GO:0070837 dehydroascorbic acid transport: Vitamin C Recycling Pathway, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0070837 dehydroascorbic acid transport describes the directed movement of dehydroascorbate (DHA), the oxidized form of vitamin C, across membranes via transporters or pores.
• Glucose transporters of the GLUT/SLC2A family, especially GLUT1 (SLC2A1), are the principal facilitators of DHA uptake in mammalian cells.
• Once inside cells, DHA is rapidly reduced to ascorbate, creating a gradient that drives further DHA transport and supports intracellular vitamin C recycling.
• DHA transport is functionally distinct from SVCT1/SVCT2-mediated ascorbate transport and is inhibited by glucose analogs and intracellular DHA accumulation.
• DHA uptake contributes to vitamin C accumulation in tissues and has been linked to selective cytotoxicity in KRAS- and BRAF-mutant colorectal cancer cells.
• CRISPR knockout, point-mutation, and overexpression models of SLC2A1 and related genes are essential tools for dissecting DHA transport mechanisms and therapeutic potential.
Description
GO:0070837 dehydroascorbic acid transport is a biological process defined as the directed movement of dehydroascorbate (DHA) into, out of, or within a cell, or between cells, by means of some agent such as a transporter or pore. DHA is the oxidized form of vitamin C (ascorbate) and is generated when ascorbate scavenges reactive oxygen species. Because DHA is chemically unstable and can be taken up by cells through facilitative glucose transporters, its transport is a key step in vitamin C recycling and redox homeostasis. Understanding this process is important for researchers studying antioxidant defense, cancer metabolism, and metabolic regulation. The transport of DHA is mediated primarily by members of the glucose transporter family (GLUTs/SLC2A), with GLUT1 (SLC2A1) being the most extensively characterized. Unlike the sodium-dependent vitamin C transporters SVCT1 and SVCT2, which transport ascorbate, GLUTs transport DHA by facilitated diffusion. This distinction has functional consequences: DHA transport is competitive with glucose, and intracellular DHA can inhibit SVCT2-dependent ascorbate transport in mitochondria. The interplay between DHA and ascorbate transport systems shapes cellular vitamin C status and influences processes ranging from collagen synthesis to epigenetic regulation. Research on GO:0070837 has gained momentum because DHA uptake can be exploited therapeutically. For example, KRAS- and BRAF-mutant colorectal cancer cells preferentially accumulate DHA and undergo oxidative stress-induced cell death, suggesting a selective vulnerability. Chemical transport knockout of DHA in vivo has revealed its functions in development and disease. These findings underscore the need for precise genetic models to dissect the contribution of individual transporters and to identify new therapeutic targets.
dehydroascorbic acid transport At A Glance
| GO ID | GO:0070837 |
|---|---|
| GO term | dehydroascorbic acid transport |
| Ontology | biological_process |
| Synonym | dehydroascorbate transport |
| Definition | The directed movement of dehydroascorbate into, out of, or within a cell, or between cells, by means of some agent such as a transporter or pore. |
| Major function | Facilitated uptake and distribution of the oxidized form of vitamin C, supporting intracellular redox balance and vitamin C recycling. |
| Key transporters | GLUT1 (SLC2A1), GLUT3 (SLC2A3), GLUT4 (SLC2A4), and other facilitative glucose transporters. |
| Substrate | Dehydroascorbate (DHA), the oxidized form of vitamin C. |
| Related process | Ascorbate transport (SVCT1/SVCT2), glutathione metabolism, oxidative stress response. |
What Is GO:0070837?
In simple terms, GO:0070837 dehydroascorbic acid transport is the process by which cells move dehydroascorbate, the oxidized form of vitamin C, across biological membranes. The Gene Ontology defines it as the directed movement of dehydroascorbate into, out of, or within a cell, or between cells, by means of some agent such as a transporter or pore. Dehydroascorbate, chemically 5-(1,2-dihydroxyethyl)furan-2,3,4(5H)-trione, is an oxidized form of vitamin C. This process is distinct from the transport of ascorbate itself and typically involves facilitative glucose transporters rather than sodium-dependent vitamin C transporters.
Why Is dehydroascorbic acid transport Important in Cell Biology?
