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Abstract
In recent years, the gut microbiota has been considered as a full-fledged actor of the gut-brain axis, making it possible to take a new step in understanding the pathophysiology of both neurological and psychiatric diseases. However, most of the studies have been devoted to gut bacterial microbiota, forgetting the non-negligible fungal flora. In this review, we expose how the role of the fungal component in the microbiota-gut-brain axis is legitimate, through its interactions with both the host, especially with the immune system, and the gut bacteria. We also discuss published data that already attest to a role of the mycobiome in the microbiota-gut-brain axis, and the impact of fungi on clinical and therapeutic research.
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102
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Réus GZ, de Moura AB, Silva RH, Resende WR, Quevedo J. Resilience Dysregulation in Major Depressive Disorder: Focus on Glutamatergic Imbalance and Microglial Activation. Curr Neuropharmacol 2018; 16:297-307. [PMID: 28676011 PMCID: PMC5843981 DOI: 10.2174/1570159x15666170630164715] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 06/05/2017] [Accepted: 06/22/2017] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Many studies have been shown an important role of glutamatergic system as well microglial activation in the pathophysiology of major depressive disorder (MDD). In humans most resistant to the development of psychiatric disorders, including MDD, are observed a greater degree of resilience resulting from stress. Less resilience is associated with neuroendocrine and neuroinflammatory markers, as well as with glutamatergic system dysregulation. Thus, this review we highlighted findings from literature identifying the function of glutamatergic system, microglial activation and inflammation in resilience. METHODS We conducted a review of computerized databases from 1970 to 2017. RESULTS There is an association between microglial activation and glutamatergic system activation with stress vulnerability and resilience. CONCLUSIONS Glutamate neurotransmission, including neurotransmitter synthesis, signalling, and glutamate receptor functions and expression all seem to be involved with both stress vulnerability and resilience. Moreover, inflammation and microglial activation mediate individual differences in resilience and the risk of stress-induced MDD.
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Affiliation(s)
- Gislaine Z. Réus
- Laboratory of Neurosciences, Graduate Program in Health Sciences, Health Sciences Unit, University of Southern Santa Catarina (UNESC), Criciúma, SC, Brazil
| | - Airam B. de Moura
- Laboratory of Neurosciences, Graduate Program in Health Sciences, Health Sciences Unit, University of Southern Santa Catarina (UNESC), Criciúma, SC, Brazil
| | - Ritele H. Silva
- Laboratory of Neurosciences, Graduate Program in Health Sciences, Health Sciences Unit, University of Southern Santa Catarina (UNESC), Criciúma, SC, Brazil
| | - Wilson R. Resende
- Laboratory of Neurosciences, Graduate Program in Health Sciences, Health Sciences Unit, University of Southern Santa Catarina (UNESC), Criciúma, SC, Brazil
| | - João Quevedo
- Laboratory of Neurosciences, Graduate Program in Health Sciences, Health Sciences Unit, University of Southern Santa Catarina (UNESC), Criciúma, SC, Brazil
- Translational Psychiatry Program, Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA
- Center of Excellence on Mood Disorders, Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA
- Neuroscience Graduate Program, The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX, USA
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103
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Kong J, Fang J, Park J, Li S, Rong P. Treating Depression with Transcutaneous Auricular Vagus Nerve Stimulation: State of the Art and Future Perspectives. Front Psychiatry 2018; 9:20. [PMID: 29459836 PMCID: PMC5807379 DOI: 10.3389/fpsyt.2018.00020] [Citation(s) in RCA: 113] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 01/18/2018] [Indexed: 12/21/2022] Open
Abstract
Depression is a highly prevalent disorder, and its treatment is far from satisfactory. There is an urgent need to develop a new treatment for depression. Although still at its early stage, transcutaneous auricular vagus nerve stimulation (taVNS) has shown promising potential for treating depression. In this article, we first summarize the results of clinical studies on the treatment effect of taVNS on depression. Then, we re-analyze a previous study to identify the specific symptoms taVNS can relieve as indicated by subscores of the 24-item Hamilton Depression Scale in patients with depression. We found that taVNS can significantly reduce multiple symptoms of depression patients, including anxiety, psychomotor retardation, sleep disturbance, and hopelessness. Next, we pose several hypotheses on the mechanism of taVNS treatment of depression, including directly and indirectly modulating the activity and connectivity of key brain regions involved in depression and mood regulation; inhibiting neuro-inflammatory sensitization; modulating hippocampal neurogenesis; and regulating the microbiome-brain-gut axis. Finally, we outline current challenges and lay out the future directions of taVNS treatment of depression, which include (1) intensively comparing stimulation parameters and "dose effect" (treatment frequency and duration) to maximize the treatment effect of taVNS; (2) exploring the effect of taVNS on disorders comorbid with depression (such as chronic pain disorders, cardiovascular disorder, and autism) to provide new "two-for-one" treatment approaches for patients with these disorders; and (3) applying multiple scale methods to explore the underlying mechanism of taVNS.
