Discontinuous LYVE-1 expression in corneal limbal lymphatics: Dual function as microvalves and immunological hot spots

Shintaro Nakao, Souska Zandi, Sepideh Faez, Ri Ichiro Kohno, Ali Hafezi-Moghadam

研究成果: ジャーナルへの寄稿学術誌査読

20 被引用数 (Scopus)

抄録

LYVE-1+ corneal lymphatics contribute to drainage and immunity. LYVE-1 is widely accepted as the most reliable lymphatic marker because of its continuous expression in lymphatic endothelium. LYVE-1 expression in corneal lymphatics has not been examined. In this study, we report intact CD31 + corneal lymphatic capillary endothelial cells that do not express LYVE-1. The number of LYVE-1- gaps initially increased until 8 wk of age but was significantly reduced in aged mice. C57BL/6 mice showed a notably higher number of the LYVE-1-/CD31+ lymphatic regions than BALB/c mice, which suggests a genetic predisposition for this histological feature. The LYVE-1- lymphatic gaps expressed podoplanin and VE-cadherin but not αSMA or FOXC2. Interestingly, the number of LYVE-1- gaps in FGF-2, but not VEGF-A, implanted corneas was significantly lower than in untreated corneas. Over 70% of the CD45+ leukocytes were found in the proximity of the LYVE-1- gaps. Using a novel in vivo imaging technique for visualization of leukocyte migration into and out of corneal stroma, we showed reentry of extravasated leukocytes from angiogenic vessels into newly grown corneal lymphatics. This process was inhibited by VE-cadherin blockade. To date, existence of lymphatic valves in cornea is unknown. Electron microscopy showed overlapping lymphatic endothelial ends, reminiscent of microvalves in corneal lymphatics. This work introduces a novel corneal endothelial lymphatic phenotype that lacks LYVE-1. LYVE-1 - lymphatic endothelium could serve as microvalves, supporting unidirectional flow, as well as immunological hot spots that facilitate reentry of stromal macropahges.

本文言語英語
ページ(範囲)808-817
ページ数10
ジャーナルFASEB Journal
26
2
DOI
出版ステータス出版済み - 2月 2012
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 生化学
  • 分子生物学
  • 遺伝学

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