GO:0033591 response to L-ascorbic acid: Cellular Stress Response, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0033591 (response to L-ascorbic acid) describes any cellular or organismal change triggered by vitamin C, including gene expression, enzyme activity, and secretion.
• L-ascorbic acid acts as a cofactor for Fe(II)/2-oxoglutarate dioxygenases and as a modulator of redox signaling, influencing DNA damage responses and cell survival.
• The response is highly dose-dependent and cell-type-specific, with hormetic effects observed in colorectal cancer cells according to SVCT-2 expression.
• KRAS mutant pancreatic cancer cells show preferential sensitivity to L-ascorbic acid through DNA damage induction.
• Ascorbic acid derivatives and analogs are being explored for anti-allergic and anticancer activities, expanding the pharmacological scope of this response.
• Studying GO:0033591 requires integrated approaches such as CRISPR knockout, RNA-seq, and targeted metabolomics to dissect causal genes and pathways.
Description
GO:0033591, response to L-ascorbic acid, is a biological process that encompasses the molecular and cellular changes occurring when a cell or organism encounters vitamin C (L-ascorbic acid). This term captures a wide range of responses, from altered gene expression and enzyme production to changes in cell movement and secretion. L-ascorbic acid is an essential micronutrient with pleiotropic functions, including antioxidant defense, collagen hydroxylation, and epigenetic regulation. Its role in health and disease has been extensively studied, particularly in cancer, inflammation, and metabolic disorders. Understanding the response to L-ascorbic acid is critical for researchers investigating nutritional biochemistry, redox biology, and therapeutic strategies. The process is not uniform; it depends on cell type, dose, and the expression of specific transporters such as SVCT-2. Recent studies highlight that L-ascorbic acid can preferentially kill KRAS mutant pancreatic cancer cells through DNA damage, suggesting context-dependent vulnerabilities. Moreover, derivatives like 6-deoxy-2-O-methyl-6-(N-hexadecanoyl)amino-L-ascorbic acid exhibit antiallergic activity, indicating that the core response can be modulated by chemical modification. This article synthesizes authoritative QuickGO annotations and verified PubMed literature to provide a research-grade overview of GO:0033591, covering its definition, mechanisms, key genes, disease relevance, and experimental models.
response to L-ascorbic acid At A Glance
| GO ID | GO:0033591 |
|---|---|
| GO term | response to L-ascorbic acid |
| Ontology | biological_process |
| Synonym | response to ascorbic acid, response to L-ascorbate, response to vitamin C |
| Major function | Cellular and organismal adaptation to vitamin C stimulus, including gene expression, enzyme activity, and secretion changes |
| Related stimuli | L-ascorbic acid, ascorbate, vitamin C |
| Key transporters | SVCT-2 (SLC23A2) for sodium-dependent uptake |
| Dose-dependency | Hormetic effects observed in cancer cell lines |
| Disease relevance | Cancer, inflammatory bowel diseases, acute kidney injury |
What Is GO:0033591?
According to the Gene Ontology, GO:0033591 (response to L-ascorbic acid) is defined as any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an L-ascorbic acid (vitamin C) stimulus. This definition encompasses both rapid signaling events and long-term adaptive changes, and it applies across diverse biological contexts, from single cells to whole organisms.
Why Is response to L-ascorbic acid Important in Cell Biology?
The response to L-ascorbic acid is fundamental to human health because vitamin C is an essential nutrient that cannot be synthesized by humans. It influences a myriad of physiological processes, including immune function, collagen synthesis, neurotransmitter production, and iron absorption. Dysregulation of this response is implicated in cancer, where high-dose ascorbate can selectively induce DNA damage in KRAS mutant cells, and in inflammatory conditions such as inflammatory bowel diseases. Moreover, ascorbic acid derivatives are being developed as anticancer and antiallergic agents. Understanding GO:0033591 at the molecular level enables researchers to identify therapeutic targets, optimize nutritional interventions, and design CRISPR-based models to dissect causal genes.
• Vitamin C is an essential micronutrient; its response pathways are critical for antioxidant defense and redox homeostasis.
• L-ascorbic acid serves as a cofactor for Fe(II)/2-oxoglutarate dioxygenases, affecting epigenetic marks and hypoxia signaling.