GO:0070837 dehydroascorbic acid transport is important because it governs the cellular entry of DHA, a molecule that can be either recycled back to ascorbate or contribute to oxidative stress. This transport step influences vitamin C availability in tissues, modulates redox signaling, and has been implicated in cancer cell vulnerability and metabolic regulation. Because DHA transport is mediated by glucose transporters, it also intersects with glucose metabolism and insulin-responsive tissues, making it relevant to diabetes and metabolic research.
• DHA transport is a key route for vitamin C accumulation in cells that lack or have low expression of sodium-dependent vitamin C transporters.
• It supports intracellular recycling of vitamin C, maintaining the cellular antioxidant pool.
• DHA uptake via GLUT1 is competitive with glucose, linking vitamin C transport to glucose homeostasis.
• Intracellular DHA inhibits SVCT2-dependent ascorbate transport in mitochondria, revealing cross-talk between transport systems.
• DHA transport contributes to selective cytotoxicity in KRAS- and BRAF-mutant colorectal cancer cells, suggesting a therapeutic window.
• Chemical transport knockout of DHA in vivo has demonstrated its roles in development and tissue function.
• DHA transport is relevant to neurodegenerative diseases where oxidative stress and vitamin C depletion are observed.
• It is a potential target for modulating redox balance in cancer and metabolic disorders.
• Understanding DHA transport requires genetic models that isolate transporter-specific contributions.
• DHA transport intersects with glutathione metabolism and ferroptosis pathways, expanding its research significance.
What Happens During dehydroascorbic acid transport?
Generation of dehydroascorbate from ascorbate
In simple terms: Vitamin C loses electrons while neutralizing harmful molecules and becomes dehydroascorbate.
Dehydroascorbate (DHA) is produced when ascorbate (vitamin C) is oxidized, typically during scavenging of reactive oxygen species. This oxidation can occur in the extracellular space or within cells, and the resulting DHA can either be recycled back to ascorbate or transported across membranes. The balance between ascorbate and DHA is a key determinant of cellular redox status.
Recognition and binding by facilitative glucose transporters
In simple terms: DHA resembles glucose enough that glucose transporters mistake it for sugar and let it in.
DHA is transported by members of the GLUT/SLC2A family, particularly GLUT1 (SLC2A1), through facilitated diffusion. Structural determinants in GLUT1 that mediate DHA transport have been identified, and these overlap with but are not identical to glucose-binding residues. Other GLUT isoforms, such as GLUT3 and GLUT4, can also transport DHA, albeit with different efficiencies.
Translocation across the membrane
In simple terms: The transporter changes shape to carry DHA from one side of the membrane to the other.
After binding, GLUT1 undergoes conformational changes that allow DHA to cross the lipid bilayer down its concentration gradient. This process is energy-independent and can be inhibited by glucose analogs such as cytochalasin B, which compete for the same transport pathway. The rate of DHA transport is influenced by the extracellular-to-intracellular DHA gradient, which is maintained by rapid intracellular reduction.
Intracellular reduction and trapping of ascorbate
In simple terms: Once inside, DHA is quickly converted back to vitamin C, so more DHA keeps flowing in.
Inside the cell, DHA is reduced to ascorbate by glutathione-dependent and other reducing systems. This reduction maintains a low intracellular DHA concentration, creating a gradient that drives further DHA uptake. The recycled ascorbate can then participate in antioxidant defense and enzymatic reactions.
Regulation and cross-talk with other transport systems
In simple terms: DHA transport is not isolated; it talks to other vitamin C transporters and can be turned up or down.
Intracellular DHA inhibits SVCT2-dependent transport of ascorbate in mitochondria, indicating functional cross-talk between DHA and ascorbate transport systems. Additionally, DHA transport can be modulated by glucose levels, insulin, and oxidative stress, which affect GLUT expression and localization. These regulatory interactions ensure that vitamin C homeostasis is maintained under varying metabolic conditions.
Key Genes Involved in GO:0070837 dehydroascorbic acid transport
The following genes encode transporters and enzymes that directly participate in or regulate dehydroascorbic acid transport (GO:0070837).
