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Drobysheva D, Smith BA, McDowell M, Guillen KP, Ekiz HA, Welm BE. Transformation of enriched mammary cell populations with polyomavirus middle T antigen influences tumor subtype and metastatic potential. Breast Cancer Res 2015; 17:132. [PMID: 26429062 PMCID: PMC4589945 DOI: 10.1186/s13058-015-0641-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 09/09/2015] [Indexed: 12/18/2022] Open
Abstract
INTRODUCTION Breast cancer exhibits significant molecular, histological, and pathological diversity. Factors that impact this heterogeneity are poorly understood; however, transformation of distinct normal cell populations of the breast may generate different tumor phenotypes. Our previous study demonstrated that the polyomavirus middle T antigen (PyMT) oncogene can establish diverse tumor subtypes when broadly expressed within mouse mammary epithelial cells. In the present study, we assessed the molecular, histological, and metastatic outcomes in distinct mammary cell populations transformed with the PyMT gene. METHODS Isolated mouse mammary epithelial cells were transduced with a lentivirus encoding PyMT during an overnight infection and then sorted into hormone receptor-positive luminal (CD133+), hormone receptor-negative luminal (CD133-), basal, and stem cell populations using the cell surface markers CD24, CD49f, and CD133. Each population was subsequently transplanted into syngeneic cleared mouse mammary fat pads to generate tumors. Tumors were classified by histology, estrogen receptor status, molecular subtype, and metastatic potential to investigate whether transformation of different enriched populations affects tumor phenotype. RESULTS Although enriched mammary epithelial cell populations showed no difference in either the ability to form tumors or tumor latency, differences in prevalence of solid adenocarcinomas and squamous, papillary, and sebaceous-like tumors were observed. In particular, squamous metaplasia was observed more frequently in tumors derived from basal and stem cells than in luminal cells. Interestingly, both molecularly basal and luminal tumors developed from luminal CD133+, basal, and stem cell populations; however, luminal CD133- cells gave rise exclusively to molecularly basal tumors. Tumors arising from the luminal CD133-, basal, and stem cell populations were highly metastatic; however, luminal CD133+ cells generated tumors that were significantly less metastatic, possibly due to an inability of these tumor cells to escape the primary tumor site. CONCLUSIONS Expression of PyMT within different mammary cell populations influences tumor histology, molecular subtype, and metastatic potential. The data demonstrate that luminal CD133+ cells give rise to less metastatic tumors, luminal CD133- cells preferentially establish basal tumors, and the cell of origin for squamous metaplasia likely resides in the basal and stem cell populations.
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Affiliation(s)
- Daria Drobysheva
- Department of Oncological Sciences, University of Utah, 315 South 1400 East, Salt Lake City, UT, 84112, USA.
| | - Brittni Alise Smith
- Department of Oncological Sciences, University of Utah, 315 South 1400 East, Salt Lake City, UT, 84112, USA.
| | - Maria McDowell
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, OK, 73104, USA.
| | - Katrin P Guillen
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, OK, 73104, USA.
| | - Huseyin Atakan Ekiz
- Department of Oncological Sciences, University of Utah, 315 South 1400 East, Salt Lake City, UT, 84112, USA.
| | - Bryan E Welm
- Immunobiology and Cancer Program, Oklahoma Medical Research Foundation, 825 Northeast 13th Street, Oklahoma City, OK, 73104, USA. .,Current address: Department of Surgery, Huntsman Cancer Institute, University of Utah, 2000 Circle of Hope Drive, Salt Lake City, UT, 84112, USA.
