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Jiang L, Yang J, Gao X, Huang J, Liu Q, Fu L. In vivo imaging of vagal-induced myenteric plexus responses in gastrointestinal tract with an optical window. Nat Commun 2024; 15:8123. [PMID: 39285207 PMCID: PMC11405534 DOI: 10.1038/s41467-024-52397-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Accepted: 09/03/2024] [Indexed: 09/20/2024] Open
Abstract
The vagus nerve (VN) extensively innervates the gastric enteric nervous system (ENS), but its influence on gastric ENS functionality and motility in vivo remains unclear due to technical challenges. Here we describe a method for stable, long-term observation of gastric ENS activity and muscle dynamics at cellular resolution, which can also be extended to intestinal applications. This method involves ENS-specific labeling and the implantation of an abdominal wall window for optical recording in male mice. In vivo calcium imaging reveals a linear relationship between vagal stimulation frequency and myenteric neuron activation in gastric antrum. Furthermore, the motility of gastric antrum is significantly enhanced and shows a positive correlation with the intensity and number of activated myenteric neurons. While vagal stimulation also activates proximal colonic myenteric neurons, this activation is not frequency-dependent and does not induce proximal colonic motility. The method and results provide important insights into VN-ENS interactions in vivo, advancing our understanding of gastrointestinal motility regulation.
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Affiliation(s)
- Longjie Jiang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, China
- MoE Key Laboratory for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Jie Yang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, China
- MoE Key Laboratory for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xiujuan Gao
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, China
- MoE Key Laboratory for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Jiangfeng Huang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, China
- MoE Key Laboratory for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Qian Liu
- School of Biomedical Engineering, Hainan University, Haikou, Hainan, China
| | - Ling Fu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, China.
- MoE Key Laboratory for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan, Hubei, China.
- School of Biomedical Engineering, Hainan University, Haikou, Hainan, China.
- School of Physics and Optoelectronics Engineering, Hainan University, Haikou, Hainan, China.
- Advanced Biomedical Imaging Facility, Huazhong University of Science and Technology, Wuhan, Hubei, China.
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Yan Q, Chen J, Ren X, Song Y, Xu J, Xuan S, Jiang X, Kuang Z, Tang Z. Vagus Nerve Stimulation Relives Irritable Bowel Syndrome and the Associated Depression via α7nAChR-mediated Anti-inflammatory Pathway. Neuroscience 2023; 530:26-37. [PMID: 37625687 DOI: 10.1016/j.neuroscience.2023.08.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 08/10/2023] [Accepted: 08/18/2023] [Indexed: 08/27/2023]
Abstract
OBJECTIVES The present study is designed to investigate the role of vagus nerve in the treatments of irritable bowel syndrome (IBS) and the associated central nervous system disorders. METHODS An IBS animal model was established by giving acetic acid and chronic-acute stress (AA-CAS) treatment in adult male Wistar rats. Subdiaphragmatic vagotomy (SDV) and vagus nerve stimulation (VNS) were performed to intervene the excitability of vagus nerve. Permeability of blood brain barrier (BBB) was measured and agonist and antagonist of α7 nicotinic acetylcholine receptor (α7nAChR) were used to explore the relevant mechanisms. RESULTS AA-CAS treatment resulted in abnormal fecal output, increased visceral sensitivity, depressive-like behaviors, and overexpression of inflammatory mediators, all of which were reversed by VNS treatment. The effects of VNS could also be observed when α7nAChR agonist was applied. Whereas α7nAChR antagonist (methyllycaconitine, MLA) reversed VNS's effects. Interestingly, VNS also reduced the increased permeability of blood brain barrier (BBB) following AA-CAS treatment in IBS rats. SDV treatment only show temporary efficacy on AA-CAS-induced symptoms and had no effect on the permeability of BBB. CONCLUSION The intestinal abnormalities and depressive symptoms in IBS rats can be improved by VNS treatment. This positive effect of VNS was achieved through α7nAChR-mediated inflammatory pathway and may also be associated with the decreased of BBB permeability.
