1
|
de Nonneville A, Kalbacher E, Cannone F, Guille A, Adelaïde J, Finetti P, Cappiello M, Lambaudie E, Ettore G, Charafe E, Mamessier E, Provansal M, Bertucci F, Sabatier R. Endometrioid ovarian carcinoma landscape: pathological and molecular characterization. Mol Oncol 2024. [PMID: 38923749 DOI: 10.1002/1878-0261.13679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2024] [Accepted: 05/28/2024] [Indexed: 06/28/2024] Open
Abstract
Endometrioid ovarian cancers (EOvC) are usually managed as serous tumors. In this study, we conducted a comprehensive molecular investigation to uncover the distinct biological characteristics of EOvC. This retrospective multicenter study involved patients from three European centers. We collected clinical data and formalin-fixed paraffin-embedded (FFPE) samples for analysis at the DNA level using panel-based next-generation sequencing and array-comparative genomic hybridization. Additionally, we examined mRNA expression using NanoString nCounter® and protein expression through tissue microarray. We compared EOvC with other ovarian subtypes and uterine endometrioid tumors. Furthermore, we assessed the impact of molecular alterations on patient outcomes, including progression-free survival (PFS) and overall survival (OS). Preliminary analysis of clinical data from 668 patients, including 86 (12.9%) EOvC, revealed more favorable prognosis for EOvC compared with serous ovarian carcinoma (5-year OS of 60% versus 45%; P = 0.001) driven by diagnosis at an earlier stage. Immunohistochemistry and copy number alteration (CNA) profiles of 43 cases with clinical data and FFPE samples available indicated that EOvC protein expression and CNA profiles were more similar to endometrioid endometrial tumors than to serous ovarian carcinomas. EOvC exhibited specific alterations, such as lower rates of PTEN loss, mutations in DNA repair genes, and P53 abnormalities. Survival analysis showed that patients with tumors harboring loss of PTEN expression had worse outcomes (median PFS 19.6 months vs. not reached; P = 0.034). Gene expression profile analysis confirmed that EOvC differed from serous tumors. However, comparison to other rare subtypes of ovarian cancer suggested that the EOvC transcriptomic profile was close to that of ovarian clear cell carcinoma. Downregulation of genes involved in the PI3K pathway and DNA methylation was observed in EOvC. In conclusion, EOvC represents a distinct biological entity and should be regarded as such in the development of specific clinical approaches.
Collapse
Affiliation(s)
- Alexandre de Nonneville
- Department of Medical Oncology, Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, Marseille, France
- Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, CRCM-Predictive Oncology Laboratory, Marseille, France
| | - Elsa Kalbacher
- Department of Medical Oncology, CHRU Jean Minjoz, Besançon, France
| | - Francesco Cannone
- Department of Obstetrics and Gynecology, ARNAS Garibaldi, Catania, Italy
| | - Arnaud Guille
- Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, CRCM-Predictive Oncology Laboratory, Marseille, France
| | - José Adelaïde
- Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, CRCM-Predictive Oncology Laboratory, Marseille, France
| | - Pascal Finetti
- Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, CRCM-Predictive Oncology Laboratory, Marseille, France
| | - Maria Cappiello
- Department of Medical Oncology, Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, Marseille, France
| | - Eric Lambaudie
- Department of Surgical Oncology, Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, Marseille, France
| | - Giuseppe Ettore
- Department of Obstetrics and Gynecology, ARNAS Garibaldi, Catania, Italy
| | - Emmanuelle Charafe
- Department of Biopathology, Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, ICEP platform, CRCM, Marseille, France
| | - Emilie Mamessier
- Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, CRCM-Predictive Oncology Laboratory, Marseille, France
| | - Magali Provansal
- Department of Medical Oncology, Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, Marseille, France
| | - François Bertucci
- Department of Medical Oncology, Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, Marseille, France
- Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, CRCM-Predictive Oncology Laboratory, Marseille, France
| | - Renaud Sabatier
- Department of Medical Oncology, Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, Marseille, France
- Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, CRCM-Predictive Oncology Laboratory, Marseille, France
- ARCAGY-GINECO, GINEGEPS Group, Paris, France
| |
Collapse
|
2
|
Waitkus MS, Erman EN, Reitman ZJ, Ashley DM. Mechanisms of telomere maintenance and associated therapeutic vulnerabilities in malignant gliomas. Neuro Oncol 2024; 26:1012-1024. [PMID: 38285162 PMCID: PMC11145458 DOI: 10.1093/neuonc/noae016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Indexed: 01/30/2024] Open
Abstract
A majority of cancers (~85%) activate the enzyme telomerase to maintain telomere length over multiple rounds of cellular division. Telomerase-negative cancers activate a distinct, telomerase-independent mechanism of telomere maintenance termed alternative lengthening of telomeres (ALT). ALT uses homologous recombination to maintain telomere length and exhibits features of break-induced DNA replication. In malignant gliomas, the activation of either telomerase or ALT is nearly ubiquitous in pediatric and adult tumors, and the frequency with which these distinct telomere maintenance mechanisms (TMMs) is activated varies according to genetically defined glioma subtypes. In this review, we summarize the current state of the field of TMMs and their relevance to glioma biology and therapy. We review the genetic alterations and molecular mechanisms leading to telomerase activation or ALT induction in pediatric and adult gliomas. With this background, we review emerging evidence on strategies for targeting TMMs for glioma therapy. Finally, we comment on critical gaps and issues for moving the field forward to translate our improved understanding of glioma telomere maintenance into better therapeutic strategies for patients.
Collapse
Affiliation(s)
- Matthew S Waitkus
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Elise N Erman
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Zachary J Reitman
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina, USA
| | - David M Ashley
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| |
Collapse
|
3
|
Yuan Y, Cao D, Zhang A, Liu Z, Deng Z, Zhang S. Targeted PLK1 suppression through RNA interference mediated by high-fidelity Cas13d mitigates osteosarcoma progression via TGF-β/Smad3 signalling. J Cell Mol Med 2024; 28:e18400. [PMID: 38780513 PMCID: PMC11114212 DOI: 10.1111/jcmm.18400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 04/01/2024] [Accepted: 04/30/2024] [Indexed: 05/25/2024] Open
Abstract
Osteosarcoma is the most common primary bone malignancy in children and adolescents. Overexpression of polo-like kinase 1 (PLK1) is frequent in osteosarcoma and drives disease progression and metastasis, making it a promising therapeutic target. In this study, we explored PLK1 knockdown in osteosarcoma cells using RNA interference mediated by high-fidelity Cas13d (hfCas13d). PLK1 was found to be significantly upregulated in osteosarcoma tumour tissues compared to normal bone. sgRNA-mediated PLK1 suppression via hfCas13d transfection inhibited osteosarcoma cell proliferation, induced G2/M cell cycle arrest, promoted apoptosis, reduced cell invasion and increased expression of the epithelial marker E-cadherin. Proximity labelling by TurboID coupled with co-immunoprecipitation identified novel PLK1 interactions with Smad3, a key intracellular transducer of TGF-β signalling. PLK1 knockdown impaired Smad2/3 phosphorylation and modulated TGF-β/Smad3 pathway inactivation. Finally, in vivo delivery of hfCas13d vectors targeting PLK1 substantially attenuated osteosarcoma xenograft growth in nude mice. Taken together, this study highlights PLK1 as a potential therapeutic target and driver of disease progression in osteosarcoma. It also demonstrates the utility of hfCas13d-mediated gene knockdown as a strategy for targeted therapy. Further optimization of PLK1 suppression approaches may ultimately improve clinical outcomes for osteosarcoma patients.
