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Habago SD, Ordodi V, Bojin F, Vesa SC, Moldovan V, Paunescu V, Ionescu D. Inhibitory effects of lidocaine on colon carcinoma progression in a rat model: a pilot study. Br J Anaesth 2023; 131:e163-e165. [PMID: 37709556 DOI: 10.1016/j.bja.2023.07.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 07/27/2023] [Indexed: 09/16/2023] Open
Affiliation(s)
- Sergiu D Habago
- Department of Anaesthesia and Intensive Care, University of Medicine and Pharmacy "Iuliu Hatieganu", Cluj-Napoca, Romania; EuroPeriscope, The ESA-IC Onco-Anaesthesiology Research Group, Brussels, Belgium; Association for Research in Anesthesia and Intensive Care - ACATI, Cluj-Napoca, Romania.
| | - Valentin Ordodi
- CAICON Department, The Polytechnic University of Timisoara, Timisoara, Romania; OncoGen Research Centre, Timisoara, Romania
| | | | - Stefan C Vesa
- Department of Pharmacology, Toxicology and Clinical Pharmacology, University of Medicine and Pharmacy "Iuliu Hatieganu", Cluj-Napoca, Romania
| | | | | | - Daniela Ionescu
- Department of Anaesthesia and Intensive Care, University of Medicine and Pharmacy "Iuliu Hatieganu", Cluj-Napoca, Romania; EuroPeriscope, The ESA-IC Onco-Anaesthesiology Research Group, Brussels, Belgium; Association for Research in Anesthesia and Intensive Care - ACATI, Cluj-Napoca, Romania; Outcome Research Consortium, Cleveland, OH, USA
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Pinto N, Klein Y, David E, Polak D, Steinberg D, Mizrahi G, Khoury Y, Barenholz Y, Chaushu S. Resolvin D1 improves allograft osteointegration and directly enhances osteoblasts differentiation. Front Immunol 2023; 14:1086930. [PMID: 36923414 PMCID: PMC10008843 DOI: 10.3389/fimmu.2023.1086930] [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: 11/01/2022] [Accepted: 02/03/2023] [Indexed: 03/02/2023] Open
Abstract
Introduction Allografts are the most common bone grafts for repairing osseous defects. However, their use is associated with an increased risk for infections, donor disease transmission and osteointegration deficiency. Resolvin D1 (RvD1) is an endogenous lipid with a scientifically proven pivotal role in inflammation resolution and osteoclastogenesis inhibition. Yet, its biological relevance as a potential bone regenerative drug has been scarcely studied. Here, we aim to investigate the RvD1 effect on allograft osteointegration in the alveolar bone regeneration (ABR) murine model. Methods ABR model consisted of osseous defects that were generated by the extraction of the maxillary first molar in C57BL/6 mice. The sockets were filled with allograft and analyzed via RNA sequencing. Then they were locally injected with either RvD1 or saline via single or repeated administrations. The mice were sacrificed 2W after the procedure, and regenerated sites were analyzed using µCT and histology. First, MC3T3-E1 preosteoblasts were plated with IL-17 pro-inflammatory medium, and RANKL/OPG ratio was measured. Secondly, the MC3T3-E1 were cultured w/o RvD1, for 3W. Osteoblasts' markers were evaluated in different days, using qRT-PCR and Alizarin Red staining for calcified matrix. Results In vivo, neither allograft alone nor single RvD1 administration promote bone regeneration in comparison to the control of spontaneous healing and even triggered an elevation in NR1D1 and IL1RL1 expression, markers associated with inflammation and inhibition of bone cell differentiation. However, repeated RvD1 treatment increased bone content by 135.92% ± 45.98% compared to its specific control, repeated sham, and by 39.12% ± 26.3% when compared to the spontaneous healing control group (n=7/group). Histologically, repeated RvD1 reduced the number of TRAP-positive cells, and enhanced allograft osteointegration with new bone formation. In vitro, RvD1 rescued OPG expression and decreased RANKL/OPG ratio in IL-17 pro-inflammatory conditions. Furthermore, RvD1 increased the expression of RUNX2, OSX, BSP and OC/BGLAP2 and the mineralized extracellular matrix during MC3T3-E1 osteoblasts differentiation. Conclusions Repeated administrations of RvD1 promote bone regeneration via a dual mechanism: directly, via enhancement of osteoblasts' differentiation and indirectly, through reduction of osteoclastogenesis and RANKL/OPG ratio. This suggests that RvD1 may be a potential therapeutic bioagent for osseous regeneration following allograft implantation.
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Affiliation(s)
- Noy Pinto
- Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.,Institute for Medical Research Israel-Canada, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Yehuda Klein
- Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.,Institute for Medical Research Israel-Canada, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.,Department of Orthodontics, Hadassah Medical Center, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Eilon David
- Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.,Institute for Medical Research Israel-Canada, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - David Polak
- Department of Periodontics, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Daniel Steinberg
- The Lautenberg Center for Immunology and Cancer Research, Department of Immunology and Cancer Research-Medical Research, Israel-Canada (IMRIC), Jerusalem, Israel.,Department of Developmental Biology and Cancer Research, Institute for Medical Research Israel-Canada, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Gilad Mizrahi
- Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.,Department of Orthodontics, Hadassah Medical Center, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Yasmin Khoury
- Institute of Dental Sciences, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Yechezkel Barenholz
- Institute for Medical Research Israel-Canada, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
| | - Stella Chaushu
- Department of Orthodontics, Hadassah Medical Center, Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
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3
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Shi S, Gan L, Jin CN, Liu RF. Effects of propofol combined with lidocaine on hemodynamics, serum adrenocorticotropic hormone, interleukin-6, and cortisol in children. World J Clin Cases 2022; 10:8506-8513. [PMID: 36157832 PMCID: PMC9453372 DOI: 10.12998/wjcc.v10.i24.8506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 03/17/2022] [Accepted: 07/17/2022] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Children are a unique patient population. Anesthesia for pediatric abdominal surgery has long been achieved mainly with intravenous amiodarone and propofol alone or combined with other anesthetics. The incidence of complications and postoperative adverse reactions is relatively high owing to the imperfect development of various protocols for children. Choosing the most appropriate anesthesia program is an important means of reducing adverse reactions.
