PMID- 34200792 OWN - NLM STAT- MEDLINE DCOM- 20210726 LR - 20211118 IS - 1422-0067 (Electronic) IS - 1422-0067 (Linking) VI - 22 IP - 12 DP - 2021 Jun 10 TI - Homocysteine and Age-Related Central Nervous System Diseases: Role of Inflammation. LID - 10.3390/ijms22126259 [doi] LID - 6259 AB - Hyperhomocysteinemia (HHcy) is remarkably common among the aging population. The relation between HHcy and the development of neurodegenerative diseases, such as Alzheimer's disease (AD) and eye diseases, and age-related macular degeneration (AMD) and diabetic retinopathy (DR) in elderly people, has been established. Disruption of the blood barrier function of the brain and retina is one of the most important underlying mechanisms associated with HHcy-induced neurodegenerative and retinal disorders. Impairment of the barrier function triggers inflammatory events that worsen disease pathology. Studies have shown that AD patients also suffer from visual impairments. As an extension of the central nervous system, the retina has been suggested as a prominent site of AD pathology. This review highlights inflammation as a possible underlying mechanism of HHcy-induced barrier dysfunction and neurovascular injury in aging diseases accompanied by HHcy, focusing on AD. FAU - Tawfik, Amany AU - Tawfik A AUID- ORCID: 0000-0002-0245-8256 AD - Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA 30912, USA. AD - James and Jean Culver Vision Discovery Institute, MCG, Augusta University, Augusta, GA 30912, USA. AD - Department of Cellular Biology and Anatomy, Medical College of Georgia (MCG), Augusta University, Augusta, GA 30912, USA. AD - Department of Ophthalmology, MCG, Augusta University, Augusta, GA 30912, USA. AD - Eye Research Institue, Oakland University, Rochester, MI 48309, USA. FAU - Elsherbiny, Nehal M AU - Elsherbiny NM AUID- ORCID: 0000-0001-5167-3377 AD - Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA 30912, USA. AD - James and Jean Culver Vision Discovery Institute, MCG, Augusta University, Augusta, GA 30912, USA. AD - Department of Biochemistry, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt. FAU - Zaidi, Yusra AU - Zaidi Y AD - Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA 30912, USA. AD - James and Jean Culver Vision Discovery Institute, MCG, Augusta University, Augusta, GA 30912, USA. FAU - Rajpurohit, Pragya AU - Rajpurohit P AD - Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA 30912, USA. AD - James and Jean Culver Vision Discovery Institute, MCG, Augusta University, Augusta, GA 30912, USA. LA - eng GR - 1R01EY029751-02/NEI grant awards/ GR - R01 EY029751/EY/NEI NIH HHS/United States GR - #16SDG3070001/American Heart Association/ GR - P30 EY031631/EY/NEI NIH HHS/United States GR - P30EY031631/EY/NEI NIH HHS/United States PT - Journal Article PT - Review DEP - 20210610 PL - Switzerland TA - Int J Mol Sci JT - International journal of molecular sciences JID - 101092791 RN - 0LVT1QZ0BA (Homocysteine) SB - IM MH - Age Factors MH - Animals MH - Central Nervous System Diseases/etiology/metabolism/*pathology MH - Homocysteine/*metabolism MH - Humans MH - Hyperhomocysteinemia/etiology/metabolism/*pathology MH - Inflammation/*physiopathology PMC - PMC8230490 OTO - NOTNLM OT - Alzheimer's disease OT - age-related macular degeneration OT - diabetic retinopathy OT - hyperhomocysteinemia OT - inflammation COIS- The authors declare no conflict of interest. EDAT- 2021/07/03 06:00 MHDA- 2021/07/27 06:00 PMCR- 2021/06/10 CRDT- 2021/07/02 01:08 PHST- 2021/04/22 00:00 [received] PHST- 2021/06/02 00:00 [revised] PHST- 2021/06/07 00:00 [accepted] PHST- 2021/07/02 01:08 [entrez] PHST- 2021/07/03 06:00 [pubmed] PHST- 2021/07/27 06:00 [medline] PHST- 2021/06/10 00:00 [pmc-release] AID - ijms22126259 [pii] AID - ijms-22-06259 [pii] AID - 10.3390/ijms22126259 [doi] PST - epublish SO - Int J Mol Sci. 2021 Jun 10;22(12):6259. doi: 10.3390/ijms22126259.