Abstract
Although bronchial angiogenesis has been well documented in allergic asthma, lymphangiogenesis has not been widely studied. Therefore, we evaluated changes in lung lymphatics in a rat model of allergen-induced asthma using house dust mite (Der p 1; 100 μg/challenge). Additionally, properties of isolated lung lymphatic endothelial cells (CD45−, CD141+, LYVE-1+, Prox-1+) were studied in vitro. Three weeks after the onset of intranasal allergen exposure (twice-weekly), an increase in the number of lung lymphatic vessels was measured (34% increase) by lung morphometry. New lymphatic structures were seen predominantly in the peribronchial and periarterial interstitial space but also surrounding large airways. Isolated lymphatic endothelial cells from sensitized lungs showed enhanced proliferation (% Ki67+), chemotaxis, and tube formation (number and length) compared to lymphatic endothelial cells isolated from naive rat lungs. This hyper-proliferative lymphangiogenic phenotype was preserved through multiple cell passages (2–8). Lymphatic endothelial cells isolated from naive and HDM-sensitized rats produced similar in vitro levels of VEGF-C, VEGF-D, and VEGFR3 protein, each recognized as critical lymphangiogenic factors. Inhibition with anti-VEGFR (axitinib, 0.1 μM) blocked proliferation and chemotaxis. Results suggest that in vivo sensitization causes fundamental changes to lymphatic endothelium, which are retained in vitro, and may relate to VEGFR downstream signaling.
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Funding was provided by National Heart, Lung, and Blood Institute (Grant Nos. HL10342 and HL113392).
Authors’ contributions
A.M. and E.M.W. were involved in conception and design. A.M., J.J., and Q.Z. carried out experimental work. A.M. and E.M.W. performed analysis and interpretation. A.M. and E.M.W. finalized manuscript.
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Supplementary Figure 1
Lymphatic endothelial cells in culture. A. Bright-field exposure showing cobblestone morphology of confluent monolayer; B. anti-LYVE-1+ staining (green), nuclei were counterstained with DAPI (blue) at enhanced magnification; and C. anti-Prox-1+ nuclei. Bar = 50 μm (TIFF 1536 kb)
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Moldobaeva, A., Jenkins, J., Zhong, Q. et al. Lymphangiogenesis in rat asthma model. Angiogenesis 20, 73–84 (2017). https://doi.org/10.1007/s10456-016-9529-2
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DOI: https://doi.org/10.1007/s10456-016-9529-2