AIM To explore the clinical value of propofol combined with lidocaine-assisted anesthesia in pediatric surgery.
METHODS A total of 120 children who underwent abdominal surgery at our hospital from January 2016 to March 2018 were selected and divided into groups A and B using the random number table method, with 60 patients in each group. Group B received ketamine for anesthesia, while group A received ketamine, propofol, and lidocaine. The pre- and postoperative heart rate (HR); mean arterial pressure (MAP); arterial oxygen saturation (SpO2); serum adrenocorticotropic hormone (ACTH), interleukin-6 (IL-6), and cortisol (Cor) levels; restlessness score during the recovery period [Paediatric Anesthesia Emergence Delirium Scale (PAED)]; and adverse reactions were compared between the two groups.
RESULTS The HR, MAP, and SpO2 Level at five minutes before initiating anesthesia were compared between groups A and B, and the difference was not statistically significant (P > 0.05). At 10 and 20 minutes after anesthesia initiation, the HR and MAP were lower in group A compared with group B (P < 0.05). The differences in preoperative serum ACTH, IL-6, and Cor levels between groups A and B were not statistically significant (P > 0.05); however, the postoperative serum ACTH, IL-6, and Cor levels in group A were lower compared with group B (P < 0.05). Furthermore, the visual analog scale scores of group A at 2 h and 8 h postoperative were lower than those in group B, and the differences were statistically significant (P < 0.05). The mean PAED score in group A was lower than that in group B (P < 0.05), and the incidence of restlessness in group A was 23.33% lower than that in group B (36.67 %) (P < 0.05). The incidence of adverse reactions was lower in group A than in group B (6.25% vs 16.25%).
CONCLUSION The anesthetic effect of propofol combined with lidocaine and ketamine in pediatric surgery was better than that of ketamine alone, and had less influence on hemodynamics and pediatric stress response indices, lower incidence of restlessness in the recovery period, and lower incidence of adverse reactions.
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Affiliation(s)
- Song Shi
- Department of Anesthesiology, Affiliated Hospital of Hebei University, Baoding 071000, Hebei Province, China
| | - Lu Gan
- Department of Anesthesiology, Affiliated Hospital of Hebei University, Baoding 071000, Hebei Province, China
| | - Chun-Nv Jin
- Department of Anesthesiology, Baoding Maternal and Child Health Hospital, Baoding 071000, Hebei Province, China
| | - Rong-Fang Liu
- Department of Anesthesiology, Affiliated Hospital of Hebei University, Baoding 071000, Hebei Province, China
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Integrated Excitatory/Inhibitory Imbalance and Transcriptomic Analysis Reveals the Association between Dysregulated Synaptic Genes and Anesthetic-Induced Cognitive Dysfunction. Cells 2022; 11:cells11162497. [PMID: 36010580 PMCID: PMC9406780 DOI: 10.3390/cells11162497] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/03/2022] [Accepted: 08/10/2022] [Indexed: 11/24/2022] Open
Abstract
Emerging evidence from human epidemiologic and animal studies has demonstrated that developmental anesthesia neurotoxicity could cause long-term cognitive deficits and behavioral problems. However, the underlying mechanisms remain largely unknown. We conducted an electrophysiological analysis of synapse activity and a transcriptomic assay of 24,881 mRNA expression on hippocampal tissues from postnatal day 60 (P60) mice receiving propofol exposure at postnatal day 7 (P7). We found that developmentally propofol-exposed P60 mouse hippocampal neurons displayed an E/I imbalance, compared with control mice as evidenced by the decreased excitation and increased inhibition. We found that propofol exposure at P7 led to the abnormal expression of 317 mRNAs in the hippocampus of P60 mice, including 23 synapse-related genes. Various bioinformatic analyses revealed that these abnormally expressed synaptic genes were associated with the function and development of synapse activity and plasticity, E/I balance, behavior, and cognitive impairment. Our findings suggest that the altered E/I balance may constitute a mechanism for propofol-induced long-term impaired learning and memory in mice. The transcriptomic and bioinformatic analysis of these dysregulated genes related to synaptic function paves the way for development of therapeutic strategies against anesthetic neurodegeneration through the restoration of E/I balance and the modification of synaptic gene expression.