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC2A1 (GLUT1) | Primary facilitative transporter for DHA uptake | Most studied DHA transporter; target for cancer and metabolic research |
| SLC2A3 (GLUT3) | Neuronal glucose transporter that also transports DHA | Important for brain vitamin C accumulation |
| SLC2A4 (GLUT4) | Insulin-responsive glucose transporter with DHA transport activity | Links DHA transport to insulin signaling and diabetes |
| SLC23A1 (SVCT1) | Sodium-dependent ascorbate transporter | Distinct from DHA transport; provides context for vitamin C uptake |
| SLC23A2 (SVCT2) | Sodium-dependent ascorbate transporter | Mitochondrial ascorbate transport inhibited by DHA |
| GSR | Glutathione reductase, supports DHA reduction | Maintains reduced glutathione for DHA recycling |
| GCLC | Glutamate-cysteine ligase catalytic subunit | Glutathione synthesis for DHA reduction |
| GCLM | Glutamate-cysteine ligase modifier subunit | Regulates glutathione synthesis for DHA recycling |
| GAPDH | Glycolytic enzyme targeted by DHA in cancer cells | Mediates DHA-induced cytotoxicity in KRAS/BRAF mutants |
| KRAS | Oncogene that sensitizes cells to DHA | Predictive biomarker for DHA response |
| BRAF | Oncogene that sensitizes cells to DHA | Predictive biomarker for DHA response |
| TXN | Thioredoxin, contributes to redox balance | Modulates DHA-induced oxidative stress |
| TXN2 | Mitochondrial thioredoxin | Protects mitochondria from DHA-induced stress |
| PRDX1 | Peroxiredoxin, antioxidant enzyme | Involved in DHA-mediated redox signaling |
| SLC7A11 | Cystine/glutamate antiporter, supports glutathione synthesis | Modulates DHA sensitivity via glutathione |
| GPX4 | Glutathione peroxidase 4, lipid repair enzyme | Links DHA transport to ferroptosis |
| NQO1 | Quinone oxidoreductase, antioxidant enzyme | May influence DHA redox cycling |
How Is dehydroascorbic acid transport Regulated?
Dehydroascorbic acid transport is regulated at multiple levels. Expression and membrane localization of GLUT1 (SLC2A1) are modulated by glucose availability, insulin, and hypoxia, which in turn affect DHA uptake capacity. Intracellular DHA levels feedback to inhibit SVCT2-dependent ascorbate transport in mitochondria, providing a cross-regulatory mechanism. Additionally, oxidative stress can increase DHA production and alter transporter activity, while glutathione status determines the efficiency of DHA reduction and thus the gradient driving transport. These regulatory layers ensure that DHA transport is integrated with cellular metabolic and redox states.
dehydroascorbic acid transport and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC2A1 | Cancer (GLUT1 overexpression), GLUT1 deficiency syndrome | Knockout and overexpression in cancer cell lines |
| KRAS | Colorectal cancer, DHA sensitivity | Point mutation knock-in in colorectal cancer cells |
| BRAF | Melanoma, colorectal cancer, DHA sensitivity | Point mutation (V600E) knock-in in melanoma cells |
| GAPDH | DHA-induced cytotoxicity, glycolysis | Knockout and point mutation in cancer cells |
| SLC23A2 | Mitochondrial ascorbate transport, oxidative stress | Knockout in neuronal or mitochondrial models |
Cancer metabolism and selective vulnerability
DHA transport is exploited in cancer research because certain cancer cells, particularly those with KRAS or BRAF mutations, accumulate DHA and undergo oxidative stress-induced cell death. This selective toxicity is mediated in part by DHA targeting GAPDH, leading to glycolytic inhibition and energy crisis. GLUT1 overexpression in many cancers further enhances DHA uptake, making DHA transport a potential therapeutic target.
Neurodegeneration and oxidative stress
The brain maintains high concentrations of vitamin C, and DHA transport via GLUT1 and GLUT3 contributes to neuronal antioxidant defense. Impaired DHA transport or recycling has been linked to oxidative stress in neurodegenerative conditions, although direct causal evidence in humans remains limited. Researchers use neuronal models to study how DHA transport affects survival under oxidative challenge.
