1
|
Zuo C, Liu Y, Wang Y, Wang Z, Ma H, Wang F, Qiao Y. Underlying effect of SMAD4 gene polymorphism on risk prediction of papillary thyroid carcinoma in Chinese population. Heliyon 2024; 10:e28824. [PMID: 38596142 PMCID: PMC11002234 DOI: 10.1016/j.heliyon.2024.e28824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 03/25/2024] [Accepted: 03/25/2024] [Indexed: 04/11/2024] Open
Abstract
Objective This research intends to explore how variations in the SMAD4 gene impact papillary thyroid carcinoma (PTC) among patients in China. Methods The rs10502913 and rs12968012 polymorphisms were genotyped in 405 subjects using SNP-scan high-throughput technology. Differential mRNA expression of SMAD4 was analyzed using data from TCGA and GSE33630, and protein level expression differences were analyzed using immunohistochemistry. Results The results showed that SMAD4 mRNA expression was lower in thyroid cancer (THCA) tissues than in normal tissues. Immunohistochemical results showed that the expression level of SMAD4 in normal tissue, thyroid papillary carcinoma tissue and poorly differentiated tissue was significantly different. We found that SMAD4 mismatch variants (rs10502913 and rs12968012) were associated with PTC susceptibility. Specifically, the SMAD4-rs10502913 genotypes (GA and AA) showed a notable correlation with a lower likelihood of PTC in comprehensive and segmented studies (genotype GA: OR (95% CI) = 0.270 (0.077-0.950), p = 0.041; genotype AA: OR (95% CI) = 0.103 (0.025-0.416), p = 0.001). We categorized the immunohistochemical results according to genotype and found that rs10502913-GG protein level was expressed at the lowest level, and both GA and AA were higher than GG (GG vs. AA, P < 0.05), and rs12968012-CG protein level was expressed at the lowest level, and both GG and CC were higher than CG (GG vs. CG, P < 0.01). Conclusion Two missense variants of SMAD4 (rs10502913 and rs12968012) are associated with reduced risk of papillary thyroid carcinoma, possibly by reducing protein expression leading to susceptibility to papillary thyroid carcinoma.
Collapse
Affiliation(s)
- Chao Zuo
- Department of Clinical Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China
| | - Yi Liu
- Department of Clinical Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China
| | - Yu Wang
- Department of Geriatrics, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China
| | - Ziqiang Wang
- Research Center of Clinical Laboratory Science, Bengbu Medical College, Bengbu Anhui, China
| | - Hongyu Ma
- Department of Clinical Medicine, Bengbu Medical College, Bengbu, Anhui China
| | - Feng Wang
- Department of Clinical Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China
| | - Yongchao Qiao
- Department of Clinical Laboratory, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi, China
| |
Collapse
|
2
|
Rawat L, Nayak V. Piperlongumine induces ROS mediated apoptosis by transcriptional regulation of SMAD4/P21/P53 genes and synergizes with doxorubicin in osteosarcoma cells. Chem Biol Interact 2022; 354:109832. [PMID: 35085581 DOI: 10.1016/j.cbi.2022.109832] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 01/09/2022] [Accepted: 01/21/2022] [Indexed: 01/21/2023]
Abstract
Piperlongumine is a herbal drug, with well-known anti-microbial and anti-neoplastic properties. The anti-carcinogenic potential of piperlongumine has been extensively explored for breast, colorectal, lungs, pancreatic, prostate, and oral carcinoma. However, a few numbers of studies are available on its bio-activity in osteosarcoma. Therefore, the present study aimed at exploring the therapeutic potential and possible mechanisms of action of piperlongumine in three human osteosarcoma cell lines in-vitro. The cytotoxicity of piperlongumine was determined by MTT assay, which shows dose and time-dependent inhibition of MG-63, 143B and KHOS/NP cells. Piperlongumine arrest the cells in G2/M phase of cell cycle and increases reactive oxygen species production, which possibly leads to lethal oxidative stress and apoptosis. Piperlongumine treatment significantly upregulated the expression of genes BAX, P21, P53, and SMAD4; while the BCL-2, SURVIVIN, TNFA, and NFKB genes expression was found down-regulated. Furthermore, piperlongumine exposure inhibited the migration of osteosarcoma cells as the expression of migration marker genes CDH2, CTNNB1, FN1, and TWIST were found to be down-regulated. The drug combination studies show the synergistic effect of piperlongumine with the conventional chemotherapeutic drug doxorubicin in osteosarcoma cells. Taken together, the above results suggest that PL displays anticancer properties against osteosarcoma and can be used as a therapeutic agent for osteosarcoma treatment in clinical settings.
