1
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Kanbay M, Tanriover C, Copur S, Peltek IB, Mutlu A, Mallamaci F, Zoccali C. Social isolation and loneliness: Undervalued risk factors for disease states and mortality. Eur J Clin Invest 2023; 53:e14032. [PMID: 37218451 DOI: 10.1111/eci.14032] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 05/07/2023] [Accepted: 05/12/2023] [Indexed: 05/24/2023]
Abstract
Social isolation and loneliness are two common but undervalued conditions associated with a poor quality of life, decreased overall health and mortality. In this review, we aim to discuss the health consequences of social isolation and loneliness. We first provide the potential causes of these two conditions. Then, we explain the pathophysiological processes underlying the effects of social isolation and loneliness in disease states. Afterwards, we explain the important associations between these conditions and different non-communicable diseases, as well as the impact of social isolation and loneliness on health-related behaviours. Finally, we discuss the current and novel potential management strategies for these conditions. Healthcare professionals who attend to socially isolated and/or lonely patients should be fully competent in these conditions and assess their patients thoroughly to detect and properly understand the effects of isolation and loneliness. Patients should be offered education and treatment alternatives through shared decision-making. Future studies are needed to understand the underlying mechanisms better and to improve the treatment strategies for both social isolation and loneliness.
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Affiliation(s)
- Mehmet Kanbay
- Department of Medicine, Division of Nephrology, Koc University School of Medicine, Istanbul, Turkey
| | - Cem Tanriover
- Department of Medicine, Koc University School of Medicine, Istanbul, Turkey
| | - Sidar Copur
- Department of Medicine, Koc University School of Medicine, Istanbul, Turkey
| | - Ibrahim B Peltek
- Department of Medicine, Koc University School of Medicine, Istanbul, Turkey
| | - Ali Mutlu
- Department of Medicine, Koc University School of Medicine, Istanbul, Turkey
| | - Francesca Mallamaci
- Nephrology, Dialysis and Transplantation Unit Azienda Ospedaliera "Bianchi-Melacrino-Morelli" & CNR-IFC, Institute of Clinical Physiology, Research Unit of Clinical Epidemiology and Physiopathology of Renal Diseases and Hypertension of Reggio Calabria, Reggio Calabria, Italy
| | - Carmine Zoccali
- Renal Research Institute, New York City, New York, USA
- Institute of Molecular Biology and Genetics (Biogem), Ariano Irpino, Italy and Associazione Ipertensione Nefrologia Trapianto Renal (IPNET), c/o Nefrologia, Grande Ospedale Metropolitano, Reggio Calabria, Italy
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2
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Slavich GM, Mengelkoch S, Cole SW. Human social genomics: Concepts, mechanisms, and implications for health. LIFESTYLE MEDICINE 2023. [DOI: 10.1002/lim2.75] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023] Open
Affiliation(s)
- George M. Slavich
- Department of Psychiatry and Biobehavioral Sciences University of California Los Angeles California USA
| | - Summer Mengelkoch
- Department of Psychiatry and Biobehavioral Sciences University of California Los Angeles California USA
| | - Steven W. Cole
- Department of Psychiatry and Biobehavioral Sciences University of California Los Angeles California USA
- Department of Medicine University of California Los Angeles California USA
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3
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Yan J, Chen Y, Luo M, Hu X, Li H, Liu Q, Zou Z. Chronic stress in solid tumor development: from mechanisms to interventions. J Biomed Sci 2023; 30:8. [PMID: 36707854 PMCID: PMC9883141 DOI: 10.1186/s12929-023-00903-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 01/17/2023] [Indexed: 01/29/2023] Open
Abstract
Chronic stress results in disturbances of body hormones through the neuroendocrine system. Cancer patients often experience recurrent anxiety and restlessness during disease progression and treatment, which aggravates disease progression and hinders treatment effects. Recent studies have shown that chronic stress-regulated neuroendocrine systems secret hormones to activate many signaling pathways related to tumor development in tumor cells. The activated neuroendocrine system acts not only on tumor cells but also modulates the survival and metabolic changes of surrounding non-cancerous cells. Current clinical evidences also suggest that chronic stress affects the outcome of cancer treatment. However, in clinic, there is lack of effective treatment for chronic stress in cancer patients. In this review, we discuss the main mechanisms by which chronic stress regulates the tumor microenvironment, including functional regulation of tumor cells by stress hormones (stem cell-like properties, metastasis, angiogenesis, DNA damage accumulation, and apoptotic resistance), metabolic reprogramming and immune escape, and peritumor neuromodulation. Based on the current clinical treatment framework for cancer and chronic stress, we also summarize pharmacological and non-pharmacological therapeutic approaches to provide some directions for cancer therapy.
