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Stanojevic M, Hont AB, Geiger A, O'Brien S, Ulrey R, Grant M, Datar A, Lee PH, Lang H, Cruz CRY, Hanley PJ, Barrett AJ, Keller MD, Bollard CM. Identification of novel HLA-restricted preferentially expressed antigen in melanoma peptides to facilitate off-the-shelf tumor-associated antigen-specific T-cell therapies. Cytotherapy 2021; 23:694-703. [PMID: 33832817 PMCID: PMC8316284 DOI: 10.1016/j.jcyt.2021.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 02/02/2021] [Accepted: 03/03/2021] [Indexed: 12/19/2022]
Abstract
BACKGROUND AIMS Preferentially expressed antigen in melanoma (PRAME) is a cancer/testis antigen that is overexpressed in many human malignancies and poorly expressed or absent in healthy tissues, making it a good target for anti-cancer immunotherapy. Development of an effective off-the-shelf adoptive T-cell therapy for patients with relapsed or refractory solid tumors and hematological malignancies expressing PRAME antigen requires the identification of major histocompatibility complex (MHC) class I and II PRAME antigens recognized by the tumor-associated antigen (TAA) T-cell product. The authors therefore set out to extend the repertoire of HLA-restricted PRAME peptide epitopes beyond the few already characterized. METHODS Peptide libraries of 125 overlapping 15-mer peptides spanning the entire PRAME protein sequence were used to identify HLA class I- and II-restricted epitopes. The authors also determined the HLA restriction of the identified epitopes. RESULTS PRAME-specific T-cell products were successfully generated from peripheral blood mononuclear cells of 12 healthy donors. Ex vivo-expanded T cells were polyclonal, consisting of both CD4+ and CD8+ T cells, which elicited anti-tumor activity in vitro. Nine MHC class I-restricted PRAME epitopes were identified (seven novel and two previously described). The authors also characterized 16 individual 15-mer peptide sequences confirmed as CD4-restricted epitopes. CONCLUSIONS TAA T cells derived from healthy donors recognize a broad range of CD4+ and CD8+ HLA-restricted PRAME epitopes, which could be used to select suitable donors for generating off-the-shelf TAA-specific T cells.
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Affiliation(s)
- Maja Stanojevic
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Amy B Hont
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Ashley Geiger
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Samuel O'Brien
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Robert Ulrey
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Melanie Grant
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Anushree Datar
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Ping-Hsien Lee
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Haili Lang
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA
| | - Conrad R Y Cruz
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA; GW Cancer Center, George Washington University, Washington, DC, USA
| | - Patrick J Hanley
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA; GW Cancer Center, George Washington University, Washington, DC, USA; Division of Blood and Marrow Transplantation, Children's National Hospital, Washington, DC, USA
| | - A John Barrett
- GW Cancer Center, George Washington University, Washington, DC, USA
| | - Michael D Keller
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA; Division of Allergy and Immunology, Children's National Hospital, Washington, DC, USA
| | - Catherine M Bollard
- Center for Cancer and Immunology Research, Children's National Hospital, Washington, DC, USA; GW Cancer Center, George Washington University, Washington, DC, USA; Division of Blood and Marrow Transplantation, Children's National Hospital, Washington, DC, USA.
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Xu Y, Zou R, Wang J, Wang ZW, Zhu X. The role of the cancer testis antigen PRAME in tumorigenesis and immunotherapy in human cancer. Cell Prolif 2020; 53:e12770. [PMID: 32022332 PMCID: PMC7106952 DOI: 10.1111/cpr.12770] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 01/01/2020] [Accepted: 01/15/2020] [Indexed: 12/24/2022] Open
Abstract
Preferentially expressed antigen in melanoma (PRAME), which belongs to the cancer/testis antigen (CTA) gene family, plays a pivotal role in multiple cellular processes and immunotherapy response in human cancers. PRAME is highly expressed in different types of cancers and is involved in cell proliferation, apoptosis, differentiation and metastasis as well as the outcomes of patients with cancer. In this review article, we discuss the potential roles and physiological functions of PRAME in various types of cancers. Moreover, this review highlights immunotherapeutic strategies that target PRAME in human malignancies. Therefore, the modulation of PRAME might be useful for the treatment of patients with cancer.
