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Rokytová I, Mravec B, Lauková M, Vargovič P. Effect of rapamycin on repeated immobilization stress-induced immune alterations in the rat spleen. J Neuroimmunol 2020; 346:577309. [PMID: 32645638 DOI: 10.1016/j.jneuroim.2020.577309] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 06/23/2020] [Accepted: 06/23/2020] [Indexed: 12/26/2022]
Abstract
Chronic stress modulates immune system functions via neuroendocrine pathways. Rapamycin inhibits activity of immune cells through the mTOR signaling pathway. We investigated the effect of rapamycin (15 mg/kg, 3-times/week) on neuroimmune-endocrine system in the spleen of rats exposed to 42 cycles of 2-h immobilization. Rapamycin enhanced the activity of hypothalamic-pituitary-adrenocortical axis induced by stress exposure, prevented stress-induced expression of natural killer cell markers while reversed stress-evoked decline of Th2 immune response markers. Overall, our findings suggest that rapamycin may act on immune functions not only directly by inhibiting of mTOR in immune cells but also indirectly via modulation of neuroendocrine system.
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Affiliation(s)
- Ivana Rokytová
- Institute of Experimental Endocrinology, Biomedical Research Center of the Slovak Academy of Sciences, Bratislava, Slovakia
| | - Boris Mravec
- Institute of Experimental Endocrinology, Biomedical Research Center of the Slovak Academy of Sciences, Bratislava, Slovakia; Institute of Physiology, Faculty of Medicine, Comenius University in Bratislava, Bratislava, Slovakia
| | - Marcela Lauková
- Institute of Experimental Endocrinology, Biomedical Research Center of the Slovak Academy of Sciences, Bratislava, Slovakia; Department of Public Health, Division of Environmental Health Science, School of Health Sciences and Practice, New York Medical College, Valhalla, NY, USA
| | - Peter Vargovič
- Institute of Experimental Endocrinology, Biomedical Research Center of the Slovak Academy of Sciences, Bratislava, Slovakia.
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52
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Spleen contributes to restraint stress induced hepatocellular carcinoma progression. Int Immunopharmacol 2020; 83:106420. [DOI: 10.1016/j.intimp.2020.106420] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/08/2020] [Accepted: 03/16/2020] [Indexed: 12/17/2022]
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53
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Mondelli V, Vernon AC. From early adversities to immune activation in psychiatric disorders: the role of the sympathetic nervous system. Clin Exp Immunol 2020; 197:319-328. [PMID: 31319436 DOI: 10.1111/cei.13351] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/14/2019] [Indexed: 02/07/2023] Open
Abstract
Increased peripheral levels of cytokines and central microglial activation have been reported in patients with psychiatric disorders. The degree of both innate and adaptive immune activation is also associated with worse clinical outcomes and poor treatment response in these patients. Understanding the possible causes and mechanisms leading to this immune activation is therefore an important and necessary step for the development of novel and more effective treatment strategies for these patients. In this work, we review the evidence of literature pointing to childhood trauma as one of the main causes behind the increased immune activation in patients with psychiatric disorders. We then discuss the potential mechanisms linking the experience of early life adversity (ELA) to innate immune activation. Specifically, we focus on the innervation of the bone marrow from sympathetic nervous system (SNS) as a new and emerging mechanism that has the potential to bridge the observed increases in both central and peripheral inflammatory markers in patients exposed to ELA. Experimental studies in laboratory rodents suggest that SNS activation following early life stress exposure causes a shift in the profile of innate immune cells, with an increase in proinflammatory monocytes. In turn, these cells traffic to the brain and influence neural circuitry, which manifests as increased anxiety and other relevant behavioural phenotypes. To date, however, very few studies have been conducted to explore this candidate mechanism in humans. Future research is also needed to clarify whether these pathways could be partially reversible to improve prevention and treatment strategies in the future.
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Affiliation(s)
- V Mondelli
- King's College London, Institute of Psychiatry Psychology and Neuroscience, Department of Psychological Medicine, London, UK.,NIHR Biomedical Research Centre South London and Maudsley NHS Trust, London, UK
| | - A C Vernon
- King's College London, Institute of Psychiatry Psychology and Neuroscience, Department of Basic and Clinical Neuroscience, London, UK.,MRC Centre for Neurodevelopmental Disorders, King's College London, London, UK
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54
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Adams RCM, Smith C. In utero Exposure to Maternal Chronic Inflammation Transfers a Pro-Inflammatory Profile to Generation F2 via Sex-Specific Mechanisms. Front Immunol 2020; 11:48. [PMID: 32117231 PMCID: PMC7031653 DOI: 10.3389/fimmu.2020.00048] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 01/09/2020] [Indexed: 12/29/2022] Open
Abstract
Generational transfer of maladaptations in offspring have been reported to persist for multiple generations in conditions of chronic inflammation, metabolic and psychological stress. Thus, the current study aimed to expand our understanding of the nature, potential sex specificity, and transgenerational plasticity of inflammatory maladaptations resulting from maternal chronic inflammation. Briefly, F1 and F2 generations of offspring from C57/BL/6 dams exposed to a modified maternal periconception systemic inflammation (MSPI) protocol were profiled in terms of leukocyte and splenocyte counts and cytokine responses, as well as glucocorticoid sensitivity. Overall, F1 male and female LPS groups presented with glucocorticoid hypersensitivity (with elevated corticosterone and increased leukocyte glucocorticoid receptor levels) along with a pro-inflammatory phenotype, which carried over to the F2 generation. The transfer of inflammatory and glucocorticoid responsiveness from F1 to F2 is evident, with heritability of this phenotype in F2. The findings suggest that maternal (F0) perinatal chronic inflammation resulted in glucocorticoid dysregulation and a resultant pro-inflammatory phenotype, which is transferred in the maternal lineage but seems to affect male offspring to a greater extent. Of further interest, upregulation of IL-1β cytokine responses is reported in female offspring only. The cumulative maladaptation reported in F2 offspring when both F1 parents were affected by maternal LPS exposure is suggestive of immune senescence. Given the potential impact of current results and the lack of sex-specific investigations, more research in this context is urgently required.
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Affiliation(s)
| | - Carine Smith
- Department of Physiological Sciences, Stellenbosch University, Stellenbosch, South Africa
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55
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McKim DB, Yin W, Wang Y, Cole SW, Godbout JP, Sheridan JF. Social Stress Mobilizes Hematopoietic Stem Cells to Establish Persistent Splenic Myelopoiesis. Cell Rep 2019; 25:2552-2562.e3. [PMID: 30485819 DOI: 10.1016/j.celrep.2018.10.102] [Citation(s) in RCA: 99] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 07/10/2018] [Accepted: 10/26/2018] [Indexed: 01/09/2023] Open
Abstract
Psychosocial stress accelerates myelopoietic production of monocytes and neutrophils that contributes to a variety of health complications ranging from atherosclerosis to anxiety. Here, we show that social stress in mice mobilizes hematopoietic stem progenitor cells (HSPCs) from the bone marrow that enter circulation, engraft into the spleen, and establish a persistent extramedullary hematopoietic depot. These splenic progenitors actively proliferate and differentiate into multiple cell types, including monocytes, neutrophils, and erythrocytes. Splenic erythropoiesis partially abrogates stress-induced anemia. Repeated injection with isoprenaline induces progenitor mobilization to the spleen, identifying a key role for β-adrenergic signaling. Moreover, protracted splenic production of CD11b+ cells persists for at least 24 days after the cessation of social stress. Thus, chronic stress establishes a persistent extramedullary hematopoietic depot that can modify a wide range of chronic disease processes and alter homeostasis of the bi-directional regulatory axis between the nervous and immune systems.
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Affiliation(s)
- Daniel B McKim
- Division of Biosciences, The Ohio State University, Columbus, OH, USA; Department of Neuroscience, The Ohio State University, Columbus, OH, USA; Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA; Department of Animal Sciences, University of Illinois Urbana-Champaign, Urbana, IL, USA
| | - Wenyuan Yin
- Division of Biosciences, The Ohio State University, Columbus, OH, USA; Department of Neuroscience, The Ohio State University, Columbus, OH, USA
| | - Yufen Wang
- Division of Biosciences, The Ohio State University, Columbus, OH, USA
| | - Steve W Cole
- Department of Medicine, University of California, Los Angeles, Los Angeles, CA, USA
| | - Jonathan P Godbout
- Department of Neuroscience, The Ohio State University, Columbus, OH, USA; Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA; Center for Brain and Spinal Cord Repair, The Ohio State University, Columbus, OH, USA
| | - John F Sheridan
- Division of Biosciences, The Ohio State University, Columbus, OH, USA; Department of Neuroscience, The Ohio State University, Columbus, OH, USA; Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA; Center for Brain and Spinal Cord Repair, The Ohio State University, Columbus, OH, USA.
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56
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Splenic artery denervation: target micro-anatomy, feasibility, and early preclinical experience. Transl Res 2019; 213:100-111. [PMID: 31415732 DOI: 10.1016/j.trsl.2019.07.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 07/09/2019] [Accepted: 07/22/2019] [Indexed: 01/28/2023]
Abstract
This study sought to evaluate perisplenic artery nerve distribution and the feasibility of splenic artery denervation (SDN). The NEXION radiofrequency catheter was used to perform SDN in healthy and inflammatory arthritis pigs. Splenic artery anatomy, nerve distribution, and splenic norepinephrine (NEPI) levels were evaluated before and after SDN. Perisplenic artery nerves were primarily distributed within 2.5 mm of the arterial lumen and were largely sympathetic on the basis of tyrosine hydroxylase expression. The pancreas, tended to be circumferentially positioned around the proximal splenic artery, typically >2.5 mm from the lumen, ensuring that most of the nerves could be targeted without affecting this sensitive organ. The mid segment of the splenic artery was relatively free of contact with the adjacent pancreas. Splenic NEPI levels and nerve abundance followed a decreasing gradient from the proximal to distal splenic artery. SDN resulted in significant reductions in splenic NEPI levels at day 14 (60.7%, P = 0.024) in naïve pigs and day 45 (100%, P = 0.001) in inflammatory arthritis pigs. There was no significant effect of SDN on joint soft tissue injury or circulating inflammatory markers in the inflammatory arthritis model. The majority of perisplenic arterial nerves are within close proximity of the lumen and are primarily sympathetic efferent fibers. Nerves in the mid-segment may be the preferred SDN target given their proximity to the artery and paucity of periarterial off-target organs. SDN appears safe and effective at reducing splenic NEPI levels.
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57
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Mesenchymal Stromal Cells Modulate Peripheral Stress-Induced Innate Immune Activation Indirectly Limiting the Emergence of Neuroinflammation-Driven Depressive and Anxiety-like Behaviors. Biol Psychiatry 2019; 86:712-724. [PMID: 31521333 DOI: 10.1016/j.biopsych.2019.07.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 07/05/2019] [Accepted: 07/15/2019] [Indexed: 02/08/2023]
Abstract
BACKGROUND Hyperactivation of innate immunity has been implicated in the etiology of mood disorders, including major depressive disorder (MDD). Mesenchymal stromal cells (MSCs) have demonstrated potent immunomodulatory capabilities in the context of chronic inflammatory disease and injury but have yet to be evaluated in stress-based preclinical models of MDD. We sought to test the ability of intravenous MSCs to modulate innate immune activation and behavioral patterns associated with repeated social defeat (RSD). METHODS Murine RSD-induced innate immune activation as well as depressive and anxiety-like behaviors were assessed in unstressed, RSD, and RSD + human MSC groups. Biodistribution and fate studies were performed to inform potential mechanisms of action. RESULTS MSCs reduced stress-induced circulating proinflammatory cytokines, monocytes, neuroinflammation, and depressive and anxiety-like behaviors. Biodistribution analyses indicated that infused MSCs distributed within peripheral organs without homing to the brain. Murine neutrophils targeted MSCs in the lungs within hours of administration. MSCs and recipient neutrophils were cleared by recipient macrophages promoting a switch toward a regulatory phenotype and systemic resolution of inflammation. CONCLUSIONS Peripheral delivery of MSCs modulates central nervous system inflammatory processes and aberrant behavioral patterns in a stress-based rodent model of MDD and anxiety. Recent studies suggest that host immune cell-mediated phagocytosis of MSCs in vivo can trigger an immunomodulatory cascade, resulting in resolution of inflammation. Our data suggest that similar mechanisms may protect distal organs, including the brain, from systemic, stress-induced proinflammatory spikes and may uncover unexpected targets in the periphery for novel or adjunct treatment for a subset of patients with MDD.
