Abstract
Human lymphatic vascular malformations (LMs), also known as cystic hygromas or lymphangioma, consist of multiple lymphatic endothelial cell-lined lymph-containing cysts. No animal model of this disease exists. To develop a mouse xenograft model of human LM, CD34NegCD31Pos LM lymphatic endothelial cells (LM-LEC) were isolated from surgical specimens and compared to foreskin CD34NegCD31Pos lymphatic endothelial cells (LECs). Cells were implanted into a mouse tissue engineering model for 1, 2 and 4 weeks. In vitro LM-LECs showed increased proliferation and survival under starvation conditions (P < 0.0005 at 48 h, two-way ANOVA), increased migration (P < 0.001, two-way ANOVA) and formed fewer (P = 0.029, independent samples t test), shorter tubes (P = 0.029, independent samples t test) than foreskin LECs. In vivo LM-LECs implanted into a Matrigel™-containing mouse chamber model assembled to develop vessels with dilated cystic lumens lined with flat endothelium, morphology similar to that of clinical LMs. Human foreskin LECs failed to survive implantation. In LM-LEC implanted chambers the percent volume of podoplaninPos vessels was 1.18 ± 2.24 % at 1 week, 6.34 ± 2.68 % at 2 weeks and increasing to 7.67 ± 3.60 % at 4 weeks. In conclusion, the significantly increased proliferation, migration, resistance to apoptosis and decreased tubulogenesis of LM-LECs observed in vitro is likely to account for their survival and assembly into stable LM-like structures when implanted into a mouse vascularised chamber model. This in vivo xenograft model will provide the basis of future studies of LM biology and testing of potential pharmacological interventions for patients with lymphatic malformations.
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Acknowledgments
We thank Michelle Marchionna for technical assistance in the early stages of this project. This work was supported by grants from The National Health and Medical Research Council (NHMRC #566886), The Hector Waldron Pride Charitable Trust (EDW, AJP) and The William Buckland Foundation (AJP, MM). EDW was supported by an NHMRC Career Development Award (#519539). The O’Brien Institute and Monash Institute of Medical Research acknowledge support from the Victorian State Government’s Department of Innovation, Industry and Regional Development’s Operational Infrastructure Support Program.
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10456_2013_9371_MOESM1_ESM.tif
Expression of CD34 in the lymphatic malformation human tissue. A CD34 expression is not detected in the lymphatic malformation endothelium (#). CD34 is present on the stromal cells in the connective tissue, in cells residing in tunica adventitia of blood vessels and in the endothelium of blood vessels (arrow). B The absence of CD34 from the lymphatic malformation (#) was further confirmed with double labelling of CD34 and CD31 where co-expression of the two is found in blood vessels only (arrow) (TIFF 40192 kb)
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Deposition of connective tissue in the LM xenograft model. Masson’s trichrome stain labels connective tissue component collagen blue (arrows). A, B Connective tissue in 1 week LEC-implanted mouse chamber at low and high magnification respectively. C, D Connective and adipose tissue in 4-week LEC implanted chambers low and high magnification respectively. Note that collagen is most evident at tissue periphery. E, F Connective tissue in 1 week LM-LEC implanted mouse chamber low and high magnification respectively. G, H Connective and adipose tissue in 4-week LM-LEC implanted chambers at low and high magnification respectively. Arrows point to connective tissue in the vicinity of LM vessels (≠). Host artery (#) and vein (*) are present in the chambers (TIFF 50945 kb)
10456_2013_9371_MOESM3_ESM.tif
Cell Proliferation in LM-LEC implanted chambers. A Ki-67 positive proliferating cells were identified in human lymph node, positive control tissue. B, C, D Rare Ki-67-labelled cells were identified in lymphatic malformation vessels at 4 weeks (*). E Ki67 labelled cells were also identified in the host tissue and F in the vicinity of the LM vessels (*). Note variable degree of Ki-67 staining indicative of cell entry or exit from cell proliferation cycle (TIFF 26008 kb)
10456_2013_9371_MOESM4_ESM.tif
Cell death in LM-LEC implanted chambers. A Cleaved caspase-3 positive cells (arrowheads) were identified in human lymph node, positive control tissue. Note different staining patterns within the lymph node follicle. B Cleaved caspase-3 positive cells (arrowheads) were present at the edge of the chamber tissue at 4 weeks and C in the developing host tissue in 1 and 2-week old chambers. D, E Both LEC and LM-LEC implanted chambers contain dead LEC and LM-LECs in the Matrigel where weak residual caspase-3 staining was observed (arrowheads). Note refractive brown dynabead® in the tissue section shown in E. F Hematoxylin stained apoptotic bodies (arrowheads) were evident in both the LEC and LM-LEC implanted chambers in haematoxylin-eosin stained tissues (TIFF 25329 kb)
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Lokmic, Z., Mitchell, G.M., Koh Wee Chong, N. et al. Isolation of human lymphatic malformation endothelial cells, their in vitro characterization and in vivo survival in a mouse xenograft model. Angiogenesis 17, 1–15 (2014). https://doi.org/10.1007/s10456-013-9371-8
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DOI: https://doi.org/10.1007/s10456-013-9371-8