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Affiliation(s)
- Yichi Xu
- Departmant of Obstetrics and Gynecology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Ruanmin Zou
- Departmant of Obstetrics and Gynecology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Jing Wang
- Departmant of Obstetrics and Gynecology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zhi-Wei Wang
- Departmant of Obstetrics and Gynecology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China.,Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Xueqiong Zhu
- Departmant of Obstetrics and Gynecology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
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Retargeting Oncolytic Vesicular Stomatitis Virus to Human T-Cell Lymphotropic Virus Type 1-Associated Adult T-Cell Leukemia. J Virol 2015; 89:11786-800. [PMID: 26378177 PMCID: PMC4645320 DOI: 10.1128/jvi.01356-15] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 08/18/2015] [Indexed: 12/11/2022] Open
Abstract
UNLABELLED Adult T cell leukemia/lymphoma (ATL) is an aggressive cancer of CD4/CD25(+) T lymphocytes, the etiological agent of which is human T-cell lymphotropic virus type 1 (HTLV-1). ATL is highly refractory to current therapies, making the development of new treatments a high priority. Oncolytic viruses such as vesicular stomatitis virus (VSV) are being considered as anticancer agents since they readily infect transformed cells compared to normal cells, the former appearing to exhibit defective innate immune responses. Here, we have evaluated the efficacy and safety of a recombinant VSV that has been retargeted to specifically infect and replicate in transformed CD4(+) cells. This was achieved by replacing the single VSV glycoprotein (G) with human immunodeficiency virus type 1 (HIV-1) gp160 to create a hybrid fusion protein, gp160G. The resultant virus, VSV-gp160G, was found to only target cells expressing CD4 and retained robust oncolytic activity against HTLV-1 actuated ATL cells. VSV-gp160G was further noted to be highly attenuated and did not replicate efficiently in or induce significant cell death of primary CD4(+) T cells. Accordingly, VSV-gp160G did not elicit any evidence of neurotoxicity even in severely immunocompromised animals such as NOD/Shi-scid, IL-2Rγ-c-null (NSG) mice. Importantly, VSV-gp160G effectively exerted potent oncolytic activity in patient-derived ATL transplanted into NSG mice and facilitated a significant survival benefit. Our data indicate that VSV-gp160G exerts potent oncolytic efficacy against CD4(+) malignant cells and either alone or in conjunction with established therapies may provide an effective treatment in patients displaying ATL. IMPORTANCE Adult T cell leukemia (ATL) is a serious form of cancer with a high mortality rate. HTLV-1 infection is the etiological agent of ATL and, unfortunately, most patients succumb to the disease within a few years. Current treatment options have failed to significantly improve survival rate. In this study, we developed a recombinant strain of vesicular stomatitis virus (VSV) that specifically targets transformed CD4(+) T cells through replacement of the G protein of VSV with a hybrid fusion protein, combining domains from gp160 of HIV-1 and VSV-G. This modification eliminated the normally broad tropism of VSV and restricted infection to primarily the transformed CD4(+) cell population. This effect greatly reduced neurotoxic risk associated with VSV infection while still allowing VSV to effectively target ATL cells.
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Kobayashi H, Kumai T, Hayashi S, Matsuda Y, Aoki N, Sato K, Kimura S, Celis E. A naturally processed HLA-DR-bound peptide from the IL-9 receptor alpha of HTLV-1-transformed T cells serves as a T helper epitope. Cancer Immunol Immunother 2012; 61:2215-25. [PMID: 22638550 PMCID: PMC11029050 DOI: 10.1007/s00262-012-1284-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Accepted: 05/07/2012] [Indexed: 10/28/2022]
Abstract
Human T cell leukemia virus type 1 (HTLV-1) induced adult T cell leukemia/lymphoma (ATLL) is usually a fatal lymphoproliferative malignant disease. Thus, the enhancement of T cell immunity to ATLL through the development of therapeutic vaccines using characterized T cell peptide epitopes could be of value. We isolated and characterized HLA-DR-bound peptides from HTLV-1-transformed T cells by fractionating on reverse-phase high performance liquid chromatography and Edman NH(2)-terminal sequencing and were able to identify five independent peptide sequences. One of the identified peptide sequences corresponded to a fragment of the human interleukin-9 receptor alpha (IL-9Rα), which is commonly expressed by HTLV-1-infected T cell lymphoma cells. Using a synthetic peptide corresponding to the identified IL-9Rα sequence, we generated antigen-specific CD4 helper T lymphocytes in vitro, which were restricted by HLA-DR15 or HLA-DR53 molecules and could recognize and kill HTLV-1+, IL-9Rα+ T cell lymphoma cells. These results indicate that IL-9Rα functions as T cell leukemia/lymphoma-associated antigen for CD4 T cells and that synthetic peptides such as the one described here could be used for T cell-based immunotherapy against IL-9Rα positive ATLL.
