ArticleCurrent eye research2015
Functional characterization and molecular identification of vitamin C transporter (SVCT2) in human corneal epithelial (HCEC) and retinal pigment epithelial (D407) cells.
Article in Current eye research, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 15 citations in OpenAlex.
- Topical Ocular Drug Delivery: The Impact of Permeation Enhancers.Pharmaceutics · 2025Review
- Vitamin C alleviates hyperglycemic stress in retinal pigment epithelial cells.Molecular biology reports · 2024Article
- Ultraviolet B radiation induces oxidative stress and apoptosis in human lens epithelium cells by activating NF-κB signaling to down-regulate sodium vitamin C transporter 2 (SVCT2) expression.Cell cycle (Georgetown, Tex.) · 2023Article
- Expression Profiling of Ascorbic Acid-Related Transporters in Human and Mouse Eyes.Investigative ophthalmology & visual science · 2016Article
- Interaction Studies of Resolvin E1 Analog (RX-10045) with Efflux Transporters.Journal of ocular pharmacology and therapeutics : the official journal of the Association for Ocular Pharmacology and Therapeutics · 2015Article
- Topical, Aqueous, Clear Cyclosporine Formulation Design for Anterior and Posterior Ocular Delivery.Translational vision science & technology · 2015Article
Corrections and comments
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Authors and funding
5 authors at 2 institutions in 1 country.
Funding
Abstract
purposeThe main goal of this study is to investigate the existence of sodium-dependent vitamin C transport system (SVCT2) and to define time-dependent uptake mechanism and intracellular regulation of ascorbic acid (AA) in human corneal epithelial (HCEC) and human retinal pigment epithelial (D407) cells.
methodsUptake of [(14)C] AA was studied in HCEC and D407 cells. Functional aspects of [(14)C] AA uptake were studied in the presence of different concentrations of unlabeled AA, pH, temperature, metabolic inhibitors, substrates and structural analogs. Molecular identification of SVCT2 was examined with reverse transcription-polymerase chain reaction (RT-PCR).
resultsUptake of [(14)C] AA was observed to be sodium, chloride, temperature, pH and energy-dependent in both cell lines. [(14)C] AA uptake was found to be saturable, with Km values of 46.14 ± 6.03 and 47.26 ± 3.24 μM and Vmax values of 17.34 ± 0.58 and 31.86 ± 0.56 pmol/min/mg protein, across HCEC and D407 cells, respectively. The process is inhibited by structural analogs (L-AA and D-Iso AA) but not by structurally unrelated substrates (glucose and PAHA). Ca(++)/calmodulin and protein kinase pathways play an important role in modulating uptake of AA. A 626 bp band corresponding to a vitamin C transporter (SVCT2) has been identified by RT-PCR analysis in both the cell lines.
conclusionThis research article reports regarding the ascorbic acid uptake mechanism, kinetics and regulation by sodium dependent vitamin C transporter (SVCT2) in HCEC and D407 cells. Also, SVCT2 can be utilized for targeted delivery in enhancing ocular permeation and bioavailability of highly potent ophthalmic drugs.
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