Related Experiment Videos
Active chloride transport in the pigmented rabbit conjunctiva
U B Kompella1, K J Kim, V H Lee
1Department of Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles 90033.
Current Eye Research
|December 1, 1993
Summary
The pigmented rabbit conjunctiva acts as a tight barrier, actively transporting chloride ions. This study identifies specific ion transport pathways involved in this crucial ocular function.
Area of Science:
- Ophthalmology
- Physiology
- Molecular Biology
Background:
- The conjunctiva forms a protective barrier in the eye.
- Understanding its ion transport mechanisms is vital for ocular health and drug delivery.
Purpose of the Study:
- To investigate the ion transport properties of the excised pigmented rabbit conjunctiva.
- To identify the specific ion channels and transporters involved in transepithelial ion movement.
Main Methods:
- Excised pigmented rabbit conjunctiva mounted in Ussing chambers.
- Measurement of transepithelial potential difference, short-circuit current, and transconjunctival resistance.
- Application of various ion transport inhibitors (ouabain, amiloride, N-phenylanthranilic acid, bumetanide, BaCl2).
Main Results:
- The conjunctiva demonstrated a significant transepithelial potential difference and short-circuit current, indicating active transport.
- A chloride conductive pathway exists on the mucosal side.
- Na+/K+-ATPase, Na+-(K+)-Cl- cotransport, and K+ conductive pathways are present on the serosal side.
- Amiloride-sensitive Na+ pathways were not detected.
Conclusions:
- The pigmented rabbit conjunctiva functions as a tight barrier with active chloride transport capabilities.
- Specific ion transport mechanisms, including chloride channels and basolateral transporters, are crucial for conjunctival function.