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Deppmann CD, Zunder ER. The good, the bald, and the hairy: A mechanosensor meets its fate at the target. Dev Cell 2023; 58:2013-2014. [PMID: 37875070 DOI: 10.1016/j.devcel.2023.08.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 08/21/2022] [Revised: 08/23/2023] [Accepted: 08/24/2023] [Indexed: 10/26/2023]
Abstract
In this issue of Developmental Cell, Koutsioumpa et al. (2023) investigate the maturation of low-threshold mechanoreceptor nerve endings in both hairy and glabrous skin types and discover a critical role for target-derived BMP in the development of Meissner corpuscles in glabrous (i.e., hairless) skin.
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Affiliation(s)
- Christopher D Deppmann
- Department of Biology, College of Arts and Sciences, Charlottesville, VA 22902, USA; Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA 229022, USA; Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA 22902, USA; Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 229022, USA; Department of Cell Biology, School of Medicine, University of Virginia, Charlottesville, VA 229022, USA; Program in Fundamental Neuroscience, College of Arts and Sciences, Charlottesville, VA 22902, USA.
| | - Eli R Zunder
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA 229022, USA; Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA 22902, USA.
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2
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Vradenburgh SA, Van Deusen AL, Beachum AN, Moats JM, Hirt AK, Deppmann CD, Keeler AB, Zunder ER. Sexual dimorphism in the dorsal root ganglia of neonatal mice identified by protein expression profiling with single-cell mass cytometry. Mol Cell Neurosci 2023; 126:103866. [PMID: 37263459 DOI: 10.1016/j.mcn.2023.103866] [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: 02/01/2023] [Revised: 05/08/2023] [Accepted: 05/25/2023] [Indexed: 06/03/2023] Open
Abstract
Development of neuronal and glial populations in the dorsal root ganglia (DRG) is required for detection of touch, body position, temperature, and noxious stimuli. While female-male differences in somatosensory perception have been previously reported, no study has examined global sex differences in the abundance of DRG cell types, and the developmental origin of these differences has not been characterized. To investigate whether sex-specific differences in neuronal and glial cell types arise in the DRG during development, we performed single-cell mass cytometry analysis on sex-separated DRGs from 4 separate litter replicates of postnatal day 0 (P0) C57/BL6 mouse pups. In this analysis, we observed that females had a higher abundance of total neurons (p = 0.0266), as well as an increased abundance of TrkB+ (p = 0.031) and TrkC+ (p = 0.04) neurons for mechanoreception and proprioception, while males had a higher abundance of TrkA+ (p = 0.025) neurons for thermoreception and nociception. Pseudotime comparison of the female and male datasets indicates that male neurons are more mature and differentiated than female neurons at P0. These findings warrant further studies to determine whether these differences are maintained across development, and their impact on somatosensory perception.
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Affiliation(s)
- Shayla A Vradenburgh
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA 22902, United States of America; Department of Biology, College of Arts and Sciences, Charlottesville, VA 22902, United States of America
| | - Amy L Van Deusen
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA 22902, United States of America; Department of Biology, College of Arts and Sciences, Charlottesville, VA 22902, United States of America
| | - Allison N Beachum
- Cell & Developmental Biology Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA 22902, United States of America
| | - Jacqueline M Moats
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA 22902, United States of America
| | - Ashley K Hirt
- Department of Biology, College of Arts and Sciences, Charlottesville, VA 22902, United States of America
| | - Christopher D Deppmann
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA 22902, United States of America; Department of Biology, College of Arts and Sciences, Charlottesville, VA 22902, United States of America; Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA 22903, United States of America; Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22902, United States of America; Department of Cell Biology, School of Medicine, University of Virginia, Charlottesville, VA 22902, United States of America; Program in Fundamental Neuroscience, College of Arts and Sciences, Charlottesville, VA 22902, United States of America
| | - Austin B Keeler
- Department of Biology, College of Arts and Sciences, Charlottesville, VA 22902, United States of America.
| | - Eli R Zunder
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA 22902, United States of America; Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA 22903, United States of America.
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3
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Tang Q, Godschall E, Brennan CD, Zhang Q, Abraham-Fan RJ, Williams SP, Güngül TB, Onoharigho R, Buyukaksakal A, Salinas R, Sajonia IR, Olivieri JJ, Calhan OY, Deppmann CD, Campbell JN, Podyma B, Güler AD. Leptin receptor neurons in the dorsomedial hypothalamus input to the circadian feeding network. Sci Adv 2023; 9:eadh9570. [PMID: 37624889 PMCID: PMC10456850 DOI: 10.1126/sciadv.adh9570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 07/25/2023] [Indexed: 08/27/2023]
Abstract
Salient cues, such as the rising sun or availability of food, entrain biological clocks for behavioral adaptation. The mechanisms underlying entrainment to food availability remain elusive. Using single-nucleus RNA sequencing during scheduled feeding, we identified a dorsomedial hypothalamus leptin receptor-expressing (DMHLepR) neuron population that up-regulates circadian entrainment genes and exhibits calcium activity before an anticipated meal. Exogenous leptin, silencing, or chemogenetic stimulation of DMHLepR neurons disrupts the development of molecular and behavioral food entrainment. Repetitive DMHLepR neuron activation leads to the partitioning of a secondary bout of circadian locomotor activity that is in phase with the stimulation and dependent on an intact suprachiasmatic nucleus (SCN). Last, we found a DMHLepR neuron subpopulation that projects to the SCN with the capacity to influence the phase of the circadian clock. This direct DMHLepR-SCN connection is well situated to integrate the metabolic and circadian systems, facilitating mealtime anticipation.
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Affiliation(s)
- Qijun Tang
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Elizabeth Godschall
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Charles D. Brennan
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Qi Zhang
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | | | - Sydney P. Williams
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Taha Buğra Güngül
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Roberta Onoharigho
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Aleyna Buyukaksakal
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Ricardo Salinas
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Isabelle R. Sajonia
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Joey J. Olivieri
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - O. Yipkin Calhan
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Christopher D. Deppmann
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
- Program in Fundamental Neuroscience, Charlottesville, VA 22904, USA
- Department of Cell Biology, University of Virginia, Charlottesville, VA 22904, USA
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22904, USA
- Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
| | - John N. Campbell
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
- Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
| | - Brandon Podyma
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
- Medical Scientist Training Program, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
| | - Ali D. Güler
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
- Program in Fundamental Neuroscience, Charlottesville, VA 22904, USA
- Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
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4
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Tang Q, Godschall E, Brennan CD, Zhang Q, Abraham-Fan RJ, Williams SP, Güngül TB, Onoharigho R, Buyukaksakal A, Salinas R, Olivieri JJ, Deppmann CD, Campbell JN, Podyma B, Güler AD. A leptin-responsive hypothalamic circuit inputs to the circadian feeding network. bioRxiv 2023:2023.02.24.529901. [PMID: 36865258 PMCID: PMC9980144 DOI: 10.1101/2023.02.24.529901] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Abstract
Salient cues, such as the rising sun or the availability of food, play a crucial role in entraining biological clocks, allowing for effective behavioral adaptation and ultimately, survival. While the light-dependent entrainment of the central circadian pacemaker (suprachiasmatic nucleus, SCN) is relatively well defined, the molecular and neural mechanisms underlying entrainment associated with food availability remains elusive. Using single nucleus RNA sequencing during scheduled feeding (SF), we identified a leptin receptor (LepR) expressing neuron population in the dorsomedial hypothalamus (DMH) that upregulates circadian entrainment genes and exhibits rhythmic calcium activity prior to an anticipated meal. We found that disrupting DMHLepR neuron activity had a profound impact on both molecular and behavioral food entrainment. Specifically, silencing DMHLepR neurons, mis-timed exogenous leptin administration, or mis-timed chemogenetic stimulation of these neurons all interfered with the development of food entrainment. In a state of energy abundance, repetitive activation of DMHLepR neurons led to the partitioning of a secondary bout of circadian locomotor activity that was in phase with the stimulation and dependent on an intact SCN. Lastly, we discovered that a subpopulation of DMHLepR neurons project to the SCN with the capacity to influence the phase of the circadian clock. This leptin regulated circuit serves as a point of integration between the metabolic and circadian systems, facilitating the anticipation of meal times.
