Dynamic determination and possible mechanism of amino acid transmitter release from rat spinal dorsal horn induced by the venom and a neurotoxin (BmK I) of scorpion Buthus martensi Karsch.
In the present communication, we determined the dynamic release of amino acid transmitters from spinal dorsal horn induced by scorpion Buthus martensi Karsch (BmK) venom and a neurotoxin (BmK I). The results found that glutamate and aspartate release could be evoked significantly within the initial 30 min with the applied doses of either 0.05 and 0.01 mg BmK venom or 0.01 and 0.002 mg BmK I. However, gamma-aminobutyric acid (GABA) release could be largely evoked during the second 30 min by the venom, but not by BmK I. The result suggested that nociceptive afferent fibers could be activated to induce excitatory amino acid release from spinal dorsal horn by nociceptive factors such as BmK I, but the delayed release of GABA might be attributed to the modulating role of some antinociceptive components in the venom.
Institute of Physiology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, PR China.
Xu-Ying
XY
Zhang
Jian-Wei
JW
Zhang
Bing
B
Chen
Zhan-Tao
ZT
Bai
Jun
J
Shen
Yong-Hua
YH
Ji
D000818:Animals; D001224:Aspartic Acid / Q000378:metabolism; D018698:Glutamic Acid / Q000378:metabolism; D008297:Male; D017551:Microdialysis; D018377:Neurotransmitter Agents / Q000378:metabolism*; D009619:Nociceptors / Q000187:drug effects* / Q000378:metabolism*; D010146:Pain / Q000139:chemically induced / Q000378:metabolism; D020671:Posterior Horn Cells / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012604:Scorpion Venoms / Q000494:pharmacology*; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
D018377:Neurotransmitter Agents; D012604:Scorpion Venoms; C105338:makatoxin I; D001224:Aspartic Acid; D018698:Glutamic Acid; D005680:gamma-Aminobutyric Acid