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Marcelo Ribeiro Bergamini, Fernanda Kabadayan, Maria Martha Bernardi, Ivana Barbosa Suffredini, Marcia Tonetti Ciaramicoli, Ricardo Matsura Kodama, Cintia Helena Coury Saraceni
INTRODUCTION: The perception of pain varies individually. Chronic stress leads to analgesia. The use of animal chronic mild stress model to mimic human condition was previously developed and now applied in the evaluation of pain perception in rats with dentin hypersensitivity (DH). AIMS: Using DH model induced by dentin erosion (DE) mediated by acidic solution, the present study aimed the evaluation of the interaction of chronic stress and pain induced by DH in rats with DE...
October 15, 2016: Archives of Oral Biology
Lívia R Teixeira, Stelio P L Luna, Lídia M Matsubara, Maria L B Cápua, Bianca P C R Santos, Luciane R Mesquita, Luis G Faria, Felipe S Agostinho, Anna Hielm-Björkman
OBJECTIVE To evaluate pain intensity and kinetic variables in dogs with hip dysplasia (HD) treated with acupuncture, carprofen, or a placebo. DESIGN Randomized, controlled clinical study. ANIMALS 54 HD-affected dogs and 16 healthy dogs. PROCEDURES Seven HD-affected dogs were removed from the study. Dogs with HD were treated in a blinded manner for 30 days with acupuncture (once weekly for 5 sessions; n = 15), carprofen (4.4 mg/kg [2.0 mg/lb], PO, q 24 h; n = 16), or placebo capsules containing lactose (1 mg/kg [0...
November 1, 2016: Journal of the American Veterinary Medical Association
Kai Yang, Gangfeng Liu, Jihong Yan, Tao Wang, Xinbin Zhang, Jie Zhao
The highly efficient and agile water-surface locomotion of water striders has attracted substantial research attention. Compared with imitating the horizontal rowing motion, imitating the jumping capability of water striders is much more challenging because the strong interaction in the jumping process easily causes the robot to sink. This study focuses on designing a miniature robot capable of continuously jumping on the water surface. A spring-based actuating mechanism is proposed to produce a large jumping force...
October 21, 2016: Bioinspiration & Biomimetics
Hyunglae Lee, Elliott J Rouse, Hermano Igo Krebs
The human ankle joint plays a critical role during walking and understanding the biomechanical factors that govern ankle behavior and provides fundamental insight into normal and pathologically altered gait. Previous researchers have comprehensively studied ankle joint kinetics and kinematics during many biomechanical tasks, including locomotion; however, only recently have researchers been able to quantify how the mechanical impedance of the ankle varies during walking. The mechanical impedance describes the dynamic relationship between the joint position and the joint torque during perturbation, and is often represented in terms of stiffness, damping, and inertia...
2016: IEEE Journal of Translational Engineering in Health and Medicine
Norah Lynn-Anne Mund, Wycliffe Omurwa Masanta, Anne-Marie Goldschmidt, Raimond Lugert, Uwe Groß, Andreas E Zautner
Campylobacter jejuni's flagellar locomotion is controlled by eleven chemoreceptors. Assessment of the distribution of the relevant chemoreceptor genes in the C. jejuni genomes deposited in the National Center for Biotechnology Information (NCBI) database led to the identification of two previously unknown tlp genes and a tlp5 pseudogene. These two chemoreceptor genes share the same locus in the C. jejuni genome with tlp4 and tlp11, but the gene region encoding the periplasmic ligand binding domain differs significantly from other chemoreceptor genes...
September 29, 2016: European Journal of Microbiology & Immunology
IbDanelo Cortez, Dmitry V Bulavin, Ping Wu, Erica L McGrath, Kathryn A Cunningham, Maki Wakamiya, John Papaconstantinou, Kelly T Dineley
A major aspect of mammalian aging is the decline in functional competence of many self-renewing cell types, including adult-born neuronal precursors. Since age-related senescence of self-renewal occurs simultaneously with chronic up-regulation of the p38MAPKalpha (p38α) signaling pathway, we used the dominant negative mouse model for attenuated p38α activity (DN-p38α(AF/+)) in which Thr180 and Tyr182 are mutated (T→A/Y→F) to prevent phosphorylation activation (DN-p38α(AF/+)) and kinase activity. As a result, aged DN-p38α(AF/+) mice are resistant to age-dependent decline in proliferation and regeneration of several peripheral tissue progenitors when compared to wild-type littermates...