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Affiliation(s)
- Jiajing Yan
- grid.263785.d0000 0004 0368 7397MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631 China
| | - Yibing Chen
- grid.207374.50000 0001 2189 3846Department of Gynecology and Obstetrics, First Affiliated Hospital, Genetic and Prenatal Diagnosis Center, Zhengzhou University, Zhengzhou, 450001 China
| | - Minhua Luo
- grid.263785.d0000 0004 0368 7397MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631 China
| | - Xinyu Hu
- grid.263785.d0000 0004 0368 7397MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631 China
| | - Hongsheng Li
- grid.410737.60000 0000 8653 1072Department of Breast Surgery, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, 510095 China
| | - Quentin Liu
- grid.488530.20000 0004 1803 6191State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-Sen University Cancer Center, Guangzhou, 510631 China ,grid.411971.b0000 0000 9558 1426Institute of Cancer Stem Cell, Dalian Medical University, Dalian, 116044 Liaoning China
| | - Zhengzhi Zou
- grid.263785.d0000 0004 0368 7397MOE Key Laboratory of Laser Life Science & Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, 510631 China ,grid.263785.d0000 0004 0368 7397Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou, 510631 China
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4
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Hinkle L, Liu Y, Meng C, Chen Z, Mai J, Zhang L, Xu Y, Pan PY, Chen SH, Shen H. The Sympathetic Nervous System Modulates Cancer Vaccine Activity through Monocyte-Derived Cells. THE JOURNAL OF IMMUNOLOGY 2021; 207:3131-3140. [PMID: 34772699 DOI: 10.4049/jimmunol.2100719] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 10/05/2021] [Indexed: 11/19/2022]
Abstract
The sympathetic nervous system (SNS) is an important regulator of immune cell function during homeostasis and states of inflammation. Recently, the SNS has been found to bolster tumor growth and impair the development of antitumor immunity. However, it is unclear whether the SNS can modulate APC function. Here, we investigated the effects of SNS signaling in murine monocyte-derived macrophages (moMФ) and dendritic cells (DCs) and further combined the nonspecific β-blocker propranolol with a peptide cancer vaccine for the treatment of melanoma in mice. We report that norepinephrine treatment dramatically altered moMФ cytokine production, whereas DCs were unresponsive to norepinephrine and critically lack β2-adrenergic receptor expression. In addition, we show that propranolol plus cancer vaccine enhanced peripheral DC maturation, increased the intratumor proportion of effector CD8+ T cells, and decreased the presence of intratumor PD-L1+ myeloid-derived suppressor cells. Furthermore, this combination dramatically reduced tumor growth compared with vaccination alone. Taken together, these results offer insights into the cell-specific manner by which the SNS regulates the APC immune compartment and provide strong support for the use of propranolol in combination with cancer vaccines to improve patient response rates and survival.
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Affiliation(s)
- Louis Hinkle
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX.,Texas A&M Health Science Center, Bryan, TX
| | - Yongbin Liu
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX
| | - Chaoyang Meng
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX.,Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Zhe Chen
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX.,Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Junhua Mai
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX
| | - Licheng Zhang
- Center for Cancer Immunotherapy, Houston Methodist Research Institute, Houston, TX; and
| | - Yitian Xu
- Center for Cancer Immunotherapy, Houston Methodist Research Institute, Houston, TX; and
| | - Ping-Ying Pan
- Center for Cancer Immunotherapy, Houston Methodist Research Institute, Houston, TX; and.,Weill Cornell Medical College, New York, NY
| | - Shu-Hsia Chen
- Center for Cancer Immunotherapy, Houston Methodist Research Institute, Houston, TX; and.,Weill Cornell Medical College, New York, NY
| | - Haifa Shen
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX; .,Weill Cornell Medical College, New York, NY
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5
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GFAP and desmin expression in lymphatic tissues leads to difficulties in distinguishing between glial and stromal cells. Sci Rep 2021; 11:13322. [PMID: 34172765 PMCID: PMC8233388 DOI: 10.1038/s41598-021-92364-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 06/07/2021] [Indexed: 11/12/2022] Open
Abstract
Recently, we found many immune cells including antigen presenting cells neurally hard wired in the T-cell zone of most lymphoid organs like amongst others, lymph nodes in rats, mice and humans. Single immune cells were reached by single neurites and enclosed with a dense neural meshwork. As it is well known that axons are always accompanied by glial cells, we were able to identify Schwann cells in the hilum, medullary and capsule region, like expected. Unexpected was the result, that we found oligodendrocyte-like cells in these regions, myelinating more than one axon. Likewise important was the finding, that one of the standard glial markers used, a polyclonal GFAP antibody equally bound to desmin and therefore marked nearly all stromal cells in cortical, paracortical and medullary cord regions. More detailed analysis showed that these results also appeared in many other non-lymphoid organs. Therefore, polyclonal GFAP antibodies are only conditionally usable for immunohistochemical analysis in peripheral tissues outside the central nervous system. It remains to be elucidated, if the binding of the GFAP antibody to desmin has its reason in a special desmin variant that can give stromal cells glial character.
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6
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McMahon EK, Cavigelli SA. Gaps to Address in Ecological Studies of Temperament and Physiology. Integr Comp Biol 2021; 61:1917-1932. [PMID: 34097030 DOI: 10.1093/icb/icab118] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Ecology is a diverse field with many researchers interested in drivers and consequences of variability within populations. Two aspects of variability that have been addressed are behavioral and physiological. While these have been shown to separately influence ecological outcomes such as survival, reproductive success and fitness, combined they could better predict within-population variability in survival and fitness. Recently there has been a focus on potential fitness outcomes of consistent behavioral traits that are referred to as personality or temperament (e.g. boldness, sociability, exploration, etc.). Given this recent focus, it is an optimal time to identify areas to supplement in this field, particularly in determining the relationship between temperament and physiological traits. To maximize progress, in this perspective paper we propose that the following two areas be addressed: (1) increased diversity of species, and (2) increased number of physiological processes studied, with an eye toward using more representative and relatively consistent measures across studies. We first highlight information that has been gleaned from species that are frequently studied to determine how animal personality relates to physiology and/or survival/fitness. We then shine a spotlight on important taxa that have been understudied and that can contribute meaningful, complementary information to this area of research. And last, we propose a brief array of physiological processes to relate to temperament, and that can significantly impact fitness, and that may be accessible in field studies.
