TY - JOUR T1 - Protective effects of methylcobalamin, a vitamin B12 analog, against glutamate-induced neurotoxicity in retinal cell culture. AU - Kikuchi,M, AU - Kashii,S, AU - Honda,Y, AU - Tamura,Y, AU - Kaneda,K, AU - Akaike,A, PY - 1997/4/1/pubmed PY - 1997/4/1/medline PY - 1997/4/1/entrez SP - 848 EP - 54 JF - Investigative ophthalmology & visual science JO - Invest Ophthalmol Vis Sci VL - 38 IS - 5 N2 - PURPOSE: To examine the effects of methylcobalamin on glutamate-induced neurotoxicity in the cultured retinal neurons. METHODS: Primary cultures obtained from the fetal rat retina (gestation days 16 to 19) were used for the experiment. The neurotoxicity was assessed quantitatively using the trypan blue exclusion method. RESULTS: Glutamate neurotoxicity was prevented by chronic exposure to methylcobalamin and S-adenosylmethionine (SAM), which is formed in the metabolic pathway of methylcobalamin. Chronic exposure to methylcobalamin and SAM also inhibited the neurotoxicity induced by sodium nitroprusside that release nitric oxide. By contrast, acute exposure to methylcobalamin did not protect retinal neurons against glutamate neurotoxicity. CONCLUSIONS: Chronic administration of methylcobalamin protects cultured retinal neurons against N-methyl-D-aspartate-receptor-mediated glutamate neurotoxicity, probably by altering the membrane properties through SAM-mediated methylation. SN - 0146-0404 UR - https://www.unboundmedicine.com/medline/citation/9112980/Protective_effects_of_methylcobalamin_a_vitamin_B12_analog_against_glutamate_induced_neurotoxicity_in_retinal_cell_culture_ L2 - https://iovs.arvojournals.org/article.aspx?volume=38&issue=5&page=848 DB - PRIME DP - Unbound Medicine ER -