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Mizrak D, Zhao Y, Feng H, Macaulay J, Tang Y, Sultan Z, Zhao G, Guo Y, Zhang J, Yang B, Eugene Chen Y. Single-Molecule Spatial Transcriptomics of Human Thoracic Aortic Aneurysms Uncovers Calcification-Related CARTPT-Expressing Smooth Muscle Cells. Arterioscler Thromb Vasc Biol 2023; 43:2285-2297. [PMID: 37823268 PMCID: PMC10842613 DOI: 10.1161/atvbaha.123.319329] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 09/28/2023] [Indexed: 10/13/2023]
Abstract
BACKGROUND Although single-cell RNA-sequencing is commonly applied to dissect the heterogeneity in human tissues, it involves the preparation of single-cell suspensions via cell dissociation, causing loss of spatial information. In this study, we employed high-resolution single-cell transcriptome imaging to reveal rare smooth muscle cell (SMC) types in human thoracic aortic aneurysm (TAA) tissue samples. METHODS Single-molecule spatial distribution of transcripts from 140 genes was analyzed in fresh-frozen human TAA samples with region and sex-matched controls. In vitro studies and tissue staining were performed to examine human CART prepropeptide (CARTPT) regulation and function. RESULTS We captured thousands of cells per sample including a spatially distinct CARTPT-expressing SMC subtype enriched in male TAA samples. Immunoassays confirmed human CART (cocaine- and amphetamine-regulated transcript) protein enrichment in male TAA tissue and truncated CARTPT secretion into cell culture medium. Oxidized low-density lipoprotein, a cardiovascular risk factor, induced CARTPT expression, whereas CARTPT overexpression in human aortic SMCs increased the expression of key osteochondrogenic transcription factors and reduced contractile gene expression. Recombinant human CART treatment of human SMCs further confirmed this phenotype. Alizarin red staining revealed calcium deposition in male TAA samples showing similar localization with human CART staining. CONCLUSIONS Here, we demonstrate the feasibility of single-molecule imaging in uncovering rare SMC subtypes in the diseased human aorta, a difficult tissue to dissociate. We identified a spatially distinct CARTPT-expressing SMC subtype enriched in male human TAA samples. Our functional studies suggest that human CART promotes osteochondrogenic switch of aortic SMCs, potentially leading to medial calcification of the thoracic aorta.
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Affiliation(s)
- Dogukan Mizrak
- Department of Cardiac Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Yang Zhao
- Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Hao Feng
- Department of Cardiac Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Jane Macaulay
- Department of Cardiac Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Ying Tang
- Department of Cardiac Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Zain Sultan
- Department of Cardiac Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Guizhen Zhao
- Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Yanhong Guo
- Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Jifeng Zhang
- Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Bo Yang
- Department of Cardiac Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
| | - Y. Eugene Chen
- Department of Cardiac Surgery, University of Michigan Medical Center, Ann Arbor, MI, USA
- Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA
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Huang T, Cheng J, Feng H, Zhou W, Qiu P, Zhou D, Yang D, Zhang J, Willer C, Chen YE, Mizrak D, Yang B. Bicuspid Aortic Valve-Associated Regulatory Regions Reveal GATA4 Regulation and Function During Human-Induced Pluripotent Stem Cell-Based Endothelial-Mesenchymal Transition-Brief Report. Arterioscler Thromb Vasc Biol 2023; 43:312-322. [PMID: 36519469 PMCID: PMC10038164 DOI: 10.1161/atvbaha.122.318566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 12/01/2022] [Indexed: 12/23/2022]
Abstract
