PMID- 21684021 OWN - NLM STAT- MEDLINE DCOM- 20111214 LR - 20211020 IS - 1873-3735 (Electronic) IS - 0165-6147 (Print) IS - 0165-6147 (Linking) VI - 32 IP - 9 DP - 2011 Sep TI - Is hyperhomocysteinemia an Alzheimer's disease (AD) risk factor, an AD marker, or neither? PG - 562-71 LID - 10.1016/j.tips.2011.05.003 [doi] AB - Alzheimer's disease (AD) is the most common form of neurodegenerative disease. The vast majority cases of AD are sporadic, without clear cause, and a combination of environmental and genetic factors has been implicated. The hypothesis that homocysteine (Hcy) is a risk factor for AD was initially prompted by the observation that patients with histologically confirmed AD had higher plasma levels of Hcy, termed hyperhomocysteinemia (HHcy), than age-matched controls. Most evidence accumulated so far implicates HHcy as a risk factor for AD onset, but there are also conflicting results. In this review we summarize reports on the relationship between HHcy and AD from epidemiological investigations, including observational studies and randomized controlled clinical trials. We also examine recent in vivo and in vitro studies of potential mechanisms whereby HHcy could influence AD development. Finally, we discuss possible reasons for the existing conflicting data and provide suggestions for future studies. CI - Copyright (c) 2011 Elsevier Ltd. All rights reserved. FAU - Zhuo, Jia-Min AU - Zhuo JM AD - Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA 19140, USA. FAU - Wang, Hong AU - Wang H FAU - Pratico, Domenico AU - Pratico D LA - eng GR - R01 AG022512/AG/NIA NIH HHS/United States GR - R01 AG022512-01A1/AG/NIA NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Review DEP - 20110620 PL - England TA - Trends Pharmacol Sci JT - Trends in pharmacological sciences JID - 7906158 RN - 0 (Biomarkers) RN - 0LVT1QZ0BA (Homocysteine) SB - IM MH - Alzheimer Disease/epidemiology/etiology/*physiopathology MH - Animals MH - Biomarkers/blood MH - Homocysteine/*blood MH - Humans MH - Hyperhomocysteinemia/complications/*physiopathology MH - Risk Factors PMC - PMC3159702 MID - NIHMS306698 EDAT- 2011/06/21 06:00 MHDA- 2011/12/15 06:00 PMCR- 2012/09/01 CRDT- 2011/06/21 06:00 PHST- 2011/03/16 00:00 [received] PHST- 2011/05/11 00:00 [revised] PHST- 2011/05/12 00:00 [accepted] PHST- 2011/06/21 06:00 [entrez] PHST- 2011/06/21 06:00 [pubmed] PHST- 2011/12/15 06:00 [medline] PHST- 2012/09/01 00:00 [pmc-release] AID - S0165-6147(11)00081-2 [pii] AID - 10.1016/j.tips.2011.05.003 [doi] PST - ppublish SO - Trends Pharmacol Sci. 2011 Sep;32(9):562-71. doi: 10.1016/j.tips.2011.05.003. Epub 2011 Jun 20.