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Published on: August 14, 2013
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Chronic hyperglycemia aggravates lung function in a Scnn1b-Tg murine model.
Guiying Cui1, Dina A Moustafa1, Shilin Zhao2
1Division of Pulmonology, Asthma, Cystic Fibrosis, and Sleep, Department of Pediatrics, Emory + Children's Center for Cystic Fibrosis and Airways Disease Research, Emory University School of Medicine and Children's Healthcare of Atlanta, Atlanta, Georgia, United States.
Summary
Researchers developed a new mouse model for cystic fibrosis-related diabetes (CFRD) using Scnn1b-Tg mice. This model helps study CFRD lung disease and test new treatments for cystic fibrosis (CF).
Area of Science:
- Physiology
- Pathology
- Genetics
Background:
- Cystic fibrosis-related diabetes (CFRD) is a common comorbidity in cystic fibrosis (CF) that worsens lung function and increases mortality.
- Scnn1b-Tg transgenic mice naturally develop CF-like lung disease, including mucus obstruction and inflammation.
Purpose of the Study:
- To establish and characterize a chronic mouse model of CFRD using Scnn1b-Tg mice.
- To investigate the lung pathophysiology associated with CFRD in this model.
Main Methods:
- Scnn1b-Tg mice were made diabetic using streptozotocin (STZ) to create a chronic CFRD-like model.
- Tracheal ion channel activity was assessed using Ussing chamber recordings.
- Blood and bronchoalveolar lavage fluid (BALF) glucose levels were measured.
- Lung histology and RNA sequencing were performed.
- Mice were infected with Pseudomonas aeruginosa to assess response to infection.
Main Results:
- Diabetic Scnn1b-Tg mice exhibited elevated blood and BALF glucose levels.
- Increased neutrophil counts and pro-inflammatory cytokines were observed in the lungs of diabetic Scnn1b-Tg mice.
- Lung histology revealed enhanced parenchymal destruction and inflammation in diabetic Scnn1b-Tg mice.
- The model showed increased susceptibility to Pseudomonas aeruginosa infection.
Conclusions:
- A chronic CFRD-like lung mouse model was successfully established using Scnn1b-Tg mice.
- This model recapitulates key aspects of CFRD lung pathophysiology, including inflammation and infection susceptibility.
- The model provides a valuable tool for studying CFRD mechanisms and developing novel therapeutics for CF lung disease.
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