1
|
Chai T, Yue W, Xu P, Gildea J, Felder R. Caveolin-1, a Determinant of the Fate of MCF-7 Breast Cancer Cells. Breast Cancer (Auckl) 2024; 18:11782234241226802. [PMID: 38298330 PMCID: PMC10829489 DOI: 10.1177/11782234241226802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 12/21/2023] [Indexed: 02/02/2024] Open
Abstract
Background The scaffolding protein, caveolin-1 (Cav-1), participates in multiple cellular functions including promotion of sodium excretion from the kidney. Loss of expression of Cav-1 is associated with tumorigenesis of various types of cancer. We have shown the potential link between hypertension and breast cancer via abnormal function of the G protein-coupled receptor kinase type 4 (GRK4). Objective The current studies tested the hypothesis that Cav-1 acts as a tumor-suppressive factor in breast cancer cells and enhances the sensitivity to the inhibitory effect of the type 1 dopaminergic receptor (D1R). Methods Michigan Cancer Foundation (MCF) MCF-7 cells stably expressing a Cav-1/mCherry fusion protein or mCherry alone were used as models to examine the effect of Cav-1 on cell growth, apoptosis, and senescence. Cell proliferation was determined by cell counting, cell cycle analysis (flow cytometry), and BrdU incorporation. Apoptosis was determined using the Cell Death Detection ELISA kit from Roche Diagnosis. Senescence was determined using the senescence associated beta galactosidase (SA-β-gal) assay. Reactive oxygen species (ROS) was measured using 2',7'-dichlorodihydrofluorescein diacetate. Western blot analysis was used to measure activation of signaling pathway molecules. All statistical analyses were conducted with Microsoft Excel. Results Overexpression of Cav-1 in MCF-7 cells reduced cellular growth rate. Both inhibition of proliferation and induction of cell death are contributing factors. Multiple signaling pathways were activated in Cav-1-expressing MCF-7 cells. Activation of Akt was prominent. In MCF-7-expressing Cav-1 (MCF-7 Cav-1) cells, the levels of phosphorylated Akt at S473 and T308 were increased 28- and 8.7-fold, respectively. Instead of protecting cells from apoptosis, extremely high levels of activated Akt resulted in increased levels of ROS which led to apoptosis and senescence. The tumor-suppressive effect plus downregulation of GRK4 makes Cav-1-expressing MCF-7 cells significantly more sensitive to the inhibitory effect of the D1R agonist, SKF38393. Conclusion Caveolin-1 acts as a tumor-suppressing factor via extreme activation of Akt and down regulation of survival factors such as GRK4, survivin, and cyclin D1.
Collapse
Affiliation(s)
- Tina Chai
- Department of Pathology, University of Virginia Health System, University of Virginia, Charlottesville, VA, USA
| | - Wei Yue
- Department of Pathology, University of Virginia Health System, University of Virginia, Charlottesville, VA, USA
| | - Peng Xu
- Department of Pathology, University of Virginia Health System, University of Virginia, Charlottesville, VA, USA
| | - John Gildea
- Department of Pathology, University of Virginia Health System, University of Virginia, Charlottesville, VA, USA
| | - Robin Felder
- Department of Pathology, University of Virginia Health System, University of Virginia, Charlottesville, VA, USA
| |
Collapse
|
2
|
Tambe P, Salve R, Choudhary P, Kumar P, Jadhav S, Paknikar KM, Gajbhiye V. Targeted silencing of the MCL-1 gene using multi-layered dendrimer-based nanoconstructs achieves efficient tumor regression in xenografted mice models. Int J Pharm 2023; 634:122659. [PMID: 36720446 DOI: 10.1016/j.ijpharm.2023.122659] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 01/18/2023] [Accepted: 01/27/2023] [Indexed: 02/02/2023]
Abstract