Collapse
Affiliation(s)
- Laxminarayan Rawat
- Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, K.K. Birla Goa Campus, NH-17B, Zuarinagar, Goa, 403726, India.
| | - Vijayashree Nayak
- Department of Biological Sciences, Birla Institute of Technology and Science, Pilani, K.K. Birla Goa Campus, NH-17B, Zuarinagar, Goa, 403726, India.
| |
Collapse
|
3
|
SMAD4-201 transcript as a putative biomarker in colorectal cancer. BMC Cancer 2022; 22:72. [PMID: 35034624 PMCID: PMC8762975 DOI: 10.1186/s12885-022-09186-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 12/30/2021] [Indexed: 11/28/2022] Open
Abstract
Background Transcripts with alternative 5′-untranslated regions (UTRs) result from the activity of alternative promoters and they can determine gene expression by influencing its stability and translational efficiency, thus executing complex regulation of developmental, physiological and pathological processes. Transcriptional regulation of human SMAD4, a key tumor suppressor deregulated in most gastrointestinal cancers, entails four alternative promoters. These promoters and alternative transcripts they generate remain unexplored as contributors to the SMAD4 deregulation in cancer. The aim of this study was to investigate the relative abundance of the transcript SMAD4–201 in colorectal cell lines and tissues in order to establish if its fluctuations may be associated with colorectal cancer (CRC). Methods Relative abundance of SMAD4–201 in total SMAD4 mRNA was analyzed using quantitative PCR in a set of permanent human colon cell lines and tumor and corresponding healthy tissue samples from patients with CRC. Results The relative abundance of SMAD4–201 in analyzed cell lines varied between 16 and 47%. A similar relative abundance of SMAD4–201 transcript was found in the majority of analyzed human tumor tissue samples, and it was averagely 20% lower in non-malignant in comparison to malignant tissue samples (p = 0.001). Transcript SMAD4–202 was not detectable in any of the analyzed samples, so the observed fluctuations in the composition of SMAD4 transcripts can be attributed to transcripts other than SMAD4–201 and SMAD4–202. Conclusion The expression profile of SMAD4–201 in human tumor and non-tumor tissue samples may indicate the translational potential of this molecule in CRC, but further research is needed to clarify its usability as a potential biomarker for early diagnosis. Supplementary Information The online version contains supplementary material available at 10.1186/s12885-022-09186-z.
Collapse
|
4
|
Luo F, Huang Y, Li Y, Zhao X, Xie Y, Zhang Q, Mei J, Liu X. A narrative review of the relationship between TGF-β signaling and gynecological malignant tumor. ANNALS OF TRANSLATIONAL MEDICINE 2021; 9:1601. [PMID: 34790807 PMCID: PMC8576662 DOI: 10.21037/atm-21-4879] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 10/14/2021] [Indexed: 12/24/2022]
Abstract
Objective This paper reviews the association between transforming growth factor-β (TGF-β) and its receptor and tumor, focusing on gynecological malignant tumors. we hope to provide more methods to help increase the potential of TGF-β signaling targeted treatment of specific cancers. Background The occurrence of a malignant tumor is a complex process of multi-step, multi-gene regulation, and its progression is affected by various components of the tumor cells and/or tumor microenvironment. The occurrence of gynecological diseases not only affect women's health, but also bring some troubles to their normal life. Especially when gynecological malignant tumors occur, the situation is more serious, which will endanger the lives of patients. Due to differences in environmental and economic conditions, not all women have access to assistance and treatment specifically meeting their needs. TGF-β is a multi-potent growth factor that maintains homeostasis in mammals by inhibiting cell growth and promoting apoptosis in vivo. TGF-β signaling is fundamental to inflammatory disease and favors the emergence of tumors, and it also plays an important role in immunosuppression in the tumor microenvironment. In the early stages of the tumor, TGF-β acts as a tumor inhibitor, whereas in advanced tumors, mutations or deletion of the TGF-β signaling core component initiate neogenesis. Methods Literatures about TGF-β and gynecological malignant tumor were extensively reviewed to analyze and discuss. Conclusions We discussed the role of TGF-β signaling in different types of gynecological tumor cells, thus demonstrating that targeted TGF-β signaling may be an effective tumor treatment strategy.
