Naloxone potentiates treadmill running-induced increase in c-Fos expression in rat hippocampus.
The expression of c-Fos is induced by a variety of stimuli and is sometimes used as a marker for increased neuronal activity. In the present study, the effect of treadmill running on c-Fos expression in the hippocampus and the involvement of opioid receptors were investigated via c-Fos immunohistochemistry. It was shown that c-Fos expression in the CA1 region, the CA2 and CA3 regions, and the dentate gyrus of the hippocampus was significantly increased by treadmill running and naloxone, a nonselective opioid receptors antagonist, treatment enhanced treadmill exercise-induced increase of hippocampal c-Fos expression. Base on the present results, it can be suggested that treadmill running increases hippocampal neuronal activity and that endogenous opioids curtail the exercise-induced increase.
Lee
Myoung-Hwa
MH
Research Institute of Sports Science, Korea University, #1 5-ga Anam-dong, Sungbuk-gu, Seoul 136-701, South Korea.
Kim
Hong
H
Lim
Baek-Vin
BV
Chang
Hyun-Kyung
HK
Lee
Taeck-Hyun
TH
Jang
Mi-Hyeon
MH
Shin
Min-Chul
MC
Lee
Jongseok
J
Shin
Mal-Soon
MS
Kim
Chang-Ju
CJ
D000818:Animals; D002452:Cell Count; D019084:Fluorescent Antibody Technique, Indirect; D006624:Hippocampus / Q000187:drug effects* / Q000378:metabolism; D007091:Image Processing, Computer-Assisted; D007124:Immunoenzyme Techniques; D008297:Male; D009043:Motor Activity / Q000187:drug effects* / Q000502:physiology; D009270:Naloxone / Q000494:pharmacology*; D009292:Narcotic Antagonists / Q000494:pharmacology*; D010805:Physical Conditioning, Animal; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley
D009292:Narcotic Antagonists; D016760:Proto-Oncogene Proteins c-fos; D009270:Naloxone