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Zhu X, Ren J, Xu D, Cheng D, Wang W, Ren J, Xiao Z, Jiang H, Ding Y, Tan Y. Upregulation of Translationally Controlled Tumor Protein Is Associated With Cervical Cancer Progression. Front Mol Biosci 2021; 8:686718. [PMID: 34589516 PMCID: PMC8473787 DOI: 10.3389/fmolb.2021.686718] [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: 03/27/2021] [Accepted: 08/11/2021] [Indexed: 12/24/2022] Open
Abstract
Outside a few affluent countries with adequate vaccination and screening coverage, cervical cancer remains the leading cause of cancer-related deaths in women in many countries. Currently, a major problem is that a substantial proportion of patients are already at an advanced cancer stage when diagnosed. There is increasing evidence that indicates the involvement of translationally controlled tumor protein 1 (TPT1) overexpression in cancer development, but little is known about its implication in cervical cancer. We assessed the levels of TPT1 in surgical tissue and sera of patients with cervicitis, cervical intraepithelial neoplasia III, and cervical cancer, as well as in normal and cancerous cervical cell lines. Gene sets, pathways, and functional protein interactions associated with TPT1 were identified using the TCGA data cohort of cervical cancer. We found that the TPT1 expression was significantly increased in cervical cancer tissue compared to all nonmalignant cervical tissues, including samples of cervicitis, cervical intraepithelial neoplasia III, and normal controls. Serum level of TPT1 was also increased in cervical cancer patients compared to healthy subjects. Furthermore, elevated TPT1 expression was significantly correlated with lymph node metastasis and a low differentiation degree of the cancer. In the cancerous tissues and cell lines, selective markers of PI3K/AKT/mTOR pathway over-activation, apoptosis repression, and EMT were detected, and their interaction with TPT1 was supported by biometrics analyses. Our results, for the first time, demonstrate a strong correlation of upregulated TPT1 expression with cervical cancer progression, suggesting that TPT1 might provide a potential biomarker for cervical cancer progression.
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Affiliation(s)
- Xiaoyu Zhu
- School of Laboratory Medicine, Guizhou Medical University, Guiyang, China
| | - Ji Ren
- School of Laboratory Medicine, Guizhou Medical University, Guiyang, China
| | - Dianqin Xu
- Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Di Cheng
- Affiliated Oncology Hospital of Guizhou Medical University, Guiyang, China
| | - Wei Wang
- Affiliated Oncology Hospital of Guizhou Medical University, Guiyang, China
| | - Jie Ren
- Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Ziwen Xiao
- Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Hongmei Jiang
- School of Laboratory Medicine, Guizhou Medical University, Guiyang, China
| | - Yan Ding
- Taihe Hospital, Affiliated to Hubei Medical University, Shiyan, China
| | - Yujie Tan
- School of Laboratory Medicine, Guizhou Medical University, Guiyang, China.,Affiliated Hospital of Guizhou Medical University, Guiyang, China
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2
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Oliveira MP, Prates J, Gimenes AD, Correa SG, Oliani SM. Annexin A1 Mimetic Peptide Ac 2-26 Modulates the Function of Murine Colonic and Human Mast Cells. Front Immunol 2021; 12:689484. [PMID: 34557187 PMCID: PMC8452975 DOI: 10.3389/fimmu.2021.689484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 08/19/2021] [Indexed: 12/17/2022] Open
Abstract
Mast cells (MCs) are main effector cells in allergic inflammation and after activation, they release stored (histamine, heparin, proteases) and newly synthesized (lipid mediators and cytokines) substances. In the gastrointestinal tract the largest MC population is located in the lamina propria and submucosa whereas several signals such as the cytokine IL-4, seem to increase the granule content and to stimulate a remarkable expansion of intestinal MCs. The broad range of MC-derived bioactive molecules may explain their involvement in many different allergic disorders of the gastrointestinal tract. Annexin A1 (AnxA1) is a 37 KDa glucocorticoid induced monomeric protein selectively distributed in certain tissues. Its activity can be reproduced by mimetic peptides of the N-terminal portion, such as Ac2-26, that share the same receptor FPR-L1. Although previous reports demonstrated that AnxA1 inhibits MC degranulation in murine models, the effects of exogenous peptide Ac2-26 on intestinal MCs or the biological functions of the Ac2-26/FPR2 system in human MCs have been poorly studied. To determine the effects of Ac2-26 on the function of MCs toward the possibility of AnxA1-based therapeutics, we treated WT and IL-4 knockout mice with peptide Ac2-26, and we examined the spontaneous and compound 48/80 stimulated colonic MC degranulation and cytokine production. Moreover, in vitro, using human mast cell line HMC-1 we demonstrated that exogenous AnxA1 peptide is capable of interfering with the HMC-1 degranulation in a direct pathway through formyl peptide receptors (FPRs). We envisage that our results can provide therapeutic strategies to reduce the release of MC mediators in inflammatory allergic processes.