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Opioid-Sparing Analgesia Impacts the Perioperative Anesthetic Management in Major Abdominal Surgery. Medicina (B Aires) 2022; 58:medicina58040487. [PMID: 35454326 PMCID: PMC9029402 DOI: 10.3390/medicina58040487] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 03/23/2022] [Accepted: 03/26/2022] [Indexed: 12/13/2022] Open
Abstract
Background and Objectives: The management of acute postoperative pain (APP) following major abdominal surgery implies various analgetic strategies. Opioids lie at the core of every analgesia protocol, despite their side effect profile. To limit patients’ exposure to opioids, considerable effort has been made to define new opioid-sparing anesthesia techniques relying on multimodal analgesia. Our study aims to investigate the role of adjuvant multimodal analgesic agents, such as ketamine, lidocaine, and epidural analgesia in perioperative pain control, the incidence of postoperative cognitive dysfunction (POCD), and the incidence of postoperative nausea and vomiting (PONV) after major abdominal surgery. Materials and Methods: This is a clinical, observational, randomized, monocentric study, in which 80 patients were enrolled and divided into three groups: Standard group, C (n = 32), where patients received perioperative opioids combined with a fixed regimen of metamizole/acetaminophen for pain control; co-analgetic group, Co-A (n = 26), where, in addition to standard therapy, patients received perioperative systemic ketamine and lidocaine; and the epidural group, EA (n = 22), which included patients that received standard perioperative analgetic therapy combined with epidural analgesia. We considered the primary outcome, the postoperative pain intensity, assessed by the visual analogue scale (VAS) at 1 h, 6 h, and 12 h postoperatively. The secondary outcomes were the total intraoperative fentanyl dose, total postoperative morphine dose, maximal intraoperative sevoflurane concentration, confusion assessment method for intensive care units score (CAM-ICU) at 1 h, 6 h, and 12 h postoperatively, and the postoperative dose of ondansetron as a marker for postoperative nausea and vomiting (PONV) severity. Results: We observed a significant decrease in VAS score, as the primary outcome, for both multimodal analgesic regimens, as compared to the control. Moreover, the intraoperative fentanyl and postoperative morphine doses were, consequently, reduced. The maximal sevoflurane concentration and POCD were reduced by EA. No differences were observed between groups concerning PONV severity. Conclusions: Multimodal analgesia concepts should be individualized based on the patient’s needs and consent. Efforts should be made to develop strategies that can aid in the reduction of opioid use in a perioperative setting and improve the standard of care.
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Nguyen KG, Wagner ES, Vrabel MR, Mantooth SM, Meritet DM, Zaharoff DA. Safety and Pharmacokinetics of Intravesical Chitosan/Interleukin-12 Immunotherapy in Murine Bladders. Bladder Cancer 2021; 7:427-437. [PMID: 38993985 PMCID: PMC11181725 DOI: 10.3233/blc-211542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 09/30/2021] [Indexed: 11/15/2022]
Abstract
BACKGROUND Intravesical administration of interleukin 12 (IL-12) co-formulated with the biopolymer, chitosan (CS/IL-12), has demonstrated remarkable antitumor activity against preclinical models of bladder cancer. However, given historical concerns regarding severe toxicities associated with systemic IL-12 administration in clinical trials, it is important to evaluate the safety of intravesical CS/IL-12 prior to clinical translation. OBJECTIVE To evaluate the pharmacokinetics as well as the local and systemic toxicities of intravesical CS/IL-12 immunotherapy in laboratory mice. METHODS Local inflammatory responses in mouse bladders treated with intravesical IL-12 or CS/IL-12 were assessed via histopathology. Serum cytokine levels following intravesical and subcutaneous (s.c.) administrations of IL-12 or CS/IL-12 in laboratory mice were compared. Systemic toxicities were evaluated via body weight and liver enzyme levels. RESULTS Intravesical IL-12 and CS/IL-12 treatments did not induce significant local or systemic toxicity. IL-12 dissemination and exposure from intravesical administration was significantly lower compared to s.c. injections. Weekly intravesical CS/IL-12 treatments were well-tolerated and did not result in blunted immune responses. CONCLUSIONS Intravesical CS/IL-12 is safe and well-tolerated in mice. In particular, the lack of cystitis and acute inflammation justifies continued investigation of intravesical CS/IL-12 immunotherapy in larger animals and patients with bladder cancer.
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Affiliation(s)
- Khue G. Nguyen
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina-Chapel Hill, Raleigh, NC, USA
| | - Ethan S. Wagner
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina-Chapel Hill, Raleigh, NC, USA
| | - Maura R. Vrabel
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina-Chapel Hill, Raleigh, NC, USA
| | - Siena M. Mantooth
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina-Chapel Hill, Raleigh, NC, USA
| | - Danielle M. Meritet
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
| | - David A. Zaharoff
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina-Chapel Hill, Raleigh, NC, USA
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Gerb SA, Dashek RJ, Ericsson AC, Griffin R, Franklin CL. The Effects of Ketamine on the Gut Microbiome on CD1 Mice. Comp Med 2021; 71:295-301. [PMID: 34301347 DOI: 10.30802/aalas-cm-20-000117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The intestinal microbiota of an organism can significantly alter outcome data in otherwise identical experiments. Occasionally, animals may require sedation or anesthesia for scientific or health-related purposes, and certain anesthetics, such as ketamine, can profoundly affect the gastrointestinal system. While many factors can alter the gut microbiome (GM), the effects of anesthetics on the composition or diversity of the GM have not been established. The goal of the current study was to determine whether daily administration of ketamine would significantly alter the microbiome of CD1 mice. To achieve this goal, female CD1 mice received daily injections of ketamine HCl (100 mg/kg) or the equivalent volume of 0.9% saline for 10 consecutive days. Fecal samples were collected before the first administration and 24 h after the final dose of either ketamine or saline. Samples were analyzed by 16S rRNA sequencing to identify changes between groups in diversity or composition of GM. The study found no significant changes to the GM after serial ketamine administration when treated mice were housed with controls. Therefore, ketamine administration is unlikely to alter the GM of a CD1 mouse and should not serve be a confounding factor in reproducibility of research.
