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Relation between pH regulation and iodide transport in turtle thyroid glands
S Y Chow1, D M Woodbury, Y C Yen-Chow
1Department of Physiology, University of Utah School of Medicine, Salt Lake City 84108.
The Journal of Endocrinology
|October 1, 1990
Summary
Turtle thyroid cells regulate pH using distinct mechanisms. Alkalinization recovery involves chloride-bicarbonate exchange, while acidification recovery utilizes sodium-hydrogen exchange, indicating complex cellular pH control.
Area of Science:
- Physiology
- Cell Biology
- Endocrinology
Background:
- Cellular pH homeostasis is crucial for thyroid function.
- Understanding ion transport mechanisms is key to thyroid physiology.
Purpose of the Study:
- To investigate the mechanisms of pH recovery in turtle thyroid slices after alkalinization and acidification.
- To elucidate the roles of specific ion transporters in thyroid pH regulation.
Main Methods:
- Turtle thyroid slices were exposed to ammonium chloride (NH4Cl) or carbon dioxide (CO2) to induce pH changes.
- The effects of transport inhibitors (amiloride, SITS, frusemide, acetazolamide) and altered ion concentrations (Na+, Cl-) were examined.
- Radioisotope tracers (125I-, 22Na+, 36Cl-) were used to study ion uptake.
Main Results:
- pH recovery from alkalinization was inhibited by SITS and low chloride, suggesting Cl-/HCO3- exchange.
- pH recovery from acidification was attenuated by amiloride and low sodium, indicating Na+/H+ exchange.
- Frusemide and acetazolamide affected pH recovery, suggesting additional regulatory pathways.
Conclusions:
- Turtle thyroid gland pH recovery involves distinct Cl-/HCO3- and Na+/H+ exchange mechanisms.
- Other transport systems may also contribute to thyroid pH regulation.
- These findings provide insights into the complex ion transport processes in the thyroid gland.