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Zhang Y, Zuo D, Qiu J, Li K, Niu Y, Yuan Y, Qiu Y, Qiao L, He W, Wang C, Yuan Y, Li B. NXN suppresses metastasis of hepatocellular carcinoma by promoting degradation of Snail through binding to DUB3. Cell Death Dis 2022; 13:676. [PMID: 35927236 PMCID: PMC9352874 DOI: 10.1038/s41419-022-05135-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 07/04/2022] [Accepted: 07/25/2022] [Indexed: 01/21/2023]
Abstract
The poor prognosis of hepatocellular carcinoma (HCC) could be attributed to its high metastasis rate. Here, we report the role of nucleoredoxin (NXN), a multifunctional redox-active protein, in HCC metastasis. The expression of NXN in HCC tissues was measured by immunohistochemistry. The role of NXN on HCC proliferation was determined by CCK-8, EdU and colony formation assays in vitro and subcutaneous tumor formation model in vivo. Transwell and wound healing assays and tail vein injection model were performed to assess the function of NXN on HCC metastasis. Co-immunoprecipitation assay was performed to examine the interaction among NXN, Snail and DUB3. Our results showed that NXN was downregulated in HCC tissues compared to adjacent liver tissues. Patients with low NXN expression had shorter overall survival (OS) time (P < 0.001) than those with high NXN expression. Biologically, ectopic expression of NXN significantly inhibited the proliferation and metastasis of HCC cells both in vitro and in vivo by suppressing epithelial-mesenchymal transition (EMT). Mechanistically, NXN promoted the ubiquitin-proteasome-mediated degradation of Snail through interaction with DUB3. Further, depletion of Snail abolished NXN-inhibited cell proliferation and metastasis. In summary, NXN suppressed the proliferation and metastasis of HCC by inhibiting DUB3-mediated deubiquitylation of Snail protein. Our study demonstrates that NXN, DUB3 and Snail complex functioned as an important regulatory mechanism of HCC progression and indicates a potential therapeutic approach for the treatment of HCC metastasis.
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Affiliation(s)
- Yuanping Zhang
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Dinglan Zuo
- grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Jiliang Qiu
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Kai Li
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Yi Niu
- grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Yichuan Yuan
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Yuxiong Qiu
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Liang Qiao
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Wei He
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Chenwei Wang
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Yunfei Yuan
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
| | - Binkui Li
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China and Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, China ,grid.488530.20000 0004 1803 6191Department of Liver Surgery, Sun Yat-Sen University Cancer Center, Guangzhou, China
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The Role of ATRA, Natural Ligand of Retinoic Acid Receptors, on EMT-Related Proteins in Breast Cancer: Minireview. Int J Mol Sci 2021; 22:ijms222413345. [PMID: 34948142 PMCID: PMC8705994 DOI: 10.3390/ijms222413345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 12/09/2021] [Accepted: 12/10/2021] [Indexed: 12/17/2022] Open
Abstract
The knowledge of the structure, function, and abundance of specific proteins related to the EMT process is essential for developing effective diagnostic approaches to cancer with the perspective of diagnosis and therapy of malignancies. The success of all-trans retinoic acid (ATRA) differentiation therapy in acute promyelocytic leukemia has stimulated studies in the treatment of other tumors with ATRA. This review will discuss the impact of ATRA use, emphasizing epithelial-mesenchymal transition (EMT) proteins in breast cancer, of which metastasis and recurrence are major causes of death.
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Xie X, Lin H, Zhang X, Song P, He X, Zhong J, Shi J. Overexpression of GDP dissociation inhibitor 1 gene associates with the invasiveness and poor outcomes of colorectal cancer. Bioengineered 2021; 12:5595-5606. [PMID: 34515625 PMCID: PMC8806759 DOI: 10.1080/21655979.2021.1967031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 08/04/2021] [Accepted: 08/05/2021] [Indexed: 12/24/2022] Open
Abstract
GDP dissociation inhibitor (GDI) regulates the GDP/GTP exchange reaction of most Rab proteins by inhibiting GDP dissociation. This study evaluated the potential prognostic and predictive value of GDI1 in colorectal cancer (CRC). To address the prognostic power of GDI1, we performed individual and pooled survival analyses on six independent CRC microarray gene expression datasets. GDI1-enriched signatures were also analyzed. Kaplan-Meier and Cox proportional analyses were employed for survival analysis. An immunohistochemistry (IHC) analysis was performed to validate the clinical relevance and prognostic significance of the GDI1 protein level in CRC tissue samples. The results revealed that GDI1 mRNA level was significantly linked with the aggressiveness of CRC, which is compatible with gene set enrichment analysis. A meta-analysis and pooled analysis demonstrated that a higher mRNA GDI1 expression was dramatically correlated with a worse survival in a dose-dependent manner in CRC patients. Further IHC analysis validated that the protein expression of GDI1 in both cytoplasm and membrane also significantly impacted the outcome of CRC patients. In CRC patients with stage III, chemotherapy significantly reduced the relative risk of death in low-GDI1 subgroup (hazard ratio (HR) = 0.22; 95% confidence interval (95% CI) 0.09-0.56, p = 0.0003), but not in high-GDI1 subgroup (HR = 0.63; 95% CI 0.35-1.14, p = 0.1137). Therefore, both high mRNA and protein levels of GDI1 were significantly related to poor outcomes in CRC patients. GD11 may serve as a prognostic biomarker for CRC.
