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McMurry HS, Rivero JD, Chen EY, Kardosh A, Lopez CD, Pegna GJ. Gastroenteropancreatic neuroendocrine tumors: Epigenetic landscape and clinical implications. Curr Probl Cancer 2024; 52:101131. [PMID: 39173542 DOI: 10.1016/j.currproblcancer.2024.101131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Accepted: 05/22/2024] [Indexed: 08/24/2024]
Abstract
Neuroendocrine tumors (NETs) are a rare, heterogenous group of neoplasms arising from cells of the neuroendocrine system. Amongst solid tumor malignancies, NETs are notable for overall genetic stability and recent data supports the notion that epigenetic changes may drive NET pathogenesis. In this review, major epigenetic mechanisms of NET pathogenesis are reviewed, including changes in DNA methylation, histone modification, chromatin remodeling, and microRNA. Prognostic implications of the above are discussed, as well as the expanding diagnostic utility of epigenetic markers in NETs. Lastly, preclinical and clinical evaluations of epigenetically targeted therapies in NETs and are reviewed, with a focus on future directions in therapeutic advancement.
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Affiliation(s)
- Hannah S McMurry
- Department of Medicine, Division of Hematology and Medical Oncology, Oregon Health & Science University, Portland, OR, United States
| | - Jaydira Del Rivero
- Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Emerson Y Chen
- Department of Medicine, Division of Hematology and Medical Oncology, Oregon Health & Science University, Portland, OR, United States
| | - Adel Kardosh
- Department of Medicine, Division of Hematology and Medical Oncology, Oregon Health & Science University, Portland, OR, United States
| | - Charles D Lopez
- Department of Medicine, Division of Hematology and Medical Oncology, Oregon Health & Science University, Portland, OR, United States
| | - Guillaume J Pegna
- Department of Medicine, Division of Hematology and Medical Oncology, Oregon Health & Science University, Portland, OR, United States.
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2
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Saleh Z, Moccia MC, Ladd Z, Joneja U, Li Y, Spitz F, Hong YK, Gao T. Pancreatic Neuroendocrine Tumors: Signaling Pathways and Epigenetic Regulation. Int J Mol Sci 2024; 25:1331. [PMID: 38279330 PMCID: PMC10816436 DOI: 10.3390/ijms25021331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 01/12/2024] [Accepted: 01/16/2024] [Indexed: 01/28/2024] Open
Abstract
Pancreatic neuroendocrine tumors (PNETs) are characterized by dysregulated signaling pathways that are crucial for tumor formation and progression. The efficacy of traditional therapies is limited, particularly in the treatment of PNETs at an advanced stage. Epigenetic alterations profoundly impact the activity of signaling pathways in cancer development, offering potential opportunities for drug development. There is currently a lack of extensive research on epigenetic regulation in PNETs. To fill this gap, we first summarize major signaling events that are involved in PNET development. Then, we discuss the epigenetic regulation of these signaling pathways in the context of both PNETs and commonly occurring-and therefore more extensively studied-malignancies. Finally, we will offer a perspective on the future research direction of the PNET epigenome and its potential applications in patient care.
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Affiliation(s)
- Zena Saleh
- Department of Surgery, Cooper University Health Care, Camden, NJ 08103, USA; (Z.S.); (Z.L.)
| | - Matthew C. Moccia
- Department of Surgery, Cooper University Health Care, Camden, NJ 08103, USA; (Z.S.); (Z.L.)
| | - Zachary Ladd
- Department of Surgery, Cooper University Health Care, Camden, NJ 08103, USA; (Z.S.); (Z.L.)
| | - Upasana Joneja
- Department of Pathology, Cooper University Health Care, Camden, NJ 08103, USA
| | - Yahui Li
- Department of Surgery, Cooper University Health Care, Camden, NJ 08103, USA; (Z.S.); (Z.L.)
| | - Francis Spitz
- Department of Surgery, Cooper University Health Care, Camden, NJ 08103, USA; (Z.S.); (Z.L.)
| | - Young Ki Hong
- Department of Surgery, Cooper University Health Care, Camden, NJ 08103, USA; (Z.S.); (Z.L.)
| | - Tao Gao
- Department of Surgery, Cooper University Health Care, Camden, NJ 08103, USA; (Z.S.); (Z.L.)
- Camden Cancer Research Center, Camden, NJ 08103, USA
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Fan S, Zheng H, Zhan Y, Luo J, Zang H, Wang H, Wang W, Xu Y. Somatostatin receptor2 (SSTR2) expression, prognostic implications, modifications and potential therapeutic strategies associates with head and neck squamous cell carcinomas. Crit Rev Oncol Hematol 2024; 193:104223. [PMID: 38036157 DOI: 10.1016/j.critrevonc.2023.104223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 11/13/2023] [Accepted: 11/24/2023] [Indexed: 12/02/2023] Open
Abstract
Head and neck squamous cell carcinomas (HNSCC) constitute a heterogeneous cluster of tumors celebrated for their predisposition to metastasize and exhibit local recurrence. Recent explorations have illuminated the intricate involvement of Somatostatin Receptor 2 (SSTR2), a growth-regulatory receptor traditionally classified as a tumor suppressor, yet concurrently implicated in bolstering specific tumor phenotypes. Advances in the realm of SSTR2 investigation within HNSCC, with a specific spotlight on laryngeal squamous cell carcinomas (LSCC), tongue squamous cell carcinomas (TSCC), and nasopharyngeal carcinomas (NPC), have been established. This study aims to provide a comprehensive overview of SSTR2 expression patterns, prognostic implications, distinctive signaling pathways, epigenetic modifications, and potential therapeutic strategies associated with SSTR2 in HNSCC.
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Affiliation(s)
- Songqing Fan
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Hunan Clinical Medical Research Center for Cancer Pathogenic Genes Testing and Diagnosis, Changsha, Hunan 410011, China
| | - Hongmei Zheng
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Hunan Clinical Medical Research Center for Cancer Pathogenic Genes Testing and Diagnosis, Changsha, Hunan 410011, China
| | - Yuting Zhan
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Hunan Clinical Medical Research Center for Cancer Pathogenic Genes Testing and Diagnosis, Changsha, Hunan 410011, China
| | - Jiadi Luo
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Hunan Clinical Medical Research Center for Cancer Pathogenic Genes Testing and Diagnosis, Changsha, Hunan 410011, China
| | - Hongjing Zang
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Hunan Clinical Medical Research Center for Cancer Pathogenic Genes Testing and Diagnosis, Changsha, Hunan 410011, China
| | - Huilin Wang
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Hunan Clinical Medical Research Center for Cancer Pathogenic Genes Testing and Diagnosis, Changsha, Hunan 410011, China
| | - Weiyuan Wang
- Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Yue Xu
- Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China; Hunan Clinical Medical Research Center for Cancer Pathogenic Genes Testing and Diagnosis, Changsha, Hunan 410011, China.
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Murphy R, Chander G, Martinez M, Ward C, Khan SR, Naik M, Barwick T, Aboagye E, Sharma R. Study protocol of LANTana: a phase Ib study to investigate epigenetic modification of somatostatin receptor-2 with ASTX727 to improve therapeutic outcome with [177Lu]Lu-DOTA-TATE in patients with metastatic neuroendocrine tumours, UK. BMJ Open 2023; 13:e075221. [PMID: 37879695 PMCID: PMC10603539 DOI: 10.1136/bmjopen-2023-075221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 09/25/2023] [Indexed: 10/27/2023] Open
Abstract
INTRODUCTION Suitability for peptide receptor radionuclide therapy (PRRT) for neuroendocrine neoplasia (NENs) depends on presence of somatostatin receptor-2 (SSTR2) determined by [68Ga]Ga-DOTA-peptide-positron emission tomography (PET). Some patients have low or no uptake on [68Ga]Ga-DOTA-peptide-PET, precluding PRRT. The upstream promoter region of SSRT2 is methylated, with percentage of methylation correlating with SSTR2 expression. Demethylating agents increase uptake on PET imaging in vivo such that tumours previously negative on PET become positive, correlating with a dose dependent increase in tumorous SSTR2 expression. LANTana will determine whether treatment with the demethylating agent, ASTX727, results in re-expression of SSTR2 using [68Ga]Ga-DOTA-peptide-PET to image epigenetic modification of the SSTR2 locus, allowing subsequent PRRT. METHODS AND ANALYSIS 27 participants with a histological diagnosis of NEN (Ki67<55%) with no or low uptake on baseline [68Ga]Ga-DOTA-TATE-PET/CT will be recruited. Patients will receive 5 days of ASTX727 (fixed dose 35 mg decitabine+100 mg cedazuridine). [68Ga]Ga-DOTA-peptide-PET/CT will be repeated day 8±2; where there is significant uptake greater than liver in most lesions, PRRT will be administered. Primary objective is to determine re-expression of SSTR2 on PET imaging. Tolerability, progression-free survival, overall response and quality of life will be assessed. Methylation in peripheral blood mononuclear cells and tumorous methylation will be evaluated. ETHICS AND DISSEMINATION LANTana has ethical approval from Leeds West Research Ethics Committee (REC Reference: 21/YH/0247).Sponsored by Imperial College London and funded by Advanced Accelerator Applications pharmaceuticals. Results will be presented at conferences and submitted to peer-reviewed journals for publication and will be available on ClinicalTrials.gov. TRIAL REGISTRATION NUMBERS EUDRACT number: 2020-003800-15, NCT05178693.
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Affiliation(s)
- Ravindhi Murphy
- Department of Surgery and Cancer, Hammersmith Hospital, London, UK
| | - Gurvin Chander
- Department of Surgery and Cancer, Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK
| | - Maria Martinez
- Department of Surgery and Cancer, Hammersmith Hospital, London, UK
| | - Caroline Ward
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Sairah R Khan
- Department of Nuclear Medicine, Hammersmith Hospital, London, UK
| | - Mitesh Naik
- Department of Nuclear Medicine, Hammersmith Hospital, London, UK
| | - Tara Barwick
- Department of Cancer and Surgery, Imperial College London, London, UK
- Department of Radiology, Imperial College Healthcare NHS Trust, London, UK
| | - Eric Aboagye
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Rohini Sharma
- Department of Surgery and Cancer, Hammersmith Hospital, London, UK
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Xu Y, Quan Z, Zhan Y, Wang H, Luo J, Wang W, Fan S. SSTR2 positively associates with EGFR and predicts poor prognosis in nasopharyngeal carcinoma. J Clin Pathol 2023:jcp-2023-208987. [PMID: 37758305 DOI: 10.1136/jcp-2023-208987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 09/01/2023] [Indexed: 10/03/2023]
Abstract
AIMS Epidermal growth factor receptor (EGFR) belongs to the receptor tyrosine kinases family and overexpression of EGFR has been linked to poor prognosis and cancer progression. Somatostatin receptor 2 (SSTR2) is a G-protein-coupled receptor (GPCR) with diverse biological functions in humans, and it is upregulated through the NF-KB signalling pathway in nasopharyngeal carcinomas (NPC). However, no studies have examined the EGFR and SSTR2 in NPC. This study aimed to investigate whether SSTR2 is associated with EGFR and clinicopathological features in NPC. METHODS Bioinformatics analysis was performed to assess the correlation between EGFR and SSTR2 based on the GEO database. The expression of SSTR2 and EGFR was evaluated by immunohistochemistry (IHC) in 491 cases of NPC and 50 cases of non-cancerous nasopharyngeal epithelium. RESULTS The bioinformatics analysis and IHC showed a positive correlation between SSTR2 and EGFR in NPC. High expression of SSTR2 and EGFR was significantly increased in NPC patients compared with non-cancerous nasopharyngeal epithelium. High expression of SSTR2 and/or EGFR was associated with a worse outcome and a higher risk of progression. The study found that patients receiving chemoradiotherapy (CR) with high expression of SSTR2, high expression of EGFR, and high coexpression of SSTR2 and EGFR had a poorer prognosis in both progression-free survival (PFS) and overall survival (OS). Interestingly, NPC patients with high expression of SSTR2, high expression of EGFR, high coexpression of EGFR and SSTR2, and EGFR/SSTR2 anyone high expression had a better prognosis with CR combined with targeted therapy. Cox multivariate analysis identified SSTR2 and EGFR as independent poor predictors of PFS. CONCLUSION Our study is the first to shed light on the intricate relationship between SSTR2 and EGFR in NPC and provides new insights into the potential benefits of EGFR targeted therapy for patients with high SSTR2 expression. Additionally, SSTR2 has potential as a new biomarker for poor prognosis in NPC patients.