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Affiliation(s)
- Qijun Tang
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Elizabeth Godschall
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Charles D. Brennan
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Qi Zhang
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | | | - Sydney P. Williams
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Taha Buğra Güngül
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Roberta Onoharigho
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Aleyna Buyukaksakal
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Ricardo Salinas
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Joey J. Olivieri
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
| | - Christopher D. Deppmann
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
- Program in Fundamental Neuroscience, Charlottesville, VA 22904, USA
- Department of Cell Biology, University of Virginia, Charlottesville, VA, 22904, USA
- Department Biomedical Engineering, University of Virginia, Charlottesville, VA, 22904, USA
- Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
| | - John N. Campbell
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
- Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
| | - Brandon Podyma
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
- Medical Scientist Training Program, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
| | - Ali D. Güler
- Department of Biology, University of Virginia, Charlottesville, VA 22904, USA
- Program in Fundamental Neuroscience, Charlottesville, VA 22904, USA
- Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22903, USA
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5
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Kumar S, Budhathoki S, Oliveira CB, Kahle AD, Calhan OY, Lukens JR, Deppmann CD. Role of the caspase-8/RIPK3 axis in Alzheimer's disease pathogenesis and Aβ-induced NLRP3 inflammasome activation. JCI Insight 2023; 8:157433. [PMID: 36602874 PMCID: PMC9977425 DOI: 10.1172/jci.insight.157433] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 12/27/2022] [Indexed: 01/06/2023] Open
Abstract
The molecular mediators of cell death and inflammation in Alzheimer's disease (AD) have yet to be fully elucidated. Caspase-8 is a critical regulator of several cell death and inflammatory pathways; however, its role in AD pathogenesis has not yet been examined in detail. In the absence of caspase-8, mice are embryonic lethal due to excessive receptor interacting protein kinase 3-dependent (RIPK3-dependent) necroptosis. Compound RIPK3 and caspase-8 mutants rescue embryonic lethality, which we leveraged to examine the roles of these pathways in an amyloid β-mediated (Aβ-mediated) mouse model of AD. We found that combined deletion of caspase-8 and RIPK3, but not RIPK3 alone, led to diminished Aβ deposition and microgliosis in the mouse model of AD carrying human presenilin 1 and amyloid precursor protein with 5 familial AD mutations (5xFAD). Despite its well-known role in cell death, caspase-8 did not appear to affect cell loss in the 5xFAD model. In contrast, we found that caspase-8 was a critical regulator of Aβ-driven inflammasome gene expression and IL-1β release. Interestingly, loss of RIPK3 had only a modest effect on disease progression, suggesting that inhibition of necroptosis or RIPK3-mediated cytokine pathways is not critical during midstages of Aβ amyloidosis. These findings suggest that therapeutics targeting caspase-8 may represent a novel strategy to limit Aβ amyloidosis and neuroinflammation in AD.
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Affiliation(s)
- Sushanth Kumar
- Department of Biology and,Neuroscience Graduate Program, School of Medicine, and
| | | | | | | | | | - John R. Lukens
- Neuroscience Graduate Program, School of Medicine, and,Center for Brain Immunology and Glia (BIG), Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, Virginia, USA
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6
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Keeler AB, Van Deusen AL, Gadani IC, Williams CM, Goggin SM, Hirt AK, Vradenburgh SA, Fread KI, Puleo EA, Jin L, Calhan OY, Deppmann CD, Zunder ER. A developmental atlas of somatosensory diversification and maturation in the dorsal root ganglia by single-cell mass cytometry. Nat Neurosci 2022; 25:1543-1558. [PMID: 36303068 PMCID: PMC10691656 DOI: 10.1038/s41593-022-01181-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 01/08/2022] [Accepted: 09/08/2022] [Indexed: 01/13/2023]
Abstract
Precisely controlled development of the somatosensory system is essential for detecting pain, itch, temperature, mechanical touch and body position. To investigate the protein-level changes that occur during somatosensory development, we performed single-cell mass cytometry on dorsal root ganglia from C57/BL6 mice of both sexes, with litter replicates collected daily from embryonic day 11.5 to postnatal day 4. Measuring nearly 3 million cells, we quantified 30 molecularly distinct somatosensory glial and 41 distinct neuronal states across all timepoints. Analysis of differentiation trajectories revealed rare cells that co-express two or more Trk receptors and over-express stem cell markers, suggesting that these neurotrophic factor receptors play a role in cell fate specification. Comparison to previous RNA-based studies identified substantial differences between many protein-mRNA pairs, demonstrating the importance of protein-level measurements to identify functional cell states. Overall, this study demonstrates that mass cytometry is a high-throughput, scalable platform to rapidly phenotype somatosensory tissues.
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Affiliation(s)
- Austin B Keeler
- Department of Biology, College of Arts and Sciences, Charlottesville, VA, USA
| | - Amy L Van Deusen
- Department of Biology, College of Arts and Sciences, Charlottesville, VA, USA
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA, USA
- Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA, USA
| | - Irene C Gadani
- Department of Biology, College of Arts and Sciences, Charlottesville, VA, USA
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA, USA
| | - Corey M Williams
- Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA, USA
| | - Sarah M Goggin
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA, USA
- Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA, USA
| | - Ashley K Hirt
- Department of Biology, College of Arts and Sciences, Charlottesville, VA, USA
| | - Shayla A Vradenburgh
- Department of Biology, College of Arts and Sciences, Charlottesville, VA, USA
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA, USA
| | - Kristen I Fread
- Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA, USA
| | - Emily A Puleo
- Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA, USA
| | - Lucy Jin
- Department of Biology, College of Arts and Sciences, Charlottesville, VA, USA
| | - O Yipkin Calhan
- Department of Biology, College of Arts and Sciences, Charlottesville, VA, USA
| | - Christopher D Deppmann
- Department of Biology, College of Arts and Sciences, Charlottesville, VA, USA.
- Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA, USA.
- Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA, USA.
- Department of Cell Biology, School of Medicine, University of Virginia, Charlottesville, VA, USA.
