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Villa A, William WN, Hanna GJ. Cancer Precursor Syndromes and Their Detection in the Head and Neck. Hematol Oncol Clin North Am 2024:S0889-8588(24)00033-9. [PMID: 38705773 DOI: 10.1016/j.hoc.2024.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2024]
Abstract
This article explores the multifaceted landscape of oral cancer precursor syndromes. Hereditary disorders like dyskeratosis congenita and Fanconi anemia increase the risk of malignancy. Oral potentially malignant disorders, notably leukoplakia, are discussed as precursors influenced by genetic and immunologic facets. Molecular insights delve into genetic mutations, allelic imbalances, and immune modulation as key players in precancerous progression, suggesting potential therapeutic targets. The article navigates the controversial terrain of management strategies of leukoplakia, encompassing surgical resection, chemoprevention, and immune modulation, while emphasizing the ongoing challenges in developing effective, evidence-based preventive approaches.
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Affiliation(s)
- Alessandro Villa
- Oral Medicine, Oral Oncology and Dentistry, Miami Cancer Institute, Baptist Health South Florida, 8900 N. Kendall Drive. Miami, FL 33176, USA; Herbert Wertheim College of Medicine, Florida International University, Miami, FL, USA
| | - William N William
- Thoracic Oncology Program, Grupo Oncoclínicas Grupo Oncoclínicas, Av. Pres. Juscelino Kubitschek, 510, 2º andar, São Paulo, São Paulo 04543-906, Brazil
| | - Glenn J Hanna
- Department of Medical Oncology, Center for Head & Neck Oncology, Dana-Farber Cancer Institute, Harvard Medical School, 450 Brookline Avenue, Dana Building, Room 2-140. Boston, MA 02215, USA.
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Rafii H, Volt F, Bierings M, Dalle JH, Ayas M, Rihani R, Faraci M, de Simone G, Sengeloev H, Passweg J, Cavazzana M, Costello R, Maertens J, Biffi A, Johansson JE, Montoro J, Guepin GR, Diaz MA, Sirvent A, Kenzey C, Rivera Franco MM, Cappelli B, Scigliuolo GM, Rocha V, Ruggeri A, Risitano A, De Latour RP, Gluckman E. Umbilical Cord Blood Transplantation for Fanconi Anemia With a Special Focus on Late Complications: a Study on Behalf of Eurocord and SAAWP-EBMT. Transplant Cell Ther 2024; 30:532.e1-532.e16. [PMID: 38452872 DOI: 10.1016/j.jtct.2024.02.024] [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: 01/18/2024] [Revised: 02/20/2024] [Accepted: 02/27/2024] [Indexed: 03/09/2024]
Abstract
Hematopoietic cell transplantation (HCT) remains the sole available curative treatment for Fanconi anemia (FA), with particularly favorable outcomes reported after matched sibling donor (MSD) HCT. This study aimed to describe outcomes, with a special focus on late complications, of FA patients who underwent umbilical cord blood transplantation (UCBT). In this retrospective analysis of allogeneic UCBT for FA performed between 1988 and 2021 in European Society for Blood and Marrow Transplantation (EBMT)-affiliated centers, a total of 205 FA patients underwent UCBT (55 related and 150 unrelated) across 77 transplant centers. Indications for UCBT were bone marrow failure in 190 patients and acute leukemia/myelodysplasia in 15 patients. The median age at transplantation was 9 years (range, 1.2 to 43 years), with only 20 patients aged >18 years. Among the donor-recipient pairs, 56% (n = 116) had a 0 to 1/6 HLA mismatch. Limited-field radiotherapy was administered to 28% (n = 58) and 78% (n = 160) received a fludarabine (Flu)-based conditioning regimen. Serotherapy consisted of antithymocyte globulin (n = 159; 78%) or alemtuzumab (n = 12; 6%). The median follow-up was 10 years for related UCBT and 7 years for unrelated UCBT. Excellent outcomes were observed in the setting of related UCBT, including a 60-day cumulative incidence (CuI) of neutrophil recovery of 98.1% (95% confidence interval [CI], 93.9% to 100%), a 100-day CuI of grade II-IV acute graft-versus-host disease (GVHD) of 17.3% (95% CI, 9.5% to 31.6%), and a 5-year CuI of chronic GVHD (cGVHD) of 22.7% (95% CI, 13.3% to 38.7%; 13% extensive). Five-year overall survival (OS) was 88%. In multivariate analysis, none of the factors included in the model predicted a better OS. In unrelated UCBT, the 60-day CuI of neutrophil recovery was 78.7% (95% CI, 71.9% to 86.3%), the 100-day CuI of grade II-IV aGVHD was 31.4% (95% CI, 24.6% to 40.2%), and the 5-year CuI of cGVHD was 24.3% (95% CI, 17.8% to 32.2%; 12% extensive). Five-year OS was 44%. In multivariate analysis, negative recipient cytomegalovirus serology, Flu-based conditioning, age <9 years at UCBT, and 0 to 1/6 HLA mismatch were associated with improved OS. A total of 106 patients, including 5 with acute leukemia/myelodysplasia, survived for >2 years after UCBT. Nine of these patients developed subsequent neoplasms (SNs), including 1 donor-derived acute myelogenous leukemia and 8 solid tumors, at a median of 9.7 years (range, 2.3 to 21.8 years) post-UCBT (1 related and 8 unrelated UCBT). In a subset of 49 patients with available data, late nonmalignant complications affecting various organ systems were observed at a median of 8.7 years (range, 2.7 to 28.8 years) post-UCBT. UCB is a valid source of stem cells for transplantation in patients with FA, with the best results observed after related UCBT. After unrelated UCBT, improved survival was observed in patients who underwent transplantation at a younger age, with Flu-based conditioning, and with better HLA parity. The incidence of organ-specific complications and SNs was relatively low. The incidence of SNs, mostly squamous cell carcinoma, increases with time. Rigorous follow-up and lifelong screening are crucial in survivors of UCBT for FA.
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Affiliation(s)
- Hanadi Rafii
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France
| | - Fernanda Volt
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France
| | - Marc Bierings
- Princess Maxima Center, University Hospital for Children, Utrecht, Netherlands
| | - Jean-Hugues Dalle
- Pediatric Hematology and Immunology Department, Robert Debré Hospital, Université Paris Cité, APHP, Paris, France
| | - Mouhab Ayas
- Department of Pediatric Hematology Oncology, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Rawad Rihani
- Pediatric Blood, Marrow and Cellular Therapy Program, King Hussein Cancer Centre, Amman, Jordan
| | - Maura Faraci
- Hematopoetic Stem Cell Unit, Department of Hematology-Oncology, IRCCS Istituto G. Gaslini, Genova, Italy
| | - Giuseppina de Simone
- Hematology and Stem Cell Transplant Unit, Azienda Ospedaliera di Rilievo Nazionale Santobono-Pausilipon, Napoli, Italy
| | - Henrik Sengeloev
- Bone Marrow Transplant Unit L 4043, National University Hospital, Copenhagen, Denmark
| | - Jakob Passweg
- Hematology Department, University Hospital of Basel, Basel, Switzerland
| | | | - Regis Costello
- Centre Hospitalier Universitaire La Conception, Marseille, France
| | - Johan Maertens
- Departement of Hematology,University Hospital Gasthuisberg, Leuven, Belgium
| | - Alessandra Biffi
- Pediatric Hematology, Oncology and Stem Cell Transplant Division, Padua University Hospital, Padua, Italy
| | | | | | | | | | - Anne Sirvent
- Pediatric Onco-Hematology Unit, CHU A de Villeneuve, Montpellier, France
| | - Chantal Kenzey
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France
| | - Monica M Rivera Franco
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France
| | - Barbara Cappelli
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France; Monacord, Centre Scientifique de Monaco, Monaco
| | - Graziana Maria Scigliuolo
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France; Monacord, Centre Scientifique de Monaco, Monaco
| | - Vanderson Rocha
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France; Hematology, Transfusion, and Cell Therapy Service and Laboratory of Medical Investigation in Pathogenesis and Directed Therapy in Onco-Immuno-Hematology (LIM-31), Hospital das Clínicas, Faculty of Medicine, São Paulo University, São Paulo, Brazil
| | - Annalisa Ruggeri
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France; Hematology and Bone Marrow Transplant Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Antonio Risitano
- University of Naples, Avellino, Italy; AORN San Giuseppe Moscati, Avellino, Italy
| | - Regis Peffault De Latour
- Bone Marrow Transplant Unit, Hôpital Saint Louis, Assistance Publique Hôpitaux de Paris, Paris, France
| | - Eliane Gluckman
- Eurocord, Institut de Recherche de Saint-Louis (IRSL) EA3518, Hôpital Saint-Louis, Université Paris Cité, Paris, France; Monacord, Centre Scientifique de Monaco, Monaco.
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Da Costa L, Mohandas N, David-NGuyen L, Platon J, Marie I, O'Donohue MF, Leblanc T, Gleizes PE. Diamond-Blackfan anemia, the archetype of ribosomopathy: How distinct is it from the other constitutional ribosomopathies? Blood Cells Mol Dis 2024:102838. [PMID: 38413287 DOI: 10.1016/j.bcmd.2024.102838] [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: 11/15/2023] [Revised: 02/16/2024] [Accepted: 02/16/2024] [Indexed: 02/29/2024]
Abstract
Diamond-Blackfan anemia (DBA) was the first ribosomopathy described in humans. DBA is a congenital hypoplastic anemia, characterized by macrocytic aregenerative anemia, manifesting by differentiation blockage between the BFU-e/CFU-e developmental erythroid progenitor stages. In 50 % of the DBA cases, various malformations are noted. Strikingly, for a hematological disease with a relative erythroid tropism, DBA is due to ribosomal haploinsufficiency in 24 different ribosomal protein (RP) genes. A few other genes have been described in DBA-like disorders, but they do not fit into the classical DBA phenotype (Sankaran et al., 2012; van Dooijeweert et al., 2022; Toki et al., 2018; Kim et al., 2017 [1-4]). Haploinsufficiency in a RP gene leads to defective ribosomal RNA (rRNA) maturation, which is a hallmark of DBA. However, the mechanistic understandings of the erythroid tropism defect in DBA are still to be fully defined. Erythroid defect in DBA has been recently been linked in a non-exclusive manner to a number of mechanisms that include: 1) a defect in translation, in particular for the GATA1 erythroid gene; 2) a deficit of HSP70, the GATA1 chaperone, and 3) free heme toxicity. In addition, p53 activation in response to ribosomal stress is involved in DBA pathophysiology. The DBA phenotype may thus result from the combined contributions of various actors, which may explain the heterogenous phenotypes observed in DBA patients, even within the same family.