The setback in the practical clinical use of RNA interference (RNAi)-based cancer treatment stems from the lack of targeted small interfering RNA (siRNA) delivery. Here, we show that luteinizing hormone-releasing hormone(LHRH) analog-tethered multi-layered polyamidoamine (PAMAM) nanoconstructs silence the anti-apoptotic MCL-1 gene in LHRH receptor overexpressing human breast (MCF-7) and prostate cancer (LNCaP) cells with 70.91 % and 74.10 % efficiency, respectively. These results were confirmed by RT-PCR. The Acridine orange/Ethidium bromide (AO/EB) dual staining revealed that the silencing of MCL-1 induced apoptosis in both the cell lines. In vivo tumor regression studies performed using MCF-7 and LNCaP xenografted severe combined immunodeficiency(SCID) mice demonstrated highly improved tumor regression in groups treated with targeted nanoconstructs complexed with MCL-1 siRNA (T + siMCL-1) compared to the other treatment groups. The quantitative RT-PCR results of tumor tissues demonstrated significant MCL-1 gene silencing, i.e., 73.76 % and 92.63 % in breast and prostate tumors, respectively, after T + siMCL-1 treatment. Reduction in MCL-1 protein expression as assessed by immunohistochemistry further confirmed these results. Furthermore, the caspase 3/7 assay demonstrated apoptosis in the MCL-1 silenced tissues. The study strongly suggests that targeted delivery of siRNAs using multi-layered dendrimer nanostructures could be an effective therapy for LHRH overexpressing cancers.
Collapse
Affiliation(s)
- Prajakta Tambe
- Nanobioscience, Agharkar Research Institute, Pune 411 004, India; Savitribai Phule Pune University, Ganeshkhind, Pune 411 007, India
| | - Rajesh Salve
- Nanobioscience, Agharkar Research Institute, Pune 411 004, India; Savitribai Phule Pune University, Ganeshkhind, Pune 411 007, India
| | - Prakash Choudhary
- Nanobioscience, Agharkar Research Institute, Pune 411 004, India; Savitribai Phule Pune University, Ganeshkhind, Pune 411 007, India
| | - Pramod Kumar
- Nanobioscience, Agharkar Research Institute, Pune 411 004, India; Savitribai Phule Pune University, Ganeshkhind, Pune 411 007, India
| | - Sachin Jadhav
- Nanobioscience, Agharkar Research Institute, Pune 411 004, India; Savitribai Phule Pune University, Ganeshkhind, Pune 411 007, India
| | - Kishore M Paknikar
- Nanobioscience, Agharkar Research Institute, Pune 411 004, India; Indian Institute of Technology, Powai, Mumbai 400 076, India.
| | - Virendra Gajbhiye
- Nanobioscience, Agharkar Research Institute, Pune 411 004, India; Savitribai Phule Pune University, Ganeshkhind, Pune 411 007, India.
| |
Collapse
|
3
|
Zacchini F, Venturi G, De Sanctis V, Bertorelli R, Ceccarelli C, Santini D, Taffurelli M, Penzo M, Treré D, Inga A, Dassi E, Montanaro L. Human dyskerin binds to cytoplasmic H/ACA-box-containing transcripts affecting nuclear hormone receptor dependence. Genome Biol 2022; 23:177. [PMID: 35996163 PMCID: PMC9394076 DOI: 10.1186/s13059-022-02746-3] [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: 12/23/2021] [Accepted: 08/11/2022] [Indexed: 12/05/2022] Open
Abstract
Background Dyskerin is a nuclear protein involved in H/ACA box snoRNA-guided uridine modification of RNA. In humans, its defective function is associated with cancer development and induces specific post-transcriptional alterations of gene expression. In this study, we seek to unbiasedly identify mRNAs regulated by dyskerin in human breast cancer-derived cells. Results We find that dyskerin depletion affects the expression and the association with polysomes of selected mRNA isoforms characterized by the retention of H/ACA box snoRNA-containing introns. These snoRNA retaining transcripts (snoRTs) are bound by dyskerin in the cytoplasm in the form of shorter 3′ snoRT fragments. We then characterize the whole cytoplasmic dyskerin RNA interactome and find both H/ACA box snoRTs and protein-coding transcripts which may be targeted by the snoRTs’ guide properties. Since a fraction of these protein-coding transcripts is involved in the nuclear hormone receptor binding, we test to see if this specific activity is affected by dyskerin. Obtained results indicate that dyskerin dysregulation may alter the dependence on nuclear hormone receptor ligands in breast cancer cells. These results are paralleled by consistent observations on the outcome of primary breast cancer patients stratified according to their tumor hormonal status. Accordingly, experiments in nude mice show that the reduction of dyskerin levels in estrogen-dependent cells favors xenograft development in the absence of estrogen supplementation. Conclusions Our work suggests a cytoplasmic function for dyskerin which could affect mRNA post-transcriptional networks relevant for nuclear hormone receptor functions. Supplementary Information The online version contains supplementary material available at 10.1186/s13059-022-02746-3.