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Bieniasz M, Radhakrishnan P, Faham N, De La O JP, Welm AL. Preclinical Efficacy of Ron Kinase Inhibitors Alone and in Combination with PI3K Inhibitors for Treatment of sfRon-Expressing Breast Cancer Patient-Derived Xenografts. Clin Cancer Res 2015; 21:5588-600. [PMID: 26289070 DOI: 10.1158/1078-0432.ccr-14-3283] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 08/11/2015] [Indexed: 12/20/2022]
Abstract
PURPOSE Recent studies have demonstrated that short-form Ron (sfRon) kinase drives breast tumor progression and metastasis through robust activation of the PI3K pathway. We reasoned that upfront, concurrent inhibition of sfRon and PI3K might enhance the antitumor effects of Ron kinase inhibitor therapy while also preventing potential therapeutic resistance to tyrosine kinase inhibitors (TKI). EXPERIMENTAL DESIGN We used patient-derived breast tumor xenografts (PDX) as high-fidelity preclinical models to determine the efficacy of single-agent or dual Ron/PI3K inhibition. We tested the Ron kinase inhibitor ASLAN002 with and without coadministration of the PI3K inhibitor NVP-BKM120 in hormone receptor-positive [estrogen receptor (ER)(+)/progesterone receptor (PR)(+)] breast PDXs with and without PIK3CA gene mutation. RESULTS Breast PDX tumors harboring wild-type PIK3CA showed a robust response to ASLAN002 as a single agent. In contrast, PDX tumors harboring mutated PIK3CA demonstrated partial resistance to ASLAN002, which was overcome with addition of NVP-BKM120 to the treatment regimen. We further demonstrated that concurrent inhibition of sfRon and PI3K in breast PDX tumors with wild-type PIK3CA provided durable tumor stasis after therapy cessation, whereas discontinuation of either monotherapy facilitated tumor recurrence. CONCLUSIONS Our work provides preclinical rationale for targeting sfRon in patients with breast cancer, with the important stipulation that tumors harboring PIK3CA mutations may be partially resistant to Ron inhibitor therapy. Our data also indicate that tumors with wild-type PIK3CA are most effectively treated with an upfront combination of Ron and PI3K inhibitors for the most durable response. Clin Cancer Res; 21(24); 5588-600. ©2015 AACR.
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Affiliation(s)
- Magdalena Bieniasz
- Oklahoma Medical Research Foundation, Program in Immunobiology and Cancer, Oklahoma City, Oklahoma.
| | | | - Najme Faham
- Oklahoma Medical Research Foundation, Program in Immunobiology and Cancer, Oklahoma City, Oklahoma
| | | | - Alana L Welm
- Huntsman Cancer Institute, Salt Lake City, Utah.
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Raeppel F, Raeppel SL, Therrien E. Design, synthesis and RON receptor tyrosine kinase inhibitory activity of new head groups analogs of LCRF-0004. Bioorg Med Chem Lett 2015; 25:3810-5. [PMID: 26243370 DOI: 10.1016/j.bmcl.2015.07.080] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 07/21/2015] [Accepted: 07/23/2015] [Indexed: 12/31/2022]
Abstract
New heteroarylcarboxamide head groups substituted with two aromatic rings analogs of thieno[3,2-b]pyridine-based kinase inhibitor LCRF-0004 were designed and synthesized. Potent inhibitors of RON tyrosine kinase with various level of selectivity for c-Met RTK were obtained.
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Affiliation(s)
- Franck Raeppel
- Laboratoires ChemRF Inc./ChemRF Laboratories Inc., 3194 rue Claude-Jodoin, Montréal, QC H1Y 3M2, Canada
| | - Stéphane L Raeppel
- Laboratoires ChemRF Inc./ChemRF Laboratories Inc., 3194 rue Claude-Jodoin, Montréal, QC H1Y 3M2, Canada.
