Journal
DEVELOPMENTAL CELL
Volume 49, Issue 5, Pages 697-+Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2019.03.022
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Funding
- National Key Basic Research Program of China [2015CB942800]
- National Natural Science Foundation of China [91539201, 91739304, 31730060]
- 111 Program [B14037]
- Chongqing Special Postdoctoral Science Foundation [Xm2017022]
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Damage to regional cerebrovascular networks and neuronal tissues occurs during acute cerebrovascular diseases, such as ischemic stroke. The promotion of vascular regeneration is the most promising therapeutic approach. To understand the cellular and molecular mechanisms underlying brain vascular regeneration, we developed two zebrafish cerebrovascular injury models using genetic ablation and photochemical thrombosis. Although brain parenchyma is physiologically devoid of lymphatic vasculature, we found that cerebrovascular injuries induce rapid ingrowth of meningeal lymphatics into the injured parenchyma. The ingrown lymphatics on one hand become lumenized to drain interstitial fluid to resolve brain edema and on the other hand act as growing tracks for nascent blood vessels. The ingrown lymphatic vessels undergo apoptosis and clearance after cerebrovascular regeneration. This study reveals a pathological function of meningeal lymphatics, through previously unexpected ingrowth into brain parenchyma and a newly identified lymphatic function as vascular growing tracks.
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