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Affiliation(s)
- L Da Costa
- Service d'Hématologie Biologique (Hematology Diagnostic Lab), AP-HP, Hôpital Bicêtre, F-94270 Le Kremlin-Bicêtre, France; University of Paris Saclay, F-94270 Le Kremlin-Bicêtre, France; University of Paris Cité, F-75010 Paris, France; University of Picardie Jules Verne, F-80000 Amiens, France; Inserm U1170, IGR, F-94805 Villejuif/HEMATIM UR4666, F-80000 Amiens, France; Laboratory of Excellence for Red Cells, LABEX GR-Ex, F-75015 Paris, France.
| | | | - Ludivine David-NGuyen
- Service d'Hématologie Biologique (Hematology Diagnostic Lab), AP-HP, Hôpital Bicêtre, F-94270 Le Kremlin-Bicêtre, France
| | - Jessica Platon
- Inserm U1170, IGR, F-94805 Villejuif/HEMATIM UR4666, F-80000 Amiens, France
| | - Isabelle Marie
- Service d'Hématologie Biologique (Hematology Diagnostic Lab), AP-HP, Hôpital Bicêtre, F-94270 Le Kremlin-Bicêtre, France
| | - Marie Françoise O'Donohue
- Molecular, Cellular and Developmental biology department (MCD), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Thierry Leblanc
- Service d'immuno-hématologie pédiatrique, Hôpital Robert-Debré, F-75019 Paris, France
| | - Pierre-Emmanuel Gleizes
- Molecular, Cellular and Developmental biology department (MCD), Centre de Biologie Intégrative (CBI), Université de Toulouse, CNRS, UPS, Toulouse, France
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Mathavarajah S, Dellaire G. LINE-1: an emerging initiator of cGAS-STING signalling and inflammation that is dysregulated in disease. Biochem Cell Biol 2024; 102:38-46. [PMID: 37643478 DOI: 10.1139/bcb-2023-0134] [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] [Indexed: 08/31/2023] Open
Abstract
The cGAS-STING (cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING)) axis integrates DNA damage and cellular stress with type I interferon (IFN) signalling to facilitate transcriptional changes underlying inflammatory stress responses. The cGAS-STING pathway responds to cytosolic DNA in the form of double-stranded DNA, micronuclei, and long interspersed nuclear element 1 (L1) retroelements. L1 retroelements are a class of self-propagating non-long terminal repeat transposons that have remained highly active in mammalian genomes. L1 retroelements are emerging as important inducers of cGAS-STING and IFN signalling, which are often dysregulated in several diseases, including cancer. A key repressor of cGAS-STING and L1 activity is the exonuclease three prime repair exonuclease 1 (TREX1), and loss of TREX1 promotes the accumulation of L1. In addition, L1 dysregulation is a common theme among diseases with chronic induction of type I IFN signalling through cGAS-STING, such as Aicardi-Goutières syndrome, Fanconi anemia, and dermatomyositis. Although TREX1 is highly conserved in tetrapod species, other suppressor proteins exist that inhibit L1 retrotransposition. These suppressor genes when mutated are often associated with diseases characterized by unchecked inflammation that is associated with high cGAS-STING activity and elevated levels of L1 expression. In this review, we discuss these interconnected pathways of L1 suppression and their role in the regulation of cGAS-STING and inflammation in disease.
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Affiliation(s)
| | - Graham Dellaire
- Department of Pathology, Faculty of Medicine, Dalhousie University, Halifax, NS, Canada
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS, Canada
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5
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Steensma DP. Revisiting the first reported case of aplastic anaemia. Br J Haematol 2024; 204:455-458. [PMID: 38044033 DOI: 10.1111/bjh.19241] [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: 10/17/2023] [Revised: 11/15/2023] [Accepted: 11/21/2023] [Indexed: 12/05/2023]
Abstract
The great pathologist Paul Ehrlich in Berlin is commonly credited with describing the first clear case of aplastic anaemia in 1888: a 21-year-old woman who presented with haemorrhage and signs and symptoms of severe anaemia, quickly succumbing to her illness. Ehrlich's description of this patient's background and clinical course allowed individual identification. Re-analysis of this case suggests an inherited bone marrow failure syndrome as a possible additional diagnosis.
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Gavriilaki E, Tragiannidis A, Papathanasiou M, Besikli S, Karvouni P, Douka V, Paphianou E, Hatzipantelis E, Papaioannou G, Athanasiadou A, Marvaki A, Panteliadou AK, Vardi A, Batsis I, Syrigou A, Mallouri D, Lalayanni C, Sakellari I. Aplastic anemia and paroxysmal nocturnal hemoglobinuria in children and adults in two centers of Northern Greece. Front Oncol 2022; 12:947410. [PMID: 36439498 PMCID: PMC9684709 DOI: 10.3389/fonc.2022.947410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 10/17/2022] [Indexed: 09/14/2023] Open
Abstract
Bone marrow failure (BMF) syndromes are a group of various hematological diseases with cytopenia as a main common characteristic. Given their rarity and continuous progress in the field, we aim to provide data considering the efficiency and safety of the therapeutic methods, focusing on the treatment of aplastic anemia(AA) and paroxysmal nocturnal hemoglobinuria (PNH). We enrolled consecutive patients diagnosed with BMF in two referral centers of Northern Greece from 2008 to 2020. We studied 43 patients with AA (37 adults and 6 children/adolescents) and 6 with classical PNH. Regarding classical PNH, 4 patients have received eculizumab treatment with 1/4 presenting extravascular hemolysis. Among 43 patients with aplastic anemia, PNH clones were detected in 11. Regarding patients that did not receive alloHCT (n=15), 14/15 were treated with ATG and cyclosporine as first line, with the addition of eltrombopag in patients treated after its approval (n=9). With a median follow-up of 16.7 (1.8-56.2) months from diagnosis, 12/14 (85.7%) are alive (4-year OS: 85.1%). AlloHCT was performed in 28 patients. Five patients developed TA-TMA which did not resolve in 3/5 (all with a pre-transplant PNH clone). With the follow-up among survivors reaching 86.3 (6.3-262.4) months, 10-year OS was 56.9%, independently associated with PNH clones after adjusting for age (p=0.024). In conclusion, our real-world experience confirms that novel treatments are changing the field of BMF syndromes. Nevertheless, there is still an unmet need to personalize algorithms in this field.
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Affiliation(s)
- Eleni Gavriilaki
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Athanasios Tragiannidis
- 2Paediatric Department, American Hellenic Educational Progressive Association (AHEPA) Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Maria Papathanasiou
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Sotiria Besikli
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | | | - Vassiliki Douka
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Eleni Paphianou
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Emmanuel Hatzipantelis
- 2Paediatric Department, American Hellenic Educational Progressive Association (AHEPA) Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Giorgos Papaioannou
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Anastasia Athanasiadou
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Anastasia Marvaki
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Alkistis-Kira Panteliadou
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Anna Vardi
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Ioannis Batsis
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Antonia Syrigou
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Despina Mallouri
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Chrysavgi Lalayanni
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
| | - Ioanna Sakellari
- Hematology Department and Bone Marrow Transplant (BMT) Unit, G Papanicolaou Hospital, Thessaloniki, Greece
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Kiumarsi A, Mousavi SA, Kasaeian A, Rostami T, Rad S, Ghavamzadeh A, Mousavi SA. Radiation-free Reduced-intensity Hematopoietic Stem Cell Transplantation with In-Vivo T-cell Depletion from Matched Related and Unrelated Donors for Fanconi Anemia: Prognostic Factor Analysis. Exp Hematol 2022; 109:27-34. [DOI: 10.1016/j.exphem.2022.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 02/11/2022] [Accepted: 02/14/2022] [Indexed: 11/25/2022]
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Narla A. When to worry about inherited bone marrow failure and myeloid malignancy predisposition syndromes in the setting of a hypocellular marrow. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2021; 2021:153-156. [PMID: 34889379 PMCID: PMC8791095 DOI: 10.1182/hematology.2021000246] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
With our increasing understanding of inherited marrow failure and myeloid malignancy predisposition syndromes, it has become clear that there is a wide phenotypic spectrum and that these diseases must be considered in the differential diagnosis of both children and adults with unexplained defects in hematopoiesis. Moreover, these conditions are not as rare as previously believed and may present as aplastic anemia, myelodysplastic syndrome, or malignancy over a range of ages. Establishing the correct diagnosis is essential because it has implications for treatment, medical management, cancer screening, and family planning. Our goal is to highlight insights into the pathophysiology of these diseases, review cryptic presentations of these syndromes, and provide useful references for the practicing hematologist.
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Affiliation(s)
- Anupama Narla
- Correspondence Anupama Narla, Stanford University School of Medicine, CCSR South 1215b, 269 Campus Dr, Stanford, CA 94305-5162; e-mail:
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Gueiderikh A, Maczkowiak-Chartois F, Rosselli F. A new frontier in Fanconi anemia: From DNA repair to ribosome biogenesis. Blood Rev 2021; 52:100904. [PMID: 34750031 DOI: 10.1016/j.blre.2021.100904] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 10/14/2021] [Accepted: 10/26/2021] [Indexed: 12/27/2022]
Abstract
Described by Guido Fanconi almost 100 years ago, Fanconi anemia (FA) is a rare genetic disease characterized by developmental abnormalities, bone marrow failure (BMF) and cancer predisposition. The proteins encoded by FA-mutated genes (FANC proteins) and assembled in the so-called FANC/BRCA pathway have key functions in DNA repair and replication safeguarding, which loss leads to chromosome structural aberrancies. Therefore, since the 1980s, FA has been considered a genomic instability and chromosome fragility syndrome. However, recent findings have demonstrated new and unexpected roles of FANC proteins in nucleolar homeostasis and ribosome biogenesis, the alteration of which impacts cellular proteostasis. Here, we review the different cellular, biochemical and molecular anomalies associated with the loss of function of FANC proteins and discuss how these anomalies contribute to BMF by comparing FA to other major inherited BMF syndromes. Our aim is to determine the extent to which alterations in the DNA damage response in FA contribute to BMF compared to the consequences of the loss of function of the FANC/BRCA pathway on the other roles of the pathway.
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Affiliation(s)
- Anna Gueiderikh
- CNRS - UMR9019, Équipe labellisée "La Ligue contre le Cancer", 94805 Villejuif, France; Gustave Roussy Cancer Center, 94805 Villejuif, France; Université Paris-Saclay - Paris Sud, Orsay, France.
| | - Frédérique Maczkowiak-Chartois
- CNRS - UMR9019, Équipe labellisée "La Ligue contre le Cancer", 94805 Villejuif, France; Gustave Roussy Cancer Center, 94805 Villejuif, France; Université Paris-Saclay - Paris Sud, Orsay, France.
| | - Filippo Rosselli
- CNRS - UMR9019, Équipe labellisée "La Ligue contre le Cancer", 94805 Villejuif, France; Gustave Roussy Cancer Center, 94805 Villejuif, France; Université Paris-Saclay - Paris Sud, Orsay, France.
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Germline variants in DNA repair genes are associated with young-onset head and neck cancer. Oral Oncol 2021; 122:105545. [PMID: 34598035 DOI: 10.1016/j.oraloncology.2021.105545] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 08/27/2021] [Accepted: 09/21/2021] [Indexed: 01/04/2023]
Abstract
The genetic predisposition to head and neck carcinomas (HNSCC) and how the known risk factors (papillomavirus infection, alcohol, and tobacco consumption) contribute to the early-onset disease are barely explored. Although HNSCC at early onset is rare, its frequency is increasing in recent years. Germline and somatic variants were assessed to build a comprehensive genetic influence pattern in HNSCC predisposition and patient outcome. Whole-exome sequencing was performed in 45 oral and oropharynx carcinomas paired with normal samples of young adults (≤49 years). We found FANCG, CDKN2A, and TPP germline variants previously associated with HNSCC risk. At least one germline variant in DNA repair pathway genes was detected in 67% of cases. Germline and somatic variants (including copy number variations) in FAT1 gene were identified in 9 patients (20%) and 12 tumors (30%), respectively. Somatic variants were found in HNSCC associated genes, such as TP53, CDKN2A, and PIK3CA. To date, 55 of 521 cases from the large cohort of TCGA presented < 49 years old. A comparison between the somatic alterations of TCGA-HNSCC at early onset and our dataset revealed strong similarities. Protein-protein interaction analysis between somatic and germline altered genes revealed a central role of TP53. Altogether, germline alterations in DNA repair genes potentially contribute to an increased risk of developing HNSCC at early-onset, while FAT1 could impact the prognosis.