BACKGROUND The endothelial-mesenchymal transition (EndoMT) is a fundamental process for heart valve formation and defects in EndoMT cause aortic valve abnormalities. Our previous genome-wide association study identified multiple variants in a large chromosome 8 segment as significantly associated with bicuspid aortic valve (BAV). The objective of this study is to determine the biological effects of this large noncoding segment in human induced pluripotent stem cell (hiPSC)-based EndoMT. METHODS A large genomic segment enriched for BAV-associated variants was deleted in hiPSCs using 2-step CRISPR/Cas9 editing. To address the effects of the variants on GATA4 expression, we generated CRISPR repression hiPSC lines (CRISPRi) as well as hiPSCs from BAV patients. The resulting hiPSCs were differentiated to mesenchymal/myofibroblast-like cells through cardiovascular-lineage endothelial cells for molecular and cellular analysis. Single-cell RNA sequencing was also performed at different stages of EndoMT induction. RESULTS The large deletion impaired hiPSC-based EndoMT in multiple biallelic clones compared with their isogenic control. It also reduced GATA4 transcript and protein levels during EndoMT, sparing the other genes nearby the deletion segment. Single-cell trajectory analysis revealed the molecular reprogramming during EndoMT. Putative GATA-binding protein targets during EndoMT were uncovered, including genes implicated in endocardial cushion formation and EndoMT process. Differentiation of cells derived from BAV patients carrying the rs117430032 variant as well as CRISPRi repression of the rs117430032 locus resulted in lower GATA4 expression in a stage-specific manner. TWIST1 was identified as a potential regulator of GATA4 expression, showing specificity to the locus tagged by rs117430032. CONCLUSIONS BAV-associated distal regions regulate GATA4 expression during hiPSC-based EndoMT, which in turn promotes EndoMT progression, implicating its contribution to heart valve development.
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Affiliation(s)
- Tingting Huang
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Jiaxi Cheng
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Hao Feng
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Wei Zhou
- Analytic and Translational Genetics Unit, Massachusetts General Hospital, Boston, MA, USA
| | - Ping Qiu
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Dong Zhou
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Dongshan Yang
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Jifeng Zhang
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Cristen Willer
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Y. Eugene Chen
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Dogukan Mizrak
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Bo Yang
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA
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Abstract
Thoracic aortic aneurysm is a life-threatening condition caused by weakening of the thoracic aorta wall, often developing silently until dissection or rupture occurs. Despite substantial efforts in the past decade, there have been no significant therapeutic advances to prevent or clinically manage diverse forms of thoracic aortic aneurysm and dissection with the only effective treatment being surgical repair. There is an urgent need to understand intra- and inter-aneurysmal heterogeneity underlying thoracic aortic aneurysm and dissection pathogenesis. The human aortic wall consists of many cell types and exhibits significant regional heterogeneity. High-throughput single-cell RNA sequencing has emerged as the principal tool to reveal the complexity in human tissues and clinical specimens. Recent single-cell RNA sequencing studies of different aortic cell populations both in vivo and in vitro began to dissect this complexity and have provided valuable information. In this review, we summarize these findings and discuss the potential applications of single-cell transcriptomics and related high-content technologies in human thoracic aortic aneurysm and dissection research, as well as the challenges associated with it.
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Affiliation(s)
- Dogukan Mizrak
- Department of Cardiac Surgery, University of Michigan, Ann Arbor (D.M., H.F., B.Y.)
| | - Hao Feng
- Department of Cardiac Surgery, University of Michigan, Ann Arbor (D.M., H.F., B.Y.).,Xiangya School of Medicine, Central South University, Changsha, China (H.F.)
| | - Bo Yang
- Department of Cardiac Surgery, University of Michigan, Ann Arbor (D.M., H.F., B.Y.)