Collapse
Affiliation(s)
- Yi Yuan
- Department of OrthopedicsChongqing General HospitalChongqingChina
- Department of Orthopedics, The Second Affiliated HospitalChongqing Medical UniversityChongqingChina
- Department of OrthopedicsDazhou Second People's Hospital of Sichuan ProvinceDazhouChina
| | - Daigui Cao
- Department of OrthopedicsChongqing General HospitalChongqingChina
| | - Anwei Zhang
- Department of OrthopedicsChongqing General HospitalChongqingChina
- Department of Orthopedics, The Second Affiliated HospitalChongqing Medical UniversityChongqingChina
| | - Zhiwei Liu
- Department of OrthopedicsChongqing General HospitalChongqingChina
| | - Zhongliang Deng
- Department of Orthopedics, The Second Affiliated HospitalChongqing Medical UniversityChongqingChina
| | - Shengli Zhang
- Department of OrthopedicsChongqing General HospitalChongqingChina
| |
Collapse
|
4
|
Tan K, Tse-Dinh YC. Variation of Structure and Cellular Functions of Type IA Topoisomerases across the Tree of Life. Cells 2024; 13:553. [PMID: 38534397 DOI: 10.3390/cells13060553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 03/12/2024] [Accepted: 03/19/2024] [Indexed: 03/28/2024] Open
Abstract
Topoisomerases regulate the topological state of cellular genomes to prevent impediments to vital cellular processes, including replication and transcription from suboptimal supercoiling of double-stranded DNA, and to untangle topological barriers generated as replication or recombination intermediates. The subfamily of type IA topoisomerases are the only topoisomerases that can alter the interlinking of both DNA and RNA. In this article, we provide a review of the mechanisms by which four highly conserved N-terminal protein domains fold into a toroidal structure, enabling cleavage and religation of a single strand of DNA or RNA. We also explore how these conserved domains can be combined with numerous non-conserved protein sequences located in the C-terminal domains to form a diverse range of type IA topoisomerases in Archaea, Bacteria, and Eukarya. There is at least one type IA topoisomerase present in nearly every free-living organism. The variation in C-terminal domain sequences and interacting partners such as helicases enable type IA topoisomerases to conduct important cellular functions that require the passage of nucleic acids through the break of a single-strand DNA or RNA that is held by the conserved N-terminal toroidal domains. In addition, this review will exam a range of human genetic disorders that have been linked to the malfunction of type IA topoisomerase.
Collapse
Affiliation(s)
- Kemin Tan
- Structural Biology Center, X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL 60439, USA
| | - Yuk-Ching Tse-Dinh
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA
- Biomolecular Sciences Institute, Florida International University, Miami, FL 33199, USA
| |
Collapse
|
5
|
Azzalin CM. TERRA and the alternative lengthening of telomeres: a dangerous affair. FEBS Lett 2024. [PMID: 38445359 DOI: 10.1002/1873-3468.14844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 02/14/2024] [Accepted: 02/20/2024] [Indexed: 03/07/2024]
Abstract
Eukaryotic telomeres are transcribed into the long noncoding RNA TERRA. A fraction of TERRA remains associated with telomeres by forming RNA:DNA hybrids dubbed telR-loops. TERRA and telR-loops are essential to promote telomere elongation in human cancer cells that maintain telomeres through a homology-directed repair pathway known as alternative lengthening of telomeres or ALT. However, TERRA and telR-loops compromise telomere integrity and cell viability if their levels are not finely tuned. The study of telomere transcription in ALT cells will enormously expand our understanding of the ALT mechanism and of how genome integrity is maintained. Moreover, telomere transcription, TERRA and telR-loops are likely to become exceptionally suited targets for the development of novel anti-cancer therapies.
Collapse
Affiliation(s)
- Claus M Azzalin
- Instituto de Medicina Molecular João Lobo Antunes (iMM), Faculdade de Medicina da Universidade de Lisboa, Portugal
| |
Collapse
|
6
|
Luo Y, Sun M, Tan L, Li T, Min L. Nano-Based Drug Delivery Systems: Potential Developments in the Therapy of Metastatic Osteosarcoma-A Narrative Review. Pharmaceutics 2023; 15:2717. [PMID: 38140058 PMCID: PMC10747574 DOI: 10.3390/pharmaceutics15122717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 11/22/2023] [Accepted: 11/29/2023] [Indexed: 12/24/2023] Open
Abstract
Osteosarcoma, a predominant malignant bone tumor, poses significant challenges due to its high metastatic and recurrent nature. Although various therapeutic strategies are currently in use, they often inadequately target osteosarcoma metastasis. This review focuses on the potential of nanoscale drug delivery systems to bridge this clinical gap. It begins with an overview of the molecular mechanisms underlying metastatic osteosarcoma, highlighting the limitations of existing treatments. The review then transitions to an in-depth examination of nanoscale drug delivery technologies, emphasizing their potential to enhance drug bioavailability and reduce systemic toxicity. Central to this review is a discussion of recent advancements in utilizing nanotechnology for the potential intervention of metastatic osteosarcoma, with a critical analysis of several preclinical studies. This review aims to provide insights into the potential applications of nanotechnology in metastatic osteosarcoma therapy, setting the stage for future clinical breakthroughs and innovative cancer treatments.
