Dr Guy Bewick

Dr Guy Bewick
Dr Guy Bewick

Dr Guy Bewick

BSc, PhD

Senior Lecturer

About

Rm 6:18

Institute of Medical Sciences

School of Medicine, Medical Sciences & Nutrition

Foresterhill

Aberdeen AB25 2ZD

Scotland

United Kingdom

Biography

I graduated with a BSc in Zoology and Animal Physiology from the University of East Anglia in 1979. After 3 years working for the Ministry of Agriculture, Fisheries and Food inspecting export grain for insect infestation, I began my research career with a PhD position in the Department of Physiology, King’s College London with Dr David A Tonge. This initiated my research interest studying how appropriate nerve-muscle connections are made and then adapted to their diverse functions. I gained my PhD in 1986, investigating the regeneration of nerve-muscle connections. Subsequent postdoctoral work investigated other aspects of neuromuscular function. First, with Prof Glen Cottrell in St Andrews, investigating how simple (acetylcholine) and complex (neuropeptides) molecules, called 'neurotransmitters', are used simultaneously for neuromuscular signalling. Later, I worked in the Department of Physiology, University of Bristol with Dr Tony Ridge, studying the developmental pruning of nerve-muscle connections. This led to a major 2-year period at the University of Colorado Health Sciences Center, Denver, Colorado, USA. Here, with Dr Bill Betz, we developed technique for using FM1-43 and related dyes for fluorescent studies of the kinetics and distribution of the tiny neurotrnamsitter packets (vesicles) during activity in living nerve terminals. Between 1991 and 1994, I worked with Prof Clarke Slater in the Muscular Dystrophy Group Research Laboratories, Newcastle General Hospital investigating the role of muscular dystrophy-related structural proteins in building nerve-muscle specialisations. I joined the University of Aberdeen in 1994.

Latest Publications

  • Spindles are doin' it for themselves: Glutamatergic autoexcitation in muscle spindles

    Bewick, G. S., Banks, R. W.
    Contributions to Journals
  • Mechanotransduction channels in proprioceptive sensory nerve terminals: still an open question?

    Bewick, G. S., Banks, R. W.
    Current Opinion in Physiology, vol. 20, pp. 90-104
    Contributions to Journals: Articles
  • Physiology 2019, Aberdeen

    Bewick, G., Scott, D. A., Tucker, S.
    Contributions to Specialist Publications: Featured Articles
  • Physiology 2019

    Bewick, G. S., Ball, D., Scott, D. A.
    Physiology News, pp. 28
    Contributions to Specialist Publications: Articles
  • New functions for the Proprioceptive System in Skeletal Biology

    Blecher, R., Heinemann-Yerushalmi, L., Assaraf, E., Konstantin, N., Chapman, J. R., Cope, T. C., Bewick, G. S., Banks, R. W., Zelzer, E.
    Philosophical Transactions of the Royal Society B: Biological Sciences, vol. 373, no. 1759, 20170327
    Contributions to Journals: Articles

View My Publications

Research

Research Overview

Dr Bewick’s research interests are centred on understanding how appropriate nerve-muscle signalling is established and maintained, both in motor and sensory systems. One focus is elucidating the role of the intriguing system of synaptic-like vesicles in mechanically sensitive sensory endings, he uncovered in collaboration with Dr Robert Banks of Durham University. This vesicle-based system seems to regulate the excitability of these sensory endings over a wide range, and is even capable of turning off the ending entirely. The other focus is on the neuromuscular junction, where he is examining how transmitter release from the motor terminal is maintained over a range of in vivo activity patterns. As well as understanding the basic neuroscience, he is exploring these control mechanisms as potential targets for strategies to ameliorate weakness in neuromuscular diseases.

Research Areas

Biomedical Sciences

Research Specialisms

  • Neuroscience

Our research specialisms are based on the Higher Education Classification of Subjects (HECoS) which is HESA open data, published under the Creative Commons Attribution 4.0 International licence.

Current Research

My laboratory has 2 major lines of investigation:

1) Characterising a novel system for regulating sensory nerve ending sensitivity.