Collapse
Affiliation(s)
- Federico Zacchini
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale (DIMES), Alma Mater Studiorum - Università di Bologna, I-40138, Bologna, Italy.,Centro di Ricerca Biomedica Applicata - CRBA, Università̀ di Bologna, Policlinico di Sant'Orsola, I-40138, Bologna, Italy
| | - Giulia Venturi
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale (DIMES), Alma Mater Studiorum - Università di Bologna, I-40138, Bologna, Italy.,Centro di Ricerca Biomedica Applicata - CRBA, Università̀ di Bologna, Policlinico di Sant'Orsola, I-40138, Bologna, Italy
| | - Veronica De Sanctis
- Dipartimento di Biologia Cellulare, Computazionale e Integrata (CIBIO), Università di Trento, I-38123, Trento, Italy
| | - Roberto Bertorelli
- Dipartimento di Biologia Cellulare, Computazionale e Integrata (CIBIO), Università di Trento, I-38123, Trento, Italy
| | - Claudio Ceccarelli
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale (DIMES), Alma Mater Studiorum - Università di Bologna, I-40138, Bologna, Italy.,Unità Operativa di Anatomia e Istologia Patologica, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, I-40138, Bologna, Italy
| | - Donatella Santini
- Unità Operativa di Anatomia e Istologia Patologica, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, I-40138, Bologna, Italy
| | - Mario Taffurelli
- Unità Operativa di Chirurgia Senologica, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, I-40138, Bologna, Italy.,Dipartimento di Scienze Mediche e Chirurgiche (DIMEC), Alma Mater Studiorum - Università di Bologna, I-40138, Bologna, Italy
| | - Marianna Penzo
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale (DIMES), Alma Mater Studiorum - Università di Bologna, I-40138, Bologna, Italy.,Centro di Ricerca Biomedica Applicata - CRBA, Università̀ di Bologna, Policlinico di Sant'Orsola, I-40138, Bologna, Italy
| | - Davide Treré
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale (DIMES), Alma Mater Studiorum - Università di Bologna, I-40138, Bologna, Italy.,Departmental Program in Laboratory Medicine, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, I-40138, Bologna, Italy
| | - Alberto Inga
- Dipartimento di Biologia Cellulare, Computazionale e Integrata (CIBIO), Università di Trento, I-38123, Trento, Italy
| | - Erik Dassi
- Dipartimento di Biologia Cellulare, Computazionale e Integrata (CIBIO), Università di Trento, I-38123, Trento, Italy
| | - Lorenzo Montanaro
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale (DIMES), Alma Mater Studiorum - Università di Bologna, I-40138, Bologna, Italy. .,Departmental Program in Laboratory Medicine, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Via Albertoni 15, I-40138, Bologna, Italy.
