Physiological nutrient pathways for iron and folate

Physiological nutrient pathways for iron and folate encompass the systemic and cellular mechanisms for the uptake, distribution, and metabolism of these essential micronutrients. Iron homeostasis is primarily regulated by the hepcidin-ferroportin axis and the transferrin receptor-mediated endocytosis of iron-bound transferrin (StatPearls: Iron Deficiency, 2023; UniProt: P02786). Folate pathways involve the transport of folates via the proton-coupled folate transporter (PCFT) and the reduced folate carrier (RFC), followed by enzymatic conversion by dihydrofolate reductase (DHFR) to active forms required for DNA synthesis and methylation (StatPearls: Folic Acid Deficiency, 2023; UniProt: P00374). These pathways are critical for erythropoiesis and cellular proliferation; consequently, their disruption is linked to anemias, neural tube defects, and various cancers (NIH: Dietary Supplement Fact Sheets). Therapeutic interventions often target specific components within these pathways, such as DHFR inhibition by methotrexate in oncology or iron supplementation in deficiency states (PubChem: CID 126941; CID 24952). Because this entry describes a broad physiological process involving multiple distinct proteins rather than a single molecular entity, it is classified as a pathway rather than a discrete therapeutic target.

Other names

Iron metabolismFolate metabolismMicronutrient transport and metabolismIron and folate homeostasis

Mechanisms include substrate replacement for nutritional deficiencies, competitive inhibition of folate-metabolizing enzymes (e.g., DHFR), chelation of excess iron, and modulation of iron export via ferroportin regulation.