Collapse
Affiliation(s)
- Fangyuan Luo
- Department of Obstetrics and Gynecology, West China Second University Hospital of Sichuan University, Chengdu, China.,Department of Obstetrics and Gynecology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China.,Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital of Sichuan University, Chengdu, China
| | - Yu Huang
- Department of Obstetrics and Gynecology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China
| | - Yilin Li
- Department of Obstetrics and Gynecology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China
| | - Xiaolan Zhao
- Department of Obstetrics and Gynecology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China
| | - Yao Xie
- Department of Obstetrics and Gynecology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China
| | - Qianwen Zhang
- Department of Obstetrics and Gynecology, West China Second University Hospital of Sichuan University, Chengdu, China
| | - Jie Mei
- Department of Obstetrics and Gynecology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, China
| | - Xinghui Liu
- Department of Obstetrics and Gynecology, West China Second University Hospital of Sichuan University, Chengdu, China
| |
Collapse
|
5
|
Molecular Characterization and Functional Analysis of Two Steroidogenic Genes TSPO and SMAD4 in Yellow Catfish. Int J Mol Sci 2021; 22:ijms22094505. [PMID: 33925909 PMCID: PMC8123483 DOI: 10.3390/ijms22094505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/22/2021] [Accepted: 04/22/2021] [Indexed: 11/16/2022] Open
Abstract
The steroid hormones are required for gonadal development in fish. The present study was undertaken to characterize the cDNA and promoter sequences of TSPO and SMAD4 genes in yellow catfish Pelteobagrus fulvidraco, explored the mRNA tissue expression and deciphered their promoter regions. Yellow catfish TSPO and SMAD4 shared the similar domains to the corresponding genes from other vertebrates. The TSPO and SMAD4 mRNAs were widely expressed in the detected tissues, but at different levels. Several transcription factors were predicted, such as Sp, GATA, AP1, SOX1, SRY, STAT, HNF4α, PPARγ, Pu.1 and FOXL2. PPARγ overexpression increased but STAT3 overexpression reduced TSPO promoter activity, and FOXL2 overexpression inhibited the promoter activity of TSPO and SMAD4. The site mutation and EMSA analysis indicated that TSPO promoter possessed STAT3 and FOXL2 sites. Overall, our provided the novel understanding into the transcriptionally regulatory mechanisms of TSPO and SMAD4 in fish.
Collapse
|
6
|
Goulet CR, Pouliot F. TGFβ Signaling in the Tumor Microenvironment. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1270:89-105. [PMID: 33123995 DOI: 10.1007/978-3-030-47189-7_6] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Transforming growth factor beta (TGFβ) is a pleiotropic growth factor. Under normal physiological conditions, TGFβ maintains homeostasis in mammalian tissues by restraining the growth of cells and stimulating apoptosis. However, the role of TGFβ signaling in the carcinogenesis is complex. TGFβ acts as a tumor suppressor in the early stages of disease and as a tumor promoter in its later stages where cancer cells have been relieved from TGFβ growth controls. Overproduction of TGFβ by cancer cells lead to a local fibrotic and immune-suppressive microenvironment that fosters tumor growth and correlates with invasive and metastatic behavior of the cancer cells. Here, we present an overview of the complex biology of the TGFβ family, and we discuss the roles of TGFβ signaling in carcinogenesis and how this knowledge is being leveraged to develop TGFβ inhibition therapies against the tumor.
Collapse
Affiliation(s)
- Cassandra Ringuette Goulet
- Oncology Division, CHU de Québec Research Center, Quebec, QC, Canada
- Department of Surgery, Faculty of Medicine, Laval University, Quebec, QC, Canada
| | - Frédéric Pouliot
- Oncology Division, CHU de Québec Research Center, Quebec, QC, Canada.
- Department of Surgery, Faculty of Medicine, Laval University, Quebec, QC, Canada.