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Affiliation(s)
- Yue Xu
- Pathology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Zihan Quan
- Pathology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Yuting Zhan
- Pathology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Haihua Wang
- Pathology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Jiadi Luo
- Pathology, The Second Xiangya Hospital of Central South University, Changsha, China
| | - Weiyuan Wang
- Pathology, Xiangya Hospital of Central South University, Changsha, China
| | - Songqing Fan
- Pathology, The Second Xiangya Hospital of Central South University, Changsha, China
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Singh S, Hope TA, Bergsland EB, Bodei L, Bushnell DL, Chan JA, Chasen BR, Chauhan A, Das S, Dasari A, Del Rivero J, El-Haddad G, Goodman KA, Halperin DM, Lewis MA, Lindwasser OW, Myrehaug S, Raj NP, Reidy-Lagunes DL, Soares HP, Strosberg JR, Kohn EC, Kunz PL. Consensus report of the 2021 National Cancer Institute neuroendocrine tumor clinical trials planning meeting. J Natl Cancer Inst 2023; 115:1001-1010. [PMID: 37255328 PMCID: PMC10483264 DOI: 10.1093/jnci/djad096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 05/01/2023] [Accepted: 05/11/2023] [Indexed: 06/01/2023] Open
Abstract
Important progress has been made over the last decade in the classification, imaging, and treatment of neuroendocrine neoplasm (NENs), with several new agents approved for use. Although the treatment options available for patients with well-differentiated neuroendocrine tumors (NETs) have greatly expanded, the rapidly changing landscape has presented several unanswered questions about how best to optimize, sequence, and individualize therapy. Perhaps the most important development over the last decade has been the approval of 177Lu-DOTATATE for treatment of gastroenteropancreatic-NETs, raising questions around optimal sequencing of peptide receptor radionuclide therapy (PRRT) relative to other therapeutic options, the role of re-treatment with PRRT, and whether PRRT can be further optimized through use of dosimetry among other approaches. The NET Task Force of the National Cancer Institute GI Steering Committee convened a clinical trial planning meeting in 2021 with multidisciplinary experts from academia, the federal government, industry, and patient advocates to develop NET clinical trials in the era of PRRT. Key clinical trial recommendations for development included 1) PRRT re-treatment, 2) PRRT and immunotherapy combinations, 3) PRRT and DNA damage repair inhibitor combinations, 4) treatment for liver-dominant disease, 5) treatment for PRRT-resistant disease, and 6) dosimetry-modified PRRT.
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Affiliation(s)
- Simron Singh
- Department of Medicine, Sunnybrook Health Sciences Centre, Odette Cancer Center, University of Toronto, Toronto, ON, Canada
| | - Thomas A Hope
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, USA
| | - Emily B Bergsland
- Department of Medicine, University of California, San Francisco, CA, USA
| | - Lisa Bodei
- Department of Radiology, Memorial Sloan Kettering Cancer Center, Molecular Imaging and Therapy Service, New York, NY, USA
| | | | - Jennifer A Chan
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA
| | - Beth R Chasen
- Department of Nuclear Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Aman Chauhan
- Department of Medicine, University of Miami Sylvester Comprehensive Cancer Center, Miami, FL, USA
| | - Satya Das
- Late-Stage Development, Oncology R&D AstraZeneca, Gaithersburg, MD, USA
| | - Arvind Dasari
- Department of GI Oncology, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jaydira Del Rivero
- Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Ghassan El-Haddad
- Department of Diagnostic Imaging and Interventional Radiology, Moffitt Cancer Center, Tampa, FL, USA
| | - Karyn A Goodman
- Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, Tisch Cancer Institute, New York, NY, USA
| | - Daniel M Halperin
- Department of GI Oncology, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Mark A Lewis
- Department of Medicine, Intermountain Health, Salt Lake City, UT, USA
| | - O Wolf Lindwasser
- Coordinating Center for Clinical Trials, National Cancer Institute, Bethesda, MD, USA
| | - Sten Myrehaug
- Department of Radiation Oncology, Sunnybrook Health Sciences Centre, Odette Cancer Center, Toronto, ON, Canada
| | - Nitya P Raj
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | | | - Heloisa P Soares
- Department of Medicine, Huntsman Cancer Institute at University of Utah, Salt Lake City, UT, USA
| | | | | | - Pamela L Kunz
- Department of Medicine, Yale University School of Medicine, New Haven, CT, USA
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Sharma R, Earla B, Baidoo KE, Zeiger MA, Madigan JP, Escorcia FE, Sadowski SM. Upregulation of Somatostatin Receptor Type 2 Improves 177Lu-DOTATATE Therapy in Receptor-Deficient Pancreatic Neuroendocrine Tumor Model. Mol Cancer Ther 2023; 22:1052-1062. [PMID: 37487000 PMCID: PMC10477832 DOI: 10.1158/1535-7163.mct-22-0798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 05/16/2023] [Accepted: 07/19/2023] [Indexed: 07/26/2023]
Abstract
Pancreatic neuroendocrine tumors (PNET) express high levels of somatostatin receptor type 2 (SSTR2), a unique target for both tumor imaging and therapy. This surface expression is lost in metastatic high-grade PNETs, making patients ineligible for SSTR2-targeted 177 Lutetium (Lu)-DOTATATE peptide receptor radionuclide therapy (PRRT), and represents an unmet clinical need. Here, we aimed to restore SSTR2 expression through the reversal of inhibitory epigenetic gene silencing to improve tumor responsiveness to PRRT. We first assessed human SSTR2 promoter methylation and expression levels in 96 patient samples. We then used three NET cell lines (QGP-1, BON-1, GOT-1) with variable SSTR2 expression profiles for functional in vitro studies using histone deacetylase inhibitors (HDACi). Finally, the QGP-1 xenograft mouse model, with low basal SSTR2 expression, was used to assess the therapeutic efficacy of combined HDACi and 177Lu-DOTATATE therapies. We confirm that SSTR expression is decreased and correlates with SSTR2 promoter methylation in patients with high-grade NETs. When exposed to HDACis, SSTR2 surface expression is increased in three NET cell lines in vitro. In an in vivo PNET xenograft model with low basal SSTR2 expression, our studies demonstrate significantly higher tumor uptake of SSTR2-targeted 177Lu-DOTATATE in animals pretreated with HDACis compared with controls. For the first time, we show that this higher tumor uptake results in significant antitumor response when compared with standard PRRT alone. These preclinical results provide a rationale for utilizing HDACi pretreatment to improve targeted radionuclide therapy in patients with SSTR2-negative, metastatic PNETs.
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Affiliation(s)
- Rupali Sharma
- Endocrine Surgery Section, Surgical Oncology Program, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
| | - Bhargav Earla
- Endocrine Surgery Section, Surgical Oncology Program, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
- UAB Heersink School of Medicine, Birmingham, Alabama
| | - Kwamena E. Baidoo
- Molecular Imaging Branch, Radiation Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
| | - Martha A. Zeiger
- Office of Surgeon Scientists Programs, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
| | - James P. Madigan
- Endocrine Surgery Section, Surgical Oncology Program, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
| | - Freddy E. Escorcia
- Molecular Imaging Branch, Radiation Oncology Branch, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
| | - Samira M. Sadowski
- Endocrine Surgery Section, Surgical Oncology Program, Center for Cancer Research, NCI, NIH, Bethesda, Maryland
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Kim H, Lee K, Shim YM, Kim EE, Kim SK, Phi JH, Park CK, Choi SH, Park SH. Epigenetic Alteration of H3K27me3 as a Possible Oncogenic Mechanism of Central Neurocytoma. J Transl Med 2023; 103:100159. [PMID: 37088465 DOI: 10.1016/j.labinv.2023.100159] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 04/11/2023] [Accepted: 04/13/2023] [Indexed: 04/25/2023] Open
Abstract
Central neurocytoma (CN) is a low-grade neuronal tumor that mainly arises from the lateral ventricle (LV). This tumor remains poorly understood in the sense that no driver gene aberrations have been identified thus far. We investigated immunomarkers in fetal and adult brains and 45 supratentorial periventricular tumors to characterize the biomarkers, cell of origin, and tumorigenesis of CN. All CNs occurred in the LV. A minority involved the third ventricle, but none involved the fourth ventricle. As expected, next-generation sequencing performed using a brain-tumor-targeted gene panel in 7 CNs and whole exome sequencing in 5 CNs showed no driver mutations. Immunohistochemically, CNs were robustly positive for FGFR3 (100%), SSTR2 (92%), TTF-1 (Nkx2.1) (88%), GLUT-1 (84%), and L1CAM (76%), in addition to the well-known markers of CN, synaptophysin (100%) and NeuN (96%). TTF-1 was also positive in subependymal giant cell astrocytomas (100%, 5/5) and the pituicyte tumor family, including pituicytoma and spindle cell oncocytoma (100%, 5/5). Interestingly, 1 case of LV subependymoma (20%, 1/5) was positive for TTF-1, but all LV ependymomas were negative (0/5 positive). Because TTF-1-positive cells were detected in the medial ganglionic eminence around the foramen of Monro of the fetal brain and in the subventricular zone of the LV of the adult brain, CN may arise from subventricular TTF-1-positive cells undergoing neuronal differentiation. H3K27me3 loss was observed in all CNs and one case (20%) of LV subependymoma, suggesting that chromatin remodeling complexes or epigenetic alterations may be involved in the tumorigenesis of all CNs and some ST-subependymomas. Further studies are required to determine the exact tumorigenic mechanism of CN.
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Affiliation(s)
- Hyunhee Kim
- Department of Pathology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Kwanghoon Lee
- Department of Pathology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yu-Mi Shim
- Department of Pathology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Eric Eunshik Kim
- Department of Pathology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seung-Ki Kim
- Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Ji Hoon Phi
- Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Chul-Kee Park
- Department of Neurosurgery, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seung Hong Choi
- Department of Radiology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Sung-Hye Park
- Department of Pathology, Seoul National University College of Medicine, Seoul, Republic of Korea; Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.
