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Immunohistochemical demonstration of Angiopoietin-2 in lymphatic vascular development

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Abstract

The cellular expression of Angiopoietin-2 (Ang2) was studied during lymphatic development in mouse by immunohistochemistry and compared to that of lymphatic endothelial markers. At the earliest stage of lymphvasculogenesis, Prox1-identified lymphatic precursor cells of the cardinal vein displayed an intense immunoreaction for Ang2 in their cytoplasm, implying that Ang2 may adjust lymphatic specification and sprouting from the veins under the control of Prox1. Thereafter, Ang2 was constantly expressed in Prox1 and/or LYVE-1-immunopositive endothelial cells of lymphatic sacs and vessels, ranging from lymphatic capillaries to collectors, throughout embryonic and neonatal development, and the lymphatic endothelial cells simultaneously exhibited immunoreactivity to Tie2, a primary receptor for angiopoietins. These results suggest that lymphatic endothelial cells may regulate lymphatic development via their own Ang2-Tie2 signaling. Ang2 is further immunolocalized in the developing blood vessels including hepatic sinusoids, adrenal medullary vasculature and postnatal pulmonary vessels, thereby indicating that the blood vessels, which undergo vascular remodeling and sudden alteration of blood flow during the development, are also likely to express Ang2. The present study is first to demonstrate Ang2 expression in the lymphatic endothelial cells during development, and consequently Ang2 is regarded as a molecular profile of the developing lymphatic endothelial cells required for lymphatic vascular organization.

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Acknowledgment

The author is grateful to Mr. Tooru Kajiwara for his expert technical assistance.

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Correspondence to Hiroshi Shimoda.

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Shimoda, H. Immunohistochemical demonstration of Angiopoietin-2 in lymphatic vascular development. Histochem Cell Biol 131, 231–238 (2009). https://doi.org/10.1007/s00418-008-0513-9

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