Carotid Body AT4 Receptor Expression and its Upregulation in Chronic Hypoxia
Author Information
Author(s): Fung Man-Lung, Lam Siu-Yin, Wong Tung-Po, Tjong Yung-Wui, Leung Po-Sing
Primary Institution: University of Hong Kong
Hypothesis
Ang IV-binding angiotensin AT4 receptors play a role in the adaptive change of the carotid body in hypoxia.
Conclusion
Chronic hypoxia induces an upregulation of AT4 receptors in the carotid body, enhancing the Ang IV-induced calcium response in glomus cells.
Supporting Evidence
- Ang IV-binding sites and AT4 receptors were more intense in chronically hypoxic rats compared to normoxic controls.
- The protein level of AT4 receptor was doubled in chronically hypoxic rats.
- Exogenous Ang IV elevated intracellular calcium levels significantly more in glomus cells from hypoxic rats.
Takeaway
When rats are in low oxygen for a long time, their bodies make more special receptors that help them sense oxygen levels better.
Methodology
The study involved histochemistry, immunohistochemistry, Western blot analysis, and spectrofluorimetric measurement of calcium levels in glomus cells from rat carotid bodies.
Limitations
The study primarily focused on rat models, which may not fully represent human physiology.
Participant Demographics
One-month-old Sprague-Dawley rats were used in the study.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website