• High-dose ascorbate preferentially kills KRAS mutant pancreatic cancer cells via DNA damage, offering a precision oncology strategy.
• The response is dose-dependent and hormetic, with SVCT-2 expression determining sensitivity in colorectal cancer cells.
• Ascorbic acid derivatives show antiallergic and anticancer activities, expanding therapeutic applications.
• Inflammatory bowel diseases may benefit from ascorbic acid supplementation due to its anti-inflammatory effects.
• Ascorbic acid biosynthesis intermediates like 2-keto-L-gulonic acid affect plant carbon metabolism and secondary metabolites.
• Ultrasound-responsive thylakoid liposomes can modulate NAD+ biosynthesis and mitochondrial repair in acute kidney injury, linking to ascorbate-related redox pathways.
What Happens During response to L-ascorbic acid?
Uptake and Transport
In simple terms: Cells take up vitamin C through specific transporter proteins.
L-ascorbic acid enters cells primarily via sodium-dependent vitamin C transporters (SVCTs), such as SVCT-2 (SLC23A2). The expression level of SVCT-2 determines the intracellular concentration of ascorbate and modulates the cellular response to the vitamin. In some cell types, dehydroascorbic acid can be taken up by glucose transporters and reduced intracellularly. The uptake step is a prerequisite for downstream signaling and metabolic effects.
Redox Modulation and Antioxidant Activity
In simple terms: Vitamin C neutralizes harmful reactive oxygen species.
Once inside the cell, L-ascorbic acid acts as a potent antioxidant, scavenging reactive oxygen species (ROS) and regenerating other antioxidants such as alpha-tocopherol. This redox modulation can influence signaling pathways, including those involving NF-kB and Nrf2, and protect against oxidative damage. However, at high concentrations, ascorbate can also act as a pro-oxidant, generating hydrogen peroxide and inducing DNA damage in susceptible cancer cells.
Enzymatic Cofactor Functions
In simple terms: Vitamin C helps enzymes that modify proteins and DNA.
L-ascorbic acid is a cofactor for Fe(II)/2-oxoglutarate-dependent dioxygenases, which include prolyl hydroxylases, lysine demethylases, and TET DNA demethylases. These enzymes regulate collagen synthesis, hypoxia-inducible factor (HIF) stability, and epigenetic marks. The response to L-ascorbic acid therefore includes changes in gene expression and post-translational modifications mediated by these enzymes.
DNA Damage and Cell Death Pathways
In simple terms: High doses of vitamin C can damage DNA and kill cancer cells.
In KRAS mutant pancreatic cancer cells, L-ascorbic acid preferentially induces DNA damage, likely through oxidative stress and impaired DNA repair, leading to cell death. This selective cytotoxicity is dependent on the expression of SVCT-2 and the cellular redox environment. The response includes activation of DNA damage response pathways, such as ATM/ATR signaling, and apoptosis.
Modulation of Immune and Inflammatory Responses
In simple terms: Vitamin C can calm inflammation and affect immune cells.
L-ascorbic acid influences immune cell function and inflammatory signaling. It can reduce the production of pro-inflammatory cytokines and modulate the activity of immune cells, which is relevant to conditions like inflammatory bowel diseases. Derivatives of ascorbic acid, such as 6-deoxy-2-O-methyl-6-(N-hexadecanoyl)amino-L-ascorbic acid, have shown antiallergic activity, indicating that the core response can be chemically tuned.