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Affiliation(s)
- Elyse K McMahon
- Ecology Graduate Program, Pennsylvania State University, University Park, PA 16802, USA.,Center for Brain, Behavior, and Cognition, Pennsylvania State University, University Park, PA 16802, USA.,Department of Biobehavioral Health, Pennsylvania State University, University Park, PA 16802, USA
| | - Sonia A Cavigelli
- Center for Brain, Behavior, and Cognition, Pennsylvania State University, University Park, PA 16802, USA.,Department of Biobehavioral Health, Pennsylvania State University, University Park, PA 16802, USA
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7
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Colditz IG. Adrenergic Tone as an Intermediary in the Temperament Syndrome Associated With Flight Speed in Beef Cattle. FRONTIERS IN ANIMAL SCIENCE 2021. [DOI: 10.3389/fanim.2021.652306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The temperament of farm animals can influence their resilience to everyday variations within the managed production environment and has been under strong direct and indirect selection during the course of domestication. A prominent objective measure used for assessing temperament in beef cattle is the behavioral flight response to release from confinement in a crush or chute. This behavioral measure, termed flight speed (also known as escape velocity) is associated with physiological processes including body temperature, feeding behavior, growth rate, carcass composition, immune function, and health outcomes. This review examines the functional links between this suite of traits and adrenergic activity of the sympathetic nervous system and the adrenomedullary hormonal system. It is suggested that flight speed is the behavioral aspect of an underlying “flightiness” temperament syndrome, and that elevated adrenergic tone in animals with a high level of flightiness (i.e., flighty animals) tunes physiological activities toward a sustained “fight or flight” defense profile that reduces productivity and the capacity to flourish within the production environment. Nonetheless, despite a common influence of adrenergic tone on this suite of traits, variation in each trait is also influenced by other regulatory pathways and by the capacity of tissues to respond to a range of modulators in addition to adrenergic stimuli. It is suggested that tuning by adrenergic tone is an example of homeorhetic regulation that can help account for the persistent expression of behavioral and somatic traits associated with the flight speed temperament syndrome across the life of the animal. At a population level, temperament may modulate ecological fit within and across generations in the face of environmental variability and change. Associations of flight speed with the psychological affective state of the animal, and implications for welfare are also considered. The review will help advance understanding of the developmental biology and physiological regulation of temperament syndromes.
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8
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Lim GN, Regan SL, Ross AE. Subsecond spontaneous catecholamine release in mesenteric lymph node ex vivo. J Neurochem 2020; 155:417-429. [DOI: 10.1111/jnc.15115] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 05/14/2020] [Accepted: 06/15/2020] [Indexed: 12/25/2022]
Affiliation(s)
- Gary N. Lim
- Department of Chemistry University of Cincinnati Cincinnati OH USA
| | - Samantha L. Regan
- Department of Pediatrics University of CincinnatiCollege of Medicine and Division of NeurologyCincinnati Children’s Research Foundation Cincinnati OH USA
- Neuroscience Graduate Program University of Cincinnati Cincinnati OH USA
| | - Ashley E. Ross
- Department of Chemistry University of Cincinnati Cincinnati OH USA
- Neuroscience Graduate Program University of Cincinnati Cincinnati OH USA
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9
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Michael KC, Bonneau RH, Bourne RA, Godbolt L, Caruso MJ, Hohmann C, Cavigelli SA. Divergent immune responses in behaviorally-inhibited vs. non-inhibited male rats. Physiol Behav 2019; 213:112693. [PMID: 31629765 PMCID: PMC6934092 DOI: 10.1016/j.physbeh.2019.112693] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 09/17/2019] [Accepted: 09/27/2019] [Indexed: 02/06/2023]
Abstract
Stable behavioral traits (temperament, personality) often predict health outcomes. Temperament-specific differences in immune function could explain temperament-specific health outcomes, however, we have limited information on whether immune function varies by personality. In the present study, we examined the relationship between a basic behavioral trait (behavioral-inhibition vs. non-inhibition) and two immune responses (innate inflammation and delayed-type hypersensitivity, DTH) in a rodent model. In humans, behavioral inhibition (fearful temperament) is associated with altered stress physiology and allergies. In laboratory rats, the trait is associated with elevated glucocorticoid production. We hypothesized that behavioral inhibition is associated with glucocorticoid resistance and dampened T-helper 1 cell responses often associated with chronic stress and allergies. Further, this immune profile would predict poorly-regulated innate inflammation and dampened DTH. In male Sprague-Dawley rats, we quantified consistent behavioral phenotypes by measuring latency to contact two kinds of novelty (object vs. social), then measured lipopolysaccharide(LPS)-induced innate inflammation or keyhole limpet hemocyanin(KLH)-induced DTH. Behaviorally-inhibited rats had heightened glucocorticoid and interleukin-6 responses to a low/moderate dose of LPS and reduced DTH swelling to KLH re-exposure compared to non-inhibited rats. These results suggest that behavioral inhibition is associated with a glucocorticoid resistant state with poorly regulated innate inflammation and dampened cell-mediated immune responses. This immune profile may be associated with exaggerated T-helper 2 responses, which could set the stage for an allergic/asthmatic/atopic predisposition in inhibited individuals. Human and animal models of temperament-specific immune responses represent an area for further exploration of mechanisms involved in individual differences in health.
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Affiliation(s)
- Kerry C Michael
- Department of Psychology, University of Minnesota, Morris, USA
| | - Robert H Bonneau
- Department of Microbiology and Immunology and Department of Pediatrics, The Pennsylvania State University Hershey Medical Center, USA
| | - Rebecca A Bourne
- Department of Biobehavioral Health, The Pennsylvania State University, USA
| | | | - Michael J Caruso
- Department of Biobehavioral Health, The Pennsylvania State University, USA; Center for Brain, Behavior, and Cognition, The Pennsylvania State University, USA
| | | | - Sonia A Cavigelli
- Department of Biobehavioral Health, The Pennsylvania State University, USA; Center for Brain, Behavior, and Cognition, The Pennsylvania State University, USA; Huck Institutes of the Life Sciences, The Pennsylvania State University, USA.
