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Jeon SM, Pradeep A, Chang D, McDonough L, Chen Y, Latremoliere A, Crawford LK, Caterina MJ. Skin Reinnervation by Collateral Sprouting Following Spared Nerve Injury in Mice. J Neurosci 2024; 44:e1494232024. [PMID: 38471780 PMCID: PMC11007315 DOI: 10.1523/jneurosci.1494-23.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 01/15/2024] [Accepted: 02/03/2024] [Indexed: 03/14/2024] Open
Abstract
Following peripheral nerve injury, denervated tissues can be reinnervated via regeneration of injured neurons or collateral sprouting of neighboring uninjured afferents into denervated territory. While there has been substantial focus on mechanisms underlying regeneration, collateral sprouting has received less attention. Here, we used immunohistochemistry and genetic neuronal labeling to define the subtype specificity of sprouting-mediated reinnervation of plantar hindpaw skin in the mouse spared nerve injury (SNI) model, in which productive regeneration cannot occur. Following initial loss of cutaneous afferents in the tibial nerve territory, we observed progressive centripetal reinnervation by multiple subtypes of neighboring uninjured fibers into denervated glabrous and hairy plantar skin of male mice. In addition to dermal reinnervation, CGRP-expressing peptidergic fibers slowly but continuously repopulated denervated epidermis, Interestingly, GFRα2-expressing nonpeptidergic fibers exhibited a transient burst of epidermal reinnervation, followed by a trend towards regression. Presumptive sympathetic nerve fibers also sprouted into denervated territory, as did a population of myelinated TrkC lineage fibers, though the latter did so inefficiently. Conversely, rapidly adapting Aβ fiber and C fiber low threshold mechanoreceptor (LTMR) subtypes failed to exhibit convincing sprouting up to 8 weeks after nerve injury in males or females. Optogenetics and behavioral assays in male mice further demonstrated the functionality of collaterally sprouted fibers in hairy plantar skin with restoration of punctate mechanosensation without hypersensitivity. Our findings advance understanding of differential collateral sprouting among sensory neuron subpopulations and may guide strategies to promote the progression of sensory recovery or limit maladaptive sensory phenomena after peripheral nerve injury.
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Affiliation(s)
- Sang-Min Jeon
- Department of Neurosurgery, Neurosurgery Pain Research Institute, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - Aishwarya Pradeep
- Department of Neurosurgery, Neurosurgery Pain Research Institute, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - Dennis Chang
- Department of Neurosurgery, Neurosurgery Pain Research Institute, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - Leah McDonough
- Department of Neurosurgery, Neurosurgery Pain Research Institute, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - Yijia Chen
- Department of Neurosurgery, Neurosurgery Pain Research Institute, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - Alban Latremoliere
- Department of Neurosurgery, Neurosurgery Pain Research Institute, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
- Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - LaTasha K Crawford
- Department of Pathological Sciences, University of Wisconsin-Madison School of Veterinary Medicine, Madison, Wisconsin 53706
| | - Michael J Caterina
- Department of Neurosurgery, Neurosurgery Pain Research Institute, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
- Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
- Department of Biological Chemistry, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
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2
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Wang Y, Ye L. The Afferent Function of Adipose Innervation. Diabetes 2024; 73:348-354. [PMID: 38377447 PMCID: PMC10882147 DOI: 10.2337/dbi23-0002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 12/18/2023] [Indexed: 02/22/2024]
Abstract
Adipose tissue innervation is critical for regulating metabolic and energy homeostasis. While the sympathetic efferent innervation of fat is well characterized, the role of sensory or afferent innervation remains less explored. This article reviews previous work on adipose innervation and recent advances in the study of sensory innervation of adipose tissues. We discuss key open questions, including the physiological implications of adipose afferents in homeostasis as well as potential cross talk with sympathetic neurons, the immune system, and hormonal pathways. We also outline the general technical challenges of studying dorsal root ganglia innervating fat, along with emerging technologies that may overcome these barriers. Finally, we highlight areas for further research to deepen our understanding of the afferent function of adipose innervation.