- Program in Fundamental Neuroscience, College of Arts and Sciences, Charlottesville, VA, USA.
| | - Eli R Zunder
- Neuroscience Graduate Program, School of Medicine, University of Virginia, Charlottesville, VA, USA.
- Department of Biomedical Engineering, School of Engineering, University of Virginia, Charlottesville, VA, USA.
- Program in Fundamental Neuroscience, College of Arts and Sciences, Charlottesville, VA, USA.
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Abstract
Metabolic disorders result from dysregulation of central nervous system and peripheral metabolic energy homeostatic pathways. To maintain normal energy balance, neural circuits must integrate feedforward and feedback signals from the internal metabolic environment to orchestrate proper food intake and energy expenditure. These signals include conserved meal and adipocyte cues such as glucose and leptin, respectively, in addition to more novel players including brain-derived neurotrophic factor (BDNF). In particular, BDNF's two receptors, tropomyosin related kinase B (TrkB) and p75 neurotrophin receptor (p75NTR), are increasingly appreciated to be involved in whole body energy homeostasis. At times, these two receptors even seem to functionally oppose one another's actions, providing the framework for a potential neurotrophin mediated energy regulatory axis, which we explore further here.
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Affiliation(s)
- Brandon Podyma
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA; Medical Scientist Training Program, School of Medicine, University of Virginia, Charlottesville, VA 22908-0738, USA.
| | - Kavya Parekh
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Ali D Güler
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
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8
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Pathak A, Clark S, Bronfman FC, Deppmann CD, Carter BD. Long-distance regressive signaling in neural development and disease. Wiley Interdiscip Rev Dev Biol 2021; 10:e382. [PMID: 32391977 PMCID: PMC7655682 DOI: 10.1002/wdev.382] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 03/23/2020] [Accepted: 04/06/2020] [Indexed: 02/06/2023]
Abstract
Nervous system development proceeds via well-orchestrated processes involving a balance between progressive and regressive events including stabilization or elimination of axons, synapses, and even entire neurons. These progressive and regressive events are driven by functionally antagonistic signaling pathways with the dominant pathway eventually determining whether a neural element is retained or removed. Many of these developmental sculpting events are triggered by final target innervation necessitating a long-distance mode of communication. While long-distance progressive signaling has been well characterized, particularly for neurotrophic factors, there remains relatively little known about how regressive events are triggered from a distance. Here we discuss the emergent phenomenon of long-distance regressive signaling pathways. In particular, we will cover (a) progressive and regressive cues known to be employed after target innervation, (b) the mechanisms of long-distance signaling from an endosomal platform, (c) recent evidence that long-distance regressive cues emanate from platforms like death receptors or repulsive axon guidance receptors, and (d) evidence that these pathways are exploited in pathological scenarios. This article is categorized under: Nervous System Development > Vertebrates: General Principles Signaling Pathways > Global Signaling Mechanisms Establishment of Spatial and Temporal Patterns > Cytoplasmic Localization.
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Affiliation(s)
- Amrita Pathak
- Department of Biochemistry and Vanderbilt Brain Institute, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Shayla Clark
- Neuroscience Graduate Program, University of Virginia, Charlottesville, Virginia
| | - Francisca C. Bronfman
- Institute of Biomedical Sciences (ICB), Faculty of Medicine, Faculty of Life Science, Universidad Andres Bello, Santiago, Chile
| | - Christopher D. Deppmann
- Departments of Biology, Cell Biology, Biomedical Engineering, and Neuroscience, University of Virginia, Charlottesville, Virginia
| | - Bruce D. Carter
- Department of Biochemistry and Vanderbilt Brain Institute, Vanderbilt University School of Medicine, Nashville, Tennessee
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9
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Podyma B, Johnson D, Sipe L, Battin K, Remcho P, Deppmann CD, Güler AD. SAT-602 Hypothalamic P75 Neurotrophin Receptor Regulates Homeostatic Feeding and Food Anticipation. J Endocr Soc 2020. [PMCID: PMC7208797 DOI: 10.1210/jendso/bvaa046.520] [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] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Proper circadian alignment of feeding behavior is necessary to prevent metabolic disease, and thus it is imperative to identify the neural circuits and molecular players that coordinate energy homeostasis. Neurotrophin signaling has been implicated in both metabolic and circadian processes, thereby representing a good candidate for regulating neural circuits driving time-of-day dependent feeding and foraging behavior. Here, we demonstrate that mice lacking the p75 neurotrophin receptor, p75NTR, have a behavioral defect in their ability to adequately respond to energy deficit. In response to fasting, p75KO mice (1) decrease their refeeding food intake compared to controls. Furthermore, following several days of restricted feeding, they (2) are unable to develop food anticipatory behavior (FAA), a phenomenon believed to be the output of a food-entrained circadian oscillator that has yet to be anatomically defined. Strikingly, these two phenotypes are observed only during the daytime, and not at night. These defects lead to increased weight loss, but do not appear to be mediated by changes in peripheral hormones. Notably, these effects are also independent of a role of p75NTR in development, as a global, adult-inducible p75NTR knockout recapitulates the feeding behavior of germline knockout mice. Rather, we demonstrate that p75NTR is discretely expressed in two hypothalamic regions known to be important for feeding behavior, the arcuate (ARC) and dorsomedial (DMH) hypothalamus. We find that p75KO mice have reduced fasting-induced activation of ARC, but not DMH, neurons. In addition, we show that ARC AgRP neuron p75NTR is necessary for fasting-induced refeeding and daytime FAA. We further suggest that AgRP-p75NTR is necessary to mediate AgRP neuron phospho-CREB signaling in response to energy deficit. Finally, given previous reports of involvement of the DMH in food anticipation, we asked whether DMH-p75NTR is necessary for feeding behavior and food anticipation. Strikingly, we find that p75NTR in the DMH is also necessary for FAA, but not for the control of homeostatic feeding. These data establish p75NTR as a novel regulator of energy homeostasis that acts to gate behavioral responses to food scarcity. It further posits that p75NTR may functionally link two independent hypothalamic regions to a time-of-day dependence of circadian food anticipation.