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10
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Gottlieb DH, Del Rosso L, Sheikhi F, Gottlieb A, McCowan B, Capitanio JP. Personality, environmental stressors, and diarrhea in Rhesus macaques: An interactionist perspective. Am J Primatol 2018; 80:e22908. [PMID: 30152539 PMCID: PMC6705421 DOI: 10.1002/ajp.22908] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 06/14/2018] [Accepted: 06/21/2018] [Indexed: 11/09/2022]
Abstract
Previous research has repeatedly shown both personality and psychological stress to predict gastrointestinal disorders and chronic diarrhea in humans. The goal of the present research was to evaluate the role of personality, as well as psychological stressors (i.e., housing relocations and rearing environment), in predicting chronic diarrhea in captive Rhesus macaques, with particular attention to how personality regulated the impact of such stressors. Subjects were 1,930 R. macaques at the California National Primate Research Center reared in a variety of environments. All subjects took part in an extensive personality evaluation at approximately 90-120 days of age. Data were analyzed using generalized linear models to determine how personality, rearing condition, housing relocations, and personality by environment interactions, predicted both diarrhea risk (an animal's risk for having diarrhea at least once) and chronic diarrhea (how many repeated bouts of diarrhea an animal had after their initial bout). Much like the human literature, we found that certain personality types (i.e., nervous, gentle, vigilant, and not confident) were more likely to have chronic diarrhea, and that certain stressful environments (i.e., repeated housing relocations) increased diarrhea risk. We further found multiple interactions between personality and environment, supporting the "interactionist" perspective on personality and health. We conclude that while certain stressful environments increase risk for chronic diarrhea, the relative impact of these stressors is highly dependent on an animal's personality.
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Affiliation(s)
- Daniel H Gottlieb
- Oregon National Primate Research Center, Oregon Health Sciences University, Beaverton, Oregon
- California National Primate Research Center, University of California Davis, Davis, California
| | - Laura Del Rosso
- California National Primate Research Center, University of California Davis, Davis, California
| | | | - Andrea Gottlieb
- San Jose University, Department of Mathematics and Statistics, San Jose California
| | - Brenda McCowan
- Population Health & Reproduction, School of Veterinary Medicine, University of California Davis, Davis, California
| | - John P. Capitanio
- California National Primate Research Center, University of California Davis, Davis, California
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11
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Capitanio JP. Naturally Occurring Nonhuman Primate Models of Psychosocial Processes. ILAR J 2018; 58:226-234. [PMID: 28472500 DOI: 10.1093/ilar/ilx012] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Accepted: 03/25/2017] [Indexed: 12/24/2022] Open
Abstract
Human research into psychological processes such as anxiety, depression, or loneliness typically involves accruing cases in which the phenomenon of interest is naturally occurring, and then comparing such a sample with control cases. In contrast, animal research designed to model similar processes to test mechanistic hypotheses typically involves inducing the phenomenon of interest via some exogenously (i.e., human) administered procedure. In the present review, the author proposes that naturally occurring animal models can complement induced models in understanding complex psychological phenomena. Advantages and disadvantages of naturally occurring versus induced models are described, and detailed examples of three naturally occurring models-for loneliness and health, behavioral inhibition and asthma, and social functioning and autism-are described, along with a formal program (the BioBehavioral Assessment program) at the California National Primate Research Center, that is designed to quantify variation in biobehavioral processes in infant rhesus macaques to facilitate development of naturally occurring models. It is argued that, because of the similarity in complex behavioral and psychological processes between macaques and humans, naturally occurring primate models provide a bridge between human studies and induced primate models and have the potential to identify new models for translational research.
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Affiliation(s)
- John P Capitanio
- Department of Psychology, University of California, Davis, California.,California National Primate Research Center, University of California, Davis, California
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12
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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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13
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Coleman K, Novak MA. Environmental Enrichment in the 21st Century. ILAR J 2017; 58:295-307. [PMID: 28444189 PMCID: PMC6279160 DOI: 10.1093/ilar/ilx008] [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: 10/06/2016] [Revised: 02/08/2017] [Accepted: 02/23/2017] [Indexed: 01/13/2023] Open
Abstract
More than a quarter of a century has elapsed since the Animal Welfare Act mandated that research facilities develop and follow a plan to promote the psychological well-being of captive primates. Since passage of this law, considerable effort and resources have been directed to designing environmental enrichment strategies in an effort to improve animal welfare. These plans typically consist of environmental enrichment and socialization efforts. While environmental enhancement has undergone a great deal of improvement in the past 25 years, it should be viewed as a continual work in progress, which takes advantage of emergent and future technologies. In this review, we discuss the objectives of the environmental enhancement plan along with relevant outcome measures, as well as ongoing challenges, costs, and benefits. We then review various enrichment strategies and assess their efficacy in meeting goals and objectives. Finally, we look forward to consider what the future might hold for environmental enrichment of nonhuman primates used in research.
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Affiliation(s)
- Kristine Coleman
- Kristine Coleman, PhD, is a staff scientist and Head of the Behavioral Services Unit at the Oregon National Primate Research Center, Beaverton, Oregon. Melinda A. Novak, PhD, is a Professor in the Department of Psychological and Brain Sciences, University of Massachusetts, Amherst.
| | - Melinda A Novak
- Kristine Coleman, PhD, is a staff scientist and Head of the Behavioral Services Unit at the Oregon National Primate Research Center, Beaverton, Oregon. Melinda A. Novak, PhD, is a Professor in the Department of Psychological and Brain Sciences, University of Massachusetts, Amherst.
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14
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Chun K, Capitanio JP, Lamkin DM, Sloan EK, Arevalo JMG, Cole SW. Social regulation of the lymph node transcriptome in rhesus macaques (Macaca mulatta). Psychoneuroendocrinology 2017; 76:107-113. [PMID: 27902946 PMCID: PMC5510871 DOI: 10.1016/j.psyneuen.2016.10.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2016] [Revised: 10/28/2016] [Accepted: 10/28/2016] [Indexed: 12/29/2022]
Abstract
Previous research has shown that adverse social conditions may promote a conserved transcriptional response to adversity (CTRA) involving up-regulation of proinflammatory gene expression and down-regulation of Type I interferon anti-viral genes in circulating blood cells. However, the impact of social conditions on lymphoid tissue gene regulation remains largely unexplored. This project assessed how social instability in adult male rhesus macaques (N=10, 5 in unstable, and 5 in stable social conditions) might regulate gene expression within secondary lymphoid tissue (lymph nodes; LN). Unstable social conditions down-regulated axillary LN expression of genes involved in Type I interferon anti-viral responses. Transcript origin analyses implicated monocytes and B cells as cellular mediators of these effects, and promoter-based bioinformatics analyses indicated reduced activity of AP-1, NF-κB, IRF, and CREB transcription factors within the axillary LN microenvironment. Although the current study is limited in sample size, these results suggest that social influences on immune cell gene regulation extend beyond the circulating leukocyte pool to alter generalized transcriptome profiles in secondary lymphoid tissue, and they do so in a regulatory program that resembles the pattern of antiviral inhibition previously observed in circulating leukocytes.
