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Yamaguchi M, Sera Y, Toga-Yamaguchi H, Kanegane H, Iguchi Y, Fujimura K. Knockdown of the Shwachman-Diamond syndrome gene, SBDS, induces galectin-1 expression and impairs cell growth. Int J Hematol 2024; 119:383-391. [PMID: 38240987 DOI: 10.1007/s12185-024-03709-z] [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: 06/22/2023] [Revised: 12/18/2023] [Accepted: 01/05/2024] [Indexed: 03/24/2024]
Abstract
Shwachman-Diamond syndrome (SDS) is an autosomal recessive disorder characterized by exocrine pancreatic insufficiency and bone marrow failure. The depletion of SBDS protein by RNA interference has been shown to cause inhibition of cell proliferation in several cell lines. However, the precise mechanism by which the loss of SBDS leads to inhibition of cell growth remains unknown. To evaluate the impaired growth of SBDS-knockdown cells, we analyzed Epstein-Barr virus-transformed lymphoblast cells (LCLs) derived from two patients with SDS (c. 183_184TA > CT and c. 258 + 2 T > C). After 3 days of culture, the growth of LCL-SDS cell lines was considerably less than that of control donor cells. By annealing control primer-based GeneFishing PCR screening, we found that galectin-1 (Gal-1) mRNA expression was elevated in LCL-SDS cells. Western blot analysis showed that the level of Gal-1 protein expression was also increased in LCL-SDS cells as well as in SBDS-knockdown 32Dcl3 murine myeloid cells. We confirmed that recombinant Gal-1 inhibited the proliferation of both LCL-control and LCL-SDS cells and induced apoptosis (as determined by annexin V-positive staining). These results suggest that the overexpression of Gal-1 contributes to abnormal cell growth in SBDS-deficient cells.
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Affiliation(s)
- Masafumi Yamaguchi
- Laboratory of Physiological Chemistry, Hiroshima International University, 5-1-1 Hirokoshingai, Kure-Shi, Hiroshima, 737-0112, Japan.
| | - Yukihiro Sera
- Laboratory of Physiological Chemistry, Hiroshima International University, 5-1-1 Hirokoshingai, Kure-Shi, Hiroshima, 737-0112, Japan
| | - Hanae Toga-Yamaguchi
- Laboratory of Physiological Chemistry, Hiroshima International University, 5-1-1 Hirokoshingai, Kure-Shi, Hiroshima, 737-0112, Japan
| | - Hirokazu Kanegane
- Department of Child Health and Development, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, BUnkyo-ku, Tokyo, 113-8519, Japan
| | - Yusuke Iguchi
- Laboratory of Physiological Chemistry, Hiroshima International University, 5-1-1 Hirokoshingai, Kure-Shi, Hiroshima, 737-0112, Japan
| | - Kingo Fujimura
- Department of Nursing, Yasuda Women's University, 6-13-1 Yasuhigashi, Asaminami-ku, Hiroshima, 731-0153, Japan
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Cipolli M, Boni C, Penzo M, Villa I, Bolamperti S, Baldisseri E, Frattini A, Porta G, Api M, Selicato N, Roccia P, Pollutri D, Busilacchi EM, Poloni A, Caporelli N, D’Amico G, Pegoraro A, Cesaro S, Oyarbide U, Vella A, Lippi G, Corey SJ, Valli R, Polini A, Bezzerri V. Ataluren improves myelopoiesis and neutrophil chemotaxis by restoring ribosome biogenesis and reducing p53 levels in Shwachman-Diamond syndrome cells. Br J Haematol 2024; 204:292-305. [PMID: 37876306 PMCID: PMC10843527 DOI: 10.1111/bjh.19134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 09/18/2023] [Accepted: 09/20/2023] [Indexed: 10/26/2023]
Abstract
Shwachman-Diamond syndrome (SDS) is characterized by neutropenia, exocrine pancreatic insufficiency and skeletal abnormalities. SDS bone marrow haematopoietic progenitors show increased apoptosis and impairment in granulocytic differentiation. Loss of Shwachman-Bodian-Diamond syndrome (SBDS) expression results in reduced eukaryotic 80S ribosome maturation. Biallelic mutations in the SBDS gene are found in ~90% of SDS patients, ~55% of whom carry the c.183-184TA>CT nonsense mutation. Several translational readthrough-inducing drugs aimed at suppressing nonsense mutations have been developed. One of these, ataluren, has received approval in Europe for the treatment of Duchenne muscular dystrophy. We previously showed that ataluren can restore full-length SBDS protein synthesis in SDS-derived bone marrow cells. Here, we extend our preclinical study to assess the functional restoration of SBDS capabilities in vitro and ex vivo. Ataluren improved 80S ribosome assembly and total protein synthesis in SDS-derived cells, restored myelopoiesis in myeloid progenitors, improved neutrophil chemotaxis in vitro and reduced neutrophil dysplastic markers ex vivo. Ataluren also restored full-length SBDS synthesis in primary osteoblasts, suggesting that its beneficial role may go beyond the myeloid compartment. Altogether, our results strengthened the rationale for a Phase I/II clinical trial of ataluren in SDS patients who harbour the nonsense mutation.