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Affiliation(s)
- Yu Wang
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA
| | - Li Ye
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA
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Viudes-Sarrión N, Aleixandre-Carrera F, Beltrá P, Ortega FJ, Molina-Payá FJ, Velasco E, Delicado-Miralles M. Blood flow effects of percutaneous peripheral nerve stimulation. A blinded, randomized clinical trial. Eur J Clin Invest 2024; 54:e14091. [PMID: 37675595 DOI: 10.1111/eci.14091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 07/18/2023] [Accepted: 08/23/2023] [Indexed: 09/08/2023]
Abstract
BACKGROUND The vasculature function is mainly regulated by the autonomic nervous system. Importantly, the sensory-motor nervous system also innervates peripheral vessels and has the capacity to modulate vascular tone. Here we investigated the effects of electrical stimulation of a mixed nerve trunk on blood flow in deep arteries and muscle perfusion. Our hypothesis is that stimulation of a mixed nerve can modify blood flow. METHODS Twenty-nine healthy participants were included into a randomized-crossover and blinded clinical trial. Each subject received a placebo and two percutaneous peripheral nerve stimulation (pPNS) protocols on the median nerve: Pain Threshold continuous Low Frequency (PT-cLF) and Sensory Threshold burst High Frequency (ST-bHF). Blood flow was then assessed bilaterally using Power Doppler Ultrasonography at the main arteries of the arm, and blood perfusion at the forearm muscles. Afterwards, blood flow was quantified using a semi-automatized software, freely shared here. RESULTS Placebo, consisting in needle insertion, produced an immediate and generalized reduction on peak systolic velocity in all arteries. Although nerve stimulation produced mainly no effects, some significant differences were found: both protocols increased the relative perfusion area of the forearm muscles, the ST-bHF protocol prevented the reduction in peak systolic velocity and TAMEAN of the radial artery produced by the control protocol and PT-cLF produced a TAMEAN reduction of the ulnar artery. CONCLUSIONS Therefore, the arterial blood flow in the arm is mainly impervious to the electrical stimulation of the median nerve, composed by autonomic and sensory-motor axons, although it produces mild modifications in the forearm muscles perfusion.
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Affiliation(s)
- Nuria Viudes-Sarrión
- Skeletal Biology and Engineering Research Center, KU Leuven, Leuven, Belgium
- Human Movement Biomechanics Research Group, Deptartment of Movement Sciences, KU Leuven, Leuven, Belgium
- Neuroscience in Physiotherapy (NiP), Independent Research Group, Elche, Spain
| | - Fernando Aleixandre-Carrera
- Neuroscience in Physiotherapy (NiP), Independent Research Group, Elche, Spain
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC, San Juan de Alicante, Spain
| | - Patricia Beltrá
- Neuroscience in Physiotherapy (NiP), Independent Research Group, Elche, Spain
- Physical Therapy Department, Valencia University, Valencia, Spain
| | - Francisco Javier Ortega
- Physical therapy and advanced rehabilitation clinic RehAv Elche, Elche, Spain
- Physical Therapy Department, Health Sciences Faculty, CEU-Cardenal Herrera University, CEU Universities, Elche, Spain
| | - Francisco Javier Molina-Payá
- Physical Therapy Department, Health Sciences Faculty, CEU-Cardenal Herrera University, CEU Universities, Elche, Spain
| | - Enrique Velasco
- Neuroscience in Physiotherapy (NiP), Independent Research Group, Elche, Spain
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB-KU Leuven Center for Brain & Disease Research, Leuven, Belgium
| | - Miguel Delicado-Miralles
- Neuroscience in Physiotherapy (NiP), Independent Research Group, Elche, Spain
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC, San Juan de Alicante, Spain
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Yu H, Usoskin D, Nagi SS, Hu Y, Kupari J, Bouchatta O, Cranfill SL, Gautam M, Su Y, Lu Y, Wymer J, Glanz M, Albrecht P, Song H, Ming GL, Prouty S, Seykora J, Wu H, Ma M, Rice FL, Olausson H, Ernfors P, Luo W. Single-Soma Deep RNA sequencing of Human DRG Neurons Reveals Novel Molecular and Cellular Mechanisms Underlying Somatosensation. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.17.533207. [PMID: 36993480 PMCID: PMC10055202 DOI: 10.1101/2023.03.17.533207] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
The versatility of somatosensation arises from heterogeneous dorsal root ganglion (DRG) neurons. However, soma transcriptomes of individual human DRG (hDRG) neurons-critical in-formation to decipher their functions-are lacking due to technical difficulties. Here, we developed a novel approach to isolate individual hDRG neuron somas for deep RNA sequencing (RNA-seq). On average, >9,000 unique genes per neuron were detected, and 16 neuronal types were identified. Cross-species analyses revealed remarkable divergence among pain-sensing neurons and the existence of human-specific nociceptor types. Our deep RNA-seq dataset was especially powerful for providing insight into the molecular mechanisms underlying human somatosensation and identifying high potential novel drug targets. Our dataset also guided the selection of molecular markers to visualize different types of human afferents and the discovery of novel functional properties using single-cell in vivo electrophysiological recordings. In summary, by employing a novel soma sequencing method, we generated an unprecedented hDRG neuron atlas, providing new insights into human somatosensation, establishing a critical foundation for translational work, and clarifying human species-species properties.