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9
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Klomp MJ, Refardt J, van Koetsveld PM, Campana C, Dalm SU, Dogan F, van Velthuysen MLF, Feelders RA, de Herder WW, Hofland J, Hofland LJ. Epigenetic regulation of SST 2 expression in small intestinal neuroendocrine tumors. Front Endocrinol (Lausanne) 2023; 14:1184436. [PMID: 37223009 PMCID: PMC10200989 DOI: 10.3389/fendo.2023.1184436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Accepted: 04/11/2023] [Indexed: 05/25/2023] Open
Abstract
Background Somatostatin receptor type 2 (SST2) expression is critical for the diagnosis and treatment of neuroendocrine tumors and is associated with improved patient survival. Recent data suggest that epigenetic changes such as DNA methylation and histone modifications play an important role in regulating SST2 expression and tumorigenesis of NETs. However, there are limited data on the association between epigenetic marks and SST2 expression in small intestinal neuroendocrine tumors (SI-NETs). Methods Tissue samples from 16 patients diagnosed with SI-NETs and undergoing surgical resection of the primary tumor at Erasmus MC Rotterdam were analysed for SST2 expression levels and epigenetic marks surrounding the SST2 promoter region, i.e. DNA methylation and histone modifications H3K27me3 and H3K9ac. As a control, 13 normal SI-tissue samples were included. Results The SI-NET samples had high SST2 protein and mRNA expression levels; a median (IQR) of 80% (70-95) SST2-positive cells and 8.2 times elevated SST2 mRNA expression level compared to normal SI-tissue (p=0.0042). In comparison to normal SI-tissue, DNA methylation levels and H3K27me3 levels were significantly lower at five out of the eight targeted CpG positions and at two out of the three examined locations within the SST2 gene promoter region of the SI-NET samples, respectively. No differences in the level of activating histone mark H3K9ac were observed between matched samples. While no correlation was found between histone modification marks and SST2 expression, SST2 mRNA expression levels correlated negatively with DNA methylation within the SST2 promoter region in both normal SI-tissue and SI-NETs (p=0.006 and p=0.04, respectively). Conclusion SI-NETs have lower SST2 promoter methylation levels and lower H3K27me3 methylation levels compared to normal SI-tissue. Moreover, in contrast to the absence of a correlation with SST2 protein expression levels, significant negative correlations were found between SST2 mRNA expression level and the mean level of DNA methylation within the SST2 promoter region in both normal SI-tissue and SI-NET tissue. These results indicate that DNA methylation might be involved in regulating SST2 expression. However, the role of histone modifications in SI-NETs remains elusive.
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Affiliation(s)
- Maria J. Klomp
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
- ENETS Center of Excellence, Department of Radiology & Nuclear Medicine, Erasmus Medical Center, Rotterdam, Netherlands
| | - Julie Refardt
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
- ENETS Center of Excellence, Department of Endocrinology, University Hospital Basel, Basel, Switzerland
| | - Peter M. van Koetsveld
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
| | - Claudia Campana
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
- Endocrinology Unit, Department of Internal Medicine and Medical Specialties, School of Medical and Pharmaceutical Sciences, University of Genova, Genova, Italy
| | - Simone U. Dalm
- ENETS Center of Excellence, Department of Radiology & Nuclear Medicine, Erasmus Medical Center, Rotterdam, Netherlands
| | - Fadime Dogan
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
| | | | - Richard A. Feelders
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
| | - Wouter W. de Herder
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
| | - Johannes Hofland
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
| | - Leo J. Hofland
- ENETS Center of Excellence, Department of Internal Medicine, Section of Endocrinology, Erasmus Medical Center (MC) Cancer Institute, Rotterdam, Netherlands
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Angelousi A, Koumarianou A, Chatzellis E, Kaltsas G. Resistance of neuroendocrine tumours to somatostatin analogs. Expert Rev Endocrinol Metab 2023; 18:33-52. [PMID: 36651768 DOI: 10.1080/17446651.2023.2166488] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 01/05/2023] [Indexed: 01/13/2023]
Abstract
INTRODUCTION A common feature shared by most neuroendocrine tumors (NETs) is the expression on their surface of somatostatin receptors (SSTRs) that are essential for their pathophysiological regulation, diagnosis, and management. The first-generation synthetic somatostatin analogs (SSAs), octreotide and lanreotide, constitute the cornerstone of treatment for growth hormone secreting pituitary adenomas and functioning, progressive functioning, and non-functioning gastro-entero-pancreatic (GEP-NETs). SSAs exert their mechanism of action through binding to the SSTRs; however, their therapeutic response is frequently attenuated or diminished by the development of resistance. The phenomenon of resistance is complex implicating the presence of additional epigenetic and genetic mechanisms. AREAS COVERED We aim to analyze the molecular, genetic, and epigenetic mechanisms of resistance to SSA treatment. We also summarize recent clinical data related to the development of resistance on conventional and non-conventional modes of administration of the first-generation SSAs and the second-generation SSA pasireotide. We explore mechanisms used to counteract the resistance to SSAs using higher doses or more frequent mode of administration of SSAs and/or combination treatments. EXPERT OPINION There is considerable heterogeneity in the development of resistance to SSAs that is tumor-specific necessitating the delineation of the underlying pathophysiological processes to further expand their therapeutic applications.
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Affiliation(s)
- Anna Angelousi
- First Department of Internal Medicine, Unit of Endocrinology, Laikon General hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Anna Koumarianou
- Hematology Oncology Unit, Fourth Department of Internal Medicine, Attikon University Hospital, National and Kapodistrian University of Athens, Athens, Greece
| | - Eleftherios Chatzellis
- Endocrinology Diabetes and Metabolism Department, 251 Hellenic Air Force and VA General Hospital, Athens, Greece
| | - Gregory Kaltsas
- First Propaedeutic Department of Internal Medicine, Endocrine Unit, National and Kapodistrian University of Athens, Athens, Greece
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11
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Aberrant Methylation of Somatostatin Receptor 2 Gene Is Initiated in Aged Gastric Mucosa Infected with Helicobacter pylori and Consequential Gene Silencing Is Associated with Establishment of Inflammatory Microenvironment In Vitro Study. Cancers (Basel) 2022; 14:cancers14246183. [PMID: 36551669 PMCID: PMC9777158 DOI: 10.3390/cancers14246183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/29/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022] Open
Abstract
The loss-of-function variants are thought to be associated with inflammation in the stomach. We here aimed to evaluate the extent and role of methylation at the SSTR2 promoter in inflammation and gastric tumor formation. A whole-genome bisulfite sequencing analysis revealed that the SSTR2 promoter was significantly hypermethylated in gastric tumors, dysplasia, and intestinal metaplasia compared to non-tumor tissues from patients with gastric cancer. Using public data, we confirmed SSTR2 promoter methylation in primary gastric tumors and intestinal metaplasia, and even aged gastric mucosae infected with Helicobacter pylori, suggesting that aberrant methylation is initiated in normal gastric mucosa. The loss-of-function of SSTR2 in SNU638 cell-induced cell proliferation in vitro, while stable transfection of SSTR2 in AGS and MKN74 cells inhibited cell proliferation and tumorigenesis in vitro and in vivo. As revealed by a comparison of target genes differentially expressed in these cells with hallmark molecular signatures, inflammation-related pathways were distinctly induced in SSTR2-KO SNU638 cell. By contrast, inflammation-related pathways were inhibited in AGS and MKN74 cells ectopically expressing SSTR2. Collectively, we propose that SSTR2 silencing upon promoter methylation is initiated in aged gastric mucosae infected with H. pylori and promotes the establishment of an inflammatory microenvironment via the intrinsic pathway. These findings provide novel insights into the initiation of gastric carcinogenesis.
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12
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Epigenetic potentiation of somatostatin-2 by guadecitabine in neuroendocrine neoplasias as a novel method to allow delivery of peptide receptor radiotherapy. Eur J Cancer 2022; 176:110-120. [PMID: 36208569 DOI: 10.1016/j.ejca.2022.09.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 09/08/2022] [Indexed: 12/15/2022]
Abstract
BACKGROUND Somatostatin receptor-2 (SSTR2) is expressed on cell surface of neuroendocrine neoplasias; its presence is exploited for the delivery of peptide receptor radionuclide therapy (PRRT). Patients with no or low expression of SSTR2 are not candidates for PRRT. SSTR2 promotor undergoes epigenetic modification, known to regulate gene expression. We investigated whether the demethylation agent, guadecitabine, could enhance the expression of SSTR2 in NET models, using radioligand uptake/PET imaging as a biomarker of epigenetic modification. METHODS The effects of guadecitabine on the transcriptional, translational, and functional regulation of SSTR2 both in vitro and in vivo using low (QGP-1) and high (BON-1) methylated neuroendocrine neoplasia models was characterised. Promotor region methylation profiling of clinical samples (n = 61) was undertaken. Safety of combination guadecitabine and PRRT was assessed in vivo. RESULTS Pyrosequencing of cell lines illustrated differential methylation indices - BON: 1 94%, QGP: 1 21%. Following guadecitabine treatment, a dose-dependent increase in SSTR2 in BON-1 at a transcriptional, translational, and functional levels using the SSTR2-directed radioligand, 18F-FET-βAG-TOCA ([18F]-FETO) (150% increase [18F]-FETO uptake, p < 0.05) was observed. In vivo, guadecitabine treatment resulted in a 70% increase in [18F]-FETO uptake in BON-1 tumour models compared models with low baseline percentage methylation (p < 0.05). No additive toxicity was observed with the combination treatment of PRRT and guadecitabine in vivo. Methylation index in clinical samples was 10.5% compared to 5.2% in controls (p = 0.03) and correlated with SSTR2 expression (Wilcoxon rank sign -3.75,p < 0.01). CONCLUSION Guadecitabine increases SSTR2 expression both in vitro and in vivo. The combination of demethylation agents with PRRT warrants further investigation.
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13
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McClellan K, Chen EY, Kardosh A, Lopez CD, Del Rivero J, Mallak N, Rocha FG, Koethe Y, Pommier R, Mittra E, Pegna GJ. Therapy Resistant Gastroenteropancreatic Neuroendocrine Tumors. Cancers (Basel) 2022; 14:4769. [PMID: 36230691 PMCID: PMC9563314 DOI: 10.3390/cancers14194769] [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: 08/31/2022] [Revised: 09/24/2022] [Accepted: 09/28/2022] [Indexed: 11/16/2022] Open
Abstract
Gastroenteropancreatic neuroendocrine tumors (GEP-NETs) are a heterogenous group of malignancies originating from neuroendocrine cells of the gastrointestinal tract, the incidence of which has been increasing for several decades. While there has been significant progress in the development of therapeutic options for patients with advanced or metastatic disease, these remain limited both in quantity and durability of benefit. This review examines the latest research elucidating the mechanisms of both up-front resistance and the eventual development of resistance to the primary systemic therapeutic options including somatostatin analogues, peptide receptor radionuclide therapy with lutetium Lu 177 dotatate, everolimus, sunitinib, and temozolomide-based chemotherapy. Further, potential strategies for overcoming these mechanisms of resistance are reviewed in addition to a comprehensive review of ongoing and planned clinical trials addressing this important challenge.
