蛋白酪氨酸磷酸酶 SHP-2在Ⅰ型代谢型谷氨酸受体诱发痛觉超敏中的作用

摘要

Aim To investigate whether the pain modi-fication by group I metabotropic glutamate receptors (mGluRs)required the involvement of Src homology-2 domain-containing phosphatase-2 (SHP-2 ).Methods Co-immunoprecipitation was performed to examine the possible interaction between SHP-2 and group I mGluRs in spinal cord dorsal horn of mice.By measur-ing the paw withdrawal thresholds,the effects of SHP-2 inhibitor NSC-87877 or its catalytically inactive SHP-2 (C459S ) mutant on allodynia induced by group I mGluRs agonist DHPG (50 nmol)were observed.Re-sults Anti-mGluR5 antibody was able to co-immuno-precipitate SHP-2 from spinal dorsal horn of mice, while no SHP-2 was precipitated by anti-mGluR1 anti-body.Inactivation of SHP-2 by NSC-87877 (6 nmol) or SHP-2 (C459S ) effectively attenuated allodynia caused by DHPG.Conclusion SHP-2 can physically interact with mGluR5.The activation of SHP-2 may be necessary for group I mGluRs to process the nocicep-tive information.%目的：探讨Ⅰ型代谢型谷氨酸受体（mGluRs）的痛觉调制作用与蛋白酪氨酸磷酸酶 SHP-2（Src homology-2 do-main-containing phosphatase-2）的关系。方法以免疫共沉淀法，研究小鼠脊髓背角 SHP-2与Ⅰ型 mGluRs 之间的相互作用；通过测定缩足阈值，观察 SHP-2抑制剂 NSC-87877或SHP-2的无活性突变体 SHP-2（C459S）对Ⅰ型 mGluRs 激动剂 DHPG （50 nmol）诱发的痛觉超敏的影响。结果抗mGluR5的特异性抗体，能够从脊髓背角中免疫共沉淀 SHP-2，而抗 mGluR1的特异性抗体则无法沉淀出 SHP-2；以 NSC-87877（6 nmol）或 SHP-2（C459S）抑制 SHP-2的活性，可有效缓解 DHPG 诱发的痛觉超敏。结论SHP-2与 mGluR5存在分子间的相互结合，SHP-2的激活可能参与Ⅰ型 mGluRs 的痛觉调制过程。