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Jeon SM, Pradeep A, Chang D, McDonough L, Chen Y, Latremoliere A, Crawford LK, Caterina MJ. SKIN REINNERVATION BY COLLATERAL SPROUTING FOLLOWING SPARED NERVE INJURY IN MICE. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.12.557420. [PMID: 37745384 PMCID: PMC10515828 DOI: 10.1101/2023.09.12.557420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Following peripheral nerve injury, denervated tissues can be reinnervated via regeneration of injured neurons or via collateral sprouting of neighboring uninjured afferents into the denervated territory. While there has been substantial focus on mechanisms underlying regeneration, collateral sprouting has received relatively less attention. In this study, we used immunohistochemistry and genetic neuronal labeling to define the subtype specificity of sprouting-mediated reinnervation of plantar hind paw skin in the mouse spared nerve injury (SNI) model, in which productive regeneration cannot occur. Following an initial loss of cutaneous afferents in the tibial nerve territory, we observed progressive centripetal reinnervation by multiple subtypes of neighboring uninjured fibers into denervated glabrous and hairy plantar skin. In addition to dermal reinnervation, CGRP-expressing peptidergic fibers slowly but continuously repopulated the denervated epidermis, Interestingly, GFRα2-expressing nonpeptidergic fibers exhibited a transient burst of epidermal reinnervation, followed by trend towards regression. Presumptive sympathetic nerve fibers also sprouted into the denervated territory, as did a population of myelinated TrkC lineage fibers, though the latter did so less efficiently. Conversely, rapidly adapting Aβ fiber and C fiber low threshold mechanoreceptor (LTMR) subtypes failed to exhibit convincing collateral sprouting up to 8 weeks after nerve injury. Optogenetics and behavioral assays further demonstrated the functionality of collaterally sprouted fibers in hairy plantar skin with restoration of punctate mechanosensation without hypersensitivity. Our findings advance understanding of differential collateral sprouting among sensory neuron subpopulations and may guide strategies to promote the progression of sensory recovery or limit maladaptive sensory phenomena after peripheral nerve injury. Significance Statement Following nerve injury, whereas one mechanism for tissue reinnervation is regeneration of injured neurons, another, less well studied mechanism is collateral sprouting of nearby uninjured neurons. In this study, we examined collateral sprouting in denervated mouse skin and showed that it involves some, but not all neuronal subtypes. Despite such heterogeneity, a significant degree of restoration of punctate mechanical sensitivity is achieved. These findings highlight the diversity of collateral sprouting among peripheral neuron subtypes and reveal important differences between pre- and post-denervation skin that might be appealing targets for therapeutic correction to enhance functional recovery from denervation and prevent unwanted sensory phenomena such as pain or numbness.
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6
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Wang Y, Ye L. Somatosensory innervation of adipose tissues. Physiol Behav 2023; 265:114174. [PMID: 36965573 DOI: 10.1016/j.physbeh.2023.114174] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 03/21/2023] [Accepted: 03/22/2023] [Indexed: 03/27/2023]
Abstract
The increasing prevalence of obesity and type 2 diabetes has led to a greater interest in adipose tissue physiology. Adipose tissue is now understood as an organ with endocrine and thermogenic capacities in addition to its role in fat storage. It plays a critical role in systemic metabolism and energy regulation, and its activity is tightly regulated by the nervous system. Fat is now recognized to receive sympathetic innervation, which transmits information from the brain, as well as sensory innervation, which sends information into the brain. The role of sympathetic innervation in adipose tissue has been extensively studied. However, the extent and the functional significance of sensory innervation have long been unclear. Recent studies have started to reveal that sensory neurons robustly innervate adipose tissue and play an important role in regulating fat activity. This brief review will discuss both historical evidence and recent advances, as well as important remaining questions about the sensory innervation of adipose tissue.