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Affiliation(s)
- Kristen McClellan
- School of Medicine, Oregon Health & Science University, Portland, OR 97239, USA
| | - Emerson Y. Chen
- Division of Hematology Oncology, Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Adel Kardosh
- Division of Hematology Oncology, Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Charles D. Lopez
- Division of Hematology Oncology, Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Jaydira Del Rivero
- Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Nadine Mallak
- Division of Molecular Imaging and Therapy, Oregon Health & Science University, Portland, OR 97239, USA
| | - Flavio G. Rocha
- Division of Surgical Oncology, Department of Surgery, Oregon Health & Science University, Portland, OR 97239, USA
| | - Yilun Koethe
- Dotter Department of Interventional Radiology, Oregon Health & Science University, Portland, OR 97239, USA
| | - Rodney Pommier
- Division of Surgical Oncology, Department of Surgery, Oregon Health & Science University, Portland, OR 97239, USA
| | - Erik Mittra
- Division of Molecular Imaging and Therapy, Oregon Health & Science University, Portland, OR 97239, USA
| | - Guillaume J. Pegna
- Division of Hematology Oncology, Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97239, USA
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14
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Crabtree JS. Epigenetic Regulation in Gastroenteropancreatic Neuroendocrine Tumors. Front Oncol 2022; 12:901435. [PMID: 35747820 PMCID: PMC9209739 DOI: 10.3389/fonc.2022.901435] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 05/09/2022] [Indexed: 12/11/2022] Open
Abstract
Gastroenteropancreatic neuroendocrine neoplasms are a rare, diverse group of neuroendocrine tumors that form in the pancreatic and gastrointestinal tract, and often present with side effects due to hormone hypersecretion. The pathogenesis of these tumors is known to be linked to several genetic disorders, but sporadic tumors occur due to dysregulation of additional genes that regulate proliferation and metastasis, but also the epigenome. Epigenetic regulation in these tumors includes DNA methylation, chromatin remodeling and regulation by noncoding RNAs. Several large studies demonstrate the identification of epigenetic signatures that may serve as biomarkers, and others identify innovative, epigenetics-based targets that utilize both pharmacological and theranostic approaches towards the development of new treatment approaches.
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Epigenetic-Like Stimulation of Receptor Expression in SSTR2 Transfected HEK293 Cells as a New Therapeutic Strategy. Cancers (Basel) 2022; 14:cancers14102513. [PMID: 35626117 PMCID: PMC9140012 DOI: 10.3390/cancers14102513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/09/2022] [Accepted: 05/18/2022] [Indexed: 12/12/2022] Open
Abstract
Simple Summary Neuroendocrine tumors (NETs) expressing the somatostatin receptor subtype 2 (SSTR2) are promising targets for peptide receptor radionuclide therapy (PRRT) using the somatostatin analogue Lu-177-DOTATATE. Patients expressing low levels of SSTR2 do not benefit from PRRT. Therefore, an approach to increase the efficacy of PRRT utilizing the effects of 5-aza-2′-deoxycytidine (5-aza-dC) and valproic acid (VPA) on the SSTR2 expression levels is investigated. The cell lines HEKsst2 and PC3 are incubated with 5-aza-dC and VPA in different combinations. The drug pretreatment of HEKsst2 cells leads to increased Lu-177-DOTATATE uptake values (factor 28) and lower cell survival (factor 4) in comparison to unstimulated cells; in PC3 cells, the effects are negligible. Further, for the stimulated cell types, the maintenance of the intrinsic radiosensitivity in each cell type is confirmed by X-ray irradiation. The increased SSTR2 expression induced by VPA and 5-aza-dC stimulation in HEKsst2 cells might improve treatment strategies for patients with NETs. Abstract The aim of the study was to increase the uptake of the SSTR2-targeted radioligand Lu-177-DOTATATE using the DNA methyltransferase inhibitor (DNMTi) 5-aza-2′-deoxycytidine (5-aza-dC) and the histone deacetylase inhibitor (HDACi) valproic acid (VPA). The HEKsst2 and PC3 cells were incubated with variable concentrations of 5-aza-dC and VPA to investigate the uptake of Lu-177-DOTATATE. Cell survival, subsequent to external X-rays (0.6 or 1.2 Gy) and a 24 h incubation with 57.5 or 136 kBq/mL Lu-177-DOTATATE, was investigated via colony formation assay to examine the effect of the epidrugs. In the case of stimulated HEKsst2 cells, the uptake of Lu-177-DOTATATE increased by a factor of 28 in comparison to the unstimulated cells. Further, stimulated HEKsst2 cells demonstrated lower survival fractions (factor 4). The survival fractions of the PC3 cells remained almost unchanged. VPA and 5-aza-dC did not induce changes to the intrinsic radiosensitivity of the cells after X-ray irradiation. Clear stimulatory effects on HEKsst2 cells were demonstrated by increased cell uptake of the radioligand and enhanced SST2 receptor quantity. In conclusion, the investigated approach is suitable to stimulate the somatostatin receptor expression and thus the uptake of Lu-177-DOTATATE, enabling a more efficient treatment for patients with poor response to peptide radionuclide therapy (PRRT).
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16
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The Effect of VPA Treatment on Radiolabeled DOTATATE Uptake: Differences Observed In Vitro and In Vivo. Pharmaceutics 2022; 14:pharmaceutics14010173. [PMID: 35057069 PMCID: PMC8779846 DOI: 10.3390/pharmaceutics14010173] [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: 11/29/2021] [Revised: 01/05/2022] [Accepted: 01/08/2022] [Indexed: 11/30/2022] Open
Abstract
Background: To improve peptide receptor radionuclide therapy (PRRT), we aimed to enhance the expression of somatostatin type-2 receptors (SSTR2) in vitro and in vivo, using valproic acid (VPA). Methods: Human NCI-H69 small-cell lung carcinoma cells were treated with VPA, followed by [111In]In-DOTATATE uptake studies, RT-qPCR and immunohistochemistry analysis. Furthermore, NCI-H69 xenografted mice were treated with VPA or vehicle, followed by [177Lu]Lu-DOTATATE injection. Biodistribution studies were performed, and tissues were collected for further analysis. Results: VPA significantly increased SSTR2 expression in vitro. In animals, a statistically significant increased [177Lu]Lu-DOTATATE tumoral uptake was observed when VPA was administered eight hours before [177Lu]Lu-DOTATATE administration, but increased tumor SSTR2 expression levels were lacking. The animals also presented significantly higher [177Lu]Lu-DOTATATE blood levels, as well as an elevated renal tubular damage score. This suggests that the enhanced tumor uptake was presumably a consequence of the increased radiotracer circulation and the induced kidney damage. Conclusions: VPA increases SSTR2 expression in vitro. In vivo, the observed increase in tumoral [177Lu]Lu-DOTATATE uptake is not caused by SSTR2 upregulation, but rather by other mechanisms, e.g., an increased [177Lu]Lu-DOTATATE circulation time and renal toxicity. However, since both drugs are safely used in humans, the potential of VPA to improve PRRT remains open for investigation.
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17
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Comparing the Effect of Multiple Histone Deacetylase Inhibitors on SSTR2 Expression and [ 111In]In-DOTATATE Uptake in NET Cells. Cancers (Basel) 2021; 13:cancers13194905. [PMID: 34638389 PMCID: PMC8508045 DOI: 10.3390/cancers13194905] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/21/2021] [Accepted: 09/26/2021] [Indexed: 01/23/2023] Open
Abstract
Simple Summary Patients diagnosed with neuroendocrine tumors (NETs) are often treated with peptide receptor radionuclide therapy (PRRT). This therapy targets the somatostatin type-2 receptors (SSTR2) frequently overexpressed on these types of tumors. Although this therapy has proven to be effective, complete responses are rare and therapy improvement is desirable. We aimed to increase SSTR2 expression on NET cells, potentially increasing the number of patients eligible for SSTR2-targeted PRRT and improving clinical outcomes. We used histone deacetylase inhibitors (HDACis) to manipulate the epigenetic machinery and hereby aimed to increase SSTR2 gene transcription. Our results showed that the HDACis increased SSTR2 expression in several NET cell lines. Moreover, the uptake of radiolabeled DOTATATE, the tracer used for PRRT, was enhanced. The observed reversibility profile after HDACi withdrawal of the induced effects suggests that proper timing of HDACi treatment is likely essential. Abstract The aim of this study was to increase somatostatin type-2 receptor (SSTR2) expression on neuroendocrine tumor (NET) cells using histone deacetylase inhibitors (HDACis), potentially increasing the uptake of SSTR2-targeted radiopharmaceuticals and subsequently improving treatment efficacy of peptide receptor radionuclide therapy (PRRT). Human NET cell lines BON-1, NCI-H727, and GOT1 were treated with HDACis (i.e., CI-994, entinostat, LMK-235, mocetinostat, panobinostat, or valproic acid (VPA); entinostat and VPA were the HDACis tested in GOT1 cells) to examine SSTR2 mRNA expression levels and uptake of SSTR2-targeting radiotracer [111In]In-DOTATATE. Reversibility of the induced effects was examined after drug-withdrawal. Finally, the effect of VPA on radiosensitivity was investigated. A strong stimulatory effect in BON-1, NCI-H727, and GOT1 cells was observed after HDACi treatment, both on SSTR2 mRNA expression levels and [111In]In-DOTATATE uptake. The effects of the HDACis were largely reversible over a period of seven days, demonstrating largest reductions within the first day. The reversibility profile of the induced effects suggests that proper timing of HDACi treatment is most likely essential for a beneficial outcome. In addition to increasing SSTR2 expression levels, VPA enhanced the radiosensitivity of all cell lines. In conclusion, HDACi treatment increased SSTR2 expression, and radiosensitivity was also enhanced upon VPA treatment.
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18
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Klomp MJ, Dalm SU, de Jong M, Feelders RA, Hofland J, Hofland LJ. Epigenetic regulation of somatostatin and somatostatin receptors in neuroendocrine tumors and other types of cancer. Rev Endocr Metab Disord 2021; 22:495-510. [PMID: 33085037 PMCID: PMC8346415 DOI: 10.1007/s11154-020-09607-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/09/2020] [Indexed: 12/15/2022]
Abstract
Both somatostatin (SST) and somatostatin receptors (SSTRs) are proteins with important functions in both physiological tissue and in tumors, particularly in neuroendocrine tumors (NETs). NETs are frequently characterized by high SSTRs expression levels. SST analogues (SSAs) that bind and activate SSTR have anti-proliferative and anti-secretory activity, thereby reducing both the growth as well as the hormonal symptoms of NETs. Moreover, the high expression levels of SSTR type-2 (SSTR2) in NETs is a powerful target for therapy with radiolabeled SSAs. Due to the important role of both SST and SSTRs, it is of great importance to elucidate the mechanisms involved in regulating their expression in NETs, as well as in other types of tumors. The field of epigenetics recently gained interest in NET research, highlighting the importance of this process in regulating the expression of gene and protein expression. In this review we will discuss the role of the epigenetic machinery in controlling the expression of both SSTRs and the neuropeptide SST. Particular attention will be given to the epigenetic regulation of these proteins in NETs, whereas the involvement of the epigenetic machinery in other types of cancer will be discussed as well. In addition, we will discuss the possibility to target enzymes involved in the epigenetic machinery to modify the expression of the SST-system, thereby possibly improving therapeutic options.
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Affiliation(s)
- M J Klomp
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
- Department of Radiology & Nuclear Medicine, Erasmus MC, Rotterdam, The Netherlands
| | - S U Dalm
- Department of Radiology & Nuclear Medicine, Erasmus MC, Rotterdam, The Netherlands
| | - M de Jong
- Department of Radiology & Nuclear Medicine, Erasmus MC, Rotterdam, The Netherlands
| | - R A Feelders
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
| | - J Hofland
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
| | - L J Hofland
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands.
