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Platelet-Derived Growth Factor-D Enables Liver Myofibroblasts to Promote Tumor Lymphangiogenesis in Cholangiocarcinoma


Cadamuro, Massimiliano; Brivio, Simone; Mertens, Joachim; Vismara, Marta; Moncsek, Anja; Milani, Chiara; Fingas, Christian; Cristina Malerba, Maria; Nardo, Giorgia; Dall'Olmo, Luigi; Milani, Eleonora; Mariotti, Valeria; Stecca, Tommaso; Massani, Marco; Spirli, Carlo; Fiorotto, Romina; Indraccolo, Stefano; Strazzabosco, Mario; Fabris, Luca (2019). Platelet-Derived Growth Factor-D Enables Liver Myofibroblasts to Promote Tumor Lymphangiogenesis in Cholangiocarcinoma. Journal of Hepatology, 70(4):700-709.

Abstract

BACKGROUND /Aims. In cholangiocarcinoma, early metastatic spread via lymphatic vessels often precludes curative therapies. Cholangiocarcinoma invasiveness is fostered by an extensive stromal reaction, enriched in cancer-associated fibroblasts (CAF) and lymphatic endothelial cells (LEC). Cholangiocarcinoma cells recruit and activate CAF by secreting PDGF-D. Here we investigated the role of PDGF-D and liver myofibroblasts in promoting lymphangiogenesis in cholangiocarcinoma. METHODS Human cholangiocarcinoma specimens were immunostained for podoplanin (LEC marker), α-SMA (CAF), VEGF-A, VEGF-C, and their cognate receptors (VEGFR2, VEGFR3). VEGF-A and VEGF-C secretion (ELISA) was evaluated in human fibroblasts obtained from primary sclerosing cholangitis explants stimulated by PDGF-D, with/without the PDGFRβ inhibitor imatinib. Using human LEC incubated with conditioned medium from PDGF-D-stimulated fibroblasts (with/without imatinib), we assessed migration (Boyden chambers), 3-D vascular assembly (AngioTool), trans-endothelial electric resistance and trans-endothelial migration of cholangiocarcinoma cells (EGI-1). In Fischer-344 rats transplanted with a syngeneic cholangiocarcinoma cell line, we studied effects of selective CAF depletion induced by the BH3 mimetic navitoclax on LEC density and lymphnode metastases. RESULTS In cholangiocarcinoma specimens, CAF and LEC were closely adjacent. CAF expressed VEGF-A and VEGF-C, while LEC expressed VEGFR2 and VEGFR3. Upon PDGF-D stimulation, fibroblasts secreted increased levels of VEGF-C and VEGF-A. Fibroblasts, stimulated by PDGF-D induced LEC recruitment and 3-D assembly, increased LEC monolayer permeability, and promoted trans-endothelial EGI-1 migration. These effects were all suppressed by imatinib. In the rat model of cholangiocarcinoma, navitoclax-induced CAF depletion markedly reduced lymphatic vascularization and lymphnode metastases. CONCLUSION PDGF-D stimulates VEGF-C and VEGF-A production by fibroblasts, resulting in expansion of the lymphatic vasculature and tumor cell intravasation. This process critical for the early metastatization of cholangiocarcinoma, may be blocked by inducing CAF apoptosis or by inhibiting PDGF-D-induced axis. LAY SUMMARY Cholangiocarcinoma (CCA) is a highly malignant cancer affecting the biliary tree. In CCA, a rich stromal reaction densely populated by cancer-associated fibroblasts promotes early metastatic spread. Here we show that CCA-derived PDGF-D recruiting fibroblasts, also stimulates them to secrete VEGF-A and VEGF-C. These vascular growth factors kindle both lymphatic vascularization and tumour cell vascular invasion. Thus, targeting fibroblasts or PDGF-D-induced signals may represent an effective tool to block tumor-associated lymphangiogenesis and reduce CCA invasiveness.

Abstract

BACKGROUND /Aims. In cholangiocarcinoma, early metastatic spread via lymphatic vessels often precludes curative therapies. Cholangiocarcinoma invasiveness is fostered by an extensive stromal reaction, enriched in cancer-associated fibroblasts (CAF) and lymphatic endothelial cells (LEC). Cholangiocarcinoma cells recruit and activate CAF by secreting PDGF-D. Here we investigated the role of PDGF-D and liver myofibroblasts in promoting lymphangiogenesis in cholangiocarcinoma. METHODS Human cholangiocarcinoma specimens were immunostained for podoplanin (LEC marker), α-SMA (CAF), VEGF-A, VEGF-C, and their cognate receptors (VEGFR2, VEGFR3). VEGF-A and VEGF-C secretion (ELISA) was evaluated in human fibroblasts obtained from primary sclerosing cholangitis explants stimulated by PDGF-D, with/without the PDGFRβ inhibitor imatinib. Using human LEC incubated with conditioned medium from PDGF-D-stimulated fibroblasts (with/without imatinib), we assessed migration (Boyden chambers), 3-D vascular assembly (AngioTool), trans-endothelial electric resistance and trans-endothelial migration of cholangiocarcinoma cells (EGI-1). In Fischer-344 rats transplanted with a syngeneic cholangiocarcinoma cell line, we studied effects of selective CAF depletion induced by the BH3 mimetic navitoclax on LEC density and lymphnode metastases. RESULTS In cholangiocarcinoma specimens, CAF and LEC were closely adjacent. CAF expressed VEGF-A and VEGF-C, while LEC expressed VEGFR2 and VEGFR3. Upon PDGF-D stimulation, fibroblasts secreted increased levels of VEGF-C and VEGF-A. Fibroblasts, stimulated by PDGF-D induced LEC recruitment and 3-D assembly, increased LEC monolayer permeability, and promoted trans-endothelial EGI-1 migration. These effects were all suppressed by imatinib. In the rat model of cholangiocarcinoma, navitoclax-induced CAF depletion markedly reduced lymphatic vascularization and lymphnode metastases. CONCLUSION PDGF-D stimulates VEGF-C and VEGF-A production by fibroblasts, resulting in expansion of the lymphatic vasculature and tumor cell intravasation. This process critical for the early metastatization of cholangiocarcinoma, may be blocked by inducing CAF apoptosis or by inhibiting PDGF-D-induced axis. LAY SUMMARY Cholangiocarcinoma (CCA) is a highly malignant cancer affecting the biliary tree. In CCA, a rich stromal reaction densely populated by cancer-associated fibroblasts promotes early metastatic spread. Here we show that CCA-derived PDGF-D recruiting fibroblasts, also stimulates them to secrete VEGF-A and VEGF-C. These vascular growth factors kindle both lymphatic vascularization and tumour cell vascular invasion. Thus, targeting fibroblasts or PDGF-D-induced signals may represent an effective tool to block tumor-associated lymphangiogenesis and reduce CCA invasiveness.

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Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Gastroenterology and Hepatology
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:1 April 2019
Deposited On:24 Jan 2019 09:19
Last Modified:25 Sep 2019 00:06
Publisher:Elsevier
ISSN:0168-8278
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.jhep.2018.12.004
PubMed ID:30553841

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