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Affiliation(s)
- Marco Cipolli
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Christian Boni
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Marianna Penzo
- Department of Medical and Surgical Sciences (DIMEC) AND Center for Applied Biomedical Research (CRBA), Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Isabella Villa
- Institute of Endocrine and Metabolic Sciences, Endocrine and Osteometabolic Lab, IRCCS San Raffaele Hospital, Milano, Italy
| | - Simona Bolamperti
- Institute of Endocrine and Metabolic Sciences, Endocrine and Osteometabolic Lab, IRCCS San Raffaele Hospital, Milano, Italy
| | - Elena Baldisseri
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Annalisa Frattini
- Institute for Genetic and Biomedical Research (IRGB), UOS Milano CNR, Milano, Italy
- Department of Medicine and Surgery (DMC), Universita' degli Studi dell'Insubria, Varese, Italy
| | - Giovanni Porta
- Department of Medicine and Surgery (DMC), Universita' degli Studi dell'Insubria, Varese, Italy
| | - Martina Api
- Cystic Fibrosis Center, Azienda Ospedaliero Universitaria Ospedali Riuniti, Ancona, Italy
| | - Nora Selicato
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Pamela Roccia
- Department of Medicine and Surgery (DMC), Universita' degli Studi dell'Insubria, Varese, Italy
| | - Daniela Pollutri
- Department of Medical and Surgical Sciences (DIMEC) AND Center for Applied Biomedical Research (CRBA), Alma Mater Studiorum University of Bologna, Bologna, Italy
| | | | - Antonella Poloni
- Hematology Clinic, Università Politecnica delle Marche, AOU Ospedali Riuniti, Ancona, Italy
| | - Nicole Caporelli
- Cystic Fibrosis Center, Azienda Ospedaliero Universitaria Ospedali Riuniti, Ancona, Italy
| | - Giovanna D’Amico
- Centro Tettamanti, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
| | - Anna Pegoraro
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Simone Cesaro
- Pediatric Hematology Oncology, Ospedale Donna Bambino, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Usua Oyarbide
- Departments of Cancer Biology and Pediatric Hematology/Oncology and Stem Cell Transplantation, Cleveland Clinic, Cleveland, USA
| | - Antonio Vella
- Unit of Immunology, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Giuseppe Lippi
- Section of Clinical Biochemistry, Department of Engineering for Innovation Medicine, University of Verona, Verona, Italy
| | - Seth J Corey
- Departments of Cancer Biology and Pediatric Hematology/Oncology and Stem Cell Transplantation, Cleveland Clinic, Cleveland, USA
| | - Roberto Valli
- Department of Medicine and Surgery (DMC), Universita' degli Studi dell'Insubria, Varese, Italy
| | - Alessandro Polini
- Institute of Nanotechnology, National Research Council (CNR-NANOTEC), Lecce, Italy
| | - Valentino Bezzerri
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
- Section of Clinical Biochemistry, Department of Engineering for Innovation Medicine, University of Verona, Verona, Italy
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3
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Sera Y, Imanaka T, Yamaguchi M. M phase-specific interaction between SBDS and RNF2 at the mitotic spindles regulates mitotic progression. Biochem Biophys Res Commun 2023; 682:118-123. [PMID: 37806249 DOI: 10.1016/j.bbrc.2023.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 09/26/2023] [Accepted: 10/03/2023] [Indexed: 10/10/2023]
Abstract
Shwachman-Diamond syndrome (SDS) is an autosomal recessive inherited disorder caused by biallelic mutations in the Shwachman-Bodian-Diamond syndrome (SBDS) gene. SBDS protein is involved in ribosome biogenesis; therefore SDS is classified as a ribosomopathy. SBDS is localized at mitotic spindles and stabilizes microtubules. Previously, we showed that SBDS interacts with ring finger protein 2 (RNF2) and is degraded through RNF2-dependent ubiquitination. In this study, we investigated when and where SBDS interacts with RNF2 and the effects of the interaction on cells. We found that SBDS co-localized with RNF2 on centrosomal microtubules in the mitotic phase (M phase), whereas SBDS and RNF2 localized to the nucleolus and nucleoplasm in the interphase, respectively. The microtubule-binding assay revealed that SBDS interacted directly with microtubules and RNF2 interacted with SBDS bound to microtubules. In addition, SBDS was ubiquitinated and degraded by RNF2 during the M phase. Moreover, RNF2 overexpression accelerated mitotic progression. These findings suggest that SBDS delays mitotic progression, and RNF2 releases cells from suppression through the ubiquitination and subsequent degradation of SBDS. The interaction between SBDS and RNF2 at mitotic spindles might be involved in mitotic progression as a novel regulatory cascade.