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Affiliation(s)
- Qizhi Yan
- Shaoxing People's Hospital, Shaoxing 312000, China
| | - Jiawei Chen
- Shaoxing People's Hospital, Shaoxing 312000, China
| | - Xiuying Ren
- Shaoxing People's Hospital, Shaoxing 312000, China
| | - Yibo Song
- Shaoxing People's Hospital, Shaoxing 312000, China
| | - Jian Xu
- Shaoxing People's Hospital, Shaoxing 312000, China
| | - Shaoyan Xuan
- Shaoxing People's Hospital, Shaoxing 312000, China
| | - Xi Jiang
- Zhejiang University Mingzhou Hospital, Ningbo 315000, China
| | - Zhijian Kuang
- Zhejiang University Mingzhou Hospital, Ningbo 315000, China
| | - Zhihua Tang
- Shaoxing People's Hospital, Shaoxing 312000, China.
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Majerus SJA, Cabal D, Hacohen Y, Hanzlicek B, Smiley A, Wang Y, Liu W, Larauche M, Million M, Damaser MS, Bourbeau DJ. A Flexible Implant for Multi-Day Monitoring of Colon Segment Activity. IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 2023; 17:941-951. [PMID: 37363840 PMCID: PMC10732233 DOI: 10.1109/tbcas.2023.3289768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Monitoring of colon activity is currently limited to tethered systems like anorectal manometry. These systems have significant drawbacks, but fundamentally limit the observation time of colon activity, reducing the likelihood of detecting specific clinical events. While significant technological advancement has been directed to mobile sensor capsules, this work describes the development and feasibility of a stationary sensor for describing the coordinated activity between neighboring segments of the colon. Unlike wireless capsules, this device remains in position and measures propagating pressure waves and impedances between colon segments to describe activity and motility. This low-power, flexible, wireless sensor-the colon monitor to capture activity (ColoMOCA) was validated in situ and in vivo over seven days of implantation. The ColoMOCA diameter was similar to common endoscopes to allow for minimally invasive diagnostic placement. The ColoMOCA included two pressure sensors, and three impedance-sensing electrodes arranged to describe the differential pressures and motility between adjacent colon segments. To prevent damage after placement in the colon, the ColoMOCA was fabricated with a flexible polyimide circuit board and a silicone rubber housing. The resulting device was highly flexible and suitable for surgical attachment to the colon wall. In vivo testing performed in eleven animals demonstrated suitability of both short term (less than 3 hours) and 7-day implantations. Data collected wirelessly from animal experiments demonstrated the ColoMOCA described colon activity similarly to wired catheters and allowed untethered, conscious monitoring of organ behavior.
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Li T, Morselli M, Su T, Million M, Larauche M, Pellegrini M, Taché Y, Yuan PQ. Comparative transcriptomics reveals highly conserved regional programs between porcine and human colonic enteric nervous system. Commun Biol 2023; 6:98. [PMID: 36693960 PMCID: PMC9872754 DOI: 10.1038/s42003-023-04478-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Accepted: 01/12/2023] [Indexed: 01/26/2023] Open
Abstract
The porcine gut is increasingly regarded as a useful translational model. The enteric nervous system in the colon coordinates diverse functions. However, knowledge of the molecular profiling of porcine enteric nerve system and its similarity to that of human is still lacking. We identified the distinct transcriptional programs associated with functional characteristics between inner submucosal and myenteric ganglia in porcine proximal and distal colon using bulk RNA and single-cell RNA sequencing. Comparative transcriptomics of myenteric ganglia in corresponding colonic regions of pig and human revealed highly conserved programs in porcine proximal and distal colon, which explained >96% of their transcriptomic responses to vagal nerve stimulation, suggesting that porcine proximal and distal colon could serve as predictors in translational studies. The conserved programs specific for inflammatory modulation were displayed in pigs with vagal nerve stimulation. This study provides a valuable transcriptomic resource for understanding of human colonic functions and neuromodulation using porcine model.
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Affiliation(s)
- Tao Li
- CURE/Digestive Diseases Research Center, Vatche and Tamar Manoukian Digestive Diseases Division, Department of Medicine, David Geffen School of Medicine, University of California at Los Angeles (UCLA), Los Angeles, USA
| | - Marco Morselli
- Department of Molecular, Cell, & Developmental Biology, UCLA, Los Angeles, USA
| | - Trent Su
- Department of Biological Chemistry, UCLA, Los Angeles, USA
| | - Mulugeta Million
- CURE/Digestive Diseases Research Center, Vatche and Tamar Manoukian Digestive Diseases Division, Department of Medicine, David Geffen School of Medicine, University of California at Los Angeles (UCLA), Los Angeles, USA
| | - Muriel Larauche
- CURE/Digestive Diseases Research Center, Vatche and Tamar Manoukian Digestive Diseases Division, Department of Medicine, David Geffen School of Medicine, University of California at Los Angeles (UCLA), Los Angeles, USA
| | - Matteo Pellegrini
- Department of Molecular, Cell, & Developmental Biology, UCLA, Los Angeles, USA
| | - Yvette Taché
- CURE/Digestive Diseases Research Center, Vatche and Tamar Manoukian Digestive Diseases Division, Department of Medicine, David Geffen School of Medicine, University of California at Los Angeles (UCLA), Los Angeles, USA
- VA Greater Los Angeles Healthcare System, Los Angeles, USA
| | - Pu-Qing Yuan
- CURE/Digestive Diseases Research Center, Vatche and Tamar Manoukian Digestive Diseases Division, Department of Medicine, David Geffen School of Medicine, University of California at Los Angeles (UCLA), Los Angeles, USA.