Collapse
Affiliation(s)
- Yuanrui Luo
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu 610064, China; (Y.L.); (M.S.); (L.T.)
| | - Minghao Sun
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu 610064, China; (Y.L.); (M.S.); (L.T.)
- Department of Model Worker and Innovative Craftsman, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Linyun Tan
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu 610064, China; (Y.L.); (M.S.); (L.T.)
- Department of Model Worker and Innovative Craftsman, West China Hospital, Sichuan University, Chengdu 610064, China
| | - Tao Li
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu 610064, China; (Y.L.); (M.S.); (L.T.)
| | - Li Min
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu 610064, China; (Y.L.); (M.S.); (L.T.)
- Department of Model Worker and Innovative Craftsman, West China Hospital, Sichuan University, Chengdu 610064, China
| |
Collapse
|
7
|
Salomoni P, Flanagan AM, Cottone L. (B)On(e)-cohistones and the epigenetic alterations at the root of bone cancer. Cell Death Differ 2023:10.1038/s41418-023-01227-9. [PMID: 37828086 DOI: 10.1038/s41418-023-01227-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 09/20/2023] [Accepted: 09/27/2023] [Indexed: 10/14/2023] Open
Abstract
Identification of mutations in histones in a number of human neoplasms and developmental syndromes represents the most compelling evidence to date for a causal role of epigenetic perturbations in human disease. In most cases, these mutations have gain of function properties that cause deviation from normal developmental processes leading to embryo defects and/or neoplastic transformation. These exciting discoveries represent a step-change in our understanding of the role of chromatin (dys)regulation in development and disease. However, the mechanisms of action of oncogenic histone mutations (oncohistones) remain only partially understood. Here, we critically assess existing literature on oncohistones focussing mainly on bone neoplasms. We show how it is possible to draw parallels with some of the cell-autonomous mechanisms of action described in paediatric brain cancer, although the functions of oncohistones in bone tumours remain under-investigated. In this respect, it is becoming clear that histone mutations targeting the same residues display, at least in part, tissue-specific oncogenic mechanisms. Furthermore, it is emerging that cancer cells carrying oncohistones can modify the surrounding microenvironment to support growth and/or alter differentiation trajectories. A better understanding of oncohistone function in different neoplasms provide potential for identification of signalling that could be targeted therapeutically. Finally, we discuss some of the main concepts and future directions in this research area, while also drawing possible connections and parallels with other cancer epigenetic mechanisms.
Collapse
Affiliation(s)
- Paolo Salomoni
- Nuclear Function Group, German Center for Neurodegenerative Diseases (DZNE), 53127, Bonn, Germany.
| | - Adrienne M Flanagan
- Department of Histopathology, Royal National Orthopaedic Hospital, Stanmore, Middlesex, HA7 4LP, UK
- Department of Pathology, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
| | - Lucia Cottone
- Department of Pathology, UCL Cancer Institute, University College London, London, WC1E 6BT, UK.