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58
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McMurray KMJ, Vollmer LL, Ahlbrand R, Thomas J, Winter A, Lewkowich IP, Sah R. Immunomodulatory T cell death associated gene-8 (TDAG8) receptor in depression-associated behaviors. Physiol Behav 2019; 209:112598. [PMID: 31271833 DOI: 10.1016/j.physbeh.2019.112598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 06/26/2019] [Accepted: 06/29/2019] [Indexed: 12/27/2022]
Abstract
Converging evidence supports neuroimmune factors in depression psychopathology. We previously reported reduced depression-like behavior in immunomodulatory G-protein-coupled receptor, T cell death-associated gene-8 (TDAG8) deficient mice. Here, we expand on those findings by investigating depression- and anxiety-associated behaviors, and cytokine profiles in TDAG8-deficient mice. TDAG8-deficiency reduced depression- and anxiety-associated behaviors in the forced swim test (FST), open-field test and elevated zero maze. Interestingly, cytokine expression, particularly IL-6, was attenuated within hippocampus and spleen in TDAG8-deficient mice following the FST. There were no differences in immune-cell frequencies. Collectively, these data suggest a contributory role of TDAG8 in neuroimmune regulation and depression-associated physiology.
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Affiliation(s)
- Katherine M J McMurray
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA.
| | - Lauren Larke Vollmer
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Rebecca Ahlbrand
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Joshua Thomas
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Andrew Winter
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA; Neuroscience Graduate Program, University of Cincinnati, Medical Sciences Building, Room 1058B, 231 Albert Sabin Way, Cincinnati, OH 45237, USA
| | - Ian P Lewkowich
- Division of Immunobiology, Children's Hospital Medical Center, Cincinnati, OH 45229, USA; Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45229, USA
| | - Renu Sah
- Department of Pharmacology and Systems Physiology, University of Cincinnati College of Medicine, Cincinnati, OH, USA; Neuroscience Graduate Program, University of Cincinnati, Medical Sciences Building, Room 1058B, 231 Albert Sabin Way, Cincinnati, OH 45237, USA; VA Medical Center, Cincinnati, OH 45237, USA
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59
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Kim GS, Smith AK, Xue F, Michopoulos V, Lori A, Armstrong DL, Aiello AE, Koenen KC, Galea S, Wildman DE, Uddin M. Methylomic profiles reveal sex-specific differences in leukocyte composition associated with post-traumatic stress disorder. Brain Behav Immun 2019; 81:280-291. [PMID: 31228611 PMCID: PMC6754791 DOI: 10.1016/j.bbi.2019.06.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 06/18/2019] [Accepted: 06/18/2019] [Indexed: 02/07/2023] Open
Abstract
Post-traumatic stress disorder (PTSD) is a debilitating mental disorder precipitated by trauma exposure. However, only some persons exposed to trauma develop PTSD. There are sex differences in risk; twice as many women as men develop a lifetime diagnosis of PTSD. Methylomic profiles derived from peripheral blood are well-suited for investigating PTSD because DNA methylation (DNAm) encodes individual response to trauma and may play a key role in the immune dysregulation characteristic of PTSD pathophysiology. In the current study, we leveraged recent methodological advances to investigate sex-specific differences in DNAm-based leukocyte composition that are associated with lifetime PTSD. We estimated leukocyte composition on a combined methylation array dataset (483 participants, ∼450 k CpG sites) consisting of two civilian cohorts, the Detroit Neighborhood Health Study and Grady Trauma Project. Sex-stratified Mann-Whitney U test and two-way ANCOVA revealed that lifetime PTSD was associated with significantly higher monocyte proportions in males, but not in females (Holm-adjusted p-val < 0.05). No difference in monocyte proportions was observed between current and remitted PTSD cases in males, suggesting that this sex-specific difference may reflect a long-standing trait of lifetime history of PTSD, rather than current state of PTSD. Associations with lifetime PTSD or PTSD status were not observed in any other leukocyte subtype and our finding in monocytes was confirmed using cell estimates based on a different deconvolution algorithm, suggesting that our sex-specific findings are robust across cell estimation approaches. Overall, our main finding of elevated monocyte proportions in males, but not in females with lifetime history of PTSD provides evidence for a sex-specific difference in peripheral blood leukocyte composition that is detectable in methylomic profiles and that may reflect long-standing changes associated with PTSD diagnosis.
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Affiliation(s)
- Grace S Kim
- Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Medical Scholars Program, University of Illinois College of Medicine, Urbana, IL, USA
| | - Alicia K Smith
- Department of Psychiatry & Behavioral Sciences, Emory University, Atlanta, GA, USA; Department of Gynecology and Obstetrics, Emory University, Atlanta, GA, USA
| | - Fei Xue
- Department of Statistics, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Vasiliki Michopoulos
- Department of Psychiatry & Behavioral Sciences, Emory University, Atlanta, GA, USA
| | - Adriana Lori
- Department of Psychiatry & Behavioral Sciences, Emory University, Atlanta, GA, USA
| | - Don L Armstrong
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Allison E Aiello
- Gillings School of Global Public Health, University of North Carolina - Chapel Hill, Chapel Hill, NC, USA
| | - Karestan C Koenen
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Sandro Galea
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
| | - Derek E Wildman
- Genomics Program, College of Public Health, University of South Florida, Tampa, FL, USA
| | - Monica Uddin
- Genomics Program, College of Public Health, University of South Florida, Tampa, FL, USA.
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60
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van de Wouw M, Boehme M, Dinan TG, Cryan JF. Monocyte mobilisation, microbiota & mental illness. Brain Behav Immun 2019; 81:74-91. [PMID: 31330299 DOI: 10.1016/j.bbi.2019.07.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 07/12/2019] [Accepted: 07/18/2019] [Indexed: 12/13/2022] Open
Abstract
The gastrointestinal microbiome has emerged as a key player in regulating brain and behaviour. This has led to the strategy of targeting the gut microbiota to ameliorate disorders of the central nervous system. Understanding the underlying signalling pathways in which the microbiota impacts these disorders is crucial for the development of future therapeutics for improving CNS functionality. One of the major pathways through which the microbiota influences the brain is the immune system, where there is an increasing appreciation for the role of monocyte trafficking in regulating brain homeostasis. In this review, we will shed light on the role of monocyte trafficking as a relay of microbiota signals in conditions where the central nervous system is in disorder, such as stress, peripheral inflammation, ageing, traumatic brain injury, stroke, multiple sclerosis, Alzheimer's disease and Parkinson's disease. We also cover how the gastrointestinal microbiota is implicated in these mental illnesses. In addition, we aim to discuss how the monocyte system can be modulated by the gut microbiota to mitigate disorders of the central nervous system, which will lead to novel microbiota-targeted strategies.
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Affiliation(s)
| | - Marcus Boehme
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | - Timothy G Dinan
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Psychiatry and Neurobehavioral Science, University College Cork, Cork, Ireland
| | - John F Cryan
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland.
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61
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Esquivel-Rendón E, Vargas-Mireles J, Cuevas-Olguín R, Miranda-Morales M, Acosta-Mares P, García-Oscos F, Pineda JC, Salgado H, Rose-John S, Atzori M. Interleukin 6 Dependent Synaptic Plasticity in a Social Defeat-Susceptible Prefrontal Cortex Circuit. Neuroscience 2019; 414:280-296. [DOI: 10.1016/j.neuroscience.2019.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 06/08/2019] [Accepted: 07/01/2019] [Indexed: 12/29/2022]
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Chronic restraint stress promotes hepatocellular carcinoma growth by mobilizing splenic myeloid cells through activating β-adrenergic signaling. Brain Behav Immun 2019; 80:825-838. [PMID: 31125710 DOI: 10.1016/j.bbi.2019.05.031] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 05/20/2019] [Accepted: 05/20/2019] [Indexed: 02/08/2023] Open
Abstract
Psychological stress promotes tumor progression and has a large impact on the immune system, particularly the spleen. The spleen plays an important role in tumor behavior. However, the role and mechanism of the spleen in hepatocellular carcinoma progression induced by stress is unclear. Here, we showed that the spleen plays a critical role in hepatocellular carcinoma growth induced by restraint stress. Our results demonstrated that restraint stress promoted hepatocellular carcinoma growth, changed the spleen structure, and redistributed splenic myeloid cells to tumor tissues. Interestingly, we found that splenectomy could inhibit hepatocellular carcinoma growth and prevent increases in myeloid cells and macrophages in tumor tissues in stressed mice. Restraint stress significantly elevated the concentration of norepinephrine in the spleen, serum and tumor tissues. Meanwhile, propranolol, an inhibitor of β-adrenergic signaling, could inhibit hepatocellular carcinoma growth and prevent the redistribution of splenic myeloid cells induced by restraint stress, suggesting that restraint stress promotes hepatocellular carcinoma growth and redistributes splenic myeloid cells through β-adrenergic signaling. Mechanistic studies revealed that restraint stress upregulated the expressions of CXCL2/CXCL3 in tumor tissues and changed the expression of CXCR2 in myeloid cells. SB225002, an inhibitor of CXCR2, could prevent the recruitment of myeloid cells in tumor tissues and inhibit tumor growth in stressed mice. Together, these data indicate that chronic restraint stress promotes hepatocellular carcinoma growth by mobilizing splenic myeloid cells to tumor tissues via activating β-adrenergic signaling. The CXCR2-CXCL2/CXCL3 axis contributed to the recruitment of myeloid cells in tumor tissues induced by restraint stress.
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63
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Hinwood M, Kluge MG, Ilicic M, Walker FR. Understanding microglial involvement in stress-induced mood disturbance: a modulator of vulnerability? Curr Opin Behav Sci 2019. [DOI: 10.1016/j.cobeha.2019.01.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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64
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Nelson LH, Saulsbery AI, Lenz KM. Small cells with big implications: Microglia and sex differences in brain development, plasticity and behavioral health. Prog Neurobiol 2019; 176:103-119. [PMID: 30193820 PMCID: PMC8008579 DOI: 10.1016/j.pneurobio.2018.09.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 07/17/2018] [Accepted: 09/01/2018] [Indexed: 12/20/2022]
Abstract
Brain sex differences are programmed largely by sex hormone secretions and direct sex chromosome effects in early life, and are subsequently modulated by early life experiences. The brain's resident immune cells, called microglia, actively contribute to brain development. Recent research has shown that microglia are sexually dimorphic, especially during early life, and may participate in sex-specific organization of the brain and behavior. Likewise, sex differences in immune cells and their signaling in the adult brain have been found, although in most cases their function remains unclear. Additionally, immune cells and their signaling have been implicated in many disorders in which brain development or plasticity is altered, including autism, schizophrenia, pain disorders, major depression, and postpartum depression. This review summarizes what is currently known about sex differences in neuroimmune function in development and during other major phases of brain plasticity, as well as the current state of knowledge regarding sex-specific neuroimmune function in psychiatric disorders.
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Affiliation(s)
- Lars H Nelson
- Department of Psychology, The Ohio State University, Columbus, OH 43210, USA; Neuroscience Graduate Program, The Ohio State University, Columbus, OH 43210, USA
| | - Angela I Saulsbery
- Department of Psychology, The Ohio State University, Columbus, OH 43210, USA
| | - Kathryn M Lenz
- Department of Psychology, The Ohio State University, Columbus, OH 43210, USA; Department of Neuroscience, The Ohio State University, Columbus, OH 43210, USA; Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH 43210, USA.
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65
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Repeated social defeat in female mice induces anxiety-like behavior associated with enhanced myelopoiesis and increased monocyte accumulation in the brain. Brain Behav Immun 2019; 78:131-142. [PMID: 30684650 PMCID: PMC6488440 DOI: 10.1016/j.bbi.2019.01.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 01/14/2019] [Accepted: 01/19/2019] [Indexed: 12/30/2022] Open
Abstract
Anxiety and mood disorders affect both men and women. The majority of experimental models of stress, however, are completed using only male animals. For repeated social defeat (RSD), a rodent model, this is due to the inherent difficulty in eliciting male aggression toward female mice. To address this limitation, a recent study showed that a DREADD-based activation of the ventrolateral subdivision of the ventromedial hypothalamus (VMHvl) was effective in inducing aggressive behavior in male mice towards females in a social defeat paradigm. Therefore, the goal of this study was to determine if this modified version of RSD in females elicited behavioral, physiological, and immune responses similar to those reported in males. Here, we show that female mice subjected to RSD with the male DREADD aggressor developed anxiety-like behavior and social avoidance. These behavioral alterations coincided with enhanced neuronal and microglial activation in threat-appraisal regions of the brain. Moreover, stressed female mice had an enhanced peripheral immune response characterized by increased myelopoiesis, release of myeloid cells into circulation, and monocyte accumulation in the spleen and brain. These results are consistent with previously reported findings that male mice exposed to RSD exhibited increased fear and threat appraisal responses, enhanced myelopoiesis, myeloid cell release and trafficking, and anxiety-like behavior. These findings validate that RSD is a relevant model to study stress responses in female mice.