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Bayin NS, Mizrak D, Stephen DN, Lao Z, Sims PA, Joyner AL. Injury-induced ASCL1 expression orchestrates a transitory cell state required for repair of the neonatal cerebellum. Sci Adv 2021; 7:eabj1598. [PMID: 34878841 PMCID: PMC8654303 DOI: 10.1126/sciadv.abj1598] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 10/20/2021] [Indexed: 05/23/2023]
Abstract
To understand repair processes, it is critical to identify the molecular foundations underlying progenitor diversity and plasticity. Upon injury to the neonatal cerebellum, a normally gliogenic nestin-expressing progenitor (NEP) in the Bergmann glia layer (BgL) undergoes adaptive reprograming to restore granule cell production. However, the cellular states and genes regulating the NEP fate switch are unknown. Using single-cell RNA sequencing and fate mapping, we defined molecular subtypes of NEPs and their lineages under homeostasis and repair. NEPs contain two major subtypes: Hopx+ astrogliogenic and Ascl1+ neurogenic NEPs that are further subdivided based on their location, lineage, and differentiation status. Upon injury, an Ascl1+ transitory cellular state arises from Hopx+ BgL-NEPs. Furthermore, mutational analysis revealed that induction of Ascl1 is required for adaptive reprogramming by orchestrating a glial-to-neural switch in vivo following injury. Thus, we provide molecular and cellular insights into context-dependent progenitor plasticity and repair mechanisms in the brain.
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Affiliation(s)
- N. Sumru Bayin
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, USA
| | - Dogukan Mizrak
- Department of Systems Biology, Columbia University, New York, NY, USA
| | - Daniel N. Stephen
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, USA
| | - Zhimin Lao
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, USA
| | - Peter A. Sims
- Department of Systems Biology, Columbia University, New York, NY, USA
- Department of Biochemistry and Biophysics, Columbia University, New York, NY, USA
| | - Alexandra L. Joyner
- Developmental Biology Program, Sloan Kettering Institute, New York, NY, USA
- Biochemistry, Cell and Molecular Biology Program, Weill Cornell Graduate School of Medical Sciences, New York, NY, USA
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5
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Zhou D, Feng H, Yang Y, Huang T, Qiu P, Zhang C, Olsen T, Zhang J, Chen YE, Mizrak D, Yang B. hiPSC Modeling of Lineage-Specific Smooth Muscle Cell Defects Caused by TGFBR1A230T Variant, and its Therapeutic Implications for Loeys-Dietz Syndrome. Circulation 2021; 144:1145-1159. [PMID: 34346740 DOI: 10.1161/circulationaha.121.054744] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Background: Loeys-Dietz Syndrome (LDS) is an inherited disorder predisposing individuals to thoracic aortic aneurysm and dissection (TAAD). Currently, there are no medical treatments except surgical resection. Although the genetic basis of LDS is well-understood, molecular mechanisms underlying the disease remain elusive impeding the development of a therapeutic strategy. In addition, aortic smooth muscle cells (SMC) have heterogenous embryonic origins depending on their spatial location, and lineage-specific effects of pathogenic variants on SMC function, likely causing regionally constrained LDS manifestations, have been unexplored. Methods: We identified an LDS family with a dominant pathogenic variant in TGFBR1 gene (TGFBR1A230T) causing aortic root aneurysm and dissection. To accurately model the molecular defects caused by this mutation, we used human-induced pluripotent stem cells (hiPSC) from subject with normal aorta to generate hiPSC carrying TGFBR1A230T, and corrected the mutation in patient-derived hiPSC using CRISPR-Cas9 gene editing. Following their lineage-specific SMC differentiation through cardiovascular progenitor cell (CPC) and neural crest stem cell (NCSC) lineages, we employed conventional molecular techniques and single-cell RNA-sequencing (scRNA-seq) to characterize the molecular defects. The resulting data led to subsequent molecular and functional rescue experiments employing Activin A and rapamycin. Results: Our results indicate the TGFBR1A230T mutation impairs contractile transcript and protein levels, and function in CPC-SMC, but not in NCSC-SMC. ScRNA-seq results implicate defective differentiation even in TGFBR1A230T/+ CPC-SMC including disruption of SMC contraction, and extracellular matrix formation. Comparison of patient-derived and mutation-corrected cells supported the contractile phenotype observed in the mutant CPC-SMC. TGFBR1A230T selectively disrupted SMAD3 and AKT activation in CPC-SMC, and led to increased cell proliferation. Consistently, scRNA-seq revealed molecular similarities between a loss-of-function SMAD3 mutation (SMAD3c.652delA/+) and TGFBR1A230T/+. Lastly, combination treatment with Activin A and rapamycin during or after SMC differentiation significantly improved the mutant CPC-SMC contractile gene expression, and function; and rescued the mechanical properties of mutant CPC-SMC tissue constructs. Conclusions: This study reveals that a pathogenic TGFBR1 variant causes lineage-specific SMC defects informing the etiology of LDS-associated aortic root aneurysm. As a potential pharmacological strategy, our results highlight a combination treatment with Activin A and rapamycin that can rescue the SMC defects caused by the variant.
