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IMMUNOLOCALIZATION OF H+-ATPase IN THE GILL EPITHELIA OF RAINBOW TROUT
The Journal of Experimental Biology
|January 1, 1994
Summary
Proton pumps (H+-ATPase) are found in the apical regions of rainbow trout gills, aiding sodium uptake in freshwater fish. Their distribution changes with hypercapnic treatment and is absent in seawater-adapted trout gills.
Area of Science:
- Physiology
- Cell Biology
- Biochemistry
Background:
- Proton pumps, specifically H+-ATPase, play crucial roles in ion transport across cell membranes.
- Understanding the localization of these pumps in fish gills is vital for comprehending osmoregulation and ion homeostasis.
Purpose of the Study:
- To elucidate the localization of H+-ATPase in the gill epithelia of rainbow trout (Oncorhynchus mykiss).
- To investigate the impact of hypercapnic conditions on H+-ATPase distribution.
- To determine the type and antigenic similarity of fish gill H+-ATPase.
Main Methods:
- Immunofluorescence microscopy using antibodies against the 70 kDa subunit of H+-ATPase.
- Western blot analysis to confirm the presence of the 70 kDa subunit.
Main Results:
- H+-ATPase was uniformly distributed and concentrated in apical regions of freshwater trout gill epithelia.
- Hypercapnic treatment altered H+-ATPase distribution to a non-polarized pattern in chloride cells.
- No significant staining was observed in seawater-adapted trout gills, except for surface material.
Conclusions:
- H+-ATPase is located in the apex of chloride and epithelial cells in freshwater fish gills, supporting a role in sodium uptake.
- Fish gill H+-ATPase is of the vacuolar type, antigenically similar to mammalian H+-ATPase.
- Environmental factors like salinity and CO2 levels influence H+-ATPase localization in fish gills.