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MESH Headings
- Animals
- CD4-Positive T-Lymphocytes/immunology
- CD4-Positive T-Lymphocytes/metabolism
- Cell Line, Tumor
- Cell Transformation, Viral/immunology
- Dendritic Cells/immunology
- Dendritic Cells/metabolism
- Epitopes, T-Lymphocyte/immunology
- Epitopes, T-Lymphocyte/metabolism
- Fibroblasts/immunology
- Fibroblasts/metabolism
- HLA-DR Antigens/immunology
- HLA-DR Antigens/metabolism
- HLA-DR Serological Subtypes/immunology
- HLA-DR Serological Subtypes/metabolism
- HLA-DRB4 Chains/immunology
- HLA-DRB4 Chains/metabolism
- Human T-lymphotropic virus 1/immunology
- Human T-lymphotropic virus 1/metabolism
- Humans
- Jurkat Cells
- Leukemia-Lymphoma, Adult T-Cell/immunology
- Leukemia-Lymphoma, Adult T-Cell/metabolism
- Lymphocyte Activation
- Male
- Mice
- Receptors, Interleukin-9/immunology
- Receptors, Interleukin-9/metabolism
- Sequence Analysis, Protein/methods
- T-Lymphocytes, Helper-Inducer/immunology
- T-Lymphocytes, Helper-Inducer/metabolism
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Affiliation(s)
- Hiroya Kobayashi
- Department of Pathology, Asahikawa Medical University, Midorigaoka-Higashi 2-1-1, Asahikawa, 078-8510 Japan
| | - Takumi Kumai
- Department of Pathology, Asahikawa Medical University, Midorigaoka-Higashi 2-1-1, Asahikawa, 078-8510 Japan
| | - Satoshi Hayashi
- Department of Pathology, Asahikawa Medical University, Midorigaoka-Higashi 2-1-1, Asahikawa, 078-8510 Japan
| | - Yoshinari Matsuda
- Department of Pathology, Asahikawa Medical University, Midorigaoka-Higashi 2-1-1, Asahikawa, 078-8510 Japan
| | - Naoko Aoki
- Department of Pathology, Asahikawa Medical University, Midorigaoka-Higashi 2-1-1, Asahikawa, 078-8510 Japan
| | - Keisuke Sato
- Department of Pathology, Asahikawa Medical University, Midorigaoka-Higashi 2-1-1, Asahikawa, 078-8510 Japan
| | - Shoji Kimura
- Department of Pathology, Asahikawa Medical University, Midorigaoka-Higashi 2-1-1, Asahikawa, 078-8510 Japan
| | - Esteban Celis
- H. Lee Moffitt Cancer Center and Research Institute, 12902 Magnolia Drive, SRB2, Tampa, FL 33612 USA
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Winkler C, Steingrube DS, Altermann W, Schlaf G, Max D, Kewitz S, Emmer A, Kornhuber M, Banning-Eichenseer U, Staege MS. Hodgkin's lymphoma RNA-transfected dendritic cells induce cancer/testis antigen-specific immune responses. Cancer Immunol Immunother 2012; 61:1769-79. [PMID: 22419371 PMCID: PMC11029013 DOI: 10.1007/s00262-012-1239-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Accepted: 02/24/2012] [Indexed: 12/20/2022]
Abstract
Cytotoxic T lymphocytes (CTL) can kill Hodgkin's lymphoma (HL) cells, and CTL have been used for the treatment of Epstein-Barr virus (EBV)-positive HL. For patients with EBV-negative HL, this strategy cannot be employed and alternative target structures have to be defined. In order to establish a system for the stimulation of HL-reactive T cells, we used dendritic cells (DC) as antigen-presenting cells for autologous T cells and transfected these DC with RNA from established HL cell lines. After stimulation of peripheral blood mononuclear cells (PBMC) with RNA-transfected DC, we analyzed the reactivity of primed PBMC by interferon gamma enzyme-linked immunospot. Our results suggest the presence of antigens with expression in HL cell lines and recognition of these antigens in combination with DC-derived human leukocyte antigen molecules. By the analysis of Gene Expression Omnibus microarray data sets from HL cell lines and primary HL samples in comparison with testis and other normal tissues, we identified HL-associated cancer testis antigens (CTA) including the preferentially expressed antigen in melanoma (PRAME). After stimulation of PBMC with RNA-transfected DC, we detected PRAME-reactive T cells. PRAME and other HL-associated CTA might be targets for HL-specific immune therapy or for the monitoring of HL-directed immune responses.