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Gianni P, Matenoglou E, Geropoulos G, Agrawal N, Adnani H, Zafeiropoulos S, Miyara SJ, Guevara S, Mumford JM, Molmenti EP, Giannis D. The Fanconi anemia pathway and Breast Cancer: A comprehensive review of clinical data. Clin Breast Cancer 2021; 22:10-25. [PMID: 34489172 DOI: 10.1016/j.clbc.2021.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 07/17/2021] [Accepted: 08/05/2021] [Indexed: 02/08/2023]
Abstract
The development of breast cancer depends on several risk factors, including environmental, lifestyle and genetic factors. Despite the evolution of DNA sequencing techniques and biomarker detection, the epidemiology and mechanisms of various breast cancer susceptibility genes have not been elucidated yet. Dysregulation of the DNA damage response causes genomic instability and increases the rate of mutagenesis and the risk of carcinogenesis. The Fanconi Anemia (FA) pathway is an important component of the DNA damage response and plays a critical role in the repair of DNA interstrand crosslinks and genomic stability. The FA pathway involves 22 recognized genes and specific mutations have been identified as the underlying defect in the majority of FA patients. A thorough understanding of the function and epidemiology of these genes in breast cancer is critical for the development and implementation of individualized therapies that target unique tumor profiles. Targeted therapies (PARP inhibitors) exploiting the FA pathway gene defects have been developed and have shown promising results. This narrative review summarizes the current literature on the involvement of FA genes in sporadic and familial breast cancer with a focus on clinical data derived from large cohorts.
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Affiliation(s)
- Panagiota Gianni
- Department of Internal Medicine III, Hematology, Oncology, Palliative Medicine, Rheumatology and Infectious Diseases, University Hospital Ulm, Germany
| | - Evangelia Matenoglou
- Medical School, Aristotle University of Thessaloniki, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Georgios Geropoulos
- Thoracic Surgery Department, University College London Hospitals NHS Foundation Trust, London
| | - Nirav Agrawal
- Feinstein Institutes for Medical Research at Northwell Health, Manhasset, New York, NY
| | - Harsha Adnani
- Feinstein Institutes for Medical Research at Northwell Health, Manhasset, New York, NY
| | - Stefanos Zafeiropoulos
- Feinstein Institutes for Medical Research at Northwell Health, Manhasset, New York, NY; Elmezzi Graduate School of Molecular Medicine, Northwell Health, Manhasset, New York, NY
| | - Santiago J Miyara
- Feinstein Institutes for Medical Research at Northwell Health, Manhasset, New York, NY; Elmezzi Graduate School of Molecular Medicine, Northwell Health, Manhasset, New York, NY
| | - Sara Guevara
- Department of Surgery, North Shore University Hospital, Manhasset, New York, NY
| | - James M Mumford
- Department of Family Medicine, Glen Cove Hospital, Glen Cove, New York, NY; Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Hempstead, New York, NY
| | - Ernesto P Molmenti
- Feinstein Institutes for Medical Research at Northwell Health, Manhasset, New York, NY; Department of Surgery, North Shore University Hospital, Manhasset, New York, NY; Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, Hempstead, New York, NY
| | - Dimitrios Giannis
- Feinstein Institutes for Medical Research at Northwell Health, Manhasset, New York, NY.
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Guo Y, Liao X, Zou P, Xiao J. Acute myeloid leukemia arising to genetic susceptibility genes related T cell acute lymphoblastic leukemia: case report. AME Case Rep 2021; 5:29. [PMID: 34312608 DOI: 10.21037/acr-20-151] [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: 10/19/2020] [Accepted: 04/09/2021] [Indexed: 11/06/2022]
Abstract
Fanconi anemia (FA) is the most common inherited bone marrow failure disorder, with a predisposition to neoplasia. While Myelodysplastic syndromes (MDS) and acute myeloid leukemia (AML) are the most common hematologic malignancies seen in patients with FA, cases of acute lymphoblastic leukemia (ALL) have also been described in the literature but it is uncommon. In our case report, a 12 years 5 months old boy, who was detected with heterozygote mutation of FANCC gene and nonsynonymous single nucleotide variability (SNV) mutation of AKAP9 gene, presented with precursor T cell ALL (T-ALL) at onset, myelodysplasia or myeloid biomarkers were not found at initial diagnosis. He received chemotherapy and achieved complete remission (CR) after a course of remission induction, but severe cytopenia was presented, sepsis and Invasive fungal infection also arose. With following-up and continue chemotherapy, secondary AML arose 17 months later, the patient died of sepsis related to chemotherapy at AML status. FA patients usually presented with homozygous or bilateral heterozygosity mutation in literature reports, whereas heterozygosity gene mutation of FANCC and AKAP9 has not reported yet. AKAP9 protein which was encoded by AKAP9 gene is widely distributed in many kinds of cells, thus ensuring the specificity and accuracy of signal transduction. We speculate that AKAP9 protein may interfere with the normal signal transduction of heterozygous mutation expression of FANCC gene and result in the inactivation of FANCC gene function. Unfortunately, the patient died of sepsis and we don't have enough blood samples to explore the role of AKAP9 gene mutation in patients with heterozygosity FANCC gene mutation.
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Affiliation(s)
- Yuxia Guo
- Department of Hematology, Children's Hospital of Chongqing Medical University, Chongqing, China.,Chongqing Key Laboratory of Pediatrics, Chongqing, China
| | - Xin Liao
- Department of Hematology, Children's Hospital of Chongqing Medical University, Chongqing, China.,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, China
| | - Pinli Zou
- Department of Hematology, Children's Hospital of Chongqing Medical University, Chongqing, China.,Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing, China
| | - Jianwen Xiao
- Department of Hematology, Children's Hospital of Chongqing Medical University, Chongqing, China.,China International Science and Technology Cooperation Center for Child Development and Disorders, Chongqing, China
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Anurogo D, Yuli Prasetyo Budi N, Thi Ngo MH, Huang YH, Pawitan JA. Cell and Gene Therapy for Anemia: Hematopoietic Stem Cells and Gene Editing. Int J Mol Sci 2021; 22:ijms22126275. [PMID: 34200975 PMCID: PMC8230702 DOI: 10.3390/ijms22126275] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/06/2021] [Accepted: 06/07/2021] [Indexed: 12/23/2022] Open
Abstract
Hereditary anemia has various manifestations, such as sickle cell disease (SCD), Fanconi anemia, glucose-6-phosphate dehydrogenase deficiency (G6PDD), and thalassemia. The available management strategies for these disorders are still unsatisfactory and do not eliminate the main causes. As genetic aberrations are the main causes of all forms of hereditary anemia, the optimal approach involves repairing the defective gene, possibly through the transplantation of normal hematopoietic stem cells (HSCs) from a normal matching donor or through gene therapy approaches (either in vivo or ex vivo) to correct the patient’s HSCs. To clearly illustrate the importance of cell and gene therapy in hereditary anemia, this paper provides a review of the genetic aberration, epidemiology, clinical features, current management, and cell and gene therapy endeavors related to SCD, thalassemia, Fanconi anemia, and G6PDD. Moreover, we expound the future research direction of HSC derivation from induced pluripotent stem cells (iPSCs), strategies to edit HSCs, gene therapy risk mitigation, and their clinical perspectives. In conclusion, gene-corrected hematopoietic stem cell transplantation has promising outcomes for SCD, Fanconi anemia, and thalassemia, and it may overcome the limitation of the source of allogenic bone marrow transplantation.
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Affiliation(s)
- Dito Anurogo
- International PhD Program for Cell Therapy and Regeneration Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan; (D.A.); (N.Y.P.B.); (M.-H.T.N.)
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
- Faculty of Medicine and Health Sciences, Universitas Muhammadiyah Makassar, Makassar 90221, Indonesia
| | - Nova Yuli Prasetyo Budi
- International PhD Program for Cell Therapy and Regeneration Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan; (D.A.); (N.Y.P.B.); (M.-H.T.N.)
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
| | - Mai-Huong Thi Ngo
- International PhD Program for Cell Therapy and Regeneration Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan; (D.A.); (N.Y.P.B.); (M.-H.T.N.)
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
| | - Yen-Hua Huang
- International PhD Program for Cell Therapy and Regeneration Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan; (D.A.); (N.Y.P.B.); (M.-H.T.N.)
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
- Research Center of Cell Therapy and Regeneration Medicine, Taipei Medical University, Taipei 11031, Taiwan
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
- Center for Reproductive Medicine, Taipei Medical University Hospital, Taipei 11031, Taiwan
- Comprehensive Cancer Center, Taipei Medical University, Taipei 11031, Taiwan
- Research Center of Cancer Translational Medicine, Taipei Medical University, Taipei 11031, Taiwan
- PhD Program for Translational Medicine, College of Medical Science and Technology, Taipei Medical University, Taipei 11031, Taiwan
- Correspondence: (Y.-H.H.); (J.A.P.); Tel.: +886-2-2736-1661 (ext. 3150) (Y.-H.H.); +62-812-9535-0097 (J.A.P.)
| | - Jeanne Adiwinata Pawitan
- Department of Histology, Faculty of Medicine, Universitas Indonesia, Jakarta 10430, Indonesia
- Stem Cell Medical Technology Integrated Service Unit, Cipto Mangunkusumo Central Hospital, Faculty of Medicine, Universitas Indonesia, Jakarta 10430, Indonesia
- Stem Cell and Tissue Engineering Research Center, Indonesia Medical Education and Research Institute (IMERI), Faculty of Medicine, Universitas Indonesia, Jakarta 10430, Indonesia
- Correspondence: (Y.-H.H.); (J.A.P.); Tel.: +886-2-2736-1661 (ext. 3150) (Y.-H.H.); +62-812-9535-0097 (J.A.P.)
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Wu L, Li X, Lin Q, Chowdhury F, Mazumder MH, Du W. FANCD2 and HES1 suppress inflammation-induced PPARɣ to prevent haematopoietic stem cell exhaustion. Br J Haematol 2021; 192:652-663. [PMID: 33222180 PMCID: PMC7856217 DOI: 10.1111/bjh.17230] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 10/12/2020] [Accepted: 10/16/2020] [Indexed: 12/18/2022]
Abstract
The Fanconi anaemia protein FANCD2 suppresses PPARƔ to maintain haematopoietic stem cell's (HSC) function; however, the underlying mechanism is not known. Here we show that FANCD2 acts in concert with the Notch target HES1 to suppress inflammation-induced PPARƔ in HSC maintenance. Loss of HES1 exacerbates FANCD2-KO HSC defects. However, deletion of HES1 does not cause more severe inflammation-mediated HSC defects in FANCD2-KO mice, indicating that both FANCD2 and HES1 are required for limiting detrimental effects of inflammation on HSCs. Further analysis shows that both FANCD2 and HES1 are required for transcriptional repression of inflammation-activated PPARg promoter. Inflammation orchestrates an overlapping transcriptional programme in HSPCs deficient for FANCD2 and HES1, featuring upregulation of genes in fatty acid oxidation (FAO) and oxidative phosphorylation. Loss of FANCD2 or HES1 augments both basal and inflammation-primed FAO. Targeted inhibition of PPARƔ or the mitochondrial carnitine palmitoyltransferase-1 (CPT1) reduces FAO and ameliorates HSC defects in inflammation-primed HSPCs deleted for FANCD2 or HES1 or both. Finally, depletion of PPARg or CPT1 restores quiescence in these mutant HSCs under inflammatory stress. Our results suggest that this novel FANCD2/HES1/PPARƔ axis may constitute a key component of immunometabolic regulation, connecting inflammation, cellular metabolism and HSC function.
