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. 2020 Oct 22;10(11):762. doi: 10.3390/brainsci10110762

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Folic acid metabolism and 5-MTHF transport across the choroid plexus epithelium in the brain. Red arrows and red crosses indicate the alternative pathway induced by FRα deficiency. Blue arrows indicate effects of folinic acid treatment. KEYS: 5-MTHF: 5-methylenetetrahydrofolate; B6: Vitamin B6; B12: Vitamin B12; CSF: cerebrospinal fluid; DHFR: dihydrofolate reductase; FRα: receptor of folate alpha; Gly: glycine; GSH: glutathione reduced states; GSSG: Glutathione oxidized states; MS: methionine synthase; MTHFD: methylenetetrahydrofolate dehydrogenase; MTHFR: methylenetetrahydrofolate reductase; MTHFS: methylenetetrahydrofolate synthetase; PC: phosphatidylcholine; PCFT: proton coupled folate transporter; PI: phosphatidylinositol; RFC: reduced folate carrier; SAH: S-adenosyl homocysteine; SAM: S-adenosyl-methionine; Ser: Serine; SHMT: serine-hydroxy methyl transferase; SM: sphingomyelin.