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Affiliation(s)
- Dong Zhou
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI; Xiangya School of Medicine, Central South University, Changsha, PRC
| | - Hao Feng
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI; Xiangya School of Medicine, Central South University, Changsha, PRC
| | - Ying Yang
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI
| | - Tingting Huang
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI; Xiangya School of Medicine, Central South University, Changsha, PRC
| | - Ping Qiu
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI
| | - Chengxin Zhang
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI
| | - Timothy Olsen
- Department of Systems Biology, Columbia University, New York, NY
| | - Jifeng Zhang
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI
| | - Y Eugene Chen
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI; Department of Internal Medicine, University of Michigan, Ann Arbor, MI
| | - Dogukan Mizrak
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI
| | - Bo Yang
- Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI
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Delgado AC, Maldonado-Soto AR, Silva-Vargas V, Mizrak D, von Känel T, Tan KR, Paul A, Madar A, Cuervo H, Kitajewski J, Lin CS, Doetsch F. Release of stem cells from quiescence reveals gliogenic domains in the adult mouse brain. Science 2021; 372:1205-1209. [PMID: 34112692 DOI: 10.1126/science.abg8467] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 04/16/2021] [Indexed: 12/11/2022]
Abstract
Quiescent neural stem cells (NSCs) in the adult mouse ventricular-subventricular zone (V-SVZ) undergo activation to generate neurons and some glia. Here we show that platelet-derived growth factor receptor beta (PDGFRβ) is expressed by adult V-SVZ NSCs that generate olfactory bulb interneurons and glia. Selective deletion of PDGFRβ in adult V-SVZ NSCs leads to their release from quiescence, uncovering gliogenic domains for different glial cell types. These domains are also recruited upon injury. We identify an intraventricular oligodendrocyte progenitor derived from NSCs inside the brain ventricles that contacts supraependymal axons. Together, our findings reveal that the adult V-SVZ contains spatial domains for gliogenesis, in addition to those for neurogenesis. These gliogenic NSC domains tend to be quiescent under homeostasis and may contribute to brain plasticity.
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Affiliation(s)
| | | | | | - Dogukan Mizrak
- Department of Pathology and Cell Biology, Columbia University, New York, NY, USA
- Department of Systems Biology, Columbia University, New York, NY, USA
| | | | - Kelly R Tan
- Biozentrum, University of Basel, Basel, Switzerland
| | - Alex Paul
- Department of Genetics and Development, Columbia University, New York, NY, USA
| | - Aviv Madar
- Department of Biology, Center for Genomics and Systems Biology, New York University, New York, NY, USA
| | - Henar Cuervo
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL, USA
| | - Jan Kitajewski
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, IL, USA
| | - Chyuan-Sheng Lin
- Department of Pathology and Cell Biology, Columbia University, New York, NY, USA
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY, USA
| | - Fiona Doetsch
- Biozentrum, University of Basel, Basel, Switzerland.