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Affiliation(s)
| | - Dove Johnson
- University of Virginia, Charlottesville, VA, USA
| | - Laura Sipe
- University of Virginia, Charlottesville, VA, USA
| | | | - Parks Remcho
- University of Virginia, Charlottesville, VA, USA
| | | | - Ali D Güler
- University of Virginia, Charlottesville, VA, USA
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10
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Grippo RM, Tang Q, Zhang Q, Chadwick SR, Gao Y, Altherr EB, Sipe L, Purohit AM, Purohit NM, Sunkara MD, Cios KJ, Sidikpramana M, Spano AJ, Campbell JN, Steele AD, Hirsh J, Deppmann CD, Wu M, Scott MM, Güler AD. Dopamine Signaling in the Suprachiasmatic Nucleus Enables Weight Gain Associated with Hedonic Feeding. Curr Biol 2020; 30:1352-1355. [PMID: 32259494 DOI: 10.1016/j.cub.2020.03.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Kuhn KD, Edamura K, Bhatia N, Cheng I, Clark SA, Haynes CV, Heffner DL, Kabir F, Velasquez J, Spano AJ, Deppmann CD, Keeler AB. Molecular dissection of TNFR-TNFα bidirectional signaling reveals both cooperative and antagonistic interactions with p75 neurotrophic factor receptor in axon patterning. Mol Cell Neurosci 2020; 103:103467. [PMID: 32004684 PMCID: PMC7682658 DOI: 10.1016/j.mcn.2020.103467] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 10/03/2019] [Revised: 12/18/2019] [Accepted: 01/13/2020] [Indexed: 11/25/2022] Open
Abstract
During neural development, complex organisms rely on progressive and regressive events whereby axons, synapses, and neurons are overproduced followed by selective elimination of a portion of these components. Tumor necrosis factor α (TNFα) together with its cognate receptor (Tumor necrosis factor receptor 1; TNFR1) have been shown to play both regressive (i.e. forward signaling from the receptor) and progressive (i.e. reverse signaling from the ligand) roles in sympathetic neuron development. In contrast, a paralog of TNFR1, p75 neurotrophic factor receptor (p75NTR) promotes mainly regressive developmental events in sympathetic neurons. Here we examine the interplay between these paralogous receptors in the regulation of axon branch elimination and arborization. We confirm previous reports that these TNFR1 family members are individually capable of promoting ligand-dependent suppression of axon growth and branching. Remarkably, p75NTR and TNFR1 physically interact and p75NTR requires TNFR1 for ligand-dependent axon suppression of axon branching but not vice versa. We also find that p75NTR forward signaling and TNFα reverse signaling are functionally antagonistic. Finally, we find that TNFα reverse signaling is necessary for nerve growth factor (NGF) dependent axon growth. Taken together these findings demonstrate several levels of synergistic and antagonistic interactions using very few signaling pathways and that the balance of these synergizing and opposing signals act to ensure proper axon growth and patterning.
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Affiliation(s)
- K D Kuhn
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - K Edamura
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - N Bhatia
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - I Cheng
- Neuroscience Graduate Program, University of Virginia, Charlottesville, VA 22903, USA
| | - S A Clark
- Neuroscience Graduate Program, University of Virginia, Charlottesville, VA 22903, USA
| | - C V Haynes
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - D L Heffner
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - F Kabir
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - J Velasquez
- Blue Ridge Virtual Governor's School, Palmyra, VA 22963, USA
| | - A J Spano
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - C D Deppmann
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA; Neuroscience Graduate Program, University of Virginia, Charlottesville, VA 22903, USA; Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22903, USA; Department of Cell Biology, University of Virginia, Charlottesville, VA 22903, USA.
| | - A B Keeler
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA.
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12
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Podyma B, Johnson DA, Sipe L, Remcho TP, Battin K, Liu Y, Yoon SO, Deppmann CD, Güler AD. The p75 neurotrophin receptor in AgRP neurons is necessary for homeostatic feeding and food anticipation. eLife 2020; 9:e52623. [PMID: 31995032 PMCID: PMC7056271 DOI: 10.7554/elife.52623] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 01/27/2020] [Indexed: 12/31/2022] Open
Abstract
Networks of neurons control feeding and activity patterns by integrating internal metabolic signals of energy balance with external environmental cues such as time-of-day. Proper circadian alignment of feeding behavior is necessary to prevent metabolic disease, and thus it is imperative that molecular players that maintain neuronal coordination of energy homeostasis are identified. Here, we demonstrate that mice lacking the p75 neurotrophin receptor, p75NTR, decrease their feeding and food anticipatory behavior (FAA) in response to daytime, but not nighttime, restricted feeding. These effects lead to increased weight loss, but do not require p75NTR during development. Instead, p75NTR is required for fasting-induced activation of neurons within the arcuate hypothalamus. Indeed, p75NTR specifically in AgRP neurons is required for FAA in response to daytime restricted feeding. These findings establish p75NTR as a novel regulator gating behavioral response to food scarcity and time-of-day dependence of circadian food anticipation.
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Affiliation(s)
- Brandon Podyma
- Department of BiologyUniversity of VirginiaCharlottesvilleUnited States
| | - Dove-Anna Johnson
- Department of BiologyUniversity of VirginiaCharlottesvilleUnited States
| | - Laura Sipe
- Department of BiologyUniversity of VirginiaCharlottesvilleUnited States
| | | | - Katherine Battin
- Department of BiologyUniversity of VirginiaCharlottesvilleUnited States
| | - Yuxi Liu
- Department of Biological Chemistry and PharmacologyThe Ohio State University College of MedicineColumbusUnited States
| | - Sung Ok Yoon
- Department of Biological Chemistry and PharmacologyThe Ohio State University College of MedicineColumbusUnited States
| | | | - Ali Deniz Güler
- Department of BiologyUniversity of VirginiaCharlottesvilleUnited States
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13
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Abstract
Signalling from the sympathetic nervous system of mice subjected to stress leads to the depletion of a stem-cell population in their hair follicles. This discovery sheds light on why stress turns hair prematurely grey.
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14
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Cheng I, Jin L, Rose LC, Deppmann CD. Temporally restricted death and the role of p75NTR as a survival receptor in the developing sensory nervous system. Dev Neurobiol 2018; 78:701-717. [PMID: 29569362 PMCID: PMC6023755 DOI: 10.1002/dneu.22591] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [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: 01/03/2018] [Revised: 02/26/2018] [Accepted: 03/16/2018] [Indexed: 11/05/2022]
Abstract
The peripheral somatosensory system overproduces neurons early in development followed by a period of cell death during final target innervation. The decision to survive or die in somatosensory neurons of the dorsal root ganglion (DRG) is mediated by target-derived neurotrophic factors and their cognate receptors. Subsets of peripheral somatosensory neurons can be crudely defined by the neurotrophic receptors that they express: peptidergic nociceptors (TrkA+), nonpeptidergic nociceptors (Ret+), mechanoreceptors (Ret+ or TrkB+), and proprioceptors (TrkC+). A direct comparison of early developmental timing between these subsets has not been performed. Here we characterized the accumulation and death of TrkA, B, C, and Ret+ neurons in the DRG as a function of developmental time. We find that TrkB, TrkC, and Ret-expressing neurons in the DRG complete developmental cell death prior to TrkA-expressing neurons. Given the broadly defined roles of the neurotrophin receptor p75NTR in augmenting neurotrophic signaling in sensory neurons, we investigated its role in supporting the survival of these distinct subpopulations. We find that TrkA+, TrkB+, and TrkC+ sensory neuron subpopulations require p75NTR for survival, but proliferating progenitors do not. These data demonstrate how diverging sensory neurons undergo successive waves of cell death and how p75NTR represses the magnitude, but not developmental window of this culling. © 2018 Wiley Periodicals, Inc. Develop Neurobiol 78: 701-717, 2018.
