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Isolation and Culture of Pulmonary Endothelial Cells from Neonatal Mice
Published on: December 14, 2010
Selenoprotein N deficiency in mice is associated with abnormal lung development
Behzad Moghadaszadeh1, Branden E Rider, Michael W Lawlor
1Division of Genetics, The Manton Center for Orphan Disease Research, Boston Children's Hospital, Boston, MA 02115, USA.
Summary
SEPN1 gene mutations cause myopathy. Sepn1-knockout mice show subtle muscle damage under stress and abnormal lung development, suggesting a primary pulmonary role in respiratory issues.
Area of Science:
- Biochemistry
- Genetics
- Physiology
Background:
- SEPN1 gene mutations lead to SEPN1-related myopathy (SEPN1-RM), causing muscle weakness and respiratory problems.
- Selenoprotein N (SepN) incorporates selenium as selenocysteine (Sec), common in redox-active selenoproteins.
- The precise function of SepN, particularly in muscle and lung, remains incompletely understood.
Purpose of the Study:
- To create and characterize a mouse model for SEPN1-related myopathy.
- To investigate the role of SepN in muscle function and oxidative stress response.
- To examine the impact of SepN deficiency on lung development and respiratory mechanics.
Main Methods:
- Generation of Sepn1-knockout (Sepn1(-/-)) mice.
- Assessment of muscle histology under baseline and induced oxidative stress conditions.
- Evaluation of ryanodine receptor (RyR) sensitivity to caffeine in SepN-deficient myofibers.
- Analysis of lung development and respiratory mechanics (elastance, compliance) in Sepn1(-/-) mice.
Main Results:
- Sepn1(-/-) mice exhibit normal baseline phenotype but develop subtle skeletal muscle lesions upon oxidative stress.
- SepN deficiency reduces the sensitivity of RyR calcium channels to caffeine.
- Sepn1(-/-) mice display abnormal lung development with enlarged alveoli, decreased tissue elastance, and increased quasi-static compliance.
Conclusions:
- The Sepn1-knockout mouse model provides insights into SEPN1-related myopathy.
- SepN may play a role in regulating RyR calcium channels and protecting against oxidative stress in muscle.
- SepN deficiency can directly impact lung development, suggesting a primary pulmonary component in the respiratory syndrome associated with SEPN1 mutations.