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Affiliation(s)
- Samantha A Gerb
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri
| | - Ryan J Dashek
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri
| | - Aaron C Ericsson
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri; MU Metagenomics Center, University of Missouri, Columbia, Missouri; MU Mutant Mouse Resource and Research Center, University of Missouri, Columbia, Missouri
| | - Rachel Griffin
- Michigan State College of Veterinary Medicine, East Lancing, Michigan
| | - Craig L Franklin
- Department of Veterinary Pathobiology, University of Missouri, Columbia, Missouri; MU Metagenomics Center, University of Missouri, Columbia, Missouri; MU Mutant Mouse Resource and Research Center, University of Missouri, Columbia, Missouri;,
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Navarro KL, Huss M, Smith JC, Sharp P, Marx JO, Pacharinsak C. Mouse Anesthesia: The Art and Science. ILAR J 2021; 62:238-273. [PMID: 34180990 PMCID: PMC9236661 DOI: 10.1093/ilar/ilab016] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 02/04/2021] [Accepted: 12/01/2020] [Indexed: 12/15/2022] Open
Abstract
There is an art and science to performing mouse anesthesia, which is a significant component to animal research. Frequently, anesthesia is one vital step of many over the course of a research project spanning weeks, months, or beyond. It is critical to perform anesthesia according to the approved research protocol using appropriately handled and administered pharmaceutical-grade compounds whenever possible. Sufficient documentation of the anesthetic event and procedure should also be performed to meet the legal, ethical, and research reproducibility obligations. However, this regulatory and documentation process may lead to the use of a few possibly oversimplified anesthetic protocols used for mouse procedures and anesthesia. Although a frequently used anesthetic protocol may work perfectly for each mouse anesthetized, sometimes unexpected complications will arise, and quick adjustments to the anesthetic depth and support provided will be required. As an old saying goes, anesthesia is 99% boredom and 1% sheer terror. The purpose of this review article is to discuss the science of mouse anesthesia together with the art of applying these anesthetic techniques to provide readers with the knowledge needed for successful anesthetic procedures. The authors include experiences in mouse inhalant and injectable anesthesia, peri-anesthetic monitoring, specific procedures, and treating common complications. This article utilizes key points for easy access of important messages and authors’ recommendation based on the authors’ clinical experiences.
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Affiliation(s)
- Kaela L Navarro
- Department of Comparative Medicine, Stanford University, Stanford, California, USA
| | - Monika Huss
- Department of Comparative Medicine, Stanford University, Stanford, California, USA
| | - Jennifer C Smith
- Bioresources Department, Henry Ford Health System, Detroit, Michigan, USA
| | - Patrick Sharp
- Office of Research and Economic Development, University of California, Merced, California, USA
- Animal Resources Authority, Murdoch, Australia
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia, Australia
| | - James O Marx
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Cholawat Pacharinsak
- Corresponding Author: Cholawat Pacharinsak, DVM, PhD, DACVAA, Stanford University, Department of Comparative Medicine, 287 Campus Drive, Stanford, CA 94305-5410, USA. E-mail:
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Segers C, Mysara M, Claesen J, Baatout S, Leys N, Lebeer S, Verslegers M, Mastroleo F. Intestinal mucositis precedes dysbiosis in a mouse model for pelvic irradiation. ISME COMMUNICATIONS 2021; 1:24. [PMID: 36737646 PMCID: PMC9723693 DOI: 10.1038/s43705-021-00024-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 05/12/2021] [Accepted: 05/25/2021] [Indexed: 02/07/2023]
Abstract
Pelvic radiotherapy is known to evoke intestinal mucositis and dysbiosis. Currently, there are no effective therapies available to mitigate these injuries, which is partly due to a lack of insight into the events causing mucositis and dysbiosis. Here, the complex interplay between the murine host and its microbiome following pelvic irradiation was mapped by characterizing intestinal mucositis along with extensive 16S microbial profiling. We demonstrated important morphological and inflammatory implications within one day after exposure, thereby impairing intestinal functionality and inducing translocation of intraluminal bacteria into mesenteric lymph nodes as innovatively quantified by flow cytometry. Concurrent 16S microbial profiling revealed a delayed impact of pelvic irradiation on beta diversity. Analysis of composition of microbiomes identified biomarkers for pelvic irradiation. Among them, members of the families Ruminococcaceae, Lachnospiraceae and Porphyromonadaceae were differentially affected. Altogether, our unprecedented findings showed how pelvic irradiation evoked structural and functional changes in the intestine, which secondarily resulted in a microbiome shift. Therefore, the presented in vivo irradiation-gut-microbiome platform allows further research into the pathobiology of pelvic irradiation-induced intestinal mucositis and resultant dysbiosis, as well as the exploration of mitigating treatments including drugs and food supplements.
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Affiliation(s)
- Charlotte Segers
- Interdisciplinary Biosciences group, Belgian Nuclear Research Centre SCK CEN, Mol, Belgium
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Mohamed Mysara
- Interdisciplinary Biosciences group, Belgian Nuclear Research Centre SCK CEN, Mol, Belgium
| | - Jürgen Claesen
- Interdisciplinary Biosciences group, Belgian Nuclear Research Centre SCK CEN, Mol, Belgium
- Department of Epidemiology and Data Science, Amsterdam UMC, VU University Amsterdam, Amsterdam, The Netherlands
| | - Sarah Baatout
- Interdisciplinary Biosciences group, Belgian Nuclear Research Centre SCK CEN, Mol, Belgium
- Department of Biotechnology, University of Ghent, Ghent, Belgium
| | - Natalie Leys
- Interdisciplinary Biosciences group, Belgian Nuclear Research Centre SCK CEN, Mol, Belgium
| | - Sarah Lebeer
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Mieke Verslegers
- Interdisciplinary Biosciences group, Belgian Nuclear Research Centre SCK CEN, Mol, Belgium
| | - Felice Mastroleo
- Interdisciplinary Biosciences group, Belgian Nuclear Research Centre SCK CEN, Mol, Belgium.