| |
Collapse
|
4
|
Identification of intracellular cavin target proteins reveals cavin-PP1alpha interactions regulate apoptosis. Nat Commun 2019; 10:3279. [PMID: 31332168 PMCID: PMC6646387 DOI: 10.1038/s41467-019-11111-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 06/14/2019] [Indexed: 12/20/2022] Open
Abstract
Caveolae are specialized domains of the plasma membrane. Formation of these invaginations is dependent on the expression of Caveolin-1 or -3 and proteins of the cavin family. In response to stress, caveolae disassemble and cavins are released from caveolae, allowing cavins to potentially interact with intracellular targets. Here, we describe the intracellular (non-plasma membrane) cavin interactome using biotin affinity proteomics and mass spectrometry. We validate 47 potential cavin-interactor proteins using a cell-free expression system and protein-protein binding assays. These data, together with pathway analyses, reveal unknown roles for cavin proteins in metabolism and stress signaling. We validated the interaction between one candidate interactor protein, protein phosphatase 1 alpha (PP1α), and Cavin-1 and -3 and show that UV treatment causes release of Cavin3 from caveolae allowing interaction with, and inhibition of, PP1α. This interaction increases H2AX phosphorylation to stimulate apoptosis, identifying a pro-apoptotic signaling pathway from surface caveolae to the nucleus.
Collapse
|
5
|
Wang R, Li Z, Guo H, Shi W, Xin Y, Chang W, Huang T. Caveolin 1 knockdown inhibits the proliferation, migration and invasion of human breast cancer BT474 cells. Mol Med Rep 2014; 9:1723-8. [PMID: 24604116 DOI: 10.3892/mmr.2014.2018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 02/13/2014] [Indexed: 11/06/2022] Open
Abstract
Previous studies have demonstrated that caveolin 1 acts as a tumor suppressor in breast cancer, however, few studies have demonstrated that caveolin 1 also serves as a tumor promoter in breast cancer. In the present study, caveolin 1 small interfering RNA was used to knock down caveolin 1 expression in order to investigate the association between caveolin 1 and the proliferation and metastatic abilities of human breast cancer BT474 cells. The results revealed that cell proliferation, migration and invasion were attenuated by caveolin 1 knockdown in BT474 cells. Furthermore, caveolin 1 knockdown in BT474 cells arrested cells in the G0/G1 phase and decreased the number of cells in the S phase. In addition, caveolin 1 knockdown decreased the activation of the extracellular signal-regulated kinase 1/2 pathway and inhibited the expression of cell cycle-associated proteins (cyclin D1, c-Fos and β-catenin), whilst the expression of E-cadherin was increased. Furthermore, the protein expression of matrix metalloproteinase-2, -9 and -1 was also inhibited by caveolin 1 knockdown. In combination, these results demonstrated that caveolin 1 knockdown had a tumor suppressing effect on BT474 cells.
Collapse
Affiliation(s)
- Rui Wang
- Department of Breast and Thyroid Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Zhi Li
- Department of Breast and Thyroid Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Hui Guo
- Department of Breast and Thyroid Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Wei Shi
- Department of Breast and Thyroid Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Yue Xin
- Department of Breast and Thyroid Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Weilong Chang
- Department of General Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Tao Huang
- Department of Breast and Thyroid Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| |
Collapse
|
6
|
Sisci D, Maris P, Cesario MG, Anselmo W, Coroniti R, Trombino GE, Romeo F, Ferraro A, Lanzino M, Aquila S, Maggiolini M, Mauro L, Morelli C, Andò S. The estrogen receptor α is the key regulator of the bifunctional role of FoxO3a transcription factor in breast cancer motility and invasiveness. Cell Cycle 2013; 12:3405-20. [PMID: 24047697 DOI: 10.4161/cc.26421] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The role of the Forkhead box class O (FoxO)3a transcription factor in breast cancer migration and invasion is controversial. Here we show that FoxO3a overexpression decreases motility, invasiveness, and anchorage-independent growth in estrogen receptor α-positive (ERα+) cancer cells while eliciting opposite effects in ERα-silenced cells and in ERα-negative (ERα-) cell lines, demonstrating that the nuclear receptor represents a crucial switch in FoxO3a control of breast cancer cell aggressiveness. In ERα+ cells, FoxO3a-mediated events were paralleled by a significant induction of Caveolin-1 (Cav1), an essential constituent of caveolae negatively associated to tumor invasion and metastasis. Cav1 induction occurs at the transcriptional level through FoxO3a binding to a Forkhead responsive core sequence located at position -305/-299 of the Cav1 promoter. 17β-estradiol (E2) strongly emphasized FoxO3a effects on cell migration and invasion, while ERα and Cav1 silencing were able to reverse them, demonstrating that both proteins are pivotal mediators of these FoxO3a controlled processes. In vivo, an immunohistochemical analysis on tissue sections from patients with ERα+ or ERα- invasive breast cancers or in situ ductal carcinoma showed that nuclear FoxO3a inversely (ERα+) or directly (ERα-) correlated with the invasive phenotype of breast tumors. In conclusion, FoxO3a role in breast cancer motility and invasion depends on ERα status, disclosing a novel aspect of the well-established FoxO3a/ERα interplay. Therefore FoxO3a might become a pursuable target to be suitably exploited in combination therapies either in ERα+ or ERα- breast tumors.
