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Connexin gap junction channels and chronic rhinosinusitis
Raymond Kim1, George Chang2, Rebecca Hu2
1Department of Surgery, The University of Auckland, Auckland, New Zealand.
International Forum of Allergy & Rhinology
|February 27, 2016
Summary
Chronic rhinosinusitis (CRS) involves altered expression of connexin (Cx) proteins in the sinonasal mucosa. This study found elevated levels of Cx26, Cx30, and Cx43 in CRS, suggesting a potential therapeutic target.
Area of Science:
- Cellular Biology
- Molecular Biology
- Immunology
Background:
- Gap junction channels, formed by connexin (Cx) proteins, mediate cell-to-cell communication.
- Certain connexins are implicated in inflammatory processes, including acute and chronic inflammation.
- Chronic rhinosinusitis (CRS) is characterized by inflammatory changes in the sinonasal mucosa.
Purpose of the Study:
- To screen normal sinus mucosa for the expression profile of the connexin gene family.
- To compare the expression levels of Cx26, Cx30, and Cx43 in CRS versus normal sinus mucosa.
- To investigate the association between altered connexin expression and sinonasal inflammation in CRS.
Main Methods:
- Sinonasal mucosa biopsies were obtained from CRS patients and healthy controls.
- Polymerase chain reaction (PCR) was used for initial connexin gene family screening.
- Quantitative real-time PCR (qPCR) and fluorescent immunohistochemistry (IHC) were employed for targeted analysis of Cx26, Cx30, and Cx43.
Main Results:
- Sixteen different connexin genes were expressed in normal sinonasal mucosa.
- Quantitative PCR revealed increased abundance of Cx26 (p = 0.005) and Cx43 (p = 0.04) in CRS mucosa compared to controls.
- Immunohistochemistry confirmed significantly higher Cx43 levels in CRS patients (p < 0.001).
Conclusions:
- The majority of connexin genes are expressed in healthy sinonasal mucosa.
- Expression of Cx26, Cx30, and Cx43 is elevated in the sinonasal mucosa of CRS patients.
- Modulating connexin gap junctions presents a potential novel therapeutic strategy for CRS.
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