Division of Neuroscience and Department of Neurology
Baylor College of Medicine, Houston
1989
Visiting Scientist
Neurosciences Department
Roche Institute of Molecular Biology
Nutley, New Jersey
1988-1989
Instructor
Department of Neurology
Baylor College of Medicine, Houston
Professional Groups:
Society for Neuroscience
Research Interests:
Physiological and pathological modulation of the electrical properties
of excitable cells.
Teaching Activities:
2005-present
Lecturer in Foundations of Cellular Neurophysiology (BIOL 337)
1990-1995
Guest lecturer in Molecular Neuroscience course
1983-2000
Computer Lab part of Cellular Neurophyisology Course
1978-Present
Member, Neurophysiology Journal Club
Other scientific skills and interests:
Electronic typesetting. I completely typeset the textbook by
Johnston, D. and Wu, S. Foundations of Cellular Neurophysiology. MIT
Press: Cambridge, 1995.
Computer modeling of neurons. I created simulations to produce
most of the figures in the textbook mentioned above, as well as
developed the computer simulation section of a cellular neurophysiology
course.
Electronics for neurophysiology. I have designed, built, or modified
several electronic devices used in cellular neurophysiology experiments.
Laboratory computer integration. I have played a major role in
the design and implementation of computer-based electrical and optical
recording systems using a variety of computer types and operating
systems.
Web integration of neural simulations and database functions.
I’ve written web-based frontends for neuron simulations, scientific-journal
editorship functions, lab inventory, and departmental requisition systems
using code written with HTML, PHP, and mySQL.
Bibliography:
Full Papers and Review Articles
Merickel, M. B. and Gray, R. Investigations of burst generation by the
electrically coupled cyberchron network in the snail Helisoma using a
single electrode voltage clamp. J. Neurobiol. 11:73-102, 1980.
Merickel, M. B., Gray, R., Chauvin, P. and Appel, S. Cultured
muscle from myotonic muscular dystrophy patients: Altered membrane
electrical properties. Proc. Natl. Acad. Sci. (USA) 78:648-652, 1981.
Merickel, M. B. and Gray, R. Electrophysiology of human muscle in
culture. Exp. Neurol. 72:281-293, 1981.
Merickel, M. B., Gray, R., Chauvin, P. and Appel, S. Physiology of
myotonic muscular dystrophy in culture. In: Diseases of the Motor Unit,Proceedings of the MDA Sixth International Conference. Schotland, D.
(ed.) Houghton Mifflin, 1981.
Appel, S.H., Merickel, M.B., Gray, R. and Moore, R.B. Membrane
abnormalities in the myotonic disorders. In: Neuromuscular Diseases.
Serratrice, G. (ed). Raven Press, New York. pp. 167-172.
Johnston, D., Hopkins, W. F., and Gray, R. Cellular mechanisms
of noradrenergic enhancement of long-term synaptic potentiation in
hippocampus. In: The Role of Neuroplasticity in the Response to Drugs.
Friedman, D. P. and Clouet, D. H. (eds.), NIDA Research Monograph
Series, Vol. 78: Rockville, MD, 1987, pp. 95-107.
Gray, R. A. and Johnston, D. Rectification of single GABA-gated
chloride channels in adult hippocampal neurons. J. Neurophysiol.
54:134-142, 1985.
Gray, R. and Johnston, D. Noradrenaline and beta-adrenoceptor
agonists increase the activity of voltage-dependent calcium channels
in hippocampal neurones. Nature 327:620-622, 1987.
Johnston, D., Hopkins, W. F., and Gray, R. Noradrenergic
enhancement of long-term synaptic potentiation. In: Long-TermPotentiation: From Biophysics to Behavior. Landfield, P. W. and
Deadwyler, S. (eds.), Alan R. Liss: New York, 1988, pp. 355-376.
Johnston, D., Hopkins, W.F., and Gray, R. Norepinephrine enhances
long-term potentiation at hippocampal mossy fiber synapses. In:
Synaptic Plasticity in the Hippocampus. Haas, H.L. and Buzsāki, G.,
(eds.), Springer-Verlag: Berlin, 1988, pp. 57-60.
Johnston, D., Hopkins, W.F., and Gray, R. The role of norepinephrine
in long-term potentiation at mossy fiber synapses in the hippocampus.
In: Neural Models of Plasticity. Byrne, J.H. and Berry, W.O. (eds.),
Academic Press, Inc.: San Diego, 1989, pp. 307-328.
