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Takashima Y, Komatsu S, Ohashi T, Kiuchi J, Kamiya H, Shimizu H, Arita T, Konishi H, Shiozaki A, Kubota T, Okamoto K, Fujiwara H, Tsuda H, Otsuji E. Overexpression of Tetraspanin31 contributes to malignant potential and poor outcomes in gastric cancer. Cancer Sci 2022; 113:1984-1998. [PMID: 35307915 PMCID: PMC9207375 DOI: 10.1111/cas.15342] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 03/09/2022] [Accepted: 03/12/2022] [Indexed: 12/24/2022] Open
Abstract
Tetraspanin has important functions in many cancers by aggregating with various proteins that interact with intracellular signaling proteins. The molecular function of Tetraspanin31 (TSPAN31), located in the 12q14 amplified region in various cancers, remains unclear in gastric cancer (GC). We tested whether TSPAN31 acts as a cancer‐promoting gene through its activation or overexpression in GC. We analyzed seven GC cell lines and 189 primary tumors, which were curatively resected in our hospital between 2011 and 2013. Overexpression of the TSPAN31 protein was frequently detected in three GC cell lines (42.9%) and 62 primary GC specimens (32.8%). Overexpression of TSPAN31 was significantly correlated with lymphatic invasion, venous invasion, more advanced pT and pN stages, and a higher recurrence rate. Moreover, TSPAN31 positivity was an independent factor predicting worse patient outcomes (p = 0.0283, hazard ratio 3.97). Ectopic overexpression of TSPAN31 facilitated cell proliferation of GC cells, and knockdown of TSPAN31 inhibited cell proliferation, migration, invasion, and epithelial–mesenchymal transition of GC cells through the PI3K‐Akt pathway and increased cell apoptosis in a TP53 mutation‐independent manner. In vivo analysis also revealed knockdown of TSPAN31 suppressed tumor progression. In addition, knockdown of TSPAN31 improved chemosensitivity to cisplatin through the suppression of ABCC2. These findings suggest that TSPAN31 plays a crucial role in tumor‐malignant potential through overexpression, highlighting its utility as a prognostic factor and a potential therapeutic target in GC.
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Affiliation(s)
- Yusuke Takashima
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Shuhei Komatsu
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takuma Ohashi
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Jun Kiuchi
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hajime Kamiya
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hiroki Shimizu
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Tomohiro Arita
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hirotaka Konishi
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Atsushi Shiozaki
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Takeshi Kubota
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kazuma Okamoto
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hitoshi Fujiwara
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hitoshi Tsuda
- Department of Pathology, National Cancer Center Hospital, Tokyo, Japan.,Department of Basic Pathology, National Defense Medical College, Tokorozawa, Japan
| | - Eigo Otsuji
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Chen J, Li Y, Xie X. MicroRNA-425 inhibits proliferation of chronic lymphocytic leukaemia cells through regulation of the Bruton's tyrosine kinase/phospholipase Cγ2 signalling pathway. Exp Ther Med 2020; 20:1169-1175. [PMID: 32742355 PMCID: PMC7388289 DOI: 10.3892/etm.2020.8771] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Accepted: 07/26/2018] [Indexed: 12/12/2022] Open
Abstract
The present study aimed to investigate the effects of microRNA (miR)-425 on the proliferation of chronic lymphocytic leukaemia (CLL) cells and the possible underlying mechanisms. The expression of miR-425 was determined in the B lymphocytes of CLL patients and in normal B lymphocytes by reverse transcription-quantitative polymerase chain reaction (RT-qPCR). In addition, MEC-1 cells transfected with miR-425 negative control (NC) or miR-425 mimic were examined. The cell proliferation of different groups was evaluated using an MTT assay, and cell cycle distribution was evaluated using flow cytometry analysis. A dual-luciferase reporter assay was used to verify whether Bruton's tyrosine kinase (BTK) was a target of miR-425. Furthermore, the expression levels of BTK, phospholipase Cγ2 (PLCγ2), Ki-67 and proliferating cell nuclear antigen (PCNA) were determined by RT-qPCR and western blotting. The results revealed that the expression of miR-425 was significantly downregulated in B lymphocytes obtained from CLL patients as compared with that in normal B lymphocytes. When cells were transfected with miR-425 mimic, the proliferation of MEC-1 cells was significantly inhibited at 24, 48 and 72 h compared with the proliferation of control cells. Additionally, the ratio of G0/G1 cells was significantly increased and the ratio of G2/M cells was significantly decreased in miR-425-overexpressing cells compared with that in control cells. The luciferase reporter assay revealed that miR-425 binds to the 3'-untranslated region of BTK mRNA. Finally, BTK, PLCγ2, Ki-67 and PCNA expression was significantly inhibited at the mRNA and protein level in cells where miR-425 was upregulated. In conclusion, miR-425 inhibits the proliferation of MEC-1 cells, potentially by inhibiting BTK/PLCγ2 signalling, and Ki-67 and PCNA expression levels. These results provide a deeper insight for understanding the development of CLL and suggest a potential novel target for the treatment of CLL patients.
