PMID- 30626145 OWN - NLM STAT- MEDLINE DCOM- 20190426 LR - 20200225 IS - 1422-0067 (Electronic) IS - 1422-0067 (Linking) VI - 20 IP - 1 DP - 2019 Jan 8 TI - The Controversial Role of Homocysteine in Neurology: From Labs to Clinical Practice. LID - 10.3390/ijms20010231 [doi] LID - 231 AB - Homocysteine (Hcy) is a sulfur-containing amino acid that is generated during methionine metabolism. Physiologic Hcy levels are determined primarily by dietary intake and vitamin status. Elevated plasma levels of Hcy can be caused by deficiency of either vitamin B12 or folate. Hyperhomocysteinemia (HHcy) can be responsible of different systemic and neurological disease. Actually, HHcy has been considered as a risk factor for systemic atherosclerosis and cardiovascular disease (CVD) and HHcy has been reported in many neurologic disorders including cognitive impairment and stroke, independent of long-recognized factors such as hyperlipidemia, hypertension, diabetes mellitus, and smoking. HHcy is typically defined as levels >15 micromol/L. Treatment of hyperhomocysteinemia with folic acid and B vitamins seems to be effective in the prevention of the development of atherosclerosis, CVD, and strokes. However, data from literature show controversial results regarding the significance of homocysteine as a risk factor for CVD and stroke and whether patients should be routinely screened for homocysteine. HHcy-induced oxidative stress, endothelial dysfunction, inflammation, smooth muscle cell proliferation, and endoplasmic reticulum (ER) stress have been considered to play an important role in the pathogenesis of several diseases including atherosclerosis and stroke. The aim of our research is to review the possible role of HHcy in neurodegenerative disease and stroke and to understand its pathogenesis. FAU - Moretti, Rita AU - Moretti R AUID- ORCID: 0000-0002-9731-2697 AD - Neurology Clinic, Department of Medical, Surgical, and Health Sciences, University of Trieste, 34149 Trieste, Italy. moretti@units.it. FAU - Caruso, Paola AU - Caruso P AD - Neurology Clinic, Department of Medical, Surgical, and Health Sciences, University of Trieste, 34149 Trieste, Italy. paolacaruso83@gmail.com. LA - eng PT - Journal Article PT - Review DEP - 20190108 PL - Switzerland TA - Int J Mol Sci JT - International journal of molecular sciences JID - 101092791 RN - 0 (Reactive Oxygen Species) RN - 0LVT1QZ0BA (Homocysteine) RN - P6YC3EG204 (Vitamin B 12) SB - IM MH - Animals MH - Homocysteine/*metabolism MH - Humans MH - Inflammation/pathology MH - *Neurology MH - *Practice Patterns, Physicians' MH - Reactive Oxygen Species/metabolism MH - Vitamin B 12/metabolism PMC - PMC6337226 OTO - NOTNLM OT - dementias OT - homocysteine OT - inflammation OT - stroke OT - vascular endothelium COIS- None of the authors have potential conflicts of interest to be disclosed. EDAT- 2019/01/11 06:00 MHDA- 2019/04/27 06:00 PMCR- 2019/01/01 CRDT- 2019/01/11 06:00 PHST- 2018/11/29 00:00 [received] PHST- 2018/12/29 00:00 [revised] PHST- 2019/01/04 00:00 [accepted] PHST- 2019/01/11 06:00 [entrez] PHST- 2019/01/11 06:00 [pubmed] PHST- 2019/04/27 06:00 [medline] PHST- 2019/01/01 00:00 [pmc-release] AID - ijms20010231 [pii] AID - ijms-20-00231 [pii] AID - 10.3390/ijms20010231 [doi] PST - epublish SO - Int J Mol Sci. 2019 Jan 8;20(1):231. doi: 10.3390/ijms20010231.