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Berger BS, Acebron SP, Herbst J, Koch S, Niehrs C. Parkinson's disease-associated receptor GPR37 is an ER chaperone for LRP6. EMBO Rep 2017; 18:712-725. [PMID: 28341812 DOI: 10.15252/embr.201643585] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 02/14/2017] [Accepted: 02/22/2017] [Indexed: 11/09/2022] Open
Abstract
Wnt/β-catenin signaling plays a key role in embryonic development, stem cell biology, and neurogenesis. However, the mechanisms of Wnt signal transmission, notably how the receptors are regulated, remain incompletely understood. Here we describe that the Parkinson's disease-associated receptor GPR37 functions in the maturation of the N-terminal bulky β-propellers of the Wnt co-receptor LRP6. GPR37 is required for Wnt/β-catenin signaling and protects LRP6 from ER-associated degradation via CHIP (carboxyl terminus of Hsc70-interacting protein) and the ATPase VCP GPR37 is highly expressed in neural progenitor cells (NPCs) where it is required for Wnt-dependent neurogenesis. We conclude that GPR37 is crucial for cellular protein quality control during Wnt signaling.
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Affiliation(s)
- Birgit S Berger
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Sergio P Acebron
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Jessica Herbst
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Stefan Koch
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Christof Niehrs
- Division of Molecular Embryology, DKFZ-ZMBH Alliance, Heidelberg, Germany .,Institute of Molecular Biology, Mainz, Germany
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Fraser ST, Midwinter RG, Coupland LA, Kong S, Berger BS, Yeo JH, Andrade OC, Cromer D, Suarna C, Lam M, Maghzal GJ, Chong BH, Parish CR, Stocker R. Heme oxygenase-1 deficiency alters erythroblastic island formation, steady-state erythropoiesis and red blood cell lifespan in mice. Haematologica 2015; 100:601-10. [PMID: 25682599 DOI: 10.3324/haematol.2014.116368] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 02/10/2015] [Indexed: 12/15/2022] Open
Abstract
Heme oxygenase-1 is critical for iron recycling during red blood cell turnover, whereas its impact on steady-state erythropoiesis and red blood cell lifespan is not known. We show here that in 8- to 14-week old mice, heme oxygenase-1 deficiency adversely affects steady-state erythropoiesis in the bone marrow. This is manifested by a decrease in Ter-119(+)-erythroid cells, abnormal adhesion molecule expression on macrophages and erythroid cells, and a greatly diminished ability to form erythroblastic islands. Compared with wild-type animals, red blood cell size and hemoglobin content are decreased, while the number of circulating red blood cells is increased in heme oxygenase-1 deficient mice, overall leading to microcytic anemia. Heme oxygenase-1 deficiency increases oxidative stress in circulating red blood cells and greatly decreases the frequency of macrophages expressing the phosphatidylserine receptor Tim4 in bone marrow, spleen and liver. Heme oxygenase-1 deficiency increases spleen weight and Ter119(+)-erythroid cells in the spleen, although α4β1-integrin expression by these cells and splenic macrophages positive for vascular cell adhesion molecule 1 are both decreased. Red blood cell lifespan is prolonged in heme oxygenase-1 deficient mice compared with wild-type mice. Our findings suggest that while macrophages and relevant receptors required for red blood cell formation and removal are substantially depleted in heme oxygenase-1 deficient mice, the extent of anemia in these mice may be ameliorated by the prolonged lifespan of their oxidatively stressed erythrocytes.
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Affiliation(s)
- Stuart T Fraser
- Laboratory for Blood Cell Development, School of Medical Sciences (Physiology, Anatomy & Histology), Sydney Medical School, The University of Sydney, Australia
| | - Robyn G Midwinter
- Centre for Vascular Research, School of Medical Sciences (Pathology) and Bosch Institute, The University of Sydney, Australia
| | - Lucy A Coupland
- The John Curtin School of Medical Research, The Australian National University, Canberra, Australia
| | - Stephanie Kong
- Vascular Biology Division, Victor Chang Cardiac Research Institute, Darlinghurst, Australia
| | - Birgit S Berger
- Centre for Vascular Research, School of Medical Sciences (Pathology) and Bosch Institute, The University of Sydney, Australia
| | - Jia Hao Yeo
- Laboratory for Blood Cell Development, School of Medical Sciences (Physiology, Anatomy & Histology), Sydney Medical School, The University of Sydney, Australia
| | - Osvaldo Cooley Andrade
- Laboratory for Blood Cell Development, School of Medical Sciences (Physiology, Anatomy & Histology), Sydney Medical School, The University of Sydney, Australia
| | - Deborah Cromer
- Complex Systems in Biology Group, Centre for Vascular Research, University of New South Wales, Kensington, Australia
| | - Cacang Suarna
- Centre for Vascular Research, School of Medical Sciences (Pathology) and Bosch Institute, The University of Sydney, Australia Vascular Biology Division, Victor Chang Cardiac Research Institute, Darlinghurst, Australia
| | - Magda Lam
- Centre for Vascular Research, School of Medical Sciences (Pathology) and Bosch Institute, The University of Sydney, Australia Vascular Biology Division, Victor Chang Cardiac Research Institute, Darlinghurst, Australia
| | - Ghassan J Maghzal
- Centre for Vascular Research, School of Medical Sciences (Pathology) and Bosch Institute, The University of Sydney, Australia Vascular Biology Division, Victor Chang Cardiac Research Institute, Darlinghurst, Australia School of Medical Sciences, Faculty of Medicine, University of New South Wales, Kensington
| | - Beng H Chong
- Department of Medicine, St George Clinical School, University of New South Wales, Kogarah, Australia
| | - Christopher R Parish
- The John Curtin School of Medical Research, The Australian National University, Canberra, Australia
| | - Roland Stocker
- Centre for Vascular Research, School of Medical Sciences (Pathology) and Bosch Institute, The University of Sydney, Australia Vascular Biology Division, Victor Chang Cardiac Research Institute, Darlinghurst, Australia School of Medical Sciences, Faculty of Medicine, University of New South Wales, Kensington
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