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66
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Weber MD, McKim DB, Niraula A, Witcher KG, Yin W, Sobol CG, Wang Y, Sawicki CM, Sheridan JF, Godbout JP. The Influence of Microglial Elimination and Repopulation on Stress Sensitization Induced by Repeated Social Defeat. Biol Psychiatry 2019; 85:667-678. [PMID: 30527629 PMCID: PMC6440809 DOI: 10.1016/j.biopsych.2018.10.009] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 10/10/2018] [Accepted: 10/11/2018] [Indexed: 01/19/2023]
Abstract
BACKGROUND Stress is associated with an increased prevalence of anxiety and depression. Repeated social defeat (RSD) stress in mice increases the release of monocytes from the bone marrow that are recruited to the brain by microglia. These monocytes enhance inflammatory signaling and augment anxiety. Moreover, RSD promotes stress sensitization, in which exposure to acute stress 24 days after cessation of RSD causes anxiety recurrence. The purpose of this study was to determine whether microglia were critical to stress sensitization and exhibited increased reactivity to subsequent acute stress or immune challenge. METHODS Mice were exposed to RSD, microglia were eliminated by colony-stimulating factor 1 receptor antagonism (PLX5622) and allowed to repopulate, and responses to acute stress or immune challenge (lipopolysaccharide) were determined 24 days after RSD sensitization. RESULTS Microglia maintained a unique messenger RNA signature 24 days after RSD. Moreover, elimination of RSD-sensitized microglia prevented monocyte accumulation in the brain and blocked anxiety recurrence following acute stress (24 days). When microglia were eliminated prior to RSD and repopulated and mice were subjected to acute stress, there was monocyte accumulation in the brain and anxiety in RSD-sensitized mice. These responses were unaffected by microglial elimination/repopulation. This may be related to neuronal sensitization that persisted 24 days after RSD. Following immune challenge, there was robust microglial reactivity in RSD-sensitized mice associated with prolonged sickness behavior. Here, microglial elimination/repopulation prevented the amplified immune reactivity ex vivo and in vivo in RSD-sensitized mice. CONCLUSIONS Microglia and neurons remain sensitized weeks after RSD, and only the immune reactivity component of RSD-sensitized microglia was prevented by elimination/repopulation.
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Affiliation(s)
- Michael D Weber
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, Ohio; Division of Biosciences, The Ohio State University College of Dentistry, Columbus, Ohio
| | - Daniel B McKim
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, Ohio; Division of Biosciences, The Ohio State University College of Dentistry, Columbus, Ohio
| | - Anzela Niraula
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, Ohio; Division of Biosciences, The Ohio State University College of Dentistry, Columbus, Ohio
| | - Kristina G Witcher
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, Ohio
| | - Wenyuan Yin
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, Ohio; Division of Biosciences, The Ohio State University College of Dentistry, Columbus, Ohio
| | - Carly G Sobol
- Division of Biosciences, The Ohio State University College of Dentistry, Columbus, Ohio
| | - Yufen Wang
- Division of Biosciences, The Ohio State University College of Dentistry, Columbus, Ohio
| | - Caroline M Sawicki
- Division of Biosciences, The Ohio State University College of Dentistry, Columbus, Ohio
| | - John F Sheridan
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, Ohio; Institute for Behavioral Medicine Research, The Ohio State University Wexner Medical Center, Columbus, Ohio; Division of Biosciences, The Ohio State University College of Dentistry, Columbus, Ohio.
| | - Jonathan P Godbout
- Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, Ohio; Institute for Behavioral Medicine Research, The Ohio State University Wexner Medical Center, Columbus, Ohio.
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67
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Modelling posttraumatic stress disorders in animals. Prog Neuropsychopharmacol Biol Psychiatry 2019; 90:117-133. [PMID: 30468906 DOI: 10.1016/j.pnpbp.2018.11.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 11/19/2018] [Accepted: 11/19/2018] [Indexed: 01/07/2023]
Abstract
Animal models of posttraumatic stress disorder are useful tools to reveal the neurobiological basis of the vulnerability to traumatic events, and to develop new treatment strategies, as well as predicting treatment response contributing to personalized medicine approach. Different models have different construct, face and predictive validity and they model different symptoms of the disease. The most prevalent models are the single prolonged stress, electric foot-shock and predator odor. Freezing as 're-experiencing' in cluster B and startle as 'arousal' in cluster E according to DSM-5 are the most frequently studied parameters; however, several other symptoms related to mood, cognitive and social skills are part of the examinations. Beside behavioral characteristics, symptoms of exaggerated sympathetic activity and hypothalamic-pituitary-adrenocortical axis as well as signs of sleep disturbances are also warranted. Test battery rather than a single test is required to describe a model properly and the results should be interpreted in a comprehensive way, e.g. creating a z-score. Research is shifting to study larger populations and identifying the features of the resilient and vulnerable individuals, which cannot be easily done in humans. Incorporation of the "three hit theory" in animal models may lead to a better animal model of vulnerability and resilience. As women are twice as vulnerable as men, more emphasize should be taken to include female animals. Moreover, hypothesis free testing and big data analysis may help to identify an array of biomarkers instead of a single variable for identification of vulnerability and for the purpose of personalized medicine.
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68
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Bekhbat M, Howell PA, Rowson SA, Kelly SD, Tansey MG, Neigh GN. Chronic adolescent stress sex-specifically alters central and peripheral neuro-immune reactivity in rats. Brain Behav Immun 2019; 76:248-257. [PMID: 30550932 PMCID: PMC6886374 DOI: 10.1016/j.bbi.2018.12.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 11/09/2018] [Accepted: 12/10/2018] [Indexed: 12/19/2022] Open
Abstract
Adversity during development is a reliable predictor of psychiatric disorders such as depression and anxiety which are increasingly recognized to have an immune component. We have previously demonstrated that chronic adolescent stress (CAS) in rats leads to depressive-like behavior in adulthood along with long-lasting changes to the hypothalamic-pituitary-adrenal axis and pro-inflammatory cytokine induction in the hippocampus. However, the mechanisms by which CAS promotes hippocampal inflammation are not yet defined. Here we tested the hypothesis that a history of CAS exaggerates induction of the pro-inflammatory NFκB pathway in the adult rat hippocampus without compromising the peripheral immune response. We also assessed potential sex differences because it is unclear whether females, who are twice as likely to suffer from mood disorders as males, are disproportionally affected by stress-primed inflammation. Male and female adolescent rats underwent a CAS paradigm or received no stress. Six weeks following the last stressor, all rats received a single systemic injection of either lipopolysaccharide or vehicle to unmask possible immune-priming effects of CAS. An NFκB signaling PCR array demonstrated that CAS exaggerated the expression of NFκB-related genes in the hippocampus of both males and females. Interestingly, targeted qPCR demonstrated that CAS potentiated the induction of hippocampal IL1B and REL mRNA in female rats only, suggesting that some immune effects of CAS are indeed sex-specific. In contrast to the hippocampal findings, indices of peripheral inflammation such as NFκB activity in the spleen, plasma IL-1β, IL-6, TNF-α, and corticosterone were not impacted by CAS in female rats. Despite showing no pro-inflammatory changes to hippocampal mRNA, male CAS rats displayed lower plasma corticosterone response to LPS at 2 h after injection followed by an exaggerated plasma IL-1β response at 4 h. This potentially blunted corticosterone response coupled with excessive innate immune signaling in the periphery is consistent with possible glucocorticoid resistance in males. In contrast, the effects of CAS manifested as excessive hippocampal immune reactivity in females. We conclude that while a history of exposure to chronic adolescent stress enhances adult immune reactivity in both males and females, the mechanism and manifestation of such alterations are sex-specific.
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Affiliation(s)
- Mandakh Bekhbat
- Emory University Graduate Division of Biological Sciences Neuroscience Graduate Program
| | - Paul A. Howell
- Virginia Commonwealth University, Department of Anatomy & Neurobiology
| | - Sydney A. Rowson
- Emory University Graduate Division of Biological Sciences Molecular and Systems Pharmacology Graduate Studies Program
| | | | | | - Gretchen N. Neigh
- Virginia Commonwealth University, Department of Anatomy & Neurobiology,Corresponding Author: Gretchen N. Neigh, PhD, Virginia Commonwealth University, 1101 East Marshall Street, PO Box 980709, Richmond, VA 23298, V: 804-628-5152, F: 804-828-9477,
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69
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Hassell JE, Nguyen KT, Gates CA, Lowry CA. The Impact of Stressor Exposure and Glucocorticoids on Anxiety and Fear. Curr Top Behav Neurosci 2019; 43:271-321. [PMID: 30357573 DOI: 10.1007/7854_2018_63] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Anxiety disorders and trauma- and stressor-related disorders, such as posttraumatic stress disorder (PTSD), are common and are associated with significant economic and social burdens. Although trauma and stressor exposure are recognized as a risk factors for development of anxiety disorders and trauma or stressor exposure is recognized as essential for diagnosis of PTSD, the mechanisms through which trauma and stressor exposure lead to these disorders are not well characterized. An improved understanding of the mechanisms through which trauma or stressor exposure leads to development and persistence of anxiety disorders or PTSD may result in novel therapeutic approaches for the treatment of these disorders. Here, we review the current state-of-the-art theories, with respect to mechanisms through which stressor exposure leads to acute or chronic exaggeration of avoidance or anxiety-like defensive behavioral responses and fear, endophenotypes in both anxiety disorders and trauma- and stressor-related psychiatric disorders. In this chapter, we will explore physiological responses and neural circuits involved in the development of acute and chronic exaggeration of anxiety-like defensive behavioral responses and fear states, focusing on the role of the hypothalamic-pituitary-adrenal (HPA) axis and glucocorticoid hormones.
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Affiliation(s)
- J E Hassell
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
- Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA
| | - K T Nguyen
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
| | - C A Gates
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA
| | - C A Lowry
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, CO, USA.
- Center for Neuroscience, University of Colorado Boulder, Boulder, CO, USA.
- Department of Physical Medicine and Rehabilitation, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
- Center for Neuroscience, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
- Veterans Health Administration, Rocky Mountain Mental Illness Research Education and Clinical Center, Denver Veterans Affairs Medical Center (VAMC), Denver, CO, USA.
- Military and Veteran Microbiome Consortium for Research and Education (MVM-CoRE), Denver, CO, USA.
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Abstract
PURPOSE OF REVIEW Traumatic brain injury (TBI) and post-traumatic stress disorder (PTSD) can result from similar injuries and can result in similar symptoms, such as problems with sleep, concentration, memory, and mood. Although PTSD and persistent sequelae due to a TBI (PST) have generally been viewed as pragmatically confounded but conceptually separable entities, we examine emerging evidence emphasizing the breadth of overlap in both clinical presentation and underlying pathophysiology between PST and PTSD. RECENT FINDINGS New evidence underscores the poor specificity of symptoms to etiology and emphasizes the potential, after both physical brain injury and traumatic stress, for changes in each of the three interacting systems that coordinate the body's response to the experience or expectation of major injury-the immune, endocrine, and neuromodulatory neurotransmitter systems. A view of PTSD and PST sharing common pathophysiologic elements related to the CNS response to acute injury or threat carries important implications for research and clinical care.
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71
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Fonken LK, Frank MG, Gaudet AD, Maier SF. Stress and aging act through common mechanisms to elicit neuroinflammatory priming. Brain Behav Immun 2018; 73:133-148. [PMID: 30009999 PMCID: PMC6129421 DOI: 10.1016/j.bbi.2018.07.012] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 07/09/2018] [Accepted: 07/12/2018] [Indexed: 01/05/2023] Open
Abstract
Over the course of an animal's lifespan, there is a protracted breakdown in basic homeostatic functions. Stressors (both psychological and physiological) can accelerate this process and compromise multiple homeostatic mechanisms. For example, both stress and aging can modulate neuroinflammatory function and cause a primed phenotype resulting in a heightened neuroinflammatory profile upon immune activation. Microglia, the brain's resident myeloid cell, produce "silent" immune machinery in response to stress and aging that does not cause immediate immune activation; rather, these changes prime the cell for a subsequent immune insult. Primed microglia exhibit a hyperinflammatory response upon immune activation that can exacerbate pathology. In this review, we will explore parallels between stress- and aging-induced neuroinflammatory priming. First, we will provide a background on the basic principles of neuroimmunology. Next, we will discuss evidence that neuroinflammatory responses become primed in the context of both stress and aging. We will also describe cell-specific contributions to neuroinflammatory priming with a focus on microglia. Finally, common mechanisms underlying priming in the context of stress and aging will be discussed: these mechanisms include glucocorticoid signaling; accumulation of danger signals; dis-inhibition of microglia; and breakdown of circadian rhythms. Overall, there are multifarious parallels between stress- and aging-elicited neuroinflammatory priming, suggesting that stress may promote a form of premature aging. Further unravelling mechanisms underlying priming could lead to improved treatments for buffering against stress- and aging-elicited behavioral pathologies.