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Affiliation(s)
- Jian Kong
- Psychiatry Department, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, United States
| | - Jiliang Fang
- Guang’anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Joel Park
- Psychiatry Department, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, United States
| | - Shaoyuan Li
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
| | - Peijing Rong
- Institute of Acupuncture and Moxibustion, China Academy of Chinese Medical Sciences, Beijing, China
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104
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Basson AR, Lam M, Cominelli F. Complementary and Alternative Medicine Strategies for Therapeutic Gut Microbiota Modulation in Inflammatory Bowel Disease and their Next-Generation Approaches. Gastroenterol Clin North Am 2017; 46:689-729. [PMID: 29173517 PMCID: PMC5909826 DOI: 10.1016/j.gtc.2017.08.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The human gut microbiome exerts a major impact on human health and disease, and therapeutic gut microbiota modulation is now a well-advocated strategy in the management of many diseases, including inflammatory bowel disease (IBD). Scientific and clinical evidence in support of complementary and alternative medicine, in targeting intestinal dysbiosis among patients with IBD, or other disorders, has increased dramatically over the past years. Delivery of "artificial" stool replacements for fecal microbiota transplantation (FMT) could provide an effective, safer alternative to that of human donor stool. Nevertheless, optimum timing of FMT administration in IBD remains unexplored, and future investigations are essential.
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Affiliation(s)
- Abigail R Basson
- Digestive Health Research Institute, Case Western Reserve University, Cleveland, OH, USA; Department of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - Minh Lam
- Digestive Health Research Institute, Case Western Reserve University, Cleveland, OH, USA; Department of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - Fabio Cominelli
- Digestive Health Research Institute, Case Western Reserve University, Cleveland, OH, USA; Department of Medicine, Case Western Reserve University, Cleveland, OH, USA; Department of Pathology, Case Western Reserve University, Cleveland, OH, USA.
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105
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Abautret-Daly Á, Dempsey E, Riestra S, de Francisco-García R, Parra-Blanco A, Rodrigo L, Medina C, Connor TJ, Harkin A. Association between psychological measures with inflammatory anddisease-related markers of inflammatory bowel disease. Int J Psychiatry Clin Pract 2017; 21:221-230. [PMID: 28353360 DOI: 10.1080/13651501.2017.1306081] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE This study aimed at investigating the associations between inflammatory mediators, symptoms and psychological disturbances in inflammatory bowel disease (IBD) patients. METHODS IBD patients and patient controls were examined during a single visit to a gastroenterology clinic. Disease activity was assessed using the Mayo index for ulcerative colitis (UC), inflammatory bowel disease questionnaire (IBDQ), Crohn's disease activity index (CDAI) and Crohn's disease endoscopic index of severity (CDEIS). Gene expression of inflammatory mediators were measured in intestinal biopsies and whole blood samples along with circulating concentrations of interleukin (IL)-6, interferon (IFN)γ, C-reactive protein (CRP), kynurenine and tryptophan. Validated depression, anxiety and quality of life scores were used to assess psychological well-being. RESULTS Patients who were symptomatic had the highest depression and anxiety scores, together with increased intestinal expression of IL-1β, IL-6 and matrix metalloproteinase-9, increased circulating IL-6 and CRP, and an increased circulating kynurenine:tryptophan ratio. Increased Hamilton depression (HAM-D) scores in IBD patients were observed independent of the psychological impact of acute symptoms. CONCLUSIONS Active IBD is associated with symptoms of depression and anxiety and with a raised circulating inflammatory mediator profile. Patients with active IBD exhibiting psychological symptoms should undergo psychological evaluation to ensure the psychological aspects of the condition are considered and addressed.
