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In order to examine the effect of testosterone on antinociception and the role of opioid system as an underlying mechanism, thirty-seven adult female mice(Institute of Cancer Research) were randomized to Naloxone(n=18) and Control group(n=19). Testosterone propionate(1㎎/㎏, ip) with naloxone HCL(2㎎/㎏, ip) or with normal saline(5㎖/㎏, ip) was administered on the first and the third experimental days. Nociceptive sensitivity was measured by Tail flick test(TFL, sec) before and after injection on the first and the third experimental days. The same dose of testosterone was injected on the second experimental day.
The results were as follows;
1. TFL of control group was significantly increased by testosterone. TFL of control group measured on the first experimental day before and after injection were 5.5±1.1 sec(mean±sd) and 6.3±1.2 sec, respectively, and the change was significant(t=4.06, p=0.001). That measured on the third experimental day before injection was 5.9±1.0, showing a significant increase compared to that of the first experimental day(t=2.37, p=0.029).
2. Testosterone-induced antinociception was blocked by naloxone. In naloxone group, change in TFLs measured before(5.6±0.8) and after(5.3±0.9) injection was not significant on the first experimental day. On the third day, TFL measured before injection(6.6±1.2) was increased significantly than that of the first experimental day(t=2.87, p=0.011), but it decreased to baseline level after injection of naloxone(5.3±1.3; t=4.73, p=0.000).
From these results, it is suggested that testosterone has antinociceptive effect, which is mediated by endogenous opioid system.
The results were as follows;
1. TFL of control group was significantly increased by testosterone. TFL of control group measured on the first experimental day before and after injection were 5.5±1.1 sec(mean±sd) and 6.3±1.2 sec, respectively, and the change was significant(t=4.06, p=0.001). That measured on the third experimental day before injection was 5.9±1.0, showing a significant increase compared to that of the first experimental day(t=2.37, p=0.029).
2. Testosterone-induced antinociception was blocked by naloxone. In naloxone group, change in TFLs measured before(5.6±0.8) and after(5.3±0.9) injection was not significant on the first experimental day. On the third day, TFL measured before injection(6.6±1.2) was increased significantly than that of the first experimental day(t=2.87, p=0.011), but it decreased to baseline level after injection of naloxone(5.3±1.3; t=4.73, p=0.000).
From these results, it is suggested that testosterone has antinociceptive effect, which is mediated by endogenous opioid system.
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UCI(KEPA) : I410-ECN-0101-2009-513-017216325