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Hibl BM, Dailey Garnes NJM, Kneubehl AR, Vogt MB, Spencer Clinton JL, Rico-Hesse RR. Mosquito-bite infection of humanized mice with chikungunya virus produces systemic disease with long-term effects. PLoS Negl Trop Dis 2021; 15:e0009427. [PMID: 34106915 PMCID: PMC8189471 DOI: 10.1371/journal.pntd.0009427] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 05/02/2021] [Indexed: 12/13/2022] Open
Abstract
Chikungunya virus (CHIKV) is an emerging, mosquito-borne alphavirus responsible for acute to chronic arthralgias and neuropathies. Although it originated in central Africa, recent reports of disease have come from many parts of the world, including the Americas. While limiting human CHIKV cases through mosquito control has been used, it has not been entirely successful. There are currently no licensed vaccines or treatments specific for CHIKV disease, thus more work is needed to develop effective countermeasures. Current animal research on CHIKV is often not representative of human disease. Most models use CHIKV needle inoculation via unnatural routes to create immediate viremia and localized clinical signs; these methods neglect the natural route of transmission (the mosquito vector bite) and the associated human immune response. Since mosquito saliva has been shown to have a profound effect on viral pathogenesis, we evaluated a novel model of infection that included the natural vector, Aedes species mosquitoes, transmitting CHIKV to mice containing components of the human immune system. Humanized mice infected by 3-6 mosquito bites showed signs of systemic infection, with demonstrable viremia (by qRT-PCR and immunofluorescent antibody assay), mild to moderate clinical signs (by observation, histology, and immunohistochemistry), and immune responses consistent with human infection (by flow cytometry and IgM ELISA). This model should give a better understanding of human CHIKV disease and allow for more realistic evaluations of mechanisms of pathogenesis, prophylaxis, and treatments.
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Affiliation(s)
- Brianne M. Hibl
- Center for Comparative Medicine, Baylor College of Medicine, Houston, Texas, United States of America
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Natalie J. M. Dailey Garnes
- Section of Infectious Disease, Department of Internal Medicine, Baylor College of Medicine, Houston, Texas, United States of America
- Section of Pediatric Infectious Diseases, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, United States of America
| | - Alexander R. Kneubehl
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Megan B. Vogt
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, United States of America
- Integrative Molecular and Biomedical Sciences Graduate Program, Baylor College of Medicine, Houston, Texas, United States of America
| | - Jennifer L. Spencer Clinton
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Rebecca R. Rico-Hesse
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, United States of America
- * E-mail:
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Gergye CH, Zhao Y, Moore RH, Lee VK. A Comparison of Ketamine or Etomidate Combined with Xylazine for Intraperitoneal Anesthesia in Four Mouse Strains. JOURNAL OF THE AMERICAN ASSOCIATION FOR LABORATORY ANIMAL SCIENCE 2020; 59:519-530. [PMID: 32723425 DOI: 10.30802/aalas-jaalas-19-000129] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Intraperitoneal (IP) injection is a common route of anesthetic administration in mice. Ketamine-xylazine (KX) anesthesia is one of the most widely used IP protocols, but has limitations. Etomidate is an alternative to ketamine that has been used in both human and veterinary medicine yet has not been widely studied in mice. The purpose of this study was to evaluate etomidate-xylazine (EX) anesthesia as an alternative to KX. We hypothesized that EX would be as safe and effective as KX, with both sex- and strain-dependent differences. Male and female Crl:CD1(ICR), C57BL/6NCrl, BALB/cJ and NU/J mice were given a single IP dose of ketamine 100 mg/kg and xylazine 10 mg/kg or etomidate 20 mg/kg and xylazine 10 mg/kg. Sedation times were similar between KX and EX, with CD1 mice exhibiting shorter sedation times. Surgical anesthesia was achieved in 44% of EX mice, compared with 4% of KX mice. C57BL/6NCrl mice were significantly more likely to achieve surgical anesthesia when given EX (94%) or KX (18%) than were other strains. In all strains except C57BL/6NCrl mice, females were more likely to reach surgical anesthesia than males. Several mice experienced an adverse hyperexcitement response during induction, with BALB/cJ (79%) and NU/J (87%) mice given EX significantly more likely than other strains to experience hyperexcitement. EX and KX protocols had no overall differences in lowest respiration rate, lowest systolic blood pressure, lowest rectal temperature, or levels of acidosis, although the lowest heart rates were significantly higher with EX, indicating that EX and KX have similar safety profiles. Thus, EX and KX administration were associated with several significant physiologic differences when comparing sexes or individual strains. Our results indicate that EX is an equally effective sedative and a more effective surgical anesthetic than KX; however, EX is only recommended for invasive procedures in C57BL/6 mice due to the high rate of hyper-excitement and inconsistent surgical depth seen in other strains. Further study is needed to optimize EX for use in multiple mouse strains.