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Sharma R, Lythgoe MP, Slaich B, Patel N. Exploring the Epigenome in Gastroenteropancreatic Neuroendocrine Neoplasias. Cancers (Basel) 2021; 13:4181. [PMID: 34439335 PMCID: PMC8394968 DOI: 10.3390/cancers13164181] [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: 06/22/2021] [Revised: 08/06/2021] [Accepted: 08/17/2021] [Indexed: 11/17/2022] Open
Abstract
Gastroenteropancreatic neuroendocrine neoplasias are a diverse group of neoplasms with different characteristics in terms of site, biological behaviour and metastatic potential. In comparison to other cancers, they are genetically quiet, harbouring relatively few somatic mutations. It is increasingly becoming evident that epigenetic changes are as relevant, if not more so, as somatic mutations in promoting oncogenesis. Despite significant tumour heterogeneity, it is obvious that DNA methylation, histone and chromatin modifications and microRNA expression profiles are distinctive for GEP-NEN subtypes and may correlate with clinical outcome. This review summarises existing knowledge on epigenetic changes, identifying potential contributions to pathogenesis and oncogenesis. In particular, we focus on epigenetic changes pertaining to well-differentiated neuroendocrine tumours, which make up the bulk of NENs. We also highlight both similarities and differences within the subtypes of GEP-NETs and how these relate and compare to other types of cancers. We relate epigenetic understanding to existing treatments and explore how this knowledge may be exploited in the development of novel treatment approaches, such as in theranostics and combining conventional treatment modalities. We consider potential barriers to epigenetic research in GEP-NENs and discuss strategies to optimise research and development of new therapies.
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Affiliation(s)
- Rohini Sharma
- Department of Surgery and Cancer, Imperial College London, London W12 ONN, UK;
| | - Mark P. Lythgoe
- Department of Surgery and Cancer, Imperial College London, London W12 ONN, UK;
| | - Bhavandeep Slaich
- Department of Medicine, University of Leicester, Leicester LE1 7RH, UK; (B.S.); (N.P.)
| | - Nishil Patel
- Department of Medicine, University of Leicester, Leicester LE1 7RH, UK; (B.S.); (N.P.)
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Minczeles NS, Hofland J, de Herder WW, Brabander T. Strategies Towards Improving Clinical Outcomes of Peptide Receptor Radionuclide Therapy. Curr Oncol Rep 2021; 23:46. [PMID: 33721105 PMCID: PMC7960621 DOI: 10.1007/s11912-021-01037-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/26/2021] [Indexed: 02/07/2023]
Abstract
PURPOSE OF REVIEW Peptide receptor radionuclide therapy (PRRT) with [177Lu-DOTA0,Tyr3] octreotate is an effective and safe second- or third-line treatment option for patients with low-grade advanced gastroenteropancreatic (GEP) neuroendocrine neoplasms (NEN). In this review, we will focus on possible extensions of the current use of PRRT and on new approaches which could further improve its treatment efficacy and safety. RECENT FINDINGS Promising results were published regarding PRRT in other NENs, including lung NENs or high-grade NENs, and applying PRRT as neoadjuvant or salvage therapy. Furthermore, a diversity of strategic approaches, including dosimetry, somatostatin receptor antagonists, somatostatin receptor upregulation, radiosensitization, different radionuclides, albumin binding, alternative renal protection, and liver-directed therapy in combination with PRRT, have the potential to improve the outcome of PRRT. Also, novel biomarkers are presented that could predict response to PRRT. Multiple preclinical and early clinical studies have shown encouraging potential to advance the clinical outcome of PRRT in NEN patients. However, at this moment, most of these strategies have not yet reached the clinical setting of randomized phase III trials.
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Affiliation(s)
- N S Minczeles
- Department of Internal Medicine, Section of Endocrinology, Erasmus MC and Erasmus MC Cancer Center, Rotterdam, The Netherlands
- Department of Radiology & Nuclear Medicine, Erasmus MC, Rotterdam, The Netherlands
- ENETS Center of Excellence Rotterdam, Rotterdam, The Netherlands
| | - J Hofland
- Department of Internal Medicine, Section of Endocrinology, Erasmus MC and Erasmus MC Cancer Center, Rotterdam, The Netherlands
- ENETS Center of Excellence Rotterdam, Rotterdam, The Netherlands
| | - W W de Herder
- Department of Internal Medicine, Section of Endocrinology, Erasmus MC and Erasmus MC Cancer Center, Rotterdam, The Netherlands
- ENETS Center of Excellence Rotterdam, Rotterdam, The Netherlands
| | - T Brabander
- Department of Radiology & Nuclear Medicine, Erasmus MC, Rotterdam, The Netherlands.
- ENETS Center of Excellence Rotterdam, Rotterdam, The Netherlands.
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21
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Thakur S, Daley B, Millo C, Cochran C, Jacobson O, Lu H, Wang Z, Kiesewetter D, Chen X, Vasko V, Klubo-Gwiezdzinska J. 177Lu-DOTA-EB-TATE, a Radiolabeled Analogue of Somatostatin Receptor Type 2, for the Imaging and Treatment of Thyroid Cancer. Clin Cancer Res 2020; 27:1399-1409. [PMID: 33355247 DOI: 10.1158/1078-0432.ccr-20-3453] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/06/2020] [Accepted: 12/15/2020] [Indexed: 11/16/2022]
Abstract
PURPOSE The goal of this study was to analyze the role of somatostatin receptor type 2 (SSTR2) as a molecular target for the imaging and treatment of thyroid cancer through analysis of SSTR2 expression and its epigenetic modulation and testing tumor uptake of different radiolabeled SSTR2 analogues. EXPERIMENTAL DESIGN We analyzed SSTR2 expression by immunostaining of 92 thyroid cancer tissue samples and quantified standard uptake values (SUVmax) of SSTR2 analogue, 68Ga-DOTA-TATE, by PET/CT imaging in 25 patients with metastatic thyroid cancer. We utilized human thyroid cancer cell lines characterized by differential SSTR2 expression (TT, BCPAP, and FTC133) and rat pancreatic cell line (AR42J) with intrinsically high SSTR2 expression for functional in vitro studies. SSTR2-high (AR42J) and SSTR2-low (FTC133) xenograft mouse models were used to test the uptake of radiolabeled SSTR2 analogues and their therapeutic efficacy in vivo. RESULTS Thyroid cancer had a higher SSTR2 expression than normal thyroid. Hurthle cell thyroid cancer was characterized by the highest 68Ga-DOTA-TATE uptake [median SUVmax, 16.5 (7.9-29)] than other types of thyroid cancers. In vivo studies demonstrated that radiolabeled DOTA-EB-TATE is characterized by significantly higher tumor uptake than DOTA-TATE (P < 0.001) and DOTA-JR11 (P < 0.001). Treatment with 177Lu-DOTA-EB-TATE extended survival and reduced tumor size in a mouse model characterized by high somatostatin (SST) analogues uptake (SUVmax, 15.16 ± 4.34), but had no effects in a model with low SST analogues uptake (SUVmax, 4.8 ± 0.27). CONCLUSIONS A novel SST analogue, 177Lu-DOTA-EB-TATE, has the potential to be translated from bench to bedside for the targeted therapy of patients characterized by high uptake of SST analogues in metastatic lesions.
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Affiliation(s)
- Shilpa Thakur
- Metabolic Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland
| | - Brianna Daley
- Metabolic Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland
| | | | - Craig Cochran
- Metabolic Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland
| | - Orit Jacobson
- Molecular Tracer and Imaging Core Facility, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, Maryland
| | - Huiyan Lu
- National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland
| | - Zhantong Wang
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, Maryland
| | - Dale Kiesewetter
- Molecular Tracer and Imaging Core Facility, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, Maryland
| | - Xiaoyuan Chen
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, Maryland
| | - Vasyl Vasko
- Department of Pediatric Endocrinology, Uniformed Services of the Health Sciences, Bethesda, Maryland
| | - Joanna Klubo-Gwiezdzinska
- Metabolic Disease Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, Maryland.
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Jin XF, Auernhammer CJ, Ilhan H, Lindner S, Nölting S, Maurer J, Spöttl G, Orth M. Combination of 5-Fluorouracil with Epigenetic Modifiers Induces Radiosensitization, Somatostatin Receptor 2 Expression, and Radioligand Binding in Neuroendocrine Tumor Cells In Vitro. J Nucl Med 2019; 60:1240-1246. [DOI: 10.2967/jnumed.118.224048] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Accepted: 02/06/2019] [Indexed: 02/06/2023] Open
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Günther T, Tulipano G, Dournaud P, Bousquet C, Csaba Z, Kreienkamp HJ, Lupp A, Korbonits M, Castaño JP, Wester HJ, Culler M, Melmed S, Schulz S. International Union of Basic and Clinical Pharmacology. CV. Somatostatin Receptors: Structure, Function, Ligands, and New Nomenclature. Pharmacol Rev 2019; 70:763-835. [PMID: 30232095 PMCID: PMC6148080 DOI: 10.1124/pr.117.015388] [Citation(s) in RCA: 132] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Somatostatin, also known as somatotropin-release inhibitory factor, is a cyclopeptide that exerts potent inhibitory actions on hormone secretion and neuronal excitability. Its physiologic functions are mediated by five G protein-coupled receptors (GPCRs) called somatostatin receptor (SST)1-5. These five receptors share common structural features and signaling mechanisms but differ in their cellular and subcellular localization and mode of regulation. SST2 and SST5 receptors have evolved as primary targets for pharmacological treatment of pituitary adenomas and neuroendocrine tumors. In addition, SST2 is a prototypical GPCR for the development of peptide-based radiopharmaceuticals for diagnostic and therapeutic interventions. This review article summarizes findings published in the last 25 years on the physiology, pharmacology, and clinical applications related to SSTs. We also discuss potential future developments and propose a new nomenclature.
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Affiliation(s)
- Thomas Günther
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Giovanni Tulipano
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Pascal Dournaud
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Corinne Bousquet
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Zsolt Csaba
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Hans-Jürgen Kreienkamp
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Amelie Lupp
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Márta Korbonits
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Justo P Castaño
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Hans-Jürgen Wester
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Michael Culler
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Shlomo Melmed
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
| | - Stefan Schulz
- Institute of Pharmacology and Toxicology, Jena University Hospital, Friedrich-Schiller-University, Jena, Germany (T.G., A.L., S.S.); Unit of Pharmacology, Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy (G.T.); PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France (P.D., Z.C.); Cancer Research Center of Toulouse, INSERM UMR 1037-University Toulouse III Paul Sabatier, Toulouse, France (C.B.); Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (H.-J.K.); Centre for Endocrinology, William Harvey Research Institute, Barts and London School of Medicine, Queen Mary University of London, London, United Kingdom (M.K.); Maimonides Institute for Biomedical Research of Cordoba, Córdoba, Spain (J.P.C.); Department of Cell Biology, Physiology, and Immunology, University of Córdoba, Córdoba, Spain (J.P.C.); Reina Sofia University Hospital, Córdoba, Spain (J.P.C.); CIBER Fisiopatología de la Obesidad y Nutrición, Córdoba, Spain (J.P.C.); Pharmaceutical Radiochemistry, Technische Universität München, Munich, Germany (H.-J.W.); Culler Consulting LLC, Hopkinton, Massachusetts (M.C.); and Pituitary Center, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (S.M.)