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Affiliation(s)
- Marcia Pereira Oliveira
- Laboratory of Interdisciplinary Medical Research, Oswaldo Cruz Institute, Fiocruz, Rio de Janeiro, Brazil
| | - Janesly Prates
- Department of Biology, Institute of Bioscience, Humanities and Exact Science, São Paulo State University (Unesp), São José do Rio Preto, Brazil
| | | | - Silvia Graciela Correa
- Departamento de Bioquímica Clinica-Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI - CONICET) - Facultad de Ciencias Quimicas- Universidad Nacional de Córdoba (UNC), Córdoba, Argentina
| | - Sonia Maria Oliani
- Department of Biology, Institute of Bioscience, Humanities and Exact Science, São Paulo State University (Unesp), São José do Rio Preto, Brazil
- Advanced Research Center in Medicine, CEPAM –Unilago, São José do Rio Preto, Brazil
- Federal University of São Paulo, Post Graduate Program in Structural and Functional Biology, Escola Paulista de Medicina (Unifesp-EPM), São Paulo, Brazil
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Prates J, Moreli JB, Gimenes AD, Biselli JM, Pires D'Avila SCG, Sandri S, Farsky SHP, Rodrigues-Lisoni FC, Oliani SM. Cisplatin treatment modulates Annexin A1 and inhibitor of differentiation to DNA 1 expression in cervical cancer cells. Biomed Pharmacother 2020; 129:110331. [PMID: 32768930 DOI: 10.1016/j.biopha.2020.110331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/19/2020] [Accepted: 05/23/2020] [Indexed: 02/07/2023] Open
Abstract
Cisplatin (Cis) is a choice chemotherapy approach to cervical cancer by inducing DNA adducts and subsequent apoptosis. We have investigated the effects of Cis on Annexin A1 (ANXA1) and inhibitor of DNA binding 1 (ID1) proteins expression to elucidate further mechanisms of Cis actions. Human cervical tissue samples from twenty-four patients, with Cervical Intraepithelial Neoplasia (CIN, stage I, II and III), were evaluated to quantified ANXA1 and ID1 expressions. In vitro, human epidermoid carcinoma of the cervix (SiHa cell line) were treated with Annexin A1 peptide (ANXA12-26), Cis or Cis + ANXA12-26 to evaluate cell proliferation and migration, cytotoxicity of treatments as well as ANXA1 and ID1 modulations by mRNA and protein expression. Our findings showed expression of ID1 and ANXA1 proteins in tissue samples from Cervical Intraepithelial Neoplasia (CIN) patients, with intense immunological identification of ID1 in the CIN III stage. In SiHa cells, treatments with Cis alone or Cis + ANXA12-26, increase mRNA expressions of the ANXA1 and reduced the ID1. In agreement, Cis + ANXA12-26 enhanced ANXA1 protein expression and Cis or Cis + ANXA12-26 abolished ID1 protein expression. Cell proliferation was reduced after treatment with ANXA12-26 peptide and more significant after Cis or Cis + ANXA12-26 treatments. These two last treatments reduced cell viability, by inducing late apoptosis, and impaired cell migration. Together, our data highlight endogenous ANXA1 is involved in Cis therapy for cervical cancer.