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Affiliation(s)
- Yu Wang
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Li Ye
- Department of Neuroscience and Dorris Neuroscience Center, The Scripps Research Institute, La Jolla, CA 92037, USA; Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA.
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Kumar V, Kingsley D, Perikamana SM, Mogha P, Goodwin CR, Varghese S. Self-assembled innervated vasculature-on-a-chip to study nociception. Biofabrication 2023; 15:10.1088/1758-5090/acc904. [PMID: 36996841 PMCID: PMC10152403 DOI: 10.1088/1758-5090/acc904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 03/30/2023] [Indexed: 04/01/2023]
Abstract
Nociceptor sensory neurons play a key role in eliciting pain. An active crosstalk between nociceptor neurons and the vascular system at the molecular and cellular level is required to sense and respond to noxious stimuli. Besides nociception, interaction between nociceptor neurons and vasculature also contributes to neurogenesis and angiogenesis.In vitromodels of innervated vasculature can greatly help delineate these roles while facilitating disease modeling and drug screening. Herein, we report the development of a microfluidic-assisted tissue model of nociception in the presence of microvasculature. The self-assembled innervated microvasculature was engineered using endothelial cells and primary dorsal root ganglion (DRG) neurons. The sensory neurons and the endothelial cells displayed distinct morphologies in presence of each other. The neurons exhibited an elevated response to capsaicin in the presence of vasculature. Concomitantly, increased transient receptor potential cation channel subfamily V member 1 (TRPV1) receptor expression was observed in the DRG neurons in presence of vascularization. Finally, we demonstrated the applicability of this platform for modeling nociception associated with tissue acidosis. While not demonstrated here, this platform could also serve as a tool to study pain resulting from vascular disorders while also paving the way towards the development of innervated microphysiological models.
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Affiliation(s)
- Vardhman Kumar
- Department of Biomedical Engineering, Duke University, Durham NC
| | - David Kingsley
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham NC
| | | | - Pankaj Mogha
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham NC
| | - C Rory Goodwin
- Department of Neurosurgery, Spine Division, Duke University Medical Center, Durham, NC
| | - Shyni Varghese
- Department of Biomedical Engineering, Duke University, Durham NC
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham NC
- Department of Mechanical Engineering and Material Science, Duke University, Durham NC
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Kim DD, DeSnyder SM, Dougherty PM, Cata JP. Effect of neoadjuvant chemotherapy on intraoperative core temperature in patients with breast cancer: a retrospective cohort study. BJA OPEN 2023; 5:100119. [PMID: 37587989 PMCID: PMC10430839 DOI: 10.1016/j.bjao.2022.100119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 12/06/2022] [Accepted: 12/12/2022] [Indexed: 08/18/2023]
Abstract
Background Clinical evidence suggests that chemotherapeutic agents are associated with neuropathy and peripheral autonomic dysfunction. However, the possible effects of neoadjuvant chemotherapy on intraoperative temperature remain poorly characterised. Methods We evaluated patients who underwent a mastectomy for breast cancer between April 2016 and July 2020. Propensity scores were used to match patients who received neoadjuvant chemotherapy with those who did not, and intraoperative core temperature patterns were analysed in the matched cohort. The independent associations between vasopressor use and heart rate during general anaesthesia in the matched cohort were also analysed. Results Data from 1764 patients were analysed (882 patients in each group). Both groups presented a similar pattern of heat redistribution and subsequent rewarming; however, the neoadjuvant chemotherapy group did not reach the same intraoperative plateau temperature as the group that did not receive prior chemotherapy, with differences of up to 0.4°C (95% confidence interval: 0.11-0.63°C; P=0.005). In a subgroup analysis, neuropathy in patients who received neoadjuvant chemotherapy was associated with increased use of vasopressors and higher heart rate. Conclusions In patients with breast cancer, neoadjuvant chemotherapy is associated with lower plateau core temperatures, increased vasopressor use, and higher heart rates during general anaesthesia, which is more severe in the presence of neuropathy.
