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Yang J, Ruan J, Zhou B, Ye S, Gao S, Zheng X. Regulation of STAT5 phosphorylation and interaction with SHP1 by lnc-AC004893, a long non-coding RNA overexpressed in myeloproliferative neoplasms. Hematology 2024; 29:2375045. [PMID: 39012197 DOI: 10.1080/16078454.2024.2375045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 06/25/2024] [Indexed: 07/17/2024] Open
Abstract
OBJECTIVES Constitutive activation of Janus kinase 2 (JAK2)/signal transducer and activator of transcription (STAT) signaling pathway is central to the pathogenesis of myeloproliferative neoplasms (MPNs). Long noncoding RNAs (lncRNAs) regulate diverse biological processes. However, the role of lncRNAs in MPN pathogenesis is not well studied. METHODS The expression of lnc-AC004893 in MPN patients was measured by quantitative real-time PCR (qRT-PCR). Gene-specific short hairpin RNAs (shRNAs) were designed to inhibit the expression of lnc-AC004893, and western blot was performed to explore the role of lnc-AC004893 via regulating the JAK2/STAT5 signaling pathway. Furthermore, co-IP was performed to determine the binding ability of lnc-AC004893 and STAT5 protein. Finally, the BaF3-JAK2V617F-transplanted mouse model was used to assess the biological role of lnc-ac004893 in vivo. RESULTS We report that lnc-AC004893, a poorly conserved pseudogene-209, is substantially upregulated in MPN cells compared with normal controls (NCs). Knockdown of lnc-AC004893 by specific shRNAs suppressed cell proliferation and decreased colony formation. Furthermore, the knockdown of lnc-AC004893 reduced the expression of p-STAT5 but not total STAT5 in HEL and murine IL-3-dependent Ba/F3 cells, which present constitutive and inducible activation of JAK2/STAT5 signaling. In addition, inhibition of murine lnc-ac004893 attenuated BaF3-JAK2V617F-transplanted phenotypes and extended the overall survival. Mechanistically, knockdown of lnc-AC004893 enhanced the binding ability of STAT5 and protein tyrosine phosphatase SHP1. Furthermore, knockdown of lnc-AC004893 decreased STAT5-lnc-AC004893 interaction but not SHP1-lnc-AC004893 interaction. CONCLUSION Lnc-AC004893 regulates STAT5 phosphorylation by affecting the interaction of STAT5 and SHP1. Lnc-AC004893 might be a potential therapeutic target for MPN patients.
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Affiliation(s)
- Junjun Yang
- Department of Laboratory Medicine, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Jichen Ruan
- Department of Hematology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Bin Zhou
- Medical Research Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Sisi Ye
- Medical Research Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Shenmeng Gao
- Medical Research Center, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Xiaoqun Zheng
- Department of Laboratory Medicine, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
- School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, People's Republic of China
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Lee S, Zhan H. Deciphering the differential impact of thrombopoietin/MPL signaling on hematopoietic stem/progenitor cell function in bone marrow and spleen. Stem Cell Reports 2024; 19:211-223. [PMID: 38215758 PMCID: PMC10874852 DOI: 10.1016/j.stemcr.2023.12.004] [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: 04/27/2023] [Revised: 12/11/2023] [Accepted: 12/12/2023] [Indexed: 01/14/2024] Open
Abstract
Thrombopoietin (TPO) and its receptor MPL play crucial roles in hematopoietic stem cell (HSC) function and platelet production. However, the precise effects of TPO/MPL signaling on HSC regulation in different hematopoietic niches remain unclear. Here, we investigated the effects of TPO/MPL ablation on marrow and splenic hematopoiesis in TPO-/- and MPL-/- mice during aging. Despite severe thrombocytopenia, TPO-/- and MPL-/- mice did not develop marrow failure during a 2-year follow-up. Marrow and splenic HSCs exhibited different responses to TPO/MPL ablation and exogenous TPO treatment. Splenic niche cells compensated for marrow HSC loss in TPO-/- and MPL-/- mice by upregulating CXCL12 levels. These findings provide new insights into the complex regulation of HSCs by TPO/MPL and reveal a previously unknown link between TPO and CXCL12, two key growth factors for HSC maintenance. Understanding the distinct regulatory mechanisms between marrow and spleen hematopoiesis will help to develop novel therapeutic approaches for hematopoietic disorders.