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Affiliation(s)
- Crystal H Gergye
- Division of Animal Resources, Emory University, Atlanta, Georgia;,
| | - Yixuan Zhao
- Department of Biostatistics and Bioinformatics, Biostatistics Collaboration Core, Emory University, Atlanta, Georgia
| | - Reneé H Moore
- Department of Biostatistics and Bioinformatics, Biostatistics Collaboration Core, Emory University, Atlanta, Georgia
| | - Vanessa K Lee
- Division of Animal Resources, Emory University, Atlanta, Georgia
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12
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Saganuwan SA. Chirality of Central Nervous System (CNS) Acting Drugs: A Formidable Therapeutic Hurdle Against CNS Diseases. Cent Nerv Syst Agents Med Chem 2020; 19:171-179. [PMID: 31232237 DOI: 10.2174/1871524919666190624150214] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 05/31/2019] [Accepted: 06/10/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Over fifty percent of drugs being used clinically are chiral and 90% of them are racemates. Unfortunately, they have both adverse and beneficial effects on body systems. METHODS Because of the erratic effects of chiral compounds on body functional systems, literature search was carried out with a view to identify CNS chiral drugs, their clinical advantages and disadvantages, unique physicochemical properties and structural modifications into safer drugs. RESULTS Findings have shown that majority of CNS and non-CNS acting drugs have chiral functional groups that may occur as either dextrorotatory (clockwise) or levorotatory (anticlockwise) or racemates which are inert. Sometimes, the enantiomers (optical isomers) could undergo keto-enol tautomerism, appearing in either acidic or basic or inert form. Chiral CNS acting drugs have agonistic and antagonistic effects, clinical advantages, disadvantages, and special clinical applications, possible modifications for better therapeutic effects and possible synthesis of more potent drugs from racemates. Clockwise chirality may be more effective and safer than the drugs with anticlockwise chirality. When chiral drugs are in racemate state they become inert and may be safer than when they are single. Also, diastereoisomers may be more dangerous than stereoisomers. CONCLUSION Therefore, chiral compounds should be adequately studied in lab rodents and primates, and their mechanisms of actions should be comprehensively understood before being used in clinical setting. Since many of them are toxic, their use should be based on principle of individualized medicine. Their molecular weights, functional groups, metabolites, polymers and stereoisomers could be valuable tools for their modifications.
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Affiliation(s)
- Saganuwan Alhaji Saganuwan
- Department of Veterinary Physiology, Pharmacology and Biochemistry, College of Veterinary Medicine, Federal University of Agriculture, P.M.B. 2373, Makurdi, Benue State, Nigeria
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LaTourette PC, David EM, Pacharinsak C, Jampachaisri K, Smith JC, Marx JO. Effects of Standard and Sustained-release Buprenorphine on the Minimum Alveolar Concentration of Isoflurane in C57BL/6 Mice. JOURNAL OF THE AMERICAN ASSOCIATION FOR LABORATORY ANIMAL SCIENCE 2020; 59:298-304. [PMID: 32268932 DOI: 10.30802/aalas-jaalas-19-000106] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Both standard and sustained-release injectable formulations of buprenorphine (Bup and BupSR, respectively) are used as preemptive analgesics, potentially affecting gas anesthetic requirements. This study tested the effects of Bup and BupSR on isoflurane requirements and confirmed that buprenorphine could reduce isoflurane requirements during a laparotomy in mice. We hypothesized that both Bup and BupSR would significantly decrease the required minimum alveolar concentration (MAC) of isoflurane. C57BL/6 mice received either isotonic crystalloid fluid (control), Bup (0.1 mg/kg), or BupSR (1.2 mg/kg) subcutaneously 10 min prior to the induction of anesthesia. Each anesthetized mouse was tested at 2 isoflurane concentrations. A 300-g noxious stimulus was applied at each isoflurane concentration, alternating between hindfeet. In addition, a subset of mice underwent terminal laparotomy or 60 min of anesthesia after injection with Bup, BupSR, or saline to ensure an appropriate surgical plane of anesthesia. Mice were maintained at the lowest isoflurane concentration that resulted in 100% of mice at a surgical plane from the aforementioned MAC experiments (control, 2.0%; Bup and BupSR, 1.7%). Analysis showed that both Bup and BupSR significantly decreased isoflurane requirements by 25.5% and 14.4%, respectively. The isoflurane MAC for the control injection was 1.80% ± 0.09%; whereas Bup and BupSR decreased MAC to 1.34% ± 0.08% and 1.54% ± 0.09%, respectively. Sex was not a significantly different between the injection groups during MAC determination. All of the mice that underwent surgery achieved a surgical plane of anesthesia on the prescribed regimen and recovered normally after discontinuation of isoflurane. Lastly, heart and respiratory rates did not differ between mice that underwent surgery and those that were anesthetized only. Bup and BupSR are MAC-sparing in male and female C57BL/6 mice and can be used for effective multimodal anesthesia.