Key Genes Involved in GO:0033591 response to L-ascorbic acid
The following genes and proteins are central to the response to L-ascorbic acid, based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SLC23A2 (SVCT-2) | Sodium-dependent vitamin C transporter | Determines cellular uptake and sensitivity to ascorbate; biomarker in cancer |
| KRAS | GTPase involved in cell signaling | Mutant KRAS sensitizes pancreatic cancer cells to ascorbate-induced DNA damage |
| TET2 | DNA demethylase | Ascorbate-dependent cofactor for TET enzymes; affects epigenetic regulation |
| HIF1A | Hypoxia-inducible factor | Regulated by ascorbate-dependent prolyl hydroxylases |
| COL1A1 | Collagen synthesis | Requires ascorbate for prolyl hydroxylation |
| NFE2L2 (Nrf2) | Antioxidant response transcription factor | Modulated by ascorbate redox status |
| NFKB1 | Inflammatory signaling | Influenced by ascorbate antioxidant activity |
| TP53 | Tumor suppressor | May influence cellular response to ascorbate-induced DNA damage |
| BAX | Apoptosis regulator | Potential mediator of ascorbate-induced cell death |
| CASP3 | Apoptosis executioner | Activated in response to high-dose ascorbate |
| SLC2A1 (GLUT1) | Glucose transporter | Can transport dehydroascorbic acid |
| GULO | L-gulonolactone oxidase | Lost in humans; not applicable to human cells but relevant in animal models |
| SOD1 | Superoxide dismutase | Interacts with ascorbate redox cycling |
| CAT | Catalase | Detoxifies hydrogen peroxide generated by ascorbate |
| GPX1 | Glutathione peroxidase | Works with ascorbate to reduce oxidative stress |
| SLC7A11 | Cystine/glutamate antiporter | Affects glutathione and ascorbate homeostasis |
| AKR1C1 | Aldo-keto reductase | May metabolize ascorbate derivatives |
| TUBB | Tubulin beta | Target of ascorbate derivatives in anticancer activity |
How Is response to L-ascorbic acid Regulated?
The response to L-ascorbic acid is regulated at multiple levels. Uptake is controlled by the expression and activity of SVCT-2 (SLC23A2), which can be modulated by transcription factors and stress conditions. Intracellular ascorbate levels are also influenced by recycling from dehydroascorbic acid and by efflux mechanisms. At the signaling level, ascorbate can modulate the activity of Fe(II)/2-oxoglutarate dioxygenases, which in turn regulate HIF-1alpha stability and epigenetic marks. Redox-sensitive transcription factors such as Nrf2 and NF-kB mediate downstream gene expression changes. Additionally, the hormetic dose response observed in colorectal cancer cells suggests that the magnitude and direction of the response depend on the cellular context and SVCT-2 expression.
response to L-ascorbic acid and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| KRAS | Pancreatic cancer | KRAS mutant pancreatic cancer cell lines (e.g., PANC-1) with CRISPR knockout of KRAS |
| SLC23A2 (SVCT-2) | Colorectal cancer | SVCT-2 knockout and overexpression in HCT116 or SW480 cells |
| TET2 | Epigenetic regulation in cancer | TET2 knockout HEK293T cells treated with ascorbate |
| NFKB1 | Inflammatory bowel diseases | NFKB1 knockout intestinal epithelial cells |
| HIF1A | Hypoxia and cancer | HIF1A knockout cancer cells under ascorbate treatment |
Cancer
L-ascorbic acid exhibits context-dependent effects in cancer. In KRAS mutant pancreatic cancer cells, high-dose ascorbate preferentially induces DNA damage and cell death, suggesting a potential therapeutic strategy for this hard-to-treat malignancy. In colorectal cancer, the response is hormetic: low doses may promote survival, while high doses are cytotoxic, depending on SVCT-2 expression. Ascorbate derivatives have also shown anticancer activity through tubulin polymerization inhibition.
Inflammatory Bowel Diseases
Ascorbic acid has been proposed as a therapeutic adjunct for inflammatory bowel diseases due to its antioxidant and anti-inflammatory properties. It can reduce oxidative stress and modulate cytokine production in the gut mucosa. However, clinical evidence is still emerging, and the optimal dosage and delivery remain under investigation.
Acute Kidney Injury
Ascorbate-related redox pathways are implicated in acute kidney injury. Ultrasound-responsive thylakoid-integrating liposomes have been shown to modulate NAD+ biosynthesis and mitochondrial repair, processes that intersect with ascorbate metabolism. This highlights the broader role of ascorbate in cellular stress responses and tissue repair.
Allergic Disorders
A derivative of L-ascorbic acid, 6-deoxy-2-O-methyl-6-(N-hexadecanoyl)amino-L-ascorbic acid, exhibits antiallergic activity, indicating that the ascorbate response can be harnessed to modulate allergic reactions. This opens avenues for developing ascorbate-based antiallergic agents.
