1
|
Diazzi S, Baeri A, Fassy J, Lecacheur M, Marin-Bejar O, Girard CA, Lefevre L, Lacoux C, Irondelle M, Mounier C, Truchi M, Couralet M, Ohanna M, Carminati A, Berestjuk I, Larbret F, Gilot D, Vassaux G, Marine JC, Deckert M, Mari B, Tartare-Deckert S. Blockade of the pro-fibrotic reaction mediated by the miR-143/-145 cluster enhances the responses to targeted therapy in melanoma. EMBO Mol Med 2022; 14:e15295. [PMID: 35156321 PMCID: PMC8899916 DOI: 10.15252/emmm.202115295] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 01/04/2022] [Accepted: 01/10/2022] [Indexed: 12/20/2022] Open
Abstract
Lineage dedifferentiation toward a mesenchymal‐like state displaying myofibroblast and fibrotic features is a common mechanism of adaptive and acquired resistance to targeted therapy in melanoma. Here, we show that the anti‐fibrotic drug nintedanib is active to normalize the fibrous ECM network, enhance the efficacy of MAPK‐targeted therapy, and delay tumor relapse in a preclinical model of melanoma. Acquisition of this resistant phenotype and its reversion by nintedanib pointed to miR‐143/‐145 pro‐fibrotic cluster as a driver of this mesenchymal‐like phenotype. Upregulation of the miR‐143/‐145 cluster under BRAFi/MAPKi therapy was observed in melanoma cells in vitro and in vivo and was associated with an invasive/undifferentiated profile. The 2 mature miRNAs generated from this cluster, miR‐143‐3p and miR‐145‐5p, collaborated to mediate transition toward a drug‐resistant undifferentiated mesenchymal‐like state by targeting Fascin actin‐bundling protein 1 (FSCN1), modulating the dynamic crosstalk between the actin cytoskeleton and the ECM through the regulation of focal adhesion dynamics and mechanotransduction pathways. Our study brings insights into a novel miRNA‐mediated regulatory network that contributes to non‐genetic adaptive drug resistance and provides proof of principle that preventing MAPKi‐induced pro‐fibrotic stromal response is a viable therapeutic opportunity for patients on targeted therapy.
Collapse
Affiliation(s)
- Serena Diazzi
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Alberto Baeri
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France
| | - Julien Fassy
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France
| | - Margaux Lecacheur
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Oskar Marin-Bejar
- Laboratory For Molecular Cancer Biology, VIB Center for Cancer Biology, VIB, Leuven, Belgium.,Department of Oncology, KU Leuven, Leuven, Belgium
| | - Christophe A Girard
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Lauren Lefevre
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Caroline Lacoux
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France
| | | | - Carine Mounier
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France.,CYU Université, ERRMECe (EA1391), Neuville-sur-Oise, France
| | - Marin Truchi
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France
| | - Marie Couralet
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France
| | - Mickael Ohanna
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Alexandrine Carminati
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Ilona Berestjuk
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Frederic Larbret
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - David Gilot
- INSERM U1242, University of Rennes, Rennes, France
| | - Georges Vassaux
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France
| | - Jean-Christophe Marine
- Laboratory For Molecular Cancer Biology, VIB Center for Cancer Biology, VIB, Leuven, Belgium.,Department of Oncology, KU Leuven, Leuven, Belgium
| | - Marcel Deckert
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France
| | - Bernard Mari
- Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), Sophia Antipolis, France.,FHU-OncoAge, Nice, France
| | - Sophie Tartare-Deckert
- Université Côte d'Azur, INSERM, C3M, Nice, France.,Equipe labellisée Ligue Contre le Cancer, Nice, France.,FHU-OncoAge, Nice, France
| |
Collapse
|
2
|
Luci C, Vieira E, Bourinet M, Rousseau D, Bonnafous S, Patouraux S, Lefevre L, Larbret F, Prod’homme V, Iannelli A, Tran A, Anty R, Bailly-Maitre B, Deckert M, Gual P. SYK-3BP2 Pathway Activity in Parenchymal and Myeloid Cells Is a Key Pathogenic Factor in Metabolic Steatohepatitis. Cell Mol Gastroenterol Hepatol 2021; 13:173-191. [PMID: 34411785 PMCID: PMC8593618 DOI: 10.1016/j.jcmgh.2021.