Metallopeptidase inhibition potentiates bradykinin-induced hyperalgesia.

Metallopeptidase inhibition potentiates bradykinin-induced hyperalgesia.
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DOI:
10.1016/j.pain.2011.02.044
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发表时间:
2011-07
期刊:
影响因子:
7.4
通讯作者:
Jeske NA
Jeske NA
中科院分区:
医学1区
文献类型:
--
作者:
Gomez R;Por ED;Berg KA;Clarke WP;Glucksman MJ;Jeske NA

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神经肽缓激肽(BK)在炎性损伤时释放后可敏化伤害性感受器的激活。此后,缓激肽的生物活性由循环多肽酶的活性控制。金属内肽酶EC3.4.24.15(EP24.15)就是这样一种酶,它与缓激肽受体在初级传入神经元中共表达。在这项研究中,我们利用药理学、生物化学、细胞生物学和行为动物模型等方法,发现EP24.15和与之密切相关的EP24.16在调节缓激肽介导的痛觉过敏中起着至关重要的作用。药理分析表明,EP24.15和EP24.16抑制可显著增强原代培养的三叉神经节培养中缓激肽对缓激肽2型受体的激活作用。此外,在EP24.15/16抑制剂JA-2存在下,缓激肽对TRPV1激活的敏化作用增加。此外,行为学分析表明,JA-2和缓激肽介导的热痛敏之间存在显著的剂量-反应关系。这些结果表明,金属肽酶EP24.15和EP24.16在调节缓激肽介导的初级传入伤害性感受器的敏化过程中起着重要的生理作用。
The neuropeptide bradykinin (BK) sensitizes nociceptor activation following its release in response to inflammatory injury. Thereafter, the bioactivity of bradykinin is controlled by the enzymatic activities of circulating peptidases. One such enzyme, the metalloendopeptidase EC3.4.24.15 (EP24.15), is co-expressed with bradykinin receptors in primary afferent neurons. In this study, utilizing approaches encompassing pharmacology, biochemistry, cell biology and behavioral animal models, we discover a crucial role for EP24.15 and the closely-related EP24.16 in modulating bradykinin-mediated hyperalgesia. Pharmacological analyses indicate that EP24.15 and EP24.16 inhibition significantly enhances bradykinin type-2 receptor activation by bradykinin in primary trigeminal ganglia cultures. In addition, bradykinin-induced sensitization of TRPV1 activation is increased in the presence of the EP24.15/16 inhibitor JA-2. Furthermore, behavioral analyses illustrate a significant dose-response relationship between JA-2 and bradykinin-mediated thermal hyperalgesia. These results indicate an important physiological role for the metallopeptidases EP24.15 and EP24.16 in regulating bradykinin-mediated sensitization of primary afferent nociceptors.
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