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    Is depression the result of immune system abnormalities?

    2017-11-29 03:44:38XiaoyunGUOKaidaJIANG
    上海精神醫(yī)學(xué) 2017年3期
    關(guān)鍵詞:輔助性抗炎綜述

    Xiaoyun GUO, Kaida JIANG*

    ?Forum?

    Is depression the result of immune system abnormalities?

    Xiaoyun GUO, Kaida JIANG*

    major depressive disorder; cytokines; neuroimmunology; China

    Major Depressive Disorder (MDD) is characterized by serious mental impairment, which endangers a person’s overall health. MDD has high morbidity, high recurrence rate, high disability rate, high suicide rate and a heavy economic burden. It is reported that the lifetime prevalence of MDD ranges from 10% to 20%,annual prevalence rate from 2% to 5%, and suicide rate from 15% to 20%.[1,2]The economic burden of MDD is not only on those individuals, but also their family and community. According to the Global Burden of Disease Study conducted by the World Health Organization(WHO) in 2003, MDD had already become the world's number two most disabling disease.[3]In 2014 it became the number one disabling disease when Nature reported that 350 million people in the world were diagnosed with MDD. Currently, the disease burden is up to 10.3% (the highest of all ten major diseases).[4]Although the etiology of MDD is currently unclear,numerous studies have indicated that the imbalance of neurotransmitters and receptors, especially those in monoamines signaling pathways, are involved in both the etiology of MDD and the pharmacological mechanism of antidepressants.[5]Despite this, the current findings for MDD are still insufficient to establish a reliable theory that could explain the etiology of MDD. Indeed, further exploration of both the etiological mechanism and potential treatment for MDD is still a key priority for modern psychiatry.

    Immune response (Immune Response, IR) is the physiological process induced by the body’s immune system. This process is the body’s reaction to the stimulation of exogenous antigens, which can eventually be eliminated. IR is divided into two parts:innate immunity and adaptive immunity. Adaptive immunity is also called specific immunity, which is further divided into cellular immunity and humoral immunity. Cellular immunity is mainly accomplished by CD4+ T cells and B cells to produce antibodies and cytokines, to recruit mononuclear macrophages, and to activate other lymphocytes. CD8+ T cells can kill virus infected cells directly. Humoral immunity is mainly accomplished by B cells, including the process of antigen recognition and antibody production. In recent years, the focus of immunological research on MDD is on cellular immunity, especially on cytokines. These studies suggest that inflammatory cytokines can lead to the pathological behavior in depressive disorder.[5]In addition, immunization and inflammation were found to be closely related to the pathogenesis of MDD and patients’ treatment response to antidepressants.Depressive disorder showed an increased systemic inflammation reaction, and serum inflammatory biomarkers were associated with a poor prognosis for MDD.[6]By reducing serum concentration of various inflammatory cytokines, and by affecting immune functioning in both cerebral tissues and peripheral serum, antidepressants could improve the physical,affective, cognitive and behavioral symptoms effectively.Antidepressants are able to reduce inflammatory activity by influencing the neuroendocrine and neurotransmitter systems as well.

    Recent studies found a close correlation between the specific area in the brain and various inflammatory cytokines in the serum. Felger and colleagues’[7]recruited 48 non-medicated MDD or Bipolar Disorder(BP) patients with a current depressive episode.They found increased C-reactive protein (CRP) was associated with decreased connectivity between ventral striatum and ventromedial prefrontal cortex (vmPFC),which in turn correlated with increased anhedonia.Increased CRP similarly predicted decreased dorsal striatal to vmPFC and presupplementary motor area connectivity, which correlated with decreased motor speed and increased psychomotor slowing. In addition,increased serum concentration of interleukin-6 (IL-6), interleukin-1β (IL-1β) and IL-1 antagonist were negatively correlated with cortico-striatal connections.All of the findings listed above indicate that the corticostriatal circuit could be a target for anti-inflammatory treatment, which potentially could be an effective treatment for MDD patients with reduced motivation and movement in particular.