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Affiliation(s)
- Limei Wu
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University
| | - Xue Li
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University
| | - Qiqi Lin
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University
| | - Fabliha Chowdhury
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University
| | - Md H. Mazumder
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University
| | - Wei Du
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University
- Alexander B. Osborn Hematopoietic Malignancy and Transplantation Program, West Virginia University Cancer Institute, Morgantown, WV
- Division of Hematology and Oncology, University of Pittsburgh School of Medicine
- Genome Stability Program, UPMC Hillman Cancer Center, Pittsburgh, PA, USA
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Pagano G, Tiano L, Pallardó FV, Lyakhovich A, Mukhopadhyay SS, Di Bartolomeo P, Zatterale A, Trifuoggi M. Re-definition and supporting evidence toward Fanconi Anemia as a mitochondrial disease: Prospects for new design in clinical management. Redox Biol 2021; 40:101860. [PMID: 33445068 PMCID: PMC7806517 DOI: 10.1016/j.redox.2021.101860] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/05/2021] [Accepted: 01/05/2021] [Indexed: 12/24/2022] Open
Abstract
Fanconi anemia (FA) has been investigated since early studies based on two definitions, namely defective DNA repair and proinflammatory condition. The former definition has built up the grounds for FA diagnosis as excess sensitivity of patients’ cells to xenobiotics as diepoxybutane and mitomycin C, resulting in typical chromosomal abnormalities. Another line of studies has related FA phenotype to a prooxidant state, as detected by both in vitro and ex vivo studies. The discovery that the FA group G (FANCG) protein is found in mitochondria (Mukhopadhyay et al., 2006) has been followed by an extensive line of studies providing evidence for multiple links between other FA gene products and mitochondrial dysfunction. The fact that FA proteins are encoded by nuclear, not mitochondrial DNA does not prevent these proteins to hamper mitochondrial function, as it is recognized that most mitochondrial proteins are of nuclear origin. This body of evidence supporting a central role of mitochondrial dysfunction, along with redox imbalance in FA, should lead to the re-definition of FA as a mitochondrial disease. A body of literature has demonstrated the beneficial effects of mitochondrial cofactors, such as α-lipoic acid, coenzyme Q10, and carnitine on patients affected by mitochondrial diseases. Altogether, this re-definition of FA as a mitochondrial disease and the prospect use of mitochondrial nutrients may open new gateways toward mitoprotective strategies for FA patients. These strategies are expected to mitigate the mitochondrial dysfunction and prooxidant state in FA patients, and potentially protect transplanted FA patients from post-transplantation malignancies.
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Affiliation(s)
- Giovanni Pagano
- Department of Chemical Sciences, Federico II Naples University, I-80126, Naples, Italy.
| | - Luca Tiano
- Department of Life and Environmental Sciences, Polytechnical University of Marche, I-60121, Ancona, Italy
| | - Federico V Pallardó
- Department of Physiology, Faculty of Medicine and Dentistry, University of Valencia-INCLIVA, CIBERER, E-46010, Valencia, Spain
| | - Alex Lyakhovich
- Institute of Molecular Biology and Biophysics of the "Federal Research Center of Fundamental and Translational Medicine", 630117, Novosibirsk, Russia
| | - Sudit S Mukhopadhyay
- Department of Biotechnology, National Institute of Technology Durgapur, Durgapur, West Bengal, 713209, India
| | | | | | - Marco Trifuoggi
- Department of Chemical Sciences, Federico II Naples University, I-80126, Naples, Italy
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16
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Siddiqui F, Ansari S, Agha A, Nusrat N, Munzir S, Shan S, Hanifa A, Farzana T, Taj M, Borhany M, Hussain Z, Nadeem M, Shamsi T. Chromosomal Breakage in Fanconi Anemia and Consanguineous Marriages: A Social Dilemma for Developing Countries. Cureus 2020; 12:e10440. [PMID: 33072450 PMCID: PMC7557111 DOI: 10.7759/cureus.10440] [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] [Indexed: 11/05/2022] Open
Abstract
Introduction A clear picture of the prevalence of Fanconi anemia is not known due to limited studies and research of the subject. This study will detect the frequency of positive chromosomal breakage in pediatric aplastic patients and provide the evidence-based guidelines which help in consideration of appropriate treatment and awareness to the society. Methods A total of 104 aplastic anemia patients were recruited of age <18 years whose samples were tested for chromosomal breakage with mitomycin C (MMC). History of consanguinity between parents were documented for all the patients referred to us. Result Out of 104 diagnosed aplastic anemia patients, 35 (33.7%) patients were found to be Fanconi positive. Mean age of all hypoplastic patients for aplastic anemia and Fanconi anemia was 10.7 ± 4.5 and 10.6 ± 3.5, respectively. Male preponderance was found to be higher (64, 61.5%) as compared to females (40, 38.5%) in aplastic patients. The male to female ratio was observed as 2.5:1 in Fanconi patients while 1.3:1 in non-Fanconi aplastic patients. Parental consanguinity was observed in 33 (94.2%) with Fanconi anemia. Conclusion Fanconi anemia accounts for significant number of patients with hypoplastic bone marrow, therefore consanguineous marriages should be avoided through mass education in Pakistan.
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Affiliation(s)
- Fakeha Siddiqui
- Internal Medicine, Dow University of Health Sciences, Karachi, PAK
| | - Saqib Ansari
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Akbar Agha
- Hematology, Dow University of Health Sciences, Karachi, PAK
| | - Nadeem Nusrat
- Hematology, Dow University of Health Sciences, Karachi, PAK
| | - Saima Munzir
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Saira Shan
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Anny Hanifa
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Tasneem Farzana
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Mehwesh Taj
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Munira Borhany
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Zeeshan Hussain
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Muhammad Nadeem
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
| | - Tahir Shamsi
- Hematology, National Institute of Blood Diseases and Bone Marrow Transplantation, Karachi, PAK
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17
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Subcellular localization of FANCD2 is associated with survival in ovarian carcinoma. Oncotarget 2020; 11:775-783. [PMID: 32165999 PMCID: PMC7055545 DOI: 10.18632/oncotarget.27437] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Accepted: 12/21/2019] [Indexed: 01/23/2023] Open
Abstract
Objective: Ovarian cancer is a leading cause of death from gynecological cancers. Late diagnosis and resistance to therapy results in mortality and effective screening is required for early diagnosis and better treatments. Expression of the Fanconi Anemia complementation group D2 protein (FANCD2) is reduced in ovarian surface epithelial cells (OSE) in patients with ovarian cancer. FANCD2 has been studied for its role in DNA repair; however multiple studies have suggested that FANCD2 has a role outside the nucleus. We sought to determine whether subcellular localization of FANCD2 correlates with patient outcome in ovarian cancer. Methods: We examined the subcellular localization of FANCD2 in primary OSE cells from consenting patients with ovarian cancer or a normal ovary. Ovarian tissue microarray was stained with anti-FANCD2 antibody by immunohistochemistry and the correlation of FANCD2 localization with patient outcomes was assessed. FANCD2 binding partners were identified by immunoprecipitation of cytoplasmic FANCD2. Results: Nuclear and cytoplasmic localization of FANCD2 was observed in OSEs from both normal and ovarian cancer patients. Patients with cytoplasmic localization of FANCD2 (cFANCD2) experienced significantly longer median survival time (50 months), versus patients without cytoplasmic localization of FANCD2 (38 months; p < 0.05). Cytoplasmic FANCD2 was found to bind proteins involved in the innate immune system, cellular response to heat stress, amyloid fiber formation and estrogen mediated signaling. Conclusions: Our results suggest that the presence of cytoplasmic FANCD2 modulates FANCD2 activity resulting in better survival outcome in ovarian cancer patients.
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Results of Allogenic Hematopoietic Stem Cell Transplantation in Fanconi Anemia Caused by Bone Marrow Failure: Single-Regimen, Single-Center Experience of 14 Years. Biol Blood Marrow Transplant 2019; 25:2017-2023. [DOI: 10.1016/j.bbmt.2019.05.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 05/30/2019] [Accepted: 05/31/2019] [Indexed: 12/24/2022]
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19
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Luo E, Shi B, Chen QM, Zhou XD. [Dental-craniofacial manifestation and treatment of rare diseases in China]. HUA XI KOU QIANG YI XUE ZA ZHI = HUAXI KOUQIANG YIXUE ZAZHI = WEST CHINA JOURNAL OF STOMATOLOGY 2019; 37:130-142. [PMID: 31168978 DOI: 10.7518/hxkq.2019.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Rare diseases are genetic, chronic, and incurable disorders with relatively low prevalence. Thus, diagnosis and management strategies for such diseases are currently limited. This situation is exacerbated by insufficient medical sources for these diseases. The National Health and Health Committee of China recently first provided a clear definition of 121 rare diseases in the Chinese population. In this study, we summarize several dental-craniofacial manifestations associated with some rare diseases to provide a reference for dentists and oral maxillofacial surgeons aiming at fast-tracking diagnosis for the management of these rare diseases.
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Affiliation(s)
- En Luo
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Bing Shi
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Qian-Ming Chen
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Xue-Dong Zhou
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
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20
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Luo E, Liu H, Zhao Q, Shi B, Chen Q. Dental-craniofacial manifestation and treatment of rare diseases. Int J Oral Sci 2019; 11:9. [PMID: 30783081 PMCID: PMC6381182 DOI: 10.1038/s41368-018-0041-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 10/22/2018] [Accepted: 10/28/2018] [Indexed: 02/05/2023] Open
Abstract
Rare diseases are usually genetic, chronic and incurable disorders with a relatively low incidence. Developments in the diagnosis and management of rare diseases have been relatively slow due to a lack of sufficient profit motivation and market to attract research by companies. However, due to the attention of government and society as well as economic development, rare diseases have been gradually become an increasing concern. As several dental-craniofacial manifestations are associated with rare diseases, we summarize them in this study to help dentists and oral maxillofacial surgeons provide an early diagnosis and subsequent management for patients with these rare diseases.
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Affiliation(s)
- En Luo
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Hanghang Liu
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Qiucheng Zhao
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Bing Shi
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
| | - Qianming Chen
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
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21
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Abstract
Fanconi anemia (FA) is a disease of DNA repair characterized by bone marrow failure and a reduced ability to remove DNA interstrand cross-links. Here, we provide evidence that the FA protein FANCI also functions in ribosome biogenesis, the process of making ribosomes that initiates in the nucleolus. We show that FANCI localizes to the nucleolus and is functionally and physically tied to the transcription of pre-ribosomal RNA (pre-rRNA) and to large ribosomal subunit (LSU) pre-rRNA processing independent of FANCD2. While FANCI is known to be monoubiquitinated when activated for DNA repair, we find that it is predominantly in the deubiquitinated state in the nucleolus, requiring the nucleoplasmic deubiquitinase (DUB) USP1 and the nucleolar DUB USP36. Our model suggests a possible dual pathophysiology for FA that includes defects in DNA repair and in ribosome biogenesis.
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22
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Wu L, Amarachintha S, Xu J, Oley F, Du W. Mesenchymal COX2-PG secretome engages NR4A-WNT signalling axis in haematopoietic progenitors to suppress anti-leukaemia immunity. Br J Haematol 2018; 183:445-456. [PMID: 30106181 DOI: 10.1111/bjh.15548] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 07/05/2018] [Indexed: 02/02/2023]
Abstract
The bone marrow (BM) microenvironment (niche) plays important roles in supporting normal/abnormal haematopoiesis. We investigated the interaction between leukaemic mesenchymal niche and haematopoietic stem and progenitor cells (HSPCs) using the model of Fanconi anaemia (FA), a genetic disorder characterized by BM failure and leukaemia. Healthy donor HSPCs co-cultured on mesenchymal stromal cells (MSCs) derived from FA patients with acute myeloid leukaemia (AML) exhibited higher human engraftment and myeloid expansion in Non-obese diabetic severe combined immunodeficiency IL-2γ-/- /SGM3 recipients. Untargeted metabolomics analysis revealed the progressively elevated prostaglandins (PGs) in the MSCs of FA patients with myelodysplastic syndromes (MDS) and AML. Reduced secretion of PGs subsequent to inflammatory cyclooxygenase 2 (COX2) inhibition ameliorated HSPC/myeloid expansion. Transcriptome analysis demonstrated dysregulation of genes involved in the NR4A family of transcription factors (TFs) and WNT/β-catenin signalling pathway in FA-AML-MSC-co-cultured-CD34+ cells. COX2 inhibition led to significantly decreased NR4A TFs and WNT signalling genes expression. Mechanistically, NR4A1 and NR4A2 synergistically activate the CTNNB1 gene promoter . Knocking down CTNNB1 or NR4A1 in AML-MSC-co-cultured-CD34+ cells increased leukaemia-reactive T-effector cells production and rescued anti-leukaemia immunity. Together, these findings suggest that specific interactions between leukaemic mesenchymal niche and HSPCs orchestrate a novel COX2/PG-NR4A/WNT signalling axis, connecting inflammation, cellular metabolism and cancer immunity.