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Affiliation(s)
- Irene Cheng
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
- Neuroscience Graduate Program, University of Virginia, Charlottesville, VA 22903, USA
| | - Lucy Jin
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Lucy C. Rose
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Christopher D. Deppmann
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
- Department of Cell Biology, University of Virginia, Charlottesville, VA 22903, USA
- Department of Biomedical Engineering University of Virginia, Charlottesville, VA 22903, USA
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15
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Cheng I, Jin L, Rose LC, Deppmann CD. Cover Image. Dev Neurobiol 2018. [DOI: 10.1002/dneu.22609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Irene Cheng
- Department of Biology; University of Virginia; Charlottesville Virginia 22903
- Neuroscience Graduate Program, University of Virginia; Charlottesville Virginia 22903
| | - Lucy Jin
- Department of Biology; University of Virginia; Charlottesville Virginia 22903
| | - Lucy C. Rose
- Department of Biology; University of Virginia; Charlottesville Virginia 22903
| | - Christopher D. Deppmann
- Department of Biology; University of Virginia; Charlottesville Virginia 22903
- Department of Cell Biology; University of Virginia; Charlottesville Virginia 22903
- Department of Biomedical Engineering; University of Virginia; Charlottesville Virginia 22903
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16
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Barford K, Keeler A, McMahon L, McDaniel K, Yap CC, Deppmann CD, Winckler B. Transcytosis of TrkA leads to diversification of dendritic signaling endosomes. Sci Rep 2018; 8:4715. [PMID: 29549340 PMCID: PMC5856830 DOI: 10.1038/s41598-018-23036-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [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] [Received: 01/08/2018] [Accepted: 03/05/2018] [Indexed: 01/16/2023] Open
Abstract
The development of the peripheral nervous system relies on long-distance signaling from target organs back to the soma. In sympathetic neurons, this long-distance signaling is mediated by target derived Nerve Growth Factor (NGF) interacting with its axonal receptor, TrkA. This ligand receptor complex internalizes into what is commonly referred to as the signaling endosome which is transported retrogradely to the soma and dendrites to mediate survival signaling and synapse formation, respectively. The molecular identity of signaling endosomes in dendrites has not yet been determined. Here, we perform a detailed analysis of TrkA endosomal compartments and trafficking patterns. We find that signaling endosomes are not uniform but molecularly diversified into Rab7 (late endosome) and Rab11 (recycling endosome) populations in axons and dendrites in vitro and in the soma in vivo. Surprisingly, TrkA-NGF signaling endosomes in dendrites undergo dynamic trafficking events, including putative fusion and fission. Overall, we find that signaling endosomes do not remain as a singular endosomal subtype but instead exist in multiple populations that undergo dynamic endosomal trafficking events. These dynamic events might drive functional diversification of the signaling endosome.
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Affiliation(s)
- Kelly Barford
- Department of Cell Biology, University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, Virginia, 22908, USA
| | - Austin Keeler
- Department of Biology, University of Virginia, Physical Life Sciences Building (PLSB), 90 Geldard Drive, Charlottesville, Virginia, 22903, USA
| | - Lloyd McMahon
- Department of Cell Biology, University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, Virginia, 22908, USA
| | - Kathryn McDaniel
- Department of Cell Biology, University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, Virginia, 22908, USA
| | - Chan Choo Yap
- Department of Cell Biology, University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, Virginia, 22908, USA
| | - Christopher D Deppmann
- Department of Biology, University of Virginia, Physical Life Sciences Building (PLSB), 90 Geldard Drive, Charlottesville, Virginia, 22903, USA. .,Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia, 22903, USA.
| | - Bettina Winckler
- Department of Cell Biology, University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, Virginia, 22908, USA.
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17
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Abstract
Keeler and Deppmann preview work from Foldi et al. that describes some of the cellular mechanisms governing the induction of survival and death decisions by Drosophila neurotrophic factors. A competitive balance between constructive and destructive developmental cues governs both the form and function of the vertebrate nervous system. In this issue, Foldi et al. (2017. J. Cell Biol.https://doi.org/10.1083/jcb.201607098) explore the evolutionary origins of these cues and report that in Drosophila melanogaster pro- and mature neurotrophins are capable of inducing death and survival pathways, respectively, by binding Toll receptor family members, which then recruit distinct sets of effector proteins.
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Affiliation(s)
- Austin B Keeler
- Department of Biology, University of Virginia, Charlottesville, VA 22903
| | - Christopher D Deppmann
- Department of Biology, University of Virginia, Charlottesville, VA 22903 .,Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22903.,Department of Cell Biology, University of Virginia, Charlottesville, VA 22903.,Department of Neuroscience, University of Virginia, Charlottesville, VA 22903
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18
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Sipe LM, Yang C, Ephrem J, Garren E, Hirsh J, Deppmann CD. Differential sympathetic outflow to adipose depots is required for visceral fat loss in response to calorie restriction. Nutr Diabetes 2017; 7:e260. [PMID: 28394360 PMCID: PMC5436093 DOI: 10.1038/nutd.2017.13] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 02/01/2017] [Indexed: 01/10/2023] Open
Abstract
The sympathetic nervous system (SNS) regulates energy homeostasis in part by governing fatty acid liberation from adipose tissue. We first examined whether SNS activity toward discrete adipose depots changes in response to a weight loss diet in mice. We found that SNS activity toward each adipose depot is unique in timing, pattern of activation, and habituation with the most dramatic contrast between visceral and subcutaneous adipose depots. Sympathetic drive toward visceral epididymal adipose is more than doubled early in weight loss and then suppressed later in the diet when weight loss plateaued. Coincident with the decline in SNS activity toward visceral adipose is an increase in activity toward subcutaneous depots indicating a switch in lipolytic sources. In response to calorie restriction, SNS activity toward retroperitoneal and brown adipose depots is unaffected. Finally, pharmacological blockage of sympathetic activity on adipose tissue using the β3-adrenergic receptor antagonist, SR59230a, suppressed loss of visceral adipose mass in response to diet. These findings indicate that SNS activity toward discrete adipose depots is dynamic and potentially hierarchical. This pattern of sympathetic activation is required for energy liberation and loss of adipose tissue in response to calorie-restricted diet.
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Affiliation(s)
- L M Sipe
- Department of Biology, University of Virginia, Charlottesville, VA, USA
| | - C Yang
- Department of Biology, University of Virginia, Charlottesville, VA, USA
| | - J Ephrem
- Department of Biology, University of Virginia, Charlottesville, VA, USA
| | - E Garren
- Department of Biology, University of Virginia, Charlottesville, VA, USA
| | - J Hirsh
- Department of Biology, University of Virginia, Charlottesville, VA, USA
| | - C D Deppmann
- Department of Biology, University of Virginia, Charlottesville, VA, USA.,Department of Cell Biology, University of Virginia, Charlottesville, VA, USA.,Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA.,Department of Neuroscience, University of Virginia, Charlottesville, VA, USA
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19
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Smith CJ, Wheeler MA, Marjoram L, Bagnat M, Deppmann CD, Kucenas S. TNFa/TNFR2 signaling is required for glial ensheathment at the dorsal root entry zone. PLoS Genet 2017; 13:e1006712. [PMID: 28379965 PMCID: PMC5397050 DOI: 10.1371/journal.pgen.1006712] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 04/19/2017] [Accepted: 03/22/2017] [Indexed: 01/09/2023] Open
Abstract
Somatosensory information from the periphery is routed to the spinal cord through centrally-projecting sensory axons that cross into the central nervous system (CNS) via the dorsal root entry zone (DREZ). The glial cells that ensheath these axons ensure rapid propagation of this information. Despite the importance of this glial-axon arrangement, how this afferent nerve is assembled during development is unknown. Using in vivo, time-lapse imaging we show that as centrally-projecting pioneer axons from dorsal root ganglia (DRG) enter the spinal cord, they initiate expression of the cytokine TNFalpha. This induction coincides with ensheathment of these axons by associated glia via a TNF receptor 2 (TNFR2)-mediated process. This work identifies a signaling cascade that mediates peripheral glial-axon interactions and it functions to ensure that DRG afferent projections are ensheathed after pioneer axons complete their navigation, which promotes efficient somatosensory neural function.