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Affiliation(s)
- Sandy Lee
- Graduate Program in Molecular & Cellular Pharmacology, Stony Brook University, Stony Brook, NY, USA
| | - Huichun Zhan
- Department of Medicine, Stony Brook School of Medicine, Stony Brook, NY, USA; Medical Service, Northport VA Medical Center, Northport, NY, USA.
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Hasselbalch HC, Junker P, Skov V, Kjær L, Knudsen TA, Larsen MK, Holmström MO, Andersen MH, Jensen C, Karsdal MA, Willumsen N. Revisiting Circulating Extracellular Matrix Fragments as Disease Markers in Myelofibrosis and Related Neoplasms. Cancers (Basel) 2023; 15:4323. [PMID: 37686599 PMCID: PMC10486581 DOI: 10.3390/cancers15174323] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 08/04/2023] [Accepted: 08/07/2023] [Indexed: 09/10/2023] Open
Abstract
Philadelphia chromosome-negative chronic myeloproliferative neoplasms (MPNs) arise due to acquired somatic driver mutations in stem cells and develop over 10-30 years from the earliest cancer stages (essential thrombocythemia, polycythemia vera) towards the advanced myelofibrosis stage with bone marrow failure. The JAK2V617F mutation is the most prevalent driver mutation. Chronic inflammation is considered to be a major pathogenetic player, both as a trigger of MPN development and as a driver of disease progression. Chronic inflammation in MPNs is characterized by persistent connective tissue remodeling, which leads to organ dysfunction and ultimately, organ failure, due to excessive accumulation of extracellular matrix (ECM). Considering that MPNs are acquired clonal stem cell diseases developing in an inflammatory microenvironment in which the hematopoietic cell populations are progressively replaced by stromal proliferation-"a wound that never heals"-we herein aim to provide a comprehensive review of previous promising research in the field of circulating ECM fragments in the diagnosis, treatment and monitoring of MPNs. We address the rationales and highlight new perspectives for the use of circulating ECM protein fragments as biologically plausible, noninvasive disease markers in the management of MPNs.
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Affiliation(s)
- Hans Carl Hasselbalch
- Department of Hematology, Zealand University Hospital, 4000 Roskilde, Denmark; (V.S.); (L.K.); (T.A.K.); (M.K.L.)
| | - Peter Junker
- Department of Rheumatology, Odense University Hospital, 5000 Odense, Denmark;
| | - Vibe Skov
- Department of Hematology, Zealand University Hospital, 4000 Roskilde, Denmark; (V.S.); (L.K.); (T.A.K.); (M.K.L.)
| | - Lasse Kjær
- Department of Hematology, Zealand University Hospital, 4000 Roskilde, Denmark; (V.S.); (L.K.); (T.A.K.); (M.K.L.)
| | - Trine A. Knudsen
- Department of Hematology, Zealand University Hospital, 4000 Roskilde, Denmark; (V.S.); (L.K.); (T.A.K.); (M.K.L.)
| | - Morten Kranker Larsen
- Department of Hematology, Zealand University Hospital, 4000 Roskilde, Denmark; (V.S.); (L.K.); (T.A.K.); (M.K.L.)
| | - Morten Orebo Holmström
- National Center for Cancer Immune Therapy, Herlev Hospital, 2730 Herlev, Denmark; (M.O.H.); (M.H.A.)
| | - Mads Hald Andersen
- National Center for Cancer Immune Therapy, Herlev Hospital, 2730 Herlev, Denmark; (M.O.H.); (M.H.A.)
| | - Christina Jensen
- Nordic Bioscience A/S, 2730 Herlev, Denmark; (C.J.); (M.A.K.); (N.W.)
| | - Morten A. Karsdal
- Nordic Bioscience A/S, 2730 Herlev, Denmark; (C.J.); (M.A.K.); (N.W.)