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 08/09/2021] [Accepted: 08/10/2021] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Spleen tyrosine kinase (SYK) signaling pathway regulates critical processes in innate immunity, but its role in parenchymal cells remains elusive in chronic liver diseases. We investigate the relative contribution of SYK and its substrate c-Abl Src homology 3 domain-binding protein-2 (3BP2) in both myeloid cells and hepatocytes in the onset of metabolic steatohepatitis. METHODS Hepatic SYK-3BP2 pathway was evaluated in mouse models of metabolic-associated fatty liver diseases (MAFLD) and in obese patients with biopsy-proven MAFLD (n = 33). Its role in liver complications was evaluated in Sh3bp2 KO and myeloid-specific Syk KO mice challenged with methionine and choline deficient diet and in homozygous Sh3bp2KI/KI mice with and without SYK expression in myeloid cells. RESULTS Here we report that hepatic expression of 3BP2 and SYK correlated with metabolic steatohepatitis severity in mice. 3BP2 deficiency and SYK deletion in myeloid cells mediated the same protective effects on liver inflammation, injury, and fibrosis priming upon diet-induced steatohepatitis. In primary hepatocytes, the targeting of 3BP2 or SYK strongly decreased the lipopolysaccharide-mediated inflammatory mediator expression and 3BP2-regulated SYK expression. In homozygous Sh3bp2KI/KI mice, the chronic inflammation mediated by the proteasome-resistant 3BP2 mutant promoted severe hepatitis and liver fibrosis with augmented liver SYK expression. In these mice, the deletion of SYK in myeloid cells was sufficient to prevent these liver lesions. The hepatic expression of SYK is also up-regulated with metabolic steatohepatitis and correlates with liver macrophages in biopsy-proven MAFLD patients. CONCLUSIONS Collectively, these data suggest an important role for the SYK-3BP2 pathway in the pathogenesis of chronic liver inflammatory diseases and highlight its targeting in hepatocytes and myeloid cells as a potential strategy to treat metabolic steatohepatitis.
Collapse
Affiliation(s)
- Carmelo Luci
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France
| | - Elodie Vieira
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France
| | - Manon Bourinet
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France
| | | | | | | | - Lauren Lefevre
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France
| | | | | | | | - Albert Tran
- Université Côte d’Azur, CHU, INSERM, U1065, C3M, Nice, France
| | - Rodolphe Anty
- Université Côte d’Azur, CHU, INSERM, U1065, C3M, Nice, France
| | | | - Marcel Deckert
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France,Marcel Deckert, PhD, Inserm UMR1065/C3M, Bâtiment Universitaire ARCHIMED, Team "Microenvironment, signaling and cancer", 151 route Saint Antoine de Ginestière, BP 2 3194, 06204 Nice, France.
| | - Philippe Gual
- Université Côte d’Azur, INSERM, U1065, C3M, Nice, France,Correspondence Address correspondence to: Philippe Gual, PhD, Inserm UMR1065/C3M, Bâtiment Universitaire ARCHIMED, Team "Chronic liver diseases associated with obesity and alcohol", 151 route Saint Antoine de Ginestière, BP 2 3194, 06204 Nice, France. fax: +33 4 89 06 42 60.
| |
Collapse
|
3
|
Rathore M, Girard C, Ohanna M, Tichet M, Ben Jouira R, Garcia E, Larbret F, Gesson M, Audebert S, Lacour JP, Montaudié H, Prod'Homme V, Tartare-Deckert S, Deckert M. Cancer cell-derived long pentraxin 3 (PTX3) promotes melanoma migration through a toll-like receptor 4 (TLR4)/NF-κB signaling pathway. Oncogene 2019; 38:5873-5889. [PMID: 31253871 DOI: 10.1038/s41388-019-0848-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 03/30/2019] [Accepted: 04/28/2019] [Indexed: 01/23/2023]
Abstract
Cutaneous melanoma is one of the most aggressive cancers characterized by a high plasticity, a propensity for metastasis, and drug resistance. Melanomas are composed of phenotypically diverse subpopulations of tumor cells with heterogeneous molecular profiles that reflect intrinsic invasive abilities. In an attempt to identify novel factors of the melanoma invasive cell state, we previously investigated the nature of the invasive secretome by using a comparative proteomic approach. Here, we have extended this analysis to show that PTX3, an acute phase inflammatory glycoprotein, is one such factor secreted by invasive melanoma to promote tumor cell invasiveness. Elevated PTX3 production was observed in the population of MITFlow invasive cells but not in the population of MITFhigh differentiated melanoma cells. Consistently, MITF knockdown increased PTX3 expression in MITFhigh proliferative and poorly invasive cells. High levels of PTX3 were found in tissues and blood of metastatic melanoma patients, and in BRAF inhibitor-resistant melanoma cells displaying a mesenchymal invasive MITFlow phenotype. Genetic silencing of PTX3 in invasive melanoma cells dramatically impaired migration and invasion in vitro and in experimental lung extravasation assay in xenografted mice. In contrast, addition of melanoma-derived or recombinant PTX3, or expression of PTX3 enhanced motility of low migratory cells. Mechanistically, autocrine production of PTX3 by melanoma cells triggered an IKK/NFκB signaling pathway that promotes migration, invasion, and expression of the EMT factor TWIST1. Finally, we found that TLR4 and MYD88 knockdown inhibited PTX3-induced melanoma cell migration, suggesting that PTX3 functions through a TLR4-dependent pathway. Our work reveals that tumor-derived PTX3 contributes to melanoma cell invasion via targetable inflammation-related pathways. In addition to providing new insights into the biology of melanoma invasive behavior, this study underscores the notion that secreted PTX3 represents a potential biomarker and therapeutic target in a subpopulation of MITFlow invasive and/or refractory melanoma.