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MESH Headings
- Antigens, Neoplasm/biosynthesis
- Antigens, Neoplasm/immunology
- Cell Line, Tumor
- Dendritic Cells/immunology
- Dendritic Cells/metabolism
- Enzyme-Linked Immunospot Assay
- Gene Expression Regulation, Neoplastic
- Hodgkin Disease/immunology
- Hodgkin Disease/metabolism
- Humans
- Leukocytes, Mononuclear/immunology
- Leukocytes, Mononuclear/metabolism
- Male
- RNA, Neoplasm/genetics
- RNA, Neoplasm/metabolism
- Sarcoma, Ewing/immunology
- Sarcoma, Ewing/metabolism
- Testis/immunology
- Testis/metabolism
- Transfection
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Affiliation(s)
- Carolin Winkler
- Department of Pediatrics, Martin-Luther-University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097 Halle, Germany
| | | | - Wolfgang Altermann
- HLA-Laboratory, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany
| | - Gerald Schlaf
- HLA-Laboratory, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany
| | - Daniela Max
- Department of Pediatrics, Martin-Luther-University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097 Halle, Germany
| | - Stefanie Kewitz
- Department of Pediatrics, Martin-Luther-University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097 Halle, Germany
| | - Alexander Emmer
- Department of Neurology, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany
| | - Malte Kornhuber
- Department of Neurology, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany
| | - Ursula Banning-Eichenseer
- Department of Pediatrics, Martin-Luther-University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097 Halle, Germany
| | - Martin Sebastian Staege
- Department of Pediatrics, Martin-Luther-University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097 Halle, Germany
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Keskin DB, Reinhold B, Lee SY, Zhang G, Lank S, O'Connor DH, Berkowitz RS, Brusic V, Kim SJ, Reinherz EL. Direct identification of an HPV-16 tumor antigen from cervical cancer biopsy specimens. Front Immunol 2011; 2:75. [PMID: 22566864 PMCID: PMC3342284 DOI: 10.3389/fimmu.2011.00075] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Accepted: 11/26/2011] [Indexed: 01/01/2023] Open
Abstract
Persistent infection with high-risk human papilloma viruses (HPV) is the worldwide cause of many cancers, including cervical, anal, vulval, vaginal, penile, and oropharyngeal. Since T cells naturally eliminate the majority of chronic HPV infections by recognizing epitopes displayed on virally altered epithelium, we exploited Poisson detection mass spectrometry (MS3) to identify those epitopes and inform future T cell-based vaccine design. Nine cervical cancer biopsies from HPV-16 positive HLA-A*02 patients were obtained, histopathology determined, and E7 oncogene PCR-amplified from tumor DNA and sequenced. Conservation of E7 oncogene coding segments was found in all tumors. MS3 analysis of HLA-A*02 immunoprecipitates detected E711–19 peptide (YMLDLQPET) in seven of the nine tumor biopsies. The remaining two samples were E711–19 negative and lacked the HLA-A*02 binding GILT thioreductase peptide despite possessing binding-competent HLA-A*02 alleles. Thus, the conserved E711–19 peptide is a dominant HLA-A*02 binding tumor antigen in HPV-16 transformed cervical squamous and adenocarcinomas. Findings that a minority of HLA-A*02:01 tumors lack expression of both E711–19 and a peptide from a thioreductase important in processing of cysteine-rich proteins like E7 underscore the value of physical detection, define a potential additional tumor escape mechanism and have implications for therapeutic cancer vaccine development.
