Abstract:
:Molecular mechanisms regulating the remodeling of the lymphatic vasculature from an immature plexus of vessels to a hierarchal network of initial and collecting lymphatics are not well understood. One gene thought to be important for this process is Angiopoietin-2 (Ang-2). Ang2(-/-) mice have previously been reported to exhibit an abnormal lymphatic phenotype but the precise nature of the lymphatic defects and the underlying mechanisms have yet to be defined. Here we demonstrate by whole-mount immunofluorescence staining of ear skin and mesentery that lymphatic vessels in Ang2(-/-) mice fail to mature and do not exhibit a collecting vessel phenotype. Furthermore, dermal lymphatic vessels in Ang2(-/-) pups prematurely recruit smooth muscle cells and do not undergo proper postnatal remodeling. In contrast, Ang2 knock-out Ang1 knock-in mice do develop a hierarchal lymphatic vasculature, suggesting that activation of Tie-2 is required for normal lymphatic development. Taken together, this work pinpoints a specific lymphatic defect of Ang2(-/-) mice and further defines the sequential steps in lymphatic vessel remodeling.
journal_name
Dev Bioljournal_title
Developmental biologyauthors
Dellinger M,Hunter R,Bernas M,Gale N,Yancopoulos G,Erickson R,Witte Mdoi
10.1016/j.ydbio.2008.04.024subject
Has Abstractpub_date
2008-07-15 00:00:00pages
309-20issue
2eissn
0012-1606issn
1095-564Xpii
S0012-1606(08)00311-4journal_volume
319pub_type
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