ZnUMBA - a live imaging method to detect local barrier breaches

Area of Science:

• Cell Biology
• Developmental Biology
• Biophysics

Background:

• Epithelial barrier integrity is crucial for tissue homeostasis.
• Current methods like transepithelial electrical resistance lack sensitivity for local breaches.
• Detecting transient or localized leaks requires higher spatiotemporal resolution.

Purpose of the Study:

• To present expanded applications of the zinc-based ultrasensitive microscopic barrier assay (ZnUMBA).
• To demonstrate ZnUMBA's utility in various biological models for assessing epithelial barrier function.
• To highlight ZnUMBA's capability in measuring dynamic barrier changes with precision.

Main Methods:

• Development of the zinc-based ultrasensitive microscopic barrier assay (ZnUMBA).
• Application of ZnUMBA in Xenopus embryos to study barrier restoration post-laser injury.
• Utilization of ZnUMBA in zebrafish embryos and Madin-Darby canine kidney (MDCK) II cell monolayers.

Main Results:

• ZnUMBA successfully detects local tight junction leaks with high spatiotemporal resolution.
• The assay visualizes barrier restoration dynamics and actin accumulation in Xenopus embryos.
• ZnUMBA proves effective across diverse models, including developing embryos and cultured cells.

Conclusions:

• ZnUMBA is a powerful and flexible method for analyzing epithelial barrier function.
• The assay overcomes limitations of traditional methods by providing precise localization and timing of barrier breaches.
• ZnUMBA requires minimal optimization for application in multiple biological systems to study dynamic barrier changes.