    In addition, various methods that target the inflammatory pathway could be considered as possible effective treatment approaches for MDD. These methods include cytokine antagonists, omega-3 polyunsaturated fatty acid,[8]celecoxib[9] (one of NSAIDs)and physical exercise.[10]Especially in situations when inflammation is prominent in MDD patients, the combined administration of antidepressant and antiinflammatory drugs could be effective in improving the therapeutic effect and reducing the risk of recurrence.[11]An 8-weeks randomized double-blind controlled study recruited 30 female MDD outpatients to test the treatment effect of sertraline plus celecoxib 100 mg twice daily or sertraline plus placebo. They used Hamilton Depressive and Anxiety Scales (HAMD and HAMA) at baseline, fourth week and eighth week to evaluate the symptoms. Results showed that the efficacy of sertraline plus celecoxib was observed earlier than controls, and both the efficacy rate and remission rate were greater than in the control group.[9]

    In ancient times, inflammation was a major cause of death. The symptoms of depression such as fatigue,lack of activity, social avoidance and loss of appetite could be considered as adaptive behaviors related with inflammation.[12]The insomnia in depression could also be regarded as the initial need of being awakened in order to defend oneself against natural enemies. There are many interesting new branches in the research of the etiology and treatment of MDD,including study of the efficacy of anti-inflammatory drugs in MDD treatment. The inflammation theory of depression appeared as early as in the 1950s, however,the debate surrounding it is still ongoing. The latest research on the brain imaging, pharmacology and pharmacodynamics of MDD has given us many new clues, such as how important the role of inflammation is in the etiology of MDD. All of the above has enriched our ideas about the pathology of MDD. There is one theory that focused on the regulatory effect of the hypothalamicpituitary-adrenal axis (HPA) and sympathetic nervous system (SNS) on the human immune system. In trauma,infection and stress, the HPA and SNS activate and release inflammatory compounds, which probably affect the central nervous system via three pathways: (a) the neurological pathway via the Vigus nerve, (b) the humoral pathway, (c) the pathway of activating astrocytes in the central nervous system (CNS) and promoting the release of Monocyte Chemotactic and Activating Factor (MCP),which causes mononuclear cells to migrate into the CNS directly. Effects of inflammatory cytokines on CNS include the reduction of monoamine synthesis, which in turn increases monoamine synaptic membrane reuptake and its neurotoxic effect. These effects cause depressive symptoms such as loss of interest, melancholia, anxiety and other mental conditions. Accumulating evidence suggests trauma can lead to activation of the immune system, which could cause depression. In summary, the inflammatory process and neuroendocrine, neurotrophic,nerve regeneration, monoamine neurotransmitter synthesis transport and release process may have a wide range of interactions. Further understanding of the inflammatory process of MDD may provide a breakthrough for the etiology and pathogenesis research of MDD.

    Funding statement

    This study is funded by the National Natural Science Foundation of China (81201057), Shanghai Municipal Health Bureau Project (20124109), Chinese Medical Association, Psychiatry – Servier Youth Research Fund, Shanghai Mental Health Center international cooperation project (2013- ) and Shanghai Municipal Center for Mental Health Clinical Research Program.

    Conflict of interest statement

    The authors declare no conflict of interest.

    Authors’ contributions

    Xiaoyun Guo wrote the article, Kaida Jiang reviewed and revised this article.

    1. Kessler RC, Berglund P, Demler O, Jin R, Koretz D,Merikangas KR, et al. The epidemiology of major depressive disorder: results from the National Comorbidity Survey Replication (NCS-R). JAMA. 2003; 289(23): 3095-3105. doi:http://doi.org/10.1001/jama.289.23.3095

    2.Kessler RC, Avenevoli S, Costello J, Green JG, Gruber MJ,McLaughlin KA, et al. Severity of 12-month DSM-IV disorders in the National Comorbidity Survey Replication Adolescent Supplement. Arch Gen Psychiatry. 2012; 69(4):381-389. doi:http://doi.org/10.1001/archgenpsychiatry.2011.1603

    3.Global Burden of Disease Study C. Global, regional, and national incidence, prevalence, and years lived with disability for 301 acute and chronic diseases and injuries in 188 countries, 1990-2013: A systematic analysis for the Global Burden of Disease Study 2013. Lancet. 2015; 386(9995):743-800. doi: http://doi.org/10.1016/S0140-6736(15)60692-4

