Location: Life Sciences Building, Room 313,
501 S. Nedderman Dr., Arlington, TX 76019
Mailing address: P.O. Box 19528
Behavioral Neuroscience and Neurophysiology Laboratories
The Behavioral Neuroscience and Neurophysiology Laboratories are a component of the UTA Department of Psychology. The laboratories use modern behavioral and electrophysiological analyses to explore the underlying relationship between neuronal function and behavior. This integrative approach involves the use of molecular biology, biochemistry, immunocytohistochemistry, neurophysiology, anatomy, and a wide range of behavioral methodology to understand the function of the nervous system. Members of the neuroscience subprogram use these approaches to explore behavior, pain processing, learning and memory, anxiety, depression and mechanisms underlying drug abuse and addiction.
Pain is a significant national health problem. It is the most common reason individuals seek medical care, with 40 million medical visits annually, costing the American public more than $100 billion each year. Thus, both clinical and basic studies share equal importance in helping benefit patients suffering various conditions of pain. There are various tools to address the pain problem. Here at UTA, we are studying pain by means of basic research and biopsychosocial research. The major interest of our basic research focuses on the studying the neurophysiological mechanisms of nociception by means of electrophysiological and behavioral neuroscience techniques.
Perry Fuchs, Professor
The focus of Dr. Fuchs’ overall research is aimed at exploring the basic, underlying central and peripheral nervous system mechanisms associated with rewarding and aversive stimuli. Experimental models, such as peripheral inflammation and neural injury, produce aversive behavioral responses that are associated with pain. A noxious stimulus usually engages in specific peripheral mechanisms, causing several conscious sensations consisting of judgments regarding the location and extent of tissue damage. Typically, there is also an alteration in effect and an induction of subconscious somatic and autonomic responses. Using a variety of experimental models, central mechanisms of pain processing are elucidated using focal electrical stimulation, microinjection, and lesion techniques. Research on peripheral mechanisms focuses on the coupling between the sympathetic and somatic nervous systems.
Yuan Bo Peng, M.D., Professor
Dr. Peng’s research interests include physiological mechanisms of pain. His lab is interested in studying the neurophysiological mechanisms of nociception by means of electrophysiological techniques in both the peripheral and central nervous systems. His lab has been studying in these areas: (1) Dorsal root reflexes in peripheral inflammation; (2) Cortical modulation of spinal dorsal horn neuronal activity; (3) Pain mechanisms of experimental autoimmune encephalomyelitis; (4) Detection of neuronal activities by optic spectroscopy; (5) Development and application of telemetry system for recording and stimulating in the nervous system.
Qing Lin, M.D., Associate Professor
Mechanisms of Neurogenic Inflammation Induced Pain is a research project funded by the National Institutes of Health (NIH). Neurogenic inflammation is the process by which inflammatory mediators released from sensory nerve terminals produce inflammation in their target tissue. This process exacerbates pain. Neurogenic inflammation contributes to many clinically relevant states, including arthritis, inflammatory bowel disease, complex regional pain syndrome (CRPS), chronic bronchitis, migraine, and interstitial cystitis. One of the mechanisms by which neurogenic inflammation is induced, is the effector function of primary nociceptive afferent fibers. It is hypothesized that antidromic activity in primary afferents triggers the release of inflammatory mediators from these terminals when peripheral tissue is damaged, which helps develop neurogenic inflammatory pain. An increasing number of studies demonstrate that the antidromic activity of primary afferent fibers is centrally mediated by way of dorsal root reflexes (DRRs). In order to investigate its mechanisms, we have experimentally established an acute model of neurogenic inflammation by using intradermal capsaicin (CAP) injection. The long-term goal of the proposed studies is to elucidate how neurogenic inflammation is initiated by action of the peripheral nociceptive molecule, the transient receptor potential vanilloid-1 (TRPV1) activated by CAP, then maintained by triggering the centrally mediated antidromic activity, DRRs, to exacerbate inflammatory pain, and how the released inflammatory mediators driven by DRRs participate in the process of pain sensation. Currently, our specific goals are 1) to determine if neurogenic inflammation following CAP injection involves triggering DRRs that cause the release of calcitonin gene-related peptide and/or substance P from primary afferent nociceptors and if this process would, in turn, enhance the CAP-induced sensitization of primary afferent nociceptors, as well as analyze if this process is initiated by activation of TRPV1 receptors; 2) to examine if activation of the TRPV1 receptors in primary afferent nociceptors plays an important role in enhancing DRRs by activating GABAergic interneurons in dorsal horn circuits; 3) to determine if phosphorylation of protein kinase C (PKC) takes place in the primary afferent neurons when neurogenic inflammation is initiated and develops and if TRPV1 receptors are upregulated by the phosphorylation of PKC.
Electrophysiology, neuropharmacology, neurochemistry, immunocytochemistry (confocal imaging analysis), Western blots, and laser Doppler blood flow meter are utilized to perform these studies. In addition, we are currently developing molecular biological techniques, such as PCR, aiming at a deeper study of ionic and molecular targets by which the DRRs mediate inflammatory pain. Uncovering these mechanisms will be critical for pharmaceutical manufacturers and clinicians to develop new anti-inflammatory therapies and improve the healthcare for patients.
Linda Perrotti, Professor
Dr. Perrotti’s primary research interests are focused on the neural mechanisms underlying sex differences in the behavioral and molecular responses to psychostimulant and opioid drugs. The overall goal of her work is to clarify interactions among the neuroendocrine system and dopamine reward system using rodent models of addictive behaviors. Her second area of interest is the further examination of the “tail of the ventral tegmental area” or “rostromedial tegmental nucleus” (tVTA/RMTg) as a major nucleus modulating dopamine-driven drug reward. Using rodents as model organisms, She investigates the initiation, acquisition, expression, extinction and reacquisition of conditioned drug reward. She is particularly interested in the biochemical and neuroendocrine factors which predispose certain individuals to respond differentially to drugs of abuse. The goal of her lab’s research is to better understand the biological basis of this disease and to identify major biological targets for potential therapeutic intervention to promote abstinence and prevention.