| |
Collapse
|
8
|
Sokač M, Kjær A, Dyrskjøt L, Haibe-Kains B, JWL Aerts H, Birkbak NJ. Spatial transformation of multi-omics data unlocks novel insights into cancer biology. eLife 2023; 12:RP87133. [PMID: 37669321 PMCID: PMC10479962 DOI: 10.7554/elife.87133] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023] Open
Abstract
The application of next-generation sequencing (NGS) has transformed cancer research. As costs have decreased, NGS has increasingly been applied to generate multiple layers of molecular data from the same samples, covering genomics, transcriptomics, and methylomics. Integrating these types of multi-omics data in a combined analysis is now becoming a common issue with no obvious solution, often handled on an ad hoc basis, with multi-omics data arriving in a tabular format and analyzed using computationally intensive statistical methods. These methods particularly ignore the spatial orientation of the genome and often apply stringent p-value corrections that likely result in the loss of true positive associations. Here, we present GENIUS (GEnome traNsformatIon and spatial representation of mUltiomicS data), a framework for integrating multi-omics data using deep learning models developed for advanced image analysis. The GENIUS framework is able to transform multi-omics data into images with genes displayed as spatially connected pixels and successfully extract relevant information with respect to the desired output. We demonstrate the utility of GENIUS by applying the framework to multi-omics datasets from the Cancer Genome Atlas. Our results are focused on predicting the development of metastatic cancer from primary tumors, and demonstrate how through model inference, we are able to extract the genes which are driving the model prediction and are likely associated with metastatic disease progression. We anticipate our framework to be a starting point and strong proof of concept for multi-omics data transformation and analysis without the need for statistical correction.
Collapse
Affiliation(s)
- Mateo Sokač
- Department of Molecular Medicine, Aarhus University HospitalAarhusDenmark
- Department of Clinical Medicine, Aarhus UniversityAarhusDenmark
- Bioinformatics Research Center, Aarhus UniversityAarhusDenmark
| | - Asbjørn Kjær
- Department of Molecular Medicine, Aarhus University HospitalAarhusDenmark
- Department of Clinical Medicine, Aarhus UniversityAarhusDenmark
- Bioinformatics Research Center, Aarhus UniversityAarhusDenmark
| | - Lars Dyrskjøt
- Department of Molecular Medicine, Aarhus University HospitalAarhusDenmark
- Department of Clinical Medicine, Aarhus UniversityAarhusDenmark
| | - Benjamin Haibe-Kains
- Princess Margaret Cancer Centre, University Health Network, Temerty Faculty of Medicine, University of TorontoTorontoCanada
| | - Hugo JWL Aerts
- Artificial Intelligence in Medicine (AIM) Program, Mass General Brigham, Harvard Medical SchoolBostonUnited States
- Departments of Radiation Oncology and Radiology, Brigham and Women’s Hospital, Dana-Farber Cancer Institute, Harvard Medical SchoolBostonUnited States
- Radiology and Nuclear Medicine, CARIM & GROW, Maastricht UniversityMaastrichtNetherlands
| | - Nicolai J Birkbak
- Department of Molecular Medicine, Aarhus University HospitalAarhusDenmark
- Department of Clinical Medicine, Aarhus UniversityAarhusDenmark
- Bioinformatics Research Center, Aarhus UniversityAarhusDenmark
| |
Collapse
|
9
|
Liu H, Xu C, Diplas BH, Brown A, Strickland LM, Yao H, Ling J, McLendon RE, Keir ST, Ashley DM, He Y, Waitkus MS. Cancer-associated SMARCAL1 loss-of-function mutations promote alternative lengthening of telomeres and tumorigenesis in telomerase-negative glioblastoma cells. Neuro Oncol 2023; 25:1563-1575. [PMID: 36689342 PMCID: PMC10484176 DOI: 10.1093/neuonc/noad022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND Telomere maintenance mechanisms are required to enable the replicative immortality of malignant cells. While most cancers activate the enzyme telomerase, a subset of cancers uses telomerase-independent mechanisms termed alternative lengthening of telomeres (ALT). ALT occurs via homology-directed-repair mechanisms and is frequently associated with ATRX mutations. We previously showed that a subset of adult glioblastoma (GBM) patients with ATRX-expressing ALT-positive tumors harbored loss-of-function mutations in the SMARCAL1 gene, which encodes an annealing helicase involved in replication fork remodeling and the resolution of replication stress. However, the causative relationship between SMARCAL1 deficiency, tumorigenesis, and de novo telomere synthesis is not understood. METHODS We used a patient-derived ALT-positive GBM cell line with native SMARCAL1 deficiency to investigate the role of SMARCAL1 in ALT-mediated de novo telomere synthesis, replication stress, and gliomagenesis in vivo. RESULTS Inducible rescue of SMARCAL1 expression suppresses ALT indicators and inhibits de novo telomere synthesis in GBM and osteosarcoma cells, suggesting that SMARCAL1 deficiency plays a functional role in ALT induction in cancers that natively lack SMARCAL1 function. SMARCAL1-deficient ALT-positive cells can be serially propagated in vivo in the absence of detectable telomerase activity, demonstrating that the SMARCAL1-deficient ALT phenotype maintains telomeres in a manner that promotes tumorigenesis. CONCLUSIONS SMARCAL1 deficiency is permissive to ALT and promotes gliomagenesis. Inducible rescue of SMARCAL1 in ALT-positive cell lines permits the dynamic modulation of ALT activity, which will be valuable for future studies aimed at understanding the mechanisms of ALT and identifying novel anticancer therapeutics that target the ALT phenotype.