| | - Eric Therrien
- Laboratoires ChemRF Inc./ChemRF Laboratories Inc., 3194 rue Claude-Jodoin, Montréal, QC H1Y 3M2, Canada
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Rautela J, Baschuk N, Slaney CY, Jayatilleke KM, Xiao K, Bidwell BN, Lucas EC, Hawkins ED, Lock P, Wong CS, Chen W, Anderson RL, Hertzog PJ, Andrews DM, Möller A, Parker BS. Loss of Host Type-I IFN Signaling Accelerates Metastasis and Impairs NK-cell Antitumor Function in Multiple Models of Breast Cancer. Cancer Immunol Res 2015. [PMID: 26198985 DOI: 10.1158/2326-6066.cir-15-0065] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Metastatic progression is the major cause of breast cancer-related mortality. By examining multiple syngeneic preclinical breast cancer models in mice lacking a functional type-I interferon receptor (Ifnar1(-/-) mice), we show that host-derived type-I interferon (IFN) signaling is a critical determinant of metastatic spread that is independent of primary tumor growth. In particular, we show that bone metastasis can be accelerated in Balb/c Ifnar1(-/-) mice bearing either 4T1 or 66cl4 orthotopic tumors and, for the first time, present data showing the development of bone metastasis in the C57Bl/6 spontaneous MMTV-PyMT-driven model of tumorigenesis. Further exploration of these results revealed that endogenous type-I IFN signaling to the host hematopoietic system is a key determinant of metastasis-free survival and critical to the responsiveness of the circulating natural killer (NK)-cell population. We find that in vivo-stimulated NK cells derived from wild-type, but not Ifnar1(-/-), mice can eliminate the 4T1 and 66cl4 breast tumor lines with varying kinetics in vitro. Together, this study indicates that the dysregulated immunity resulting from a loss of host type-I IFN signaling is sufficient to drive metastasis, and provides a rationale for targeting the endogenous type-I IFN pathway as an antimetastatic strategy.
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Affiliation(s)
- Jai Rautela
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia. Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia. Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Victoria, Australia
| | - Nikola Baschuk
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Clare Y Slaney
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia. Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia. Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Victoria, Australia
| | - Krishnath M Jayatilleke
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Kun Xiao
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | | | - Erin C Lucas
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Edwin D Hawkins
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Peter Lock
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Christina S Wong
- QIMR Berghofer Medical Research Institute, Herston, Queensland, Australia
| | - Weisan Chen
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Robin L Anderson
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia. Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Victoria, Australia. Department of Pathology, University of Melbourne, Parkville, Victoria, Australia
| | - Paul J Hertzog
- Centre for Innate Immunity and Infectious Diseases, Monash Institute of Medical Research, Monash University, Clayton, Victoria, Australia
| | - Daniel M Andrews
- Department of Immunology, Monash University Central Clinical School, Alfred Medical Research and Education Precinct (AMREP), Melbourne, Victoria, Australia
| | - Andreas Möller
- QIMR Berghofer Medical Research Institute, Herston, Queensland, Australia
| | - Belinda S Parker
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia.
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Batth IS, Yun H, Kumar AP. Recepteur d'origine nantais (RON), more than a kinase: Role in castrate-resistant prostate cancer. Mol Carcinog 2015; 54:937-46. [PMID: 26152593 DOI: 10.1002/mc.22354] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 05/20/2015] [Accepted: 05/28/2015] [Indexed: 12/30/2022]
Abstract
Prostate cancer (PCA) is the second leading cause of cancer-related deaths in men in the United States. It is natural for a hormone-driven malignancy such as prostate cancer that androgen deprivation therapy (ADT) would be the preferred treatment for clinical disease management. However, after initial treatment response a vast majority of patients develop metastatic castrate-resistant prostate cancer (CRPC), which is fatal. While great headway has been made to understand the possible mechanisms that drive castrate-resistant disease, a bonafide cure remains elusive. Reactivation of androgen receptor (AR) signaling partly contributes to the emergence of CRPC. Here we briefly examine some of the known mechanisms of AR reactivation including intratumoral synthesis of androgens, modulation of AR coregulators, and AR variants with constitutive activity as well as activation of receptor tyrosine kinases. We primarily focus on the emerging dual function of the receptor tyrosine kinase (recepteur d'origine nantais; RON) as a traditional tyrosine kinase and transcription factor. We further discuss activation of RON as an alternate mechanism in the development of CRPC and available therapeutic approaches for clinical management of CRPC by combined inhibition of RON and AR.