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Affiliation(s)
- Limei Wu
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University, Morgantown, WV, USA
| | - Surya Amarachintha
- The Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Jian Xu
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University, Morgantown, WV, USA.,Institute for Brain Research and Rehabilitation, South China Normal University, Guangzhou, China
| | - Frank Oley
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University, Morgantown, WV, USA
| | - Wei Du
- Department of Pharmaceutical Sciences, School of Pharmacy, West Virginia University, Morgantown, WV, USA.,West Virginia University Cancer Institute, Morgantown, WV, USA
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24
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Abstract
An improved understanding of the bone marrow failure (BMF) mechanisms in Fanconi anemia (FA) may improve current therapeutic strategies. Zhang et al. identify hyperactive TGF-β signaling as an underlying cause of BMF in FA mice and patient cells, whose inhibition promotes DNA repair and hematopoietic stem and progenitor cell survival.
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Affiliation(s)
- Hemanth Tummala
- Centre for Genomics and Child Health, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London and Barts Health, London, E12AT, UK
| | - Inderjeet Dokal
- Centre for Genomics and Child Health, Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London and Barts Health, London, E12AT, UK.
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25
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Ding H, Hashem H, Cabral L, Rangarajan H, Abusin G, Lazarus HM, Abu-Arja R. Azacitidine as a bridge to allogeneic hematopoietic cell transplantation in a pediatric patient with Fanconi anemia and acute myeloid leukemia. Pediatr Transplant 2017; 21. [PMID: 27976488 DOI: 10.1111/petr.12870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/10/2016] [Indexed: 11/28/2022]
Abstract
HCT is the definitive therapy for patients with FA and AML. Conventional cytotoxic agents cause potential DNA damage, and currently, there is no established regimen for these patients prior to HCT. A 13-year-old male with FA and refractory AML was given azacitidine, achieved morphologic remission and underwent HCT. At 95 days after HCT, he relapsed. Azacitidine along with DLI was used as first salvage therapy. Azacitidine was overall well tolerated with minimal side effects. In patients with AML and FA, azacitidine can be considered an alternative to conventional chemotherapy.
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Affiliation(s)
- Hilda Ding
- Pediatric Hematology-Oncology and Bone Marrow Transplantation, University Hospitals Rainbow Babies & Children's Hospital/Case Medical Center, Cleveland, OH, USA
| | - Hasan Hashem
- Pediatric Hematology-Oncology and Bone Marrow Transplantation, University Hospitals Rainbow Babies & Children's Hospital/Case Medical Center, Cleveland, OH, USA
| | - Linda Cabral
- Pediatric Hematology-Oncology and Bone Marrow Transplantation, University Hospitals Rainbow Babies & Children's Hospital/Case Medical Center, Cleveland, OH, USA
| | - Hemalatha Rangarajan
- Pediatric Hematology Oncology and Bone Marrow Transplant, Nationwide Children's Hospital, Columbus, OH, USA
| | - Ghada Abusin
- Pediatric Hematology/Oncology and Bone Marrow Transplant, University of Iowa Children's Hospital, Iowa City, IA, USA
| | - Hillard M Lazarus
- Department of Medicine-Hematology and Oncology, University Hospitals Case Medical Center, Cleveland, OH, USA
| | - Rolla Abu-Arja
- Pediatric Hematology Oncology and Bone Marrow Transplant, Nationwide Children's Hospital, Columbus, OH, USA
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26
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Castilla-Cortazar I, de Ita JR, Aguirre GA, Castorena-Torres F, Ortiz-Urbina J, García-Magariño M, de la Garza RG, Diaz Olachea C, Elizondo Leal MI. Fanconi Anemia and Laron Syndrome. Am J Med Sci 2017; 353:425-432. [PMID: 28502327 DOI: 10.1016/j.amjms.2017.02.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 02/02/2017] [Accepted: 02/02/2017] [Indexed: 12/14/2022]
Abstract
BACKGROUND Fanconi anemia (FA) is a condition characterized by genetic instability and short stature, which is due to growth hormone (GH) deficiency in most cases. However, no apparent relationships have been identified between FA complementation group genes and GH. In this study, we thereby considered an association between FA and Laron syndrome (LS) (insulin-like growth factor 1 [IGF-1] deficiency). METHODS A 21-year-old female Mexican patient with a genetic diagnosis of FA was referred to our research department for an evaluation of her short stature. Upon admission to our facility, her phenotype led to a suspicion of LS; accordingly, serum levels of IGF-1 and IGF binding protein 3 were analyzed and a GH stimulation test was performed. In addition, we used a next-generation sequencing approach for a molecular evaluation of FA disease-causing mutations and genes involved in the GH-IGF signaling pathway. RESULTS Tests revealed low levels of IGF-1 and IGF binding protein 3 that remained within normal ranges, as well as a lack of response to GH stimulation. Sequencing confirmed a defect in the GH receptor signaling pathway. CONCLUSIONS To the best of our knowledge, this study is the first to suggest an association between FA and LS. We propose that IGF-1 administration might improve some FA complications and functions based upon IGF-1 beneficial actions observed in animal, cell and indirect clinical models: erythropoiesis modulation, immune function improvement and metabolic regulation.
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Affiliation(s)
- Inma Castilla-Cortazar
- Escuela de Medicina, Tecnologico de Monterrey, Monterrey, Nuevo Leon, Mexico; Fundación de Investigación HM Hospitales, Madrid, Spain.
| | | | | | | | - Jesús Ortiz-Urbina
- Escuela de Medicina, Tecnologico de Monterrey, Monterrey, Nuevo Leon, Mexico
| | | | | | - Carlos Diaz Olachea
- Escuela de Medicina, Tecnologico de Monterrey, Monterrey, Nuevo Leon, Mexico
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27
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Ebens CL, MacMillan ML, Wagner JE. Hematopoietic cell transplantation in Fanconi anemia: current evidence, challenges and recommendations. Expert Rev Hematol 2017; 10:81-97. [PMID: 27929686 PMCID: PMC6089510 DOI: 10.1080/17474086.2016.1268048] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Hematopoietic cell transplantation for Fanconi Anemia (FA) has improved dramatically over the past 40 years. With an enhanced understanding of the intrinsic DNA-repair defect and pathophysiology of hematopoietic failure and leukemogenesis, sequential changes to conditioning and graft engineering have significantly improved the expectation of survival after allogeneic hematopoietic cell transplantation (alloHCT) with incidence of graft failure decreased from 35% to <10% and acute graft-versus-host disease (GVHD) from >40% to <10%. Today, five-year overall survival exceeds 90% in younger FA patients with bone marrow failure but remains about 50% in those with hematologic malignancy. Areas covered: We review the evolution of alloHCT contributing to decreased rates of transplant related complications; highlight current challenges including poorer outcomes in cases of clonal hematologic disorders, alloHCT impact on endocrine function and intrinsic FA risk of epithelial malignancies; and describe investigational therapies for prevention and treatment of the hematologic manifestations of FA. Expert commentary: Current methods allow for excellent survival following alloHCT for FA associated BMF irrespective of donor hematopoietic cell source. Alternative curative approaches, such as gene therapy, are being explored to eliminate the risks of GVHD and minimize therapy-related adverse effects.
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Affiliation(s)
- Christen L Ebens
- a Division of Pediatric Blood and Marrow Transplantation, Department of Pediatrics , University of Minnesota Medical School , Minneapolis , MN , USA
| | - Margaret L MacMillan
- a Division of Pediatric Blood and Marrow Transplantation, Department of Pediatrics , University of Minnesota Medical School , Minneapolis , MN , USA
| | - John E Wagner
- a Division of Pediatric Blood and Marrow Transplantation, Department of Pediatrics , University of Minnesota Medical School , Minneapolis , MN , USA
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28
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Affiliation(s)
- Dipika Mohanty
- Department of Hematology & Lab Services, Apollo Hospitals, Bhubaneswar 751 005, Odisha, India
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29
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Fanconi Anemia Proteins Function in Mitophagy and Immunity. Cell 2016; 165:867-81. [PMID: 27133164 DOI: 10.1016/j.cell.2016.04.006] [Citation(s) in RCA: 186] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 01/29/2016] [Accepted: 03/24/2016] [Indexed: 01/09/2023]
Abstract
Fanconi anemia (FA) pathway genes are important tumor suppressors whose best-characterized function is repair of damaged nuclear DNA. Here, we describe an essential role for FA genes in two forms of selective autophagy. Genetic deletion of Fancc blocks the autophagic clearance of viruses (virophagy) and increases susceptibility to lethal viral encephalitis. Fanconi anemia complementation group C (FANCC) protein interacts with Parkin, is required in vitro and in vivo for clearance of damaged mitochondria, and decreases mitochondrial reactive oxygen species (ROS) production and inflammasome activation. The mitophagy function of FANCC is genetically distinct from its role in genomic DNA damage repair. Moreover, additional genes in the FA pathway, including FANCA, FANCF, FANCL, FANCD2, BRCA1, and BRCA2, are required for mitophagy. Thus, members of the FA pathway represent a previously undescribed class of selective autophagy genes that function in immunity and organellar homeostasis. These findings have implications for understanding the pathogenesis of FA and cancers associated with mutations in FA genes.
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30
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Paustian L, Chao MM, Hanenberg H, Schindler D, Neitzel H, Kratz CP, Ebell W. Androgen therapy in Fanconi anemia: A retrospective analysis of 30 years in Germany. Pediatr Hematol Oncol 2016; 33:5-12. [PMID: 26900943 DOI: 10.3109/08880018.2015.1129567] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
A substantial number of individuals with Fanconi anemia (FA) develop bone marrow failure and are treated with androgen therapy in order to increase blood counts. The authors retrospectively identified 70 patients who received androgen therapy any time between July 1976 and September 2014. Among these patients, 37 had medical records for analysis. Twenty-five of the 37 (68%) patients had response in hemoglobin level (n = 25), platelet count (n = 21), and/or absolute neutrophil count (n = 13). The median rise in hemoglobin was 6.5 mg/dL, platelet count 70,000/mm(3), and absolute neutrophil count (ANC) 1530/μL. The majority of patients (n = 22) had a response in 2 or more blood parameters. Reasons for discontinuation of therapy included development of cytogenetic aberrations (n = 9), lack of response (n = 7), hepatic adenoma (n = 6), progression to myelodysplastic syndrome/acute myeloid leukemia (n = 3), stabilization of blood parameters (n = 3), resolution of cytopenia secondary to mosaicism (n = 1), virilization (n = 1), development of anogenital carcinoma (n = 1), inaccessibility of medication (n = 1), and unknown (n = 1). Four patients at last follow-up remain on androgen therapy. These results highlight that androgen therapy can significantly improve blood counts for many FA patients, but progression of underlying bone marrow disease and development of liver adenomas requires careful monitoring.