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Affiliation(s)
- Yukihiro Sera
- Laboratory of Physiological Chemistry, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hirokoshinkai 5-1-1, Kure, 737-0112, Japan
| | - Tsuneo Imanaka
- Laboratory of Physiological Chemistry, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hirokoshinkai 5-1-1, Kure, 737-0112, Japan
| | - Masafumi Yamaguchi
- Laboratory of Physiological Chemistry, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hirokoshinkai 5-1-1, Kure, 737-0112, Japan.
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4
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SBDS interacts with RNF2 and is degraded through RNF2-dependent ubiquitination. Biochem Biophys Res Commun 2022; 598:119-123. [DOI: 10.1016/j.bbrc.2022.02.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 02/05/2022] [Indexed: 11/20/2022]
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In K, Zaini MA, Müller C, Warren AJ, von Lindern M, Calkhoven CF. Shwachman-Bodian-Diamond syndrome (SBDS) protein deficiency impairs translation re-initiation from C/EBPα and C/EBPβ mRNAs. Nucleic Acids Res 2016; 44:4134-46. [PMID: 26762974 PMCID: PMC4872075 DOI: 10.1093/nar/gkw005] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 12/31/2015] [Indexed: 01/24/2023] Open
Abstract
Mutations in the Shwachman–Bodian–Diamond Syndrome (SBDS) gene cause Shwachman–Diamond Syndrome (SDS), a rare congenital disease characterized by bone marrow failure with neutropenia, exocrine pancreatic dysfunction and skeletal abnormalities. The SBDS protein is important for ribosome maturation and therefore SDS belongs to the ribosomopathies. It is unknown, however, if loss of SBDS functionality affects the translation of specific mRNAs and whether this could play a role in the development of the clinical features of SDS. Here, we report that translation of the C/EBPα and -β mRNAs, that are indispensible regulators of granulocytic differentiation, is altered by SBDS mutations or knockdown. We show that SBDS function is specifically required for efficient translation re-initiation into the protein isoforms C/EBPα-p30 and C/EBPβ-LIP, which is controlled by a single cis-regulatory upstream open reading frame (uORF) in the 5′ untranslated regions (5′ UTRs) of both mRNAs. Furthermore, we show that as a consequence of the C/EBPα and -β deregulation the expression of MYC is decreased with associated reduction in proliferation, suggesting that failure of progenitor proliferation contributes to the haematological phenotype of SDS. Therefore, our study provides the first indication that disturbance of specific translation by loss of SBDS function may contribute to the development of the SDS phenotype.