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Affiliation(s)
- Laura K. Fonken
- University of Texas at Austin, Division of Pharmacology and Toxicology, Austin, TX 78712 USA;,To whom correspondence should be addressed: Laura K. Fonken, Division of Pharmacology and Toxicology, University of Texas at Austin, 107 W. Dean Keeton, BME 3.510C, Austin, TX 78712 USA.
| | - Matthew G. Frank
- University of Colorado Boulder, Department of Psychology and Neuroscience, Boulder, CO 80309 USA
| | - Andrew D. Gaudet
- University of Colorado Boulder, Department of Psychology and Neuroscience, Boulder, CO 80309 USA
| | - Steven F. Maier
- University of Colorado Boulder, Department of Psychology and Neuroscience, Boulder, CO 80309 USA
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72
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Garré JM, Yang G. Contributions of monocytes to nervous system disorders. J Mol Med (Berl) 2018; 96:873-883. [PMID: 30030568 PMCID: PMC6186399 DOI: 10.1007/s00109-018-1672-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 06/26/2018] [Accepted: 07/10/2018] [Indexed: 12/16/2022]
Abstract
Monocytes are a class of leukocytes derived from progenitors in the bone marrow and are prevalent in the blood stream. Although the main function of monocytes is to provide innate immune defenses against infection and injury, their contributions to the central nervous system (CNS) disorders are increasingly recognized. In this review article, we summarize the molecular and physiological properties of monocytes in relation to other myeloid cells. Primarily, we discuss how monocytes (or leukocytes) may affect neuronal function in diseases that are characterized by dysregulated innate immunity and cognitive dysfunction. Under these pathological conditions, monocytes and monocyte-derived cells (1) fail to remove neurotoxic products from CNS, (2) interact with astrocytes at the periphery-brain interfaces to alter synapse development and plasticity, or (3) infiltrate into the CNS to exacerbate neuroinflammation. Through these cellular mechanisms, we speculate that monocytes and other peripheral immune cells may affect brain functioning and contribute to behavioral and cognitive deficits. Better understanding of neuroimmune interactions will help the development of strategies to ameliorate neuronal and cognitive dysfunction associated with dysregulated innate immunity.
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Affiliation(s)
- Juan Mauricio Garré
- Department of Anesthesiology, Columbia University, New York, NY, 10032, USA.
| | - Guang Yang
- Department of Anesthesiology, Columbia University, New York, NY, 10032, USA.
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73
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van de Wouw M, Boehme M, Lyte JM, Wiley N, Strain C, O'Sullivan O, Clarke G, Stanton C, Dinan TG, Cryan JF. Short-chain fatty acids: microbial metabolites that alleviate stress-induced brain-gut axis alterations. J Physiol 2018; 596:4923-4944. [PMID: 30066368 DOI: 10.1113/jp276431] [Citation(s) in RCA: 418] [Impact Index Per Article: 69.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Accepted: 06/22/2018] [Indexed: 02/06/2023] Open
Abstract
KEY POINTS Chronic (psychosocial) stress changes gut microbiota composition, as well as inducing behavioural and physiological deficits. The microbial metabolites short-chain fatty acids (SCFAs) have been implicated in gastrointestinal functional, (neuro)immune regulation and host metabolism, but their role in stress-induced behavioural and physiological alterations is poorly understood. Administration of SCFAs to mice undergoing psychosocial stress alleviates enduring alterations in anhedonia and heightened stress-responsiveness, as well as stress-induced increases in intestinal permeability. In contrast, chronic stress-induced alterations in body weight gain, faecal SCFAs and the gene expression of the SCFA receptors FFAR2 and FFAR3 remained unaffected by SCFA supplementation. These results present novel insights into mechanisms underpinning the influence of the gut microbiota on brain homeostasis, behaviour and host metabolism, informing the development of microbiota-targeted therapies for stress-related disorders. ABSTRACT There is a growing recognition of the involvement of the gastrointestinal microbiota in the regulation of physiology and behaviour. Microbiota-derived metabolites play a central role in the communication between microbes and their host, with short-chain fatty acids (SCFAs) being perhaps the most studied. SCFAs are primarily derived from fermentation of dietary fibres and play a pivotal role in host gut, metabolic and immune function. All these factors have previously been demonstrated to be adversely affected by stress. Therefore, we sought to assess whether SCFA supplementation could counteract the enduring effects of chronic psychosocial stress. C57BL/6J male mice received oral supplementation of a mixture of the three principle SCFAs (acetate, propionate and butyrate). One week later, mice underwent 3 weeks of repeated psychosocial stress, followed by a comprehensive behavioural analysis. Finally, plasma corticosterone, faecal SCFAs and caecal microbiota composition were assessed. SCFA treatment alleviated psychosocial stress-induced alterations in reward-seeking behaviour, and increased responsiveness to an acute stressor and in vivo intestinal permeability. In addition, SCFAs exhibited behavioural test-specific antidepressant and anxiolytic effects, which were not present when mice had also undergone psychosocial stress. Stress-induced increases in body weight gain, faecal SCFAs and the colonic gene expression of the SCFA receptors free fatty acid receptors 2 and 3 remained unaffected by SCFA supplementation. Moreover, there were no collateral effects on caecal microbiota composition. Taken together, these data show that SCFA supplementation alleviates selective and enduring alterations induced by repeated psychosocial stress and these data may inform future research into microbiota-targeted therapies for stress-related disorders.
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Affiliation(s)
- Marcel van de Wouw
- Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland.,APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - Marcus Boehme
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - Joshua M Lyte
- APC Microbiome Ireland, University College Cork, Cork, Ireland
| | - Niamh Wiley
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - Conall Strain
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - Orla O'Sullivan
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - Gerard Clarke
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Department of Psychiatry and Neurobehavioral Science, University College Cork, Cork, Ireland
| | - Catherine Stanton
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - Timothy G Dinan
- APC Microbiome Ireland, University College Cork, Cork, Ireland.,Department of Psychiatry and Neurobehavioral Science, University College Cork, Cork, Ireland
| | - John F Cryan
- Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland.,APC Microbiome Ireland, University College Cork, Cork, Ireland.,Department of Psychiatry and Neurobehavioral Science, University College Cork, Cork, Ireland
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The Innate Immune Receptors TLR2/4 Mediate Repeated Social Defeat Stress-Induced Social Avoidance through Prefrontal Microglial Activation. Neuron 2018; 99:464-479.e7. [DOI: 10.1016/j.neuron.2018.06.035] [Citation(s) in RCA: 137] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 05/29/2018] [Accepted: 06/21/2018] [Indexed: 12/17/2022]
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75
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Microglial recruitment of IL-1β-producing monocytes to brain endothelium causes stress-induced anxiety. Mol Psychiatry 2018; 23:1421-1431. [PMID: 28373688 PMCID: PMC5628107 DOI: 10.1038/mp.2017.64] [Citation(s) in RCA: 245] [Impact Index Per Article: 40.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 01/23/2017] [Accepted: 02/14/2017] [Indexed: 12/16/2022]
Abstract
Psychosocial stress contributes to the development of anxiety and depression. Recent clinical studies have reported increased inflammatory leukocytes in circulation of individuals with stress-related psychiatric disorders. Parallel to this, our work in mice shows that social stress causes release of inflammatory monocytes into circulation. In addition, social stress caused the development of prolonged anxiety that was dependent on inflammatory monocytes in the brain. Therefore, we hypothesize that chronic stress drives the production of inflammatory monocytes that are actively recruited to the brain by microglia, and these monocytes augment neuroinflammatory signaling and prolong anxiety. Here we show that repeated social defeat stress in mice activated threat appraisal centers in the brain that spatially coincided with microglial activation and endothelial facilitation of monocyte recruitment. Moreover, microglial depletion with a CSF1R antagonist prior to stress prevented the recruitment of monocytes to the brain and abrogated the development of anxiety. Cell-specific transcriptional profiling revealed that microglia selectively enhanced CCL2 expression, while monocytes expressed the pro-inflammatory cytokine interleukin-1β (IL-1β). Consistent with these profiles, the recruited inflammatory monocytes with stress adhered to IL-1R1+ neurovascular endothelial cells and this interaction was blocked by microglial depletion. Furthermore, disruption of IL-1β signaling by caspase-1KO specifically within bone marrow-derived cells revealed that monocytes promoted anxiogenesis through stimulation of neurovascular IL-1R1 by IL-1β. Collectively, the development of anxiety during stress was caused by microglial recruitment of IL-1β-producing monocytes, which stimulated brain endothelial IL-1R1. Thus, monocyte IL-1β production represents a novel mechanism that underlies behavioral complications associated with stress-related psychiatric disorders.
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76
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Golbidi S, Li H, Laher I. Oxidative Stress: A Unifying Mechanism for Cell Damage Induced by Noise, (Water-Pipe) Smoking, and Emotional Stress-Therapeutic Strategies Targeting Redox Imbalance. Antioxid Redox Signal 2018; 28:741-759. [PMID: 29212347 DOI: 10.1089/ars.2017.7257] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
SIGNIFICANCE Modern technologies have eased our lives but these conveniences can impact our lifestyles in destructive ways. Noise pollution, mental stresses, and smoking (as a stress-relieving solution) are some environmental hazards that affect our well-being and healthcare budgets. Scrutinizing their pathophysiology could lead to solutions to reduce their harmful effects. Recent Advances: Oxidative stress plays an important role in initiating local and systemic inflammation after noise pollution, mental stress, and smoking. Lipid peroxidation and release of lysolipid by-products, disturbance in activation and function of nuclear factor erythroid 2-related factor 2 (Nrf2), induction of stress hormones and their secondary effects on intracellular kinases, and dysregulation of intracellular Ca2+ can all potentially trigger other vicious cycles. Recent clinical data suggest that boosting the antioxidant system through nonpharmacological measures, for example, lifestyle changes that include exercise have benefits that cannot easily be achieved with pharmacological interventions alone. CRITICAL ISSUES Indiscriminate manipulation of the cellular redox network could lead to a new series of ailments. An ideal approach requires meticulous scrutiny of redox balance mechanisms for individual pathologies so as to create new treatment strategies that target key pathways while minimizing side effects. FUTURE DIRECTIONS Extrapolating our understanding of redox balance to other debilitating conditions such as diabetes and the metabolic syndrome could potentially lead to devising a unifying therapeutic strategy. Antioxid. Redox Signal. 28, 741-759.
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Affiliation(s)
- Saeid Golbidi
- 1 Department of Pharmacology and Therapeutics, Faculty of Medicine, University of British Columbia , Vancouver, Canada
| | - Huige Li
- 2 Department of Pharmacology, Johannes Gutenberg University Medical Center , Mainz, Germany
| | - Ismail Laher
- 1 Department of Pharmacology and Therapeutics, Faculty of Medicine, University of British Columbia , Vancouver, Canada
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77
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Abstract
SIGNIFICANCE Social and demographic changes have led to an increased prevalence of loneliness and social isolation in modern society. Recent Advances: Population-based studies have demonstrated that both objective social isolation and the perception of social isolation (loneliness) are correlated with a higher risk of mortality and that both are clearly risk factors for cardiovascular disease (CVD). Lonely individuals have increased peripheral vascular resistance and elevated blood pressure. Socially isolated animals develop more atherosclerosis than those housed in groups. CRITICAL ISSUES Molecular mechanisms responsible for the increased cardiovascular risk are poorly understood. In recent reports, loneliness and social stress were associated with activation of the hypothalamic-pituitary-adrenocortical axis and the sympathetic nervous system. Repeated and chronic social stress leads to glucocorticoid resistance, enhanced myelopoiesis, upregulated proinflammatory gene expression, and oxidative stress. However, the causal role of these mechanisms in the development of loneliness-associated CVD remains unclear. FUTURE DIRECTIONS Elucidation of the molecular mechanisms of how CVD is induced by loneliness and social isolation requires additional studies. Understanding of the pathomechanisms is essential for the development of therapeutic strategies to prevent the detrimental effects of social stress on health. Antioxid. Redox Signal. 28, 837-851.