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Affiliation(s)
- Jianying Chen
- Department of Rheumatology, Hunan Provincial People's Hospital, Changsha, Hunan 410012, P.R. China
| | - Yuhua Li
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510006, P.R. China
| | - Xiaoling Xie
- Department of Hematology, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510006, P.R. China
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New uracil analogs as downregulators of ABC transporters in 5-fluorouracil-resistant human leukemia HL-60 cell line. Mol Biol Rep 2019; 46:5831-5839. [DOI: 10.1007/s11033-019-05017-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 07/31/2019] [Indexed: 12/30/2022]
Abstract
AbstractOverexpression of ATP-binding cassette (ABC) transporters causing multidrug resistance (MDR) in cancer cells is one of the major obstacles in cancer chemotherapy. The 5-FU resistant subclone (HL-60/5FU) of the human HL-60 promyelocytic leukemia cell line was selected by the conventional method of continuous exposure of the cells to the drug up to 0.08 mmol/L concentration. HL-60/5FU cells exhibited six-fold enhanced resistance to 5-FU than HL-60 cells. RT-PCR and ELISA assay showed significant overexpression of MDR-related ABC transporters, ABCB1, ABCG2 but especially ABCC1 in the HL-60/5FU as compared with the parental cell line. Three novel synthetic 5-methylidenedihydrouracil analogs, U-236, U-332 and U-359, selected as highly cytotoxic for HL-60 cells in MTT test, showed similar cytotoxicity in the resistant cell line. When co-incubated with 5-FU, these analogs were found to down-regulate the expression of all three transporters. However, the most pronounced effect was caused by U-332 which almost completely abolished ABCC1 expression in the resistant HL-60/5FU cells. Additionally, U-332 inhibited the activity of ATPase, an enzyme which catalyzes hydrolysis of ATP, providing energy to efflux drugs from the cells through the cellular membranes. Taken together, the obtained data suggest that acquired 5-FU resistance in HL-60/5FU cells results from overexpression of ABCC1 and that targeting ABCC1 expression could be a potential approach to re-sensitize resistant leukemia cells to 5-FU. The synthetic uracil analog U-332, which can potently down-regulate ABC transporter expression and therefore disturb drug efflux, can be considered an efficient ABCC1 regulator in cancer cells.
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Xu X, Li Q, Yu K, Murtaza G, Liu B. Baicalin-induced Cytotoxicity and Apoptosis in Multidrug-resistant MC3/5FU Mucoepidermoid Carcinoma Cell Line. LETT DRUG DES DISCOV 2019. [DOI: 10.2174/157018081210151012121717] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Multidrug Resistance (MDR) is a serious hindrance to cancer chemotherapy
and profoundly influences the clinical findings. Many Traditional Chinese Medicines (TCM) have
been tested with the aim of developing effective resistance modulators or anticancer drugs to overcome
the MDR of human cancers.
