1
|
Song J, Shao L, Yu H, Meng C, Li G. Self-Assembly of Sulfate-Containing Peptides Sequesters VEGF for Inhibiting Cancer Cell Invasion. Biomacromolecules 2024; 25:3087-3097. [PMID: 38584438 DOI: 10.1021/acs.biomac.4c00168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Heparan sulfate proteoglycans (HSPGs) play a crucial role in regulating cancer growth and migration by mediating interactions with growth factors. In this study, we developed a self-assembling peptide (S1) containing a sulfate group to simulate the contiguous sulfated regions (S-domains) in heparan sulfate for growth factor binding, aiming to sequester growth factors like VEGF. Spectral and structural studies as well as simulation studies suggested that S1 self-assembled into nanostructures similar to the heparan sulfate chains and effectively bound to VEGF. On cancer cell surfaces, S1 self-assemblies sequestered VEGF, leading to a reduction in VEGF levels in the medium, consequently inhibiting cancer cell growth, invasion, and angiogenesis. This study highlights the potential of self-assembling peptides to emulate extracellular matrix functions, offering insights for future cancer therapeutic strategies.
Collapse
Affiliation(s)
- Jiaqi Song
- Department of Biophysics, School of Basic Medical Sciences, Health Science Centre, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P. R. China
| | - Liang Shao
- Department of Biophysics, School of Basic Medical Sciences, Health Science Centre, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P. R. China
- Department of Biotherapy, Cancer Center and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Hongwen Yu
- Department of Biophysics, School of Basic Medical Sciences, Health Science Centre, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P. R. China
| | - Caiting Meng
- Department of Biophysics, School of Basic Medical Sciences, Health Science Centre, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P. R. China
| | - Guanying Li
- Department of Biophysics, School of Basic Medical Sciences, Health Science Centre, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P. R. China
- The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710004, P. R. China
| |
Collapse
|
2
|
Li J, Wang X, Li Z, Li M, Zheng X, Zheng D, Wang Y, Xi M. SULF1 Activates the VEGFR2/PI3K/AKT Pathway to Promote the Development of Cervical Cancer. Curr Cancer Drug Targets 2024; 24:820-834. [PMID: 37539927 DOI: 10.2174/1568009623666230804161607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 06/14/2023] [Accepted: 06/23/2023] [Indexed: 08/05/2023]
Abstract
BACKGROUND AND PURPOSE Sulfatase 1 (SULF1) can regulate the binding of numerous signaling molecules by removing 6-O-sulfate from heparan sulfate proteoglycans (HSPGs) to affect numerous physiological and pathological processes. Our research aimed to investigate the effect of the SULF1-mediated VEGFR2/PI3K/AKT signaling pathway on tumorigenesis and development of cervical cancer (CC). METHODS The expression and prognostic values of SULF1 in patients with CC were analyzed through bioinformatics analysis, qRT-PCR, immunohistochemistry, and western blot. The function and regulatory mechanism of SULF1 in proliferation, migration, and invasion of cervical cancer cells were examined through lentivirus transduction, CCK8, flow cytometry analysis, plate colony formation assay, scratch assay, transwell assay, western blot, VEGFR2 inhibitor (Ki8751), and mouse models. RESULTS SULF1 expression was significantly upregulated in CC tissues, which was significantly associated with poor prognosis of patients with CC. In vitro, the upregulation of SULF1 expression in HeLa cells promoted cell proliferation, colony formation, migration, and invasion while inhibiting apoptosis. Conversely, the downregulation of SULF1 expression had the opposite effect. In vivo, the upregulation of SULF1 expression resulted in a significant increase in both tumor growth and angiogenesis, while its downregulation had the opposite effect. Furthermore, western blot detection and cell function rescue assay confirmed that the upregulation of SULF1 in HeLa cells promoted the tumorigenic behaviors of cancer cells by activating the VEGFR2/PI3K/AKT signaling pathway. CONCLUSION SULF1 plays an oncogenic role in the tumorigenesis and development of CC, indicating its potential as a novel molecular target for gene-targeted therapy in patients with CC.