From response to L-ascorbic acid-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does SVCT-2 mediate ascorbate uptake and sensitivity? | SLC23A2 knockout and overexpression cell lines |
| Does mutant KRAS confer sensitivity to ascorbate-induced DNA damage? | Isogenic KRAS wild-type and mutant pancreatic cancer cells |
| What is the role of TET2 in ascorbate-mediated DNA demethylation? | TET2 knockout and catalytically dead knock-in cells |
| How does ascorbate affect inflammatory signaling? | NF-kB reporter cells with CRISPR knockout of NFKB1 |
| Can ascorbate derivatives inhibit tubulin polymerization? | Tubulin polymerization assay with purified tubulin and ascorbate derivatives |
| Does ascorbate modulate mitochondrial repair in kidney injury? | In vivo acute kidney injury models treated with thylakoid liposomes |
How to Study the response to L-ascorbic acid Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Global gene expression changes | Identify pathways altered by ascorbate |
| Proteomics | Protein abundance and modifications | Quantify redox enzymes and DNA repair proteins |
| Metabolomics | Metabolite levels (e.g., ascorbate, glutathione) | Assess redox status and metabolic flux |
| Comet assay | DNA strand breaks | Measure ascorbate-induced DNA damage |
| gamma-H2AX staining | DNA double-strand breaks | Detect DNA damage foci |
| Caspase-3 activity assay | Apoptosis | Quantify cell death after ascorbate treatment |
| CRISPR knockout screening | Gene essentiality and resistance | Identify modulators of ascorbate response |
| Tubulin polymerization assay | Microtubule assembly | Evaluate ascorbate derivatives as anticancer agents |
Transcriptomics and RNA-seq
RNA sequencing can reveal global gene expression changes in response to L-ascorbic acid, identifying pathways such as oxidative stress response, DNA repair, and inflammation. Comparing wild-type and knockout cells (e.g., SLC23A2 or KRAS) helps pinpoint causal genes.
Proteomics and Metabolomics
Mass spectrometry-based proteomics and metabolomics can quantify changes in protein abundance and metabolite levels, including ascorbate itself, glutathione, and NAD+. These methods are useful for understanding redox and metabolic reprogramming.
DNA Damage Assays
Comet assay, gamma-H2AX staining, and apoptosis assays (e.g., caspase-3 activity) are used to measure DNA damage and cell death induced by high-dose ascorbate. These are particularly relevant in cancer cells with specific mutations.
CRISPR Screening
Genome-wide CRISPR knockout screens can identify genes that modulate sensitivity or resistance to L-ascorbic acid. This unbiased approach can uncover novel regulators of GO:0033591.
How CRISPR Can Be Used to Study GO:0033591 response to L-ascorbic acid
Knockout
CRISPR knockout of candidate genes such as SLC23A2, KRAS, or TET2 allows researchers to test their necessity in the response to L-ascorbic acid. For example, SLC23A2 knockout cells show reduced ascorbate uptake and altered sensitivity to ascorbate-induced cytotoxicity. KRAS knockout can reverse the selective sensitivity of mutant pancreatic cancer cells to ascorbate.
Point Mutation
Introducing point mutations (e.g., catalytically inactive TET2 or mutant KRAS) via CRISPR base editing or homology-directed repair can dissect specific domains and residues required for the ascorbate response. This is useful for separating enzymatic cofactor functions from redox effects.
Knock-in
Knock-in of tagged versions of proteins (e.g., GFP-SVCT-2) enables live-cell imaging and localization studies. Knock-in of disease-associated variants can model altered ascorbate responses in patient-derived cells.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can increase the levels of genes like SLC23A2 or antioxidant enzymes to study gain-of-function effects on ascorbate sensitivity and resistance.
How EDITGENE Supports response to L-ascorbic acid Research
Researchers studying response to L-ascorbic acid-related genes often need to determine whether a candidate gene is causally involved in the cellular response to vitamin C. This requires precise genetic models that can isolate the contribution of individual genes from the complex redox and metabolic networks.
Contact EDITGENE today to design your custom CRISPR model for response to L-ascorbic acid research.
Frequently Asked Questions About response to L-ascorbic acid
What is GO:0033591?
