Neuropilin-1 and platelet-derived growth factor receptors cooperatively regulate intermediate filaments and mesenchymal cell migration during alveolar septation
| Autor: | Diann M. McCoy, Stephen E. McGowan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Pulmonary and Respiratory Medicine Platelet-derived growth factor Physiology Intermediate Filaments Mice Transgenic Receptor Platelet-Derived Growth Factor beta Mice 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Physiology (medical) Neuropilin 1 Animals Intermediate filament Platelet-Derived Growth Factor Focal Adhesions Cell Biology Nestin Neuropilin-1 Cell biology Pulmonary Alveoli 030104 developmental biology chemistry 030220 oncology & carcinogenesis Desmin Myofibroblast Gene Deletion Mesenchymal cell migration Research Article Signal Transduction Proto-oncogene tyrosine-protein kinase Src |
| Zdroj: | American Journal of Physiology-Lung Cellular and Molecular Physiology. 315:L102-L115 |
| ISSN: | 1522-1504 1040-0605 |
| Popis: | Generation of secondary alveolar septa occurs primarily after birth in humans and is complete in mice postnatally, when mechanical stresses vary as air space pressure oscillates. Alveolar mesenchymal cells deposit elastic fibers, which limit cell strain; although when the elastic fiber network is incomplete, this function is also served by the intracellular cytoskeleton. Intermediate filament proteins support deformation during cell division and migration, which occur during septal elongation. Because platelet-derived growth factor receptor-α (PDGFRα) signaling is essential for alveolar septation, we hypothesized that neuropilin-1 (NRP1) may link PDGFRα to cytoskeletal deformation. During cell migration, NRP1 links receptor tyrosine kinase signaling to cytoskeletal and focal adhesion remodeling. Therefore, we examined the consequences of nrp1 gene deletion in alveolar mesenchymal cells (myofibroblasts and pericytes). NRP1 depletion reduced the proportion of mesenchymal cells that contain nestin and desmin within the subpopulation that lacked PDGFRα but contained PDGFRβ. Desmin was reduced at alveolar entry rings, air spaces were enlarged, and surface area was reduced after NRP1 depletion. PDGFRα and NRP1 colocalized to membrane lipid rafts, which are known to contain Src kinase. NRP1 depletion reduced alveolar mesenchymal cell migration and PDGF-A-mediated activation of Src kinase, which may limit accumulation of desmin at septal tips (alveolar entry rings). Cooperation between NRP1 and PDGF signaling is required for secondary septation, and manipulation of NRP1 could promote alveolar regeneration without producing fibrosis. |
| Databáze: | OpenAIRE |
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