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Affiliation(s)
- Laura Paustian
- a Department of Pediatric Hematology Oncology , Hannover Medical School , Hannover , Germany
| | - Mwe Mwe Chao
- a Department of Pediatric Hematology Oncology , Hannover Medical School , Hannover , Germany
| | - Helmut Hanenberg
- b Department of Pediatrics III , University Children's Hospital Essen, University of Duisburg-Essen , Essen , Germany.,c Department of Otorhinolaryngology, Head and Neck Surgery , Heinrich Heine University , Düsseldorf , Germany
| | - Detlev Schindler
- d Department of Human Genetics , University of Würzburg , Würzburg , Germany
| | - Heidemarie Neitzel
- e Institute of Medical and Human Genetics , Charité University Medicine Berlin , Berlin , Germany
| | - Christian Peter Kratz
- a Department of Pediatric Hematology Oncology , Hannover Medical School , Hannover , Germany
| | - Wolfram Ebell
- f Department of Pediatric Oncology, Hematology, and Stem Cell Transplantation , Charité University Medicine Berlin , Berlin , Germany
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31
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Amarachintha S, Sertorio M, Wilson A, Li X, Pang Q. Fanconi Anemia Mesenchymal Stromal Cells-Derived Glycerophospholipids Skew Hematopoietic Stem Cell Differentiation Through Toll-Like Receptor Signaling. Stem Cells 2015; 33:3382-96. [PMID: 26212365 PMCID: PMC4618082 DOI: 10.1002/stem.2100] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 05/14/2015] [Accepted: 06/04/2015] [Indexed: 01/08/2023]
Abstract
Fanconi anemia (FA) patients develop bone marrow (BM) failure or leukemia. One standard care for these devastating complications is hematopoietic stem cell transplantation. We identified a group of mesenchymal stromal cells (MSCs)-derived metabolites, glycerophospholipids, and their endogenous inhibitor, 5-(tetradecyloxy)-2-furoic acid (TOFA), as regulators of donor hematopoietic stem and progenitor cells. We provided two pieces of evidence that TOFA could improve hematopoiesis-supporting function of FA MSCs: (a) limiting-dilution cobblestone area-forming cell assay revealed that TOFA significantly increased cobblestone colonies in Fanca-/- or Fancd2-/- cocultures compared to untreated cocultures. (b) Competitive repopulating assay using output cells collected from cocultures showed that TOFA greatly alleviated the abnormal expansion of the donor myeloid (CD45.2+Gr1+Mac1+) compartment in both peripheral blood and BM of recipient mice transplanted with cells from Fanca-/- or Fancd2-/- cocultures. Furthermore, mechanistic studies identified Tlr4 signaling as the responsible pathway mediating the effect of glycerophospholipids. Thus, targeting glycerophospholipid biosynthesis in FA MSCs could be a therapeutic strategy to improve hematopoiesis and stem cell transplantation.
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Affiliation(s)
- Surya Amarachintha
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Mathieu Sertorio
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Andrew Wilson
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Xiaoli Li
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
| | - Qishen Pang
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229, USA
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32
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Garbati MR, Hays LE, Rathbun RK, Jillette N, Chin K, Al-Dhalimy M, Agarwal A, Newell AEH, Olson SB, Bagby GC. Cytokine overproduction and crosslinker hypersensitivity are unlinked in Fanconi anemia macrophages. J Leukoc Biol 2015; 99:455-65. [PMID: 26432900 DOI: 10.1189/jlb.3a0515-201r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 09/15/2015] [Indexed: 01/13/2023] Open
Abstract
The Fanconi anemia proteins participate in a canonical pathway that repairs cross-linking agent-induced DNA damage. Cells with inactivated Fanconi anemia genes are universally hypersensitive to such agents. Fanconi anemia-deficient hematopoietic stem cells are also hypersensitive to inflammatory cytokines, and, as importantly, Fanconi anemia macrophages overproduce such cytokines in response to TLR4 and TLR7/8 agonists. We questioned whether TLR-induced DNA damage is the primary cause of aberrantly regulated cytokine production in Fanconi anemia macrophages by quantifying TLR agonist-induced TNF-α production, DNA strand breaks, crosslinker-induced chromosomal breakage, and Fanconi anemia core complex function in Fanconi anemia complementation group C-deficient human and murine macrophages. Although both M1 and M2 polarized Fanconi anemia cells were predictably hypersensitive to mitomycin C, only M1 macrophages overproduced TNF-α in response to TLR-activating signals. DNA damaging agents alone did not induce TNF-α production in the absence of TLR agonists in wild-type or Fanconi anemia macrophages, and mitomycin C did not enhance TLR responses in either normal or Fanconi anemia cells. TLR4 and TLR7/8 activation induced cytokine overproduction in Fanconi anemia macrophages. Also, although TLR4 activation was associated with induced double strand breaks, TLR7/8 activation was not. That DNA strand breaks and chromosome breaks are neither necessary nor sufficient to account for the overproduction of inflammatory cytokines by Fanconi anemia cells suggests that noncanonical anti-inflammatory functions of Fanconi anemia complementation group C contribute to the aberrant macrophage phenotype and suggests that suppression of macrophage/TLR hyperreactivity might prevent cytokine-induced stem cell attrition in Fanconi anemia.
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Affiliation(s)
- Michael R Garbati
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Laura E Hays
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - R Keaney Rathbun
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Nathaniel Jillette
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Kathy Chin
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Muhsen Al-Dhalimy
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Anupriya Agarwal
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Amy E Hanlon Newell
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Susan B Olson
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
| | - Grover C Bagby
- *Northwest Veterans Affairs Cancer Research Center, Portland, Oregon, USA; Oregon Health & Science University, Portland, Oregon, USA; and Knight Cancer Institute, Oregon Health & Science University, Portland, Oregon, USA
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33
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Abstract
Fanconi anemia (FA) is an inherited bone marrow failure syndrome characterized by congenital abnormalities and chromosomal breakages with the occurrence of hematological and solid malignancies. FA is the most common type of inherited bone marrow failure and poses tremendous challenges. FA patients are uniquely hypersensitive to hematopoietic stem cell transplantation (HSCT) conditioning agents due to the underling chromosomal instability. HSCT has shown important progress in the last years, especially after the introduction of fludarabine and the reduction of cyclophosphamide in the preparative regimen. For patients with HLA-identical-related donors HSCT should be performed as first-line therapy, for patients with alternative donors HSCT remains a therapy with increased morbidity and mortality.
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34
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Mantelli M, Avanzini MA, Rosti V, Ingo DM, Conforti A, Novara F, Arrigo G, Boni M, Zappatore R, Lenta E, Moretta A, Acquafredda G, de Silvestri A, Cirillo V, Cicchetti E, Algeri M, Strocchio L, Vinti L, Starc N, Biagini S, Sirleto P, Bernasconi P, Zuffardi O, Maserati E, Maccario R, Zecca M, Locatelli F, Bernardo ME. Comprehensive characterization of mesenchymal stromal cells from patients with Fanconi anaemia. Br J Haematol 2015; 170:826-36. [PMID: 26010568 DOI: 10.1111/bjh.13504] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 04/16/2015] [Indexed: 11/28/2022]
Abstract
Fanconi anaemia (FA) is an inherited disorder characterized by pancytopenia, congenital malformations and a predisposition to develop malignancies. Alterations in the haematopoietic microenvironment of FA patients have been reported, but little is known regarding the components of their bone marrow (BM) stroma. We characterized mesenchymal stromal cells (MSCs) isolated from BM of 18 FA patients both before and after allogeneic haematopoietic stem cell transplantation (HSCT). Morphology, fibroblast colony-forming unit (CFU-F) ability, proliferative capacity, immunophenotype, differentiation potential, ability to support long-term haematopoiesis and immunomodulatory properties of FA-MSCs were analysed and compared with those of MSCs expanded from 15 age-matched healthy donors (HD-MSCs). FA-MSCs were genetically characterized through conventional karyotyping, diepoxybutane-test and array-comparative genomic hybridization. FA-MSCs generated before and after HSCT were compared. Morphology, immunophenotype, differentiation potential, ability in vitro to inhibit mitogen-induced T-cell proliferation and to support long-term haematopoiesis did not differ between FA-MSCs and HD-MSCs. CFU-F ability and proliferative capacity of FA-MSCs isolated after HSCT were significantly lower than those of HD-MSCs. FA-MSCs reached senescence significantly earlier than HD-MSCs and showed spontaneous chromosome fragility. Our findings indicate that FA-MSCs are defective in their ability to survive in vitro and display spontaneous chromosome breakages; whether these defects are involved in pathophysiology of BM failure syndromes deserves further investigation.
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Affiliation(s)
- Melissa Mantelli
- Immunology and Transplantation Laboratory/Cell Factory/Paediatric Haematology/Oncology, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Maria Antonia Avanzini
- Immunology and Transplantation Laboratory/Cell Factory/Paediatric Haematology/Oncology, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Vittorio Rosti
- Centre for the Study and Treatment of Myelofibrosis, Research Laboratories of Biotechnology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Daniela M Ingo
- Immunology and Transplantation Laboratory/Cell Factory/Paediatric Haematology/Oncology, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Antonella Conforti
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Francesca Novara
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Giulia Arrigo
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Marina Boni
- Laboratory of Cytogenetic and Molecular Onco-haematology, Haematology Department, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Rita Zappatore
- Laboratory of Cytogenetic and Molecular Onco-haematology, Haematology Department, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Elisa Lenta
- Immunology and Transplantation Laboratory/Cell Factory/Paediatric Haematology/Oncology, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Antonia Moretta
- Immunology and Transplantation Laboratory/Cell Factory/Paediatric Haematology/Oncology, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Gloria Acquafredda
- Immunology and Transplantation Laboratory/Cell Factory/Paediatric Haematology/Oncology, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Annalisa de Silvestri
- Clinical Epidemiology and Biometrics Unit, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Valentina Cirillo
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Elisa Cicchetti
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Mattia Algeri
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy.,University of Pavia, Pavia, Italy
| | - Luisa Strocchio
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Luciana Vinti
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Nadia Starc
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Simone Biagini
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Pietro Sirleto
- Cytogenetics and Molecular Genetics Unit, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
| | - Paolo Bernasconi
- Laboratory of Cytogenetic and Molecular Onco-haematology, Haematology Department, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Orsetta Zuffardi
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Emanuela Maserati
- Clinical and Experimental Medicine Department, University of Insubria, Varese, Italy
| | - Rita Maccario
- Immunology and Transplantation Laboratory/Cell Factory/Paediatric Haematology/Oncology, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Marco Zecca
- Immunology and Transplantation Laboratory/Cell Factory/Paediatric Haematology/Oncology, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy
| | - Franco Locatelli
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy.,University of Pavia, Pavia, Italy
| | - Maria Ester Bernardo
- Department of Paediatric Haematology/Oncology, IRCCS Bambino Gesù Children's Hospital, Rome, Italy
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35
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Chen X, Bosques L, Sung P, Kupfer GM. A novel role for non-ubiquitinated FANCD2 in response to hydroxyurea-induced DNA damage. Oncogene 2015; 35:22-34. [PMID: 25893307 DOI: 10.1038/onc.2015.68] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Revised: 01/30/2015] [Accepted: 02/02/2015] [Indexed: 12/20/2022]
Abstract
Fanconi anemia (FA) is a genetic disease of bone marrow failure, cancer susceptibility, and sensitivity to DNA crosslinking agents. FANCD2, the central protein of the FA pathway, is monoubiquitinated upon DNA damage, such as crosslinkers and replication blockers such as hydroxyurea (HU). Even though FA cells demonstrate unequivocal sensitivity to crosslinkers, such as mitomycin C (MMC), we find that they are largely resistant to HU, except for cells absent for expression of FANCD2. FANCD2, RAD51 and RAD18 form a complex, which is enhanced upon HU exposure. Surprisingly, although FANCD2 is required for this enhanced interaction, its monoubiquitination is not. Similarly, non-ubiquitinated FANCD2 can still support proliferation cell nuclear antigen (PCNA) monoubiquitination. RAD51, but not BRCA2, is also required for PCNA monoubiquitination in response to HU, suggesting that this function is independent of homologous recombination (HR). We further show that translesion (TLS) polymerase PolH chromatin localization is decreased in FANCD2 deficient cells, FANCD2 siRNA knockdown cells and RAD51 siRNA knockdown cells, and PolH knockdown results in HU sensitivity only. Our data suggest that FANCD2 and RAD51 have an important role in PCNA monoubiquitination and TLS in a FANCD2 monoubiquitination and HR-independent manner in response to HU. This effect is not observed with MMC treatment, suggesting a non-canonical function for the FA pathway in response to different types of DNA damage.