Metabolic disorders and diabetes
Because DHA shares transporters with glucose, conditions of hyperglycemia can competitively inhibit DHA uptake, potentially affecting vitamin C status in diabetes. This interplay is studied in insulin-responsive tissues where GLUT4 mediates both glucose and DHA transport. Understanding this competition may inform nutritional strategies for diabetic patients.
From dehydroascorbic acid transport-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SLC2A1 mediate DHA transport in a specific cell type? | CRISPR knockout of SLC2A1 followed by DHA uptake assays |
| Which structural residues of GLUT1 are required for DHA transport? | Point mutations in SLC2A1 based on structural predictions |
| Can DHA transport be visualized in live cells? | Knock-in of fluorescent tags into SLC2A1 |
| Does overexpression of GLUT1 increase DHA sensitivity? | Overexpression of SLC2A1 in cancer cell lines |
| What is the role of DHA transport in tumor growth? | Xenograft models with SLC2A1 knockout or overexpression |
| How does DHA transport affect mitochondrial function? | Knockout of SLC23A2 and SLC2A1 in mitochondrial reporter cells |
How to Study the dehydroascorbic acid transport Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled DHA uptake | Transport rate and specificity | Characterizing GLUT-mediated DHA transport |
| Fluorescent DHA analogs | Real-time uptake in live cells | High-throughput screening of transporter inhibitors |
| CRISPR knockout | Loss-of-function effects on DHA transport | Validating candidate transporters |
| Site-directed mutagenesis | Structural determinants of transport | Mapping GLUT1 residues required for DHA uptake |
| Metabolomics | Changes in redox metabolites and glycolysis | Assessing DHA-induced metabolic rewiring |
| Glutathione/ROS assays | Oxidative stress and antioxidant capacity | Linking DHA transport to redox biology |
| Hyperpolarized 13C imaging | DHA distribution and metabolism in vivo | Non-invasive metabolic imaging |
| Xenograft tumor models | Tumor growth and DHA sensitivity | Testing therapeutic potential of DHA transport modulation |
Radiolabeled and fluorescent DHA uptake assays
DHA transport is commonly measured using radiolabeled dehydroascorbic acid or fluorescent analogs in cultured cells. These assays quantify uptake rates and can be combined with transporter inhibitors to determine specificity. Hyperpolarized [1-13C]dehydroascorbic acid has been used for metabolic imaging.
Genetic manipulation and rescue experiments
CRISPR knockout of candidate transporters followed by DHA uptake measurements is a standard approach to establish causality. Rescue experiments with wild-type or mutant transporters can identify structural determinants. Overexpression studies complement knockout by testing gain of function.
Metabolic and redox profiling
DHA transport affects intracellular redox state, which can be monitored using glutathione assays, ROS-sensitive dyes, and metabolomics. Changes in glycolytic intermediates, such as those caused by GAPDH inhibition, can be detected by mass spectrometry.
In vivo models and imaging
Animal models with altered DHA transport can be studied using hyperpolarized magnetic resonance or positron emission tomography to visualize vitamin C distribution. Chemical transport knockout provides a complementary approach to genetic manipulation.
How CRISPR Can Be Used to Study GO:0070837 dehydroascorbic acid transport
Knockout
CRISPR knockout of SLC2A1 or other GLUT genes is used to eliminate DHA transport and measure the consequences on vitamin C accumulation, redox balance, and cell survival. Knockout models help distinguish the contribution of specific transporters from redundant pathways.
Point Mutation
Point mutations in SLC2A1 can be introduced to test the role of individual amino acid residues in DHA binding and translocation. Such models are valuable for understanding structural determinants and for mimicking human polymorphisms that affect transport efficiency.
Knock-in
Knock-in of epitope tags or fluorescent proteins into endogenous SLC2A1 allows visualization of transporter localization and trafficking in response to DHA or glucose. Knock-in of disease-associated mutations can model altered DHA transport in relevant cell types.
Overexpression
Overexpression of SLC2A1 or other DHA transporters increases DHA uptake and can sensitize cells to DHA-induced oxidative stress. This approach is used to study gain-of-function effects and to test whether enhanced DHA transport is sufficient to alter phenotypes such as tumor growth.
