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Levomefolic acid (INN, also known as L-5-MTHF, L-methylfolate and L-5-methyltetrahydrofolate and (6S)-5-methyltetrahydrofolate, and (6S)-5-MTHF) is the primary biologically active form of folate used at the cellular level for DNA reproduction, the cysteine cycle and the regulation of homocysteine.
A different study corroborates these results and suggests a physiological dose (800 μg) of 5-methyltetrahydrofolate can bypass MTHFR C677T and A1298C isoforms in couples with fertility problems. [16] This treatment with 5-MTHF also avoids un-metabolized folic acid syndrome, which can occur with folic acid intakes of 5 mg per day. [16]
5,10-Methylenetetrahydrofolate (N5,N10-Methylenetetrahydrofolate; 5,10-CH 2-THF) is cofactor in several biochemical reactions. It exists in nature as the diastereoisomer [6R]-5,10-methylene-THF. As an intermediate in one-carbon metabolism, 5,10-CH 2 -THF converts to 5-methyltetrahydrofolate , 5-formyltetrahydrofolate , and methenyltetrahydrofolate.
4524 17769 Ensembl ENSG00000177000 ENSMUSG00000029009 UniProt P42898 Q9WU20 RefSeq (mRNA) NM_005957 NM_001330358 NM_001161798 NM_010840 RefSeq (protein) NP_001317287 NP_005948 NP_001155270 NP_034970 Location (UCSC) Chr 1: 11.79 – 11.81 Mb Chr 4: 148.12 – 148.14 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Methylenetetrahydrofolate reductase (MTHFR) is the rate-limiting enzyme ...
Probable mechanism by which folic acid impedes the entry of 5-MTHF into the central nervous system in vulnerable individuals. From Tomoyuki Akiyama et al., 2022. [18] "Transport of folate compounds from the intestine to the brain and competitive inhibition of 5MTHF transport by FA.
Patients present with cerebral folate deficiency, a condition in which there are reduced levels of 5-MTHF in the cerebrospinal fluid. However, contrary to other causes of cerebral folate deficiency, the use of folinic acid for treatment may be contraindicated due to excess levels of folinic acid in the organism of patients. [3]