Methods:
The anticancer effect of baicalin on multidrug-resistant MC3/5FU (5-fluorouracil) cells
was investigated by MTT test and xenografts in nude mice. Cell apoptosis was studied by transmission
electron microscopy, Hoechst-33342 staining, DNA fragmentation detection, and flow cytometry.
RT-PCR and Rhodamine 123 efflux assay was also used to detect its effect on ABC drug transporter
proteins, ABCB1 (P-glycoprotein, P-gp) and ABCC1 (multidrug resistance protein 1, MRP1).
Results:
The results indicate that there was no significant effect of baicalin on ABC transporters
expression or efflux function, although it induced potent growth inhibition in MC3/5FU cells. Flow
cytometry, Hoechst 33342 staining and transmission electron microscope revealed that baicalin
caused MC3/5FU cell death through the induction of apoptosis. It is demonstrated that baicalininduced
apoptosis could be mediated by up-regulation of Bax and caspase-3 protein levels and downregulation
of Bcl-2 protein levels. In addition, daily intraperitoneal injection of baicalin (100 and 200
mg/kg) for 2 weeks significantly inhibited the growth of MC3/5FU cells xenografts in nude mice.
Conclusion:
Our results suggest that baicalin possesses considerable cytotoxic activity in multidrug
resistance MC3/5FU cells in vitro and in vivo.
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Affiliation(s)
- Xiaofang Xu
- Department of Stomatology, Affiliated Hospital of the Academy of Military Medical Sciences, Beijing 100071, China
| | - Qihong Li
- Department of Stomatology, Affiliated Hospital of the Academy of Military Medical Sciences, Beijing 100071, China
| | - Kaitao Yu
- Department of Stomatology, Affiliated Hospital of the Academy of Military Medical Sciences, Beijing 100071, China
| | - Ghulam Murtaza
- Department of Pharmacy, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan
| | - Bin Liu
- State Key Laboratory of Military Stomatology, Laboratory Animal Center, School of Stomatology, The Fourth Military Medical University, 145th West Changle Road, Xi'an 710032, China
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Li Q, Zhou T, Wu F, Li N, Wang R, Zhao Q, Ma YM, Zhang JQ, Ma BL. Subcellular drug distribution: mechanisms and roles in drug efficacy, toxicity, resistance, and targeted delivery. Drug Metab Rev 2018; 50:430-447. [PMID: 30270675 DOI: 10.1080/03602532.2018.1512614] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
After administration, drug molecules usually enter target cells to access their intracellular targets. In eukaryotic cells, these targets are often located in organelles, including the nucleus, endoplasmic reticulum, mitochondria, lysosomes, Golgi apparatus, and peroxisomes. Each organelle type possesses unique biological features. For example, mitochondria possess a negative transmembrane potential, while lysosomes have an intraluminal delta pH. Other properties are common to several organelle types, such as the presence of ATP-binding cassette (ABC) or solute carrier-type (SLC) transporters that sequester or pump out xenobiotic drugs. Studies on subcellular drug distribution are critical to understand the efficacy and toxicity of drugs along with the body's resistance to them and to potentially offer hints for targeted subcellular drug delivery. This review summarizes the results of studies from 1990 to 2017 that examined the subcellular distribution of small molecular drugs. We hope this review will aid in the understanding of drug distribution within cells.
