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Corneal epithelial cellular dysfunction from benzalkonium chloride (BAC) in vitro
Seung-Heon Cha1, Jong-Soo Lee, Boo-Sup Oum
1Department of Neurosurgery, College of Medicine, Pusan National University, Pusan, Korea.
Clinical & Experimental Ophthalmology
|April 8, 2004
Summary
Benzalkonium chloride (BAC) can harm corneal epithelial cells, causing damage and dysfunction. Even low concentrations used frequently or for over 30 minutes pose a risk to the corneal epithelial barrier.
Area of Science:
- Ophthalmology
- Cell Biology
- Toxicology
Background:
- Benzalkonium chloride (BAC) is a common preservative in ophthalmic solutions.
- Its potential toxicity to ocular surface cells is a significant concern for eye health.
Purpose of the Study:
- To evaluate the in vitro functional and morphological toxicity of benzalkonium chloride (BAC) on corneal epithelial cells.
- To determine the dose-dependent and time-dependent effects of BAC exposure.
Main Methods:
- Primary rabbit corneal epithelial cells were exposed to various BAC concentrations (0.001% to 0.1%) for different durations (5 to 60 minutes).
- Cell lysis was measured by 51Cr release, cell dysfunction by detachment, and morphological damage by transmission electron microscopy.
Main Results:
- BAC exposure significantly increased corneal epithelial cell lysis in a dose- and time-dependent manner.
- Severe damage occurred at BAC concentrations >0.05% for 5 minutes; dysfunction was noted at 0.005% for 30 minutes.
- Cytoplasmic damage and disrupted cell membranes were observed with prolonged exposure and higher BAC concentrations.
Conclusions:
- Benzalkonium chloride induces corneal epithelial dysfunction and damages the corneal epithelial barrier.
- Frequent use or exposure exceeding 30 minutes, even at low BAC concentrations (0.001%), can compromise corneal integrity.