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Affiliation(s)
- Áine Abautret-Daly
- a Neuropsychopharmacology Research Group, Trinity College Institute of Neuroscience, Trinity College , Dublin 2 , Ireland.,b School of Pharmacy and Pharmaceutical Sciences, Trinity College , Dublin 2 , Ireland
| | - Elaine Dempsey
- a Neuropsychopharmacology Research Group, Trinity College Institute of Neuroscience, Trinity College , Dublin 2 , Ireland.,b School of Pharmacy and Pharmaceutical Sciences, Trinity College , Dublin 2 , Ireland
| | - Sabino Riestra
- c Department of Gastroenterology , Hospital Central de Asturias , Oviedo , Spain
| | | | - Adolfo Parra-Blanco
- c Department of Gastroenterology , Hospital Central de Asturias , Oviedo , Spain
| | - Luis Rodrigo
- c Department of Gastroenterology , Hospital Central de Asturias , Oviedo , Spain
| | - Carlos Medina
- b School of Pharmacy and Pharmaceutical Sciences, Trinity College , Dublin 2 , Ireland.,d Trinity Biomedical Sciences Institute, Trinity College , Dublin 2 , Ireland
| | - Thomas J Connor
- e Neuroimmunology Research Group, School of Medicine and Trinity College Institute of Neuroscience, Trinity College , Dublin 2 , Ireland
| | - Andrew Harkin
- a Neuropsychopharmacology Research Group, Trinity College Institute of Neuroscience, Trinity College , Dublin 2 , Ireland.,b School of Pharmacy and Pharmaceutical Sciences, Trinity College , Dublin 2 , Ireland
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106
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Ma L, Demin KA, Kolesnikova TO, Kharsko SL, Zhu X, Yuan X, Song C, Meshalkina DA, Leonard BE, Tian L, Kalueff AV. Animal inflammation-based models of depression and their application to drug discovery. Expert Opin Drug Discov 2017; 12:995-1009. [DOI: 10.1080/17460441.2017.1362385] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Li Ma
- Neuroscience Center, HiLIFE, University of Helsinki, Helsinki, Finland
| | | | | | | | - Xiaokang Zhu
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China
| | - Xiaodong Yuan
- Department of Neurology, Kailuan General Hospital, North China University of Science and Technology, Tangshan, China
| | - Cai Song
- Institute for Marine Drugs and Nutrition, Guangdong Ocean University, Zhanjiang, China
- Graduate Institute of Biomedical Sciences, College of Medicine, and Department of Medical Research, China Medical University and Hospital, Taichung, Taiwan
| | - Darya A. Meshalkina
- Institute of Translational Biomedicine (ITBM), St. Petersburg State University, St. Petersburg, Russia
| | - Brian E. Leonard
- Department of Pharmacology, National University of Ireland, Galway, Ireland
| | - Li Tian
- Neuroscience Center, HiLIFE, University of Helsinki, Helsinki, Finland
- Psychiatry Research Centre, Beijing Huilongguan Hospital, Peking University, Beijing, China
| | - Allan V. Kalueff
- School of Pharmaceutical Sciences, Southwest University, Chongqing, China
- Institute for Marine Drugs and Nutrition, Guangdong Ocean University, Zhanjiang, China
- Institute of Translational Biomedicine (ITBM), St. Petersburg State University, St. Petersburg, Russia
- Institute of Chemical Technologies, Ural Federal University, Ekaterinburg, Russia
- The International Zebrafish Neuroscience Research Consortium (ZNRC), Slidell, LA, USA
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