Collapse
Affiliation(s)
- M Rathore
- Université Côte d'Azur, INSERM, C3M, Nice, France
- Equipe labellisée Ligue Contre le Cancer 2016, Nice, France
- The Hormel Institute, University of Minnesota, Austin, MN, USA
| | - C Girard
- Université Côte d'Azur, INSERM, C3M, Nice, France
- Equipe labellisée Ligue Contre le Cancer 2016, Nice, France
| | - M Ohanna
- Université Côte d'Azur, INSERM, C3M, Nice, France
- Equipe labellisée Ligue Contre le Cancer 2016, Nice, France
| | - M Tichet
- Université Côte d'Azur, INSERM, C3M, Nice, France
- Laboratory of Translational Oncology, ISREC, EPFL, Lausanne, Switzerland
| | - R Ben Jouira
- Université Côte d'Azur, INSERM, C3M, Nice, France
| | - E Garcia
- Université Côte d'Azur, INSERM, C3M, Nice, France
| | - F Larbret
- Université Côte d'Azur, INSERM, C3M, Nice, France
- Equipe labellisée Ligue Contre le Cancer 2016, Nice, France
| | - M Gesson
- Université Côte d'Azur, INSERM, C3M, Nice, France
| | - S Audebert
- Aix-Marseille University, CNRS, INSERM, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - J-P Lacour
- Université Côte d'Azur, CHU Nice, Nice, France
| | - H Montaudié
- Université Côte d'Azur, CHU Nice, Nice, France
| | - V Prod'Homme
- Université Côte d'Azur, INSERM, C3M, Nice, France
- Equipe labellisée Ligue Contre le Cancer 2016, Nice, France
| | - S Tartare-Deckert
- Université Côte d'Azur, INSERM, C3M, Nice, France.
- Equipe labellisée Ligue Contre le Cancer 2016, Nice, France.
| | - M Deckert
- Université Côte d'Azur, INSERM, C3M, Nice, France.
- Equipe labellisée Ligue Contre le Cancer 2016, Nice, France.
| |
Collapse
|
4
|
Ibáñez L, Pontier-Bres R, Larbret F, Rekima A, Verhasselt V, Blin-Wakkach C, Czerucka D. Saccharomyces boulardii Strain CNCM I-745 Modifies the Mononuclear Phagocytes Response in the Small Intestine of Mice Following Salmonella Typhimurium Infection. Front Immunol 2019; 10:643. [PMID: 31001263 PMCID: PMC6455222 DOI: 10.3389/fimmu.2019.00643] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 03/08/2019] [Indexed: 12/23/2022] Open
Abstract
Intestinal mononuclear phagocytes (MPs) comprise dendritic cells (DCs) and macrophages (Mφs) that play different roles in response to Salmonella infection. After phagocytosis, DCs expressing CD103 transport Salmonella from the intestinal tract to the mesenteric lymph nodes (MLN) and induce adaptive immune responses whereas resident Mφs expressing CX3CR1 capture bacteria in the lumen and reside in the lamina propria (LP) where they induce a local immune response. CX3CR1+ Mφs are generated from Ly6Chi monocytes that enter the colonic mucosa and differentiate locally. We previously demonstrated that the probiotic yeast Saccharomyces boulardii CNCM I-745 (S.b) prevents infection by Salmonella enterica serovar Typhimurium (ST), decreases ST translocation to the peripheral organs and modifies the pro-and anti-inflammatory cytokine profiles in the gut. In the present study, we investigated the effect of S.b on the migratory CD103+ DCs and the resident CX3CR1+ Mφs. MPs were isolated from the LP of streptomycin-treated mice infected by ST with or without S.b treatment before or during the infection. In S.b-pretreated mice, we observed a decrease of the CD103+ DCs in the LP that was associated with the drop of ST recovery from MLN. Interestingly, S.b induced an infiltration of LP by classical Ly6Chi monocytes, and S.b modified the monocyte-Mφ maturation process in ST-infected mice. Our results showed that S.b treatment induced the expansion of Ly6Chi monocytes in the blood as well as in the bone marrow (BM) of mice, thus contributing to the Mφ replenishment in LP from blood monocytes. In vitro experiments conducted on BM cells confirmed that S.b induced the expansion of CX3CR1+ Mφs and concomitantly ST phagocytosis. Altogether, these data demonstrate that Saccharomyces boulardii CNCM I-745 modulates the innate immune response. Although here, we cannot explicitly delineate direct effects on ST from innate immunity, S. b-amplified innate immunity correlated with partial protection from ST infection. This study shows that S.b can induce the expansion of classical monocytes that are precursors of resident Mφs in the LP.