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Affiliation(s)
- Qiao Li
- a Department of Pharmacology , Shanghai University of Traditional Chinese Medicine , Shanghai , China
| | - Ting Zhou
- a Department of Pharmacology , Shanghai University of Traditional Chinese Medicine , Shanghai , China
| | - Fei Wu
- b Engineering Research Center of Modern Preparation Technology of TCM of Ministry of Education , Shanghai University of Traditional Chinese Medicine , Shanghai , China
| | - Na Li
- c Department of Chinese materia medica , School of Pharmacy , Shanghai , China
| | - Rui Wang
- b Engineering Research Center of Modern Preparation Technology of TCM of Ministry of Education , Shanghai University of Traditional Chinese Medicine , Shanghai , China
| | - Qing Zhao
- a Department of Pharmacology , Shanghai University of Traditional Chinese Medicine , Shanghai , China
| | - Yue-Ming Ma
- a Department of Pharmacology , Shanghai University of Traditional Chinese Medicine , Shanghai , China
| | - Ji-Quan Zhang
- b Engineering Research Center of Modern Preparation Technology of TCM of Ministry of Education , Shanghai University of Traditional Chinese Medicine , Shanghai , China
| | - Bing-Liang Ma
- a Department of Pharmacology , Shanghai University of Traditional Chinese Medicine , Shanghai , China
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Fang J, Ye Z, Gu F, Yan M, Lin Q, Lin J, Wang Z, Xu Y, Wang Y. DUSP1 enhances the chemoresistance of gallbladder cancer via the modulation of the p38 pathway and DNA damage/repair system. Oncol Lett 2018; 16:1869-1875. [PMID: 30008878 DOI: 10.3892/ol.2018.8822] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 11/21/2017] [Indexed: 01/03/2023] Open
Abstract
Cisplatin (CDDP) is a commonly used drug for gallbladder cancer (GBC) chemotherapy. However, resistance to CDDP treatment results in relapse. Therefore, there is a need for the development of more effective treatment strategies to overcome chemoresistance. Dual-specificity phosphatase 1 (DUSP1) was reported to be involved in the resistance of a number of chemotherapeutic agents and was revealed to be highly expressed in CDDP-resistant GBC cells and CDDP-treated tumor types compared with normal cells or tissues in the present study. DUSP1 was revealed to inhibit the cytotoxicity of CDDP in two GBC cell lines, SGC996 and GBC-SD. P38 mitogen-activated protein kinases may be involved in the mechanism of chemoresistance. Furthermore, the number of DNA double-strand breaks in SGC996 OE cells was reduced compared with SGC996 vector cells indicating DUSP1 may attenuate the chemotherapeutic efficiency. Due to its potency against CDDP treatment, DUSP1 may be a promising target to overcome chemoresistance in GBC therapy.
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Affiliation(s)
- Jun Fang
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Zhimin Ye
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Feiying Gu
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Maohui Yan
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Qingren Lin
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Juan Lin
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Zhun Wang
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Yaping Xu
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
| | - Yuezhen Wang
- Department of Radiation Oncology, Zhejiang Province Cancer Hospital, Hangzhou, Zhejiang 310022, P.R. China
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Abstract
Cancer is a daunting global problem confronting the world's population. The most frequent therapeutic approaches include surgery, chemotherapy, radiotherapy, and more recently immunotherapy. In the case of chemotherapy, patients ultimately develop resistance to both single and multiple chemotherapeutic agents, which can culminate in metastatic disease which is a major cause of patient death from solid tumors. Chemoresistance, a primary cause of treatment failure, is attributed to multiple factors including decreased drug accumulation, reduced drug-target interactions, increased populations of cancer stem cells, enhanced autophagy activity, and reduced apoptosis in cancer cells. Reprogramming tumor cells to undergo drug-induced apoptosis provides a promising and powerful strategy for treating resistant and recurrent neoplastic diseases. This can be achieved by downregulating dysregulated antiapoptotic factors or activation of proapoptotic factors in tumor cells. A major target of dysregulation in cancer cells that can occur during chemoresistance involves altered expression of Bcl-2 family members. Bcl-2 antiapoptotic molecules (Bcl-2, Bcl-xL, and Mcl-1) are frequently upregulated in acquired chemoresistant cancer cells, which block drug-induced apoptosis. We presently overview the potential role of Bcl-2 antiapoptotic proteins in the development of cancer chemoresistance and overview the clinical approaches that use Bcl-2 inhibitors to restore cell death in chemoresistant and recurrent tumors.
