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Fatal bilateral chylothorax in mice lacking the integrin alpha9beta1
X Z Huang1, J F Wu, R Ferrando
1Lung Biology Center, Center for Occupational and Environmental Health, Cardiovascular Research Institute, San Francisco, California 94143-0854, USA.
Molecular and Cellular Biology
|June 24, 2000
Summary
Integrin alpha9 deficiency causes respiratory failure in newborn mice due to lymphatic system defects. This research highlights the critical role of alpha9 integrin in lymphatic development and suggests a link to congenital chylothorax.
Area of Science:
- Cell Biology
- Developmental Biology
- Molecular Biology
Background:
- Integrins are crucial adhesion receptors mediating cell-matrix and cell-cell interactions.
- The integrin alpha9beta1 receptor binds extracellular matrix proteins and cell surface molecules.
- Integrins play vital roles in embryonic development, wound healing, and metastasis.
Purpose of the Study:
- To investigate the in vivo function of the integrin alpha9beta1 receptor.
- To determine the consequences of alpha9 subunit deficiency in a mouse model.
Main Methods:
- Generation of mice lacking the alpha9 integrin subunit (alpha9-/-).
- Observation of phenotype, survival, and physiological parameters in alpha9-/- mice.
- Histological analysis of pleural fluid and chest wall tissues.
Main Results:
- Alpha9-/- mice exhibit respiratory failure and mortality between 6-12 days of age.
- Accumulation of triglyceride-, cholesterol-, and lymphocyte-rich pleural fluid (chylothorax) observed.
- Edema and lymphocytic infiltration around lymphatics in the chest wall noted.
- Transient expression of alpha9 protein in the developing thoracic duct during embryogenesis.
Conclusions:
- The alpha9 integrin is essential for the normal development of the lymphatic system, including the thoracic duct.
- Deficiency in alpha9 integrin may lead to congenital chylothorax.
- This study elucidates a novel function of alpha9 integrin in lymphatic development.