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Intravascular pillars and pruning in the extraembryonic vessels of chick embryos
Author(s) -
Lee Grace S.,
Filipovic Nenad,
Lin Miao,
Gibney Barry C.,
Simpson Dinee C.,
Konerding Moritz A.,
Tsuda Akira,
Mentzer Steven J.
Publication year - 2011
Publication title -
developmental dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.634
H-Index - 141
eISSN - 1097-0177
pISSN - 1058-8388
DOI - 10.1002/dvdy.22618
Subject(s) - pruning , reynolds number , biology , anatomy , streamlines, streaklines, and pathlines , shear stress , blood flow , blood vessel , geometry , biomedical engineering , mechanics , mathematics , physics , medicine , engineering , turbulence , agronomy , endocrinology
To investigate the local mechanical forces associated with intravascular pillars and vessel pruning, we studied the conducting vessels in the extraembryonic circulation of the chick embryo. During the development days 13–17, intravascular pillars and blood flow parameters were identified using fluorescent vascular tracers and digital time‐series video reconstructions. The geometry of selected vessels was confirmed by corrosion casting and scanning electron microscopy. Computational simulations of pruning vessels suggested that serial pillars form along pre‐existing velocity streamlines; blood pressure demonstrated no obvious spatial relationship with the intravascular pillars. Modeling a Reynolds number of 0.03 produced 4 pillars at approximately 20‐μm intervals matching the observed periodicity. In contrast, a Reynolds number of 0.06 produced only 2 pillars at approximately 63‐μm intervals. Our modeling data indicated that the combination of wall shear stress and gradient of shear predicted the location, direction, and periodicity of developing pillars. Developmental Dynamics 240:1335–1343, 2011. © 2011 Wiley‐Liss, Inc.