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Affiliation(s)
- Daniel D. Kim
- Department of Anesthesiology and Perioperative Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Anesthesiology and Surgical Oncology Research Group, Houston, TX, USA
| | - Sarah M. DeSnyder
- Department of Breast Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Patrick M. Dougherty
- Department of Pain Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Juan P. Cata
- Department of Anesthesiology and Perioperative Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Anesthesiology and Surgical Oncology Research Group, Houston, TX, USA
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Niu Y, Du SZ, He R. TNF-α interference ameliorates brain damage in neonatal hypoxic-ischemic encephalopathy rats by regulating the expression of NT-3 and TRKC. IBRAIN 2023; 9:381-389. [PMID: 38680513 PMCID: PMC11045181 DOI: 10.1002/ibra.12089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 01/06/2023] [Accepted: 01/13/2023] [Indexed: 05/01/2024]
Abstract
The aim of this study is to explore the effect of tumor necrosis factor-α (TNF-α) inhibition in rats with neonatal hypoxic-ischemic encephalopathy (HIE) and ascertain the relevant signaling pathways. The Zea-Longa score was used to evaluate the neurological function of the rats. ImageJ was used for quantification of the brain edema volume. Triphenyl tetrazolium chloride (TTC) staining of brain tissue was performed 24 h after hypoxic-ischemic (HI) to detect right brain infarction. The expression of TNF-α was detected by real-time quantitative polymerase chain reaction (RT-qPCR). Immunofluorescence staining was used to identify the localization of TNF-α; Then, the effective shRNA fragment of TNF-α was used to validate the role of TNF-α in HIE rats, and the change of neurotrofin-3 (NT-3) and tyrosine kinase receptor-C (TRKC) was examined after TNF-α-shRNA lentivirus transfection to determine downstream signaling associated with TNF-α. Protein interaction analysis was carried out to predict the links among TNF-α, NT-3, and TRKC. Cerebral edema volume and infarction increased in the right brain after the HI operation. The Zea-Longa score significantly increased within 24 h after the HI operation. The relative expression of TNF-α was upregulated after the HI operation. TNF-α was highly expressed in the right hippocampus post HI through immunofluorescence staining. Bioinformatics analysis found a direct or an indirect link among TNF-α, NT-3, and TRKC. Moreover, the interference of TNF-α increased the expression of NT-3 and TRKC. TNF-α interference might alleviate brain injury in HIE by upregulating NT-3 and TRKC.
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Affiliation(s)
- Yong‐Min Niu
- Institute of NeuroscienceKunming Medical UniversityKunmingChina
| | - Steven Z. Du
- Department of Integrative BiologyUniversity of Wisconsin‐MadisonMadisonWisconsinUSA
| | - Rong He
- Animal Zoology DepartmentKunming Medical UniversityKunmingChina
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Lv C, Sun M, Guo Y, Xia W, Qiao S, Tao Y, Fang Y, Zhang Q, Zhu Y, Yalikun Y, Xia Y, Wei Z, Dai Y. Cholinergic dysfunction-induced insufficient activation of alpha7 nicotinic acetylcholine receptor drives the development of rheumatoid arthritis through promoting protein citrullination via the SP3/PAD4 pathway. Acta Pharm Sin B 2023; 13:1600-1615. [PMID: 37139415 PMCID: PMC10150100 DOI: 10.1016/j.apsb.2023.01.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 10/10/2022] [Accepted: 11/23/2022] [Indexed: 01/19/2023] Open
Abstract
Both cholinergic dysfunction and protein citrullination are the hallmarks of rheumatoid arthritis (RA), but the relationship between the two phenomena remains unclear. We explored whether and how cholinergic dysfunction accelerates protein citrullination and consequently drives the development of RA. Cholinergic function and protein citrullination levels in patients with RA and collagen-induced arthritis (CIA) mice were collected. In both neuron-macrophage coculture system and CIA mice, the effect of cholinergic dysfunction on protein citrullination and expression of peptidylarginine deiminases (PADs) was assessed by immunofluorescence. The key transcription factors for PAD4 expression were predicted and validated. Cholinergic dysfunction in the patients with RA and CIA mice negatively correlated with the degree of protein citrullination in synovial tissues. The cholinergic or alpha7 nicotinic acetylcholine receptor (α7nAChR) deactivation and activation resulted in the promotion and reduction of protein citrullination in vitro and in vivo, respectively. Especially, the activation deficiency of α7nAChR induced the earlier onset and aggravation of CIA. Furthermore, deactivation of α7nAChR increased the expression of PAD4 and specificity protein-3 (SP3) in vitro and in vivo. Our results suggest that cholinergic dysfunction-induced deficient α7nAChR activation, which induces the expression of SP3 and its downstream molecule PAD4, accelerating protein citrullination and the development of RA.