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Affiliation(s)
- Ning Xia
- 1 Department of Pharmacology, Johannes Gutenberg University Medical Center , Mainz, Germany
| | - Huige Li
- 1 Department of Pharmacology, Johannes Gutenberg University Medical Center , Mainz, Germany .,2 Center for Translational Vascular Biology (CTVB), Johannes Gutenberg University Medical Center , Mainz, Germany .,3 German Center for Cardiovascular Research (DZHK) , Partner Site Rhine-Main, Mainz, Germany
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78
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Sawicki CM, Kim JK, Weber MD, Jarrett BL, Godbout JP, Sheridan JF, Humeidan M. Ropivacaine and Bupivacaine prevent increased pain sensitivity without altering neuroimmune activation following repeated social defeat stress. Brain Behav Immun 2018; 69:113-123. [PMID: 29126979 PMCID: PMC5857417 DOI: 10.1016/j.bbi.2017.11.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 10/18/2017] [Accepted: 11/07/2017] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE Mounting evidence indicates that stress influences the experience of pain. Exposure to psychosocial stress disrupts bi-directional communication pathways between the central nervous system and peripheral immune system, and can exacerbate the frequency and severity of pain experienced by stressed subjects. Repeated social defeat (RSD) is a murine model of psychosocial stress that recapitulates the immune and behavioral responses to stress observed in humans, including activation of stress-reactive neurocircuitry and increased pro-inflammatory cytokine production. It is unclear, however, how these stress-induced neuroimmune responses contribute to increased pain sensitivity in mice exposed to RSD. Here we used a technique of regional analgesia with local anesthetics in mice to block the development of mechanical allodynia during RSD. We next investigated the degree to which pain blockade altered stress-induced neuroimmune activation and depressive-like behavior. METHODS Following development of a mouse model of regional analgesia with discrete sensory blockade over the dorsal-caudal aspect of the spine, C57BL/6 mice were divided into experimental groups and treated with Ropivacaine (0.08%), Liposomal Bupivacaine (0.08%), or Vehicle (0.9% NaCl) prior to exposure to stress. This specific region was selected for analgesia because it is the most frequent location for aggression-associated pain due to biting during RSD. Mechanical allodynia was assessed 12 h after the first, third, and sixth day of RSD after resolution of the sensory blockade. In a separate experiment, social avoidance behavior was determined after the sixth day of RSD. Blood, bone marrow, brain, and spinal cord were collected for immunological analyses after the last day of RSD in both experiments following behavioral assessments. RESULTS RSD increased mechanical allodynia in an exposure-dependent manner that persisted for at least one week following cessation of the stressor. Mice treated with either Ropivacaine or Liposomal Bupivacaine did not develop mechanical allodynia following exposure to stress, but did develop social avoidance behavior. Neither drug affected stress-induced activation of monocytes in the bone marrow, blood, or brain. Neuroinflammatory responses developed in all treatment groups, as evidenced by elevated IL-1β mRNA levels in the brain and spinal cord after RSD. CONCLUSIONS In this study, psychosocial stress was associated with increased pain sensitivity in mice. Development of mechanical allodynia with RSD was blocked by regional analgesia with local anesthetics, Ropivacaine or Liposomal Bupivacaine. Despite blocking mechanical allodynia, these anesthetic interventions did not prevent neuroimmune activation or social avoidance associated with RSD. These data suggest that stress-induced neuroinflammatory changes are not associated with increased sensitivity to pain following RSD. Thus, blocking peripheral nociception was effective in inhibiting enhanced pain signaling without altering stress-induced immune or behavioral responses.
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Affiliation(s)
- Caroline M Sawicki
- Division of Biosciences, The Ohio State University College of Dentistry, USA
| | - January K Kim
- Division of Biosciences, The Ohio State University College of Dentistry, USA
| | - Michael D Weber
- Division of Biosciences, The Ohio State University College of Dentistry, USA
| | - Brant L Jarrett
- Division of Biosciences, The Ohio State University College of Dentistry, USA; Department of Neuroscience, The Ohio State University Wexner Medical Center, USA
| | - Jonathan P Godbout
- Institute for Behavioral Medicine Research, The Ohio State University College of Medicine, USA; Department of Neuroscience, The Ohio State University Wexner Medical Center, USA
| | - John F Sheridan
- Division of Biosciences, The Ohio State University College of Dentistry, USA; Institute for Behavioral Medicine Research, The Ohio State University College of Medicine, USA; Department of Neuroscience, The Ohio State University Wexner Medical Center, USA.
| | - Michelle Humeidan
- Institute for Behavioral Medicine Research, The Ohio State University College of Medicine, USA; Department of Anesthesiology, The Ohio State University Wexner Medical Center, USA.
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79
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Corticosterone Production during Repeated Social Defeat Causes Monocyte Mobilization from the Bone Marrow, Glucocorticoid Resistance, and Neurovascular Adhesion Molecule Expression. J Neurosci 2018; 38:2328-2340. [PMID: 29382712 DOI: 10.1523/jneurosci.2568-17.2018] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 01/09/2018] [Accepted: 01/17/2018] [Indexed: 02/08/2023] Open
Abstract
Repeated social defeat (RSD) stress promotes the release of bone marrow-derived monocytes into circulation that are recruited to the brain, where they augment neuroinflammation and cause prolonged anxiety-like behavior. Physiological stress activates the sympathetic nervous system and hypothalamic-pituitary-adrenal gland (HPA) axis, and both of these systems play a role in the physiological, immunological, and behavioral responses to stress. The purpose of this study was to delineate the role of HPA activation and corticosterone production in the immunological responses to stress in male C57BL/6 mice. Here, surgical (adrenalectomy) and pharmacological (metyrapone) interventions were used to abrogate corticosterone signaling during stress. We report that both adrenalectomy and metyrapone attenuated the stress-induced release of monocytes into circulation. Neither intervention altered the production of monocytes during stress, but both interventions enhanced retention of these cells in the bone marrow. Consistent with this observation, adrenalectomy and metyrapone also prevented the stress-induced reduction of a key retention factor, CXCL12, in the bone marrow. Corticosterone depletion with metyrapone also abrogated the stress-induced glucocorticoid resistance of myeloid cells. In the brain, these corticosterone-associated interventions attenuated stress-induced microglial remodeling, neurovascular expression of the adhesion molecule intercellular cell adhesion molecule-1, prevented monocyte accumulation and neuroinflammatory signaling. Overall, these results indicate that HPA activation and corticosterone production during repeated social defeat stress are critical for monocyte release into circulation, glucocorticoid resistance of myeloid cells, and enhanced neurovascular cell adhesion molecule expression.SIGNIFICANCE STATEMENT Recent studies of stress have identified the presence of monocytes that show an exaggerated inflammatory response to immune challenge and are resistant to the suppressive effects of glucocorticoids. Increased presence of these proinflammatory monocytes has been implicated in neuropsychiatric symptoms and the development of chronic cardiovascular, autoimmune, and metabolic disorders. In the current study, we show novel evidence that corticosterone produced during stress enhances the release of proinflammatory monocytes from the bone marrow into circulation, augments their recruitment to the brain and the induction of a neuroinflammatory profile. Overproduction of corticosterone during stress is also the direct cause of glucocorticoid resistance, a key phenotype in individuals exposed to chronic stress. Inhibiting excess corticosterone production attenuates these inflammatory responses to stress.
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80
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Zang X, Zheng X, Hou Y, Hu M, Wang H, Bao X, Zhou F, Wang G, Hao H. Regulation of proinflammatory monocyte activation by the kynurenine–AhR axis underlies immunometabolic control of depressive behavior in mice. FASEB J 2018; 32:1944-1956. [DOI: 10.1096/fj.201700853r] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xiaojie Zang
- State Key Laboratory of Natural MedicinesSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Laboratory of Metabolic Regulation and Drug Target DiscoverySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Jiangsu Province Key Laboratory of Drug MetabolismSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
| | - Xiao Zheng
- State Key Laboratory of Natural MedicinesSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Laboratory of Metabolic Regulation and Drug Target DiscoverySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Jiangsu Province Key Laboratory of Drug MetabolismSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Department of PharmacologySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
| | - Yuanlong Hou
- State Key Laboratory of Natural MedicinesSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Laboratory of Metabolic Regulation and Drug Target DiscoverySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Jiangsu Province Key Laboratory of Drug MetabolismSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
| | - Miaomiao Hu
- State Key Laboratory of Natural MedicinesSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Laboratory of Metabolic Regulation and Drug Target DiscoverySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Jiangsu Province Key Laboratory of Drug MetabolismSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
| | - Hong Wang
- State Key Laboratory of Natural MedicinesSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Laboratory of Metabolic Regulation and Drug Target DiscoverySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Jiangsu Province Key Laboratory of Drug MetabolismSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
| | - Xiaoqiang Bao
- Animal Experimental Center, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical UniversityNanjingChina
| | - Fang Zhou
- State Key Laboratory of Natural MedicinesSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Laboratory of Metabolic Regulation and Drug Target DiscoverySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Jiangsu Province Key Laboratory of Drug MetabolismSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
| | - Guangji Wang
- State Key Laboratory of Natural MedicinesSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Laboratory of Metabolic Regulation and Drug Target DiscoverySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Jiangsu Province Key Laboratory of Drug MetabolismSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
| | - Haiping Hao
- State Key Laboratory of Natural MedicinesSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Laboratory of Metabolic Regulation and Drug Target DiscoverySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Jiangsu Province Key Laboratory of Drug MetabolismSchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
- Department of PharmacologySchool of Pharmacy, and China Pharmaceutical UniversityNanjingChina
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81
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Padurariu M, Antioch I, Balmus I, Ciobica A, El-Lethey HS, Kamel MM. Describing some behavioural animal models of anxiety and their mechanistics with special reference to oxidative stress and oxytocin relevance. Int J Vet Sci Med 2017; 5:98-104. [PMID: 30255057 PMCID: PMC6137856 DOI: 10.1016/j.ijvsm.2017.08.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 08/14/2017] [Accepted: 08/29/2017] [Indexed: 12/14/2022] Open
Abstract
It is now generally accepted that animal studies are playing an important role in the understanding of anxiety disorders, since they contribute to the current knowledge regarding the mechanisms and possible therapeutic approaches in anxiety. In the present review we will detail some essential aspects of behavioral animal models of anxiety related to social defeat paradigm, elevated plus maze, elevated zero or T maze, light/dark box, social interaction test or tests based on predator models, considering the latest theories and methodological approaches in this area of research, as well as our previous studies focusing on anxiety manifestations in a variety of species including rats, zebrafish, dogs and pigs. Moreover, in this context, we will focus on the recent theories concerning oxidative stress, as well as importance of oxytocin administration (especially the intranasal route). This could be important considering that these two factors are currently being investigated as possible mechanisms (oxidative stress status) and related therapeutic target (both intranasal oxytocin and antioxidants) in the pathology of the anxiety disorders.
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Affiliation(s)
- Manuela Padurariu
- “Grigore T. Popa” University of Medicine and Pharmacy, 16, Universitatii Street, 700115 Iasi, Romania
| | - Iulia Antioch
- “Alexandru Ioan Cuza” University, 11, Carol I, 700506 Iaşi, Romania
| | - Ioana Balmus
- “Alexandru Ioan Cuza” University, 11, Carol I, 700506 Iaşi, Romania
| | - Alin Ciobica
- Department of Research, Faculty of Biology, “Alexandru Ioan Cuza” University, 11, Carol I, 700506 Iaşi, Romania
- Center of Biomedical Research of the Romanian Academy, Iasi Branch, Romania
- The Academy of the Romanian Scientists, Bucharest, Splaiul Independentei 54, 050094, Romania
| | - Heba S. El-Lethey
- Department of Animal Hygiene and Management, Faculty of Veterinary Medicine, Cairo University, Cairo, Egypt
| | - Mervat M. Kamel
- Department of Animal Hygiene and Management, Faculty of Veterinary Medicine, Cairo University, Cairo, Egypt
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82
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Li Y, Jiang W, Li ZZ, Zhang C, Huang C, Yang J, Kong GY, Li ZF. Repetitive restraint stress changes spleen immune cell subsets through glucocorticoid receptor or β-adrenergic receptor in a stage dependent manner. Biochem Biophys Res Commun 2017; 495:1108-1114. [PMID: 29175389 DOI: 10.1016/j.bbrc.2017.11.148] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 11/22/2017] [Indexed: 12/30/2022]
Abstract
Immune system is sensitive to stress. Spleen is the largest peripheral immune organ innervated with sympathetic nerves and controlled by adrenomedullary system in the body. However, the alterations and mechanism of spleen immune cell subsets caused by repetitive restraint stress (RRS) is poorly understood. In this study, we found that RRS reduced spleen index in mice, and induced an expansion of white pulp and involution of the red pulp. Meanwhile, the percentage of CD3+CD8+ T lymphocytes, CD11b+F4/80+ macrophages, CD11b+Ly-6G-Ly-6Chi monocytic myeloid derived suppressor cells (mMDSCs) and CD11b+Ly-6G+Ly-6Cint granulocytic myeloid derived suppressor cells (gMDSCs) in spleen were significantly changed by RRS. Mechanistically, we found that the expression of norepinephrine (NE) and β-adrenergic receptor (β-AR) in spleen were up-regulated after 21 days of RRS, but not 7 days. The expression of corticosterone (CORT) and glucocorticoid receptor (GR) in spleen were up-regulated after 7 days of RRS but were lower after 21 days of RRS, even though they were still higher than that in mice without stress. By treating the stressed mice with RU486 (antagonist of GR) or propranolol (antagonist of β-AR), we demonstrated that GR was responsible for the changes of spleen induced by 7 days of RRS and β-AR was for 21 days of RRS. Our data suggest that RRS changes spleen immune cell subsets through GR or β-AR in a stage dependent manner.