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Affiliation(s)
- K Chun
- Cousins Center for PNI, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, CA 90095, USA.
| | - J P Capitanio
- California National Primate Research Center, USA; Department of Psychology, University of California, Davis, CA 95616, USA
| | - D M Lamkin
- Cousins Center for PNI, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, CA 90095, USA; Department of Psychiatry & Biobehavioral Sciences, UCLA David Geffen School of Medicine, Los Angeles, CA 90095, USA
| | - E K Sloan
- Cousins Center for PNI, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, CA 90095, USA; Drug Discovery Biology Theme, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia; Division of Cancer Surgery, Peter MacCallum Cancer Centre, Melbourne, Victoria 3000, Australia; UCLA AIDS Institute, USA; Jonsson Comprehensive Cancer Center, USA
| | - J M G Arevalo
- Cousins Center for PNI, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, CA 90095, USA; Division of Hematology-Oncology, David Geffen School of Medicine, USA; Jonsson Comprehensive Cancer Center, USA; UCLA Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA
| | - S W Cole
- Cousins Center for PNI, Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, CA 90095, USA; UCLA AIDS Institute, USA; Division of Hematology-Oncology, David Geffen School of Medicine, USA; Jonsson Comprehensive Cancer Center, USA; UCLA Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA
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Personality modulates proportions of CD4 + regulatory and effector T cells in response to socially induced stress in a rodent of wild origin. Physiol Behav 2016; 167:255-264. [DOI: 10.1016/j.physbeh.2016.09.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 09/02/2016] [Accepted: 09/15/2016] [Indexed: 12/20/2022]
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Sclafani V, Del Rosso LA, Seil SK, Calonder LA, Madrid JE, Bone KJ, Sherr EH, Garner JP, Capitanio JP, Parker KJ. Early Predictors of Impaired Social Functioning in Male Rhesus Macaques (Macaca mulatta). PLoS One 2016; 11:e0165401. [PMID: 27788195 PMCID: PMC5082922 DOI: 10.1371/journal.pone.0165401] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 10/11/2016] [Indexed: 11/21/2022] Open
Abstract
Autism spectrum disorder (ASD) is characterized by social cognition impairments but its basic disease mechanisms remain poorly understood. Progress has been impeded by the absence of animal models that manifest behavioral phenotypes relevant to ASD. Rhesus monkeys are an ideal model organism to address this barrier to progress. Like humans, rhesus monkeys are highly social, possess complex social cognition abilities, and exhibit pronounced individual differences in social functioning. Moreover, we have previously shown that Low-Social (LS) vs. High-Social (HS) adult male monkeys exhibit lower social motivation and poorer social skills. It is not known, however, when these social deficits first emerge. The goals of this study were to test whether juvenile LS and HS monkeys differed as infants in their ability to process social information, and whether infant social abilities predicted later social classification (i.e., LS vs. HS), in order to facilitate earlier identification of monkeys at risk for poor social outcomes. Social classification was determined for N = 25 LS and N = 25 HS male monkeys that were 1-4 years of age. As part of a colony-wide assessment, these monkeys had previously undergone, as infants, tests of face recognition memory and the ability to respond appropriately to conspecific social signals. Monkeys later identified as LS vs. HS showed impairments in recognizing familiar vs. novel faces and in the species-typical adaptive ability to gaze avert to scenes of conspecific aggression. Additionally, multivariate logistic regression using infant social ability measures perfectly predicted later social classification of all N = 50 monkeys. These findings suggest that an early capacity to process important social information may account for differences in rhesus monkeys' motivation and competence to establish and maintain social relationships later in life. Further development of this model will facilitate identification of novel biological targets for intervention to improve social outcomes in at-risk young monkeys.
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Affiliation(s)
- Valentina Sclafani
- Winnicott Research Unit, University of Reading, RG6 6AL, Reading, United Kingdom
- California National Primate Research Center, University of California Davis, Davis, California, 95616, United States of America
| | - Laura A. Del Rosso
- California National Primate Research Center, University of California Davis, Davis, California, 95616, United States of America
| | - Shannon K. Seil
- California National Primate Research Center, University of California Davis, Davis, California, 95616, United States of America
| | - Laura A. Calonder
- California National Primate Research Center, University of California Davis, Davis, California, 95616, United States of America
| | - Jesus E. Madrid
- Neurosciences Program, Stanford University, Stanford, California, 94305, United States of America
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, 94305, United States of America
| | - Kyle J. Bone
- California National Primate Research Center, University of California Davis, Davis, California, 95616, United States of America
| | - Elliott H. Sherr
- Department of Neurology, University of California San Francisco, San Francisco, California, 94143, United States of America
| | - Joseph P. Garner
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, 94305, United States of America
- Department of Comparative Medicine, Stanford University, Stanford, California, 94305, United States of America
| | - John P. Capitanio
- California National Primate Research Center, University of California Davis, Davis, California, 95616, United States of America
- Department of Psychology, University of California Davis, Davis, California, 95616, United States of America
| | - Karen J. Parker
- California National Primate Research Center, University of California Davis, Davis, California, 95616, United States of America
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, 94305, United States of America
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Cole SW, Nagaraja AS, Lutgendorf SK, Green PA, Sood AK. Sympathetic nervous system regulation of the tumour microenvironment. Nat Rev Cancer 2015; 15:563-72. [PMID: 26299593 PMCID: PMC4828959 DOI: 10.1038/nrc3978] [Citation(s) in RCA: 364] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The peripheral autonomic nervous system (ANS) is known to regulate gene expression in primary tumours and their surrounding microenvironment. Activation of the sympathetic division of the ANS in particular modulates gene expression programmes that promote metastasis of solid tumours by stimulating macrophage infiltration, inflammation, angiogenesis, epithelial-mesenchymal transition and tumour invasion, and by inhibiting cellular immune responses and programmed cell death. Haematological cancers are modulated by sympathetic nervous system (SNS) regulation of stem cell biology and haematopoietic differentiation programmes. In addition to identifying a molecular basis for physiologic stress effects on cancer, these findings have also identified new pharmacological strategies to inhibit cancer progression in vivo.