Collapse
Affiliation(s)
- Diego Sisci
- Department of Pharmacy and Health and Nutritional Sciences; University of Calabria; Arcavacata di Rende; Cosenza, Italy
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Hill MM, Daud NH, Aung CS, Loo D, Martin S, Murphy S, Black DM, Barry R, Simpson F, Liu L, Pilch PF, Hancock JF, Parat MO, Parton RG. Co-regulation of cell polarization and migration by caveolar proteins PTRF/Cavin-1 and caveolin-1. PLoS One 2012; 7:e43041. [PMID: 22912783 PMCID: PMC3418245 DOI: 10.1371/journal.pone.0043041] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Accepted: 07/16/2012] [Indexed: 11/18/2022] Open
Abstract
Caveolin-1 and caveolae are differentially polarized in migrating cells in various models, and caveolin-1 expression has been shown to quantitatively modulate cell migration. PTRF/cavin-1 is a cytoplasmic protein now established to be also necessary for caveola formation. Here we tested the effect of PTRF expression on cell migration. Using fluorescence imaging, quantitative proteomics, and cell migration assays we show that PTRF/cavin-1 modulates cellular polarization, and the subcellular localization of Rac1 and caveolin-1 in migrating cells as well as PKCα caveola recruitment. PTRF/cavin-1 quantitatively reduced cell migration, and induced mesenchymal epithelial reversion. Similar to caveolin-1, the polarization of PTRF/cavin-1 was dependent on the migration mode. By selectively manipulating PTRF/cavin-1 and caveolin-1 expression (and therefore caveola formation) in multiple cell systems, we unveil caveola-independent functions for both proteins in cell migration.
Collapse
Affiliation(s)
- Michelle M. Hill
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Queensland, Australia
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Noor Huda Daud
- School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia
| | - Cho Sanda Aung
- School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia
| | - Dorothy Loo
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Sally Martin
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Samantha Murphy
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Debra M. Black
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Rachael Barry
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Fiona Simpson
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Libin Liu
- Department of Biochemistry, Boston University School of Medicine, Boston, Massachusetts, United States of America
| | - Paul F. Pilch
- Department of Biochemistry, Boston University School of Medicine, Boston, Massachusetts, United States of America
| | - John F. Hancock
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Marie-Odile Parat
- School of Pharmacy, The University of Queensland, Brisbane, Queensland, Australia
- * E-mail: (RP); (M-OP)
| | - Robert G. Parton
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
- Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Queensland, Australia
- * E-mail: (RP); (M-OP)
| |
Collapse
|
8
|
WANG XH, ZHENG YM, CUI YQ, LIU S, SUN HC, LI F. The Inhibition Effect of Caveolin-1 on PANC1 Human Pancreatic Tumor Growth <I>In vitro</I> and <I>In vivo</I>*. PROG BIOCHEM BIOPHYS 2012. [DOI: 10.3724/sp.j.1206.2011.00168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
9
|
Caveolin-1 and breast cancer: a new clinical perspective. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 729:83-94. [PMID: 22411315 DOI: 10.1007/978-1-4614-1222-9_6] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The current chapter focuses on the role of Caveolin-1 (Cav-1) in cellular growth with an emphasis on its implication in breast cancer initiation, progression, clinical prognosis and as a potential therapeutic target. The role of Cav-1 as a tumor suppressor in breast cancer has emerged in the past few years, with dual functions on both cancer epithelium as well as the cancer stroma. Its multiple functions as a regulator of estrogen signaling and kinase activity and its newly found role as an important factor controlling the dynamic relationship between cancer epithelia and stroma position Cav-1 as a new therapeutic target for the treatment of breast cancer.