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Affiliation(s)
- Cody J. Smith
- Department of Biology, University of Virginia, Charlottesville, Virginia, United States of America
| | - Michael A. Wheeler
- Neuroscience Graduate Program, University of Virginia, Charlottesville, Virginia, United States of America
| | - Lindsay Marjoram
- Department of Cell Biology, Duke University, Durham, North Carolina, United States of America
| | - Michel Bagnat
- Department of Cell Biology, Duke University, Durham, North Carolina, United States of America
| | - Christopher D. Deppmann
- Department of Biology, University of Virginia, Charlottesville, Virginia, United States of America
- Neuroscience Graduate Program, University of Virginia, Charlottesville, Virginia, United States of America
| | - Sarah Kucenas
- Department of Biology, University of Virginia, Charlottesville, Virginia, United States of America
- Neuroscience Graduate Program, University of Virginia, Charlottesville, Virginia, United States of America
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20
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Gamage KK, Cheng I, Park RE, Karim MS, Edamura K, Hughes C, Spano AJ, Erisir A, Deppmann CD. Death Receptor 6 Promotes Wallerian Degeneration in Peripheral Axons. Curr Biol 2017; 27:890-896. [PMID: 28285993 DOI: 10.1016/j.cub.2017.01.062] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [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: 10/14/2016] [Revised: 12/19/2016] [Accepted: 01/30/2017] [Indexed: 11/17/2022]
Abstract
Axon degeneration during development is required to sculpt a functional nervous system and is also a hallmark of pathological insult, such as injury [1, 2]. Despite similar morphological characteristics, very little overlap in molecular mechanisms has been reported between pathological and developmental degeneration [3-5]. In the peripheral nervous system (PNS), developmental axon pruning relies on receptor-mediated extrinsic degeneration mechanisms to determine which axons are maintained or degenerated [5-7]. Receptors have not been implicated in Wallerian axon degeneration; instead, axon autonomous, intrinsic mechanisms are thought to be the primary driver for this type of axon disintegration [8-10]. Here we survey the role of neuronally expressed, paralogous tumor necrosis factor receptor super family (TNFRSF) members in Wallerian degeneration. We find that an orphan receptor, death receptor 6 (DR6), is required to drive axon degeneration after axotomy in sympathetic and sensory neurons cultured in microfluidic devices. We sought to validate these in vitro findings in vivo using a transected sciatic nerve model. Consistent with the in vitro findings, DR6-/- animals displayed preserved axons up to 4 weeks after injury. In contrast to phenotypes observed in Wlds and Sarm1-/- mice, preserved axons in DR6-/- animals display profound myelin remodeling. This indicates that deterioration of axons and myelin after axotomy are mechanistically distinct processes. Finally, we find that JNK signaling after injury requires DR6, suggesting a link between this novel extrinsic pathway and the axon autonomous, intrinsic pathways that have become established for Wallerian degeneration.
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Affiliation(s)
- Kanchana K Gamage
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Irene Cheng
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA; Neuroscience Graduate Program, University of Virginia, Charlottesville, VA 22903, USA
| | - Rachel E Park
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Mardeen S Karim
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Kazusa Edamura
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Christopher Hughes
- Department of Physics and Astronomy, James Madison University, Harrisonburg, VA 22807, USA
| | - Anthony J Spano
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Alev Erisir
- Department of Psychology, University of Virginia, Charlottesville, VA 22903, USA
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21
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Abstract
The Coronin family of proteins were first noted for their role in pathogen-host interactions and for modulating actin dynamics. Recently, however, Coronins have been found in a greater variety of cell types, and novel roles for the Coronins within the nervous system have been discovered. In the immune system, Coronin-1a enables Mycobacterium tuberculosis to evade lysosomal destruction. This activity appears to be analogous to protection of the NGF-TrkA signaling endosome during sympathetic nervous system development that is required for survival signaling. Similarly, others have implicated Coronin-1a in GPCR signaling during the formation of excitatory connections in the central nervous system. Its role in multiple signaling pathways suggests that it may influence cross talk between key pathways (TrkA, GPCRs) during neurodevelopment. Here, we review the role of Coronin-1a in neural development and function.
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Affiliation(s)
- M Martorella
- University of Virginia, Charlottesville, VA, United States
| | - K Barford
- University of Virginia, Charlottesville, VA, United States
| | - B Winkler
- University of Virginia, Charlottesville, VA, United States
| | - C D Deppmann
- University of Virginia, Charlottesville, VA, United States.
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22
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Cheng I, Edamura K, Chan K, Jansch C, Heffner DL, Spano AJ, Deppmann CD. ISDN2014_0405: TNFR family members cooperate to mediate sympathetic nervous system development. Int J Dev Neurosci 2015. [DOI: 10.1016/j.ijdevneu.2015.04.324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Affiliation(s)
- Irene Cheng
- University of VirginiaCharlottesvilleVA22903USA
| | | | - Kelvin Chan
- University of VirginiaCharlottesvilleVA22903USA
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23
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Suo D, Park J, Deppmann CD. ISDN2014_0376: Coronin‐1 mediates hierarchal neurotrophin signaling required for sympathetic neuron target innervation. Int J Dev Neurosci 2015. [DOI: 10.1016/j.ijdevneu.2015.04.296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Affiliation(s)
- Dong Suo
- Department of BiologyUniversity of VirginiaCharlottesvilleVA22903USA
| | - Juyeon Park
- Department of BiologyUniversity of VirginiaCharlottesvilleVA22903USA
| | - Christopher D. Deppmann
- Department of BiologyUniversity of VirginiaCharlottesvilleVA22903USA
- Department of Cell BiologyUniversity of VirginiaCharlottesvilleVA22903USA
- Department of Biomedical EngineeringUniversity of VirginiaCharlottesvilleVA22903USA
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24
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Wheeler MA, Heffner DL, Kim S, Espy SM, Spano AJ, Cleland CL, Deppmann CD. TNF-α/TNFR1 signaling is required for the development and function of primary nociceptors. Neuron 2014; 82:587-602. [PMID: 24811380 DOI: 10.1016/j.neuron.2014.04.009] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/14/2014] [Indexed: 12/19/2022]
Abstract
Primary nociceptors relay painful touch information from the periphery to the spinal cord. Although it is established that signals generated by receptor tyrosine kinases TrkA and Ret coordinate the development of distinct nociceptive circuits, mechanisms modulating TrkA or Ret pathways in developing nociceptors are unknown. We have identified tumor necrosis factor (TNF) receptor 1 (TNFR1) as a critical modifier of TrkA and Ret signaling in peptidergic and nonpeptidergic nociceptors. Specifically, TrkA+ peptidergic nociceptors require TNF-α-TNFR1 forward signaling to suppress nerve growth factor (NGF)-mediated neurite growth, survival, excitability, and differentiation. Conversely, TNFR1-TNF-α reverse signaling augments the neurite growth and excitability of Ret+ nonpeptidergic nociceptors. The developmental and functional nociceptive defects associated with loss of TNFR1 signaling manifest behaviorally as lower pain thresholds caused by increased sensitivity to NGF. Thus, TNFR1 exerts a dual role in nociceptor information processing by suppressing TrkA and enhancing Ret signaling in peptidergic and nonpeptidergic nociceptors, respectively.