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Affiliation(s)
- Kyungmin In
- Leibniz Institute on Aging - Fritz Lipmann Institute, Beutenbergstrasse 11, D-07745 Jena, Germany
| | - Mohamad A Zaini
- Leibniz Institute on Aging - Fritz Lipmann Institute, Beutenbergstrasse 11, D-07745 Jena, Germany European Institute for the Biology of Ageing (ERIBA), University Medical Center Groningen, University of Groningen, 9700 AD, Groningen, The Netherlands
| | - Christine Müller
- Leibniz Institute on Aging - Fritz Lipmann Institute, Beutenbergstrasse 11, D-07745 Jena, Germany European Institute for the Biology of Ageing (ERIBA), University Medical Center Groningen, University of Groningen, 9700 AD, Groningen, The Netherlands
| | - Alan J Warren
- Cambridge Institute for Medical Research, Wellcome Trust-Medical Research Council Stem Cell Institute, the Department of Haematology, University of Cambridge, CB2 0XY, Cambridge, UK
| | - Marieke von Lindern
- Sanquin Research and Landsteiner Laboratory, Department of Hematopoiesis, 1066 CX Amsterdam, The Netherlands
| | - Cornelis F Calkhoven
- Leibniz Institute on Aging - Fritz Lipmann Institute, Beutenbergstrasse 11, D-07745 Jena, Germany European Institute for the Biology of Ageing (ERIBA), University Medical Center Groningen, University of Groningen, 9700 AD, Groningen, The Netherlands
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Kanprasoet W, Jensen LT, Sriprach S, Thitiananpakorn K, Rattanapornsompong K, Jensen AN. Deletion of Mitochondrial Porin Alleviates Stress Sensitivity in the Yeast Model of Shwachman-Diamond Syndrome. J Genet Genomics 2015; 42:671-84. [DOI: 10.1016/j.jgg.2015.09.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 09/13/2015] [Accepted: 09/14/2015] [Indexed: 10/23/2022]
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Mercuri A, Cannata E, Perbellini O, Cugno C, Balter R, Zaccaron A, Tridello G, Pizzolo G, De Bortoli M, Krampera M, Cipolli M, Cesaro S. Immunophenotypic analysis of hematopoiesis in patients suffering from Shwachman-Bodian-Diamond Syndrome. Eur J Haematol 2015; 95:308-15. [DOI: 10.1111/ejh.12490] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/11/2014] [Indexed: 01/18/2023]
Affiliation(s)
- Angela Mercuri
- Pediatric Hematology; University of Verona; Verona Italy
| | - Elisa Cannata
- Pediatric Hematology; University of Verona; Verona Italy
| | - Omar Perbellini
- Section of Hematology; Department of Medicine; University of Verona; Verona Italy
| | - Chiara Cugno
- Pediatric Hematology; University of Verona; Verona Italy
| | - Rita Balter
- Pediatric Hematology; University of Verona; Verona Italy
| | - Ada Zaccaron
- Pediatric Hematology; University of Verona; Verona Italy
| | | | - Giovanni Pizzolo
- Section of Hematology; Department of Medicine; University of Verona; Verona Italy
| | | | - Mauro Krampera
- Section of Hematology; Department of Medicine; University of Verona; Verona Italy
| | - Marco Cipolli
- Cystic Fibrosis Center; University of Verona; Verona Italy
| | - Simone Cesaro
- Pediatric Hematology; University of Verona; Verona Italy
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8
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Tulpule A, Kelley JM, Lensch MW, McPherson J, Park IH, Hartung O, Nakamura T, Schlaeger TM, Shimamura A, Daley GQ. Pluripotent stem cell models of Shwachman-Diamond syndrome reveal a common mechanism for pancreatic and hematopoietic dysfunction. Cell Stem Cell 2013; 12:727-36. [PMID: 23602541 DOI: 10.1016/j.stem.2013.04.002] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Revised: 02/24/2013] [Accepted: 04/02/2013] [Indexed: 11/18/2022]
Abstract
Shwachman-Diamond syndrome (SDS), a rare autosomal-recessive disorder characterized by exocrine pancreatic insufficiency and hematopoietic dysfunction, is caused by mutations in the Shwachman-Bodian-Diamond syndrome (SBDS) gene. We created human pluripotent stem cell models of SDS through knockdown of SBDS in human embryonic stem cells (hESCs) and generation of induced pluripotent stem cell (iPSC) lines from two patients with SDS. SBDS-deficient hESCs and iPSCs manifest deficits in exocrine pancreatic and hematopoietic differentiation in vitro, enhanced apoptosis, and elevated protease levels in culture supernatants, which could be reversed by restoring SBDS protein expression through transgene rescue or by supplementing culture media with protease inhibitors. Protease-mediated autodigestion provides a mechanistic link between the pancreatic and hematopoietic phenotypes in SDS, highlighting the utility of hESCs and iPSCs in obtaining novel insights into human disease.