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Lu YY, Gao JH, Zhao C, Wen SL, Tang CW, Wang YF. Cyclooxygenase-2 up-regulates hepatic somatostatin receptor 2 expression. Sci Rep 2018; 8:11033. [PMID: 30038293 PMCID: PMC6056476 DOI: 10.1038/s41598-018-29349-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 07/09/2018] [Indexed: 02/05/2023] Open
Abstract
Somatostatin and its analogues, which function by binding to somatostatin receptors (SSTRs) 1-5, play a protective role in liver cirrhosis. Hepatic SSTR-2 expression is up-regulated in subjects with liver cirrhosis. However, little is known about the mechanisms underlying this process. In the present study, we observed the up-regulation of hepatic SSTR-2 expression in thioacetamide (TAA)-induced cirrhotic rats and further showed that cyclooxygenase-2 (COX-2) might play a role in this process via the protein kinase C (PKC)-cAMP response element binding protein (CREB) signaling pathway. In vivo, the up-regulated SSTR-2 in liver cirrhosis was inhibited by the addition of a selective COX-2 inhibitor, such as celecoxib. In vitro, the up-regulation of COX-2 by either transfection with COX-2 plasmids or treatment with TAA increased levels of SSTR-2 and phosphorylated CREB (p-CREB) in the human hepatocyte cell line L02. Furthermore, the increase in SSTR-2 expression was inhibited by the addition of celecoxib and a PKC inhibitor. Moreover, for comparable DNA methylation levels in the region upstream of the hepatic SSTR-2 gene in normal and cirrhotic livers, DNA methylation may not contribute to the up-regulation of SSTR-2 expression in cirrhotic livers. In conclusion, the up-regulation of hepatic SSTR-2 might be induced by COX-2 via the PKC-CREB signaling pathway but is probably not induced by DNA methylation.
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Affiliation(s)
- Yao-Yao Lu
- Division of Peptides Related with Human Diseases, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China.,Department of Gastroenterology, The First Affiliated Hospital of Chengdu Medical College, Chengdu, China
| | - Jin-Hang Gao
- Division of Peptides Related with Human Diseases, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China.,Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu, China.,Division of Digestive Diseases, West China Hospital, Sichuan University, Chengdu, China
| | - Chong Zhao
- Division of Peptides Related with Human Diseases, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China.,Division of Digestive Diseases, West China Hospital, Sichuan University, Chengdu, China
| | - Shi-Lei Wen
- Department of Human Anatomy, Academy of Preclinical and Forensic Medicine, West China Medicine College, Sichuan University, Chengdu, China
| | - Cheng-Wei Tang
- Division of Peptides Related with Human Diseases, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China. .,Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu, China. .,Division of Digestive Diseases, West China Hospital, Sichuan University, Chengdu, China.
| | - Yu-Fang Wang
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu, China.
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25
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Gailhouste L, Liew LC, Hatada I, Nakagama H, Ochiya T. Epigenetic reprogramming using 5-azacytidine promotes an anti-cancer response in pancreatic adenocarcinoma cells. Cell Death Dis 2018; 9:468. [PMID: 29700299 PMCID: PMC5920091 DOI: 10.1038/s41419-018-0487-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 03/09/2018] [Accepted: 03/14/2018] [Indexed: 12/13/2022]
Abstract
Curative management of pancreatic adenocarcinoma is limited because this malignancy remains resistant to most chemotherapeutic drugs. Strategies that reverse epigenetic alterations offer a unique opportunity for cancer cell reprogramming, which is valuable for development of new treatments. The aim of this work was to reprogram pancreatic ductal adenocarcinoma (PDAC) cells toward a less aggressive and drug-responsive phenotype. The process applied is called "epigenetic reprogramming". To evaluate the efficiency of PDAC epigenetic reprogramming, we assessed tumor growth and drug response in PANC-1 cells after exposure to non-cytotoxic doses of the demethylating agent 5-azacytidine (5-AZA). Here, we showed that an epigenetic regimen using 5-AZA promoted an anti-cancer response by inhibiting PDAC tumor growth in vivo after the engraftment of treated cells. Remarkably, the subsequent addition of gemcitabine (GEM) to the 5-AZA-mediated reprogramming resulted in a marked growth inhibition effect in GEM-resistant pancreatic cancer cells. We observed that various characteristic peptides expressed in the pancreas, which included the antiproliferative hormone somatostatin (SST) and the SST receptor 2 (SSTR2), were significantly upregulated in the epigenetically reprogrammed PDAC cells. The inhibitory effect of octreotide (OCT), an SST analog, was tested on PDAC cells and found to be improved after cell reprogramming. Furthermore, we found that SST gene expression restoration following 5-AZA treatment or following knockdown of the DNA methyltransferase (DNMT) 1 enzyme was associated with the reversion of SST epigenetic silencing through regional CpG demethylation. Lastly, we confirmed the efficacy of 5-AZA-based epigenetic reprogramming in vivo using a PDAC tumor growth model. In conclusion, this study demonstrates that epigenetic reprogramming using the demethylating compound 5-AZA shows anti-cancer effects in PANC-1 cells and is potentially attractive for the treatment of solid tumors.
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Affiliation(s)
- Luc Gailhouste
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Tokyo, Japan.
| | - Lee Chuen Liew
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Tokyo, Japan
- Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Izuho Hatada
- Laboratory of Genome Science, Biosignal Genome Resource Center, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Japan
| | - Hitoshi Nakagama
- Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- National Cancer Center, Tokyo, Japan
| | - Takahiro Ochiya
- Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Tokyo, Japan.
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26
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Carmona-Bayonas A, Jiménez-Fonseca P, Custodio A, Grande E, Capdevila J, López C, Teule A, Garcia-Carbonero R. Optimizing Somatostatin Analog Use in Well or Moderately Differentiated Gastroenteropancreatic Neuroendocrine Tumors. Curr Oncol Rep 2017; 19:72. [PMID: 28920153 DOI: 10.1007/s11912-017-0633-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Somatostatin analogues, aiming to control tumor secretion or growth, constitute the most attractive therapeutic option for patients with well-differentiated gastroenteropancreatic neuroendocrine tumors (GEP-NETs). The objective of this article is to provide a comprehensive review of the current state-of-the-art knowledge gaps and potential opportunities for future development and optimization of this therapeutic modality. METHOD A contextualized systematic review with a narrative component was conducted using PubMed, The Cochrane Library, EMBASE, and Google Scholar. Titles were screened, and non-English, duplicate, or irrelevant entries were excluded. Selection criteria for articles included the following: publication in English between 1995 and 2016, patients with GEP-NETs, analysis of efficacy, safety, practical management considerations, predictive factors, and/or strategies for overcoming resistance, concerning somatostatin analogs. RESULTS Ninety-seven studies out of 2771 screened publications met the inclusion criteria (16 randomized clinical trials, 27 phase II trials, 3 phase I trials, 3 subgroup analyses of clinical trials, 1 open-label extension of a randomized trial, 1 phase IV trial, 32 observational studies, and 14 basic research articles). The nature and scope of literature was diverse with most articles dedicated to drug efficacy or indications of use (n = 49), pharmacological issues (n = 8), assessment or predictors of response (n = 4), practical management (n = 11), combination therapy or other means to overcome resistance (n = 19), receptors and signaling pathways (n = 3), and subgroup analyses (n = 3). CONCLUSION In this appraisal, we have found some practical aspects that can help to the optimization of somatostatin analog (SSA) therapy in patients with well-differentiated GEP-NETs. We have also identified areas of uncertainty in an effort to guide clinical research in the coming years.
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Affiliation(s)
- Alberto Carmona-Bayonas
- Department of Hematology and Medical Oncology, Morales Meseguer University Hospital, Calle Marqués de los Vélez, s/n, CP 30008, Murcia, Spain.
| | | | - Ana Custodio
- Department of Medical Oncology, La Paz University Hospital, Madrid, Spain
| | - Enrique Grande
- Department of Medical Oncology, Ramón y Cajal University Hospital, Madrid, Spain
| | - Jaume Capdevila
- Department of Medical Oncology, Vall D'Hebrón University Hospital, Vall D'Hebrón Institute of Oncology (VHIO), Universitat Autònoma de Barcelona, center affiliated with the Red Temática de Investigación Cooperativa en Cáncer (RTICC), Instituto Carlos III, Spanish Ministry of Science and Innovation, Barcelona, Spain
| | - Carlos López
- Department of Medical Oncology, Marqués de Valdecilla University Hospital, Santander, Spain
| | - Alex Teule
- Department of Medical Oncology, Institut Català d'Oncologia, L'Hospitalet de Llobregat, center affiliated with the Red Temática de Investigación Cooperativa en Cáncer (RTICC), Instituto Carlos III, Spanish Ministry of Science and Innovation, Barcelona, Spain
| | - Rocío Garcia-Carbonero
- Department of Medical Oncology, Doce de Octubre University Hospital, center affiliated with the Red Temática de Investigación Cooperativa en Cáncer (RTICC), Instituto Carlos III, Spanish Ministry of Science and Innovation, Madrid, Spain
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Shen Z, Chen X, Li Q, Ye H, Li J, Zhou C, Duan S. TGFB2 and BCL2L11 methylation in male laryngeal cancer patients. Oncol Lett 2016; 12:2999-3003. [PMID: 27698889 DOI: 10.3892/ol.2016.5018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 06/10/2016] [Indexed: 12/23/2022] Open
Abstract
DNA methylation is a major regulatory mechanism of gene expression. The aim of the present study was to test the association of transforming growth factor β2 (TGFB2) and B cell lymphoma 2-like 11 (BCL2L11) gene methylation with the risk of laryngeal squamous cell carcinoma (LSCC). Using bisulfite pyrosequencing technology, DNA methylation levels of TGFB2 promoter and BCL2L11 gene-body CpG cytosines were measured in 90 LSCC tissues and 90 adjacent normal tissues. Analysis of variance and paired sample t-test were used to determine the association of gene methylation and the risk of LSCC. Our results revealed that there were no differences in TGFB2 and BCL2L11 methylation levels between the LSCC tissues and the paired normal tissues (P>0.05). Further breakdown analyses demonstrated that the association results of the two gene methylation levels and LSCC remained unchanged with the age, smoking history, histological differentiation or clinical stage of the LSCC patients (all adjusted P>0.05). In conclusion, there is no association of TGFB2 promoter and BCL2L11 gene-body methylation with the risk of LSCC in males.
