Abstract:
:Inhibition by all-trans retinoic acid (atRA) of the microvasculature formation in chicken chorioallantoic membrane (CAM) accompanied remarkably reduced numbers of endothelial cells (ECs) and increased numbers of mural cells (MCs) under the chorionic epithelial layer. Ro41-5253 (retinoid antagonist) exerted the opposite effect. Although atRA did not affect the differentiation of murine embryonic stem cell-derived vascular progenitor cells (VPCs) into ECs or MCs, atRA suppressed EC-MC interaction, leading to impaired branching. In both atRA-treated VPC cultures and CAM tissues underneath the chorionic epithelial layer, the expression of angiopoietin-2 (Ang-2; competitor for Ang-1) was enhanced, whereas that of Tie2 (a receptor for Angs) was reduced. Simultaneous treatment with Ang-1 partially blocked RA induction of EC-MC malinteraction and reduction in blood vessel formation. These results suggest that retinoid(s) may reduce EC-MC interaction by down-regulating Tie2 signaling as well as decreased EC numbers, which lead to impaired vascular remodeling.
journal_name
Bloodjournal_title
Bloodauthors
Suzuki Y,Komi Y,Ashino H,Yamashita J,Inoue J,Yoshiki A,Eichmann A,Amanuma H,Kojima Sdoi
10.1182/blood-2003-09-3293subject
Has Abstractpub_date
2004-07-01 00:00:00pages
166-9issue
1eissn
0006-4971issn
1528-0020pii
2003-09-3293journal_volume
104pub_type
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