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Affiliation(s)
- Philip C LaTourette
- University Laboratory Animal Resources, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania
| | - Emily M David
- University Laboratory Animal Resources, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania
| | | | | | - Jennifer C Smith
- Bioresources Department, Henry Ford Health System, Detroit, Michigan
| | - James O Marx
- University Laboratory Animal Resources, University of Pennsylvania, Philadelphia, Pennsylvania; Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania;,
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Fang H, Li HF, Yang M, Zhang FX, Liao R, Wang RR, Wang QY, Zheng PC, Zhang JP. Effect of ketamine combined with lidocaine in pediatric anesthesia. J Clin Lab Anal 2019; 34:e23115. [PMID: 31733006 PMCID: PMC7171319 DOI: 10.1002/jcla.23115] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 10/21/2019] [Accepted: 10/22/2019] [Indexed: 02/05/2023] Open
Abstract
Background We conducted a randomized clinical trial to determine whether adjunctive lidocaine diminishes the incidence of adverse effects in pediatric patients sedated with ketamine. Methods This case‐control study involved 586 consecutive pediatric patients necessitating anesthesia. Then systolic blood pressure, heart rate, respiratory rate, and blood oxygen saturation were observed. Alanine aminotransferase (ALT), aspartate aminotransferase (AST), urea nitrogen (BUN), and creatinine (Cr) levels were tested. General dose of ketamine, the time of onset and duration of anesthesia and postoperative recovery, anesthesia effect, and adverse reaction were subsequently compared. High‐performance liquid chromatography was employed to detect ketamine concentration at different time points after administration, and the postoperative cognition function was further evaluated. Results Intra‐ and post‐operation, the rising degree of ALT, AST, BUN, and Cr in patients treated with ketamine was higher than those in patients treated with the ketamine‐lidocaine complex. General dose of ketamine, the time of onset and duration of anesthesia, postoperative recovery time, and the incidence rate of adverse reaction in patients treated with ketamine‐lidocaine complex were lower, but the concentration of ketamine was higher compared to the patients treated with ketamine. In patients treated with the ketamine‐lidocaine complex, elimination half‐life of ketamine was prolonged, the area under curve was increased, and the plasma clearance rate was decreased relative to those with ketamine alone. Conclusions Ketamine combined with lidocaine may be beneficial in shortening the onset of anesthesia, promoting postoperative awake, prolonging elimination half‐life, increasing area under curve, and decreasing plasma clearance rate and incidence of adverse reactions.
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Affiliation(s)
- Hua Fang
- Department of Anesthesiology, Guizhou Provincial People's Hospital, Guiyang, China.,Department of Anesthesiology, Guizhou University People's Hospital, Guiyang, China
| | - Hua-Feng Li
- Department of Anesthesiology, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Miao Yang
- Department of Anesthesiology, Guizhou Provincial People's Hospital, Guiyang, China.,Department of Anesthesiology, Guizhou University People's Hospital, Guiyang, China
| | - Fang-Xiang Zhang
- Department of Anesthesiology, Guizhou Provincial People's Hospital, Guiyang, China.,Department of Anesthesiology, Guizhou University People's Hospital, Guiyang, China
| | - Ren Liao
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Ru-Rong Wang
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Quan-Yun Wang
- Department of Anesthesiology, West China Hospital, Sichuan University, Chengdu, China
| | - Peng-Cheng Zheng
- Guizhou University Research Center for Analysis of Drugs and Metabolites, Guizhou University, Guiyang, China
| | - Jian-Ping Zhang
- Department of Anesthesiology, Guizhou Provincial People's Hospital, Guiyang, China.,Department of Anesthesiology, Guizhou University People's Hospital, Guiyang, China
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Schuetze S, Manig A, Ribes S, Nau R. Aged mice show an increased mortality after anesthesia with a standard dose of ketamine/xylazine. Lab Anim Res 2019; 35:8. [PMID: 32257896 PMCID: PMC7081538 DOI: 10.1186/s42826-019-0008-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 07/04/2019] [Indexed: 01/28/2023] Open
Abstract
Geriatric animal models are crucial for a better understanding and an improved therapy of age-related diseases. We observed a high mortality of aged mice after anesthesia with a standard dose of ketamine/xylazine, an anesthetic regimen frequently used in laboratory veterinary medicine. C57BL/6-N mice at the age of 2.14 ± 0.23 months (young mice) and 26.31 ± 2.15 months (aged mice) were anesthetized by intraperitoneal injection of 2 mg ketamine and 0.2 mg xylazine. 4 of 26 aged mice (15.4%) but none of 26 young mice died within 15 min after injection of the anesthetics. The weight of aged mice was significantly higher than that of young mice (32.8 ± 5.4 g versus 23.2 ± 3.4 g, p < 0.0001). Thus, aged mice received lower doses of anesthetics in relation to their body weight which are within the lower range of doses recommended in the literature or even beneath. There were no differences between deceased and surviving aged mice concerning their sex, weight and their motor performance prior to anesthesia. Our data clearly show an age-related increase of mortality upon anesthesia with low standard doses of ketamine/xylazine. Assessment of weight and motor performance did not help to predict vulnerability of aged mice to the anesthetics. Caution is necessary when this common anesthetic regimen is applied in aged mice: lower doses or the use of alternative anesthetics should be considered to avoid unexpected mortality. The present data from our geriatric mouse model strongly corroborate an age-adjusted reduction of anesthetic doses to reduce anesthesia-related mortality in aged individuals.