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7
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Mizrak D, Bayin NS, Yuan J, Liu Z, Suciu RM, Niphakis MJ, Ngo N, Lum KM, Cravatt BF, Joyner AL, Sims PA. Single-Cell Profiling and SCOPE-Seq Reveal Lineage Dynamics of Adult Ventricular-Subventricular Zone Neurogenesis and NOTUM as a Key Regulator. Cell Rep 2021; 31:107805. [PMID: 32579931 PMCID: PMC7396151 DOI: 10.1016/j.celrep.2020.107805] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [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: 09/24/2019] [Revised: 05/13/2020] [Accepted: 06/02/2020] [Indexed: 12/14/2022] Open
Abstract
In the adult ventricular-subventricular zone (V-SVZ), neural stem cells (NSCs) generate new olfactory bulb (OB) neurons and glia throughout life. To map adult neuronal lineage progression, we profiled >56,000 V-SVZ and OB cells by single-cell RNA sequencing (scRNA-seq). Our analyses reveal the molecular diversity of OB neurons, including fate-mapped neurons, lineage progression dynamics, and an NSC intermediate enriched for Notum, which encodes a secreted WNT antagonist. SCOPE-seq technology, which links live-cell imaging with scRNA-seq, uncovers cell-size transitions during NSC differentiation and preferential NOTUM binding to proliferating neuronal precursors. Consistently, application of NOTUM protein in slice cultures and pharmacological inhibition of NOTUM in slice cultures and in vivo demonstrated that NOTUM negatively regulates V-SVZ proliferation. Timely, context-dependent neurogenesis demands adaptive signaling among neighboring progenitors. Our findings highlight a critical regulatory state during NSC activation marked by NOTUM, which attenuates WNT-stimulated proliferation in NSC progeny.
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Affiliation(s)
- Dogukan Mizrak
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - N Sumru Bayin
- Developmental Biology Program, Sloan Kettering Institute, New York, NY 10065, USA
| | - Jinzhou Yuan
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Zhouzerui Liu
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Radu M Suciu
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Micah J Niphakis
- Lundbeck La Jolla Research Center, Inc., 10835 Road to the Cure, Suite 250, San Diego, CA 92121, USA
| | - Nhi Ngo
- Lundbeck La Jolla Research Center, Inc., 10835 Road to the Cure, Suite 250, San Diego, CA 92121, USA
| | - Kenneth M Lum
- Lundbeck La Jolla Research Center, Inc., 10835 Road to the Cure, Suite 250, San Diego, CA 92121, USA
| | - Benjamin F Cravatt
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Alexandra L Joyner
- Developmental Biology Program, Sloan Kettering Institute, New York, NY 10065, USA; Biochemistry, Cell and Molecular Biology Program, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA
| | - Peter A Sims
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032, USA; Department of Biochemistry & Molecular Biophysics, Columbia University Irving Medical Center, New York, NY 10032, USA.
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8
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Mizrak D, Levitin HM, Delgado AC, Crotet V, Yuan J, Chaker Z, Silva-Vargas V, Sims PA, Doetsch F. Single-Cell Analysis of Regional Differences in Adult V-SVZ Neural Stem Cell Lineages. Cell Rep 2020; 26:394-406.e5. [PMID: 30625322 PMCID: PMC6368857 DOI: 10.1016/j.celrep.2018.12.044] [Citation(s) in RCA: 120] [Impact Index Per Article: 30.0] [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: 03/19/2018] [Revised: 11/20/2018] [Accepted: 12/11/2018] [Indexed: 12/23/2022] Open
Abstract
The ventricular-subventricular zone (V-SVZ) harbors adult neural stem cells. V-SVZ neural stem cells exhibit features of astrocytes, have a regional identity, and depending on their location in the lateral or septal wall of the lateral ventricle, generate different types of neuronal and glial progeny. We performed large-scale single-cell RNA sequencing to provide a molecular atlas of cells from the lateral and septal adult V-SVZ of male and female mice. This revealed regional and sex differences among adult V-SVZ cells. We uncovered lineage potency bias at the single-cell level among lateral and septal wall astrocytes toward neurogenesis and oligodendrogenesis, respectively. Finally, we identified transcription factor co-expression modules marking key temporal steps in neurogenic and oligodendrocyte lineage progression. Our data suggest functionally important spatial diversity in neurogenesis and oligodendrogenesis in the adult brain and reveal molecular correlates of adult NSC dormancy and lineage specialization. Mizrak et al. performed large-scale, single-cell RNA sequencing of the adult ventricular-subventricular zone neural stem cell niche. They identify regional differences between the lateral wall and septal wall, as well as sex differences in cell types and signaling pathways.