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Affiliation(s)
- Yu Li
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China; Shaanxi Provincial Clinical Research Center for Hepatic & Splenic Diseases, Xi'an, China; Department of General Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Wei Jiang
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China; Shaanxi Provincial Clinical Research Center for Hepatic & Splenic Diseases, Xi'an, China; Department of General Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Zhen-Zhen Li
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Chen Zhang
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Chen Huang
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China; Key Laboratory of Environment and Disease-Related Gene, Ministry of Education, Xi'an Jiaotong University, Xi'an, China
| | - Jun Yang
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China; Department of Pathology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
| | - Guang-Yao Kong
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
| | - Zong-Fang Li
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China; Shaanxi Provincial Clinical Research Center for Hepatic & Splenic Diseases, Xi'an, China; Department of General Surgery, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
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83
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Stein DJ, Vasconcelos MF, Albrechet-Souza L, Ceresér KMM, de Almeida RMM. Microglial Over-Activation by Social Defeat Stress Contributes to Anxiety- and Depressive-Like Behaviors. Front Behav Neurosci 2017; 11:207. [PMID: 29114211 PMCID: PMC5660717 DOI: 10.3389/fnbeh.2017.00207] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 10/10/2017] [Indexed: 12/18/2022] Open
Abstract
Hyper activation of the neuroimmune system is strongly related to the development of neuropsychiatric disorders. Psychosocial stress has been postulated to play an important role in triggering anxiety and major depression. In preclinical models, there is mounting evidence that social defeat stress activates microglial cells in the central nervous system. This type of stress could be one of the major factors in the development of these psychopathologies. Here, we reviewed the most recent literature on social defeat and the associated immunological reactions. We focused our attention on microglial cells and kept the effect of social defeat over microglia separate from the effect of this stressor on other immune cells and the influence of peripheral immune components in priming central immune reactions. Furthermore, we considered how social defeat stress affects microglial cells and the consequent development of anxiety- and depressive-like states in preclinical studies. We highlighted evidence for the negative impact of the over-activation of the neuroimmune system, especially by the overproduction of pro-inflammatory mediators and cytotoxins. Overproduction of these molecules may cause cellular damage and loss or decreased function of neuronal activity by excessively pruning synaptic connections that ultimately contribute to the development of anxiety- and depressive-like states.
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Affiliation(s)
- Dirson J. Stein
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Post-Graduate Program in Psychiatry and Behavioral Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Lucas Albrechet-Souza
- Psychology Institute, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Keila M. M. Ceresér
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Post-Graduate Program in Psychiatry and Behavioral Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Rosa M. M. de Almeida
- Psychology Institute, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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84
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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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85
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Spleen contributes to restraint stress induced changes in blood leukocytes distribution. Sci Rep 2017; 7:6501. [PMID: 28747688 PMCID: PMC5529540 DOI: 10.1038/s41598-017-06956-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 06/19/2017] [Indexed: 12/22/2022] Open
Abstract
Psychological stress has great impacts on the immune system, particularly the leukocytes distribution. Although the impacts of acute stress on blood leukocytes distribution are well studied, however, it remains unclear how chronic stress affects leukocytes distribution in peripheral circulation. Furthermore, there is no report about the role of spleen in the blood leukocytes distribution induced by stress. Here we show that spleen contributes to the alteration of restraint stress induced blood leukocytes distribution. Our data confirmed that restraint stress induced anxiety-like behavior in mice. Furthermore, we found that restraint stress decreased the CD4/CD8 ratio and elevated the percentages of natural killer cells, monocytes and polymorphonuclear myeloid-derived suppressor cell. We demonstrated that activation of hypothalamic-pituitary-adrenal axis (HPA) and sympathetic nervous system (SNS) contributes to restraint stress induced alteration of blood leukocyte distribution. Interestingly, we found that splenectomy could reverse the change of CD4/CD8 ratio induced by restraint stress. Together, our findings suggest that activation of HPA axis and SNS was responsible for the blood leukocyte subsets changes induced by restraint stress. Spleen, at least in part, contributed to the alteration in peripheral circulation induced by restraint stress.
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86
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Bekhbat M, Rowson SA, Neigh GN. Checks and balances: The glucocorticoid receptor and NFĸB in good times and bad. Front Neuroendocrinol 2017; 46:15-31. [PMID: 28502781 PMCID: PMC5523465 DOI: 10.1016/j.yfrne.2017.05.001] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/21/2017] [Accepted: 05/09/2017] [Indexed: 01/23/2023]
Abstract
Mutual regulation and balance between the endocrine and immune systems facilitate an organism's stress response and are impaired following chronic stress or prolonged immune activation. Concurrent alterations in stress physiology and immunity are increasingly recognized as contributing factors to several stress-linked neuropsychiatric disorders including depression, anxiety, and post-traumatic stress disorder. Accumulating evidence suggests that impaired balance and crosstalk between the glucocorticoid receptor (GR) and nuclear factor kappa-light-chain-enhancer of activated B cells (NFκB) - effectors of the stress and immune axes, respectively - may play a key role in mediating the harmful effects of chronic stress on mood and behavior. Here, we first review the molecular mechanisms of GR and NFκB interactions in health, then describe potential shifts in the GR-NFκB dynamics in chronic stress conditions within the context of brain circuitry relevant to neuropsychiatric diseases. Furthermore, we discuss developmental influences and sex differences in the regulation of these two transcription factors.
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Affiliation(s)
- Mandakh Bekhbat
- Emory University, Graduate Division of Biological Sciences, Neuroscience Graduate Program, United States
| | - Sydney A Rowson
- Emory University, Graduate Division of Biological Sciences, Molecular and Systems Pharmacology Graduate Studies Program, United States
| | - Gretchen N Neigh
- Virginia Commonwealth University, Department of Anatomy & Neurobiology, United States.
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87
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Salazar TE, Richardson MR, Beli E, Ripsch MS, George J, Kim Y, Duan Y, Moldovan L, Yan Y, Bhatwadekar A, Jadhav V, Smith JA, McGorray S, Bertone AL, Traktuev DO, March KL, Colon-Perez LM, Avin K, Sims E, Mund JA, Case J, Deng S, Kim MS, McDavitt B, Boulton ME, Thinschmidt J, Calzi SL, Fitz SD, Fuchs RK, Warden SJ, McKinley T, Shekhar A, Febo M, Johnson PL, Chang LJ, Gao Z, Kolonin MG, Lai S, Ma J, Dong X, White FA, Xie H, Yoder MC, Grant MB. Electroacupuncture Promotes Central Nervous System-Dependent Release of Mesenchymal Stem Cells. Stem Cells 2017; 35:1303-1315. [PMID: 28299842 PMCID: PMC5530374 DOI: 10.1002/stem.2613] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/16/2017] [Accepted: 02/11/2017] [Indexed: 12/12/2022]
Abstract
Electroacupuncture (EA) performed in rats and humans using limb acupuncture sites, LI-4 and LI-11, and GV-14 and GV-20 (humans) and Bai-hui (rats) increased functional connectivity between the anterior hypothalamus and the amygdala and mobilized mesenchymal stem cells (MSCs) into the systemic circulation. In human subjects, the source of the MSC was found to be primarily adipose tissue, whereas in rodents the tissue sources were considered more heterogeneous. Pharmacological disinhibition of rat hypothalamus enhanced sympathetic nervous system (SNS) activation and similarly resulted in a release of MSC into the circulation. EA-mediated SNS activation was further supported by browning of white adipose tissue in rats. EA treatment of rats undergoing partial rupture of the Achilles tendon resulted in reduced mechanical hyperalgesia, increased serum interleukin-10 levels and tendon remodeling, effects blocked in propranolol-treated rodents. To distinguish the afferent role of the peripheral nervous system, phosphoinositide-interacting regulator of transient receptor potential channels (Pirt)-GCaMP3 (genetically encoded calcium sensor) mice were treated with EA acupuncture points, ST-36 and LIV-3, and GV-14 and Bai-hui and resulted in a rapid activation of primary sensory neurons. EA activated sensory ganglia and SNS centers to mediate the release of MSC that can enhance tissue repair, increase anti-inflammatory cytokine production and provide pronounced analgesic relief. Stem Cells 2017;35:1303-1315.
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Affiliation(s)
- Tatiana E. Salazar
- Genetics Institute, University of Florida, Gainesville, FL 32610, USA
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Matthew R. Richardson
- Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Eleni Beli
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Matthew S. Ripsch
- Department of Anesthesia, Indiana University, Indianapolis, IN 46202, USA
| | - John George
- College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Youngsook Kim
- Department of Anesthesia, Indiana University, Indianapolis, IN 46202, USA
| | - Yaqian Duan
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Leni Moldovan
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Yuanqing Yan
- Genetics Institute, University of Florida, Gainesville, FL 32610, USA
| | - Ashay Bhatwadekar
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Vaishnavi Jadhav
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Jared A. Smith
- Department of Anesthesia, Indiana University, Indianapolis, IN 46202, USA
| | - Susan McGorray
- Department of Biostatistics, University of Florida, Gainesville, FL 32610, USA
| | - Alicia L. Bertone
- Department of Veterinary Clinical Sciences, The Ohio State University, Columbus, OH 43210, USA
| | - Dmitri O. Traktuev
- Krannert Institute of Cardiology, Indiana University, Indianapolis, IN 46202, USA
- Indiana Center for Vascular Biology and Medicine, Indiana University, Indianapolis, IN 46202, USA
| | - Keith L. March
- Krannert Institute of Cardiology, Indiana University, Indianapolis, IN 46202, USA
- Indiana Center for Vascular Biology and Medicine, Indiana University, Indianapolis, IN 46202, USA
| | - Luis M. Colon-Perez
- Department of Psychiatry, University of Florida, McKnight Brain Institute, Gainesville, FL 32610, USA
| | - Keith Avin
- Department of Physical Therapy, Indiana University School of Health and Rehabilitation Sciences, Indianapolis, IN 46202, USA
| | - Emily Sims
- Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN 46202, USA
| | - Julie A. Mund
- Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN 46202, USA
| | - Jamie Case
- Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN 46202, USA
- Scripps Clinic Medical Group, Scripps Center for Organ and Cell Transplantation, La Jolla, CA 92037, USA
- Department of Pediatrics, Indiana University, Indianapolis, IN 46202USA
| | - Shaolin Deng
- Mainland Acupuncture, Gainesville, FL 32653, USA
| | - Min Su Kim
- College of Veterinary Medicine, Chon Buk National University, Jeonju, South Korea
| | | | - Michael E. Boulton
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Jeffrey Thinschmidt
- Department of Pharmacology, University of Florida, Gainesville, FL 32610, USA
| | - Sergio Li Calzi
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Stephanie D. Fitz
- Department of Physical Therapy, Indiana University School of Health and Rehabilitation Sciences, Indianapolis, IN 46202, USA
| | - Robyn K. Fuchs
- Department of Physical Therapy, Indiana University School of Health and Rehabilitation Sciences, Indianapolis, IN 46202, USA
| | - Stuart J. Warden
- Department of Physical Therapy, Indiana University School of Health and Rehabilitation Sciences, Indianapolis, IN 46202, USA
| | - Todd McKinley
- Department of Orthopedic Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Anantha Shekhar
- Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Marcelo Febo
- Department of Psychiatry, University of Florida, McKnight Brain Institute, Gainesville, FL 32610, USA
| | - Phillip L. Johnson
- Department of Anatomy & Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Lung Ji Chang
- Department of Molecular Genetics & Microbiology, University of Florida, Gainesville, FL 32611, USA
| | - Zhanguo Gao
- Center for Metabolic and Degenerative Diseases, Harry E. Bovay Institute of Molecular Medicine University of Texas Health Science Center, Houston, TX 77030, USA
| | - Mikhail G. Kolonin
- Center for Metabolic and Degenerative Diseases, Harry E. Bovay Institute of Molecular Medicine University of Texas Health Science Center, Houston, TX 77030, USA
| | - Song Lai
- Department of Radiation Oncology, University of Florida School of Medicine, Gainesville, FL 32610, USA
| | - Jinfeng Ma
- Department of Radiation Oncology, University of Florida School of Medicine, Gainesville, FL 32610, USA
| | - Xinzhong Dong
- Department of Neuroscience, Center of Sensory Biology, the Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Fletcher A. White
- Department of Anesthesia, Indiana University, Indianapolis, IN 46202, USA
| | - Huisheng Xie
- College of Veterinary Medicine, University of Florida, Gainesville, FL 32608, USA
| | - Mervin C. Yoder
- Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Indiana University Melvin and Bren Simon Cancer Center, Indianapolis, IN 46202, USA
| | - Maria B. Grant
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
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88
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Galley JD, Mackos AR, Varaljay VA, Bailey MT. Stressor exposure has prolonged effects on colonic microbial community structure in Citrobacter rodentium-challenged mice. Sci Rep 2017; 7:45012. [PMID: 28344333 PMCID: PMC5366811 DOI: 10.1038/srep45012] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 02/20/2017] [Indexed: 12/13/2022] Open
Abstract
Stressor exposure significantly affects the colonic mucosa-associated microbiota, and exacerbates Citrobacter rodentium-induced inflammation, effects that can be attenuated with probiotic Lactobacillus reuteri. This study assessed the structure of the colonic mucosa-associated microbiota in mice exposed to a social stressor (called social disruption), as well as non-stressed control mice, during challenge with the colonic pathogen C. rodentium. Mice were exposed to the social stressor or home cage control conditions for six consecutive days and all mice were challenged with C. rodentium immediately following the first exposure to the stressor. In addition, mice received probiotic L. reuteri, or vehicle as a control, via oral gavage following each stressor exposure. The stressor-exposed mice had significant differences in microbial community composition compared to non-stressed control mice. This difference was first evident following the six-cycle exposure to the stressor, on Day 6 post-C. rodentium challenge, and persisted for up to 19 days after stressor termination. Mice exposed to the stressor had different microbial community composition regardless of whether they were treated with L. reuteri or treated with vehicle as a control. These data indicate that stressor exposure affects the colonic microbiota during challenge with C. rodentium, and that these effects are long-lasting and not attenuated by probiotic L. reuteri.