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Affiliation(s)
- Zhisen Shen
- Department of Otorhinolaryngology, Lihuili Hospital of Ningbo University, Ningbo, Zhejiang 315040, P.R. China
| | - Xiaoying Chen
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Qun Li
- Department of Otorhinolaryngology, Lihuili Hospital of Ningbo University, Ningbo, Zhejiang 315040, P.R. China; Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Huadan Ye
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Jinyun Li
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Chongchang Zhou
- Department of Otorhinolaryngology, Lihuili Hospital of Ningbo University, Ningbo, Zhejiang 315040, P.R. China; Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Shiwei Duan
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
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Taelman VF, Radojewski P, Marincek N, Ben-Shlomo A, Grotzky A, Olariu CI, Perren A, Stettler C, Krause T, Meier LP, Cescato R, Walter MA. Upregulation of Key Molecules for Targeted Imaging and Therapy. J Nucl Med 2016; 57:1805-1810. [DOI: 10.2967/jnumed.115.165092] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 04/22/2016] [Indexed: 01/25/2023] Open
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Veenstra MJ, van Koetsveld PM, Dogan F, Farrell WE, Feelders RA, Lamberts SWJ, de Herder WW, Vitale G, Hofland LJ. Epidrug-induced upregulation of functional somatostatin type 2 receptors in human pancreatic neuroendocrine tumor cells. Oncotarget 2016; 9:14791-14802. [PMID: 29599907 PMCID: PMC5871078 DOI: 10.18632/oncotarget.9462] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 04/24/2016] [Indexed: 12/13/2022] Open
Abstract
Somatostatin receptors are a pivotal target for treatment of pancreatic neuroendocrine tumors (pNET), either with somatostatin analogues (SSA) or radiolabeled SSA. The highest affinity target for the most commonly used SSA is the somatostatin receptor type 2 (sst2 ). An important factor that may complicate treatment efficacy, is the variable number of receptors expressed on pNETs. Gene expression is subject to complex regulation, in which epigenetics has a central role. In this study we explored the possible role of epigenetic modifications in the variations in sst2 expression levels in two human pNET cell lines, BON-1 and QGP-1. We found upregulation of sst2 mRNA after treatment with the epidrugs 5-aza-2'-deoxycytidine (5-aza-dC) and valproic acid (VPA), an increased uptake of radiolabeled octreotide, as well as increased sensitivity to the SSA octreotide in functional cAMP inhibition. At epigenetic level we observed low methylation levels of the sst2 gene promoter region irrespective of expression. Activating histone mark H3K9Ac can be regulated with epidrug treatment, with an angle of effect corresponding to the effect on mRNA expression. Repressive histone mark H3K27me3 is not regulated by either 5-aza-dC or VPA. We conclude that epidrug treatment, in particular with combined 5-aza-dC and VPA treatment, might hold promise for improving and adding to current SSA treatment strategies of patients with pNETs.
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Affiliation(s)
- Marije J Veenstra
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
| | - Peter M van Koetsveld
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
| | - Fadime Dogan
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
| | - William E Farrell
- Department Human Disease and Genomics Group, Institute of Science and Technology in Medicine, School of Medicine, Keele University, Keele, United Kingdom
| | - Richard A Feelders
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
| | - Steven W J Lamberts
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
| | - Wouter W de Herder
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
| | - Giovanni Vitale
- Laboratory of Endocrine and Metabolic Research, Istituto Auxologico Italiano IRCCS, Milan, Italy.,Department of Clinical Sciences and Community Health (DISCCO), University of Milan, Milan, Italy
| | - Leo J Hofland
- Department of Internal Medicine, Division of Endocrinology, Erasmus MC, Rotterdam, The Netherlands
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Shen Z, Chen X, Li Q, Zhou C, Li J, Ye H, Duan S. SSTR2 promoter hypermethylation is associated with the risk and progression of laryngeal squamous cell carcinoma in males. Diagn Pathol 2016; 11:10. [PMID: 26796520 PMCID: PMC4722764 DOI: 10.1186/s13000-016-0461-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 01/14/2016] [Indexed: 01/08/2023] Open
Abstract
Background Somatostatin receptor 2 (SSTR2) encodes somatostatin receptor that can inhibit the cell proliferation of solid tumors. Promoter hypermethylation is likely to silence the expression of SSTR2. The goal of our study was to investigate the association between SSTR2 promoter methylation and the risk and progression of laryngeal carcinoma. Methods In the current study, tumor tissues and their adjacent non-tumor tissues were collected from a total of 87 laryngeal squamous cell carcinoma (LSCC) male patients. DNA methylation levels of nine SSTR2 promoter CpGs were measured using the bisulphite pyrosequencing technology. Results Our results revealed that there was a significantly increased SSTR2 promoter methylation in LSCC tissues than in their adjacent non-cancerous tissues (adjusted P = 0.003). Breakdown analysis by age indicated that the significant association was mainly contributed by patients younger than 60 (adjusted P = 0.039) but not in patients older than 60. Meanwhile, the significant association was observed in the patients with moderately (adjusted P = 0.037) and well differentiated tissues (adjusted P = 0.028), as well as the patients with histological stage IV (adjusted P = 0.031). Multivariate Cox analysis suggested that SSTR2 promoter methylation was an independent prognostic factor of LSCC (HR = 1.127, 95 % CI = 1.034–1.228). Conclusions In conclusion, SSTR2 promoter hypermethylation might be associated with the risk and progression of LSCC in males.
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Affiliation(s)
- Zhisen Shen
- Department of Otorhinolaryngology (Head and Neck Surgery), Lihuili Hospital of Ningbo University, Ningbo, Zhejiang, 315040, China.
| | - Xiaoying Chen
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China.
| | - Qun Li
- Department of Otorhinolaryngology (Head and Neck Surgery), Lihuili Hospital of Ningbo University, Ningbo, Zhejiang, 315040, China. .,Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China.
| | - Chongchang Zhou
- Department of Otorhinolaryngology (Head and Neck Surgery), Lihuili Hospital of Ningbo University, Ningbo, Zhejiang, 315040, China. .,Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China.
| | - Jinyun Li
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China.
| | - Huadan Ye
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China.
| | - Shiwei Duan
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, Zhejiang, 315211, China.
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Chalabi-Dchar M, Cassant-Sourdy S, Duluc C, Fanjul M, Lulka H, Samain R, Roche C, Breibach F, Delisle MB, Poupot M, Dufresne M, Shimaoka T, Yonehara S, Mathonnet M, Pyronnet S, Bousquet C. Loss of Somatostatin Receptor Subtype 2 Promotes Growth of KRAS-Induced Pancreatic Tumors in Mice by Activating PI3K Signaling and Overexpression of CXCL16. Gastroenterology 2015; 148:1452-65. [PMID: 25683115 DOI: 10.1053/j.gastro.2015.02.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 02/04/2015] [Accepted: 02/06/2015] [Indexed: 12/17/2022]
Abstract
BACKGROUND & AIMS The KRAS gene is mutated in most pancreatic ductal adenocarcinomas (PDAC). Expression of this KRAS oncoprotein in mice is sufficient to initiate carcinogenesis but not progression to cancer. Activation of phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K) is required for KRAS for induction and maintenance of PDAC in mice. The somatostatin receptor subtype 2 (sst2) inhibits PI3K, but sst2 expression is lost during the development of human PDAC. We investigated the effects of sst2 loss during KRAS-induced PDAC development in mice. METHODS We analyzed tumor growth in mice that expressed the oncogenic form of KRAS (KRAS(G12D)) in pancreatic precursor cells, as well as sst2+/- and sst2-/-, and in crossed KRAS(G12D);sst2+/- and KRAS(G12D);sst2-/- mice. Pancreatic tissues and acini were collected and assessed by histologic, immunoblot, immunohistochemical, and reverse-transcription polymerase chain reaction analyses. We also compared protein levels in paraffin-embedded PDAC samples from patients vs heathy pancreatic tissues from individuals without pancreatic cancer. RESULTS In sst2+/- mice, PI3K was activated and signaled via AKT (PKB; protein kinase B); when these mice were crossed with KRAS(G12D) mice, premalignant lesions, tumors, and lymph node metastases developed more rapidly than in KRAS(G12D) mice. In crossed KRAS(G12D);sst2+/- mice, activation of PI3K signaling via AKT resulted in activation of nuclear factor-κB (NF-κB), which increased KRAS activity and its downstream pathways, promoting initiation and progression of neoplastic lesions. We found this activation loop to be mediated by PI3K-induced production of the chemokine CXCL16. Administration of a CXCL16-neutralizing antibody to KRAS(G12D) mice reduced activation of PI3K signaling to AKT and NF-κB, blocking carcinogenesis. Levels of CXCL16 and its receptor CXCR6 were significantly higher in PDAC tissues and surrounding acini than in healthy pancreatic tissues from mice or human beings. In addition, expression of sst2 was progressively lost, involving increased PI3K activity, in mouse lesions that expressed KRAS(G12D) and progressed to PDAC. CONCLUSIONS Based on analyses of mice, loss of sst2 from pancreatic tissues activates PI3K signaling via AKT, leading to activation of NF-κB, amplification of oncogenic KRAS signaling, increased expression of CXCL16, and pancreatic tumor formation. CXCL16 might be a therapeutic target for PDAC.
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Affiliation(s)
- Mounira Chalabi-Dchar
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Stéphanie Cassant-Sourdy
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Camille Duluc
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Marjorie Fanjul
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Hubert Lulka
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Rémi Samain
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Catherine Roche
- UMR7286 CNRS-Aix-Marseille University, Neurobiology and Neurophysiology Research Center of Marseille, and Laboratory of Molecular Biology, AP-HM Conception, Marseille, France
| | | | | | - Mary Poupot
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Marlène Dufresne
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Takeshi Shimaoka
- Department of Molecular Preventive Medicine, Graduate School of Medicine, Tokyo University, Tokyo, Japan
| | - Shin Yonehara
- Laboratory of Molecular and Cellular Biology, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Muriel Mathonnet
- EA 3842 Laboratory, Medicine and Pharmacy Faculties, Limoges University, Limoges, France
| | - Stéphane Pyronnet
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France
| | - Corinne Bousquet
- INSERM UMR-1037, Toulouse University, Cancer Research Center of Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Toulouse, France.
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Tiscornia MM, González HS, Lorenzati MA, Zapata PD. Association Between Methylation of SHP-1 Isoform I and SSTR2A Promoter Regions with Breast and Prostate Carcinoma Development. Cancer Invest 2015; 33:61-9. [DOI: 10.3109/07357907.2014.1001892] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Hennigs JK, Müller J, Adam M, Spin JM, Riedel E, Graefen M, Bokemeyer C, Sauter G, Huland H, Schlomm T, Minner S. Loss of somatostatin receptor subtype 2 in prostate cancer is linked to an aggressive cancer phenotype, high tumor cell proliferation and predicts early metastatic and biochemical relapse. PLoS One 2014; 9:e100469. [PMID: 25010045 PMCID: PMC4091868 DOI: 10.1371/journal.pone.0100469] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Accepted: 05/26/2014] [Indexed: 01/03/2023] Open
Abstract
Somatostatin receptor subtype 2 (SSTR2) is the most frequently expressed SSTR subtype in normal human tissues. SSTR2 expression is differentially regulated in various tumor types and therapeutic somatostatin analogs binding to SSTR2 are in clinical use. In prostate cancers highly contradictory results in terms of SSTR2 expression and its consequences have been published over the past years. The aim of this study was to clarify prevalence and clinical significance of SSTR2 expression in prostate cancer. Therefore, quantitative immunohistochemistry (IHC) using a tissue microarray containing samples from 3,261 prostate cancer patients with extensive clinical and molecular cancer characteristics and oncological follow-up data was performed. IHC data was compared to publicly available Gene Expression Omnibus datasets of human prostate cancer gene expression arrays. While membranous SSTR2 staining was always seen in normal prostate epithelium, SSTR2 staining was absent in more than half (56.1%) of 2,195 interpretable prostate cancer samples. About 13% of all analyzed prostate cancers showed moderate to strong cytoplasmic and membranous SSTR2 staining. Staining intensities were inversely correlated with high Gleason grade, advanced pT category, high tumor cell proliferation (p<0.0001 each), high pre-operative PSA levels, (p = 0.0011) and positive surgical margins (p = 0.006). In silico analysis confirmed lower SSTR2 gene expression in prostate cancers vs. normal adjacent tissue (p = 0.0424), prostate cancer metastases vs. primary cancers (p = 0.0011) and recurrent vs. non-recurrent prostate cancers (p = 0.0438). PSA-free survival gradually declined with SSTR2 staining intensity (p<0.0001). SSTR2-negative cancers were more likely to develop metastases over time (p<0.05). In conclusion, most prostate cancers are indeed SSTR2-negative and loss of SSTR2 strongly predicts an unfavorable tumor phenotype and poor prognosis. Therefore, SSTR2 expression seems an important factor in the pathogenesis of prostate cancer and re-introduction of the receptor in SSTR2-negative prostate cancers may feature a promising target for novel gene therapy approaches.