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Affiliation(s)
- Asmin Tulpule
- Division of Pediatric Hematology/Oncology, Boston Children's Hospital, Dana-Farber Cancer Institute, Boston, MA 02115, USA
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Sezgin G, Henson AL, Nihrane A, Singh S, Wattenberg M, Alard P, Ellis SR, Liu JM. Impaired growth, hematopoietic colony formation, and ribosome maturation in human cells depleted of Shwachman-Diamond syndrome protein SBDS. Pediatr Blood Cancer 2013; 60:281-6. [PMID: 22997148 DOI: 10.1002/pbc.24300] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Accepted: 08/06/2012] [Indexed: 12/14/2022]
Abstract
BACKGROUND Shwachman-Diamond syndrome (SDS), associated with SBDS mutations, is characterized by pancreatic exocrine dysfunction and marrow failure. Sdo1, the yeast ortholog of SBDS, is implicated in maturation of the 60S ribosomal subunit, with delayed export of 60S-like particles from the nucleoplasm when depleted. Sdo1 is needed for release of the anti-subunit association factor Tif6 from 60S subunits, and Tif6 may not be recycled to the nucleus when Sdo1 is absent. METHODS To clarify the role of SBDS in human ribosome function, TF-1 erythroleukemia and A549 lung carcinoma cells were transfected with vectors expressing RNAi against SBDS. RESULTS Growth and hematopoietic colony forming potential of TF-1 knockdown cells were markedly hindered when compared to controls. To analyze the effect of SBDS on 60S subunit maturation in A549 cells, subunit localization was assessed by transfection with a vector expressing a fusion between human RPL29 and GFP: we found a higher percentage of SBDS-depleted cells with nuclear localization of 60S subunits. Polysome analysis of TF-1 knockdown cells showed a decrease in free 60S and 80S subunits. We also analyzed the levels of eIF6 (human ortholog of Tif6) following near-complete knockdown of SBDS in TF-1 cells and found an approximately 20% increase in the amount of eIF6 associated with the 60S subunit. CONCLUSIONS We conclude that knockdown of SBDS leads to growth inhibition and defects in ribosome maturation, suggesting a role for wild-type SBDS in nuclear export of pre-60S subunits. Furthermore, knockdown of SBDS may interfere with eIF6 recycling.
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Affiliation(s)
- Gulay Sezgin
- The Feinstein Institute for Medical Research, Manhasset, New York, USA
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Liu JM, Lipton JM, Mani S. Sixth International Congress on Shwachman-Diamond syndrome: from patients to genes and back. Ann N Y Acad Sci 2011; 1242:26-39. [DOI: 10.1111/j.1749-6632.2011.06348.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Abstract
Although anemia is common in Shwachman- Diamond syndrome (SDS), the underlying mechanism remains unclear. We asked whether SBDS, which is mutated in most SDS patients, is critical for erythroid development. We found that SBDS expression is high early during erythroid differentiation. Inhibition of SBDS in CD34(+) hematopoietic stem cells and early progenitors (HSC/Ps) and K562 cells led to slow cell expansion during erythroid differentiation. Induction of erythroid differentiation resulted in markedly accelerated apoptosis in the knockdown cells; however, proliferation was only mildly reduced. The percentage of cells entering differentiation was not reduced. Differentiation also increased the oxidative stress in SBDS-knockdown K562 cells, and antioxidants enhanced the expansion capability of differentiating SBDS-knockdown K562 cells and colony production of SDS patient HSC/Ps. Erythroid differentiation also resulted in reduction of all ribosomal subunits and global translation. Furthermore, stimulation of global translation with leucine improved the erythroid cell expansion of SBDS-knockdown cells and colony production of SDS patient HSC/Ps. Leucine did not reduce the oxidative stress in SBDS-deficient K562 cells. These results demonstrate that SBDS is critical for normal erythropoiesis. Erythropoietic failure caused by SBDS deficiency is at least in part related to elevated ROS levels and translation insufficiency because antioxidants and leucine improved cell expansion.
