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2014 ; 115
(8
): 709-20
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gab.com Text
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English Wikipedia
FOXF1 transcription factor is required for formation of embryonic vasculature by
regulating VEGF signaling in endothelial cells
#MMPMID25091710
Ren X
; Ustiyan V
; Pradhan A
; Cai Y
; Havrilak JA
; Bolte CS
; Shannon JM
; Kalin TV
; Kalinichenko VV
Circ Res
2014[Sep]; 115
(8
): 709-20
PMID25091710
show ga
RATIONALE: Inactivating mutations in the Forkhead Box transcription factor F1
(FOXF1) gene locus are frequently found in patients with alveolar capillary
dysplasia with misalignment of pulmonary veins, a lethal congenital disorder,
which is characterized by severe abnormalities in the respiratory,
cardiovascular, and gastrointestinal systems. In mice, haploinsufficiency of the
Foxf1 gene causes alveolar capillary dysplasia and developmental defects in lung,
intestinal, and gall bladder morphogenesis. OBJECTIVE: Although FOXF1 is
expressed in multiple mesenchyme-derived cell types, cellular origins and
molecular mechanisms of developmental abnormalities in FOXF1-deficient mice and
patients with alveolar capillary dysplasia with misalignment of pulmonary veins
remain uncharacterized because of lack of mouse models with cell-restricted
inactivation of the Foxf1 gene. In the present study, the role of FOXF1 in
endothelial cells was examined using a conditional knockout approach. METHODS AND
RESULTS: A novel mouse line harboring Foxf1-floxed alleles was generated by
homologous recombination. Tie2-Cre and Pdgfb-CreER transgenes were used to delete
Foxf1 from endothelial cells. FOXF1-deficient embryos exhibited embryonic
lethality, growth retardation, polyhydramnios, cardiac ventricular hypoplasia,
and vascular abnormalities in the lung, placenta, yolk sac, and retina. Deletion
of FOXF1 from endothelial cells reduced endothelial proliferation, increased
apoptosis, inhibited vascular endothelial growth factor signaling, and decreased
expression of endothelial genes critical for vascular development, including
vascular endothelial growth factor receptors Flt1 and Flk1, Pdgfb, Pecam1, CD34,
integrin ?3, ephrin B2, Tie2, and the noncoding RNA Fendrr. Chromatin
immunoprecipitation assay demonstrated that Flt1, Flk1, Pdgfb, Pecam1, and Tie2
genes are direct transcriptional targets of FOXF1. CONCLUSIONS: FOXF1 is required
for the formation of embryonic vasculature by regulating endothelial genes
critical for vascular development and vascular endothelial growth factor
signaling.