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Related Experiment Videos

Turtle urinary bladder epithelial cell line.

J A Arruda1, H J Lubansky, K Thomasson

  • 1Section of Nephrology, University of Illinois, Chicago.

Comparative Biochemistry and Physiology. A, Comparative Physiology
|January 1, 1989
PubMed
Summary

This study compared a turtle bladder cell line to native epithelial cells to see if the cultured cells retain acidification properties. Researchers found that the cell line shows carbonic anhydrase activity and acetazolamide inhibits O2 consumption and acidification, like in native cells. Acridine orange staining revealed acidic vesicles that dissipated with NH4Cl or protonophores. ATP addition restored granules in permeabilized cells, suggesting H+-ATPase activity is involved. The findings confirm that the cell line can model epithelial acidification, making it a useful tool for further studies.

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Area of Science:

  • Cell biology
  • Comparative physiology
  • Epithelial cell function

Background:

Prior research has shown that turtle bladders contain epithelial cells with unique acidification properties. However, no prior work had resolved whether cell lines derived from these tissues retain the same functional characteristics. Established knowledge includes the role of carbonic anhydrase in epithelial acidification. This gap motivated the current work to assess if cultured cells mirror native tissue behavior. The presence of acidification mechanisms in epithelial cells is well documented. Yet, the persistence of these traits in cell culture remains uncertain. This uncertainty drove the need to test acidification in cultured cells. The study aimed to clarify whether cultured cells maintain essential acidification features.

Purpose Of The Study:

The aim of this study was to evaluate whether a turtle bladder cell line retains acidification properties of native epithelial cells. The specific problem addressed is the functional fidelity of cultured cells compared to primary tissue. Researchers wanted to determine if acidification mechanisms persist in culture. The motivation stems from the need to validate cell lines as models for epithelial function. The study focused on carbonic anhydrase activity and vesicle acidification. The researchers tested if ATP and H+-ATPase activity are preserved in culture. The goal was to confirm if cell lines can replicate in vivo acidification processes. The work aimed to establish a reliable model for further physiological studies.

Keywords:
Turtle bladder cell lineEpithelial acidificationCarbonic anhydrase activityH+-ATPase function

Frequently Asked Questions

Acetazolamide inhibition suggests carbonic anhydrase activity is preserved in the cell line, mirroring native epithelial cells.

Acridine orange staining revealed orange red vesicles, which dissipated with NH4Cl or protonophores, indicating acidic compartments.

Digitonin permeabilized cells to test if ATP addition could restore red granules, suggesting H+-ATPase activity is responsible for vesicle acidification.

H+-ATPase mediates vesicle acidification, as ATP addition led to granule reappearance in permeabilized cells.

Related Experiment Videos

Main Methods:

The study compared enzymatic and functional properties of a turtle bladder cell line to native epithelial cells. Carbonic anhydrase activity was measured in both cell types. Acetazolamide was used to inhibit O2 consumption and acidification. Acridine orange staining identified cytoplasmic vesicles in cultured cells. Vesicle pH was assessed using NH4Cl and protonophores. Digitonin permeabilization was used to test ATP effects on vesicles. H+-ATPase activity was inferred from ATP-induced granule reappearance. The methods focused on functional assays and microscopic analysis.

Main Results:

The cell line showed carbonic anhydrase activity like native epithelial cells. Acetazolamide inhibited O2 consumption in isolated cells and monolayers. Acridine orange revealed orange red vesicles in cultured cells. NH4Cl and protonophores dissipated these vesicles, indicating low pH. ATP addition led to granule reappearance in permeabilized cells. This suggests H+-ATPase mediates vesicle acidification. Vesicle pH is regulated by ATP-dependent mechanisms. The results confirm that cultured cells retain acidification traits of native tissue.

Conclusions:

The authors found that the cell line retains acidification properties of native epithelial cells. Carbonic anhydrase activity and acetazolamide inhibition were preserved. Vesicle acidification was confirmed through staining and ATP experiments. The presence of H+-ATPase activity was supported by ATP-induced granule reappearance. The study suggests that cultured cells can model epithelial acidification. The findings align with prior knowledge of epithelial function. The results support the use of this cell line for further physiological studies. The authors propose that this model retains essential acidification mechanisms.

Carbonic anhydrase activity supports acidification processes, as acetazolamide inhibited O2 consumption in both isolated cells and monolayers.

The cell line retains acidification traits of native tissue, confirming its utility as a model for epithelial function.