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Mislocalization or low expression of mutated Shwachman–Bodian–Diamond syndrome protein. Int J Hematol 2011; 94:54-62. [DOI: 10.1007/s12185-011-0880-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 05/17/2011] [Accepted: 05/19/2011] [Indexed: 11/27/2022]
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13
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Leung R, Cuddy K, Wang Y, Rommens J, Glogauer M. Sbds is required for Rac2-mediated monocyte migration and signaling downstream of RANK during osteoclastogenesis. Blood 2011; 117:2044-53. [PMID: 21084708 DOI: 10.1182/blood-2010-05-282574] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Shwachman-Diamond syndrome (SDS) results from mutations in the SBDS gene, characterized by exocrine pancreatic insufficiency and hematologic and skeletal abnormalities. Neutropenia and neutrophil dysfunction are hallmark features of SDS; however, causes for the bone defects are unknown. Dysfunction of bone-resorbing osteoclasts, formed by the fusion of monocytic progenitors derived from the same granulocytic precursors as neutrophils, could be responsible. We report that Sbds is required for in vitro and in vivo osteoclastogenesis (OCG). Sbds-null murine monocytes formed osteoclasts of reduced number and size because of impaired migration and fusion required for OCG. Phenotypically, Sbds-null mice exhibited low-turnover osteoporosis consistent with findings in SDS patients. Western blotting of Rho GTPases that control actin dynamics and migration showed a 5-fold decrease in Rac2, whereas Rac1, Cdc42, and RhoA were unchanged or only mildly reduced. Although migration was rescued on Rac2 supplementation, OCG was not. This was attributed to impaired signaling downstream of receptor activator of nuclear factor-κB (RANK) and reduced expression of the RANK-ligand-dependent fusion receptor DC-STAMP. We conclude that Sbds is required for OCG by regulating monocyte migration via Rac2 and osteoclast differentiation signaling downstream of RANK. Impaired osteoclast formation could disrupt bone homeostasis, resulting in skeletal abnormalities seen in SDS patients.
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Affiliation(s)
- Roland Leung
- Matrix Dynamics Group, University of Toronto, Toronto, ON, Canada
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Wong TE, Calicchio ML, Fleming MD, Shimamura A, Harris MH. SBDS protein expression patterns in the bone marrow. Pediatr Blood Cancer 2010; 55:546-9. [PMID: 20658628 PMCID: PMC2913690 DOI: 10.1002/pbc.22573] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Shwachman-Diamond syndrome (SDS) is an inherited bone marrow failure syndrome caused by biallelic SBDS gene mutations. Here we examined SBDS protein levels in human bone marrow. SBDS protein expression was high in neutrophil progenitors, megakaryocytes, plasma cells, and osteoblasts. In contrast, SBDS protein levels were low in all hematopoietic cell lineages from patients harboring the common SBDS mutations. We conclude that SBDS protein levels vary widely between specific marrow lineages. Uniformly low SBDS protein expression levels distinguish the majority of SDS patients from controls or other marrow failure syndromes.
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Affiliation(s)
- Trisha E. Wong
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA,Department of Pediatrics, University of Washington/Seattle Children’s Hospital Seattle, WA
| | | | - Mark D. Fleming
- Department of Pathology, Children's Hospital Boston, Boston, MA,Department of Pathology, Harvard Medical School, Boston, MA
| | - Akiko Shimamura
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA,Department of Pediatrics, University of Washington/Seattle Children’s Hospital Seattle, WA
| | - Marian H. Harris
- Department of Pathology, Children's Hospital Boston, Boston, MA,Department of Pathology, Harvard Medical School, Boston, MA,Department of Pathology, Brigham Women’s Hospital, Boston, MA
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SBDS expression and localization at the mitotic spindle in human myeloid progenitors. PLoS One 2009; 4:e7084. [PMID: 19759903 PMCID: PMC2738965 DOI: 10.1371/journal.pone.0007084] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Accepted: 08/23/2009] [Indexed: 01/08/2023] Open
Abstract
Background Shwachman-Diamond Syndrome (SDS) is a hereditary disease caused by mutations in the SBDS gene. SDS is clinically characterized by pancreatic insufficiency, skeletal abnormalities and bone marrow dysfunction. The hematologic abnormalities include neutropenia, neutrophil chemotaxis defects, and an increased risk of developing Acute Myeloid Leukemia (AML). Although several studies have suggested that SBDS as a protein plays a role in ribosome processing/maturation, its impact on human neutrophil development and function remains to be clarified. Methodology/Principal Findings We observed that SBDS RNA and protein are expressed in the human myeloid leukemia PLB-985 cell line and in human hematopoietic progenitor cells by quantitative RT-PCR and Western blot analysis. SBDS expression is downregulated during neutrophil differentiation. Additionally, we observed that the differentiation and proliferation capacity of SDS-patient bone marrow hematopoietic progenitor cells in a liquid differentiation system was reduced as compared to control cultures. Immunofluorescence analysis showed that SBDS co-localizes with the mitotic spindle and in vitro binding studies reveal a direct interaction of SBDS with microtubules. In interphase cells a perinuclear enrichment of SBDS protein which co-localized with the microtubule organizing center (MTOC) was observed. Also, we observed that transiently expressed SDS patient-derived SBDS-K62 or SBDS-C84 mutant proteins could co-localize with the MTOC and mitotic spindle. Conclusions/Significance SBDS co-localizes with the mitotic spindle, suggesting a role for SBDS in the cell division process, which corresponds to the decreased proliferation capacity of SDS-patient bone marrow CD34+ hematopoietic progenitor cells in our culture system and also to the neutropenia in SDS patients. A role in chromosome missegregation has not been clarified, since similar spatial and time-dependent localization is observed when patient-derived SBDS mutant proteins are studied. Thus, the increased risk of myeloid malignancy in SDS remains unexplained.
