Static magnetic field expose enhances neurotransmission in crayfish nervous system.
OBJECTIVE
To investigate the effects of static magnetic field (SMF) exposure on the synaptic transmission in a tail-flip circuit of crayfish.


METHODS
An O-shaped permanent magnet (35 mT intensity) was placed under the isolated nerve cord of crayfish to provide static magnetic field exposure. Using electrophysiological methods, the excitatory post synaptic potential (EPSP) before and after field exposure in the lateral giant interneuron were measured and compared.


RESULTS
The EPSP produced via electrical and chemical synapses in the lateral giant neuron were enhanced after 30 min of SMF exposure (8.08 mT). Perfusion of field-exposed crayfish bath solution or preloading of Ca(2+) chelator and intracellular Ca(2+) release blocker failed to observe the SMF-induced enhancement on EPSP.


CONCLUSIONS
Exposure of SMF increases the efficacy of synaptic-transmission in crayfish tail-flip escape circuit and this SMF-induced potentiation is a Ca(2+) dependent phenomenon.
Yeh
S R
SR
Institute of Molecular Medicine, National Tsing Hua University, Hsinchu, Taiwan. sryeh@life.nthu.edu.tw
Yang
J W
JW
Lee
Y T
YT
Tsai
L Y
LY
D000818:Animals; D003400:Astacoidea; D002118:Calcium / Q000378:metabolism / Q000528:radiation effects*; D002121:Calcium Channel Blockers / Q000494:pharmacology; D002614:Chelating Agents / Q000494:pharmacology; D004574:Electromagnetic Fields; D004594:Electrophysiology; D009420:Nervous System / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects*; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology / Q000528:radiation effects*; D013997:Time Factors
D002121:Calcium Channel Blockers; D002614:Chelating Agents; D002118:Calcium