Gray, R. Patch clamp analysis of ligand and voltage gated ion
channels in adult hippocampal neurons. Ph.D. Dissertation, Program
in Neuroscience, Baylor College of Medicine, 1988.
Johnston, D., Williams, S.H., Gray, R, and Fisher, R.E. Cholinergic and
noradrenergic modulation of long-term potentiation in hippocampal
CA3 neurons. In: Brain Signal Transduction and Memory. Ito, M.
and Nishizuka, Y. (eds.), Academic Press, Inc.: San Diego, 1989,
pp. 171-183.
Gray, R., Fisher, R., Spruston, N., and Johnston, D. Acutely Exposed
Hippocampal Neurons: A Preparation for Patch Clamping Neurons
from Adult Hippocampal Slices. In: Preparations of Vertebrate CentralNervous Systems In vitro. H. Jahnsen, (ed.), John Wiley & Sons, Ltd.:
Chichester, 1990, pp. 3-24.
Fisher, R., Gray, R., and Johnston, D. Properties and distribution of
single voltage-gated calcium channels in adult hippocampal neurons.
J. Neurophysiol. 64:91-104, 1990.
Chetkovich, D.M., Gray, R., Johnston,
D., and Sweatt, J.D. NMDA-receptor activation increases cAMP levels
and voltage-gated Ca2+-channel activity in area CA1 of hippocampus.
Proc. Nat. Acad. Sci.(USA) 88:6467-6471, 1991.
Johnston, D., Fisher, R.E., and Gray, R. Voltage-gated calcium
channels in adult hippocampal neurons. In: Ion Channels, VolumeIII. Narahashi, T., (ed.), Plenum Publishing Corp: New York, 1992,
pp. 39-62.
Johnston,
D., Williams, S., Jaffe, D., and Gray, R. NMDA-receptor independent
long-term potentiation. Annu. Rev. of Physiol., 54:489-505, 1992.
Gray, R., Rajan, A.S., Radcliffe, K.A., Yakehiro, M., and Dani, J.A.
Hippocampal synaptic transmission enhanced by low concentrations of
nicotine. Nature, 383:713-716, 1996.
Kapur, A., M. F. Yeckel, Gray, R., and Johnston, D. (1998). L-type
calcium channels are required for one form of hippocampal mossy fiber
LTP. J. Neurophysiol. 79(4): 2181-2190, 1998.
Liang, Y., L. L. Yuan, Johnston, D., Gray, R. Calcium Signaling at
Single Mossy Fiber Presynaptic Terminals in the Rat Hippocampus. JNeurophysiol. 87(2): 1132-1137, 2002.
Johnston, D., Christie, B.R., Frick, A., Gray, R., Hoffman, D.A.,
Schexnayder, L.K., Watanabe, S., and Yuan, L.-L. Active dendrites,
potassium channels, and synaptic plasticity. Philos. Trans. R. Soc.Lond. [Biol.] 358:667-674, 2003
Johnston, D., Christie, B.R., Frick, A., Gray, R., Hoffman,
D.A., Schexnayder, L.K., Watanabe, S., and Yuan, L.-L. Active
dendrites, potassium channels, and synaptic plasticity. In: Long-termPotentiation: Enhancing Neuroscience for 30 years. Bliss, T.V.P.,
Collingridge, G.L., and Morris, R.G.M. (eds.), Oxford University Press:
New York, 2004, pp. 95-107
Liang, Y., Johnston, D., and Gray, R. Presynaptic Internal Calcium
Release Enhances Transmission at Mossy fiber-CA3 Synapses. (in
preparation), 2004.
Abstracts
Merickel, M. B. and Gray, R. Identification of a non-decaying outward
current in an electrically coupled bursting network in the snail. Soc. forNeurosci. Abs. 4:383, 1978.
Merickel, M. B. and Gray, R. Membrane properties of rat skeletal
muscle in primary tissue culture. Biophys. J. 25(2):200a, 1979.
Merickel, M. B., Gray, R., Chauvin P. and Appel, S. Electrophysiology
of myotonic muscular dystrophy in culture. Soc. for Neurosci. Abs.
5:378, 1979.
Merickel, M. B. and Gray R. The role of Ca++ in the action potential
of primary cultured rat myotubes. Fed. Proc. 39(6):2038, 1980.
Merickel, M. B., Gray, R., Chauvin, P. and Appel S. Abnormal electrical
properties of myotonic muscular dystrophy in culture observed with
voltage clamp. Soc. for Neurosci. Abs. 6:303, 1980.