Mechanosensory endings tell us where our arms and legs are, whether we're touching anything, and monitor our blood pressure. Tiny vesicles, just like those that contain neurotransmitter, occur in all such endings throughout the animal kingdom. So, this suggests they are probably important. In fact, in muscle stretch receptors, they can greatly increase sensitivity or, alternatively, even turn the ending off completely! The major interest now is to understand why this system is there and what advantage it confers. Then, we can understand if there are disease processes affecting it that were previously unsuspected, or might benefit from targetting this system with new drugs. For example, we are now testing if this same system in stretch-sensitive endings around blood vessels might be a targeted to treat one of the most prevalent and life-threatening conditions - high blood pressure (hypertension).

2) Making appropriate nerve-muscle connections:

We are studying how nerve terminals, which are very varied in their functions, learn what they should do when they get to the right target. They become adapted to maintaining neurotransmitter output over their normal range of everyday activity patterns. We want to know how this is done. Also, we want to find ways to rectify or enhance nerve terminal output if diseases, such as myasthenias,  make them defective. One recent interesting discovery is that a protein secreted by the muscle (transforming growth factor beta 2, TGF-beta2) is able to boost nerve-muscle signalling, and make it more efficient. This probably helps regulate signalling in normal, healthy muscles as they adapt to changing demands, such as growth, training and ageing. Importantly, however, we are now testing if it can be targeted to increase signalling in conditions where nerve-muscle signalling is weakened by disease, such as early stage motor neurone disease, and myasthenic conditions.

Publications

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  • Attenuation of the stretch-activated discharge of rat muscle and spindle afferents by ENaC channel inhibitors

    Bewick, G. S., Simon, A., Banks, R.
    Proceedings of the Physiological Society, vol. 10, no. PC41
    Contributions to Journals: Articles
  • Transforming growth factor-ß2 increases synaptic vesicle loading at rat neuromuscular junctions

    Fong, S., McLennan, I., Bewick, G. S.
    Proceedings of the Physiological Society, vol. 10, no. PC4
    Contributions to Journals: Abstracts
  • Autogenic modulation of mechanoreceptor excitability by glutamate release from synaptic-like vesicles: evidence from the rat muscle spindle primary sensory ending

    Bewick, G. S., Reid, B., Richardson, C., Banks, R. W.
    The Journal of Physiology, vol. 562, no. 2, pp. 381-394
    Contributions to Journals: Articles
  • Postnatal emergence of mature release properties in terminals of rat fast- and slow-twitch muscles

    Bewick, G. S., Reid, B., Jawaid, S., Hatcher, T., Shanley, L.
    European Journal of Neuroscience, vol. 19, no. 11, pp. 2967-2976
    Contributions to Journals: Articles
  • Glutamate-enhanced muscle spindle excitability - inhibition by PLD-coupled metabotropic glutamate receptor antagonists

    Bewick, G. S., Duncan, R., Eddie, W., Maguire, C., Banks, R. W.
    The Journal of Physiology, vol. 557P, C91
    Contributions to Journals: Abstracts
  • Activity-dependent plasticity of transmitter release from nerve terminals in rat fast and slow muscles

    Reid, B., Martinov, V. N., Nja, A., Lomo, T., Bewick, G. S.
    Journal of Neuroscience, vol. 23, no. 28, pp. 9340-9348
    Contributions to Journals: Articles
  • Maintenance of transmitter release from neuromuscular junctions with different patterns of usage "in vivo"

    Bewick, G. S.
    Journal of Neurocytology, vol. 32, no. 5-8, pp. 473-487
    Contributions to Journals: Articles
  • Evidence for activity-dependent modulation of sensory-terminal excitability in spindles by glutamate release from synaptic-like vesicles

    Banks, R. W., Bewick, G. S., Richardson, C., Reid, B.
    Advances in Experimental Medicine and Biology, vol. 508, pp. 13-18
    Contributions to Journals: Articles
  • Functional expression of cell surface cannabinoid CB(1) receptors on presynaptic inhibitory terminals in cultured rat hippocampal neurons

    Irving, A. J., Coutts, A. A., Harvey, J., Rae, M. G., Mackie, K., Bewick, G. S., Pertwee, R. G.
    Neuroscience, vol. 98, no. 2, pp. 253-262
    Contributions to Journals: Articles
  • Functional expression of cell surface cannabinoid CB1 receptors on presynaptic inhibitory terminals in cultured rat hippocampal neurons

    Irving, A. J., Coutts, A. A., Harvey, J., Rae, M. G., Mackie, K., Bewick, G. S., Pertwee, R. G.
    Neuroscience, vol. 98, pp. 253-262
    Contributions to Journals: Articles

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