Collapse
Affiliation(s)
- Juan Li
- Department of Gynecology and Obstetrics, Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
- Department of Diagnosis and Treatment for Cervical Diseases, Chengdu Women's and Children's Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Xihao Wang
- Department of Pathology, Chengdu Women's and Children's Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Zhilong Li
- Laboratory of Molecular Translational Medicine, Center for Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Minzhen Li
- Department of Gynecology and Obstetrics, Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Xuelian Zheng
- Department of Gynecology and Obstetrics, Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Danxi Zheng
- Department of Gynecology and Obstetrics, Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Yanyun Wang
- Laboratory of Molecular Translational Medicine, Center for Translational Medicine, Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Mingrong Xi
- Department of Gynecology and Obstetrics, Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, 610041, Sichuan, China
| |
Collapse
|
3
|
Guo L, Wei B, Pan F, Wulan H, Cai M. Effects of dual-gene modification on biological characteristics of vascular endothelial cells and their significance as reserving cells for chronic wound repair. Growth Factors 2022; 40:221-230. [PMID: 36083236 DOI: 10.1080/08977194.2022.2118119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
bFGF is a commonly used and reliable factor for improving chronic wound healing, and hSulf-1 expression is abundant in surrounding cells of chronic wound tissue and vascular endothelial cells, which can reverse the effect of bFGF and inhibit the signalling activity of cell proliferation. In this study, an adenovirus, Ad5F35ET1-bFGF-shSulf1, was designed for establishing the dual-gene modified vascular endothelial cells, which were used as the repair cells for skin chronic wound. Ad5F35ET1-bFGF-shSulf1 infected ECV304 cells in vitro and mediated the overexpression of bFGF and the knockdown of hSulf-1, which effectively activated the AKT and ERK signal transduction pathways, facilitate cell proliferation and migration, with the cell viability to 128.29% at 72 h after infection, compared to 66.65%, 73.74%, 87.63%, 103.14% in the blank control, Ad5F35ET1-EGFP-shNC, Ad5F35ET1-shSulf1, Ad5F35ET1-bFGF groups, respectively. In the rat ear skin injury model, the wound healing was significantly accelerated in the Ad5F35ET1-rbFGF-shrSulf1 group compared to the blank control group (p = 0.0046), Ad5F35ET1-EGFP-shNC group (p = 0.0245), Ad5F35ET1-shrSulf group (p = 0.0426), and Ad5F35ET1-rbFGF group (p = 0.2853). The results demonstrated that this strategy may be a candidate therapy for chronic injury repair.
Collapse
Affiliation(s)
- Lingli Guo
- Department of Plastic Surgery, the First Medical Center, Chinese PLA General Hospital, Beijing, China
| | - Baohua Wei
- Department of Plastic Surgery, the First Medical Center, Chinese PLA General Hospital, Beijing, China
| | - Feng Pan
- Department of Plastic Surgery, the First Medical Center, Chinese PLA General Hospital, Beijing, China
| | - Hasi Wulan
- Department of Plastic Surgery, the First Medical Center, Chinese PLA General Hospital, Beijing, China
| | - Mi Cai
- Department of Plastic Surgery, the First Medical Center, Chinese PLA General Hospital, Beijing, China
| |
Collapse
|
4
|
Ji W, Peng Z, Sun B, Chen L, Zhang Q, Guo M, Su C. LpCat1 Promotes Malignant Transformation of Hepatocellular Carcinoma Cells by Directly Suppressing STAT1. Front Oncol 2021; 11:678714. [PMID: 34178664 PMCID: PMC8220817 DOI: 10.3389/fonc.2021.678714] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/18/2021] [Indexed: 01/17/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is a malignant cancer with rapid proliferation and high metastasis ability. To explore the crucial genes that maintain the aggressive behaviors of cancer cells is very important for clinical gene therapy of HCC. LpCat1 was reported to be highly expressed and exert pro-tumorigenic effect in a variety of cancers, including HCC. However, its detailed molecular mechanism remained unclear. In this study, we confirmed that LpCat1 was up-regulated in HCC tissues and cancer cell lines. The overexpressed LpCat1 promoted the proliferation, migration and invasion of HCC cells, and accelerated cell cycle progression, while knocking down LpCat1 significantly inhibited cell proliferation, migration and invasion in vitro and in vivo, and arrested HCC cells at G0/G1 phase. Moreover, we proved for the first time that LpCat1 directly interacted with STAT1 which was generally recognized as a tumor suppressor in HCC. High levels of LpCat1 in HCC could inhibit STAT1 expression, up-regulate CyclinD1, CyclinE, CDK4 and MMP-9, and decrease p27kip1 to promote cancer progression. Conversely, down-regulation of LpCat1 would cause the opposite changes to repress the viability and motility of HCC cells. Consequently, we concluded that LpCat1 was a contributor to progression and metastasis of HCC by interacting with STAT1.
