# Antioxidant-Rich Clitoria ternatea Flower Extract Promotes Proliferation and Migration of Human Corneal Epithelial Cells

## TL;DR

This study shows that Clitoria ternatea flower extract, rich in antioxidants, can help heal corneal wounds by promoting cell growth and migration.

## Contribution

The novel finding is that CTE extract promotes corneal epithelial wound healing by upregulating CK3 and Cx43 in vitro.

## Key findings

- CTE extract at 0.08 mg/mL increased cell viability and wound closure in corneal epithelial cells.
- CTE treatment upregulated CK3 and Cx43 gene and protein expression over time.
- CTE showed antioxidant activity with 33.8% DPPH radical scavenging and high polyphenol content.

## Abstract

A corneal abrasion results from the disruption or loss of cells in the corneal epithelium. If inadequately treated, it can compromise visual clarity. The wound healing process of a corneal abrasion involves epithelial migration, proliferation and adhesion. Clitoria ternatea flower extract (CTE) is rich in flavonoids, anthocyanins and other bioactive compounds. It has antioxidant, anti-inflammatory and wound-healing properties. This study explores the potential of CTE to be used as a natural supplement to improve corneal wound healing. Phytochemical profiling via LC–MS identified a total of 51 distinct bioactive constituents. The anthocyanin content, quantified in terms of cyanidin-3-glucoside equivalent, was quantified at 33.06 mg per gram of extract. The extract exhibited 33.8% DPPH radical scavenging activity and a total polyphenol content equivalent to 24.14 mg/g gallic acid. Human telomerase-immortalized corneal epithelial (hTCEpi) cells maintained in keratinocyte basal medium were utilized to determine cytotoxicity and wound-healing effects. The optimal extract concentration of 0.08 mg/mL, quantified via MTT assay, resulting in enhanced cell viability. Scratch assays demonstrated a higher percentage of wound closure in the CTE-treated group at 6 and 12 h relative to the untreated group, with statistical significance (p < 0.05). The gene expressions of CK3 and Cx43, quantified via qRT-PCR, showed no significant differences between groups. However, within the CTE-treated group, CK3 expression increased at 12 h relative to 0 h and 6 h, and Cx43 expression rose significantly at 12 h compared with 0 h (p < 0.05). Immunofluorescence confirmed positive protein expression of both markers. These findings suggest that CTE possesses potent antioxidant properties and promotes corneal epithelial wound healing through upregulation of CK3 and Cx43 in vitro.