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Affiliation(s)
- Michael A Wheeler
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA; Neuroscience Graduate Program, University of Virginia, Charlottesville, VA 22903, USA
| | - Danielle L Heffner
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Suemin Kim
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Sarah M Espy
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Anthony J Spano
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA
| | - Corey L Cleland
- Department of Biology, James Madison University, Harrisonburg, VA 22807, USA
| | - Christopher D Deppmann
- Department of Biology, University of Virginia, Charlottesville, VA 22903, USA; Department of Cell Biology, University of Virginia, Charlottesville, VA 22903, USA; Department of Biomedical Engineering, University of Virginia, Charlottesville, VA 22903, USA.
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25
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Sokolowski JD, Gamage KK, Heffron DS, LeBlanc AC, Deppmann CD, Mandell JW. Caspase-mediated cleavage of actin and tubulin is a common feature and sensitive marker of axonal degeneration in neural development and injury. Acta Neuropathol Commun 2014; 2:16. [PMID: 24507707 PMCID: PMC3996144 DOI: 10.1186/2051-5960-2-16] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 02/05/2014] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Axon degeneration is a characteristic feature of multiple neuropathologic states and is also a mechanism of physiological neurodevelopmental pruning. The vast majority of in vivo studies looking at axon degeneration have relied on the use of classical silver degeneration stains, which have many limitations including lack of molecular specificity and incompatibility with immunolabeling methods. Because Wallerian degeneration is well known to involve cytoskeletal disassembly and because caspases are recently implicated in aspects of this process, we asked whether antibodies directed at caspase-generated neoepitopes of beta-actin and alpha-tubulin would be useful immunohistochemical markers of pathological and developmental axon degeneration. RESULTS Here we demonstrate that several forms of axon degeneration involve caspase-mediated cleavage of these cytoskeletal elements and are well-visualized using this approach. We demonstrate the generation of caspase-induced neoepitopes in a) an in vitro neuronal culture model using nerve growth factor-deprivation-induced degeneration and b) an in vivo model using ethanol-induced neuronal apoptosis, and c) during normal developmental pruning and physiological turnover of neurons. CONCLUSIONS Our findings support recent experimental data that suggests caspase-3 and caspase-6 have specific non-redundant roles in developmental pruning. Finally, these findings may have clinical utility, as these markers highlight degenerating neurites in human hypoxic-ischemic injury. Our work not only confirms a common downstream mechanism involved in axon degeneration, but also illuminates the potential utility of caspase-cleavage-neoepitope antibodies as markers of neurodegeneration.
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26
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Abstract
We report that developmental competition between sympathetic neurons for survival is critically dependent on a sensitization process initiated by target innervation and mediated by a series of feedback loops. Target-derived nerve growth factor (NGF) promoted expression of its own receptor TrkA in mouse and rat neurons and prolonged TrkA-mediated signals. NGF also controlled expression of brain-derived neurotrophic factor and neurotrophin-4, which, through the receptor p75, can kill neighboring neurons with low retrograde NGF-TrkA signaling whereas neurons with high NGF-TrkA signaling are protected. Perturbation of any of these feedback loops disrupts the dynamics of competition. We suggest that three target-initiated events are essential for rapid and robust competition between neurons: sensitization, paracrine apoptotic signaling, and protection from such effects.
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Affiliation(s)
- Christopher D. Deppmann
- The Solomon Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Stefan Mihalas
- The Solomon Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- The Zanvyl Krieger Mind/Brain Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Nikhil Sharma
- The Solomon Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Bonnie E. Lonze
- The Solomon Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Ernst Niebur
- The Solomon Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- The Zanvyl Krieger Mind/Brain Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - David D. Ginty
- The Solomon Snyder Department of Neuroscience, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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27
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Abstract
Glial-derived neurotrophic factor (GDNF), secreted by skeletal muscle, triggers expression of the ETS transcription factor Pea3 in a subset of motor neurons in the spinal cord. In this issue, find that this retrograde GDNF-Pea3 signal controls dendrite patterning and assembly of a sensory-motor reflex circuit.
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Affiliation(s)
- Christopher D Deppmann
- The Solomon H. Snyder Department of Neuroscience, Howard Hughes Medical Institute, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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Deppmann CD, Alvania RS, Taparowsky EJ. Cross-species annotation of basic leucine zipper factor interactions: Insight into the evolution of closed interaction networks. Mol Biol Evol 2006; 23:1480-92. [PMID: 16731568 DOI: 10.1093/molbev/msl022] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.3] [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] [Indexed: 12/13/2022] Open
Abstract
Dimeric basic leucine zipper (bZIP) factors constitute one of the most important classes of enhancer-type transcription factors. In vertebrates, bZIP factors are involved in many cellular processes, including cell survival, learning and memory, cancer progression, lipid metabolism, and a variety of developmental processes. These factors have the ability to homodimerize and heterodimerize in a specific and predictable manner, resulting in hundreds of dimers with unique effects on transcription. In recent years, several studies have described dimerization preferences for bZIP factors from different species, including Homo sapiens, Drosophila melanogaster, Arabidopsis thaliana, and Saccharomyces cerevisiae. Here, these findings are summarized as novel, graphical representations of closed, interacting protein networks. These representations combine phylogenetic information, DNA-binding properties, and dimerization preference. Beyond summarizing bZIP dimerization preferences within selected species, we have included annotation for a solitary bZIP factor found in the primitive eukaryote, Giardia lamblia, a possible evolutionary precursor to the complex networks of bZIP factors encoded by other genomes. Finally, we discuss the fundamental similarities and differences between dimerization networks within the context of bZIP factor evolution.