Collapse
Affiliation(s)
- Weidan Ji
- Department of Molecular Oncology, Eastern Hepatobiliary Surgical Hospital & National Centre for Liver Cancer, Navy Military Medical University, Shanghai, China
| | - Zhangxiao Peng
- Department of Molecular Oncology, Eastern Hepatobiliary Surgical Hospital & National Centre for Liver Cancer, Navy Military Medical University, Shanghai, China
| | - Bin Sun
- Department of Molecular Oncology, Eastern Hepatobiliary Surgical Hospital & National Centre for Liver Cancer, Navy Military Medical University, Shanghai, China
| | - Lei Chen
- Department of Molecular Oncology, Eastern Hepatobiliary Surgical Hospital & National Centre for Liver Cancer, Navy Military Medical University, Shanghai, China
| | - Qin Zhang
- Department of Molecular Oncology, Eastern Hepatobiliary Surgical Hospital & National Centre for Liver Cancer, Navy Military Medical University, Shanghai, China
| | - Minggao Guo
- Department of General Surgery, Shanghai Sixth People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Changqing Su
- Department of Molecular Oncology, Eastern Hepatobiliary Surgical Hospital & National Centre for Liver Cancer, Navy Military Medical University, Shanghai, China
| |
Collapse
|
5
|
Zeng F, Liu Y, Ouyang Q, Sun Z, Zhang K, Li X, Liu Y. Rs3802278 in 3'-UTR of SULF1 associated with platinum resistance and survival in Chinese epithelial ovarian cancer patients. J Chemother 2021; 33:564-569. [PMID: 34029511 DOI: 10.1080/1120009x.2021.1913702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Ovarian cancer is the leading cause of death from gynecologic cancers, but platinum resistance remains a major obstacle in the chemotherapy of ovarian cancer. This study aims to examine the role of polymorphisms in sulfatase 1 (SULF1) in platinum resistance and survival in advanced epithelial ovarian cancer (EOC) patients. We genotyped 12 SNPs of SULF1 in 195 EOC patients treated with platinum using MassARRAY method and evaluated the association between the SNPs and platinum response. SULF1 rs3802278 was marginal significantly associated with platinum resistance in recessive model with p value of 0.055. The patients with SULF1 rs3802278 AA were more resistant to platinum-based chemotherapy comparing to those with AG/GG genotype (OR: 2.317, 95%CI: 0.982 ∼ 5.465). In survival analysis, rs3802278 was significantly associated with both of PFS and OS after adjusted by FIGO stage and age. Patients with AA genotypes showed a shorter PFS and OS than with AG/GG genotypes (median PFS: 15 months vs. 21 months, p = 0.010, HR = 1.876, 95%CI: 1.165-3.022; median OS: 42 months vs. 73 months, p = 0.031, HR = 1.928, 95%CI: 1.061-3.504). SULF1 rs3802278 may serve as a potential candidate biomarker for the prediction of platinum resistance and prognosis in Chinese EOC patients.