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Affiliation(s)
- X Chen
- Department of Pediatrics, Section of Hematology/Oncology, Yale Cancer Center, Yale School of Medicine, New Haven, CT, USA.,Department of Pathology, Section of Hematology/Oncology, Yale Cancer Center, Yale School of Medicine, New Haven, CT, USA
| | - L Bosques
- Department of Pediatrics, Section of Hematology/Oncology, Yale Cancer Center, Yale School of Medicine, New Haven, CT, USA.,Department of Pathology, Section of Hematology/Oncology, Yale Cancer Center, Yale School of Medicine, New Haven, CT, USA
| | - P Sung
- Department of Molecular, Cellular, and Developmental Biology, Yale Cancer Center, Yale School of Medicine, New Haven, CT, USA
| | - G M Kupfer
- Department of Pediatrics, Section of Hematology/Oncology, Yale Cancer Center, Yale School of Medicine, New Haven, CT, USA.,Department of Pathology, Section of Hematology/Oncology, Yale Cancer Center, Yale School of Medicine, New Haven, CT, USA
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36
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Li Y, Xing W, He YZ, Chen S, Rhodes SD, Yuan J, Zhou Y, Shi J, Bai J, Zhang FK, Yuan WP, Cheng T, Xu MJ, Yang FC. Interleukin 8/KC enhances G-CSF induced hematopoietic stem/progenitor cell mobilization in Fancg deficient mice. Stem Cell Investig 2014; 1:19. [PMID: 27358865 DOI: 10.3978/j.issn.2306-9759.2014.10.02] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 10/19/2014] [Indexed: 01/21/2023]
Abstract
BACKGROUND Fanconi anemia (FA) is a heterogeneous genetic disorder characterized by a progressive bone marrow aplasia, chromosomal instability, and acquisition of malignancies. Successful hematopoietic cell transplantation (HCT) for FA patients is challenging due to hypersensitivity to DNA alkylating agents and irradiation of FA patients. Early mobilization of autologous stem cells from the bone marrow has been thought to be ideal prior to the onset of bone marrow failure, which often occurs during childhood. However, the markedly decreased response of FA hematopoietic stem cells to granulocyte colony-stimulating factor (G-CSF) is circumventive of this autologous HCT approach. To-date, the mechanism for defective stem cell mobilization in G-CSF treated FA patients remains unclear. METHODS Fancg heterozygous (Fancg (+/-)) mice utilized in these studies. Student's t-test and one-way ANOVA were used to evaluate statistical differences between WT and Fancg (-/-) cells. Statistical significance was defined as P values less than 0.05. RESULTS Fancg deficient (Fancg (-/-)) mesenchymal stem/progenitor cells (MSPCs) produce significant lower levels of KC, an interleukin-8 (IL-8) related chemoattractant protein in rodents, as compared to wild type cells. Combinatorial administration of KC and G-CSF significantly increased the mobilization of hematopoietic stem/progenitor cells (HSPCs) in Fancg (-/-) mice. CONCLUSIONS In summary, our results suggest that KC/IL-8 could be proved useful in the synergistic mobilization of FA HSPCs in combination with G-CSF.
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Affiliation(s)
- Yan Li
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Wen Xing
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Yong-Zheng He
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Shi Chen
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Steven D Rhodes
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Jin Yuan
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Yuan Zhou
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Jun Shi
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Jie Bai
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Feng-Kui Zhang
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Wei-Ping Yuan
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Tao Cheng
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Ming-Jiang Xu
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Feng-Chun Yang
- 1 Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA ; 2 State Key Laboratory of Experimental Hematology, Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300020, China ; 3 Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
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Factors Affecting the Outcome of Related Allogeneic Hematopoietic Cell Transplantation in Patients with Fanconi Anemia. Biol Blood Marrow Transplant 2014; 20:1599-603. [DOI: 10.1016/j.bbmt.2014.06.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 06/11/2014] [Indexed: 12/20/2022]
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Abstract
Fanconi anemia (FA) represents a paradigm of rare genetic diseases, where the quest for cause and cure has led to seminal discoveries in cancer biology. Although a total of 16 FA genes have been identified thus far, the biochemical function of many of the FA proteins remains to be elucidated. FA is rare, yet the fact that 5 FA genes are in fact familial breast cancer genes and FA gene mutations are found frequently in sporadic cancers suggest wider applicability in hematopoiesis and oncology. Establishing the interaction network involving the FA proteins and their associated partners has revealed an intersection of FA with several DNA repair pathways, including homologous recombination, DNA mismatch repair, nucleotide excision repair, and translesion DNA synthesis. Importantly, recent studies have shown a major involvement of the FA pathway in the tolerance of reactive aldehydes. Moreover, despite improved outcomes in stem cell transplantation in the treatment of FA, many challenges remain in patient care.
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Panneerselvam J, Pickering A, Zhang J, Wang H, Tian H, Zheng J, Fei P. A hidden role of the inactivated FANCD2: upregulating ΔNp63. Oncotarget 2014; 4:1416-26. [PMID: 23965832 PMCID: PMC3824532 DOI: 10.18632/oncotarget.1217] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
A compromised Fanconi Anemia (FA) signaling pathway, often resulting from an inactivated FANCD2, was recently recognized to contribute to the development of non-FA human tumors. However, it is largely unknown as to how an impaired FA pathway or an inactivated FANCD2 promotes tumorigenesis. Here we unexpectedly found that ΔNp63 mRNA was expressed at high levels in human cancer cells carrying an impaired FA pathway compared to the corresponding control cells carrying an intact FA pathway. This observation was recapitulated upon conditionally managing the status of FANCD2 monoubiquitination /activation in 293T cells. Importantly, ΔNp63 elevation upon FANCD2 inactivation was confirmed in human fibroblasts derived from FA patients. Moreover, we have identified a 189 bp DNA fragment downstream of the ΔNp63 promoter (P2) that can mediate the upregulation of ΔNp63 by an inactivated FANCD2, and determined that elevated ΔNp63 is high enough to promote cancer cell proliferation and metastasis. In vivo, the elevation of FAVL, a tumor promotion factor that inhibits FANCD2 activation, was found to be positively associated with ΔNp63 expression in human cancer tissues. Collectively, these results document a novel role of an inactivated FANCD2 in upregulating ΔNp63, advancing our understanding of how an impaired FA pathway contributes to the pathogenesis of human cancer.
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Zhao L, Li Y, He M, Song Z, Lin S, Yu Z, Bai X, Wang E, Wei M. The Fanconi anemia pathway sensitizes to DNA alkylating agents by inducing JNK-p53-dependent mitochondrial apoptosis in breast cancer cells. Int J Oncol 2014; 45:129-38. [PMID: 24789349 DOI: 10.3892/ijo.2014.2400] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 03/14/2014] [Indexed: 11/05/2022] Open
Abstract
The Fanconi anemia/BRCA (FA/BRCA) DNA damage repair pathway plays a pivotal role in the cellular response to DNA alkylating agents and greatly influences drug response in cancer treatment. However, the molecular mechanisms underlying the FA/BRCA pathway reversed resistance have received limited attention. In the present study, we investigated the effect of Fanconi anemia complementation group F protein (FANCF), a critical factor of the FA/BRCA pathway, on cancer cell apoptosis induced by DNA alkylating agents such as mitomycin c (MMC). We found that FANCF shRNA potentiated MMC-induced cytotoxicity and apoptosis in MCF-7 and MDA-MB-231 breast cancer cells. At a mechanistic level, FANCF shRNA downregulated the anti-apoptotic protein Bcl-2 and upregulated the pro-apoptotic protein Bax, accompanied by release of cyt-c and smac into the cytosol in MMC-treated cells. Furthermore, activation of caspase-3 and -9, other than caspase-8, cleavage of poly(ADP ribose) polymerase (PARP), and a decrease of mitochondrial membrane potential (MMP) indicated that involvement of the mitochondrial apoptotic pathway in FANCF silencing of MMC-treated breast cancer cells. A decrease in IAP family proteins XIAP and survivin were also observed following FANCF silencing in MMC-treated breast cancer cells. Notably, FANCF shRNA was able to increase p53 levels through activation of the JNK pathway in MMC-treated breast cancer cells. Furthermore, p53 inhibition using pifithrin-α abolished the induction of caspase-3 and PARP by FANCF shRNA and MMC, indicating that MMC-induced apoptosis is substantially enhanced by FANCF shRNA via p53-dependent mechanisms. To our knowledge, we provide new evidence for the potential application of FANCF as a chemosensitizer in breast cancer therapy.
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Affiliation(s)
- Lin Zhao
- Department of Pharmacology, School of Pharmaceutical Science, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
| | - Yanlin Li
- Department of Pharmacology, School of Pharmaceutical Science, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
| | - Miao He
- Department of Pharmacology, School of Pharmaceutical Science, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
| | - Zhiguo Song
- Department of Pharmacology, School of Pharmaceutical Science, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
| | - Shu Lin
- Department of Pharmacology, School of Pharmaceutical Science, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
| | - Zhaojin Yu
- Department of Pharmacology, School of Pharmaceutical Science, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
| | - Xuefeng Bai
- Department of Pharmacology, School of Pharmaceutical Science, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
| | - Enhua Wang
- Institute of Pathology and Pathophysiology, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
| | - Minjie Wei
- Department of Pharmacology, School of Pharmaceutical Science, China Medical University, Heping Ward, Shenyang, Liaoning 110001, P.R. China
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Paiva RMA, Calado RT. Telomere dysfunction and hematologic disorders. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2014; 125:133-57. [PMID: 24993701 DOI: 10.1016/b978-0-12-397898-1.00006-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Aplastic anemia is a disease in which the hematopoietic stem cell fails to adequately produce peripheral blood cells, causing pancytopenia. In some cases of acquired aplastic anemia and in inherited type of aplastic anemia, dyskeratosis congenita, telomere biology gene mutations and telomere shortening are etiologic. Telomere erosion hampers the ability of hematopoietic stem and progenitor cells to adequately replicate, clinically resulting in bone marrow failure. Additionally, telomerase mutations and short telomeres are genetic risk factors for the development of some hematologic cancers, including myelodysplastic syndrome, acute myeloid leukemia, and chronic lymphocytic leukemia.
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Affiliation(s)
- Raquel M A Paiva
- Department of Internal Medicine, University of São Paulo at Ribeirão Preto School of Medicine, Ribeirão Preto, São Paulo, Brazil
| | - Rodrigo T Calado
- Department of Internal Medicine, University of São Paulo at Ribeirão Preto School of Medicine, Ribeirão Preto, São Paulo, Brazil
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Abstract
Molecular pathogenesis may be elucidated for inherited bone marrow failure syndromes (IBMFS). The study and presentation of the details of their molecular biology and biochemistry is warranted for appropriate diagnosis and management of afflicted patients and to identify the physiology of the normal hematopoiesis and mechanisms of carcinogenesis. Several themes have emerged within each subsection of IBMFS, including the ribosomopathies, which include ribosome assembly and ribosomal RNA processing. The Fanconi anemia pathway has become interdigitated with the familial breast cancer syndromes. In this article, the diseases that account for most IBMFS diagnoses are analyzed.
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Affiliation(s)
- S Deborah Chirnomas
- Section of Pediatric Hematology-Oncology, LMP 2073, Yale School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA
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Huang J, Liu S, Bellani MA, Thazhathveetil AK, Ling C, de Winter JP, Wang Y, Wang W, Seidman MM. The DNA translocase FANCM/MHF promotes replication traverse of DNA interstrand crosslinks. Mol Cell 2013; 52:434-46. [PMID: 24207054 DOI: 10.1016/j.molcel.2013.09.021] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 09/09/2013] [Accepted: 09/19/2013] [Indexed: 10/26/2022]
Abstract
The replicative machinery encounters many impediments, some of which can be overcome by lesion bypass or replication restart pathways, leaving repair for a later time. However, interstrand crosslinks (ICLs), which preclude DNA unwinding, are considered absolute blocks to replication. Current models suggest that fork collisions, either from one or both sides of an ICL, initiate repair processes required for resumption of replication. To test these proposals, we developed a single-molecule technique for visualizing encounters of replication forks with ICLs as they occur in living cells. Surprisingly, the most frequent patterns were consistent with replication traverse of an ICL, without lesion repair. The traverse frequency was strongly reduced by inactivation of the translocase and DNA binding activities of the FANCM/MHF complex. The results indicate that translocase-based mechanisms enable DNA synthesis to continue past ICLs and that these lesions are not always absolute blocks to replication.
