Volume 31 Issue 1
Jan.  2010
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LU Chang-Liang, ZHANG Xiao-Meng, ZHU Jian-Ping, AI Hong-Bin. Effects of L-Glutamate Microinjection into the Ventral Horn of Spinal Cord Gray Matter on Gastrocnemius Contractility in Toad. Zoological Research, 2010, 31(1): 94-98. doi: 10.3724/SP.J.1141.2010.01094
Citation: LU Chang-Liang, ZHANG Xiao-Meng, ZHU Jian-Ping, AI Hong-Bin. Effects of L-Glutamate Microinjection into the Ventral Horn of Spinal Cord Gray Matter on Gastrocnemius Contractility in Toad. Zoological Research, 2010, 31(1): 94-98. doi: 10.3724/SP.J.1141.2010.01094

Effects of L-Glutamate Microinjection into the Ventral Horn of Spinal Cord Gray Matter on Gastrocnemius Contractility in Toad

doi: 10.3724/SP.J.1141.2010.01094
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  • Corresponding author: AI Hong-Bin
  • Received Date: 2009-08-11
  • Rev Recd Date: 1900-01-01
  • Publish Date: 2010-02-22
  • A diagram of motor neuron pool of ventral horn of spinal cord gray matter in toad was first delineated. Different concentrations (1,0.5,0.1,0.01 mol/L) of excitatory amino acid L-Glu or physiological saline (0.65% NaCl) were then microinjected into the motor neuron pool in a urethane-anaesthetized toad. The contraction curve of the gastrocnemius was then recorded by the BL-420 Physiological Signal Recording. We took the maximal tension, the duration of rising phase, the velocity of tension variation, and the duration of descending phase as the parameters to study the characteristic of gastrocnemius contractility. It was found that the gastrocnemius contractility of all the 4 groups was tetanus but differed in degree, especially the maximal tension, and velocity of tension variation. In contrast to physiological saline, gastrocnemius contracted by the stimulation of L-Glu, and the contraction parameter showed dose-effect relationships except for the duration of descending phase, which was caused by the combination rate of L-Glu and the receptor.
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Effects of L-Glutamate Microinjection into the Ventral Horn of Spinal Cord Gray Matter on Gastrocnemius Contractility in Toad

doi: 10.3724/SP.J.1141.2010.01094
    Corresponding author: AI Hong-Bin

Abstract: A diagram of motor neuron pool of ventral horn of spinal cord gray matter in toad was first delineated. Different concentrations (1,0.5,0.1,0.01 mol/L) of excitatory amino acid L-Glu or physiological saline (0.65% NaCl) were then microinjected into the motor neuron pool in a urethane-anaesthetized toad. The contraction curve of the gastrocnemius was then recorded by the BL-420 Physiological Signal Recording. We took the maximal tension, the duration of rising phase, the velocity of tension variation, and the duration of descending phase as the parameters to study the characteristic of gastrocnemius contractility. It was found that the gastrocnemius contractility of all the 4 groups was tetanus but differed in degree, especially the maximal tension, and velocity of tension variation. In contrast to physiological saline, gastrocnemius contracted by the stimulation of L-Glu, and the contraction parameter showed dose-effect relationships except for the duration of descending phase, which was caused by the combination rate of L-Glu and the receptor.

LU Chang-Liang, ZHANG Xiao-Meng, ZHU Jian-Ping, AI Hong-Bin. Effects of L-Glutamate Microinjection into the Ventral Horn of Spinal Cord Gray Matter on Gastrocnemius Contractility in Toad. Zoological Research, 2010, 31(1): 94-98. doi: 10.3724/SP.J.1141.2010.01094
Citation: LU Chang-Liang, ZHANG Xiao-Meng, ZHU Jian-Ping, AI Hong-Bin. Effects of L-Glutamate Microinjection into the Ventral Horn of Spinal Cord Gray Matter on Gastrocnemius Contractility in Toad. Zoological Research, 2010, 31(1): 94-98. doi: 10.3724/SP.J.1141.2010.01094

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