Folate
Folate
Overview
Folate is a water-soluble B vitamin essential for one-carbon metabolism, including nucleotide synthesis, amino acid interconversion, and methylation reactions. In biology and medicine, the term can refer broadly to naturally occurring folate compounds as well as the folic acid form used in supplementation and drug-conjugation strategies. Adequate folate status is important for hematopoiesis, cellular proliferation, and normal neurologic function, while deficiency is classically associated with megaloblastic anemia and elevated homocysteine.
In biomedical research, folate is also widely used as a targeting ligand because folate receptors are overexpressed in some activated immune cells and cancer cells. This has made folic acid useful in nanomedicine and drug delivery systems, where it can be attached to carriers to improve selective uptake. Recent studies have also examined folate status in relation to bariatric surgery outcomes, kidney stone risk, cognitive function, and cardiometabolic or inflammatory disease mechanisms, reflecting its broad relevance across nutrition, metabolism, and targeted therapeutics.
Focus of Latest Publications
Recent publications have used folate in two main ways: as a clinical biomarker of nutritional status and as a molecular targeting component in engineered delivery systems.
In a prospective cohort study of patients undergoing bariatric surgery, investigators measured serum ferritin, folate, and vitamin B12 levels to assess whether these markers were associated with postoperative weight loss. The study context indicates that folate was evaluated as part of the nutritional profile surrounding bariatric surgery, alongside ferritin and vitamin B12, rather than as a direct intervention. This reflects the clinical importance of monitoring folate status in patients undergoing major weight-loss procedures, where micronutrient deficiencies can be relevant to recovery and long-term outcomes.
A separate cross-sectional NHANES analysis examined dietary and circulating folate markers in relation to kidney stones in American adults. The study framed folate status as biologically relevant to stone formation because folate participates in one-carbon metabolism, a pathway linked to metabolic processes implicated in kidney stone disease. The publication context suggests an observational association study rather than a causal intervention, with folate treated as a nutritional exposure and biomarker.
In neurocognitive research, a cohort study from the Hubei Memory and Aging Cohort examined serum homocysteine, hemoglobin, and Alzheimer’s biomarkers in the relationship between folate, vitamin B12, and cognitive function. The study context emphasizes that folate and vitamin B12 deficiency are significant risk factors for cognitive impairment, with homocysteine likely serving as a mechanistic intermediary. Related entities mentioned in the same research context included Beta amyloid and Serum glial fibrillary acidic protein, indicating that the investigators were considering folate status alongside biomarkers of neurodegeneration.
Folate also appeared in cardiovascular and hematologic contexts. In a case report of erythrovirus-B19-induced pure red cell aplasia revealing untreated HIV infection, folic acid supplementation was given together with antiretroviral therapy using dolutegravir and lamivudine, plus trimethoprim-sulfamethoxazole prophylaxis. Here, folic acid functioned as supportive therapy rather than a primary treatment. In another multi-omics study of dilated cardiomyopathy, drug-gene interaction mapping and molecular docking identified folic acid as a potential therapeutic candidate, suggesting interest in repurposing or mechanistic association rather than established clinical use.
Several studies used folic acid as a targeting ligand in drug delivery systems. One report described a folic acid-functionalized exopolysaccharide integrated into a coordination polymer for targeted and controlled drug release. The chemistry involved amide bond formation between the primary amine group of folic acid and the carboxyl group of the exopolysaccharide, producing an FA-functionalized material. Another study developed amino-functionalized Zn(II)-based trilinker metal-organic frameworks conjugated with folic acid to enable selective delivery of doxorubicin to MCF-7 breast cancer cells. In this setting, folic acid served as a receptor-targeting moiety to improve tumor selectivity for an antineoplastic payload.
Folic acid was also used in immune and inflammatory disease nanomedicine. A mitochondria-targeted salvianic acid A delivery system for rheumatoid arthritis incorporated folic acid to support folate receptor-mediated targeting of M-like macrophages, alongside triphenylphosphine for mitochondrial localization. Similarly, a nanoinformatics-guided study designed folic acid-functionalized fullerene therapies for lupus nephritis, selecting folic acid because of its affinity for folate receptors expressed on activated macrophages. These studies highlight folate receptor targeting as a strategy for directing therapeutics to inflammatory cells.
In oncology and microbiome-related research, folate appeared as part of multi-omics signatures and mechanistic hypotheses. A precision-microbiome analysis in microsatellite-stable colorectal cancer linked biosynthetic genes for inosine, riboflavin, and folate to durable clinical benefit, suggesting that folate-related microbial metabolism may contribute to treatment response. The same broader research area referenced organisms such as Fusobacterium nucleatum and Enterococcus faecium, underscoring the microbiome context in which folate biosynthesis was considered. Although these findings do not establish folate as a standalone therapy, they position folate metabolism as a potentially informative biomarker or pathway in cancer immunotherapy response.