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ADH-induced depolymerization of F-actin in the toad bladder granular cell: a confocal microscope study.
K Holmgren1, K E Magnusson, N Franki
1Department of Medical Microbiology, Faculty of Health Sciences, University of Linköping, Sweden.
The American Journal of Physiology
|March 1, 1992
Summary
Antidiuretic hormone (ADH) triggers actin depolymerization in toad bladder cells. This actin depolymerization occurs at the cell apex, facilitating vesicle fusion and water channel insertion.
Area of Science:
- Cell Biology
- Membrane Biology
- Physiology
Background:
- Antidiuretic hormone (ADH) regulates water reabsorption in the kidney and bladder.
- ADH signaling involves the insertion of aquaporin water channels into the apical membrane of epithelial cells.
- F-actin cytoskeleton dynamics are implicated in membrane trafficking events.
Purpose of the Study:
- To investigate the specific cellular location of F-actin depolymerization induced by ADH.
- To determine if actin depolymerization is associated with the apical region where vesicle fusion occurs.
Main Methods:
- Confocal microscopy was used to visualize F-actin distribution in toad bladder granular cells.
- Rhodamine phalloidin staining was employed to label F-actin.
- Quantitative analysis of fluorescence intensity in apical and lateral cell regions was performed.
Main Results:
- ADH stimulation led to a significant decrease in the ratio of apical to lateral F-actin fluorescence intensity.
- The observed actin depolymerization was localized to the apical region of the granular cells.
- A 30% depolymerization of F-actin was quantified, consistent with previous findings.
Conclusions:
- Actin depolymerization induced by ADH occurs in the apical cellular domain.
- This localized actin depolymerization is spatially correlated with the site of vesicle fusion.
- These findings support the hypothesis that actin depolymerization is a prerequisite for hormone-induced vesicle fusion.