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Affiliation(s)
- Jing Huang
- Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, 251 Bayview Boulevard, Baltimore, MD 21224, USA
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Yu J, Zhao L, Li Y, Li N, He M, Bai X, Yu Z, Zheng Z, Mi X, Wang E, Wei M. Silencing of fanconi anemia complementation group f exhibits potent chemosensitization of mitomycin C activity in breast cancer cells. J Breast Cancer 2013; 16:291-9. [PMID: 24155758 PMCID: PMC3800725 DOI: 10.4048/jbc.2013.16.3.291] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2012] [Accepted: 07/08/2013] [Indexed: 02/04/2023] Open
Abstract
PURPOSE Fanconi anemia complementation group F (FANCF) is a key factor to maintaining the function of Fanconi anaemia/BRCA (FA/BRCA) pathway, a DNA-damage response pathway. However, the functional role of FANCF in breast cancer has not been elucidated. In the present study, we evaluated the chemosensitization effect of FANCF in breast cancer cells. METHODS We performed specific knockdown of the endogenous FANCF in breast cancer cells by transfecting the cells with an FANCF short hairpin RNA (shRNA) vector. Cell viability was measured with a Cell Counting Kit-8, and DNA damage was assessed with the alkaline comet assay. The apoptosis, cell cycle, and drug accumulation were measured by flow cytometric analysis. Protein expression levels were determined by Western blot analysis, using specific antibodies. RESULTS The analyses of two breast cancer cell lines (MCF-7 and MDA-MB-435S) demonstrated that the FANCF shRNA could effectively block the FA/BRCA pathway through the inhibition of Fanconi anemia complementation group D2 ubiquitination. Moreover, FANCF silencing potentiated the sensitivity of cells to mitomycin C (MMC), where combined FANCF shRNA/MMC treatment inhibited cell proliferation, induced S-phase arrest, apoptosis, and DNA fragmentation, and reduced the mitochondrial membrane potential, compared with MMC treatment alone. CONCLUSION Taken together, this study demonstrates that the inhibition of FANCF by its shRNA leads to a synergistic enhancement of MMC cytotoxicity in breast cancer cells. These results suggest that the inhibition of the FA/BRCA pathway is a useful adjunct to cytotoxic chemotherapy for the treatment of breast cancer.
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Affiliation(s)
- Jiankun Yu
- Department of Pharmacology, China Medical University, Shenyang, China
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Weiss CN, Ito K. DNA damage response, redox status and hematopoiesis. Blood Cells Mol Dis 2013; 52:12-8. [PMID: 24041596 DOI: 10.1016/j.bcmd.2013.08.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 08/06/2013] [Indexed: 12/15/2022]
Abstract
The ability of hematopoietic stem cells (HSCs) to self-renew and differentiate into progenitors is essential for homeostasis of the hematopoietic system. The longevity of HSCs makes them vulnerable to accumulating DNA damage, which may be leukemogenic or result in senescence and cell death. Additionally, the ability of HSCs to self-renew and differentiate allows DNA damage to spread throughout the hematologic system, leaving the organism vulnerable to disease. In this review we discuss cell fate decisions made in the face of DNA damage and other cellular stresses, and the role of reactive oxygen species in the long-term maintenance of HSCs and their DNA damage response.
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Affiliation(s)
- Cary N Weiss
- Ruth L. and David S. Gottesman Institute for Stem Cell and Regenerative Medicine Research, Departments of Cell Biology and Medicine, Albert Einstein Cancer Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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Pagano G, Talamanca AA, Castello G, d'Ischia M, Pallardó FV, Petrović S, Porto B, Tiano L, Zatterale A. Bone marrow cell transcripts from Fanconi anaemia patients reveal in vivo alterations in mitochondrial, redox and DNA repair pathways. Eur J Haematol 2013; 91:141-51. [PMID: 23646927 DOI: 10.1111/ejh.12131] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/29/2013] [Indexed: 12/14/2022]
Abstract
Fanconi anaemia (FA) is a genetic cancer predisposition disorder associated with cytogenetic instability, bone marrow failure and a pleiotropic cellular phenotype, including low thresholds of responses to oxidative stress, cross-linking agents and selected cytokines. This study was aimed at defining the scope of abnormalities in gene expression using the publicly available FA Transcriptome Consortium (FTC) database (Gene Expression Omnibus, 2009 and publicly available as GSE16334). We evaluated the data set that included transcriptomal analyses on RNA obtained from low-density bone marrow cells (BMC) from 20 patients with FA and 11 healthy volunteers, by seeking to identify changes in expression of over 22,000 genes, including a set of genes involved in: (i) bioenergetic pathways; (ii) antioxidant activities; (iii) response to stress and metal-chelating proteins; (iv) inflammation-related cytokines and (v) DNA repair. Ontological analysis of genes expressed at magnitudes of 1.5-fold or greater demonstrated significant suppression of genes in the categories of (i) energy metabolism; (ii) antioxidant activities; and (iii) stress and chelating proteins. Enhanced expression was found for 16 of 26 genes encoding inflammatory cytokines. A set of 20 of 21 transcripts for DNA repair activities were down-regulated; four of these transcripts related to type II topoisomerase. The data provide evidence for alterations in gene regulation of bioenergetic activities, redox-related activities, stress and metal-chelating proteins, and of some selected DNA repair activities in patients with FA.
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Affiliation(s)
- Giovanni Pagano
- Italian National Cancer Institute, G Pascale Foundation, CROM, Mercogliano, AV, Italy.
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Ayas M, Saber W, Davies SM, Harris RE, Hale GA, Socie G, LeRademacher J, Thakar M, Deeg HJJ, Al-Seraihy A, Battiwalla M, Camitta BM, Olsson R, Bajwa RS, Bonfim CM, Pasquini R, Macmillan ML, George B, Copelan EA, Wirk B, Al Jefri A, Fasth AL, Guinan EC, Horn BN, Lewis VA, Slavin S, Stepensky P, Bierings M, Gale RP. Allogeneic hematopoietic cell transplantation for fanconi anemia in patients with pretransplantation cytogenetic abnormalities, myelodysplastic syndrome, or acute leukemia. J Clin Oncol 2013; 31:1669-76. [PMID: 23547077 PMCID: PMC3635221 DOI: 10.1200/jco.2012.45.9719] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
PURPOSE Allogeneic hematopoietic cell transplantation (HCT) can cure bone marrow failure in patients with Fanconi anemia (FA). Data on outcomes in patients with pretransplantation cytogenetic abnormalities, myelodysplastic syndrome (MDS), or acute leukemia have not been separately analyzed. PATIENTS AND METHODS We analyzed data on 113 patients with FA with cytogenetic abnormalities (n = 54), MDS (n = 45), or acute leukemia (n = 14) who were reported to the Center for International Blood and Marrow Transplant Research from 1985 to 2007. RESULTS Neutrophil recovery occurred in 78% and 85% of patients at days 28 and 100, respectively. Day 100 cumulative incidences of acute graft-versus-host disease grades B to D and C to D were 26% (95% CI, 19% to 35%) and 12% (95% CI, 7% to 19%), respectively. Survival probabilities at 1, 3, and 5 years were 64% (95% CI, 55% to 73%), 58% (95% CI, 48% to 67%), and 55% (95% CI, 45% to 64%), respectively. In univariate analysis, younger age was associated with superior 5-year survival (≤ v > 14 years: 69% [95% CI, 57% to 80%] v 39% [95% CI, 26% to 53%], respectively; P = .001). In transplantations from HLA-matched related donors (n = 82), younger patients (≤ v > 14 years: 78% [95% CI, 64% to 90%] v 34% [95% CI, 20% to 50%], respectively; P < .001) and patients with cytogenetic abnormalities only versus MDS/acute leukemia (67% [95% CI, 52% to 81%] v 43% [95% CI, 27% to 59%], respectively; P = .03) had superior 5-year survival. CONCLUSION Our analysis indicates that long-term survival for patients with FA with cytogenetic abnormalities, MDS, or acute leukemia is achievable. Younger patients and recipients of HLA-matched related donor transplantations who have cytogenetic abnormalities only have the best survival.
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Affiliation(s)
- Mouhab Ayas
- King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.
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Zhang QS, Watanabe-Smith K, Schubert K, Major A, Sheehan AM, Marquez-Loza L, Newell AEH, Benedetti E, Joseph E, Olson S, Grompe M. Fancd2 and p21 function independently in maintaining the size of hematopoietic stem and progenitor cell pool in mice. Stem Cell Res 2013; 11:687-92. [PMID: 23721813 DOI: 10.1016/j.scr.2013.04.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 04/18/2013] [Accepted: 04/22/2013] [Indexed: 11/29/2022] Open
Abstract
Fanconi anemia patients suffer from progressive bone marrow failure. An overactive p53 response to DNA damage contributes to the progressive elimination of Fanconi anemia hematopoietic stem and progenitor cells (HSPC), and hence presents a potential target for therapeutic intervention. To investigate whether the cell cycle regulatory protein p21 is the primary mediator of the p53-dependent stem cell loss, p21/Fancd2 double-knockout mice were generated. Surprisingly double mutant mice displayed even more severe loss of HSPCs than Fancd2(-/-) single mutants. p21 deletion did not rescue the abnormal cell cycle profile and had no impact on the long-term repopulating potential of Fancd2(-/-) bone marrow cells. Collectively, our data indicate that p21 has an indispensable role in maintaining a normal HSPC pool and suggest that other p53-targeted factors, not p21, mediate the progressive elimination of HSPC in Fanconi anemia.
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Affiliation(s)
- Qing-Shuo Zhang
- Oregon Stem Cell Center, Department of Pediatrics, Oregon Health and Science University, Portland, OR 97239, USA.
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Singh S, Shemesh K, Liefshitz B, Kupiec M. Genetic and physical interactions between the yeast ELG1 gene and orthologs of the Fanconi anemia pathway. Cell Cycle 2013; 12:1625-36. [PMID: 23624835 PMCID: PMC3680542 DOI: 10.4161/cc.24756] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Fanconi anemia (FA) is a human syndrome characterized by genomic instability and increased incidence of cancer. FA is a genetically heterogeneous disease caused by mutations in at least 15 different genes; several of these genes are conserved in the yeast Saccharomyces cerevisiae. Elg1 is also a conserved protein that forms an RFC-like complex, which interacts with SUMOylated PCNA. The mammalian Elg1 protein has been recently found to interact with the FA complex. Here we analyze the genetic interactions between elg1Δand mutants of the yeast FA-like pathway. We show that Elg1 physically contacts the Mhf1/Mhf2 histone-like complex and genetically interacts with MPH1 (ortholog of the FANCM helicase) and CHL1 (ortholog of the FANCJ helicase) genes. We analyze the sensitivity of double, triple, quadruple and quintuple mutants to methylmethane sulfonate (MMS) and to hydroxyurea (HU). Our results show that genetic interactions depend on the type of DNA damaging agent used and show a hierarchy: Chl1 and Elg1 play major roles in the survival to these genotoxins and exhibit synthetic fitness reduction. Mph1 plays a lesser role, and the effect of the Mhf1/2 complex is seen only in the absence of Elg1 on HU-containing medium. Finally, we dissect the relationship between yeast FA-like mutants and the replication clamp, PCNA. Our results point to an intricate network of interactions rather than a single, linear repair pathway.
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Affiliation(s)
- Shivani Singh
- Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Tel Aviv, Israel
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