    4. Smith K. Mental health: A world of depression. Nature.2014; 515(7526): 181. doi: http://doi.org/10.1038/515180a

    5. Rominger A, Cumming P, Brendel M, Xiong G, Zach C,Karch S, et al. Altered serotonin and dopamine transporter availabilities in brain of depressed patients upon treatment with escitalopram: A [123 I]beta-CIT SPECT study. Eur Neuropsychopharmacol. 2015; 6: 873-881

    6. Schmidt HD, Shelton RC, Duman RS. Functional biomarkers of depression: diagnosis, treatment, and pathophysiology.Neuropsychopharmacology. 2011; 36(12): 2375-2394. doi:http://doi.org/10.1038/npp.2011.151

    7. Felger JC, Li Z, Haroon E, Woolwine BJ, Jung MY, Hu X, et al. Inflammation is associated with decreased functional connectivity within corticostriatal reward circuitry in depression. Mol Psychiatry. 2016; 21(10): 1358-1365. doi:http://doi.org/10.1038/mp.2015.168

    8. Shi Z, Ren H, Huang Z, Peng Y, He B, Yao X, et al. Fish oil prevents lipopolysaccharide-induced depressive-like behavior by inhibiting neuroinflammation. Mol Neurobiol.2016; Epub ahead of print. doi: http://doi.org/10.1007/s12035-016-0212-9

    9. Majd M, Hashemian F, Hosseini SM, Vahdat Shariatpanahi M,Sharifi A. A Randomized, Double-blind, Placebo-controlled Trial of Celecoxib Augmentation of Sertraline in Treatment of Drug-naive Depressed Women: A Pilot Study. Iran J Pharm Res. 2015; 14(3): 891-899

    10. Radovic S, Gordon MS, Melvin GA. Should we recommend exercise to adolescents with depressive symptoms? A metaanalysis. J Paediatr Child Health. 2017; 53(3): 214-220. doi:http://doi.org/10.1111/jpc.13426

    11. Kiecolt-Glaser JK, Derry HM, Fagundes CP. Inflammation:depression fans the flames and feasts on the heat. Am J Psychiatry. 2015; 172(11): 1075-1091. doi: http://doi.org/10.1176/appi.ajp.2015.15020152

    12. Raison CL, Miller AH. The evolutionary significance of depression in Pathogen Host Defense (PATHOS-D). Mol Psychiatry. 2013; 18(1):15-37. doi: http://doi.org/10.1038/mp.2012.2

    抑郁障礙——免疫異常的結(jié)果?

    郭曉云 江開達(dá)

    抑郁障礙,細(xì)胞因子,神經(jīng)免疫

    Summary: The etiology of Major Depressive Disorder (MDD) is still unclear. We reviewed the literature for the relationship between inflammatory signaling and cytokines in the pathogenesis of MDD. In addition,we provid evidence for adjunctive treatment using anti-inflammatory drugs to improve the therapeutic effect and prognosis. Finally, we explore the possible relationship between the pathogenesis of MDD and immune disturbances.

    [Shanghai Arch Psychiatry. 2017; 29(3): 171-173.

    http://dx.doi.org/10.11919/j.issn.1002-0829.217015]

    Shanghai Mental Health Center, Shanghai Jiao Tong University, Shanghai, China

    *correspondence: Professor Kaida Jiang. Mailing address: South Wanping RD, Shanghai, China. Postcode: 200030. E-mail: kaidajiang@aliyun.com

    概述:抑郁障礙病因仍不清楚。本文綜述了相關(guān)文獻(xiàn),提供了炎癥信號(hào)和細(xì)胞因子在抑郁障礙的發(fā)病機(jī)制中的作用、及抗炎機(jī)制藥物的輔助性治療對(duì)提高抑郁癥治療療效、改善預(yù)后的證據(jù),并進(jìn)一步探討了抑郁障礙發(fā)病機(jī)制與免疫異常的可能聯(lián)系。

    Dr. Xiaoyun Guo obtained a Degree of Medicine in 2001, a Master’s Degree in Psychiatry in 2004,and a PhD in Psychiatry (Fudan University) in 2007. She has been working at Shanghai Mental Health Center since 2007, where she is currently an associate chief physician. She is also a former faculty and Associate Research Scientist at the Department of Cellular and Molecular Physiology,Yale University School of Medicine; and the General Secretary of the Chinese Association for Science and Technology in Connecticut. Her research interest focuses on the genetic and immunological mechanism of depression and bipolar disorders.

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