Collapse
Affiliation(s)
- Heng Liu
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Pathology, Duke University Medical Center, Durham, North Carolina, USA
| | - Cheng Xu
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Pathology, Duke University Medical Center, Durham, North Carolina, USA
| | - Bill H Diplas
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Pathology, Duke University Medical Center, Durham, North Carolina, USA
| | - Alexandrea Brown
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Laura M Strickland
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Haipei Yao
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Pathology, Duke University Medical Center, Durham, North Carolina, USA
| | - Jinjie Ling
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Pathology, Duke University Medical Center, Durham, North Carolina, USA
| | - Roger E McLendon
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Pathology, Duke University Medical Center, Durham, North Carolina, USA
| | - Stephen T Keir
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - David M Ashley
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| | - Yiping He
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Pathology, Duke University Medical Center, Durham, North Carolina, USA
| | - Matthew S Waitkus
- The Preston Robert Tisch Brain Tumor Center, Duke University Medical Center, Durham, North Carolina, USA
- Department of Neurosurgery, Duke University Medical Center, Durham, North Carolina, USA
| |
Collapse
|
10
|
Becher OJ. A new path to alternative lengthening of telomeres? Neuro Oncol 2023; 25:1343-1344. [PMID: 36883676 PMCID: PMC10326486 DOI: 10.1093/neuonc/noad054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Indexed: 03/09/2023] Open
Affiliation(s)
- Oren J Becher
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, New York, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York, USA
- Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| |
Collapse
|
11
|
Carson LM, Flynn RL. Highlighting vulnerabilities in the alternative lengthening of telomeres pathway. Curr Opin Pharmacol 2023; 70:102380. [PMID: 37149932 PMCID: PMC10247456 DOI: 10.1016/j.coph.2023.102380] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 02/03/2023] [Accepted: 03/28/2023] [Indexed: 05/09/2023]
Abstract
The alternative lengthening of telomeres (ALT) pathway is a telomere elongation mechanism found in a small but often aggressive subset of cancers. Dependent on break-induced replication, telomere extension in ALT-positive cells relies on a baseline level of DNA replication stress to initiate elongation events. This results in an elevated level of DNA damage and presents a possible vulnerability to be exploited in the development of ALT-targeted cancer therapies. Currently, there are no treatment options that target the ALT mechanism or that are specific for ALT-positive tumors. Here, we review recent developments and promising directions in the development of ALT-targeted therapeutics, many of which involve tipping the balance towards inhibition or exacerbation of ALT activity to selectively target these cells.
Collapse
Affiliation(s)
- Lisa M Carson
- Departments of Pharmacology and Experimental Therapeutics, and Medicine, Cancer Center, Boston University School of Medicine, Boston, MA, 02118, USA
| | - Rachel L Flynn
- Departments of Pharmacology and Experimental Therapeutics, and Medicine, Cancer Center, Boston University School of Medicine, Boston, MA, 02118, USA.
| |
Collapse
|
12
|
Aguilera P, López-Contreras AJ. ATRX, a guardian of chromatin. Trends Genet 2023; 39:505-519. [PMID: 36894374 DOI: 10.1016/j.tig.2023.02.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 02/07/2023] [Accepted: 02/14/2023] [Indexed: 03/09/2023]
Abstract
ATRX (alpha-thalassemia mental retardation X-linked) is one of the most frequently mutated tumor suppressor genes in human cancers, especially in glioma, and recent findings indicate roles for ATRX in key molecular pathways, such as the regulation of chromatin state, gene expression, and DNA damage repair, placing ATRX as a central player in the maintenance of genome stability and function. This has led to new perspectives about the functional role of ATRX and its relationship with cancer. Here, we provide an overview of ATRX interactions and molecular functions and discuss the consequences of its impairment, including alternative lengthening of telomeres and therapeutic vulnerabilities that may be exploited in cancer cells.