Collapse
|
10
|
Patani N, Martin LA, Reis-Filho JS, Dowsett M. The role of caveolin-1 in human breast cancer. Breast Cancer Res Treat 2011; 131:1-15. [PMID: 21901387 DOI: 10.1007/s10549-011-1751-4] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 08/18/2011] [Indexed: 02/06/2023]
Abstract
Caveolin-1 is the essential constituent protein of specialised plasma membrane invaginations called caveolae. The unique topology of caveolin-1 facilitates the role of caveolae as molecular hubs, integrating the activity of a multitude of signalling molecules. Despite improvements in our understanding of caveolin-1 interactions and the function of caveolae, the relationship between dysfunctional caveolin-1 and tumourigenesis remains contentious. Perhaps most intriguing has been the demonstration of both oncogenic and tumour suppressor function within particular tumour types, including breast cancer. In this review, the biological and clinical relevance of caveolin-1 in human breast cancer are considered. Evidence is systematically presented for the potential tumour suppressor and oncogenic functions of caveolin-1. Specific reference is made to interactions between caveolin-1 and signalling pathways in the clinical and biological subtypes of breast cancer. Areas of controversy are discussed and technical considerations are highlighted. Translational implications and potential for specific therapeutic manipulation of caveolin-1 are evaluated in the context of evidence from in vitro and in vivo studies.
Collapse
Affiliation(s)
- Neill Patani
- The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK
| | | | | | | |
Collapse
|
11
|
Activity of taspine isolated from Radix et Rhizoma Leonticis against estrogen-receptor-positive breast cancer. Fitoterapia 2011; 82:896-902. [DOI: 10.1016/j.fitote.2011.05.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Revised: 04/27/2011] [Accepted: 05/06/2011] [Indexed: 02/07/2023]
|
12
|
Pongjit K, Chanvorachote P. Caveolin-1 sensitizes cisplatin-induced lung cancer cell apoptosis via superoxide anion-dependent mechanism. Mol Cell Biochem 2011; 358:365-73. [DOI: 10.1007/s11010-011-0988-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Accepted: 07/06/2011] [Indexed: 10/18/2022]
|
13
|
Wilson KA, Colavito SA, Schulz V, Wakefield PH, Sessa W, Tuck D, Stern DF. NFBD1/MDC1 regulates Cav1 and Cav2 independently of DNA damage and p53. Mol Cancer Res 2011; 9:766-81. [PMID: 21551225 DOI: 10.1158/1541-7786.mcr-10-0317] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
NFBD1/MDC1 is involved in DNA damage checkpoint signaling and DNA repair. NFBD1 binds to the chromatin component γH2AX at sites of DNA damage, causing amplification of ataxia telangiectasia-mutated gene (ATM) pathway signaling and recruitment of DNA repair factors. Residues 508-995 of NFBD1 possess transactivation activity, suggesting a possible role of NFBD1 in transcription. Furthermore, NFBD1 influences p53-mediated transcription in response to adriamycin. We sought to determine the role of NFBD1 in ionizing radiation (IR)-responsive transcription and if NFBD1 influences transcription independently of p53. Using microarray analysis, we identified genes altered upon NFBD1 knockdown. Surprisingly, most NFBD1 regulated genes are regulated in both the absence and presence of IR, thus pointing toward a novel function for NFBD1 outside of the DNA damage response. Furthermore, NFBD1 knockdown regulated genes mostly independent of p53 knockdown. These genes are involved in pathways including focal adhesion signaling, carbohydrate metabolism, and insulin signaling. We found that CAV1 and CAV2 mRNA and protein levels are reduced by both NFBD1 knockdown and knockout independently of IR and p53. NFBD1-depleted cells exhibit some similar phenotypes to Cav1-depleted cells. Furthermore, like Cav1-depletion, NFBD1 shRNA increases Erk phosphorylation. Thus, Cav1 could act as a mediator of the DNA-damage independent effects of NFBD1 in mitogenic signaling.