Collapse
Affiliation(s)
- Lidia Ibáñez
- CNRS, UMR 7370, LP2M, Faculté de Médecine, University Nice Sophia Antipolis, Nice, France.,University Nice Sophia Antipolis, Nice, France
| | | | - Frederic Larbret
- University Nice Sophia Antipolis, Nice, France.,EA6303, University Nice Sophia Antipolis, Hopital de l'Archet, Nice, France
| | - Akila Rekima
- EA6303, University Nice Sophia Antipolis, Hopital de l'Archet, Nice, France
| | - Valérie Verhasselt
- EA6303, University Nice Sophia Antipolis, Hopital de l'Archet, Nice, France
| | - Claudine Blin-Wakkach
- CNRS, UMR 7370, LP2M, Faculté de Médecine, University Nice Sophia Antipolis, Nice, France.,University Nice Sophia Antipolis, Nice, France
| | - Dorota Czerucka
- Ecosystems and Immunity team, Centre Scientifique de Monaco, Monaco, Monaco
| |
Collapse
|
5
|
Roustan F, Clavel S, Larbret F, Tibi B, Ahallal Y, Durand M, Ambrosetti D, Torrino S, Bost F. Mise en place d’un modèle d’organoïde de cancer de prostate : applications thérapeutiques. Prog Urol 2018. [DOI: 10.1016/j.purol.2018.07.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
6
|
Merlin J, Ivanov S, Sergushichev A, Stunault M, Viaud M, Ayrault M, Larbret F, Guinamard R, Artyomov M, Yvan-charvet L. Myeloid cells glutaminolysis controls monocyte numbers and macrophage efferocytosis during atherosclerosis. Atherosclerosis 2018. [DOI: 10.1016/j.atherosclerosis.2018.06.097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
7
|
Guillemot E, Karimdjee-Soilihi B, Pradelli E, Benchetrit M, Goguet-Surmenian E, Millet MA, Larbret F, Michiels JF, Birnbaum D, Alemanno P, Schmid-Antomarchi H, Schmid-Alliana A. CXCR7 receptors facilitate the progression of colon carcinoma within lung not within liver. Br J Cancer 2012; 107:1944-9. [PMID: 23169289 PMCID: PMC3516689 DOI: 10.1038/bjc.2012.503] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Background: Liver and lung metastases are the predominant cause of colorectal cancer (CRC)-related mortality. Chemokine-receptor pairs have a critical role in determining the metastatic progression of tumours. Our hypothesis was that disruption of CXCR7/CXCR7 ligands axis could lead to a decrease in CRC metastases. Methods: Primary tumours and metastatic tissues from patients with CRC were tested for the expression of CXCR7 and its ligands. Relevance of CXCR7/CXCR7 ligands for CRC metastasis was then investigated in mice using small pharmacological CXCR7 antagonists and CRC cell lines of human and murine origins, which – injected into mice – enable the development of lung and liver metastases. Results: Following injection of CRC cells, mice treated daily with CXCR7 antagonists exhibited a significant reduction in lung metastases. However, CXCR7 antagonists failed to reduce the extent of liver metastasis. Moreover, there were subtle differences in the expression of CXCR7 and its ligands between lung and liver metastases. Conclusion: Our study suggests that the activation of CXCR7 on tumour blood vessels by its ligands may facilitate the progression of CRC within lung but not within liver. Moreover, we provide evidence that targeting the CXCR7 axis may be beneficial to limit metastasis from colon cancer within the lungs.