Gray, R. and Merickel, M.B. Modulation of the action potential and
ionic currents in primary cultured rat muscle. Soc. for Neurosci. Abs.
7:903, 1981.
Merickel, M. B., Gray, R. and Moore, R.B. Production of depolarizing
afterpotentials by high internal and external calcium concentrations.
Soc. for Neurosci. Abs. 7:903, 1981.
Gray, R., Kellaway, J., and Johnston, D. Electrical properties of acutely
isolated hippocampal neurons. Physiologist 25:221, 1982.
Gray, R., Kellaway, J., and Johnston, D. Recordings of single
GABA-activated channels from acutely-isolated hippocampal neurons.
Soc. Neurosci. Abstr. 9:1189, 1983.
Griffith, W.H., Gray, R., and Johnston, D. Patch-clamp recordings from
hippocampal pyramidal neurons in synaptically-intact slice fragments.
Soc. Neurosci. Abstr. 9:1190, 1983.
Gray, R. and Johnston, D. Macroscopic calcium currents in
acutely-exposed neurons from adult hippocampal slices. Biophys. J.
47:66a, 1985.
Gray, R. and Johnston,
D. Macroscopic calcium currents in acutely-exposed granule cells from
adult hippocampus. Soc. Neurosci. Abstr. 11:792, 1985.
Gray, R. and Johnston, D. Multiple types of calcium channels in
acutely-exposed neurons from adult hippocampus. Biophys. J. 49:432a,
1986.
Gray, R. and Johnston, D. Multiple types of calcium channels in
acutely exposed neurons from the adult guinea pig hippocampus. J.Gen. Physiol. 88:25a-26a, 1986.
Johnston, D., Lebeda, F.J., Barber, S.O., Carnevale, N.T., and
Gray, R. Functional reconstruction of hippocampal neurons. FifthAnnu. Conf. Biomed. Engrg., 1987.
Johnston, D. and Gray, R. Norepinephrine through beta-adrenoceptors
increases activity of single calcium channels in adult hippocampal
granule cells. IBRO, 1987.
Gray, R. and Johnston, D. Recordings of single calcium channels from
presynaptic mossy fiber terminals in adult guinea pig hippocampus.
Soc. Neurosci. Abstr. 14:68, 1988.
Fisher, R.E., Gray, R., and Johnston, D. beta-adrenoceptor
modulation of calcium channels in acutely exposed CA3 pyramidal neurons
of adult
guinea pig hippocampus. Soc. Neurosci. Abstr. 14:645, 1988.
Chetkovich, D.M., Gray, R., Johnston, D., and Sweatt, J.D. NMDA
receptors cause Ca2+-dependent increases in cAMP levels and
Ca2+-channel activity. Soc. Neurosci. Abstr. 17:384, 1991.
Jaffe, D.B., Williams, S.H., Gray, R., Spruston, N., and Johnston,
D. Induction mechanisms for NMDA-receptor independent LTP in
hippocampus. J. Cell. Biochem. 16E:222, 1992.
Gray, R. Macroscopic currents from hippocampal mossy fiber
presynaptic terminals. Soc. Neurosci. Abstr. 19:1519, 1993.
Gray, R. and Dani, J.A. Presynaptic nicotinic receptors enhance
glutamate release in the hippocampal slice and raise Ca2+ in single
mossy-fiber terminals. Soc. Neurosci. Abstr. 22:1523, 1996.
Hoffman, D., Magee, J., Gray, R., and Johnston, D. Modulation
of transient, A-type K+ channels in dendrites of hippocampal CA1
pyramidal neurons. Soc. Neurosci. Abstr. 23:1394, 1997.
Yuan, L.L, Johnston, D., and Gray, R. Characterization of
presynaptic Ca2+ signaling at single mossy fiber terminals (MFTs).
Soc. Neurosci. Abstr. 25:1253, 1999.
Liang, Y., L. L. Yuan, Johnston, D., Cook, E.P., Gray, R. Calcium
signaling at single mossy fiber presynaptic terminals. Soc. Neurosci.Abstr. 26(1): 88, 2000.
Yeckel, M. F., Y. Liang, Gray, R., Johnston, D. Kainate
receptor-mediated release of Ca2+ from internal stores at hippocampal
mossy fiber-CA3 synapses. Soc. Neurosci. Abstr. 26(2): 1389, 2000.
Liang, Y., Johnston, D., and Gray, R.
Presynaptic calcium release enhances transmssion at mossy fiber-CA3
synapses. Soc. Neurosci. Abstr. 686.4, 2003.