GO:0033591 is the Gene Ontology term for 'response to L-ascorbic acid', describing any cellular or organismal change triggered by vitamin C.
What genes are involved in response to L-ascorbic acid?
Key genes include SLC23A2 (SVCT-2), KRAS, TET2, HIF1A, and NFKB1, among others.
How does vitamin C affect cancer cells?
High-dose vitamin C can induce DNA damage and cell death in certain cancer cells, such as KRAS mutant pancreatic cancer, while low doses may be protective.
What is the role of SVCT-2 in vitamin C response?
SVCT-2 (SLC23A2) is the primary transporter for L-ascorbic acid uptake, and its expression determines cellular sensitivity to the vitamin.
Can vitamin C be used to treat inflammatory bowel diseases?
Ascorbic acid has anti-inflammatory and antioxidant properties that may benefit IBD, but clinical evidence is still limited.
What are ascorbic acid derivatives used for?
Derivatives like 6-deoxy-2-O-methyl-6-(N-hexadecanoyl)amino-L-ascorbic acid show antiallergic activity, and sulfonate derivatives have anticancer potential.
How is the response to L-ascorbic acid studied?
Researchers use RNA-seq, proteomics, DNA damage assays, and CRISPR screens to study this response.
What is the hormetic effect of vitamin C?
Hormesis refers to a biphasic dose response where low doses may be beneficial and high doses toxic, observed in colorectal cancer cells based on SVCT-2 expression.
Does vitamin C affect epigenetics?
Yes, L-ascorbic acid is a cofactor for TET enzymes and histone demethylases, influencing DNA and histone methylation.
What CRISPR models are available for studying vitamin C response?
Knockout, point mutation, knock-in, and overexpression models for genes like SLC23A2, KRAS, and TET2 can be generated.
Conclusion
GO:0033591 (response to L-ascorbic acid) is a multifaceted biological process with critical implications for health and disease. From its role in redox homeostasis and enzymatic cofactor functions to its context-dependent effects in cancer and inflammation, understanding this response requires integrated experimental approaches. The literature highlights key genes such as SLC23A2, KRAS, and TET2, and demonstrates the therapeutic potential of ascorbate and its derivatives. CRISPR-based models are indispensable for dissecting causality and identifying novel regulators. As research advances, precise genetic tools will continue to illuminate the mechanisms and translational opportunities of the vitamin C response.
References
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- 2. Miura K et al.. 2021. Antiallergic Activity of 6-Deoxy-2-O-methyl-6-(N-hexadecanoyl)amino-l-ascorbic Acid.. Molecules 26(15) PMID: 34361837
- 3. Jang HL et al.. 2025. L-Ascorbic acid preferentially kills KRAS mutant pancreatic cancer cells through DNA damage.. Sci Rep 15(1):22705 PMID: 40595145
- 4. Lei Y et al.. 2025. NAD(+) biosynthesis and mitochondrial repair in acute kidney injury via ultrasound-responsive thylakoid-integrating liposomes.. Nat Biomed Eng 9(10):1740-1757 PMID: 40461655
- 5. Deshmukh SR et al.. 2024. Design, synthesis, and biological evaluation of novel 2,3-Di-O-Aryl/Alkyl sulfonate derivatives of l-ascorbic acid: Efficient access to novel anticancer agents via in vitro screening, tubulin polymerization inhibition, molecular docking study and ADME predictions.. Bioorg Chem 147:107402 PMID: 38688199
- 6. Cho S et al.. 2018. Hormetic dose response to (L)-ascorbic acid as an anti-cancer drug in colorectal cancer cell lines according to SVCT-2 expression.. Sci Rep 8(1):11372 PMID: 30054560
- 7. Andriolo IRL et al.. 2024. Perspectives About Ascorbic Acid to Treat Inflammatory Bowel Diseases.. Drug Res (Stuttg) 74(4):149-155 PMID: 38467159
- 8. Gao M et al.. 2025. Intervention of 2-keto-L-gulonic acid in L-ascorbic acid biosynthesis affects plant carbon metabolism and secondary metabolite accumulation.. Plant Physiol Biochem 226:110079 PMID: 40441099
