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1997年3月,77 (3):1566 - 80。
doi: 10.1152 / jn.1997.77.3.1566。

阿片类药物对mechanosensitive盆腔神经传入纤维的影响支配膀胱的老鼠

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阿片类药物对mechanosensitive盆腔神经传入纤维的影响支配膀胱的老鼠

X苏et al。 J Neurophysiol 1997年3月
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文摘

共有443个盆腔神经传入纤维中鉴定出16种鼠背根盆腔神经电刺激;319名(72%)有髓纤维δ平均传导速度(CV) 11.8 m / s, 124(28%)无髓鞘的C纤维指的是简历的1.9 m / s。二百五十二纤维(57%)对有毒膀胱膨胀(钻井;80毫米汞柱);108 C纤维(意味着简历;144年1.9 m / s)和三角洲纤维(意味着简历;8.2米/秒)。49 UBD-sensitive纤维进一步特征;都给了单调增加发射增加向外的压力。36个纤维(73%)有一个低门槛(LT)响应(意思是:6毫米汞柱)和13纤维(27%)门槛过高(HT)响应(意思是:32毫米汞柱)。 Responses of 15 fibers to graded UBD (11 LT and 4 HT) were tested before and after instillation of 0.5 ml of 30% xylenes (n = 11) or 5% mustard oil (n = 4) into the bladder. The mean resting activity of 13 fibers significantly increased, and 7 fibers exhibited sensitization of responses to graded UBD 30 min after xylenes or mustard oil instillation. All 4 HT fibers were sensitized; 3 of the 11 LT fibers were sensitized (i.e., gave increased responses to UBD). The effects of opioid receptor agonists were tested on responses to noxious UBD (80 mmHg). Cumulative intraarterial doses of mu-opioid receptor agonists (morphine, 8 mg/kg, and fentanyl, 300 micrograms/kg) and of delta-opioid receptor agonists (DPDPE, 300 micrograms/kg, and SNC-80, 300 micrograms/kg) did not affect responses to noxious UBD. In contrast, cumulative 16 mg/kg intraarterial doses of the kappa-opioid receptor agonists U50,488H, U69,593 and U62,066 dose-dependently attenuated responses to noxious UBD. There were no differences in the dose-response relationships of these drugs on afferent fibers from untreated and xylenes- or mustard oil-treated urinary bladder. These results reveal that there is a greater proportion of UBD-sensitive fibers in the L6 dorsal root (57%) than in the S1 dorsal root of the rat (38%; a previous study). The attenuation of responses to UBD by kappa, but not mu or delta opioid receptor agonists suggests a potential use for peripherally acting kappa opioid receptor agonists in the control of urinary bladder pain.

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