Collapse
Affiliation(s)
- Kathleen A Wilson
- Yale University, 333 Cedar Street, P.O. Box 208023, New Haven, CT 06520, USA
| | | | | | | | | | | | | |
Collapse
|
14
|
Proteomic profiling of lipid rafts in a human breast cancer model of tumorigenic progression. Clin Exp Metastasis 2011; 28:529-40. [PMID: 21533873 DOI: 10.1007/s10585-011-9389-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Accepted: 04/10/2011] [Indexed: 12/27/2022]
Abstract
Tumor biomarkers assist in the early detection of cancer, act as therapeutic targets for intervention, and function as diagnostic indicators for the evaluation of therapeutic responses. To identify novel human breast cancer biomarkers, we have analyzed the protein content of lipid rafts isolated from a series of human mammary epithelial cell lines with increasing tumorigenic potential. Since lipid rafts function as platforms for protein interaction critical to several biological processes, we hypothesized that the abundance of proteins associated with proliferation, invasion and metastasis would be dysregulated in highly transformed cells. For this purpose, the MCF10A epithelial lineage, which include benign MCF10A cells, premalignant AT and TG3B cells, and malignant CA1a tumor cells, was utilized. Detergent-resistant membranes were isolated from each line and proteins were identified and relatively quantitated using iTRAQ™ reagents and tandem mass spectrometry. 57 proteins were identified, and 1667 peptide identifications, mapping to 49 proteins, contained sufficient information for semi-quantitative analysis. When comparing malignant to benign cells, we observed consistent alterations in groups of proteins, such as a 5.7-fold average decrease in G protein content (n = 5), 2.7-fold decrease in glycosylphosphatidylinositol-linked proteins (n = 7) and 3.3-fold increase in intermediate filaments (n = 9). Several of the identified proteins, including caveolin-1, filamin A, keratins 5, 6 and 17, and vimentin, are bona fide or candidate biomarkers in clinical studies, underscoring the usefulness of the MCF10A series as a model to better understand the biological mechanisms underlying cancer progression.
Collapse
|
15
|
Zhu H, Yue J, Pan Z, Wu H, Cheng Y, Lu H, Ren X, Yao M, Shen Z, Yang JM. Involvement of Caveolin-1 in repair of DNA damage through both homologous recombination and non-homologous end joining. PLoS One 2010; 5:e12055. [PMID: 20700465 PMCID: PMC2917373 DOI: 10.1371/journal.pone.0012055] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Accepted: 07/12/2010] [Indexed: 12/20/2022] Open
Abstract
Background Caveolin-1 (Cav-1), the major component of caveolae, is a 21–24 kDa integral membrane protein that interacts with a number of signaling molecules. By acting as a scaffolding protein, Cav-1 plays crucial roles in the regulation of various physiologic and patho-physiologic processes including oncogenic transformation and tumorigenesis, and tumor invasion and metastasis. Methodology/Principal Findings In the present study we sought to explore the role of Cav-1 in response to DNA damage and the mechanism involved. We found that the level of Cav-1 was up-regulated rapidly in cells treated with ionizing radiation. The up-regulation of Cav-1 following DNA damage occurred only in cells expressing endogenous Cav-1, and was associated with the activation of DNA damage response pathways. Furthermore, we demonstrated that the expression of Cav-1 protected cells against DNA damage through modulating the activities of both the homologous recombination (HR) and non-homologous end joining (NHEJ) repair systems, as evidenced by the inhibitory effects of the Cav-1-targeted siRNA on cell survival, HR frequency, phosphorylation of DNA-dependent protein kinase (DNA-PK), and nuclear translocation of epidermal growth factor receptor (EGFR) following DNA damage, and by the stimulatory effect of the forced expression of Cav-1 on NHEJ frequency. Conclusion/Significance Our results indicate that Cav-1 may play a critical role in sensing genotoxic stress and in orchestrating the response of cells to DNA damage through regulating the important molecules involved in maintaining genomic integrity.