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Affiliation(s)
- Xiao Xie
- Department of Gastroenterology, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Affiliated Huzhou Hospital Zhejiang University School of Medicine, Huzhou, Zhejiang Province, China
| | - Huajiang Lin
- Department of Gastroenterology, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Affiliated Huzhou Hospital Zhejiang University School of Medicine, Huzhou, Zhejiang Province, China
| | - Xiaolei Zhang
- Department of Gastroenterology, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Affiliated Huzhou Hospital Zhejiang University School of Medicine, Huzhou, Zhejiang Province, China
| | - Pengtao Song
- Department of Pathology, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Affiliated Huzhou Hospital Zhejiang University School of Medicine, Huzhou, Zhejiang Province, China
| | - Xiangyi He
- Department of Pathology, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Affiliated Huzhou Hospital Zhejiang University School of Medicine, Huzhou, Zhejiang Province, China
| | - Jing Zhong
- Huzhou Key Laboratory of Molecular Medicine, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Affiliated Huzhou Hospital Zhejiang University School of Medicine, Huzhou, Zhejiang Province, China
| | - Jiemin Shi
- Department of Gastroenterology, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Affiliated Huzhou Hospital Zhejiang University School of Medicine, Huzhou, Zhejiang Province, China
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Mahmood RI, Abbass AK, Razali N, Al-Saffar AZ, Al-Obaidi JR. Protein profile of MCF-7 breast cancer cell line treated with lectin delivered by CaCO 3NPs revealed changes in molecular chaperones, cytoskeleton, and membrane-associated proteins. Int J Biol Macromol 2021; 184:636-647. [PMID: 34174302 DOI: 10.1016/j.ijbiomac.2021.06.144] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 06/16/2021] [Accepted: 06/21/2021] [Indexed: 02/09/2023]
Abstract
The second most predominant cancer in the world and the first among women is breast cancer. We aimed to study the protein abundance profiles induced by lectin purified from the Agaricus bisporus mushroom (ABL) and conjugated with CaCO3NPs in the MCF-7 breast cancer cell line. Two-dimensional electrophoresis (2-DE) and orbitrap mass spectrometry techniques were used to reveal the protein abundance pattern induced by lectin. Flow cytometric analysis showed the accumulation of ABL-CaCO3NPs treated cells in the G1 phase than the positive control. Thirteen proteins were found different in their abundance in breast cancer cells after 24 h exposure to lectin conjugated with CaCO3NPs. Most of the identified proteins were showing a low abundance in ABL-CaCO3NPs treated cells in comparison to the positive and negative controls, including V-set and immunoglobulin domain, serum albumin, actin cytoplasmic 1, triosephosphate isomerase, tropomyosin alpha-4 chain, and endoplasmic reticulum chaperone BiP. Hornerin, tropomyosin alpha-1 chain, annexin A2, and protein disulfide-isomerase were up-regulated in comparison to the positive. Bioinformatic analyses revealed the regulation changes of these proteins mainly affected the pathways of 'Bcl-2-associated athanogene 2 signalling pathway', 'Unfolded protein response', 'Caveolar-mediated endocytosis signalling', 'Clathrin-mediated endocytosis signalling', 'Calcium signalling' and 'Sucrose degradation V', which are associated with breast cancer. We concluded that lectin altered the abundance in molecular chaperones/heat shock proteins, cytoskeletal, and metabolic proteins. Additionally, lectin induced a low abundance of MCF-7 cancer cell proteins in comparison to the positive and negative controls, including; V-set and immunoglobulin domain, serum albumin, actin cytoplasmic 1, triosephosphate isomerase, tropomyosin alpha-4 chain, and endoplasmic reticulum chaperone BiP.
