Local Peripheral Effects of <i>β</i>-Caryophyllene through CB₂Receptors in Neuropathic Pain in Mice

β-Caryophyllene (BCP) is known as a common constitute of the essential oils of numerous food plants and primary component in Cannabis. In this study, we investigated the effect of local intraplantar (i.pl.) injection of BCP on mechanical hypersensitivity induced by partial sciatic nerve ligation (PSNL) in mice. Relative to sham operation controls, mice with the PSNL displayed a maximum level of hyperresponsiveness to von Frey metallic filament on post-operative day 7. PSNL-induced allodynia was seen in the ipsilateral side of nerve ligation, but not in the contralateral side. The i.pl. injection of BCP into the ipsilateral hindpaw to PSNL attenuated mechanical allodynia in a dose-dependent manner. BCP injection into the contralateral hindpaw did not produce anti-allodynic effects, suggesting a local peripheral anti-allodynic effect of BCP. Anti-allodynic effects induced by i.pl. injection of BCP were prevented by pretreatment with the cannabinoid (CB2) receptor antagonist AM630, but not by the CB1 receptor antagonist AM251. These data suggest that i.pl. injection of BCP could produce anti-allodynia by activating peripheral CB2 receptors, but not CB1 receptors in a mouse model of neuropathic pain. Taken together, these results suggest that peripheral CB2 receptors may contribute to the effectiveness of BCP in the treatment of neuropathic pain disorders.

原发性急性闭角型青光眼患者房水NO、SOD和MDA水平的检测及其临床意义

目的 :观察原发性急性闭角型青光眼 (PAACG)患者房水的一氧化氮 (NO)、脂质过氧化产物丙二醛 (MDA)和超氧化物歧化酶(SOD)水平及其临床意义。方法 :采用配对设计进行分组 ,2 7例患者的急性发作眼为发作组 ,同一患者的另外一只未发作眼为对照组。用分光光度计检测两组房水 NO、MDA的含量和 SOD的活性。结果 :两组比较 ,PAACG组的 NO与 MDA非常显著高于对照组 (Ρ<0 .0 1 ) ,而SOD显著下降 (Ρ <0 .0 1 )。结论 :眼压升高可能导致 PAACG患者房水 NO与 MDA明显升高 ,而 SOD非常显著下降 ,导致损伤小梁网及邻近的葡萄膜和视网膜 ,促进了青光眼的高眼压及视神经病变的发展。