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2015 ; 309
(5
): L463-74
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Fibroblast growth factor signaling in myofibroblasts differs from lipofibroblasts
during alveolar septation in mice
#MMPMID26138642
McGowan SE
; McCoy DM
Am J Physiol Lung Cell Mol Physiol
2015[Sep]; 309
(5
): L463-74
PMID26138642
show ga
Pulmonary alveolar fibroblasts produce extracellular matrix in a temporally and
spatially regulated pattern to yield a durable yet pliable gas-exchange surface.
Proliferation ensures a sufficient complement of cells, but they must
differentiate into functionally distinct subtypes: contractile myofibroblasts
(MF), which generate elastin and regulate air-flow at the alveolar ducts, and, in
mice and rats, lipofibroblasts (LF), which store neutral lipids. PDGF-A is
required but acts in conjunction with other differentiation factors arising from
adjacent epithelia or within fibroblasts. We hypothesized that FGF receptor
(FGFR) expression and function vary for MF and LF and contributes to their
divergent differentiation. Whereas approximately half of the FGFR3 was
extracellular in MF, FGFR2 and FGFR4 were primarily intracellular. Intracellular
FGFR3 localized to the multivesicular body, and its abundance may be modified by
Sprouty and interaction with heat shock protein-90. FGF18 mRNA is more abundant
in MF, whereas FGF10 mRNA predominated in LF, which also express FGFR1 IIIb, a
receptor for FGF10. FGF18 diminished fibroblast proliferation and was chemotactic
for cultured fibroblasts. Although PDGF receptor-? (PDGFR-?) primarily signals
through phosphoinositide 3-kinase and Akt, p42/p44 MAP kinase (Erk1/2), a major
signaling pathway for FGFRs, influenced the abundance of cell-surface PDGFR-?.
Observing different FGFR and ligand profiles in MF and LF is consistent with
their divergent differentiation although both subpopulations express PDGFR-?.
These studies also emphasize the importance of particular cellular locations of
FGFR3 and PDGFR-?, which may modify their effects during alveolar development or
repair.