Collapse
Affiliation(s)
- Feiyue Zeng
- Department of Radiology, Xiangya Hospital, Central South University, Changsha, Hunan, P. R. China
| | - Yujie Liu
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, Hunan, P. R. China.,Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, Hunan, P. R. China.,Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, Hunan, P. R. China.,National Clinical Research Center for Geriatric Disorders, Changsha, Hunan, P. R. China
| | - Qianying Ouyang
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, Hunan, P. R. China.,Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, Hunan, P. R. China.,Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, Hunan, P. R. China.,National Clinical Research Center for Geriatric Disorders, Changsha, Hunan, P. R. China
| | - Zeen Sun
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, Hunan, P. R. China.,Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, Hunan, P. R. China.,Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, Hunan, P. R. China.,National Clinical Research Center for Geriatric Disorders, Changsha, Hunan, P. R. China
| | - Keqiang Zhang
- Hunan Provincial Tumor Hospital, The Affiliated Tumor Hospital of Xiangya Medical School of Central South University, Changsha, Hunan, P. R. China
| | - Xi Li
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, Hunan, P. R. China.,Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, Hunan, P. R. China.,Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, Hunan, P. R. China.,National Clinical Research Center for Geriatric Disorders, Changsha, Hunan, P. R. China
| | - Yingzi Liu
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, Hunan, P. R. China.,Institute of Clinical Pharmacology, Central South University, Hunan Key Laboratory of Pharmacogenetics, Changsha, Hunan, P. R. China.,Engineering Research Center of Applied Technology of Pharmacogenomics, Ministry of Education, Changsha, Hunan, P. R. China.,National Clinical Research Center for Geriatric Disorders, Changsha, Hunan, P. R. China
| |
Collapse
|
6
|
Heparan Sulfate Proteoglycan Signaling in Tumor Microenvironment. Int J Mol Sci 2020; 21:ijms21186588. [PMID: 32916872 PMCID: PMC7554799 DOI: 10.3390/ijms21186588] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/04/2020] [Accepted: 09/08/2020] [Indexed: 12/18/2022] Open
Abstract
In the last few decades, heparan sulfate (HS) proteoglycans (HSPGs) have been an intriguing subject of study for their complex structural characteristics, their finely regulated biosynthetic machinery, and the wide range of functions they perform in living organisms from development to adulthood. From these studies, key roles of HSPGs in tumor initiation and progression have emerged, so that they are currently being explored as potential biomarkers and therapeutic targets for cancers. The multifaceted nature of HSPG structure/activity translates in their capacity to act either as inhibitors or promoters of tumor growth and invasion depending on the tumor type. Deregulation of HSPGs resulting in malignancy may be due to either their abnormal expression levels or changes in their structure and functions as a result of the altered activity of their biosynthetic or remodeling enzymes. Indeed, in the tumor microenvironment, HSPGs undergo structural alterations, through the shedding of proteoglycan ectodomain from the cell surface or the fragmentation and/or desulfation of HS chains, affecting HSPG function with significant impact on the molecular interactions between cancer cells and their microenvironment, and tumor cell behavior. Here, we overview the structural and functional features of HSPGs and their signaling in the tumor environment which contributes to tumorigenesis and cancer progression.
Collapse
|
7
|
Ang L, Guo L, Wang J, Huang J, Lou X, Zhao M. Oncolytic virotherapy armed with an engineered interfering lncRNA exhibits antitumor activity by blocking the epithelial mesenchymal transition in triple-negative breast cancer. Cancer Lett 2020; 479:42-53. [PMID: 32200038 DOI: 10.1016/j.canlet.2020.03.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 02/23/2020] [Accepted: 03/14/2020] [Indexed: 12/14/2022]
Abstract
Triple-negative breast cancer (TNBC) has special characteristics of significant aggressiveness, and strong potential for metastasis and recurrence; currently there are no targeted drugs for TNBC. Abnormal activation of epithelial-mesenchymal transition (EMT) plays an important role in these malignant behaviors of TNBC. In the crosstalk among the multiple EMT-associated signaling pathways, many miRNAs participate in regulating pathway activity, where they act as "traffic lights" at the intersection of these pathways. In this study, we used miRNA microarray technology to detect differentially expressed miRNAs related to EMT in TNBC, and we identified and verified 9 highly expressed oncogenic miRNAs (OncomiRs). High expression of these OncomiRs in clinical breast cancer tissues affected the prognosis of patients, and inhibition of their expression blocked EMT in TNBC cell lines and suppressed cancer cell proliferation and migration. We constructed an oncolytic adenovirus (AdSVP-lncRNAi9) armed with an artificially-designed interfering lncRNA (lncRNAi9), which exhibited an activity to block EMT in TNBC cells by disrupting the functions of multiple OncomiRs; the efficacy of such a treatment for TNBC was demonstrated in cytology and animal experiments. This research provides a new candidate oncolytic virotherapy for treating highly malignant refractory TNBC.