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Affiliation(s)
- Sandra Schuetze
- 1Institute of Neuropathology, University Medical Center Göttingen, Robert-Koch-Str. 40, D-37075 Göttingen, Germany.,2Department of Geriatrics, AGAPLESION Frankfurter Diakonie Kliniken, 60431 Frankfurt am Main, Germany
| | - Anja Manig
- 1Institute of Neuropathology, University Medical Center Göttingen, Robert-Koch-Str. 40, D-37075 Göttingen, Germany.,3Department of Clinical Neurophysiology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Sandra Ribes
- 1Institute of Neuropathology, University Medical Center Göttingen, Robert-Koch-Str. 40, D-37075 Göttingen, Germany
| | - Roland Nau
- 1Institute of Neuropathology, University Medical Center Göttingen, Robert-Koch-Str. 40, D-37075 Göttingen, Germany.,4Department of Geriatrics, Evangelisches Krankenhaus Göttingen-Weende, 37075 Göttingen, Germany
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Logan S, Jiang C, Yan Y, Inagaki Y, Arzua T, Bai X. Propofol Alters Long Non-Coding RNA Profiles in the Neonatal Mouse Hippocampus: Implication of Novel Mechanisms in Anesthetic-Induced Developmental Neurotoxicity. Cell Physiol Biochem 2018; 49:2496-2510. [PMID: 30261491 DOI: 10.1159/000493875] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Accepted: 09/18/2018] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Propofol induces acute neurotoxicity (e.g., neuroapoptosis) followed by impairment of long-term memory and learning in animals. However, underlying mechanisms remain largely unknown. Long non-coding RNAs (lncRNAs) are found to participate in various pathological processes. We hypothesized that lncRNA profile and the associated signaling pathways were altered, and these changes might be related to the neurotoxicity observed in the neonatal mouse hippocampus following propofol exposure. METHODS In this laboratory experiment, 7-day-old mice were exposed to a subanesthetic dose of propofol for 3 hours, with 4 animals per group. Hippocampal tissues were harvested 3 hours after propofol administration. Neuroapoptosis was analyzed based on caspase 3 activity using a colorimetric assay. A microarray was performed to investigate the profiles of 35,923 lncRNAs and 24,881 messenger RNAs (mRNAs). Representative differentially expressed lncRNAs and mRNAs were validated using reverse transcription quantitative polymerase chain reaction. All mRNAs dysregulated by propofol and the 50 top-ranked, significantly dysregulated lncRNAs were subject to bioinformatics analysis for exploring the potential mechanisms and signaling network of propofol-induced neurotoxicity. RESULTS Propofol induced neuroapoptosis in the hippocampus, with differential expression of 159 lncRNAs and 100 mRNAs (fold change ± 2.0, P< 0.05). Bioinformatics analysis demonstrated that these lncRNAs and their associated mRNAs might participate in neurodegenerative pathways (e.g., calcium handling, apoptosis, autophagy, and synaptogenesis). CONCLUSION This novel report emphasizes that propofol alters profiles of lncRNAs, mRNAs, and their cooperative signaling network, which provides novel insights into molecular mechanisms of anesthetic-induced developmental neurodegeneration and preventive targets against the neurotoxicity.
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Affiliation(s)
- Sarah Logan
- Department of Cell Biology, Neurobiology & Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.,Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Congshan Jiang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Science, Xi'an Jiaotong University Health Science Center, Xian, China
| | - Yasheng Yan
- Department of Cell Biology, Neurobiology & Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Yasuyoshi Inagaki
- Department of Emergency Medicine, Nayoro City General Hospital, Nayoro, Japan
| | - Thiago Arzua
- Department of Cell Biology, Neurobiology & Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.,Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Xiaowen Bai
- Department of Cell Biology, Neurobiology & Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
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Hohlbaum K, Bert B, Dietze S, Palme R, Fink H, Thöne-Reineke C. Impact of repeated anesthesia with ketamine and xylazine on the well-being of C57BL/6JRj mice. PLoS One 2018; 13:e0203559. [PMID: 30231081 PMCID: PMC6145541 DOI: 10.1371/journal.pone.0203559] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 08/22/2018] [Indexed: 12/11/2022] Open
Abstract
Within the scope of the 3Rs of Russel and Burch, the number of laboratory animals can be reduced by repeated use of an animal. This strategy only becomes relevant, if the total amount of pain, distress or harm the individual animal experiences does not exceed the severity of a single manipulation. For example, when using imaging techniques, an animal can be examined several times during a study, but it has to be anesthetized each time imaging is performed. The severity of anesthesia is thought to be mild according to the Directive 2010/63/EU. However, the Directive does not differentiate between single and repeated anesthesia, although repeated anesthesia may have a greater impact on well-being. Hence, we compared the impact of single and repeated anesthesia (six times at an interval of three to four days) by injection of ketamine and xylazine (KX) on the well-being of adult female and male C57BL/6JRj mice. After anesthesia, well-being of mice was assessed according to a protocol for systematic assessment of well-being including nesting, the Mouse Grimace Scale (MGS), a test for trait anxiety, home cage activity, and the rotarod test for motor activity, food intake, and body weight, as well as corticosterone (metabolite) analysis. Repeated anesthesia increased the MGS in mice of both sexes and caused short-term effects on well-being of female mice in the immediate post-anesthetic period, indicated by longer lasting effects on trait anxiety-related behavior. However, corticosterone metabolite concentrations suggested that mice habituated to the stress induced by repeated KX administration. Hence, the mildly negative effects on well-being of repeated KX anesthesia do not seem to accumulate over time using the respective regimen. However, further observations for severity classification are warranted in order to more specifically determine the duration of mild distress and trait anxiety.
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Affiliation(s)
- Katharina Hohlbaum
- Institute of Animal Welfare, Animal Behavior and Laboratory Animal Science, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
- Institute of Pharmacology and Toxicology, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
- * E-mail:
| | - Bettina Bert
- Institute of Pharmacology and Toxicology, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Silke Dietze
- Institute of Pharmacology and Toxicology, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Rupert Palme
- Unit of Physiology, Pathophysiology and Experimental Endocrinology, Department of Biomedical Sciences, University of Veterinary Medicine, Vienna, Austria
| | - Heidrun Fink
- Institute of Pharmacology and Toxicology, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Christa Thöne-Reineke
- Institute of Animal Welfare, Animal Behavior and Laboratory Animal Science, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
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