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Hsp47 Promotes Cancer Metastasis by Enhancing Collagen-Dependent Cancer Cell-Platelet Interaction

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Hsp47 Promotes Cancer Metastasis by Enhancing Collagen-Dependent Cancer Cell-Platelet Interaction Hsp47 promotes cancer metastasis by enhancing collagen-dependent cancer cell-platelet interaction Gaofeng Xionga,b, Jie Chena,b, Guoying Zhangc, Shike Wanga,b, Kunito Kawasakid, Jieqing Zhua,b, Yan Zhangc, Kazuhiro Nagatad, Zhenyu Lic, Binhua P. Zhoua,e, and Ren Xua,b,1 aMarkey Cancer Center, University of Kentucky, Lexington, KY 40536; bDepartment of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, KY 40536; cDivision of Cardiovascular Medicine, Department of Internal Medicine, University of Kentucky, Lexington, KY 40536; dDepartment of Molecular and Cellular Biology, Kyoto Sangyo University, Kyoto 603-8555, Japan; and eDepartment of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536 Edited by Joan S. Brugge, Harvard Medical School, Boston, MA, and approved January 8, 2020 (received for review July 11, 2019) Increased expression of extracellular matrix (ECM) proteins in cell recolonization at the distal sites; however, the exact function circulating tumor cells (CTCs) suggests potential function of cancer of mesenchymal phenotypes in CTCs remains to be determined. cell-produced ECM in initiation of cancer cell colonization. Here, we ECM is a determinant in the tumor microenvironment that showed that collagen and heat shock protein 47 (Hsp47), a chaperone controls cancer development and progression (13, 14). Stromal facilitating collagen secretion and deposition, were highly expressed cells, such as cancer associate fibroblasts (CAFs), are considered during the epithelial-mesenchymal transition (EMT) and in CTCs. the major source of ECM in tumor tissue; interestingly, cancer Hsp47 expression induced mesenchymal phenotypes in mammary cells also deposit a significant quantity of ECM proteins (15–20). epithelial cells (MECs), enhanced platelet recruitment, and promoted Cancer cell-produced ECM molecules, such as tenascin-C, are lung retention and colonization of cancer cells. Platelet depletion the important components of metastatic niches and facilitate in vivo abolished Hsp47-induced cancer cell retention in the lung, cancer cell colonization during metastasis (15, 18, 19). We re- suggesting that Hsp47 promotes cancer cell colonization by enhanc- cently identified heat shock protein 47 (Hsp47) as a hub of the ing cancer cell–platelet interaction. Using rescue experiments and ECM transcription network (20, 21). Binding of Hsp47 to col- functional blocking antibodies, we identified type I collagen as the lagen facilitates collagen secretion and deposition (22). The key mediator of Hsp47-induced cancer cell–platelet interaction. We Hsp47 gene locates at 11q13, a region often amplified in cancer also found that Hsp47-dependent collagen deposition and platelet (23). In addition, increased Hsp47 expression is associated with MEDICAL SCIENCES recruitment facilitated cancer cell clustering and extravasation advanced cancer stage, shortened recurrence-free survival, and in vitro. By analyzing DNA/RNA sequencing data generated from metastasis (20, 24). This evidence suggests that Hsp47 may human breast cancer tissues, we showed that gene amplification contribute to cancer progression. and increased expression of Hsp47 were associated with cancer In this study, we show that expression of Hsp47 and collagen metastasis. These results suggest that targeting the Hsp47/collagen are induced during the EMT. Hsp47 expression enhances cancer axis is a promising strategy to block cancer cell–platelet interaction cell–platelet interaction by inducing collagen deposition in breast and cancer colonization in secondary organs. cancer cells and subsequently promotes cancer cell clustering and colonization at distant sites. These results reveal the molec- extracellular matrix | cancer metastasis | epithelial-mesenchymal ular mechanism by which the EMT enhances cancer cell–platelet transition | breast cancer | circulating tumor cell Significance etastasis is the cause of 90% of cancer-related deaths in Mbreast cancer patients (1). Therefore, understanding how Cancer cell–platelet interaction is crucial for cancer metastasis; cancer cells spread and colonize distant organs is crucial for however, how this interaction is regulated remains largely identifying novel strategies to halt cancer progression and im- unknown. We have identified Hsp47 as an EMT inducer and prove cancer treatment. Cancer metastasis is a multistep process showed that Hsp47 and its dependent collagen secretion en- involved in detachment from the primary tumor, survival in cir- hanced cancer cell–platelet interaction. Importantly, Hsp47- culation, colonization, and formation of macrometastases in induced cancer cell–platelet