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Affiliation(s)
- Janesly Prates
- São Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences (Ibilce), Campus São José do Rio Preto, SP, Brazil
| | - Jusciéle Brogin Moreli
- Universidade Federal de São Paulo - UNIFESP, Post-Graduation in Structural and Functional Biology, SP, Brazil; Faceres School of Medicine, São José do Rio Preto, SP, Brazil
| | - Alexandre Dantas Gimenes
- Universidade Federal de São Paulo - UNIFESP, Post-Graduation in Structural and Functional Biology, SP, Brazil
| | - Joice Matos Biselli
- São Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences (Ibilce), Campus São José do Rio Preto, SP, Brazil
| | | | - Silvana Sandri
- São Paulo University (USP), Department of Clinical and Toxicological Analysis, Faculty of Pharmaceutical Sciences, São Paulo, Brazil
| | - Sandra Helena Poliselli Farsky
- São Paulo University (USP), Department of Clinical and Toxicological Analysis, Faculty of Pharmaceutical Sciences, São Paulo, Brazil
| | - Flávia Cristina Rodrigues-Lisoni
- São Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences (Ibilce), Campus São José do Rio Preto, SP, Brazil; São Paulo State University (Unesp), Ilha Solteira School of Engineering (FEIS), Campus Ilha Solteira, SP, Brazil
| | - Sonia Maria Oliani
- São Paulo State University (Unesp), Institute of Biosciences, Humanities and Exact Sciences (Ibilce), Campus São José do Rio Preto, SP, Brazil; Universidade Federal de São Paulo - UNIFESP, Post-Graduation in Structural and Functional Biology, SP, Brazil.
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Zhao Z, Bo Z, Gong W, Guo Y. Inhibitor of Differentiation 1 (Id1) in Cancer and Cancer Therapy. Int J Med Sci 2020; 17:995-1005. [PMID: 32410828 PMCID: PMC7211148 DOI: 10.7150/ijms.42805] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 03/20/2020] [Indexed: 02/07/2023] Open
Abstract
The inhibitor of DNA binding (Id) proteins are regulators of cell cycle and cell differentiation. Of all Id family proteins, Id1 is mostly linked to tumorigenesis, cellular senescence as well as cell proliferation and survival. Id1 is a stem cell-like gene more than a classical oncogene. Id1 is overexpressed in numerous types of cancers and exerts its promotion effect to these tumors through different pathways. Briefly, Id1 was found significantly correlated with EMT-related proteins, K-Ras signaling, EGFR signaling, BMP signaling, PI3K/Akt signaling, WNT and SHH signaling, c-Myc signaling, STAT3 signaling, RK1/2 MAPK/Egr1 pathway and TGF-β pathway, etc. Id1 has potent effect on facilitating tumorous angiogenesis and metastasis. Moreover, high expression of Id1 plays a facilitating role in the development of drug resistance, including chemoresistance, radiation resistance and resistance to drugs targeting angiogenesis. However, controversial results were also obtained. Overall, Id1 represent a promising target of anti-tumor therapeutics based on its potent promotion effect to cancer. Numerous drugs were found exerting their anti-tumor function through Id1-related signaling pathways, such as fucoidan, berberine, tetramethylpyrazine, crizotinib, cannabidiol and vinblastine.
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Affiliation(s)
- Zhengxiao Zhao
- Department of Oncology, the First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, China
| | - Zhiyuan Bo
- The Second Department of Biliary Tract Surgery, Shanghai Eastern Hepatobiliary Surgery Hospital, Shanghai 200438, China
| | - Weiyi Gong
- The Department of Integrative Medicine, Huashan Hospital, Fudan University, 12 Middle Urumqi Road, Shanghai 200040, PR China
| | - Yong Guo
- Department of Oncology, the First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, China
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Cardin LT, Prates J, da Cunha BR, Tajara EH, Oliani SM, Rodrigues‐Lisoni FC. Annexin A1 peptide and endothelial cell-conditioned medium modulate cervical tumorigenesis. FEBS Open Bio 2019; 9:668-681. [PMID: 30984541 PMCID: PMC6443877 DOI: 10.1002/2211-5463.12603] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 12/17/2018] [Accepted: 01/21/2019] [Indexed: 01/01/2023] Open
Abstract
Cervical cancer is one of the leading causes of cancer death in women worldwide, and its tumorigenesis can be influenced by the microenvironment. The anti-inflammatory protein annexin A1 (ANXA1) has been reported to be associated with cancer progression and metastasis, suggesting that it plays a role in regulating tumour cell proliferation. Here, we examined the effect of the N-terminal peptide Ac2-26 of ANXA1 on the HaCaT cell line (normal) and HeLa cell line (cervical cancer) co-cultured with endothelium cell-conditioned medium (HMC). Treatment with Ac2-26 decreased proliferation and increased motility of cervical cancer cells, but did not affect cellular morphology or viability. Combined HMC stimulus and Ac2-26 treatment resulted in an increase in apoptotic HeLa cells, upregulated expression of MMP2, and downregulated expression of COX2,EP3 and EP4. In conclusion, Ac2-26 treatment may modulate cellular and molecular mechanisms underlying cervical carcinogenesis.