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Affiliation(s)
- Izhar Singh Batth
- Department of Urology, University of Texas Health Science Center, San Antonio, Texas
| | - Huiyoung Yun
- Department of Pharmacology, University of Texas Health Science Center, San Antonio, Texas
| | - Addankl P Kumar
- Department of Urology, University of Texas Health Science Center, San Antonio, Texas.,Department of Pharmacology, University of Texas Health Science Center, San Antonio, Texas.,Department of Molecular Medicine, University of Texas Health Science Center, San Antonio, Texas.,Cancer Therapy and Research Center, University of Texas Health Science Center, San Antonio, Texas.,South Texas Veterans Health Care System, San Antonio, Texas
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Abstract
It is well established that cancer development ensues based on reciprocal interactions between genomically altered neoplastic cells and diverse populations of recruited "host" cells co-opted to support malignant progression. Among the host cells recruited into tumor microenvironments, several subtypes of myeloid cells, including macrophages, monocytes, dendritic cells, and granulocytes contribute to tumor development by providing tumor-promoting factors as well as a spectrum of molecules that suppress cytotoxic activities of T lymphocytes. Based on compelling preclinical data revealing that inhibition of critical myeloid-based programs leads to tumor suppression, novel immune-based therapies and approaches are now entering the clinic for evaluation. This review discusses mechanisms underlying protumorigenic programming of myeloid cells and discusses how targeting of these has potential to attenuate solid tumor progression via the induction and of mobilization CD8 cytotoxic T cell immunity.
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Affiliation(s)
- Tiziana Cotechini
- Department of Cell, Developmental & Cancer Biology, Oregon Health & Science University, Portland, OR
| | - Terry R. Medler
- Department of Cell, Developmental & Cancer Biology, Oregon Health & Science University, Portland, OR
| | - Lisa M. Coussens
- Department of Cell, Developmental & Cancer Biology, Oregon Health & Science University, Portland, OR
- Knight Cancer Institute, Oregon Health & Science University, Portland, OR
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57
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Design and synthesis of constrained analogs of LCRF-0004 as potent RON tyrosine kinase inhibitors. Bioorg Med Chem Lett 2015; 25:3706-10. [PMID: 26112445 DOI: 10.1016/j.bmcl.2015.06.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 06/08/2015] [Indexed: 01/09/2023]
Abstract
New fused bicyclic lactam head groups as rigidified analogs of thieno[3,2-b]pyridine-based kinase inhibitor LCRF-0004 were designed and synthesized. Depending on the functionalities and the size of these bicyclic head groups, potent inhibitors of RON tyrosine kinase with various level of selectivity against c-Met tyrosine kinase were obtained.
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58
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Gross S, Rahal R, Stransky N, Lengauer C, Hoeflich KP. Targeting cancer with kinase inhibitors. J Clin Invest 2015; 125:1780-9. [PMID: 25932675 DOI: 10.1172/jci76094] [Citation(s) in RCA: 311] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Kinase inhibitors have played an increasingly prominent role in the treatment of cancer and other diseases. Currently, more than 25 oncology drugs that target kinases have been approved, and numerous additional therapeutics are in various stages of clinical evaluation. In this Review, we provide an in-depth analysis of activation mechanisms for kinases in cancer, highlight recent successes in drug discovery, and demonstrate the clinical impact of selective kinase inhibitors. We also describe the substantial progress that has been made in designing next-generation inhibitors to circumvent on-target resistance mechanisms, as well as ongoing strategies for combining kinase inhibitors in the clinic. Last, there are numerous prospects for the discovery of novel kinase targets, and we explore cancer immunotherapy as a new and promising research area for studying kinase biology.
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59
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Raeppel SL, Raeppel F, Therrien E. Design and synthesis of close analogs of LCRF-0004, a potent and selective RON receptor tyrosine kinase inhibitor. Bioorg Med Chem Lett 2015; 25:2527-31. [PMID: 25953155 DOI: 10.1016/j.bmcl.2015.04.056] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 04/14/2015] [Accepted: 04/17/2015] [Indexed: 10/23/2022]
Abstract
New carboxamide head group analogs of thieno[3,2-b]pyridine-based kinase inhibitor LCRF-0004 were designed and synthesized. Potent and selective inhibitors of RON enzyme versus c-Met RTK were obtained.