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Affiliation(s)
- Rana I Mahmood
- Department of Biology, College of Science, Baghdad University, Baghdad, Iraq; Department of Biomedical Engineering, College of Engineering, Al-Nahrain University, Baghdad, Iraq
| | - Amal Kh Abbass
- Department of Biology, College of Science, Baghdad University, Baghdad, Iraq
| | - Nurhanani Razali
- Department of Hygienic Sciences, Kobe Pharmaceutical University, Motoyamakita-machi, Higashinada-ku, 658-8558, Kobe, Japan; Membranology Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa, Japan, 904-0495
| | - Ali Z Al-Saffar
- Department of Molecular and Medical Biotechnology, College of Biotechnology, Al-Nahrain University, Baghdad, Iraq
| | - Jameel R Al-Obaidi
- Department of Biology, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, 35900 Tanjong Malim, Perak, Malaysia.
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The putative tumour suppressor protein Latexin is secreted by prostate luminal cells and is downregulated in malignancy. Sci Rep 2019; 9:5120. [PMID: 30914656 PMCID: PMC6435711 DOI: 10.1038/s41598-019-41379-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 02/28/2019] [Indexed: 11/09/2022] Open
Abstract
Loss of latexin (LXN) expression negatively correlates with the prognosis of several human cancers. Despite association with numerous processes including haematopoietic stem cell (HSC) fate, inflammation and tumour suppression, a clearly defined biological role for LXN is still lacking. Therefore, we sought to understand LXN expression and function in the normal and malignant prostate to assess its potential as a therapeutic target. Our data demonstrate that LXN is highly expressed in normal prostate luminal cells but downregulated in high Gleason grade cancers. LXN protein is both cytosolic and secreted by prostate cells and expression is directly and potently upregulated by all-trans retinoic acid (atRA). Whilst overexpression of LXN in prostate epithelial basal cells did not affect cell fate, LXN overexpression in the luminal cancer line LNCaP reduced plating efficiency. Transcriptome analysis revealed that LXN overexpression had no direct effects on gene expression but had significant indirect effects on important genes involved in both retinoid metabolism and IFN-associated inflammatory responses. These data highlight a potential role for LXN in retinoid signaling and inflammatory pathways. Investigating the effects of LXN on immune cell function in the tumour microenvironment (TME) may reveal how observed intratumoural loss of LXN affects the prognosis of many adenocarcinomas.
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Koch C, Kohn FPM, Bauer J. Preparing normal tissue cells for space flight experiments. Prep Biochem Biotechnol 2015; 46:208-13. [PMID: 25806650 DOI: 10.1080/10826068.2015.1015565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Deterioration of health is a problem in modern space flight business. In order to develop countermeasures, research has been done on human bodies and also on single cells. Relevant experiments on human cells in vitro are feasible when microgravity is simulated by devices such as the Random Positioning Machine or generated for a short time during parabolic flights. However, they become difficult in regard to performance and interpretation when long-term experiments are designed that need a prolonged stay on the International Space Station (ISS). One huge problem is the transport of living cells from a laboratory on Earth to the ISS. For this reason, mainly rapidly growing, rather robust human cells such as cancer cells, embryonic cells, or progenitor cells have been investigated on the ISS up to now. Moreover, better knowledge on the behavior of normal mature cells, which mimic the in vivo situation, is strongly desirable. One solution to the problem could be the use of redifferentiable cells, which grow rapidly and behave like cancer cells in plain medium, but are reprogrammed to normal cells when substances like retinoic acid are added. A list of cells capable of redifferentiation is provided, together with names of suitable drugs, in this review.
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Affiliation(s)
- Claudia Koch
- a Institute of Physiology, Department of Membrane Physiology , University of Hohenheim , Stuttgart , Germany
| | - Florian P M Kohn
- a Institute of Physiology, Department of Membrane Physiology , University of Hohenheim , Stuttgart , Germany
| | - Johann Bauer
- b Max Planck Institute of Biochemistry , Martinsried , Germany
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Chen MC, Hsu SL, Lin H, Yang TY. Retinoic acid and cancer treatment. Biomedicine (Taipei) 2014; 4:22. [PMID: 25520935 PMCID: PMC4265016 DOI: 10.7603/s40681-014-0022-1] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 11/05/2014] [Indexed: 12/18/2022] Open
Abstract
Retinoic acid which belongs to the retinoid class of chemical compounds is an important metabolite of vitamin A in diets. It is currently understood that retinoic acid plays important roles in cell development and differentiation as well as cancer treatment. Lung, prostate, breast, ovarian, bladder, oral, and skin cancers have been demonstrated to be suppressed by retinoic acid. Our results also show that low doses and high doses of retinoic acid may respectively cause cell cycle arrest and apoptosis of cancer cells. Also, the common cell cycle inhibiting protein, p27, and the new cell cycle regulator, Cdk5, are involved in retinoic acid’s effects. These results provide new evidence indicating that the molecular mechanisms of/in retinoic acid may control cancer cells’ fates. Since high doses of retinoic acid may lead to cytotoxicity, it is probably best utilized as a potential supplement in one’s daily diet to prevent or suppress cancer progression. In this review, we have collected numerous references demonstrating the findings of retinoic acid in melanoma, hepatoma, lung cancer, breast cancer, and prostate cancer. We hope these observations will shed light on the future investigation of retinoic acid in cancer prevention and therapy.