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Ball HL, Zhang B, Riches JJ, Gandhi R, Li J, Rommens JM, Myers JS. Shwachman-Bodian Diamond syndrome is a multi-functional protein implicated in cellular stress responses. Hum Mol Genet 2009; 18:3684-95. [PMID: 19602484 DOI: 10.1093/hmg/ddp316] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Shwachman-Diamond syndrome (SDS; OMIM 260400) results from loss-of-function mutations in the Shwachman-Bodian Diamond syndrome (SBDS) gene. It is a multi-system disorder with clinical features of exocrine pancreatic dysfunction, skeletal abnormalities, bone marrow failure and predisposition to leukemic transformation. Although the cellular functions of SBDS are still unclear, its yeast ortholog has been implicated in ribosome biogenesis. Using affinity capture and mass spectrometry, we have developed an SBDS-interactome and report SBDS binding partners with diverse molecular functions, notably components of the large ribosomal subunit and proteins involved in DNA metabolism. Reciprocal co-immunoprecipitation confirmed the interaction of SBDS with the large ribosomal subunit protein RPL4 and with DNA-PK and RPA70, two proteins with critical roles in DNA repair. Function for SBDS in response to cellular stresses was implicated by demonstrating that SBDS-depleted HEK293 cells are hypersensitive to multiple types of DNA damage as well as chemically induced endoplasmic reticulum stress. Furthermore, using multiple routes to impair translation and mimic the effect of SBDS-depletion, we show that SBDS-dependent hypersensitivity of HEK293 cells to UV irradiation can be distinguished from a role of SBDS in translation. These results indicate functions of SBDS beyond ribosome biogenesis and may provide insight into the poorly understood cancer predisposition of SDS patients.
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Affiliation(s)
- Heather L Ball
- Program in Genetics and Genome Biology, Research Institute, The Hospital for Sick Children, Toronto, Canada
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Rawls AS, Gregory AD, Woloszynek JR, Liu F, Link DC. Lentiviral-mediated RNAi inhibition of Sbds in murine hematopoietic progenitors impairs their hematopoietic potential. Blood 2007; 110:2414-22. [PMID: 17638857 PMCID: PMC1988923 DOI: 10.1182/blood-2006-03-007112] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Shwachman-Diamond syndrome (SDS) is a rare multisystem disorder characterized by exocrine pancreatic insufficiency, multilineage hematopoietic dysfunction, and metaphyseal chondrodysplasia. Bone marrow dysfunction is present in nearly all patients with SDS, with neutropenia being the most common abnormality. The majority of patients with SDS have mutations in the Shwachman Bodian Diamond syndrome (SBDS) gene. We have developed a strategy to examine the consequences of lentiviral-mediated RNA interference (RNAi) of Sbds on hematopoiesis. Here, we report that both Sbds RNA and protein expression can be efficiently inhibited in primary murine hematopoietic cells using lentiviral-mediated RNAi. Inhibition of Sbds results in a defect in granulocytic differentiation in vitro and impairs myeloid progenitor generation in vivo. In addition, short-term hematopoietic engraftment was impaired, which is due in part to reduced homing of hematopoietic progenitors to the bone marrow. Finally, we show that inhibition of Sbds is associated with a decrease in circulating B lymphocytes, despite evidence of normal B lymphopoiesis. These data provide the first evidence that loss of Sbds is sufficient to induce abnormalities in hematopoiesis.
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Affiliation(s)
- Amy S Rawls
- Division of Oncology, Department of Medicine, Washington University School of Medicine, St Louis, MO 63110, USA
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