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Affiliation(s)
- Stéphane L Raeppel
- ChemRF Laboratories, 3194 rue Claude-Jodoin, Montréal, QC H1Y 3M2, Canada.
| | - Franck Raeppel
- ChemRF Laboratories, 3194 rue Claude-Jodoin, Montréal, QC H1Y 3M2, Canada
| | - Eric Therrien
- ChemRF Laboratories, 3194 rue Claude-Jodoin, Montréal, QC H1Y 3M2, Canada
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Feng L, Yao HP, Wang W, Zhou YQ, Zhou J, Zhang R, Wang MH. Efficacy of anti-RON antibody Zt/g4-drug maytansinoid conjugation (Anti-RON ADC) as a novel therapeutics for targeted colorectal cancer therapy. Clin Cancer Res 2014; 20:6045-58. [PMID: 25294907 DOI: 10.1158/1078-0432.ccr-14-0898] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
PURPOSE The receptor tyrosine kinase RON is critical in epithelial tumorigenesis and a drug target for cancer therapy. Here, we report the development and therapeutic efficacy of a novel anti-RON antibody Zt/g4-maytansinoid (DM1) conjugates for targeted colorectal cancer (CRC) therapy. EXPERIMENTAL DESIGN Zt/g4 (IgG1a/κ) was conjugated to DM1 via thioether linkage to form Zt/g4-DM1 with a drug-antibody ratio of 4:1. CRC cell lines expressing different levels of RON were tested in vitro to determine Zt/g4-DM1-induced RON endocytosis, cell-cycle arrest, and cytotoxicity. Efficacy of Zt/g4-DM1 in vivo was evaluated in mouse xenograft CRC tumor model. RESULTS Zt/g4-DM1 rapidly induced RON endocytosis, arrested cell cycle at G2-M phase, reduced cell viability, and caused massive cell death within 72 hours. In mouse xenograft CRC models, Zt/g4-DM1 at a single dose of 20 mg/kg body weight effectively delayed CRC cell-mediated tumor growth up to 20 days. In a multiple dose-ranging study with a five injection regimen, Zt/g4-DM1 inhibited more than 90% tumor growth at doses of 7, 10, and 15 mg/kg body weight. The minimal dose achieving 50% of tumor inhibition was approximately 5.0 mg/kg. The prepared Zt/g4-DM1 is stable at 37°C for up to 30 days. At 60 mg/kg, Zt/g4-DM1 had a moderate toxicity in vivo with an average of 12% reduction in mouse body weight. CONCLUSION Zt/g4-DM1 is highly effective in targeted inhibition of CRC cell-derived tumor growth in mouse xenograft models. This work provides the basis for development of humanized Zt/g4-DM1 for RON-targeted CRC therapy in the future.
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Affiliation(s)
- Liang Feng
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Hospital of Zhejiang University School of Medicine, Zhejiang, China. Department of Biomedical Sciences, Texas Tech University Health Sciences Center School of Pharmacy, Amarillo, Texas
| | - Hang-Ping Yao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Hospital of Zhejiang University School of Medicine, Zhejiang, China
| | - Wei Wang
- Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center School of Pharmacy, Amarillo, Texas
| | - Yong-Qing Zhou
- Department of Neurosurgery, First Hospital of Zhejiang University School of Medicine, Zhejiang, China
| | - Jianwei Zhou
- Department of Molecular Cell Biology and Toxicology, Nanjing Medical University School of Public Health, Jiangsu, China
| | - Ruiwen Zhang
- Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center School of Pharmacy, Amarillo, Texas
| | - Ming-Hai Wang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, First Hospital of Zhejiang University School of Medicine, Zhejiang, China. Department of Biomedical Sciences, Texas Tech University Health Sciences Center School of Pharmacy, Amarillo, Texas.
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Zhang XHF, Giuliano M, Trivedi MV, Schiff R, Osborne CK. Metastasis dormancy in estrogen receptor-positive breast cancer. Clin Cancer Res 2014; 19:6389-97. [PMID: 24298069 DOI: 10.1158/1078-0432.ccr-13-0838] [Citation(s) in RCA: 170] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
About 20% to 40% of patients with breast cancer eventually develop recurrences in distant organs, which are often not detected until years to decades after the primary tumor diagnosis. This phenomenon is especially pronounced in estrogen receptor-positive (ER(+)) breast cancer, suggesting that ER(+) cancer cells may stay dormant for a protracted period of time, despite adjuvant therapies. Multiple mechanisms have been proposed to explain how cancer cells survive and remain in dormancy, and how they become reactivated and exit dormancy. These mechanisms include angiogenic switch, immunosurveillance, and interaction with extracellular matrix and stromal cells. How to eradicate or suppress these dormant cancer cells remains a major clinical issue because of the lack of knowledge about the biologic and clinical nature of these cells. Herein, we review the clinical manifestation of metastasis dormancy in ER(+) tumors, the current biologic insights regarding tumor dormancy obtained from various experimental models, and the clinical challenges to predict, detect, and treat dormant metastases. We also discuss future research directions toward a better understanding of the biologic mechanisms and clinical management of ER(+) dormant metastasis.