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Gordillo GM, Biswas A, Khanna S, Spieldenner JM, Pan X, Sen CK. Multidrug Resistance-associated Protein-1 (MRP-1)-dependent Glutathione Disulfide (GSSG) Efflux as a Critical Survival Factor for Oxidant-enriched Tumorigenic Endothelial Cells. J Biol Chem 2016; 291:10089-103. [PMID: 26961872 DOI: 10.1074/jbc.m115.688879] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Indexed: 12/28/2022] Open
Abstract
Endothelial cell tumors are the most common soft tissue tumors in infants. Tumor-forming endothelial (EOMA) cells are able to escape cell death fate despite excessive nuclear oxidant burden. Our previous work recognized perinuclear Nox-4 as a key contributor to EOMA growth. The objective of this work was to characterize the mechanisms by which EOMA cells evade oxidant toxicity and thrive. In EOMA cells, compared with in the cytosol, the nuclear GSSG/GSH ratio was 5-fold higher. Compared to the ratio observed in healthy murine aortic endothelial (MAE) cells, GSSG/GSH was over twice as high in EOMA cells. Multidrug resistance-associated protein-1 (MRP-1), an active GSSG efflux mechanism, showed 2-fold increased activity in EOMA compared with MAE cells. Hyperactive YB-1 and Ape/Ref-1 were responsible for high MRP-1 expression in EOMA. Proximity ligand assay demonstrated MRP-1 and YB-1 binding. Such binding enabled the nuclear targeting of MRP-1 in EOMA in a leptomycin-B-sensitive manner. MRP-1 inhibition as well as knockdown trapped nuclear GSSG, causing cell death of EOMA. Disulfide loading of cells by inhibition of GSSG reductase (bischoloronitrosourea) or thioredoxin reductase (auranofin) was effective in causing EOMA death as well. In sum, EOMA cells survive a heavy oxidant burden by rapid efflux of GSSG, which is lethal if trapped within the cell. A hyperactive MRP-1 system for GSSG efflux acts as a critical survival factor for these cells, making it a potential target for EOMA therapeutics.
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Affiliation(s)
- Gayle M Gordillo
- From the Department of Plastic Surgery, Davis Heart and Lung Research Institute, and
| | - Ayan Biswas
- From the Department of Plastic Surgery, Davis Heart and Lung Research Institute, and
| | - Savita Khanna
- Davis Heart and Lung Research Institute, and Department of Surgery
| | | | - Xueliang Pan
- Center for Biostatistics, Ohio State University Wexner Medical Center, Columbus, Ohio 43212
| | - Chandan K Sen
- Davis Heart and Lung Research Institute, and Department of Surgery
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Cai BL, Li Y, Shen LL, Zhao JL, Liu Y, Wu JZ, Liu YP, Yu B. Nuclear Multidrug Resistance-Related Protein 1 Is Highly Associated with Better Prognosis of Human Mucoepidermoid Carcinoma through the Suppression of Cell Proliferation, Migration and Invasion. PLoS One 2016; 11:e0148223. [PMID: 26829120 PMCID: PMC4734599 DOI: 10.1371/journal.pone.0148223] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Accepted: 01/14/2016] [Indexed: 11/18/2022] Open
Abstract
Objectives Multidrug resistance-related protein 1 (MRP1) overexpression is a well acknowledged predictor of poor response to chemotherapy, but MRP1 also correlated to better prognosis in some reports, especially for patients not pretreated with chemotherapy. In our previous study, we found nuclear translocation of MRP1 in mucoepidermoid carcinoma (MEC) for the first time. The purpose of this study was to further investigate the function of nuclear MRP1 in MEC. Materials and Methods Human MEC tissue samples of 125 patients were selected and stained using immunohistochemistry. The expression level of total MRP1/nuclear MRP1 of each sample was evaluated by expression index (EI) which was scored using both qualitative and quantitative analysis. The correlations between the clinicopathologic parameters and the EI of nuclear MRP1 were analyzed using Spearman’s rank correlation analysis, respectively. The effects of RNAi-mediated downregulation of nuclear MRP1 on MEC cells were assessed using flow cytometric analysis, MTT assay, plate colony formation assay, transwell invasion assay and monolayer wound healing assay. Results In this study, we found the EI of nuclear MRP1 was negatively correlated to the pathologic grading (r = -0.498, P<0.01) / clinical staging (r = -0.41, P<0.01) / tumor stage (r = -0.28, P = 0.02) / nodal stage (r = -0.29, P<0.01) of MEC patients. The RNAi-mediated downregulation of nuclear MRP1 further proved that the downregulation of nuclear MRP1 could increase the cell replication, growth speed, colony formation efficiency, migration and invasion ability of MEC cells. Conclusion Our results suggested that nuclear MRP1 is highly associated with better prognosis of human mucoepidermoid carcinoma and further study of its function mechanism would provide clues in developing new treatment modalities of MEC.