- VA Greater Los Angeles Healthcare System, Los Angeles, USA.
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Wang Y, Wang PM, Larauche M, Mulugeta M, Liu W. Bio-impedance method to monitor colon motility response to direct distal colon stimulation in anesthetized pigs. Sci Rep 2022; 12:13761. [PMID: 35961998 PMCID: PMC9374686 DOI: 10.1038/s41598-022-17549-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 07/27/2022] [Indexed: 11/09/2022] Open
Abstract
Electrical stimulation has been demonstrated as an alternative approach to alleviate intractable colonic motor disorders, whose effectiveness can be evaluated through colonic motility assessment. Various methods have been proposed to monitor the colonic motility and while each has contributed towards better understanding of colon motility, a significant limitation has been the spatial and temporal low-resolution colon motility data acquisition and analysis. This paper presents the study of employing bio-impedance characterization to monitor colonic motor activity. Direct distal colon stimulation was undertaken in anesthetized pigs to validate the bio-impedance scheme simultaneous with luminal manometry monitoring. The results indicated that the significant decreases of bio-impedance corresponded to strong colonic contraction in response to the electrical stimulation in the distal colon. The magnitude/power of the dominant frequencies of phasic colonic contractions identified at baseline (in the range 2-3 cycles per minute (cpm)) were increased after the stimulation. In addition, positive correlations have been found between bio-impedance and manometry. The proposed bio-impedance-based method can be a viable candidate for monitoring colonic motor pattern with high spatial and temporal resolution. The presented technique can be integrated into a closed-loop therapeutic device in order to optimize its stimulation protocol in real-time.
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Affiliation(s)
- Yushan Wang
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, USA
| | - Po-Min Wang
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, USA
| | - Muriel Larauche
- Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, CURE: Digestive Diseases Research Core Center (DDRCC), Center for Neurobiology of Stress and Resilience (CNSR), University of California, Los Angeles, Los Angeles, CA, USA.,VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | - Million Mulugeta
- Vatche and Tamar Manoukian Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, CURE: Digestive Diseases Research Core Center (DDRCC), Center for Neurobiology of Stress and Resilience (CNSR), University of California, Los Angeles, Los Angeles, CA, USA. .,VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA.
| | - Wentai Liu
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, USA. .,Department of Electrical and Computer Engineering, University of California, Los Angeles, Los Angeles, CA, USA. .,California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, USA. .,Brain Research Institute, University of California, Los Angeles, Los Angeles, CA, USA.
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Meerschaert KA, Davis BM, Smith-Edwards KM. New Insights on Extrinsic Innervation of the Enteric Nervous System and Non-neuronal Cell Types That Influence Colon Function. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1383:133-139. [PMID: 36587153 DOI: 10.1007/978-3-031-05843-1_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The enteric nervous system not only innervates the colon to execute various functions in a semi-autonomous manner but also receives neural input from three extrinsic sources, (1) vagal, (2) thoracolumbar (splanchnic), and (3) lumbosacral (pelvic) pathways, that permit bidirectional communication between the colon and central nervous system. Extrinsic pathways signal sensory input via afferent fibers, as well as motor autonomic output via parasympathetic or sympathetic efferent fibers, but the shared and unique roles for each pathway in executing sensory-motor control of colon function have not been well understood. Here, we describe the recently developed approaches that have provided new insights into the diverse mechanisms utilized by extrinsic pathways to influence colon functions related to visceral sensation, motility, and inflammation. Based on the cumulative results from anatomical, molecular, and functional studies, we propose pathway-specific functions for vagal, thoracolumbar, and lumbosacral innervation of the colon.
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Affiliation(s)
| | - Brian M Davis
- Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, USA
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