I-TEP: A Simple and Affordable Method to Measure Permeability in Reconstructed Tissues Combined with DAMO-TSC-Based...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Analytical Chemistry

Background:

• Trans-epithelial permeability is crucial for genitourinary tissue engineering to prevent leakage.
• Conventional Franz diffusion cells are expensive and inaccessible for routine use.
• Accurate urea quantification in culture media is challenging due to protein interference and assay costs.

Purpose of the Study:

• To develop a low-cost, accessible system for measuring trans-epithelial permeability.
• To optimize a colorimetric urea assay for reliable quantification in complex media.
• To validate a combined system for assessing engineered genitourinary tissues.

Main Methods:

• Developed the Inexpensive Trans-Epithelial Permeability (I-TEP) system using readily available lab components.
• Optimized the diacetyl monoxime-thiosemicarbazide (DAMO-TSC) urea assay, including deproteinization and serum interference studies.
• Correlated I-TEP measurements with Franz diffusion cells using engineered tissue samples.

Main Results:

• The I-TEP test demonstrated strong correlation with conventional Franz diffusion cells.
• Optimized DAMO-TSC assay provided accurate urea quantification, with deproteinization identified as essential.
• The combined method successfully assessed permeability in engineered genitourinary tissues, reflecting maturation and composition.

Conclusions:

• The I-TEP test combined with the optimized DAMO-TSC assay offers an affordable, robust alternative for permeability assessment.
• This protocol addresses the need for routine, high-throughput permeability testing in tissue engineering.
• The system is suitable for evaluating engineered genitourinary tissues and bridging the gap between research and clinical needs.