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Affiliation(s)
- Bo-Lei Cai
- State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi’an 710032, People's Republic of China
| | - Yan Li
- State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, the Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Liang-Liang Shen
- The State Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, the Fourth Military Medical University, Xi’an 710032, People's Republic of China
| | - Jin-Long Zhao
- State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi’an 710032, People's Republic of China
| | - Yuan Liu
- State Key Laboratory of Military Stomatology, Department of Oral Histology and Pathology, School of Stomatology, the Fourth Military Medical University, Xi’an 710032, People's Republic of China
| | - Jun-Zheng Wu
- State Key Laboratory of Military Stomatology, Department of Oral Biology, School of Stomatology, The Fourth Military Medical University, 145 Chang Le Xi Road, Xi’an 710032, People's Republic of China
| | - Yan-Pu Liu
- State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi’an 710032, People's Republic of China
- * E-mail: (BY); (YPL)
| | - Bo Yu
- State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, the Fourth Military Medical University, Xi’an 710032, People's Republic of China
- * E-mail: (BY); (YPL)
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Kreppel M, Scheer M, Meyer M, Stenner M, Wedemeyer I, Drebber U, Semrau R, Odenthal M, Zöller JE, Guntinas-Lichius O, Büttner R, Beutner D. Comparison of TNM-based stage grouping versus UICC/AJCC stage grouping (7th edition) in malignant parotid gland tumors. Oral Oncol 2013; 49:903-910. [DOI: 10.1016/j.oraloncology.2013.06.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 05/03/2013] [Accepted: 06/17/2013] [Indexed: 12/12/2022]
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Nuclear multidrug-resistance related protein 1 contributes to multidrug-resistance of mucoepidermoid carcinoma mainly via regulating multidrug-resistance protein 1: a human mucoepidermoid carcinoma cells model and Spearman's rank correlation analysis. PLoS One 2013; 8:e69611. [PMID: 24013781 PMCID: PMC3754958 DOI: 10.1371/journal.pone.0069611] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 06/11/2013] [Indexed: 12/28/2022] Open
Abstract
Background Multidrug resistance-related protein 1 (MRP1/ABCC1) and multidrug resistance protein 1 (MDR1/P-glycoprotein/ABCB1) are both membrane-bound drug transporters. In contrast to MDR1, MRP1 also transports glutathione (GSH) and drugs conjugated to GSH. Due to its extraordinary transport properties, MRP1/ABCC1 contributes to several physiological functions and pathophysiological incidents. We previously found that nuclear translocation of MRP1 contributes to multidrug-resistance (MDR) of mucoepidermoid carcinoma (MEC). The present study investigated how MRP1 contributes to MDR in the nuclei of MEC cells. Methods Western blot and RT-PCR was carried out to investigate the change of multidrug-resistance protein 1 (MDR1) in MC3/5FU cells after MRP1 was downregulated through RNA interference (RNAi). Immunohistochemistry (IHC) staining of 127 cases of MEC tissues was scored with the expression index (EI). The EI of MDR1 and MRP1 (or nuclear MRP1) was analyzed with Spearman's rank correlation analysis. Using multiple tumor tissue assays, the location of MRP1 in other tissues was checked by HIC. Luciferase reporter assays of MDR1 promoter was carried out to check the connection between MRP1 and MDR1 promoter. Results MRP1 downregulation led to a decreased MDR1 expression in MC3/5FU cells which was caused by decreased activity of MDR1 promoter. IHC study of 127 cases of MEC tissues demonstrated a strong positive correlation between nuclear MRP1 expression and MDR1 expression. Furthermore, IHC study of multiple tumor tissue array sections showed that although nuclear MRP1 widely existed in MEC tissues, it was not found in normal tissues or other tumor tissues. Conclusions Our findings indicate that nuclear MRP1 contributes to MDR mainly through regulating MDR1 expression in MEC. And the unique location of MRP1 made it an available target in identifying MEC from other tumors.