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Affiliation(s)
- Steven W. Cole
- Department of Medicine, Division of Hematology-Oncology, Geffen School of Medicine, UCLA Molecular Biology Institute, Norman Cousins Center, and Jonsson Comprehensive Cancer Center, University of California, Los Angeles
| | - Archana S. Nagaraja
- Departments of Gynecologic Oncology and Cancer Biology, University of Texas M. D. Anderson Comprehensive Cancer Center
| | - Susan K. Lutgendorf
- Departments of Psychology, Obstetrics and Gynecology, Urology, and Holden Comprehensive Cancer Center, University of Iowa
| | - Paige A. Green
- Basic Biobehavioral and Psychological Sciences Branch, Behavioral Research Program, Division of Cancer Control and Population Sciences, United States National Cancer Institute
| | - Anil K. Sood
- Departments of Gynecologic Oncology and Cancer Biology, University of Texas M. D. Anderson Comprehensive Cancer Center
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Re-establishment of anxiety in stress-sensitized mice is caused by monocyte trafficking from the spleen to the brain. Biol Psychiatry 2014; 75:970-81. [PMID: 24439304 PMCID: PMC4084643 DOI: 10.1016/j.biopsych.2013.11.029] [Citation(s) in RCA: 217] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 10/31/2013] [Accepted: 11/18/2013] [Indexed: 11/22/2022]
Abstract
BACKGROUND Persistent anxiety-like symptoms may have an inflammatory-related pathophysiology. Our previous work using repeated social defeat (RSD) in mice showed that recruitment of peripheral myeloid cells to the brain is required for the development of anxiety. Here, we aimed to determine if 1) RSD promotes prolonged anxiety through redistribution of myeloid cells and 2) prior exposure to RSD sensitizes the neuroimmune axis to secondary subthreshold stress. METHODS Mice were subjected to RSD and several immune and behavioral parameters were determined .5, 8, or 24 days later. In follow-up studies, control and RSD mice were subjected to subthreshold stress at 24 days. RESULTS Repeated social defeat-induced macrophage recruitment to the brain corresponded with development and maintenance of anxiety-like behavior 8 days after RSD, but neither remained at 24 days. Nonetheless, social avoidance and an elevated neuroinflammatory profile were maintained at 24 days. Subthreshold social defeat in RSD-sensitized mice increased peripheral macrophage trafficking to the brain that promoted re-establishment of anxiety. Moreover, subthreshold social defeat increased social avoidance in RSD-sensitized mice compared with naïve mice. Stress-induced monocyte trafficking was linked to redistribution of myeloid progenitor cells in the spleen. Splenectomy before subthreshold stress attenuated macrophage recruitment to the brain and prevented anxiety-like behavior in RSD-sensitized mice. CONCLUSIONS These data indicate that monocyte trafficking from the spleen to the brain contributes re-establishment of anxiety in stress-sensitized mice. These findings show that neuroinflammatory mechanisms promote mood disturbances following stress-sensitization and outline novel neuroimmune interactions that underlie recurring anxiety disorders such as posttraumatic stress disorder.
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Abstract
Although we generally experience our bodies as being biologically stable across time and situations, an emerging field of research is demonstrating that external social conditions, especially our subjective perceptions of those conditions, can influence our most basic internal biological processes-namely, the expression of our genes. This research on human social genomics has begun to identify the types of genes that are subject to social-environmental regulation, the neural and molecular mechanisms that mediate the effects of social processes on gene expression, and the genetic polymorphisms that moderate individual differences in genomic sensitivity to social context. The molecular models resulting from this research provide new opportunities for understanding how social and genetic factors interact to shape complex behavioral phenotypes and susceptibility to disease. This research also sheds new light on the evolution of the human genome and challenges the fundamental belief that our molecular makeup is relatively stable and impermeable to social-environmental influence.