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Affiliation(s)
- Jeffrey D Galley
- Biosciences, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Amy R Mackos
- Biosciences, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Vanessa A Varaljay
- Biosciences, College of Dentistry, The Ohio State University, Columbus, OH, USA
| | - Michael T Bailey
- Biosciences, College of Dentistry, The Ohio State University, Columbus, OH, USA
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89
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Lafuse WP, Gearinger R, Fisher S, Nealer C, Mackos AR, Bailey MT. Exposure to a Social Stressor Induces Translocation of Commensal Lactobacilli to the Spleen and Priming of the Innate Immune System. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2017; 198:2383-2393. [PMID: 28167628 PMCID: PMC5340647 DOI: 10.4049/jimmunol.1601269] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 01/05/2017] [Indexed: 12/18/2022]
Abstract
Studies have shown that exposure to psychological stressors leads to inflammation throughout the body. This has been widely studied using social disruption (SDR), a social stressor that involves repeated social defeat in subordinate mice. Exposure to SDR increases serum cytokine levels, results in accumulation of spleen CD11b+ myeloid cells, and primes macrophages for increased cytokine and microbicidal activity. Our previous studies showed that intestinal microbes are necessary for SDR-enhancement of innate immunity. In this study, we show that SDR increases spleen CD11b+Ly6CintermLy6G+ neutrophil and CD11b+Ly6ChiLy6G-monocyte numbers compared with control mice. Further, we found that neutrophils and monocytes from stressor-exposed mice expressed higher levels of IL-1β mRNA. To determine whether bacterial translocation may contribute to these effects, bacterial 16S rRNA was quantified using quantitative real-time RT-PCR with bacterial group-specific primers. Exposure to the SDR stressor specifically increased Lactobacillus RNA in the spleen, which localized in spleen monocytes. The increased spleen levels of Lactobacillus 16S rRNA in SDR mice positively correlated with increased levels of IL-1β and IL-23 mRNA. Our findings indicate that during stressor exposure, Lactobacillus spp. can translocate to the spleen and prime the innate immune system for enhanced reactivity.
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Affiliation(s)
- William P Lafuse
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210
- Center for Microbial Interface Biology, The Ohio State University, Columbus, OH 43210
| | - Rachel Gearinger
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210
- Center for Microbial Interface Biology, The Ohio State University, Columbus, OH 43210
| | - Sydney Fisher
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210
- Center for Microbial Pathogenesis, The Research Institute at Nationwide Children's Hospital, Columbus, OH 43210; and
| | - Connor Nealer
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH 43210
- Center for Microbial Interface Biology, The Ohio State University, Columbus, OH 43210
| | - Amy R Mackos
- Center for Microbial Pathogenesis, The Research Institute at Nationwide Children's Hospital, Columbus, OH 43210; and
| | - Michael T Bailey
- Center for Microbial Interface Biology, The Ohio State University, Columbus, OH 43210;
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210
- Center for Microbial Pathogenesis, The Research Institute at Nationwide Children's Hospital, Columbus, OH 43210; and
- Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH 43210
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90
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Psychosocial stress on neuroinflammation and cognitive dysfunctions in Alzheimer's disease: the emerging role for microglia? Neurosci Biobehav Rev 2017; 77:148-164. [PMID: 28185874 DOI: 10.1016/j.neubiorev.2017.01.046] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 01/20/2017] [Accepted: 01/31/2017] [Indexed: 01/22/2023]
Abstract
Chronic psychosocial stress is increasingly recognized as a risk factor for late-onset Alzheimer's disease (LOAD) and associated cognitive deficits. Chronic stress also primes microglia and induces inflammatory responses in the adult brain, thereby compromising synapse-supportive roles of microglia and deteriorating cognitive functions during aging. Substantial evidence demonstrates that failure of microglia to clear abnormally accumulating amyloid-beta (Aβ) peptide contributes to neuroinflammation and neurodegeneration in AD. Moreover, genome-wide association studies have linked variants in several immune genes, such as TREM2 and CD33, the expression of which in the brain is restricted to microglia, with cognitive dysfunctions in LOAD. Thus, inflammation-promoting chronic stress may create a vicious cycle of aggravated microglial dysfunction accompanied by increased Aβ accumulation, collectively exacerbating neurodegeneration. Surprisingly, however, little is known about whether and how chronic stress contributes to microglia-mediated neuroinflammation that may underlie cognitive impairments in AD. This review aims to summarize the currently available clinical and preclinical data and outline potential molecular mechanisms linking stress, microglia and neurodegeneration, to foster future research in this field.
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91
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Weber MD, Godbout JP, Sheridan JF. Repeated Social Defeat, Neuroinflammation, and Behavior: Monocytes Carry the Signal. Neuropsychopharmacology 2017; 42:46-61. [PMID: 27319971 PMCID: PMC5143478 DOI: 10.1038/npp.2016.102] [Citation(s) in RCA: 192] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 04/28/2016] [Accepted: 05/27/2016] [Indexed: 02/06/2023]
Abstract
Mounting evidence indicates that proinflammatory signaling in the brain affects mood, cognition, and behavior and is linked with the etiology of psychiatric disorders, including anxiety and depression. The purpose of this review is to focus on stress-induced bidirectional communication pathways between the central nervous system (CNS) and peripheral immune system that converge to promote a heightened neuroinflammatory environment. These communication pathways involve sympathetic outflow from the brain to the peripheral immune system that biases hematopoietic stem cells to differentiate into a glucocorticoid-resistant and primed myeloid lineage immune cell. In conjunction, microglia-dependent neuroinflammatory events promote myeloid cell trafficking to the brain that reinforces stress-related behavior, and is argued to play a role in stress-related psychiatric disorders. We will discuss evidence implicating a key role for endothelial cells that comprise the blood-brain barrier in propagating peripheral-to-central immune communication. We will also discuss novel neuron-to-glia communication pathways involving endogenous danger signals that have recently been argued to facilitate neuroinflammation under various conditions, including stress. These findings help elucidate the complex communication that occurs in response to stress and highlight novel therapeutic targets against the development of stress-related psychiatric disorders.
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Affiliation(s)
- Michael D Weber
- Division of Biosciences, The Ohio State University, Columbus, OH, USA,Center for Brain and Spinal Cord Repair, The Ohio State University, Columbus, OH, USA,Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA,Division of Biosciences, The Ohio State University, 223 IBMR Building, 305 W 12th Avenue, 460 Medical Center Drive, Columbus, OH 43210, USA, Tel: 614-293-3392, Fax: 614-292-6087, E-mail:
| | - Jonathan P Godbout
- Center for Brain and Spinal Cord Repair, The Ohio State University, Columbus, OH, USA,Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA,Department of Neuroscience, The Ohio State University, Columbus, OH, USA
| | - John F Sheridan
- Division of Biosciences, The Ohio State University, Columbus, OH, USA,Center for Brain and Spinal Cord Repair, The Ohio State University, Columbus, OH, USA,Institute for Behavioral Medicine Research, The Ohio State University, Columbus, OH, USA
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92
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Wang Z, Caughron B, Young MRI. Posttraumatic Stress Disorder: An Immunological Disorder? Front Psychiatry 2017; 8:222. [PMID: 29163241 PMCID: PMC5681483 DOI: 10.3389/fpsyt.2017.00222] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 10/23/2017] [Indexed: 12/15/2022] Open
Abstract
Patients with posttraumatic stress disorder (PTSD) exhibit an increased state of inflammation. Various animal models for PTSD have shown some of the same immune imbalances as have been shown in human subjects with PTSD, and some of these studies are discussed in this review. However, animal studies can only indirectly implicate immune involvement in PTSD in humans. This review of mainly studies with human subjects focuses on dissecting the immunological role in the pathogenesis of PTSD following initial trauma exposure. It addresses both the inflammatory state associated with PTSD and the immune imbalance between stimulatory and inhibitory immune mediators, as well as variables that can lead to discrepancies between analyses. The concept of immunological treatment approaches is proposed for PTSD, as new treatments are needed for this devastating disorder that is affecting unprecedented numbers of Veterans from the long-standing wars in the Middle East and which affects civilians following severe trauma.
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Affiliation(s)
- Zhewu Wang
- Mental Health Service, Ralph H. Johnson VA Medical Center, Charleston, SC, United States.,Department of Psychiatry, Medical University of South Carolina, Charleston, SC, United States
| | - Blaine Caughron
- Research Service, Ralph H. Johnson VA Medical Center, Charleston, SC, United States
| | - M Rita I Young
- Research Service, Ralph H. Johnson VA Medical Center, Charleston, SC, United States.,Department of Otolaryngology - Head and Neck Surgery, Medical University of South Carolina, Charleston, SC, United States
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93
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Francis M, Sun R, Cervelli JA, Choi H, Mandal M, Abramova EV, Gow AJ, Laskin JD, Laskin DL. Editor's Highlight: Role of Spleen-Derived Macrophages in Ozone-Induced Lung Inflammation and Injury. Toxicol Sci 2016; 155:182-195. [PMID: 27708193 DOI: 10.1093/toxsci/kfw192] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Macrophages and inflammatory mediators have been implicated in ozone toxicity. In these studies, we used splenectomized (SPX) mice to assess the contribution of splenic monocytes to pulmonary inflammation and injury induced by ozone. Cells and tissue were collected 24-72 h after exposure of mice to air or ozone (0.8 ppm, 3 h). Following ozone exposure, increased numbers of pro-inflammatory CD11b + Ly6CHi and anti-inflammatory CD11b + Ly6CLo monocytes were observed in spleens of control (CTL) mice. CD11b + Ly6CHi and MMP-9+ pro-inflammatory macrophages were also observed in lungs of CTL mice after ozone, along with CD11b + Ly6CLo and mannose receptor (MR)+ anti-inflammatory macrophages. This was accompanied by increased lung expression of proteins involved in monocyte/macrophage trafficking including CCL3, CCL4, CCR1, and AT1R. Splenectomy resulted in decreases in pro-inflammatory macrophages in the lung and down regulation of CCR2, CCL2, and CCL4, but increases in CD11b + Ly6CLo anti-inflammatory macrophages. CD11b+Ly6G+Ly6C+ granulocytic (G)- and monocytic (M)-myeloid derived suppressor cells (MDSC)s were also detected in the lungs and spleens of CTL mice; these increased after ozone exposure. Splenectomy was associated with a decrease in G-MDSCs in the lung, with no effect on M-MDSCs. Changes in lung macrophage subpopulations and MDSCs in SPX mice were correlated with reduced ozone toxicity, as measured by decreases in bronchoalveolar lavage protein content and reduced 4-hydroxynonenal expression in the lung. These data suggest that the spleen is a source of pro-inflammatory/cytotoxic macrophages that contribute to ozone-induced lung injury, inflammation, and oxidative stress.