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Adams A, Warner K, Nör JE. Salivary gland cancer stem cells. Oral Oncol 2013; 49:845-853. [PMID: 23810400 DOI: 10.1016/j.oraloncology.2013.05.013] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 05/22/2013] [Accepted: 05/31/2013] [Indexed: 12/13/2022]
Abstract
Emerging evidence suggests the existence of a tumorigenic population of cancer cells that demonstrate stem cell-like properties such as self-renewal and multipotency. These cells, termed cancer stem cells (CSC), are able to both initiate and maintain tumor formation and progression. Studies have shown that CSC are resistant to traditional chemotherapy treatments preventing complete eradication of the tumor cell population. Following treatment, CSC are able to re-initiate tumor growth leading to patient relapse. Salivary gland cancers are relatively rare but constitute a highly significant public health issue due to the lack of effective treatments. In particular, patients with mucoepidermoid carcinoma or adenoid cystic carcinoma, the two most common salivary malignancies, have low long-term survival rates due to the lack of response to current therapies. Considering the role of CSC in resistance to therapy in other tumor types, it is possible that this unique sub-population of cells is involved in resistance of salivary gland tumors to treatment. Characterization of CSC can lead to better understanding of the pathobiology of salivary gland malignancies as well as to the development of more effective therapies. Here, we make a brief overview of the state-of-the-science in salivary gland cancer, and discuss possible implications of the cancer stem cell hypothesis to the treatment of salivary gland malignancies.
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Affiliation(s)
- April Adams
- Department of Restorative Sciences, University of Michigan School of Dentistry, United States
| | - Kristy Warner
- Department of Restorative Sciences, University of Michigan School of Dentistry, United States
| | - Jacques E Nör
- Department of Restorative Sciences, University of Michigan School of Dentistry, United States; Department of Biomedical Engineering, University of Michigan College of Engineering, United States; Department of Otolaryngology, University of Michigan School of Medicine, United States.
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ABCC2 is involved in the hepatocyte perinuclear barrier for small organic compounds. Biochem Pharmacol 2012; 84:1651-9. [PMID: 23041646 DOI: 10.1016/j.bcp.2012.09.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Revised: 09/17/2012] [Accepted: 09/18/2012] [Indexed: 12/16/2022]
Abstract
Small organic molecules are believed to freely diffuse across nuclear pores but this may not be so if this route is blocked during protein and nucleic acid transfer. Here we have investigated the existence of transport mechanisms across the nuclear envelope (NE) of hepatocytes. Using nuclei isolated from rat liver cells, evidence for the existence of ATP-dependent transporters of organic compounds was found. In rat hepatocyte NE, with negligible contamination by other membranes, the presence of mature and glycosylated ABCC2, but not other ABC export pumps, was detected. ABCC2 was localized in the same membranes as the conjugating enzyme UGT1A1. Human ABCC2 ORF was tagged with V5 and transfected to human hepatoma cells. ABCC2-V5 protein was detected at perinuclear ER vesicles and at the NE. Both compartments expressing ABCC2-V5 were able to exclude calcein. ABCC2 abundance at the NE of rat hepatocytes was modified by treatments able to increase or reduce the expression of canalicular ABCC2. The sensitivity to mitoxantrone was higher for hepatocytes obtained from TR- rats whose NE lacked ABCC2. Incubation with mitoxantrone after depletion of ATP resulted in a marked accumulation of mitoxantrone in the nucleus of wild-type, but not TR-, hepatocytes. In sum, ABCC2 is present at the NE and perinuclear ER where, in combination with the activity of conjugating enzymes, this pump may be involved in the perinuclear barrier for small organic molecules, playing a role in protecting DNA from genotoxic compounds and in the control of intranuclear concentrations of ligands for nuclear receptors.
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