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Affiliation(s)
- Jan K. Hennigs
- Department of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Department of Internal Medicine II - Oncology, Hematology, BMT with Section Pneumology, Hubertus-Wald-Tumorzentrum/University Cancer Center Hamburg (UCCH) University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- * E-mail:
| | - Julia Müller
- Department of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Matti Adam
- Division of Cardiovascular Medicine and Cardiovascular Institute, Stanford University – School of Medicine, Stanford, California, United States of America
| | - Joshua M. Spin
- Division of Cardiovascular Medicine and Cardiovascular Institute, Stanford University – School of Medicine, Stanford, California, United States of America
| | - Emilia Riedel
- Department of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Markus Graefen
- Martini Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Carsten Bokemeyer
- Department of Internal Medicine II - Oncology, Hematology, BMT with Section Pneumology, Hubertus-Wald-Tumorzentrum/University Cancer Center Hamburg (UCCH) University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Guido Sauter
- Department of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Hartwig Huland
- Martini Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Thorsten Schlomm
- Martini Clinic, Prostate Cancer Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sarah Minner
- Department of Pathology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Shi X, Li X, Chen L, Wang C. Analysis of somatostatin receptors and somatostatin promoter methylation in human gastric cancer. Oncol Lett 2013; 6:1794-1798. [PMID: 24260078 PMCID: PMC3834542 DOI: 10.3892/ol.2013.1614] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 10/02/2013] [Indexed: 02/05/2023] Open
Abstract
Somatostatin (SST) is a gut peptide that is able to inhibit the growth of tumor cells in gastric cancer and other types of cancer. The present study investigated the mRNA and protein levels of SST and SST receptors (SSTRs) in human gastric cancer, and detected the DNA methylation of the SST promoter. The protein levels of SST were detected using a radioimmunoassay in 102 human gastric tissue specimens (51 pairs of samples from 51 gastric cancer patients, each pair of samples included a cancer tissue and a normal tissue sample). SST and SSTR mRNA expression was assessed by reverse transcription-PCR (RT-PCR), while SST promoter methylation was examined using quantitative methylation-specific PCR (qMSP) in 51 pairs of tissues. The association between SST protein and RNA levels and SST methylation and gastric cancer were also analyzed. The protein levels of SST were decreased in the gastric cancer group compared with those of the normal group (5.091±0.994 vs. 7.399±0.956 pg/mg; P<0.01). The RT-PCR analysis indicated that the mRNA levels of SST (0.218±0.183 vs. 0.456±0.331; P<0.001) and SSTRs in the gastric cancer group were lower compared with those of the normal gastric tissue group. The methylation proportion of SST was 45.1% (23/51) in the carcinoma group and 3.9% (2/51) in the normal group. In conclusion, SST promoter methylation is a common event in human gastric cancer and is connected with a decrease in SST protein and RNA levels and associated with gastric carcinogens.
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Affiliation(s)
- Xuefei Shi
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
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Veenstra MJ, de Herder WW, Feelders RA, Hofland LJ. Targeting the somatostatin receptor in pituitary and neuroendocrine tumors. Expert Opin Ther Targets 2013; 17:1329-43. [DOI: 10.1517/14728222.2013.830711] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Rubio A, Sánchez-Mut JV, García E, Velasquez ZD, Oliver J, Esteller M, Avila J. Epigenetic control of somatostatin and cortistatin expression by β amyloid peptide. J Neurosci Res 2011; 90:13-20. [PMID: 21922516 DOI: 10.1002/jnr.22731] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Revised: 05/26/2011] [Accepted: 06/02/2011] [Indexed: 01/06/2023]
Abstract
β Amyloid, present in senile plaques, has been related largely to neuronal loss in the brain of patients with Alzheimer's disease. However, how neurons respond to β amyloid insults is still poorly understood. Here we show that β amyloid increases somatostatin and cortistatin gene expression mainly through an increase in histone 3 lysine 4 methylation (H3K4me3), a modification associated with transcriptional activation. Somatostatin and cortistatin partially decreased β amyloid toxicity in primary cortical neurons in culture. Thus we suggest that neurons respond to β amyloid insults by releasing somatostatin and cortistatin, which will act as a protective agent against β amyloid toxicity. Our results suggest a relevant function for both neuropeptides against β amyloid toxicity, providing new insights into Alzheimer's disease.
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Affiliation(s)
- Alicia Rubio
- Centro de Biología Molecular Severo Ochoa (CSIC-UAM), C/Nicolás Cabrera 1, Universidad Autónoma de Madrid, Campus Cantoblanco, Madrid, Spain
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Thrombospondin-1 is a critical effector of oncosuppressive activity of sst2 somatostatin receptor on pancreatic cancer. Proc Natl Acad Sci U S A 2009; 106:17769-74. [PMID: 19805200 DOI: 10.1073/pnas.0908674106] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The somatostatin receptor subtype 2 (sst2) behaves as a tumor suppressor when expressed and stimulated by its ligand somatostatin in pancreatic cancer. We reveal a mechanism underlying oncosuppressive action of sst2, whereby this inhibitory receptor upregulates the expression of the secreted angioinhibitory factor thrombospondin-1 (TSP-1), as demonstrated in exocrine BxPC-3 and endocrine BON pancreatic cancer cells. The sst2-dependent upregulation of TSP-1 occurs through the inhibition of the PI3K pathway. It depends on transcriptional and translational events, involving a previously undescribed IRES in the 5'-UTR of TSP-1 mRNA. Chick chorioallantoic membrane was used as an in vivo model to demonstrate that TSP-1 is a critical effector of the inhibitory role of sst2 on the neoangiogenesis and oncogenesis induced by pancreatic cancer cells. TSP-1 reduced in vitro tubulogenesis of endothelial cells when grown in conditioned medium from pancreatic cancer cells expressing sst2, as compared to those expressing the control vector. TSP-1 inhibited tumor cell-induced neoangiogenesis by directly sequestering the proangiogenic factor VEGF, and inactivating the angiogenesis initiated by VEGFR2 phosphorylation in endothelial cells. Using human pancreatic tissue-microarrays, the expression of both sst2 and TSP-1 was shown to be correlated during the pancreatic neoplastic program. Both proteins are nearly undetectable in normal exocrine pancreas and in most invasive cancer lesions, but their expression is strikingly upregulated in most preinvasive cancer-adjacent lesions. The upregulation of both sst2 and TSP-1 tumor suppressors may function as an early negative feedback to restrain pancreatic carcinogenesis.
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Abstract
Excessive weight gain arises from the interactions among environmental factors, genetic predisposition and the individual behavior. However, it is becoming evident that interindividual differences in obesity susceptibility depend also on epigenetic factors. Epigenetics studies the heritable changes in gene expression that do not involve changes to the underlying DNA sequence. These processes include DNA methylation, covalent histone modifications, chromatin folding and, more recently described, the regulatory action of miRNAs and polycomb group complexes. In this review, we focus on experimental evidences concerning dietary factors influencing obesity development by epigenetic mechanisms, reporting treatment doses and durations. Moreover, we present a bioinformatic analysis of promoter regions for the search of future epigenetic biomarkers of obesity, including methylation pattern analyses of several obesity-related genes (epiobesigenes), such as FGF2, PTEN, CDKN1A and ESR1, implicated in adipogenesis, SOCS1/SOCS3, in inflammation, and COX7A1 LPL, CAV1, and IGFBP3, in intermediate metabolism and insulin signalling. The identification of those individuals that at an early age could present changes in the methylation profiles of specific genes could help to predict their susceptibility to later develop obesity, which may allow to prevent and follow-up its progress, as well as to research and develop newer therapeutic approaches.
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Affiliation(s)
- J Campión
- Department of Food Sciences, Physiology and Toxicology, University of Navarra, Pamplona, Spain
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Sutton BS, Palmer ND, Langefeld CD, Xue B, Proctor A, Ziegler JT, Haffner SM, Norris JM, Bowden DW. Association of SSTR2 polymorphisms and glucose homeostasis phenotypes: the Insulin Resistance Atherosclerosis Family Study. Diabetes 2009; 58:1457-62. [PMID: 19324939 PMCID: PMC2682669 DOI: 10.2337/db08-0189] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE This study evaluated the influence of somatostatin receptor type 2 (SSTR2) polymorphisms on measures of glucose homeostasis in the Insulin Resistance Atherosclerosis Family Study (IRASFS). SSTR2 is a G-protein-coupled receptor that, in response to somatostatin, mediates inhibition of insulin, glucagon, and growth hormone release and thus may affect glucose homeostasis. RESEARCH DESIGN AND METHODS Ten single nucleotide polymorphisms (SNPs) spanning the gene were chosen using a SNP density selection algorithm and genotyped on 1,425 Hispanic-American individuals from 90 families in the IRASFS. These families comprised two samples (set 1 and set 2), which were analyzed individually and as a combined set. Single SNP tests of association were performed for four glucose homeostasis measures--insulin sensitivity (S(I)), acute insulin response (AIR), disposition index (DI), and fasting blood glucose (FBG)--using generalized estimating equations. RESULTS The SSTR2 locus was encompassed by a single linkage disequilibrium (LD) block (D' = 0.91-1.00; r(2) = 0.09-0.97) that contained four of the ten SNPs evaluated. Within the SSTR2-containing LD block, evidence of association was observed in each of the two sets and in a combined analysis with decreased S(I)(beta(homozygous) = -0.16; P(meta-analysis) = 0.0024-0.0030), decreased DI (beta(homozygous) = -0.35 to -5.16; P(meta-analysis) = 0.0075-0.027), and increased FBG (beta(homozygous) = 2.30; P(meta-analysis) = 0.045). SNPs outside the SSTR2-containing LD block were not associated with measures of glucose homeostasis. CONCLUSIONS We observed evidence for association of SSTR2 polymorphisms with measures of glucose homeostasis. Thus, variants in SSTR2 may influence pathways of S(I)to modulate glucose homeostasis.
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Affiliation(s)
- Beth S. Sutton
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Center for Human Genomics, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - Nicholette D. Palmer
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Center for Human Genomics, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - Carl D. Langefeld
- Department of Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - Bingzhong Xue
- Center for Human Genomics, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - Alexandria Proctor
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Center for Human Genomics, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - Julie T. Ziegler
- Department of Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina
| | - Steven M. Haffner
- Department of Medicine, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
| | - Jill M. Norris
- Department of Preventive Medicine and Biometrics, University of Colorado Denver, Denver, Colorado
| | - Donald W. Bowden
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Center for Human Genomics, Wake Forest University School of Medicine, Winston-Salem, North Carolina
- Department of Internal Medicine, University of Texas Health Sciences Center at San Antonio, San Antonio, Texas
- Corresponding author: Donald W. Bowden,
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