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Affiliation(s)
- Changjun Lv
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Minghui Sun
- Division of Sports Medicine and Adult Reconstructive Surgery, Department of Orthopedic Surgery, Nanjing Drum Tower Hospital, the Affiliated Hospital of Nanjing University Medical School, Nanjing 210008, China
| | - Yilei Guo
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Wenxin Xia
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Simiao Qiao
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Yu Tao
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Yulai Fang
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Qin Zhang
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Yanrong Zhu
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Yusufu Yalikun
- Division of Sports Medicine and Adult Reconstructive Surgery, Department of Orthopedic Surgery, Nanjing Drum Tower Hospital, the Affiliated Hospital of Nanjing University Medical School, Nanjing 210008, China
| | - Yufeng Xia
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
| | - Zhifeng Wei
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
- Corresponding authors.
| | - Yue Dai
- Department of Pharmacology of Chinese Materia Medica, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China
- Corresponding authors.
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Oral Sensory Neurons of the Geniculate Ganglion That Express Tyrosine Hydroxylase Comprise a Subpopulation That Contacts Type II and Type III Taste Bud Cells. eNeuro 2022; 9:ENEURO.0523-21.2022. [PMID: 36216506 PMCID: PMC9581578 DOI: 10.1523/eneuro.0523-21.2022] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 07/30/2022] [Accepted: 08/22/2022] [Indexed: 01/26/2023] Open
Abstract
Oral sensory neurons of the geniculate ganglion (GG) innervate taste papillae and buds on the tongue and soft palate. Electrophysiological recordings of these neurons and fibers revealed complexity in the number of unique response profiles observed, suggesting there are several distinct neuronal subtypes. Molecular descriptions of these subpopulations are incomplete. We report here the identification of a subpopulation of GG oral sensory neurons in mice by expression of tyrosine hydroxylase (TH). TH-expressing geniculate neurons represent 10-20% of oral sensory neurons and these neurons innervate taste buds in fungiform and anterior foliate taste papillae on the surface of the tongue, as well as taste buds in the soft palate. While 35-50% of taste buds on the tongue are innervated by these TH+ neurons, 100% of soft palate taste buds are innervated. These neurons did not have extragemmal processes outside of taste buds and did not express the mechanosensory neuron-associated gene Ret, suggesting they are chemosensory and not somatosensory neurons. Within taste buds, TH-expressing fibers contacted both Type II and Type III cells, raising the possibility that they are responsive to more than one taste quality. During this analysis we also identified a rare TH+ taste receptor cell type that was found in only 12-25% of taste buds and co-expressed TRPM5, suggesting it was a Type II cell. Taken together, TH-expressing GG oral sensory neurons innervate taste buds preferentially in the soft palate and contact Type II and Type III taste bud receptor cells.
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Abstract
Internal organs, including the airway, are innervated by neurons of the autonomic and sensory nervous systems. The airway-innervating sensory neurons primarily originate from the vagus nerve, whose cell bodies are found, in rodents, in the jugular and nodose ganglia complex (JNC). About half of these sensory neurons expressed the heat-sensing ion channel TRPV1 and evolved to limit tissue damage by detecting chemical, mechanical, or thermal threats and to initiate protective airway reflexes such as coughing and bronchoconstriction. They also help monitor the host homeostasis by sensing nutrients, pressure, and O2 levels and help mount airway defenses by controlling immune and goblet cell activity. To better appreciate the scope of the physiological role and pathological contributions of these neurons, we will review gain and loss-of-function approaches geared at controlling the activity of these neurons. We will also present a method to study transcriptomic changes in airway-innervating neurons and a co-culture approach designed to understand how nociceptors modulate immune responses.
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Affiliation(s)
- Jo-Chiao Wang
- Department of Pharmacology and Physiology, Université de Montréal, Montréal, QC, Canada
| | - Theo Crosson
- Department of Pharmacology and Physiology, Université de Montréal, Montréal, QC, Canada
| | - Sebastien Talbot
- Department of Pharmacology and Physiology, Université de Montréal, Montréal, QC, Canada.