- Department of surgery, CHU de Québec Research Center - Laval University, Quebec City, QC, Canada.
| |
Collapse
|
7
|
Knyazeva M, Korobkina E, Karizky A, Sorokin M, Buzdin A, Vorobyev S, Malek A. Reciprocal Dysregulation of MiR-146b and MiR-451 Contributes in Malignant Phenotype of Follicular Thyroid Tumor. Int J Mol Sci 2020; 21:E5950. [PMID: 32824921 PMCID: PMC7503510 DOI: 10.3390/ijms21175950] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 08/15/2020] [Accepted: 08/17/2020] [Indexed: 01/08/2023] Open
Abstract
Over the last few years, incidental thyroid nodules are being diagnosed with increasing frequency with the use of highly sensitive imaging techniques. The ultrasound thyroid gland examination, followed by the fine-needle aspiration cytology is the standard diagnostic approach. However, in cases of the follicular nature of nodules, cytological diagnosis is not enough. Analysis of miRNAs in the biopsy presents a promising approach. Increasing our knowledge of miRNA's role in follicular carcinogenesis, and development of the appropriate the miRNA analytical technologies are required to implement miRNA-based tests in clinical practice. We used material from follicular thyroid nodes (n.84), grouped in accordance with their invasive properties. The invasion-associated miRNAs expression alterations were assayed. Expression data were confirmed by highly sensitive two-tailed RT-qPCR. Reciprocally dysregulated miRNAs pair concentration ratios were explored as a diagnostic parameter using receiver operation curve (ROC) analysis. A new bioinformatics method (MiRImpact) was applied to evaluate the biological significance of the observed expression alterations. Coupled experimental and computational approaches identified reciprocal dysregulation of miR-146b and miR-451 as important attributes of follicular cell malignant transformation and follicular thyroid cancer progression. Thus, evaluation of combined dysregulation of miRNAs relevant to invasion and metastasis can help to distinguish truly malignant follicular thyroid cancer from indolent follicular adenoma.
Collapse
Affiliation(s)
- Margarita Knyazeva
- Subcellular technology Lab., N. N. Petrov National Medical Center of Oncology, 197758 Saint Petersburg, Russia; (M.K.); (E.K.)
- Oncosystem Company Limited, 121205 Moscow, Russia
- Institute of Biomedical Systems and Biotechnologies, Peter the Great Saint. Petersburg Polytechnic University (SPbPU), 195251 Saint Petersburg, Russia
| | - Ekaterina Korobkina
- Subcellular technology Lab., N. N. Petrov National Medical Center of Oncology, 197758 Saint Petersburg, Russia; (M.K.); (E.K.)
- Oncosystem Company Limited, 121205 Moscow, Russia
| | - Alexey Karizky
- Information Technologies and Programming Faculty, Information Technologies, Mechanics and Optics (ITMO) University, 197101 Saint-Petersburg, Russia;
| | - Maxim Sorokin
- Institute of Personalized Medicine, I.M. Sechenov First Moscow State Medical University, 119048 Moscow, Russia; (M.S.); (A.B.)
- Omicsway Corporation, Walnut, CA 91789, USA
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, 117997 Moscow, Russia
| | - Anton Buzdin
- Institute of Personalized Medicine, I.M. Sechenov First Moscow State Medical University, 119048 Moscow, Russia; (M.S.); (A.B.)
- Omicsway Corporation, Walnut, CA 91789, USA
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, 117997 Moscow, Russia
| | - Sergey Vorobyev
- National Center of Clinical Morphological Diagnostics, 192283 Saint Petersburg, Russia;
| | - Anastasia Malek
- Subcellular technology Lab., N. N. Petrov National Medical Center of Oncology, 197758 Saint Petersburg, Russia; (M.K.); (E.K.)
