary’s Hospital, Imperial College London, London, UK eeDepartments of Immunology and Microbiology, Internal Medicine (Rheumatology), and Ophthalmology, Wayne State University School of Medicine, Detroit, MI, USA Accepted 9 February 2016 We are researchers and clinicians working on affected, such that ‘controls’, even if infected, are Alzheimer’s disease (AD) or related topics, and we asymptomatic [2]. write to express our concern that one particular aspect of the disease has been neglected, even though treat- ment based on it might slow or arrest AD progression. EVIDENCE FOR AN INFECTIOUS/IMMUNE We refer to the many studies, mainly on humans, COMPONENT implicating specific microbes in the elderly brain, notably herpes simplex virus type 1 (HSV1), Chlamy- (i) Viruses and other microbes are present in dia pneumoniae, and several types of spirochaete, in the brain of most elderly people [11–13]. the etiology of AD [1–4]. Fungal infection of AD Although usually dormant, reactivation can brain [5, 6] has also been described, as well as abnor- occur after stress and immunosuppression; for mal microbiota in AD patient blood [7]. The first example, HSV1 DNA is amplified in the brain observations of HSV1 in AD brain were reported of immunosuppressed patients [14]. almost three decades ago [8]. The ever-increasing (ii) Herpes simplex encephalitis (HSE) produces number of these studies (now about 100 on HSV1 damage in localized regions of the CNS related alone) warrants re-evaluation of the infection and AD to the limbic system, which are associated concept. with memory, cognitive and affective processes AD is associated with neuronal loss and pro- [15], as well as personality (the same as those gressive synaptic dysfunction, accompanied by the affected in AD). deposition of amyloid-␤ (A␤) peptide, a cleavage (iii) In brain of AD patients, pathogen signatures product of the amyloid-␤ protein precursor (A␤PP), (e.g., HSV1 DNA) specifically colocalize with and abnormal forms of tau protein, markers that have AD pathology [13, 16, 17]. been used as diagnostic criteria for the disease [9, 10]. (iv) HSV infection, as revealed by seropositivity, These constitute the hallmarks of AD, but whether is significantly associated with development of they are causes of AD or consequences is unknown. AD [18–21]. We suggest that these are indicators of an infectious (v) AD has long been known to have a promi- etiology. In the case of AD, it is often not realized nent inflammatory component characteristic of that microbes can cause chronic as well as acute dis- infection (reviewed in [22, 23]). eases; that some microbes can remain latent in the (vi) Polymorphisms in the apolipoprotein E gene, body with the potential for reactivation, the effects APOE, that modulate immune function and of which might occur years after initial infection; susceptibility to infectious disease [24], also and that people can be infected but not necessarily govern AD risk (reviewed in [25, 26]). R.F. Itzhaki et al. / Microbes and Alzheimer’s Disease 981 Genome-wide association studies reveal that (iii) A␤ is an antimicrobial peptide with potent other immune system components, including activity against multiple bacteria and yeast virus receptor genes, are further AD risk factors [69]. A␤ also has antiviral activity [70–72]. [27–32]. (iv) Another antimicrobial peptide (␤-defensin 1) is (vii) Features of AD pathology are transmissible by upregulated in AD brain [73]. inoculation of AD brain to primates [33, 34] and mice [35, 36]. Regarding HSV1, about 100 publications by many groups indicate directly or indirectly that this virus is a major factor in the disease. They include studies EVIDENCE FOR CAUSATION suggesting that the virus confers risk of the disease when present in brain of carriers of the ␧4 allele of (i) In humans, brain infection (e.g., by HIV, her- APOE [74], an established susceptibility factor for pesvirus, measles) is known to be associated AD (APOE ␧4 determines susceptibility in several with AD-like
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