Modulation effects of cordycepin on the skeletal muscle contraction of toad gastrocnemius muscle.
Isolated toad gastrocnemius muscle is a typical skeletal muscle tissue that is frequently used to study the motor system because it is an important component of the motor system. This study investigates the effects of cordycepin on the skeletal muscle contractile function of isolated toad gastrocnemius muscles by electrical field stimulation. Results showed that cordycepin (20 mg/l to 100 mg/l) significantly decreased the contractile responses in a concentration-dependent manner. Cordycepin (50 mg/l) also produced a rightward shift of the contractile amplitude-stimulation intensity relationship, as indicated by the increases in the threshold stimulation intensity and the saturation stimulation intensity. However, the most notable result was that the maximum amplitude of the muscle contractile force was significantly increased under cordycepin application (122±3.4% of control). This result suggests that the skeletal muscle contractile function and muscle physical fitness to the external stimulation were improved by the decreased response sensitivity in the presence of cordycepin. Moreover, cordycepin also prevented the repetitive stimulation-induced decrease in muscle contractile force and increased the recovery amplitude and recovery ratio of muscle contraction. However, these anti-fatigue effects of cordycepin on muscle contraction during long-lasting muscle activity were absent in Ca2+-free medium or in the presence of all Ca2+ channels blocker (0.4 mM CdCl2). These results suggest that cordycepin can positively affect muscle performance and provide ergogenic and prophylactic benefits in decreasing skeletal muscle fatigue. The mechanisms involving excitation-coupled Ca2+ influxes are strongly recommended.
Li-Hua
LH
Yao
Wei
W
Meng
Rong-Feng
RF
Song
Qiu-Ping
QP
Xiong
Wei
W
Sun
Zhi-Qiang
ZQ
Luo
Wen-Wen
WW
Yan
Yu-Ping
YP
Li
Xin-Ping
XP
Li
Hai-Hang
HH
Li
Peng
P
Xiao
D000818:Animals; D001001:Anura; D019256:Cadmium Chloride / Q000494:pharmacology; D003839:Deoxyadenosines / Q000494:pharmacology*; D004558:Electric Stimulation; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000187:drug effects*; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000502:physiology*; D010805:Physical Conditioning, Animal
D003839:Deoxyadenosines; C058120:cordycepin; D019256:Cadmium Chloride