- Oncosystem Company Limited, 121205 Moscow, Russia
| |
Collapse
|
8
|
Shan X, Liu Q, Li Z, Li C, Gao H, Zhang Y. Epithelial–Mesenchymal Transition Induced by SMAD4 Activation in Invasive Growth Hormone-Secreting Adenomas. OPEN CHEM 2018. [DOI: 10.1515/chem-2018-0061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
AbstractBackgroundThe detection and treatment of invasive growth hormone-secreting pituitary adenoma (GHPA) remains challenging. Several transcription factors promoting the epithelial–mesenchymal transition (EMT) can act as cofactors for the transforming growth factor-beta (TGF-ß)/SMAD4. The goal of this study was to investigate the association of SMAD4 expression and clinicopathologic features using a tissue microarray analysis (TMA). The levels of SMAD4 and the related genes of EMT in GHPAs were analyzed by q-PCR and western blot. SMAD4 was strongly expressed in 15/19 cases (78.9%) of invasive GHPA and 10/42 cases (23.8%) of noninvasive GHPA (χ2=10.887,p=0.000). In the high SMAD4 group, a headache was reported in 16/25 cases (64%) compared with 13/36 cases (36.1%) in the low SMAD4 group (χ2=4.565,p=0.032). The progression-free survival (PFS) in the high group was lower than that in the low group (p=0.026). qRT-PCR and western blot analysis further revealed a significant downregulation of E-cadherin and upregulation of N-cadherin and vimentin in the invasive GHPA group. SMAD4 was associated with increased levels of invasion of GH3 cells, as determined by a transwell test. SMAD4 downregulated E-cadherin levels and increased the levels of N-cadherin and vimentin. Our data provide evidence that SMAD4 is a potential prognosis biomarker and a therapeutic target for patients with invasive GHPA.
Collapse
Affiliation(s)
- Xiaosong Shan
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Qian Liu
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Zhenye Li
- Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Chuzhong Li
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
| | - Hua Gao
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
- Beijing Institute for Brain Disorders, Brain Tumor Center, Beijing, China National Clinical Research Center for Neurological Diseases, Beijing, China
| | - Yazhuo Zhang
- Beijing Neurosurgical Institute, Capital Medical University, Beijing, China
- Beijing Institute for Brain Disorders, Brain Tumor Center, Beijing, China National Clinical Research Center for Neurological Diseases, Beijing, China
| |
Collapse
|
9
|
Li X, Yang H, Ke J, Liu B, Lv X, Li X, Zhang Y. Smad4 re-expression increases the sensitivity to parthenolide in colorectal cancer. Oncol Rep 2017; 38:2317-2324. [PMID: 28902368 DOI: 10.3892/or.2017.5929] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 08/08/2017] [Indexed: 11/06/2022] Open
Abstract
Parthenolide (PT), a sesquiterpene lactone extracted from the plant feverfew, has been demonstrated to have anti-inflammatory and anticancer properties. Although PT has been revealed to markedly inhibit colorectal cancer cell proliferation, the inhibitory effects decrease with administration time. These findings revealed that colorectal cancer cells develop resistance to PT. However, the underlying mechanism is unclear. In the present study we observed significantly low expression of Smad4 in 3 PT-resistant cell lines (HCT‑116/PT, HT-29/PT and Caco-2/PT), which were obtained using in vitro concentration gradient-increased induction, but not in their parental cells. In the present study we used the lentiviral‑mediated transfection method to upregulate Smad4 in resistant colorectal cancer cell lines. Flow cytometry assay was used to assess cell apoptosis. Cell migration was detected using a QCM™ 24-well Fluorimetric Cell Migration Assay kit. Our study showed that Smad4 overexpression notably decreased the half maximal inhibitory concentration (IC50) values for PT in the 3 PT-resistant cell lines, and improved the inhibitory effects of PT on cell migration and enhanced apoptosis in vitro as well as suppressed xenografted tumors in a PT-resistant colorectal cancer mouse model. Further study by western blotting into the underlying mechanism demonstrated that Smad4 overexpression suppressed the expression of MDR1 in the resistant cells, and resulted in the accumulation of PT, which in turn promoted the expession of caspase-3 and Bax and inhibited the expression of Bcl-2 and the phosphorylation of NF-κB p65. In short, Smad4 re-expression may be crucial for enhancing the sensitivity and reversing the resistance to PT in PT-resistant colorectal cancer cells.
Collapse
Affiliation(s)
- Xuemei Li
- Department of Anatomy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Huike Yang
- Department of Anatomy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Jia Ke
- Department of Anatomy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Baoquan Liu
- Department of Anatomy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Xiaohong Lv
- Department of Anatomy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Xinlei Li
- Department of Anatomy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Yafang Zhang
- Department of Anatomy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| |
Collapse
|