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Affiliation(s)
- Dogukan Mizrak
- Department of Systems Biology, Columbia University Medical Center, New York, NY 10032, USA; Department of Pathology and Cell Biology, Columbia University Medical Center, New York, NY 10032, USA
| | - Hanna Mendes Levitin
- Department of Systems Biology, Columbia University Medical Center, New York, NY 10032, USA
| | - Ana C Delgado
- Biozentrum, University of Basel, 4056 Basel, Switzerland
| | - Valerie Crotet
- Biozentrum, University of Basel, 4056 Basel, Switzerland
| | - Jinzhou Yuan
- Department of Systems Biology, Columbia University Medical Center, New York, NY 10032, USA
| | - Zayna Chaker
- Biozentrum, University of Basel, 4056 Basel, Switzerland
| | | | - Peter A Sims
- Department of Systems Biology, Columbia University Medical Center, New York, NY 10032, USA; Sulzberger Columbia Genome Center, Columbia University Medical Center, New York, NY 10032, USA; Department of Biochemistry & Molecular Biophysics, Columbia University Medical Center, New York, NY 10032, USA.
| | - Fiona Doetsch
- Biozentrum, University of Basel, 4056 Basel, Switzerland.
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Silva-Vargas V, Maldonado-Soto AR, Mizrak D, Codega P, Doetsch F. Age-Dependent Niche Signals from the Choroid Plexus Regulate Adult Neural Stem Cells. Cell Stem Cell 2016; 19:643-652. [PMID: 27452173 DOI: 10.1016/j.stem.2016.06.013] [Citation(s) in RCA: 202] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 05/04/2016] [Accepted: 06/20/2016] [Indexed: 10/21/2022]
Abstract
Specialized niches support the lifelong maintenance and function of tissue-specific stem cells. Adult neural stem cells in the ventricular-subventricular zone (V-SVZ) contact the cerebrospinal fluid (CSF), which flows through the lateral ventricles. A largely ignored component of the V-SVZ stem cell niche is the lateral ventricle choroid plexus (LVCP), a primary producer of CSF. Here we show that the LVCP, in addition to performing important homeostatic support functions, secretes factors that promote colony formation and proliferation of purified quiescent and activated V-SVZ stem cells and transit-amplifying cells. The functional effect of the LVCP secretome changes throughout the lifespan, with activated neural stem cells being especially sensitive to age-related changes. Transcriptome analysis identified multiple factors that recruit colony formation and highlights novel facets of LVCP function. Thus, the LVCP is a key niche compartment that translates physiological changes into molecular signals directly affecting neural stem cell behavior.
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Affiliation(s)
- Violeta Silva-Vargas
- Biozentrum, University of Basel, 4056 Basel, Switzerland; Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | | | - Dogukan Mizrak
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Paolo Codega
- Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA
| | - Fiona Doetsch
- Biozentrum, University of Basel, 4056 Basel, Switzerland; Department of Pathology and Cell Biology, Columbia University, New York, NY 10032, USA; Department of Neuroscience, Columbia University, New York, NY 10032, USA.
