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Reduced Locomotor Activity Correlates with Increased Severity of Arthritis in a Mouse Model of Antibody-Induced Arthritis

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Open Journal of Rheumatology and Autoimmune Diseases 2014年第1期4卷 62-68页

作者： Narendiran Rajasekaran Ricky Tran Conrado Pascual Xinmin Xie Elizabeth D. Mellins afasci research laboratory Redwood City USA. Department of Pediatrics Program in Immunology Stanford University Medical Center Stanford USA Department of Pediatrics Program in Immunology Stanford University Medical Center Stanford USA

Introduction: Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by synovial hyperplasia and progressive cartilage and bone destruction that leads to a substantial loss of general functions and/or a decline in physical activities such as walking speed in humans. The K/BxN serum transfer arthritis in mice shares many immunological and pathological features with human RA. Very few studies are available in mice that investigate the changes in physical activity in relation to arthritis development. In this study we investigate the effect of arthritis on the locomotor activity of mice during K/BxN sera transfer arthritis. Methods: Arthritis was induced in Balb/c mice by injecting intraperitoneally with 200 μl of K/BxN sera;Balb/c mice injected with phosphate buffered saline (PBS) served as control. Progress of arthritis was estimated by daily measurements of joint thickness. Each mouse’s locomotor activity (travel distance and travel time) was assessed every day for duration of 20 minute period using the SmartCageTM platform. Data were analyzed using the SmartCageTM analysis software (CageScoreTM). Results: Arthritic Balb/c mice showed a reduction in distance covered and travel speed when compared to arthritis-free, control Balb/c mice. Maximum decline in locomotor activity was observed during the peak period of the disease and correlated to the increase in joint thickness in the arthritic mice. Conclusion: This report demonstrates that measuring locomotor activity of mice during progression of K/BxN sera-induced arthritis using the SmartCageTM platform offers a quantitative method to assess physical activity in mice during arthritis.

关键词： K/BxN Arthritis Locomotion Serum Transfer

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Automated monitoring of early neurobehavioral changes in mice following traumatic brain injury

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Neural Regeneration research 2016年第2期11卷 248-256页

作者： Wenrui Qu Nai-kui Liu Xin-min (Simon) Xie Rui Li Xiao-ming Xu Hand & Foot Surgery and Reparative & Reconstructive Surgery Center Orthopaedic Hospital of the Second Hospital of Jilin UniversityChangchun Jilin Province China Spinal Cord and Brain Injury research Group Stark Neurosciences Research Institute Indiana University School of Medicine Indianapolis IN USA Department of Neurological Surgery Indiana University School of Medicine Indianapolis IN USA Department of Anatomy and Cell Biology Indiana University School of Medicine Inclianapolis IN USA Goodman Campbell Brain and Spine Inctianapolis IN USA afasci research Laboratories Redwood City CA USA

Traumatic brain injury often causes a variety of behavioral and emotional impairments that can develop into chronic disorders. Therefore, there is a need to shift towards identifying early symptoms that can aid in the prediction of traumatic brain injury outcomes and behavioral endpoints in patients with traumatic brain injury after early interventions. In this study, we used the Smart Cage system, an automated quantitative approach to assess behavior alterations in mice during an early phase of traumatic brain injury in their home cages. Female C57BL/6 adult mice were subjected to moderate controlled cortical impact（CCI） injury. The mice then received a battery of behavioral assessments including neurological score, locomotor activity, sleep/wake states, and anxiety-like behaviors on days 1, 2, and 7 after CCI. Histological analysis was performed on day 7 after the last assessment. Spontaneous activities on days 1 and 2 after injury were significantly decreased in the CCI group. The average percentage of sleep time spent in both dark and light cycles were significantly higher in the CCI group than in the sham group. For anxiety-like behaviors, the time spent in a light compartment and the number of transitions between the dark/light compartments were all significantly reduced in the CCI group than in the sham group. In addition, the mice suffering from CCI exhibited a preference of staying in the dark compartment of a dark/light cage. The CCI mice showed reduced neurological score and histological abnormalities, which are well correlated to the automated behavioral assessments. Our findings demonstrate that the automated Smart Cage system provides sensitive and objective measures for early behavior changes in mice following traumatic brain injury.

关键词： nerve regeneration traumatic brain injury controlled cortical impact automated behavior motor activity anxiety exploratoryactivity sleep neural regeneration

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