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29
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Deppmann CD, Acharya A, Rishi V, Wobbes B, Smeekens S, Taparowsky EJ, Vinson C. Dimerization specificity of all 67 B-ZIP motifs in Arabidopsis thaliana: a comparison to Homo sapiens B-ZIP motifs. Nucleic Acids Res 2004; 32:3435-45. [PMID: 15226410 PMCID: PMC443529 DOI: 10.1093/nar/gkh653] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.7] [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] [Indexed: 11/14/2022] Open
Abstract
Basic region-leucine zipper (B-ZIP) proteins are a class of dimeric sequence-specific DNA-binding proteins unique to eukaryotes. We have identified 67 B-ZIP proteins in the Arabidopsis thaliana genome. No A.thaliana B-ZIP domains are homologous with any Homo sapiens B-ZIP domains. Here, we predict the dimerization specificity properties of the 67 B-ZIP proteins in the A.thaliana genome based on three structural properties of the dimeric alpha-helical leucine zipper coiled coil structure: (i) length of the leucine zipper, (ii) placement of asparagine or a charged amino acid in the hydrophobic interface and (iii) presence of interhelical electrostatic interactions. Many A.thaliana B-ZIP leucine zippers are predicted to be eight or more heptads in length, in contrast to the four or five heptads typically found in H.sapiens, a prediction experimentally verified by circular dichroism analysis. Asparagine in the a position of the coiled coil is typically observed in the second heptad in H.sapiens. In A.thaliana, asparagine is abundant in the a position of both the second and fifth heptads. The particular placement of asparagine in the a position helps define 14 families of homodimerizing B-ZIP proteins in A.thaliana, in contrast to the six families found in H.sapiens. The repulsive interhelical electrostatic interactions that are used to specify heterodimerizing B-ZIP proteins in H.sapiens are not present in A.thaliana. Instead, we predict that plant leucine zippers rely on charged amino acids in the a position to drive heterodimerization. It appears that A.thaliana define many families of homodimerizing B-ZIP proteins by having long leucine zippers with asparagine judiciously placed in the a position of different heptads.
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30
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Deppmann CD, Thornton TM, Utama FE, Taparowsky EJ. Phosphorylation of BATF regulates DNA binding: a novel mechanism for AP-1 (activator protein-1) regulation. Biochem J 2003; 374:423-31. [PMID: 12809553 PMCID: PMC1223616 DOI: 10.1042/bj20030455] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [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: 03/25/2003] [Revised: 05/28/2003] [Accepted: 06/16/2003] [Indexed: 02/06/2023]
Abstract
BATF is a member of the AP-1 (activator protein-1) family of bZIP (basic leucine zipper) transcription factors that form transcriptionally inhibitory, DNA binding heterodimers with Jun proteins. In the present study, we demonstrate that BATF is phosphorylated in vivo on multiple serine and threonine residues and at least one tyrosine residue. Reverse-polarity PAGE revealed that serine-43 and threonine-48 within the DNA binding domain of BATF are phosphorylated. To model phosphorylation of the BATF DNA binding domain, serine-43 was replaced by an aspartate residue. BATF(S43D) retains the ability to dimerize with Jun proteins in vitro and in vivo, and the BATF(S43D):Jun heterodimer localizes properly to the nucleus of cells. Interestingly, BATF(S43D) functions like wild-type BATF to reduce AP-1-mediated gene transcription, despite the observed inability of the BATF(S43D):Jun heterodimer to bind DNA. These data demonstrate that phosphorylation of serine-43 converts BATF from a DNA binding into a non-DNA binding inhibitor of AP-1 activity. Given that 40% of mammalian bZIP transcription factors contain a residue analogous to serine-43 of BATF in their DNA binding domains, the phosphorylation event described here represents a mechanism that is potentially applicable to the regulation of many bZIP proteins.
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Affiliation(s)
- Christopher D Deppmann
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907-1392, USA
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31
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Abstract
The immortalization of human B lymphocytes by Epstein-Barr virus (EBV) requires the virus-encoded transactivator EBNA2 and the products of both viral and cellular genes which serve as EBNA2 targets. In this study, we identified BATF as a cellular gene that is up-regulated dramatically within 24 h following the infection of established and primary human B cells with EBV. The transactivation of BATF is mediated by EBNA2 in a B-cell-specific manner and is duplicated in non-EBV-infected B cells by the expression of mammalian Notch proteins. In contrast to other target genes activated by EBNA2, the BATF gene encodes a member of the AP-1 family of transcription factors that functions as a negative regulator of AP-1 activity and as an antagonist of cell growth. A potential role for BATF in promoting EBV latency is supported by studies in which BATF was shown to negatively impact the expression of a BZLF1 reporter gene and to reduce the frequency of lytic replication in latently infected cells. The identification of BATF as a cellular target of EBV provides important new information on how programs of viral and cellular gene expression may be coordinated to promote viral latency and control lytic-cycle entry.
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Affiliation(s)
- Lisa M Johansen
- Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907-1392, USA
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32
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Williams KL, Zullo AJ, Kaplan MH, Brutkiewicz RR, Deppmann CD, Vinson C, Taparowsky EJ. BATF transgenic mice reveal a role for activator protein-1 in NKT cell development. J Immunol 2003; 170:2417-26. [PMID: 12594265 DOI: 10.4049/jimmunol.170.5.2417] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The importance of regulated AP-1 activity during T cell development was assessed using transgenic mice overexpressing BATF, a basic leucine zipper transcription factor and an AP-1 inhibitor. BATF transgenic animals possess normal thymic cellularity and all major T cell subsets, but show impaired thymocyte proliferation in vitro and no induction of IL-2, IL-4, IL-5, IL-10, and IL-13 expression. Since NKT cells are largely responsible for cytokine production in the thymus, this population was examined by detection of the V alpha 14-J alpha 281 TCR, flow cytometry of NK1.1(+) TCR beta(+) cells, and analysis of cytokine production by heat-stable Ag(low) thymocytes and peripheral NKT cells stimulated in vivo. Results show a severe under-representation of NKT cells in BATF transgenic animals, providing the first evidence that the precise control of AP-1-mediated transcription is critical for the proper emergence of thymus-derived NKT cells in the mouse.
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MESH Headings
- Animals
- B-Lymphocyte Subsets/cytology
- Basic-Leucine Zipper Transcription Factors
- CD4-Positive T-Lymphocytes/immunology
- Cell Differentiation/genetics
- Cell Differentiation/immunology
- Cell Division/genetics
- Cell Division/immunology
- Cells, Cultured
- Cytokines/antagonists & inhibitors
- Cytokines/biosynthesis
- Cytokines/genetics
- Humans
- Immunophenotyping
- Killer Cells, Natural/cytology
- Killer Cells, Natural/immunology
- Killer Cells, Natural/metabolism
- Killer Cells, Natural/pathology
- Lymphocyte Activation/genetics
- Lymphopenia/genetics
- Lymphopenia/immunology
- Lymphopenia/pathology
- Mice
- Mice, Inbred C57BL
- Mice, Inbred Strains
- Mice, Knockout
- Mice, Transgenic/genetics
- Mice, Transgenic/immunology
- T-Lymphocyte Subsets/cytology
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
- T-Lymphocyte Subsets/pathology
- Thymus Gland/cytology
- Thymus Gland/immunology
- Thymus Gland/pathology
- Transcription Factor AP-1/antagonists & inhibitors
- Transcription Factor AP-1/physiology
- Transcription Factors/biosynthesis
- Transcription Factors/genetics
- Transcription Factors/physiology
- Transgenes/immunology
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Affiliation(s)
- Kristi L Williams
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA
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