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Calcium secretion in canine tracheal mucosa
Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 1, 1985
Summary
Canine tracheal mucosa actively secretes calcium (Ca), a process influenced by epinephrine and transepithelial potential. This calcium transport is crucial for respiratory tract homeostasis and mucus properties.
Area of Science:
- Respiratory physiology
- Cellular biology
- Ion transport
Background:
- Calcium (Ca) plays a vital role in numerous cellular functions within the respiratory tract mucosa.
- Altered calcium homeostasis may impact the viscoelastic properties of mucus, affecting airway clearance.
Purpose of the Study:
- To investigate calcium (Ca) homeostasis in the respiratory epithelium.
- To determine the transport mechanisms of Ca across the canine tracheal mucosa.
Main Methods:
- Canine tracheal mucosal tissues were mounted in Ussing-type chambers for precise ion flux measurements.
- Unidirectional fluxes of radioactive calcium-45 (45Ca) were quantified under short-circuit and open-circuit conditions.
- The effects of metabolic inhibitors (2,4-dinitrophenol), epinephrine, and ouabain on Ca transport were assessed.
Main Results:
- A significant net secretion of Ca (1.82 neq·cm⁻²·h⁻¹) was observed under short-circuit conditions.
- Net Ca secretion increased substantially under open-circuit conditions (4.40 neq·cm⁻²·h⁻¹), mimicking in vivo electrical potential differences.
- Epinephrine significantly enhanced Ca secretion, while 2,4-dinitrophenol slightly reduced unidirectional Ca movement.
Conclusions:
- Canine tracheal mucosa actively secretes calcium (Ca).
- This secretory process is modulated by epinephrine and the transepithelial potential difference.
- Understanding Ca transport is key to respiratory tract mucosal function and mucus properties.