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Affiliation(s)
- Mary Francis
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, Piscataway, New Jersey
| | - Richard Sun
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, Piscataway, New Jersey
| | - Jessica A Cervelli
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, Piscataway, New Jersey
| | - Hyejeong Choi
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, Piscataway, New Jersey
| | - Mili Mandal
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, Piscataway, New Jersey
| | - Elena V Abramova
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, Piscataway, New Jersey
| | - Andrew J Gow
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, Piscataway, New Jersey
| | - Jeffrey D Laskin
- Department of Environmental and Occupational Health, Rutgers University School of Public Health, Piscataway, New Jersey
| | - Debra L Laskin
- Department of Pharmacology and Toxicology, Rutgers University Ernest Mario School of Pharmacy, Piscataway, New Jersey;
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94
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Restoration of Immune Responsiveness to Glioma by Vaccination of Mice with Established Brain Gliomas with a Semi-Allogeneic Vaccine. Int J Mol Sci 2016; 17:ijms17091465. [PMID: 27598146 PMCID: PMC5037743 DOI: 10.3390/ijms17091465] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 08/23/2016] [Accepted: 08/29/2016] [Indexed: 01/29/2023] Open
Abstract
Prior studies had shown the clinical efficacy of a semi-allogeneic glioma vaccine in mice with lethal GL261 gliomas. This was confirmed in the present study. As subcutaneous vaccination resulted in protection against tumor in the brain, the present study assessed the impact of this vaccination of mice bearing established GL261 brain gliomas on their cytokine production upon in vitro exposure to tumor-derived products. Mice with established GL261 brain gliomas were vaccinated subcutaneously with H-2b GL261 glioma cells fused with H-2d RAG-neo cells or with a mock vaccine of phosphate-buffered saline. The results of these analyses show that the presence of GL261 tumor-conditioned medium resulted in increased production of Th1, inflammatory and inhibitory cytokines by spleen cells from control mice and from vaccinated glioma-bearing mice. In contrast, spleen cells of tumor-bearing, mock-vaccinated mice produced lower levels of cytokines in the presence of tumor-conditioned media. However, these results also show that there was not a heightened level of cytokine production in the presence of tumor-conditioned medium by spleen cells of vaccinated mice over the production by spleen cells of control mice. Overall, these results show that vaccination slows growth of the GL261 tumors to the point where GL261-vaccinated mice do not show the signs of morbidly or splenic dysfunction exhibited by unvaccinated, late stage glioma-bearing mice.
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95
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Neuroinflammatory Dynamics Underlie Memory Impairments after Repeated Social Defeat. J Neurosci 2016; 36:2590-604. [PMID: 26937001 DOI: 10.1523/jneurosci.2394-15.2016] [Citation(s) in RCA: 149] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
UNLABELLED Repeated social defeat (RSD) is a murine stressor that recapitulates key physiological, immunological, and behavioral alterations observed in humans exposed to chronic psychosocial stress. Psychosocial stress promotes prolonged behavioral adaptations that are associated with neuroinflammatory signaling and impaired neuroplasticity. Here, we show that RSD promoted hippocampal neuroinflammatory activation that was characterized by proinflammatory gene expression and by microglia activation and monocyte trafficking that was particularly pronounced within the caudal extent of the hippocampus. Because the hippocampus is a key area involved in neuroplasticity, behavior, and cognition, we hypothesize that stress-induced neuroinflammation impairs hippocampal neurogenesis and promotes cognitive and affective behavioral deficits. We show here that RSD caused transient impairments in spatial memory recall that resolved within 28 d. In assessment of neurogenesis, the number of proliferating neural progenitor cells (NPCs) and the number of young, developing neurons were not affected initially after RSD. Nonetheless, the neuronal differentiation of NPCs that proliferated during RSD was significantly impaired when examined 10 and 28 d later. In addition, social avoidance, a measure of depressive-like behavior associated with caudal hippocampal circuitry, persisted 28 d after RSD. Treatment with minocycline during RSD prevented both microglia activation and monocyte recruitment. Inhibition of this neuroinflammatory activation in turn prevented impairments in spatial memory after RSD but did not prevent deficits in neurogenesis nor did it prevent the persistence of social avoidance behavior. These findings show that neuroinflammatory activation after psychosocial stress impairs spatial memory performance independent of deficits in neurogenesis and social avoidance. SIGNIFICANCE STATEMENT Repeated exposure to stress alters the homeostatic environment of the brain, giving rise to various cognitive and mood disorders that impair everyday functioning and overall quality of life. The brain, previously thought of as an immune-privileged organ, is now known to communicate extensively with the peripheral immune system. This brain-body communication plays a significant role in various stress-induced inflammatory conditions, also characterized by psychological impairments. Findings from this study implicate neuroimmune activation rather than impaired neurogenesis in stress-induced cognitive deficits. This idea opens up possibilities for novel immune interventions in the treatment of cognitive and mood disturbances, while also adding to the complexity surrounding the functional implications of adult neurogenesis.
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96
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Wohleb ES, Franklin T, Iwata M, Duman RS. Integrating neuroimmune systems in the neurobiology of depression. Nat Rev Neurosci 2016; 17:497-511. [PMID: 27277867 DOI: 10.1038/nrn.2016.69] [Citation(s) in RCA: 414] [Impact Index Per Article: 51.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Data from clinical and preclinical studies indicate that immune dysregulation, specifically of inflammatory processes, is associated with symptoms of major depressive disorder (MDD). In particular, increased levels of circulating pro-inflammatory cytokines and concomitant activation of brain-resident microglia can lead to depressive behavioural symptoms. Repeated exposure to psychological stress has a profound impact on peripheral immune responses and perturbs the function of brain microglia, which may contribute to neurobiological changes underlying MDD. Here, we review these findings and discuss ongoing studies examining neuroimmune mechanisms that influence neuronal activity as well as synaptic plasticity. Interventions targeting immune-related cellular and molecular pathways may benefit subsets of MDD patients with immune dysregulation.
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Affiliation(s)
- Eric S Wohleb
- Departments of Psychiatry and Neurobiology, Yale University School of Medicine, New Haven, Connecticut 06519, USA
| | - Tina Franklin
- Departments of Psychiatry and Neurobiology, Yale University School of Medicine, New Haven, Connecticut 06519, USA
| | - Masaaki Iwata
- Division of Neuropsychiatry, Department of Brain and Neurosciences, Tottori University Faculty of Medicine, 86 Nishi-cho, Yonago, Tottori 683-8503, Japan
| | - Ronald S Duman
- Departments of Psychiatry and Neurobiology, Yale University School of Medicine, New Haven, Connecticut 06519, USA
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97
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Wang Z, Young MRI. PTSD, a Disorder with an Immunological Component. Front Immunol 2016; 7:219. [PMID: 27375619 PMCID: PMC4893499 DOI: 10.3389/fimmu.2016.00219] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 05/23/2016] [Indexed: 12/27/2022] Open
Abstract
Post-traumatic stress disorder (PTSD) has been associated with an inflammatory state. However, few studies have addressed the mechanisms underlying this immune imbalance that favors inflammation or how this imbalance contributes to PTSD. Whether the immune imbalance influences responsiveness or unresponsiveness of patients to PTSD treatments is currently not known. This review brings forward an immune emphasis to a mental health disorder that is unprecedented in its prevalence among combat Veterans of the ongoing conflicts in Iraq and Afghanistan and which also afflicts civilians who have undergone extreme traumatic experiences, such as following natural disasters, serious accidents, or assaults. Included is an overview of the correlative associations in human subjects between PTSD and inflammation and studies in animal models of PTSD, demonstrating causal contributions of inflammation and immune dysregulation to PTSD-like behavior following stress exposure.
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Affiliation(s)
- Zhewu Wang
- Mental Health Service, Ralph H. Johnson VA Medical Center, Charleston, SC, USA; Department of Psychiatry, Medical University of South Carolina, Charleston, SC, USA
| | - M Rita I Young
- Research Service, Ralph H. Johnson VA Medical Center, Charleston, SC, USA; Department of Otolaryngology - Head and Neck Surgery, Medical University of South Carolina, Charleston, SC, USA
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98
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Wang Z, Mandel H, Levingston CA, Young MRI. An exploratory approach demonstrating immune skewing and a loss of coordination among cytokines in plasma and saliva of Veterans with combat-related PTSD. Hum Immunol 2016; 77:652-657. [PMID: 27216157 PMCID: PMC5937020 DOI: 10.1016/j.humimm.2016.05.018] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 05/19/2016] [Accepted: 05/19/2016] [Indexed: 12/16/2022]
Abstract
Studies have suggested PTSD to be associated with an inflammatory state, although few studies have examined the balances between stimulatory and inhibitory immune mediators in PTSD. An exploratory approach was taken to assess the immune imbalances between Th1 stimulatory, inflammatory and inhibitory mediators associated with PTSD. This approach focused on a tightly-controlled and relatively homogeneous population of Veterans, all with similar levels of combat exposure in the Afghanistan and Iraq wars, but some testing negative and others testing positive for PTSD. Although the sample size was small (6 controls and 7 with PTSD) and a limitation of this study, the results showed significant imbalances in immune cytokines favoring a Th1 and inflammatory state, with reduced levels of inhibitory cytokines in Veterans with PTSD. This was particularly prominent in the saliva of PTSD subjects compared to in their plasma.
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Affiliation(s)
- Zhewu Wang
- Ralph H. Johnson VA Medical Center, Charleston, SC, United States; Medical University of South Carolina, Charleston, SC, United States
| | - Howard Mandel
- Ralph H. Johnson VA Medical Center, Charleston, SC, United States
| | | | - M Rita I Young
- Ralph H. Johnson VA Medical Center, Charleston, SC, United States; Medical University of South Carolina, Charleston, SC, United States.
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99
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Lisboa SF, Gomes FV, Guimaraes FS, Campos AC. Microglial Cells as a Link between Cannabinoids and the Immune Hypothesis of Psychiatric Disorders. Front Neurol 2016; 7:5. [PMID: 26858686 PMCID: PMC4729885 DOI: 10.3389/fneur.2016.00005] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/14/2016] [Indexed: 12/12/2022] Open
Abstract
Psychiatric disorders are one of the leading causes of disability worldwide. Although several therapeutic options are available, the exact mechanisms responsible for the genesis of these disorders remain to be fully elucidated. In the last decade, a body of evidence has supported the involvement of the immune system in the pathophysiology of these conditions. Microglial cells play a significant role in maintaining brain homeostasis and surveillance. Dysregulation of microglial functions has been associated with several psychiatric conditions. Cannabinoids regulate the brain–immune axis and inhibit microglial cell activation. Here, we summarized evidence supporting the hypothesis that microglial cells could be a target for cannabinoid influence on psychiatric disorders, such as anxiety, depression, schizophrenia, and stress-related disorders.
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Affiliation(s)
- Sabrina F Lisboa
- Department of Pharmacology, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; Center of Interdisciplinary Research on Applied Neurosciences (NAPNA), University of São Paulo, Ribeirão Preto, Brazil
| | - Felipe V Gomes
- Department of Neuroscience, University of Pittsburgh , Pittsburgh, PA , USA
| | - Francisco S Guimaraes
- Department of Pharmacology, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; Center of Interdisciplinary Research on Applied Neurosciences (NAPNA), University of São Paulo, Ribeirão Preto, Brazil
| | - Alline C Campos
- Department of Pharmacology, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; Center of Interdisciplinary Research on Applied Neurosciences (NAPNA), University of São Paulo, Ribeirão Preto, Brazil
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100
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Chemical dampening of Ly6C(hi) monocytes in the periphery produces anti-depressant effects in mice. Sci Rep 2016; 6:19406. [PMID: 26783261 PMCID: PMC4725984 DOI: 10.1038/srep19406] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Accepted: 12/14/2015] [Indexed: 01/09/2023] Open
Abstract
The involvement of systemic immunity in depression pathogenesis promises a periphery-targeting paradigm in novel anti-depressant discovery. However, relatively little is known about druggable targets in the periphery for mental and behavioral control. Here we report that targeting Ly6Chi monocytes in blood can serve as a strategy for anti-depressant purpose. A natural compound, ginsenoside Rg1 (Rg1), was firstly validated as a periphery-restricted chemical probe. Rg1 selectively suppressed Ly6Chi monocytes recruitment to the inflamed mice brain. The proinflammatory potential of Ly6Chi monocytes to activate astrocytes was abrogated by Rg1, which led to a blunted feedback release of CCL2 to recruit the peripheral monocytes. In vitro study demonstrated that Rg1 pretreatment on activated THP-1 monocytes retarded their ability to trigger CCL2 secretion from co-cultured U251 MG astrocytes. CCL2-triggered p38/MAPK and PI3K/Akt activation were involved in the action of Rg1. Importantly, in mice models, we found that dampening Ly6Chi monocytes at the periphery ameliorated depression-like behavior induced by neuroinflammation or chronic social defeat stress. Together, our work unravels that blood Ly6Chi monocytes may serve as the target to enable remote intervention on the depressed brain, and identifies Rg1 as a lead compound for designing drugs targeting peripheral CCL2 signals.
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