Collapse
Affiliation(s)
- Paula Aguilera
- Centro Andaluz de Biología Molecular y Medicina Regenerativa (CABIMER), Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla - Universidad Pablo de Olavide, Seville, Spain.
| | - Andrés J López-Contreras
- Centro Andaluz de Biología Molecular y Medicina Regenerativa (CABIMER), Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla - Universidad Pablo de Olavide, Seville, Spain.
| |
Collapse
|
13
|
Falcinelli M, Dell'Omo G, Grassi E, Mariella E, Leto SM, Scardellato S, Lorenzato A, Arena S, Bertotti A, Trusolino L, Bardelli A, d'Adda di Fagagna F. Colorectal cancer patient-derived organoids and cell lines harboring ATRX and/or DAXX mutations lack Alternative Lengthening of Telomeres (ALT). Cell Death Dis 2023; 14:96. [PMID: 36759506 PMCID: PMC9911751 DOI: 10.1038/s41419-023-05640-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 01/19/2023] [Accepted: 02/01/2023] [Indexed: 02/11/2023]
Abstract
Telomere maintenance is necessary to maintain cancer cell unlimited viability. However, the mechanisms maintaining telomere length in colorectal cancer (CRC) have not been extensively investigated. Telomere maintenance mechanisms (TMM) include the re-expression of telomerase or alternative lengthening of telomeres (ALT). ALT is genetically associated with somatic alterations in alpha-thalassemia/mental retardation X-linked (ATRX) and death domain-associated protein (DAXX) genes. Cells displaying ALT present distinctive features including C-circles made of telomeric DNA, long and heterogenous telomeric tracts, and telomeric DNA co-localized with promyelocytic leukemia (PML) bodies forming so-called ALT-associated PML bodies (APBs). Here, we identified mutations in ATRX and/or DAXX genes in an extensive collection of CRC samples including 119 patient-derived organoids (PDOs) and 232 established CRC cell lines. C-circles measured in CRC PDOs and cell lines showed low levels overall. We also observed that CRC PDOs and cell lines did not display a significant accumulation of APBs or long telomeres with no appreciable differences between wild-type and mutated ATRX/DAXX samples. Overall, our extensive analyses indicate that CRC is not prone to engage ALT, even when carrying genetic lesions in ATRX and/or DAXX, and support the notion that ATRX/DAXX genomic footprints are not reliable predictors of ALT.
Collapse
Affiliation(s)
- Marta Falcinelli
- IFOM ETS, The AIRC Institute of Molecular Oncology, Milan, Italy
| | - Giulia Dell'Omo
- IFOM ETS, The AIRC Institute of Molecular Oncology, Milan, Italy
| | - Elena Grassi
- Department of Oncology, University of Torino, 1060 Candiolo, Torino, Italy
- Candiolo Cancer Institute - FPO IRCCs, 10060 Candiolo, Torino, Italy
| | - Elisa Mariella
- Department of Oncology, University of Torino, 1060 Candiolo, Torino, Italy
- Candiolo Cancer Institute - FPO IRCCs, 10060 Candiolo, Torino, Italy
| | | | | | - Annalisa Lorenzato
- Department of Oncology, University of Torino, 1060 Candiolo, Torino, Italy
- Candiolo Cancer Institute - FPO IRCCs, 10060 Candiolo, Torino, Italy
| | - Sabrina Arena
- Department of Oncology, University of Torino, 1060 Candiolo, Torino, Italy
- Candiolo Cancer Institute - FPO IRCCs, 10060 Candiolo, Torino, Italy
| | - Andrea Bertotti
- Department of Oncology, University of Torino, 1060 Candiolo, Torino, Italy
- Candiolo Cancer Institute - FPO IRCCs, 10060 Candiolo, Torino, Italy
| | - Livio Trusolino
- Department of Oncology, University of Torino, 1060 Candiolo, Torino, Italy
- Candiolo Cancer Institute - FPO IRCCs, 10060 Candiolo, Torino, Italy
| | - Alberto Bardelli
- IFOM ETS, The AIRC Institute of Molecular Oncology, Milan, Italy
- Department of Oncology, University of Torino, 1060 Candiolo, Torino, Italy
- Candiolo Cancer Institute - FPO IRCCs, 10060 Candiolo, Torino, Italy
| | - Fabrizio d'Adda di Fagagna
- IFOM ETS, The AIRC Institute of Molecular Oncology, Milan, Italy.