October 17, 2016: Behavioural Brain Research
Sandra A Heldstab, Carel P van Schaik, Karin Isler
Humans stand out among non-aquatic mammals by having both an extremely large brain and a relatively large amount of body fat. To understand the evolution of this human peculiarity we report a phylogenetic comparative study of 120 mammalian species, including 30 primates, using seasonal variation in adult body mass as a proxy of the tendency to store fat. Species that rely on storing fat to survive lean periods are expected to be less active because of higher costs of locomotion and have increased predation risk due to reduced agility...
November 2016: Journal of Human Evolution
Marie-Pascale Côté, Marion Murray, Michel A Lemay
Body-weight supported locomotor training (BWST) promotes recovery of load-bearing stepping in lower mammals, but its efficacy in individuals with a spinal cord injury (SCI) is limited and highly dependent on injury severity. While animal models with complete spinal transections recover stepping with step-training, motor complete SCI individuals do not, despite similarly intensive training. In this review, we examine the significant differences between humans and animal models that may explain this discrepancy in the results obtained with BWST...
October 20, 2016: Journal of Neurotrauma
Naseem Jamnia, Janice H Urban, Grace Beth Stuzmann, Sarah Chiren, Emily Reisenbigler, Robert Marr, Daniel A Peterson, Dorothy A Kozlowski
Repeat concussions (RC) can result in significant long-term neurological consequences and increased risk for neurodegenerative disease compared to single concussion (SC). Mechanisms underlying this difference are poorly understood and best elucidated using an animal model. To the best of our knowledge, there is no closed-head model in the adult rat using a commercially available device. We developed a novel and clinically relevant closed-head injury (CHI) model of both single and multiple concussions in the adult rat using a controlled cortical impact (CCI) device...
October 20, 2016: Journal of Neurotrauma
Samuel Ginot, Lionel Hautier, Laurent Marivaux, Monique Vianey-Liaud
Studies linking postcranial morphology with locomotion in mammals are common. However, such studies are mostly restricted to caviomorphs in rodents. We present here data from various families, belonging to the three main groups of rodents (Sciuroidea, Myodonta, and Ctenohystrica). The aim of this study is to define morphological indicators for the astragalus and calcaneus, which allow for inferences to be made about the locomotor behaviours in rodents. Several specimens were dissected and described to bridge the myology of the leg with the morphology of the bones of interest...
2016: PeerJ
Katelyn N Benthall, Ryan A Hough, Andrew D McClellan
Following spinal cord injury (SCI) in the lamprey, there is virtually complete recovery of locomotion within a few weeks, but interestingly, axonal regeneration of reticulospinal (RS) neurons is mostly limited to short distances caudal to the injury site. To explain this situation, we hypothesize that descending propriospinal (PS) neurons relay descending drive from RS neurons to indirectly activate spinal central pattern generators (CPGs). In the present study, the contributions of PS neurons to locomotor recovery were tested in the lamprey following SCI...
October 19, 2016: Journal of Neurophysiology
Claudia Kathe, Thomas Haynes Hutson, Stephen Brendan McMahon, Lawrence David Falcon Moon
Brain and spinal injury reduce mobility and often impair sensorimotor processing in the spinal cord leading to spasticity. Here, we establish that complete transection of corticospinal pathways in the pyramids impairs locomotion and leads to increased spasms and excessive mono- and polysynaptic low threshold spinal reflexes in rats. Treatment of affected forelimb muscles with an adeno-associated viral vector (AAV) encoding human Neurotrophin-3 at a clinically-feasible time-point after injury reduced spasticity...
October 19, 2016: ELife
Jonghoon Park, Kazuko Ishikawa-Takata, Sangjik Lee, Eunkyung Kim, Kiwon Lim, Hyungryul Kim, In-Sook Lee, Shigeho Tanaka
PURPOSE: The purpose of the current study was to investigate steps per day (steps/d) and physical activity level (PAL) in Korean elementary school children having normal weight (normal-weight). We also clarified whether a gender difference exited between steps/d and PAL. METHODS: Children aged 9 to 12 y were recruited from two elementary schools located in different urban districts in Korea. The present study included 33 Korean children, of which 18 were normal-weight boys and 15 were normal-weight girls...
September 2016: Journal of Exercise Nutrition & Biochemistry
Linda J Gormezano, Scott R McWilliams, David T Iles, Robert F Rockwell
Trade-offs between locomotory costs and foraging gains are key elements in determining constraints on predator-prey interactions. One intriguing example involves polar bears pursuing snow geese on land. As climate change forces polar bears to spend more time ashore, they may need to expend more energy to obtain land-based food. Given that polar bears are inefficient at terrestrial locomotion, any extra energy expended to pursue prey could negatively impact survival. However, polar bears have been regularly observed engaging in long pursuits of geese and other land animals, and the energetic worth of such behaviour has been repeatedly questioned...