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Wang Y, Leung VH, Zhang Y, Nudell VS, Loud M, Servin-Vences MR, Yang D, Wang K, Moya-Garzon MD, Li VL, Long JZ, Patapoutian A, Ye L. The role of somatosensory innervation of adipose tissues. Nature 2022; 609:569-574. [PMID: 36045288 PMCID: PMC9477745 DOI: 10.1038/s41586-022-05137-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 07/22/2022] [Indexed: 12/28/2022]
Abstract
Adipose tissues communicate with the central nervous system to maintain whole-body energy homeostasis. The mainstream view is that circulating hormones secreted by the fat convey the metabolic state to the brain, which integrates peripheral information and regulates adipocyte function through noradrenergic sympathetic output1. Moreover, somatosensory neurons of the dorsal root ganglia innervate adipose tissue2. However, the lack of genetic tools to selectively target these neurons has limited understanding of their physiological importance. Here we developed viral, genetic and imaging strategies to manipulate sensory nerves in an organ-specific manner in mice. This enabled us to visualize the entire axonal projection of dorsal root ganglia from the soma to subcutaneous adipocytes, establishing the anatomical underpinnings of adipose sensory innervation. Functionally, selective sensory ablation in adipose tissue enhanced the lipogenic and thermogenetic transcriptional programs, resulting in an enlarged fat pad, enrichment of beige adipocytes and elevated body temperature under thermoneutral conditions. The sensory-ablation-induced phenotypes required intact sympathetic function. We postulate that beige-fat-innervating sensory neurons modulate adipocyte function by acting as a brake on the sympathetic system. These results reveal an important role of the innervation by dorsal root ganglia of adipose tissues, and could enable future studies to examine the role of sensory innervation of disparate interoceptive systems.
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Affiliation(s)
- Yu Wang
- grid.214007.00000000122199231Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA USA ,grid.413575.10000 0001 2167 1581Howard Hughes Medical Institute, Chevy Chase, MD USA
| | - Verina H. Leung
- grid.214007.00000000122199231Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA USA
| | - Yunxiao Zhang
- grid.214007.00000000122199231Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA USA ,grid.413575.10000 0001 2167 1581Howard Hughes Medical Institute, Chevy Chase, MD USA
| | - Victoria S. Nudell
- grid.214007.00000000122199231Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA USA
| | - Meaghan Loud
- grid.214007.00000000122199231Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA USA ,grid.413575.10000 0001 2167 1581Howard Hughes Medical Institute, Chevy Chase, MD USA
| | - M. Rocio Servin-Vences
- grid.214007.00000000122199231Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA USA ,grid.413575.10000 0001 2167 1581Howard Hughes Medical Institute, Chevy Chase, MD USA
| | - Dong Yang
- grid.214007.00000000122199231Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA USA
| | - Kristina Wang
- grid.214007.00000000122199231Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA USA
| | - Maria Dolores Moya-Garzon
- grid.168010.e0000000419368956Department of Pathology, Stanford School of Medicine, Sarafan ChEM-H, Stanford University, Stanford, CA USA
| | - Veronica L. Li
- grid.168010.e0000000419368956Department of Pathology, Stanford School of Medicine, Sarafan ChEM-H, Stanford University, Stanford, CA USA
| | - Jonathan Z. Long
- grid.168010.e0000000419368956Department of Pathology, Stanford School of Medicine, Sarafan ChEM-H, Stanford University, Stanford, CA USA
| | - Ardem Patapoutian
- Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA, USA. .,Howard Hughes Medical Institute, Chevy Chase, MD, USA.
| | - Li Ye
- Department of Neuroscience, Dorris Neuroscience Center, Scripps Research, San Diego, CA, USA.
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McMullan S, Burke PG, Hildreth CM. Do catecholaminergic TrkC DRG neurons represent a class of cardiovascular enteroceptor? Cell Rep 2022; 38:110082. [DOI: 10.1016/j.celrep.2021.110082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/22/2021] [Accepted: 11/10/2021] [Indexed: 02/07/2023] Open
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15
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TrkC-CreERT2-mediated recombination supports evidence that TrkC+/TH+ DRG neurons contribute to cardiovascular homeostasis. Cell Rep 2022; 38:110260. [DOI: 10.1016/j.celrep.2021.110260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/08/2021] [Accepted: 12/21/2021] [Indexed: 11/20/2022] Open
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16
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Martínez-Lavín M. Is fibromyalgia an autoimmune illness? Clin Rheumatol 2021; 40:3865-3866. [PMID: 34401963 DOI: 10.1007/s10067-021-05888-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 08/08/2021] [Accepted: 08/10/2021] [Indexed: 12/26/2022]
Affiliation(s)
- Manuel Martínez-Lavín
- Chief Rheumatology Department , National Institute of Cardiology , Mexico City, Mexico.
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