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2015 ; 8
(4
): 5004-9
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Analgesic effects of melatonin on post-herpetic neuralgia
#MMPMID26131073
Deng YK
; Ding JF
; Liu J
; Yang YY
Int J Clin Exp Med
2015[]; 8
(4
): 5004-9
PMID26131073
show ga
OBJECTIVE: This study aims to explore the analgesic effects of melatonin on
post-herpetic neuralgia and its possible mechanism. METHODS: A total of 48 PHN
Wistar rats were divided into 4 groups randomly: Normal, PHN, PHN+MT and
naloxone, 4P-PDOT or L-arginine+120 mg/kg MT (C). Heat pain latency was
determined after MT injection for 20 min, 40 min, 80 min and 120 min
respectively. The expression levels of ? receptor and MT2 receptor in different
tissues of rats were detected by RT-PCR method. NO content was determined.
RESULTS: Heat pain latency in PHN rats were lower than that of control group
(P<0.05), MT could increase the heat pain latency with dose-dependent, while
naloxone, 4P-PDOT and L-arginine could reverse the analgesic effect of MT
(P<0.05). The expression levels of ? receptor and MT2 receptor in spinal cord,
hypothalamus and hippocampus in PHN+MT (120 mg/kg, i. p.) group were
significantly higher than that of PHN group (P<0.05). The NO levels in the brain
and spinal cord tissues in PHN group were higher than that of PHN+MT (120 mg/kg)
group (P<0.05). CONCLUSIONS: MT had significant analgesic effects in the
treatment of PHN, and its mechanism was closely related with ?opioid receptor, NO
and MT2 receptor.