Basic and Clinical Neuroscience Journal
مجله علوم اعصاب پایه و بالینی
BCN
Medical Sciences
http://bcn.iums.ac.ir
137
journal137
2008-126X
2228-7442
10.32598/bcn
en
jalali
1390
7
1
gregorian
2011
10
1
3
1
online
1
fulltext
en
Contribution of the Nucleus Cuneiformis to the Antinociceptive Effects of Systemic Morphine on Inflammatory Pain in Rats
Clinical Neuroscience
Clinical Neuroscience
Original
Original
<p align="left" ><font color="#221e1f" size="2"><font color="#221e1f" size="2"><p align="left" ><p><strong><font color="#221e1f" size="2"><font color="#221e1f" size="2">Introduction: </font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">The role of midbrain reticular formation, which includes the nucleus cuneiformis (NCF), as a crucial antinociceptive region in descending pain modulation has long been investigated. In this study, we tried to highlight the role of NCF in morphine-induced antinociception in formalin-induced pain model in rats. </font></font></font></strong><font color="#221e1f" size="2"><font color="#221e1f" size="2"><p align="justify"><strong>Methods: </strong></p></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">A total of 201 male Wistar rats weighing 260-310 g were used in this study. The effective dose of morphine in systemic administration (intraperitoneal i.p.) was determined after a dose- and time-response protocol. In consequent </font></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">groups, bilateral electrolytic lesion (500 μA, 30 sec) or reversible inactivation </font></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">(lidocaine 2%) were used in the NCF before systemic administration of morphine, and then, the nociceptive test was immediately carried out. </font></font></font><font color="#221e1f" size="2"><font color="#221e1f" size="2"><p align="justify"><strong>Results: </strong></p></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">The results showed that administration of 6 mg/kg morphine, 30 min before the formalin test, is the best dose- and time-response set in these experiments. The obtained data also indicated that bilateral electrical destruction </font></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">or reversible inactivation of the NCF significantly decreased antinociceptive </font></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">responses of systemic morphine (6 mg/kg i.p.) during the second phase of formalin test (P<0.05). </font></font></font><font color="#221e1f" size="2"><font color="#221e1f" size="2"><p><strong>Discussion: </strong></p></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">Therefore, it seems that opioid receptors located in the NCF may be </font></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">involved in modulation of central sensitization which occurred in inflammatory </font></font></font><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2"><font color="#221e1f" face="Times New Roman,Times New Roman" size="2">pain in rats. </font></font></font></p></font></font>
Nucleus Cuneiformis,Electrolytic Lesion,Reversible Inactivation,Morphine,Formalin Test,Rat.
35
43
http://bcn.iums.ac.ir/browse.php?a_code=A-10-1-89&slc_lang=en&sid=1
Abdolaziz
Ronaghi
1370031947532846001444
1370031947532846001444
Yes
Mohammad
Ebrahimzadeh
1370031947532846001445
1370031947532846001445
No
Abbas
Haghparast
1370031947532846001446
1370031947532846001446
No