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Affiliation(s)
- Mei-Chih Chen
- Department of Medical Research, Taichung Veterans General Hospital, Taichung 407, Taichung, Taiwan
| | - Shih-Lan Hsu
- Department of Medical Research, Taichung Veterans General Hospital, Taichung 407, Taichung, Taiwan
| | - Ho Lin
- Department of Life Sciences, National Chung Hsing University, No. 250, Kuokuang Rd., Taichung 402, Taichung, Taiwan
| | - Tsung-Ying Yang
- Department of Chest Medicine, Taichung Veterans General Hospital, No. 160, Taichung Harbor Rd., Sec. 3, Taichung 407, Taichung, Taiwan
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Ming Z, Guo C, Jiang M, Li W, Zhang Y, Fan N, Zhong Y, Meng X, Yang S. Bioinformatics analysis of Rab GDP dissociation inhibitor beta and its expression in non-small cell lung cancer. Diagn Pathol 2014; 9:201. [PMID: 25367783 PMCID: PMC4223158 DOI: 10.1186/s13000-014-0201-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 10/08/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Lung cancer has been considered as one of the most important causes of cancer-related mortality worldwide. To predict lung cancer, researchers identified several molecular markers. However, many underlying markers of lung cancer remain unclear. One of these markers is Rab GDP dissociation inhibitor beta (GDIβ), which is related to tumorigenicity, development and invasion. This study was designed to analyze the biological characteristics of Rab GDIβ and to detect the mRNA and protein expressions of Rab GDIβ in lung cancer cells; this study also aimed to investigate the functions of this protein in lung cancer. METHOD Using online software from the websites of NCBI, ProtParam and so on, we analyzed the biological characteristics of Rab GDIβ. RT-PCR was performed to detect gene expressions in A549 and 16HBE cell lines and immunohistochemistry (IHC) staining was conducted to detect Rab GDIβ protein expression in 57 cases of human lung cancer tissues and 19 cases of normal lung tissues. The association of protein expression with patient clinical and pathological characteristics was assessed in each dataset. RESULTS Bioinformatic analysis on Rab GDIβ: The mRNA of human Rab GDIβ contains two transcript variants; the common structural elements of the two proteins are mainly α-helix, random coil, β-turn and extended strand. Three and four transmembrane domains could be found in the entire polypeptide chain of protein variants 1 and 2, respectively; both transcript variants are hydrophilic and soluble proteins. The RT-PCR result: The mRNA expression of Rab GDIβ was down-regulation in A549 cells compared with that in 16HBE cells. The IHC result: The protein expression of Rab GDIβ in lung cancer cells was significantly lower than that in normal lung tissues (P <0.05) but was not correlated with patients' age, gender, tumor size, pathological type, differentiation, lymph node metastasis, distant metastasis and TNM stage. CONCLUSION The expression of Rab GDIβ was low in non-small cell lung cancer (NSCLC). Hence, Rab GDIβ may be a tumor suppressor and could function as an indicator of tumorigenesis in NSCLC; nevertheless, this result should be further studied. VIRTUAL SLIDES The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/13000_2014_201.
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Affiliation(s)
- Zongjuan Ming
- />Department of Respiratory Medicine, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710004 China
| | - Chunli Guo
- />Department of Respiratory Medicine, People’s Hospital of Tongchuan City, Tongchuan, 727000 China
| | - Meihua Jiang
- />Department of Respiratory Medicine, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710004 China
| | - Wei Li
- />Department of Respiratory Medicine, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710004 China
| | - Yuping Zhang
- />Department of Respiratory Medicine, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710004 China
| | - Na Fan
- />Department of Respiratory Medicine, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710004 China
| | - Yujie Zhong
- />Department of Respiratory Medicine, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710004 China
| | - Xia Meng
- />Department of Respiratory Medicine, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710004 China
| | - Shuanying Yang
- />Department of Respiratory Medicine, the Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710004 China
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