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Transplantation of allogeneic hematopoietic stem cells for adult T-cell leukemia: a nationwide retrospective study. Blood 2010; 116:1369-76. [DOI: 10.1182/blood-2009-10-247510] [Citation(s) in RCA: 216] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Allogeneic hematopoietic stem cell transplantation (HSCT) is increasingly used as a curative option for adult T-cell leukemia (ATL), an intractable mature T-cell neoplasm causally linked with human T-cell leukemia virus type I (HTLV-I). We compared outcomes of 386 patients with ATL who underwent allogeneic HSCT using different graft sources: 154 received human leukocyte antigen (HLA)–matched related marrow or peripheral blood; 43 received HLA-mismatched related marrow or peripheral blood; 99 received unrelated marrow; 90 received single unit unrelated cord blood. After a median follow-up of 41 months (range, 1.5-102), 3-year overall survival for entire cohort was 33% (95% confidence interval, 28%-38%). Multivariable analysis revealed 4 recipient factors significantly associated with lower survival rates: older age (> 50 years), male sex, status other than complete remission, and use of unrelated cord blood compared with use of HLA-matched related grafts. Treatment-related mortality rate was higher among patients given cord blood transplants; disease-associated mortality was higher among male recipients or those given transplants not in remission. Among patients who received related transplants, donor HTLV-I seropositivity adversely affected disease-associated mortality. In conclusion, allogeneic HSCT using currently available graft source is an effective treatment in selected patients with ATL, although greater effort is warranted to reduce treatment-related mortality.
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Chi N, Maranchie JK, Appleman LJ, Storkus WJ. Update on vaccine development for renal cell cancer. Res Rep Urol 2010; 2:125-41. [PMID: 24198621 PMCID: PMC3703676 DOI: 10.2147/rru.s7242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Renal cell carcinoma (RCC) remains a significant health concern that frequently presents as metastatic disease at the time of initial diagnosis. Current first-line therapeutics for the advanced-stage RCC include antiangiogenic drugs that have yielded high rates of objective clinical response; however, these tend to be transient in nature, with many patients becoming refractory to chronic treatment with these agents. Adjuvant immunotherapies remain viable candidates to sustain disease-free and overall patient survival. In particular, vaccines designed to optimize the activation, maintenance, and recruitment of specific immunity within or into the tumor site continue to evolve. Based on the integration of increasingly refined immunomonitoring systems in both translational models and clinical trials, allowing for the improved understanding of treatment mechanism(s) of action, further refined (combinational) vaccine protocols are currently being developed and evaluated. This review provides a brief history of RCC vaccine development, discusses the successes and limitations in such approaches, and provides a rationale for developing combinational vaccine approaches that may provide improved clinical benefits to patients with RCC.
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Affiliation(s)
- Nina Chi
- Department of immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States
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Kpm/Lats2 is linked to chemosensitivity of leukemic cells through the stabilization of p73. Blood 2008; 112:3856-66. [PMID: 18565851 DOI: 10.1182/blood-2007-09-111773] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Down-regulation of the Kpm/Lats2 tumor suppressor is observed in various malignancies and associated with poor prognosis in acute lymphoblastic leukemia. We documented that Kpm/Lats2 was markedly decreased in several leukemias that were highly resistant to conventional chemotherapy. Silencing of Kpm/Lats2 expression in leukemic cells did not change the rate of cell growth but rendered the cells more resistant to DNA damage-inducing agents. Expression of p21 and PUMA was strongly induced by these agents in control cells, despite defective p53, but was only slightly induced in Kpm/Lats2-knockdown cells. DNA damage-induced nuclear accumulation of p73 was clearly observed in control cells but hardly detected in Kpm/Lats2-knockdown cells. Chromatin immunoprecipitation (ChIP) assay showed that p73 was recruited to the PUMA gene promoter in control cells but not in Kpm/Lats2-knockdown cells after DNA damage. The analyses with transient coexpression of Kpm/Lats2, YAP2, and p73 showed that Kpm/Lats2 contributed the stability of YAP2 and p73, which was dependent on the kinase function of Kpm/Lats2 and YAP2 phosphorylation at serine 127. Our results suggest that Kpm/Lats2 is involved in the fate of p73 through the phosphorylation of YAP2 by Kpm/Lats2 and the induction of p73 target genes that underlie chemosensitivity of leukemic cells.
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