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Kralova B, Sochorcova L, Song J, Jahoda O, Hlusickova Kapralova K, Prchal JT, Divoky V, Horvathova M. Developmental changes in iron metabolism and erythropoiesis in mice with human gain-of-function erythropoietin receptor. Am J Hematol 2022; 97:1286-1299. [PMID: 35815815 DOI: 10.1002/ajh.26658] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 07/05/2022] [Indexed: 01/24/2023]
Abstract
Iron availability for erythropoiesis is controlled by the iron-regulatory hormone hepcidin. Increased erythropoiesis negatively regulates hepcidin synthesis by erythroferrone (ERFE), a hormone produced by erythroid precursors in response to erythropoietin (EPO). The mechanisms coordinating erythropoietic activity with iron homeostasis in erythrocytosis with low EPO are not well defined as exemplified by dominantly inherited (heterozygous) gain-of-function mutation of human EPO receptor (mtHEPOR) with low EPO characterized by postnatal erythrocytosis. We previously created a mouse model of this mtHEPOR that develops fetal erythrocytosis with a transient perinatal amelioration of erythrocytosis and its reappearance at 3-6 weeks of age. Prenatally and perinatally, mtHEPOR heterozygous and homozygous mice (differing in erythrocytosis severity) had increased Erfe transcripts, reduced hepcidin, and iron deficiency. Epo was transiently normal in the prenatal life; then decreased at postnatal day 7, and remained reduced in adulthood. Postnatally, hepcidin increased in mtHEPOR heterozygotes and homozygotes, accompanied by low Erfe induction and iron accumulation. With aging, the old, especially mtHEPOR homozygotes had a decline of erythropoiesis, myeloid expansion, and local bone marrow inflammatory stress. In addition, mtHEPOR erythrocytes had a reduced lifespan. This, together with reduced iron demand for erythropoiesis, due to its age-related attenuation, likely contributes to increased iron deposition in the aged mtHEPOR mice. In conclusion, the erythroid drive-mediated inhibition of hepcidin production in mtHEPOR mice in the prenatal/perinatal period is postnatally abrogated by increasing iron stores promoting hepcidin synthesis. The differences observed in studied characteristics between mtHEPOR heterozygotes and homozygotes suggest dose-dependent alterations of downstream EPOR stimulation.
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Affiliation(s)
- Barbora Kralova
- Department of Biology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Lucie Sochorcova
- Department of Biology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Jihyun Song
- Division of Hematology & Hematologic Malignancies, The University of Utah School of Medicine, Salt Lake City, Utah, USA
| | - Ondrej Jahoda
- Department of Biology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | | | - Josef T Prchal
- Division of Hematology & Hematologic Malignancies, The University of Utah School of Medicine, Salt Lake City, Utah, USA
| | - Vladimir Divoky
- Department of Biology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Monika Horvathova
- Department of Biology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
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Zhan H, Kaushansky K. Megakaryocytes as the Regulator of the Hematopoietic Vascular Niche. Front Oncol 2022; 12:912060. [PMID: 35814384 PMCID: PMC9258777 DOI: 10.3389/fonc.2022.912060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 05/09/2022] [Indexed: 11/13/2022] Open
Abstract
Megakaryocytes (MKs) are important components of the hematopoietic niche. Compared to the non-hematopoietic niche cells, MKs serving as part of the hematopoietic niche provides a mechanism for feedback regulation of hematopoietic stem cells (HSCs), in which HSC progeny (MKs) can modulate HSC adaptation to hematopoietic demands during both steady-state and stress hematopoiesis. MKs are often located adjacent to marrow sinusoids. Considering that most HSCs reside close to a marrow vascular sinusoid, as do MKs, the interactions between MKs and vascular endothelial cells are positioned to play important roles in modulating HSC function, and by extrapolation, might be dysregulated in various disease states. In this review, we discuss the interactions between MKs and the vascular niche in both normal and neoplastic hematopoiesis.
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Affiliation(s)
- Huichun Zhan
- Department of Medicine, Stony Brook School of Medicine, Stony Brook, NY, United States
- Medical Service, Northport Veterans Affairs (VA) Medical Center, Northport, NY, United States
- *Correspondence: Huichun Zhan,
| | - Kenneth Kaushansky
- Department of Medicine, Stony Brook School of Medicine, Stony Brook, NY, United States
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