The anti-oxidative role of ABCG2 in corneal epithelial cells

Miyuki Kubota, Shigeto Shimmura, Hideyuki Miyashita, Motoko Kawashima, Tetsuya Kawakita, Kazuo Tsubota

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

PURPOSE. ABCG2 is a putative marker of progenitor cells, including the corneal epithelium. The authors investigated whether ABCG2 functions in the homeostasis of corneal epithelial cells using abcg2 knockout (KO) mice and corneal epithelial cell lines. METHODS. abcg2 KO mice and a spontaneously immortalized murine corneal epithelial cell line (TKE2) were used for experiments. Flow cytometry was used to determine the presence of side population (SP) cells based on the ability of ABCG2 to efflux Hoechst 33342 dye. Expression of ABCG2 was also examined by RT-PCR. Cytotoxicity assay (IC 50) and propidium iodide staining were performed in semiconfluent cells treated with hypoxia (1% O 2) or with the pro-oxidant mitoxantrone. RESULTS. abcg2 KO mice had a normal corneal epithelial phenotype; however, cultured abcg2 KO epithelial cells were prone to oxidative damage by mitoxantrone. TKE2 cells were resistant to mitoxantrone at low doses, but higher concentrations were toxic in a dose-dependent manner. Coculture with the ABCG2 inhibitors reserpine and Ko143 inhibited resistance to mitoxantrone, with a statistically higher cell death ratio. abcg2 KO cells were also significantly more sensitive to hypoxia than were wild-type control cells. CONCLUSIONS. ABCG2 may protect corneal epithelial progenitor SP cells against oxidative stress induced by toxins and hypoxia.

Original languageEnglish
Pages (from-to)5617-5622
Number of pages6
JournalInvestigative Ophthalmology and Visual Science
Volume51
Issue number11
DOIs
Publication statusPublished - 2010 Nov

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Mitoxantrone
Side-Population Cells
Epithelial Cells
Knockout Mice
Stem Cells
Cell Line
Corneal Epithelium
Propidium
Poisons
Reserpine
Coculture Techniques
Reactive Oxygen Species
Flow Cytometry
Oxidative Stress
Homeostasis
Cell Death
Coloring Agents
Staining and Labeling
Phenotype
Polymerase Chain Reaction

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

The anti-oxidative role of ABCG2 in corneal epithelial cells. / Kubota, Miyuki; Shimmura, Shigeto; Miyashita, Hideyuki; Kawashima, Motoko; Kawakita, Tetsuya; Tsubota, Kazuo.

In: Investigative Ophthalmology and Visual Science, Vol. 51, No. 11, 11.2010, p. 5617-5622.

Research output: Contribution to journalArticle

Kubota, Miyuki ; Shimmura, Shigeto ; Miyashita, Hideyuki ; Kawashima, Motoko ; Kawakita, Tetsuya ; Tsubota, Kazuo. / The anti-oxidative role of ABCG2 in corneal epithelial cells. In: Investigative Ophthalmology and Visual Science. 2010 ; Vol. 51, No. 11. pp. 5617-5622.
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