Collapse
Affiliation(s)
- Lin Ang
- Department of Pathology, The Second People's Hospital of Hefei, Hefei, 230011, Anhui, China
| | - Lingli Guo
- Department of Reconstructive Surgery, PLA General Hospital, Beijing, 100853, China
| | - Jin Wang
- Department of Pathology, The Second People's Hospital of Hefei, Hefei, 230011, Anhui, China
| | - Jin Huang
- Department of Pathology, The Second People's Hospital of Hefei, Hefei, 230011, Anhui, China
| | - Xiaoli Lou
- Department of Reconstructive Surgery, Changhai Hospital, Navy Military Medical University, Shanghai, 200433, China.
| | - Min Zhao
- Department of Pathology, The Second People's Hospital of Hefei, Hefei, 230011, Anhui, China.
| |
Collapse
|
8
|
Liu CH, Lan CT, Chou JF, Tseng TJ, Liao WC. CHSY1 promotes aggressive phenotypes of hepatocellular carcinoma cells via activation of the hedgehog signaling pathway. Cancer Lett 2017; 403:280-288. [PMID: 28652022 DOI: 10.1016/j.canlet.2017.06.023] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 06/14/2017] [Accepted: 06/16/2017] [Indexed: 12/29/2022]
Abstract
Abnormal expression of chondroitin sulfate has been found in many types of cancer, while its biological functions in hepatocellular carcinoma (HCC) progression remain uninvestigated. Here, we report that chondroitin sulfate synthase 1 (CHSY1), the enzyme that mediates the polymerization step of chondroitin sulfate, is a critical mediator of malignant character in HCC that acts via modulating the activity of the hedgehog signaling. CHSY1 was up-regulated frequently in HCC where these events were associated with worse histologic grade and poor survival. Enforced expression of CHSY1 was sufficient to enhance cell growth, migration, invasion, and epithelial-mesenchymal transition, whereas silencing of CHSY1 suppressed these malignant phenotypes. Mechanistic investigations revealed that the increase of cell surface chondroitin sulfate by CHSY1 promoted sonic hedgehog binding and signaling. Inhibiting hedgehog pathway with vismodegib decreased CHSY1-induced migration, invasion, and lung metastasis of HCC cells, establishing the critical role of hedgehog signaling in mediating the effects of CHSY1 expression. Together, our results indicate that CHSY1 overexpression in HCC contributes to the malignant behaviors in cancer cells, we provide novel insights into the significance of chondroitin sulfate in hedgehog signaling and HCC pathogenesis.
Collapse
Affiliation(s)
- Chiung-Hui Liu
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan; Department of Medical Education, Chung Shan Medical University Hospital, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan
| | - Chyn-Tair Lan
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan; Department of Medical Education, Chung Shan Medical University Hospital, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan
| | - Jui-Feng Chou
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan
| | - To-Jung Tseng
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan; Department of Medical Education, Chung Shan Medical University Hospital, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan.
| | - Wen-Chieh Liao
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan; Department of Medical Education, Chung Shan Medical University Hospital, No.110, Sec.1, Jianguo N. Rd, Taichung, Taiwan.
| |
Collapse
|