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Mizrak D, Ozturk B, Kubilay P, Akbulut H, Onur H. P170 Serum levels of CEA and CA 15-3 in different subtypes of recurrent breast cancer. Breast 2015. [DOI: 10.1016/s0960-9776(15)70211-0] [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: 11/28/2022] Open
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11
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Mizrak D, Ozturk B, Kubilay P, Akbulut H, Onur H. P279 More prognostic factors in early stage breast cancer. Breast 2015. [DOI: 10.1016/s0960-9776(15)70311-5] [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: 11/24/2022] Open
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12
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Mizrak D, Onur H, Ozturk B, Kubilay P, Akbulut H. P276 Effect of tumor hormonal and HER2 status on localization of metastases in recurrent breast cancer. Breast 2015. [DOI: 10.1016/s0960-9776(15)70308-5] [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: 10/23/2022] Open
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13
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Mizrak D, Kubilay P, Ozturk B, Onur H, Akbulut H. P167 Preoperative systemic therapy for locally advanced breast cancer: single center experience. Breast 2015. [DOI: 10.1016/s0960-9776(15)70208-0] [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] Open
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14
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Alkan A, Mizrak D, Utkan G. Nutritional Status of Hospitalized Cancer Patients. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu356.57] [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: 11/14/2022] Open
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Abstract
Although the intracellular molecular clocks that regulate circadian (~24 h) behavioral rhythms are well understood, it remains unclear how molecular clock information is transduced into rhythmic neuronal activity that in turn drives behavioral rhythms. To identify potential clock outputs, the authors generated expression profiles from a homogeneous population of purified pacemaker neurons (LN(v)s) from wild-type and clock mutant Drosophila. They identified a group of genes with enriched expression in LN(v)s and a second group of genes rhythmically expressed in LN(v)s in a clock-dependent manner. Only 10 genes fell into both groups: 4 core clock genes, including period (per) and timeless (tim), and 6 genes previously unstudied in circadian rhythms. The authors focused on one of these 6 genes, Ir, which encodes an inward rectifier K(+) channel likely to regulate resting membrane potential, whose expression peaks around dusk. Reducing Ir expression in LN(v)s increased larval light avoidance and lengthened the period of adult locomotor rhythms, consistent with increased LN(v) excitability. In contrast, increased Ir expression made many adult flies arrhythmic and dampened PER protein oscillations. The authors propose that rhythmic Ir expression contributes to daily rhythms in LN(v) neuronal activity, which in turn feed back to regulate molecular clock oscillations.
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Affiliation(s)
- Marc Ruben
- Department of Biology, New York University, New York, NY 10003, USA
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Mizrak D, Ruben M, Myers GN, Rhrissorrakrai K, Gunsalus KC, Blau J. Electrical activity can impose time of day on the circadian transcriptome of pacemaker neurons. Curr Biol 2012; 22:1871-80. [PMID: 22940468 DOI: 10.1016/j.cub.2012.07.070] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 06/29/2012] [Accepted: 07/31/2012] [Indexed: 11/30/2022]
Abstract
BACKGROUND Circadian (∼24 hr) rhythms offer one of the best examples of how gene expression is tied to behavior. Circadian pacemaker neurons contain molecular clocks that control 24 hr rhythms in gene expression that in turn regulate electrical activity rhythms to control behavior. RESULTS Here we demonstrate the inverse relationship: there are broad transcriptional changes in Drosophila clock neurons (LN(v)s) in response to altered electrical activity, including a large set of circadian genes. Hyperexciting LN(v)s creates a morning-like expression profile for many circadian genes while hyperpolarization leads to an evening-like transcriptional state. The electrical effects robustly persist in per(0) mutant LN(v)s but not in cyc(0) mutant LN(v)s, suggesting that neuronal activity interacts with the transcriptional activators of the core circadian clock. Bioinformatic and immunocytochemical analyses suggest that CREB family transcription factors link LN(v) electrical state to circadian gene expression. CONCLUSIONS The electrical state of a clock neuron can impose time of day to its transcriptional program. We propose that this acts as an internal zeitgeber to add robustness and precision to circadian behavioral rhythms.
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Affiliation(s)
- Dogukan Mizrak
- Department of Biology, New York University, 100 Washington Square East, New York, NY 10003, USA
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Blau J, Blanchard F, Collins B, Dahdal D, Knowles A, Mizrak D, Ruben M. What is there left to learn about the Drosophila clock? Cold Spring Harb Symp Quant Biol 2008; 72:243-50. [PMID: 18419281 DOI: 10.1101/sqb.2007.72.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Circadian rhythms offer probably the best understanding of how genes control behavior, and much of this understanding has come from studies in Drosophila. More recently, genetic manipulation of clock neurons in Drosophila has helped identify how daily patterns of activity are programmed by different clock neuron groups. Here, we review some of the more recent findings on the fly molecular clock and ask what more the fly model can offer to circadian biologists.