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Affiliation(s)
- Laila Toniol Cardin
- Institute of Bioscience, Humanities and Exact ScienceSão Paulo State University (Unesp)São José do Rio PretoBrazil
| | - Janesly Prates
- Institute of Bioscience, Humanities and Exact ScienceSão Paulo State University (Unesp)São José do Rio PretoBrazil
| | - Bianca Rodrigues da Cunha
- Department of Molecular BiologySchool of Medicine of São José do Rio PretoSão José do Rio PretoBrazil
| | - Eloiza Helena Tajara
- Department of Molecular BiologySchool of Medicine of São José do Rio PretoSão José do Rio PretoBrazil
| | - Sonia Maria Oliani
- Institute of Bioscience, Humanities and Exact ScienceSão Paulo State University (Unesp)São José do Rio PretoBrazil
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Al-Thawadi H, Ghabreau L, Aboulkassim T, Yasmeen A, Vranic S, Batist G, Al Moustafa AE. Co-Incidence of Epstein-Barr Virus and High-Risk Human Papillomaviruses in Cervical Cancer of Syrian Women. Front Oncol 2018; 8:250. [PMID: 30035100 PMCID: PMC6043788 DOI: 10.3389/fonc.2018.00250] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 06/19/2018] [Indexed: 12/23/2022] Open
Abstract
Epstein-Barr virus (EBV) has been recently shown to be co-present with high-risk human papillomaviruses (HPVs) in human cervical cancer; thus, these oncoviruses play an important role in the initiation and/or progression of this cancer. Accordingly, our group has recently viewed the presence and genotyping distribution of high-risk HPVs in cervical cancer in Syrian women; our data pointed out that HPVs are present in 42/44 samples (95%). Herein, we aim to explore the co-prevalence of EBV and high-risk HPVs in 44 cervical cancer tissues from Syrian women using polymerase chain reaction, immunohistochemistry, and tissue microarray analyses. We found that EBV and high-risk HPVs are co-present in 15/44 (34%) of the samples. However, none of the samples was exclusively EBV-positive. Additionally, we report that the co-expression of LMP1 and E6 genes of EBV and high-risk HPVs, respectively, is associated with poorly differentiated squamous cell carcinomas phenotype; this is accompanied by a strong and diffuse overexpression of Id-1 (93% positivity), which is an important regulator of cell invasion and metastasis. These data imply that EBV and HPVs are co-present in cervical cancer samples in the Middle East area including Syria and their co-presence is associated with a more aggressive cancer phenotype. Future investigations are needed to elucidate the exact role of EBV and HPVs cooperation in cervical carcinogenesis.
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Affiliation(s)
| | - Lina Ghabreau
- Faculty of Medicine, Pathology Department, University of Aleppo, Aleppo, Syria.,Syrian Research Cancer Centre of the Syrian Society against Cancer, Aleppo, Syria
| | - Tahar Aboulkassim
- Segal Cancer Centre, Lady Davis Institute for Medical Research of the Sir Mortimer B. Davis-Jewish General Hospital, Montreal, QC, Canada
| | - Amber Yasmeen
- Segal Cancer Centre, Lady Davis Institute for Medical Research of the Sir Mortimer B. Davis-Jewish General Hospital, Montreal, QC, Canada
| | - Semir Vranic
- College of Medicine, Qatar University, Doha, Qatar
| | - Gerald Batist
- Segal Cancer Centre, Lady Davis Institute for Medical Research of the Sir Mortimer B. Davis-Jewish General Hospital, Montreal, QC, Canada.,Oncology Department, McGill University, Montreal, QC, Canada
| | - Ala-Eddin Al Moustafa
- College of Medicine, Qatar University, Doha, Qatar.,Syrian Research Cancer Centre of the Syrian Society against Cancer, Aleppo, Syria.,Oncology Department, McGill University, Montreal, QC, Canada.,College of Medicine and Biomedical Research Centre of Qatar University, Doha, Qatar
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de Campos RP, Schultz IC, de Andrade Mello P, Davies S, Gasparin MS, Bertoni APS, Buffon A, Wink MR. Cervical cancer stem-like cells: systematic review and identification of reference genes for gene expression. Cell Biol Int 2018; 42:139-152. [PMID: 28949053 DOI: 10.1002/cbin.10878] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 09/24/2017] [Indexed: 12/21/2022]
Abstract
