TY - JOUR T1 - Effect of Food Deprivation on Formalin-Induced Nociceptive Behaviors and Beta-Endorphin and Sex Hormones Concentration in Rats TT - اثرات محرومیت غذایی بر رفتارهای دردی ناشی از فرمالین و غلظت بتااندورفین و هورمون های جنسی در موش های صحرایی JF - انستیتو-پاستور-ایران JO - انستیتو-پاستور-ایران VL - 18 IS - 2 UR - http://ibj.pasteur.ac.ir/article-1-1132-en.html Y1 - 2014 SP - 107 EP - 113 KW - Rat KW - Food Deprivation KW - beta-endorphin KW - Naloxone N2 - Background: The present study examined the possible role of endogenous opioidergic system in effect of food deprivation on formalin-induced nociceptive behaviors in male and female rats. Also, we investigated the effect of food deprivation on the plasma level of beta-endorphin and sex hormones. Methods: Food was withdrawn 48 h prior to performing the formalin test, but water continued to be available ad libitum. The formalin was injected into hind plantar paw. Results: There is significant difference between male and female control rats during phase 2B. Following 48-h food deprivation, both male and female rats exhibited enhanced nociceptive behavior in response to formalin. Food deprivation for 12 and 24 h increased and for 48 h decreased beta-endorphin level in male and female rats. Food deprivation for 24 h decreased testosterone level in male, while it had no significant effect on female rats and food deprivation for 48 h decreased testosterone level in both sexes. Food deprivation for 24 h increased estradiol level in female and that for 48 h had no significant effect on male and female rats. Conclusions: The present study demonstrates the existence of food deprivation for 48 h causes enhancement of nociception in the formalin test in male and female rats that has correlation with decrease in plasma beta-endorphin and testosterone levels. M3 10.6091/ibj.12122.2014 ER -