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Affiliation(s)
- J Blau
- Department of Biology, New York University, New York, New York 10003, USA
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Idilman R, Mizrak D, Corapcioglu D, Bektas M, Doganay B, Sayki M, Coban S, Erden E, Soykan I, Emral R, Uysal AR, Ozden A. Clinical trial: insulin-sensitizing agents may reduce consequences of insulin resistance in individuals with non-alcoholic steatohepatitis. Aliment Pharmacol Ther 2008; 28:200-8. [PMID: 18445142 DOI: 10.1111/j.1365-2036.2008.03723.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Currently, although only a few therapies normalize the liver test abnormalities with/without improving the liver histology, no pharmacologic therapy has proved to be effective for the treatment of non-alcoholic steatohepatitis. AIM To investigate the role of insulin sensitizers in the treatment of individuals with non-alcoholic steatohepatitis (NASH). METHODS A total of 74 individuals with NASH (male/female, 44/30; mean age, 47.2 +/- 9.0 years) were enrolled. Participants were divided into two distinct groups: group 1 (n = 25) participants were administered a conventional diet and exercise programme while those in group 2 (n = 49) were administered the diet and exercise programme plus insulin sensitizers. RESULTS With respect to baseline metabolic, biochemical and histological parameters, no significant differences were observed between the two groups (P > 0.05). Insulin sensitizers significantly improved metabolic parameters (homeostasis model assessment-insulin resistance score, P < 0.05), serum aminotransferase levels [aspartate aminotransferase (AST): 45.9 +/- 24.2 to 33.3 +/- 17.7 IU/L, P < 0.01; alanine aminotransferase (ALT): 78.2 +/- 46.3 to 47.3 +/- 34.5 IU/L, P < 0.001] and histological features (median non-alcoholic fatty liver disease activity score: 5.0-3.0, P = 0.01), while diet and exercise improved serum aminotransferase levels (AST: 39.3 +/- 11.1 to 30.0 +/- 8.6 IU/L, P < 0.01; ALT: 66.9 +/- 28.9 to 42.0 +/- 16.2 IU/L, P < 0.001) at the end of the 48 weeks when compared to baseline. Insulin sensitizers improved the high-sensitivity C-reactive protein levels (P < 0.01). No serious adverse effects of insulin sensitizers were observed. CONCLUSION Insulin sensitizers can lead to improvement in metabolic, biochemical and histological abnormalities of NASH as a result of improved insulin sensitivity.
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Affiliation(s)
- R Idilman
- Department of Gastroenterology, Ankara University Faculty of Medicine, Ankara, Turkey.
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Abstract
CD133 (prominin-1) was the first in a class of novel pentaspan membrane proteins to be identified in both humans and mice, and was originally classified as a marker of primitive haematopoietic and neural stem cells. Due to the highly restricted expression of CD133 family molecules on plasma membrane protrusions of epithelial and other cell types, in association with membrane cholesterol, a role in the organization of plasma membrane topology has also recently been assigned to this family. Studies have now confirmed the utility of CD133 as a marker of haematopoietic stem cells for human allogeneic transplantation. In addition, CD133 represents a marker of tumour-initiating cells in a number of human cancers, and therefore it may be possible to develop future therapies towards targeting cancer stem cells via this marker. The development of such therapies will be aided by a clearer understanding of the molecular mechanisms and signalling pathways that regulate the behaviour of CD133-expressing cells, and new data outlining the role of Wnt, Notch, and bone morphogenetic protein (BMP) signalling in CD133(+) cancer stem cell regulation are discussed within.
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Affiliation(s)
- D Mizrak
- Centre for Diabetes and Metabolic Medicine, Queen Mary's School of Medicine and Dentistry, Institute of Cell and Molecular Science, Whitechapel, London, UK
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