Collapse
Affiliation(s)
- Hua Zhu
- Department of Pharmacology, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, United States of America
- * E-mail: (JMY); (HZ)
| | - Jingyin Yue
- Department of Radiation Oncology, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, United States of America
| | - Zui Pan
- Department of Physiology and Biophysics, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, United States of America
| | - Hao Wu
- Department of Pharmacology, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, United States of America
| | - Yan Cheng
- Department of Pharmacology and The Penn State Hershey Cancer Institute, The Pennsylvania State University College of Medicine, and Milton S. Hershey Medical Center, Hershey, Pennsylvania, United States of America
| | - Huimei Lu
- Department of Radiation Oncology, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, United States of America
| | - Xingcong Ren
- Department of Pharmacology and The Penn State Hershey Cancer Institute, The Pennsylvania State University College of Medicine, and Milton S. Hershey Medical Center, Hershey, Pennsylvania, United States of America
| | - Ming Yao
- Department of Pharmacology, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, United States of America
| | - Zhiyuan Shen
- Department of Radiation Oncology, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey, United States of America
| | - Jin-Ming Yang
- Department of Pharmacology and The Penn State Hershey Cancer Institute, The Pennsylvania State University College of Medicine, and Milton S. Hershey Medical Center, Hershey, Pennsylvania, United States of America
- * E-mail: (JMY); (HZ)
| |
Collapse
|
16
|
Senou M, Khalifa C, Thimmesch M, Jouret F, Devuyst O, Col V, Audinot JN, Lipnik P, Moreno JC, Van Sande J, Dumont JE, Many MC, Colin IM, Gérard AC. A coherent organization of differentiation proteins is required to maintain an appropriate thyroid function in the Pendred thyroid. J Clin Endocrinol Metab 2010; 95:4021-30. [PMID: 20501687 DOI: 10.1210/jc.2010-0228] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
CONTEXT Pendred syndrome is caused by mutations in the gene coding for pendrin, an apical Cl-/I- exchanger. OBJECTIVE To analyze intrathyroidal compensatory mechanisms when pendrin is lacking, we investigated the thyroid of a patient with Pendred syndrome. The expression of proteins involved in thyroid hormone synthesis, markers of oxidative stress (OS), cell proliferation, apoptosis, and antioxidant enzymes were analyzed. RESULTS Three morphological zones were identified: nearly normal follicles with iodine-rich thyroglobulin in the colloid (zone 1.a), small follicles without iodine-rich thyroglobulin in lumina (zone 1.b), and destroyed follicles (zone 2). In zones 1.a, dual oxidase (Duox) and thyroid peroxidase (TPO) were localized at the apical pole, OS and cell apoptosis were absent, but ClC-5 expression was strongly increased. In zones 1.b, Duox and TPO were aberrantly present and increased in the cytosol and associated with high OS, apoptosis, cell proliferation, and increased expression of peroxiredoxin-5, catalase, and dehalogenase-1 but moderate ClC-5 expression. CONCLUSION In conclusion, the absence of pendrin is accompanied by increased ClC-5 expression that may transiently compensate for apical iodide efflux. In more affected follicles, Duox and TPO are relocated in the cytosol, leading to abnormal intracellular thyroid hormone synthesis, which results in cell destruction presumably because intracellular OS cannot be buffered by antioxidant defenses.
Collapse
Affiliation(s)
- Maximin Senou
- Unité de Morphologie Expérimentale, Université Catholique de Louvain, UCL-5251, 52 Avenue E. Mounier, B-1200 Brussels, Belgium
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|