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Affiliation(s)
- George M Slavich
- Cousins Center for Psychoneuroimmunology and Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles
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20
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JIN JIAN, SU YANJIE, TAO YUJING, GUO SIYUAN, YU ZEYING. Personality as a Predictor of General Health in Captive Golden Snub-Nosed Monkeys (Rhinopithecus roxellana). Am J Primatol 2013; 75:524-33. [DOI: 10.1002/ajp.22127] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 12/09/2012] [Accepted: 12/13/2012] [Indexed: 12/26/2022]
Affiliation(s)
- JIAN JIN
- Department of Psychology; Peking University; Beijing, P. R.; China
| | - YANJIE SU
- Department of Psychology; Peking University; Beijing, P. R.; China
| | - YUJING TAO
- Beijing Wildlife Park; Beijing, P. R.; China
| | - SIYUAN GUO
- Department of Psychology; School of Philosophy, Wuhan University; Wuhan, P. R.; China
| | - ZEYING YU
- Chinese Association of Zoological Gardens; Beijing, P. R.; China
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Liezmann C, Klapp B, Peters EM. Stress, atopy and allergy: A re-evaluation from a psychoneuroimmunologic persepective. DERMATO-ENDOCRINOLOGY 2011; 3:37-40. [PMID: 21519408 DOI: 10.4161/derm.3.1.14618] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Revised: 12/10/2010] [Accepted: 12/21/2010] [Indexed: 01/08/2023]
Abstract
Since the early days of psychosomatic thinking, atopic disease was considered exemplary. In the 70s and 80s numerous reports stated increased anxiety, depression or ill stresscoping in atopics in correlation with enhanced disease activity. Employed patient groups however were small and diverse and controls rare. Therefore, the question remained, whether psychopathological findings in atopics were of pathogenetic relevance or an epiphenomenon of chronic inflammatory disease. Recently, the discussion has been revived and refocused by psychoneuroimmunological findings. We now know that atopic disease is characterized by an imbalance of the classical stress-axis response along the hypothalamus-pituitary-adrenal axis (HPA) and the sympathetic axis (SA). This imbalance can be found shoulder-to-shoulder with enhanced expression of newly emerging neuroendocrine stress mediators such as substance P (SP) and nerve growth factor that form up to a third stress axis (neurotrophin neuropeptide axis: NNA). Together they can alter the inflammatory as well as the neuroendocrine stress-response on several levels. In skin, the immediate inflammatory response to stress involves neuropeptide release and mast cell degranulation, in short neurogenic inflammation. Systemically, antigen-presentation and TH2 cytokine bias are promoted under the influence of cortisol and neuropeptides. Imbalanced stress-responsiveness may therefore be at the core of exacerbated allergic disease and deserves re-evaluation of therapeutic options such as neutralization of SP-signaling by antagonists against its receptor NK1, cortisol treatment as supplementation and relaxation techniques to balance the stress-response.
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Affiliation(s)
- Christiane Liezmann
- University-Medicine Charité; Internal Medicine and Dermatology; Department of Psychosomatic Medicine and Psychotherapy; Berlin
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Rommeck I, Capitanio JP, Strand SC, McCowan B. Early social experience affects behavioral and physiological responsiveness to stressful conditions in infant rhesus macaques (Macaca mulatta). Am J Primatol 2011; 73:692-701. [PMID: 21462233 PMCID: PMC3100413 DOI: 10.1002/ajp.20953] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Revised: 02/27/2011] [Accepted: 03/01/2011] [Indexed: 11/09/2022]
Abstract
Studies on early development have demonstrated the profound effects of early social experience on the behavioral development and physiology of young rhesus macaques. Given these relationships, we hypothesized that rhesus macaques exposed to different nursery-rearing conditions may develop unique biobehavioral profiles. If this is true, the assessment of temperament may allow us to pinpoint successful rearing environments, thus improving the overall health of nonhuman primates that are raised in captive environments. We conducted biobehavioral assessments in order to examine differences in the development of infants raised under four different peer-rearing conditions (continuous pairing (CP), intermittent pairing, CP with partner rotation, and intermittent rotational pairing) and compared these animals with data from a mother-reared control group. Overall, continuous rotationally paired animals were most similar to mother-reared controls on most behavioral and temperament measures, suggesting that more socially complex rearing environments (greater number of social partners) favor a more active behavioral style. Cortisol profiles of mother-reared controls were similar to both CP groups, and these three groups had higher cortisol concentrations than the intermittent rotational-pairing group. In addition, intermittently paired infants displayed a significantly higher frequency of self-stroke behavior during a human intruder challenge, an abnormal behavior also known as floating limb which has been shown to be a precursor of self-biting. Overall, the data are consistent with the idea that social complexity in the nursery, as operationalized in our continuous rotational pairing, leads to a biobehavioral profile that is most similar to that of infants raised by their mothers in large, socially complex, cages.
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Affiliation(s)
- Ina Rommeck
- California National Primate Research Center
- University of California, Davis, Animal Behavior Graduate Group
- University of California, Davis, Human Development Graduate Group
| | - John P. Capitanio
- California National Primate Research Center
- University of California, Davis, Department of Psychology
| | | | - Brenda McCowan
- California National Primate Research Center
- University of California, Davis, Population, Health, and Reproduction, School of Veterinary Medicine
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Capitanio JP, Mendoza SP, Cole SW. Nervous temperament in infant monkeys is associated with reduced sensitivity of leukocytes to cortisol's influence on trafficking. Brain Behav Immun 2011; 25:151-9. [PMID: 20868738 PMCID: PMC2991489 DOI: 10.1016/j.bbi.2010.09.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2010] [Revised: 09/09/2010] [Accepted: 09/14/2010] [Indexed: 12/26/2022] Open
Abstract
There is growing evidence that temperament/personality factors are associated with immune function and health-related outcomes. Neuroticism, in particular, is a risk-factor for several diseases, many with a strong inflammatory component. We propose that neuroticism (or nervous temperament in monkeys) is related to dysregulation of immune function by glucocorticoids. The present study tested the hypothesis that animals with a nervous temperament would show no relationship between cortisol concentrations and leukocyte numbers in peripheral blood (an easily obtainable measure of glucocorticoid-mediated immune function), while animals low on this factor would show expected relationships. Infant rhesus monkeys (n=1507) experienced a standardized testing procedure involving blood sampling, behavioral tests, and temperament ratings. Results confirmed the hypothesis: low-nervous animals showed the expected positive relationship between cortisol levels and neutrophil numbers, while high-nervous animals showed no relationship. High-nervous animals also showed elevated cortisol concentrations at most sample points, and responded to a human challenge with more negative emotional behavior. These data suggest that individuals with a nervous temperament show evidence of glucocorticoid desensitization of immune cells. Differences with other studies, including the specific types of leukocytes that are affected, are discussed, and implications for disease processes are suggested.