- Institute of Molecular Genetics IGM-CNR "Luigi Luca Cavalli-Sforza", Pavia, Italy.
| |
Collapse
|
14
|
Du X, Wei H, Zhang B, Wang B, Li Z, Pang LK, Zhao R, Yao W. Molecular mechanisms of osteosarcoma metastasis and possible treatment opportunities. Front Oncol 2023; 13:1117867. [PMID: 37197432 PMCID: PMC10183593 DOI: 10.3389/fonc.2023.1117867] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 04/18/2023] [Indexed: 05/19/2023] Open
Abstract
In osteosarcoma patients, metastasis of the primary cancer is the leading cause of death. At present, management options to prevent metastasis are limited and non-curative. In this study, we review the current state of knowledge on the molecular mechanisms of metastasis and discuss promising new therapies to combat osteosarcoma metastasis. Genomic and epigenomic changes, metabolic reprogramming, transcription factors, dysregulation of physiologic pathways, and alterations to the tumor microenvironment are some of the changes reportedly involved in the regulation of osteosarcoma metastasis. Key factors within the tumor microenvironment include infiltrating lymphocytes, macrophages, cancer-associated fibroblasts, platelets, and extracellular components such as vesicles, proteins, and other secreted molecules. We conclude by discussing potential osteosarcoma-limiting agents and their clinical studies.
Collapse
Affiliation(s)
- Xinhui Du
- Bone Soft Tissue Department, The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital, Zhengzhou, China
- Key Laboratory for Digital Assessment of Spinal-Pelvic Tumor and Surgical Aid Tools Design (Zhengzhou), Zhengzhou, Henan, China
- Key Laboratory for Perioperative Digital Assessment of Bone Tumors (Henan), Zhengzhou, Henan, China
- *Correspondence: Xinhui Du,
| | - Hua Wei
- Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Boya Zhang
- Bone Soft Tissue Department, The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital, Zhengzhou, China
- Key Laboratory for Digital Assessment of Spinal-Pelvic Tumor and Surgical Aid Tools Design (Zhengzhou), Zhengzhou, Henan, China
- Key Laboratory for Perioperative Digital Assessment of Bone Tumors (Henan), Zhengzhou, Henan, China
| | - Bangmin Wang
- Bone Soft Tissue Department, The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital, Zhengzhou, China
- Key Laboratory for Digital Assessment of Spinal-Pelvic Tumor and Surgical Aid Tools Design (Zhengzhou), Zhengzhou, Henan, China
- Key Laboratory for Perioperative Digital Assessment of Bone Tumors (Henan), Zhengzhou, Henan, China
| | - Zhehuang Li
- Bone Soft Tissue Department, The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital, Zhengzhou, China
- Key Laboratory for Digital Assessment of Spinal-Pelvic Tumor and Surgical Aid Tools Design (Zhengzhou), Zhengzhou, Henan, China
- Key Laboratory for Perioperative Digital Assessment of Bone Tumors (Henan), Zhengzhou, Henan, China
| | - Lon Kai Pang
- Baylor College of Medicine, Houston, TX, United States
| | - Ruiying Zhao
- Department of Integrative Biology and Pharmacology, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, TX, United States
| | - Weitao Yao
- Bone Soft Tissue Department, The Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer Hospital, Zhengzhou, China
- Key Laboratory for Digital Assessment of Spinal-Pelvic Tumor and Surgical Aid Tools Design (Zhengzhou), Zhengzhou, Henan, China
- Key Laboratory for Perioperative Digital Assessment of Bone Tumors (Henan), Zhengzhou, Henan, China
| |
Collapse
|