Cervical cancer is the fourth most common cancer affecting women worldwide. Among many factors, the presence of cancer stem cells, a subpopulation of cells inside the tumor, has been associated with a worse prognosis. Considering the importance of gene expression studies to understand the biology of cervical cancer stem cells (CCSC), this work identifies stable reference genes for cervical cancer cell lines SiHa, HeLa, and ME180 as well as their respective cancer stem-like cells. A literature review was performed to identify validated reference genes currently used to normalize RT-qPCR data in cervical cancer cell lines. Then, cell lines were cultured in regular monolayer or in a condition that favors tumor sphere formation. RT-qPCR was performed using five reference genes: ACTB, B2M, GAPDH, HPRT1, and TBP. Stability was assessed to validate the selected genes as suitable reference genes. The evaluation validated B2M, GAPDH, HPRT1, and TBP in these experimental conditions. Among them, GAPDH and TBP presented the lowest variability according to the analysis by Normfinder, Bestkeeper, and ΔCq methods, being therefore the most adequate genes to normalize the combination of all samples. These results suggest that B2M, GAPDH, HPRT1, and TBP are suitable reference genes to normalize RT-qPCR data of established cervical cancer cell lines SiHa, HeLa, and ME180 as well as their derived cancer stem-like cells. Indeed, GAPDH and TBP seem to be the most convenient choices for studying gene expression in these cells in monolayers or spheres.
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Affiliation(s)
- Rafael P de Campos
- Laboratório de Biologia Celular, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre 90050-170, Rio Grande do Sul, Brazil
| | - Iago C Schultz
- Laboratório de Biologia Celular, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre 90050-170, Rio Grande do Sul, Brazil
| | - Paola de Andrade Mello
- Laboratório de Biologia Celular, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre 90050-170, Rio Grande do Sul, Brazil
- Laboratório de Análises Bioquímicas e Citológicas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90610-000, Rio Grande do Sul, Brazil
| | - Samuel Davies
- Laboratório de Análises Bioquímicas e Citológicas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90610-000, Rio Grande do Sul, Brazil
| | - Manuela S Gasparin
- Laboratório de Biologia Celular, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre 90050-170, Rio Grande do Sul, Brazil
- Laboratório de Análises Bioquímicas e Citológicas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90610-000, Rio Grande do Sul, Brazil
| | - Ana P S Bertoni
- Laboratório de Biologia Celular, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre 90050-170, Rio Grande do Sul, Brazil
| | - Andréia Buffon
- Laboratório de Análises Bioquímicas e Citológicas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 90610-000, Rio Grande do Sul, Brazil
| | - Márcia R Wink
- Laboratório de Biologia Celular, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre 90050-170, Rio Grande do Sul, Brazil
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ANXA1Ac2–26 peptide, a possible therapeutic approach in inflammatory ocular diseases. Gene 2017; 614:26-36. [DOI: 10.1016/j.gene.2017.02.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 02/14/2017] [Accepted: 02/27/2017] [Indexed: 02/08/2023]
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Ioannou MS, McPherson PS. Regulation of Cancer Cell Behavior by the Small GTPase Rab13. J Biol Chem 2016; 291:9929-37. [PMID: 27044746 DOI: 10.1074/jbc.r116.715193] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The members of the Rab family of GTPases are master regulators of cellular membrane trafficking. With ∼70 members in humans, Rabs have been implicated in all steps of membrane trafficking ranging from vesicle formation and transport to vesicle docking/tethering and fusion. Vesicle trafficking controls the localization and levels of a myriad of proteins, thus regulating cellular functions including proliferation, metabolism, cell-cell adhesion, and cell migration. It is therefore not surprising that impairment of Rab pathways is associated with diseases including cancer. In this review, we highlight evidence supporting the role of Rab13 as a potent driver of cancer progression.
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Affiliation(s)
- Maria S Ioannou
- From the Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Peter S McPherson
- From the Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada
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