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Affiliation(s)
- John P. Capitanio
- Department of Psychology, University of California, Davis, California National Primate Research, University of California, Davis
| | - Sally P. Mendoza
- Department of Psychology, University of California, Davis, California National Primate Research, University of California, Davis
| | - Steve W. Cole
- Dept. of Medicine, Division of Hematology-Oncology, UCLA School of Medicine, University of California, Los Angeles, Cousins Center for Psychoneuroimmunology, University of California, Los Angeles
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Schaevitz LR, Moriuchi JM, Nag N, Mellot TJ, Berger-Sweeney J. Cognitive and social functions and growth factors in a mouse model of Rett syndrome. Physiol Behav 2010; 100:255-63. [PMID: 20045424 DOI: 10.1016/j.physbeh.2009.12.025] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Revised: 12/18/2009] [Accepted: 12/22/2009] [Indexed: 11/18/2022]
Abstract
Rett syndrome (RTT) is an autism-spectrum disorder caused by mutations in the X-linked gene encoding methyl-CpG-binding protein 2 (MeCP2). Abnormalities in social behavior, stereotyped movements, and restricted interests are common features in both RTT and classic autism. While mouse models of both RTT and autism exist, social behaviors have not been explored extensively in mouse models of RTT. Here, we report cognitive and social abnormalities in Mecp2(1lox) null mice, an animal model of RTT. The null mice show severe deficits in short- and long-term object recognition memories, reminiscent of the severe cognitive deficits seen in RTT girls. Social behavior, however, is abnormal in that the null mice spend more time in contact with stranger mice than do wildtype controls. These findings are consistent with reports of increased reciprocal social interaction in RTT girls relative to classic autism. We also report here that the levels of the neurotrophins brain-derived neurotrophic factor (BDNF), insulin-like growth factor-1 (IGF-1), and nerve growth factor (NGF) are decreased in the hippocampus of the null mice, and discuss how this may provide an underlying mechanism for both the cognitive deficits and the increased motivation for social contact observed in the Mecp2(1lox) null mice. These studies support a differential etiology between RTT and autism, particularly with respect to sociability deficits.
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Affiliation(s)
- Laura R Schaevitz
- Department of Biological Sciences, Wellesley College, Wellesley MA 02481, United States
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25
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Cole SW, Mendoza SP, Capitanio JP. Social stress desensitizes lymphocytes to regulation by endogenous glucocorticoids: insights from in vivo cell trafficking dynamics in rhesus macaques. Psychosom Med 2009; 71:591-7. [PMID: 19553289 PMCID: PMC3008298 DOI: 10.1097/psy.0b013e3181aa95a9] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
OBJECTIVE To determine whether chronic social stress can desensitize leukocytes to normal physiologic regulation by endogenous glucocorticoids. METHODS We analyzed the longitudinal relationship between plasma cortisol levels and peripheral blood lymphocyte counts over 16 monthly assessments in 18 rhesus macaques randomized to recurrent social encounters with a stable set of conspecifics or continually varying social partners (unstable socialization). RESULTS Animals socialized under stable conditions showed the expected inverse relationship between plasma cortisol concentrations and circulating lymphocyte frequencies. That relationship was significantly attenuated in animals subject to unstable social conditions. Differences in leukocyte redistributional sensitivity to endogenous glucocorticoids emerged within the first week of differential socialization, persisted throughout the 60-week study period, and were correlated with other measures of glucocorticoid desensitization (blunted hypothalamic-pituitary-adrenal (HPA) axis response to acute stress and redistributional response to dexamethasone challenge). Effects of unstable social conditions on leukocyte sensitivity to cortisol regulation were not related to physical aggression. CONCLUSION Chronic social stress can impair normal physiologic regulation of leukocyte function by the HPA axis in ways that may contribute to the increased physical health risks associated with social adversity.
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Affiliation(s)
- Steve W Cole
- Department of Medicine, Division of Hematology-Oncology, UCLA School of Medicine, 11-934 Factor Building, Los Angeles, California 90095-1678, USA.
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Differences in the injury/sprouting response of splenic noradrenergic nerves in Lewis rats with adjuvant-induced arthritis compared with rats treated with 6-hydroxydopamine. Brain Behav Immun 2009; 23:276-85. [PMID: 18984038 DOI: 10.1016/j.bbi.2008.10.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2008] [Revised: 09/24/2008] [Accepted: 10/12/2008] [Indexed: 11/21/2022] Open
Abstract
Sympathetic nerves in the spleen undergo an injury and sprouting response with development of adjuvant-induced arthritis (AA), a model of rheumatoid arthritis (RA). The objective of the present study was to determine whether this injury and sprouting response is disease-specific or occurs in a non-specific manner similar to injury and sprouting responses following sympathectomy with specific neurotoxins. Changes in noradrenergic (NA) innervation in spleens from Lewis rats 28 days following adjuvant treatment to induce arthritis and/or local 6-hydroxydopamine (6-OHDA) treatment to destroy NA nerves were examined using immunocytochemistry for tyrosine hydroxylase (TH). We observed significant increases in sympathetic innervation of hilar regions, sites of nerve entry into the spleen, and a striking decline in innervation of splenic regions distant to the hilus in arthritic compared to non-arthritic rats. While increased hilar and decreased distal NA innervation in arthritic rats was strikingly similar to that of non-arthritic 6-OHDA-treated rats, there were differences in splenic compartments innervated by sympathetic nerves between these groups. In 6-OHDA-treated rats, NA nerves re-innervated splenic compartments normally innervated by sympathetic nerves. In arthritic rats, sympathetic nerves returned to normally innervated splenic compartments, but also abundantly innervated red pulp. These findings suggest that splenic sympathetic nerves undergo a disease-associated injury/sprouting response with disease development that alters the normal pattern and distribution of NA innervation. The altered sympathetic innervation pattern is likely to change NA signaling to immune cell targets, which could exert long-term regulatory influences on initiation, maintenance, and resolution of immune responses that impact disease pathology.
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Affiliation(s)
- John P. Capitanio
- California National Primate Research Center, Department of Psychology, University of California, Davis
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