interaction enhanced cancer cell secondary organs (2). Once cancer cells enter the circulation clustering, which is crucial for cancer cell colonization at distant system, they encounter a variety of environmental stressors, such sites. We also found that Hsp47 gene amplification and ex- as detachment from the extracellular matrix (ECM) substrate, pression were associated with breast cancer metastasis. These shear force, oxidative stress, and attack from immune cells (3, 4). results reveal a link between the Hsp47/collagen axis and Only a small number of cancer cells can survive in circulation platelet recruitment, and provide additional insight into how and establish metastasis lesions (5, 6). How circulating tumor mesenchymal phenotypes in cancer cells contribute to breast cells (CTCs) overcome environmental stress and initiate this cancer metastasis. colonization is not clearly understood. The epithelial-mesenchymal transition (EMT) is an important Author contributions: G.X. and R.X. designed research; G.X., J.C., G.Z., S.W., J.Z., Y.Z., Z.L., and R.X. performed research; K.K. and K.N. contributed new reagents/analytic tools; G.X., cellular event that contributes to cancer metastasis (7, 8). The J.C., G.Z., Z.L., B.P.Z., and R.X. analyzed data; and G.X. and R.X. wrote the paper. EMT process, characterized by the loss of epithelial characteristics The authors declare no competing interest. and acquisition of mesenchymal phenotypes, is induced by a This article is a PNAS Direct Submission. number of cytokine and transcription factors, including trans- β This open access article is distributed under Creative Commons Attribution-NonCommercial- forming growth factor (TGF)- , Twist, Snail, and Slug, during NoDerivatives License 4.0 (CC BY-NC-ND). tumor progression (9). The EMT enhances cancer cell migration Data deposition: Microarray data have been deposited in the Gene Expression Omnibus and invasion and also promotes cancer cell colonization at distant (GEO) database, https://www.ncbi.nlm.nih.gov/geo (accession no GSE143349). organs (9, 10). Single-cell sequencing data has demonstrated that 1To whom correspondence may be addressed. Email: [email protected]. CTCs exhibit increased expression of EMT-related genes (11, 12). This article contains supporting information online at https://www.pnas.org/lookup/suppl/ It has been proposed that activation of the EMT program doi:10.1073/pnas.1911951117/-/DCSupplemental. enhances cancer cell survival in circulation and facilitates cancer www.pnas.org/cgi/doi/10.1073/pnas.1911951117 PNAS Latest Articles | 1of11 Downloaded by guest on October 2, 2021 interaction, and identifies a previously unreported function of the and COL4A1, were up-regulated in CTCs (Fig. 2 A and B). We Hsp47/collagen axis in breast cancer metastasis. asked whether Hsp47 expression contributes to cancer cell coloni- zation and metastasis. Control and Hsp47-silenced MDA-MB-231/ Results luc cells (SI Appendix,Fig.S2A and B) were injected via tail vein Hsp47 Expression Promotes the EMT and Cancer Cell Stemness. ECM into female mice with severe combined immunodeficiency (SCID). remodeling is necessary for cancer development and progression In vivo imaging system (IVIS) analysis and hematoxylin and eosin (13, 14). We previously identified an ECM transcriptional net- (H&E) staining results showed that Hsp47 expression was required work in human breast cancer tissues, the expression of which is for breast cancer cell colonization in the lung and other organs (Fig. induced during cancer development (20). Hsp47, one hub of the 2 C–E and SI Appendix,Fig.S2C). Using the 4T1 orthotopic ECM network, promotes tumor invasion and collagen deposition mammary tumor model, we confirmed that silencing Hsp47 sig- in the xenograft model (20). The EMT is accompanied by ECM nificantly suppressed breast cancer metastasis (Fig. 2 F and G and remodeling and cell invasion; therefore, we asked whether expres- SI Appendix,Fig.S2D). sion of Hsp47 and ECM network genes are associated with the To understand how the EMT and Hsp47 expression contribute EMT process. By analyzing gene expression profiles generated from to CTC colonization, we injected control, Twist-expressing, and mammary epithelial cells (MECs) that had undergone the EMT Hsp47-expressing MCF10A/green fluorescent (GFP) cells in tail (Twist- or Snail-induced), we found that ECM network genes, such veins and analyzed retention of the GFP-positive cells in lungs at as COL1A1, COL1A2, and COL4A1, were induced during the 4 h after injection. We found that Twist-induced EMT signifi- EMT process (Fig. 1A). Transcription and protein expression of cantly enhanced MCF10A cell adhesion in lungs (Fig. 2 H and I). Hsp47 were also significantly increased in Twist- or Snail-induced Expression of Hsp47 also promoted adhesion of MCF10A cells in EMT cells (Fig. 1 B–D and SI Appendix,Fig.S1A–C).
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