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Affiliation(s)
- Xiang H-F Zhang
- Authors' Affiliations: Lester and Sue Smith Breast Center, Dan L. Duncan Cancer Center, Department of Molecular and Cellular Biology, Baylor College of Medicine; Department of Clinical Sciences and Administration, University of Houston, College of Pharmacy; McNair Medical Institute, Houston, Texas; and Department of Clinical Medicine and Surgery, University Federico II, Naples, Italy
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Wang X, Yennawar N, Hankey PA. Autoinhibition of the Ron receptor tyrosine kinase by the juxtamembrane domain. Cell Commun Signal 2014; 12:28. [PMID: 24739671 PMCID: PMC4021555 DOI: 10.1186/1478-811x-12-28] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Accepted: 02/05/2014] [Indexed: 01/21/2023] Open
Abstract
Background The Ron receptor tyrosine kinase (RTK) has been implicated in the progression of a number of carcinomas, thus understanding the regulatory mechanisms governing its activity is of potential therapeutic significance. A critical role for the juxtamembrane domain in regulating RTK activity is emerging, however the mechanism by which this regulation occurs varies considerably from receptor to receptor. Results Unlike other RTKs described to date, tyrosines in the juxtamembrane domain of Ron are inconsequential for receptor activation. Rather, we have identified an acidic region in the juxtamembrane domain of Ron that plays a central role in promoting receptor autoinhibition. Furthermore, our studies demonstrate that phosphorylation of Y1198 in the kinase domain promotes Ron activation, likely by relieving the inhibitory constraints imposed by the juxtamembrane domain. Conclusions Taken together, our experimental data and molecular modeling provide a better understanding of the mechanisms governing Ron activation, which will lay the groundwork for the development of novel therapeutic approaches for targeting Ron in human malignancies.
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Affiliation(s)
| | | | - Pamela A Hankey
- Graduate Program in Cell and Developmental Biology, The Pennsylvania State University, University Park, PA 16802, USA.
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Eyob H, Ekiz HA, Welm AL. RON promotes the metastatic spread of breast carcinomas by subverting antitumor immune responses. Oncoimmunology 2013; 2:e25670. [PMID: 24327933 PMCID: PMC3850023 DOI: 10.4161/onci.25670] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 07/08/2013] [Indexed: 02/08/2023] Open
Abstract
The MSP/RON signaling pathway favors the conversion of micrometastatic lesions to overt metastases by suppressing antitumor immune responses. The loss of RON functions in the host potentiates tumor-specific CD8+ T-cell responses, hence inhibiting the outgrowth of metastatic cancer cells. Thus, RON inhibitors may potentially prevent the outgrowth of micrometastases in cancer patients.
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Affiliation(s)
- Henok Eyob
- Department of Oncological Sciences; Huntsman Cancer Institute; University of Utah; Salt Lake City, UT USA
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Abstract
Since the discovery of MSP (macrophage-stimulating protein; also known as MST1 and hepatocyte growth factor-like (HGFL)) as the ligand for the receptor tyrosine kinase RON (also known as MST1R) in the early 1990s, the roles of this signalling axis in cancer pathogenesis has been extensively studied in various model systems. Both in vitro and in vivo evidence has revealed that MSP-RON signalling is important for the invasive growth of different types of cancers. Currently, small-molecule inhibitors and antibodies blocking RON signalling are under investigation. Substantial responses have been achieved in human tumour xenograft models, laying the foundation for clinical validation. In this Review, we discuss recent advances that demonstrate the importance of MSP-RON signalling in cancer and its potential as a therapeutic target.
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Affiliation(s)
- Hang-Ping Yao
- Viral Oncogenesis Section in State Key Laboratory for Diagnosis & Treatment of Infectious Diseases, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310003, P. R. China
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