How EDITGENE Supports dehydroascorbic acid transport Research
Researchers studying dehydroascorbic acid transport-related genes often need to determine whether a candidate gene is causally involved in DHA uptake, recycling, or downstream redox effects. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional validation of genes implicated in GO:0070837.
Contact EDITGENE today to design your custom CRISPR model for dehydroascorbic acid transport research.
Frequently Asked Questions About dehydroascorbic acid transport
What is GO:0070837 dehydroascorbic acid transport?
GO:0070837 is a Gene Ontology biological process term that describes the directed movement of dehydroascorbate (DHA), the oxidized form of vitamin C, across cell membranes via transporters or pores.
What genes are involved in dehydroascorbic acid transport?
The main genes include SLC2A1 (GLUT1), SLC2A3 (GLUT3), and SLC2A4 (GLUT4), which encode facilitative glucose transporters that also transport DHA.
How is dehydroascorbic acid transported into cells?
DHA is transported by facilitative diffusion through glucose transporters, primarily GLUT1, down its concentration gradient.
What is the difference between ascorbate and dehydroascorbate transport?
Ascorbate is transported by sodium-dependent transporters SVCT1 and SVCT2, while dehydroascorbate is transported by facilitative glucose transporters such as GLUT1.
Why is dehydroascorbic acid transport important in cancer?
Some cancer cells, especially those with KRAS or BRAF mutations, take up DHA avidly and undergo oxidative stress-induced cell death, making DHA transport a potential therapeutic target.
Can dehydroascorbic acid transport be inhibited?
Yes, glucose analogs and competitive inhibitors can block DHA transport through GLUTs, and intracellular DHA can inhibit SVCT2-dependent ascorbate transport.
What research methods are used to study dehydroascorbic acid transport?
Common methods include radiolabeled DHA uptake assays, fluorescent DHA analogs, CRISPR knockout of transporter genes, and metabolomic profiling.
How does dehydroascorbic acid transport relate to vitamin C recycling?
After transport, DHA is reduced intracellularly to ascorbate, which maintains the gradient for further DHA uptake and replenishes cellular vitamin C.
What diseases are associated with defects in dehydroascorbic acid transport?
Altered DHA transport has been linked to cancer metabolism, neurodegenerative conditions, and metabolic disorders such as diabetes.
How can CRISPR help study dehydroascorbic acid transport?
CRISPR knockout, point mutation, knock-in, and overexpression models allow researchers to test the causal role of specific transporters and to identify structural determinants of DHA transport.
Conclusion
GO:0070837 dehydroascorbic acid transport is a fundamental biological process that governs the cellular uptake of the oxidized form of vitamin C. Mediated largely by facilitative glucose transporters, this process is integral to vitamin C recycling, redox homeostasis, and metabolic regulation. Its relevance extends to cancer, neurodegeneration, and diabetes, where DHA transport can influence cell survival and stress responses. Continued research using precise genetic models will clarify the contributions of individual transporters and uncover new therapeutic opportunities.
References
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- 2. Padayatty SJ et al.. 2016. Vitamin C: the known and the unknown and Goldilocks.. Oral Dis 22(6):463-93 PMID: 26808119
- 3. Leung K. 2004. Hyperpolarized [1-(13)C]dehydroascorbic acid.. PMID: 22191116
- 4. Fiorani M et al.. 2015. Intracellular dehydroascorbic acid inhibits SVCT2-dependent transport of ascorbic acid in mitochondria.. Pharmacol Res 99:289-95 PMID: 26188149
- 5. Villagrán M et al.. 2023. Identification of Structural Determinants of the Transport of the Dehydroascorbic Acid Mediated by Glucose Transport GLUT1.. Molecules 28(2) PMID: 36677580
- 6. Tu H et al.. 2017. Chemical Transport Knockout for Oxidized Vitamin C, Dehydroascorbic Acid, Reveals Its Functions in vivo.. EBioMedicine 23:125-135 PMID: 28851583
- 7. Rivas CI et al.. 2008. Vitamin C transporters.. J Physiol Biochem 64(4):357-75 PMID: 19391462
- 8. Yun J et al.. 2015. Vitamin C selectively kills KRAS and BRAF mutant colorectal cancer cells by targeting GAPDH.. Science 350(6266):1391-6 PMID: 26541605