2016: Conservation Physiology
Douglas Senna Engelke, Renato Filev, Luiz E Mello, Jair Guilherme Santos-Junior
Addiction is a multifactorial disease that comprises physiological mechanisms of learning and memory. Addict subjects have intense plasticity in cortical and limbic circuits during intoxication, abstinence or even in drug seeking behavior. Locomotor sensitization is a classic animal model of drug addiction that mimics the changes that occur in the transition from drug use to drug addiction. Several studies have demonstrated the importance of contextual associative processes in this task. However, whether the mechanisms of sensitization are maintained and precise over the time remain an open question...
October 15, 2016: Behavioural Brain Research
Lawrence Szewciw, Francois Barthelat
Teleost fish skin is a multifunctional natural material with high penetration resistance owing to specialized puncture mechanisms of both the individual scale and the intact scaled integument. In this paper, we explore the possible additional role of the skin in fish undulatory locomotion by examining the structural and mechanical properties of the dermal stratum (s.) compactum layer of striped bass (Morone saxatilis) skin. The structure, mechanical response and function of s. compactum was investigated by combining several methods: optical microscopy and histology, tensile tests on descaled skin specimens in different anatomical locations and orientations, puncture tests, and flexural tests on whole fish with disruption of the s...
September 28, 2016: Journal of the Mechanical Behavior of Biomedical Materials
Sintip Pattanakuhar, Anchalee Pongchaidecha, Nipon Chattipakorn, Siriporn C Chattipakorn
Skeletal muscles play important roles in metabolism, energy expenditure, physical strength, and locomotive activity. Skeletal muscle fibre types in the body are heterogeneous. They can be classified as oxidative types and glycolytic types with oxidative-type are fatigue-resistant and use oxidative metabolism, while fibres with glycolytic-type are fatigue-sensitive and prefer glycolytic metabolism. Several studies demonstrated that an obese condition with abnormal metabolic parameters has been negatively correlated with the distribution of oxidative-type skeletal muscle fibres, but positively associated with that of glycolytic-type muscle fibres...
October 15, 2016: Obesity Research & Clinical Practice
Andresa H Betti, Camila B Antonio, Thais E T Pompeu, Thaise S Martins, Vivian Herzfeldt, Eveline D Stolz, Carlos A M Fraga, Eliezer Barreiro, François Noël, Stela M K Rates
Aiming to identify new antipsychotic lead-compounds, our group has been working on the design and synthesis of new N-phenylpiperazine derivatives. Here, we characterized LASSBio-1422 as a pharmacological prototype of this chemical series. Adult male Wistar rats and CF1 mice were used for in-vitro and in-vivo assays, respectively. LASSBio-1422 [1 and 5 mg/kg, postoperatively (p.o.)] inhibited apomorphine-induced climbing as well as ketamine-induced hyperlocomotion (1 and 5 mg/kg, p.o.), animal models predictive of efficacy on positive symptoms...
October 13, 2016: Behavioural Pharmacology
Bumjin Jang, Wei Wang, Samuel Wiget, Andrew J Petruska, Xiangzhong Chen, Chengzhi Hu, Ayoung Hong, David Folio, Antoine Ferreira, Salvador Pané, Bradley J Nelson
We report the partial core-shell nanowire motors. These nanowires are fabricated using our previously developed electrodeposition-based technique, and their catalytic locomotion in the presence of H2O2 is investigated. Unlike conventional bimetallic nanowires that are self-electroosmotically propelled, our Au/Ru core-shell nanowires show both a noticeable decrease in rotational diffusivity and increase in motor speed with nanowire length. Numerical modelling based on self-electroosmosis attributes the decreases in rotational diffusivity to the formation of toroidal vortices at the nanowire tail, but fails to explain the speed increase with length...
October 18, 2016: ACS Nano
Yuki Imaizumi, Kazuo Eguchi, Toshiki Kaihara, Kumiko Urano, Rieko Shinagawa, Minoru Araki, Koji Inoue, Koichiro Hokao, Yuka Tsujita, Takuya Furusawa, Ryuichiro Kaku, Kazuomi Kario
OBJECTIVE: We tested the hypothesis that sarcopenia, an age-related loss of skeletal muscle mass and function, is associated with arterial stiffness in patients with diabetes (DM). DESIGN AND METHOD: We studied 65 hypertensives in the Real BP study, an observational study of home BP telemonitoring system. As parameters of sarcopenia, we used locomotive syndrome scale, circumference of the wrist, lower leg, and thigh (10 cm above the patella), grip strength, and 6 minute-walk test...
September 2016: Journal of Hypertension
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