Collapse
Affiliation(s)
- E Guillemot
- Université de Nice Sophia-Antipolis, UFR Sciences, Nice 06108, France
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Mahiddine K, Bernard G, Larbret F, Mallavialle A, Bzioueche H, Bernard A. CD99 differentially modulate transcriptional regulation of classical MHC class I and CD1a molecules (130.23). The Journal of Immunology 2010. [DOI: 10.4049/jimmunol.184.supp.130.23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
We have previously established that CD99, a ubiquitous surface molecule expressed as two isoforms, could regulate classical MHC class I (class I) expression. Fine tuning of class I during differentiation and activation of professional APC should be crucial event which deserve to be carefully examinated. Surprisingly, we found that expression of CD1a was inversely regulated to class I expression by a mechanism involving CD99. Using the Jurkat cell line, we have demonstrated that Class I and CD1a transcriptions levels are dictated by CD99 long isoform (CD99LF). CD99LF enhances Class I transcription and therefore its expression, while down regulating CD1a. We also showed that this regulation is counteracted in the presence of CD99 short form (CD99SF). Therefore, expression of both CD99 isoforms allows expression of class I and non classical MHC CD1a molecules at plasma membrane without requiring β2M modulation. To confirm our results, we used CD14+ monocytes and their derived dendritic cells. Performing qRT-PCR, flow cytometry and CD99 silencing experiments, we have demonstrated that generation of CD1a positive dendritic cells (mDC1) depends on a mechanism involving an expression switch from CD99LF to both CD99 isoforms. We hypothesize that lack of CD99 switches leads to CD1a negative (mDC2) generation. This regulatory mechanism appears to be therefore crucial for mDC1 or mDC2 orientations, which are distinguished by their different capacities to direct Th cell differentiation.
Collapse
Affiliation(s)
- Karim Mahiddine
- 1INSERM U576, Nice, France
- 2université de Nice Sophia Antipolis, Nice, France
| | - Ghislaine Bernard
- 1INSERM U576, Nice, France
- 2université de Nice Sophia Antipolis, Nice, France
| | - Frederic Larbret
- 1INSERM U576, Nice, France
- 2université de Nice Sophia Antipolis, Nice, France
| | - Aude Mallavialle
- 1INSERM U576, Nice, France
- 2université de Nice Sophia Antipolis, Nice, France
| | - Hanene Bzioueche
- 1INSERM U576, Nice, France
- 2université de Nice Sophia Antipolis, Nice, France
| | - Alain Bernard
- 1INSERM U576, Nice, France
- 2université de Nice Sophia Antipolis, Nice, France
| |
Collapse
|
9
|
Raslova H, Komura E, Le Couédic JP, Larbret F, Debili N, Feunteun J, Danos O, Albagli O, Vainchenker W, Favier R. FLI1 monoallelic expression combined with its hemizygous loss underlies Paris-Trousseau/Jacobsen thrombopenia. J Clin Invest 2004; 114:77-84. [PMID: 15232614 PMCID: PMC437972 DOI: 10.1172/jci21197] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2004] [Accepted: 04/20/2004] [Indexed: 11/17/2022] Open
Abstract
Paris-Trousseau syndrome (PTS; also known as Jacobsen syndrome) is characterized by several congenital anomalies including a dysmegakaryopoiesis with two morphologically distinct populations of megakaryocytes (MKs). PTS patients harbor deletions on the long arm of chromosome 11, including the FLI1 gene, which encodes a transcription factor essential for megakaryopoiesis. We show here that lentivirus-mediated overexpression of FLI1 in patient CD34(+) cells restores the megakaryopoiesis in vitro, indicating that FLI1 hemizygous deletion contributes to the PTS hematopoietic defects. FISH analysis on pre-mRNA and single-cell RT-PCR revealed that FLI1 expression is mainly monoallelic in CD41(+)CD42(-) progenitors, while it is predominantly biallelic in the other stages of megakaryopoiesis. In PTS cells, the hemizygous deletion of FLI1 generates a subpopulation of CD41(+)CD42(-) cells completely lacking FLI1 transcription. We propose that the absence of FLI1 expression in these CD41(+)CD42(-) cells might prevent their differentiation, which could explain the segregation of the PTS MKs into two subpopulations: one normal and one composed of small immature MKs undergoing a massive lysis, presumably originating from either FLI1(+) or FLI1(-) CD41(+)CD42(-) cells, respectively. Thus, we point to the role of transient monoallelic expression of a gene essential for differentiation in the genesis of human haploinsufficiency-associated disease and suggest that such a mechanism may be involved in the pathogenesis of other congenital or acquired genetic diseases.
Collapse
Affiliation(s)
- Hana Raslova
- Institut National de la Santé et de la Recherche Médicale U 362, Villejuif, France
| | | | | | | | | | | | | | | | | | | |
Collapse
|