GPI-1046 protects dorsal root ganglia from gp120-induced axonal injury by modulating store-operated calcium entry.

GPI-1046 protects dorsal root ganglia from gp120-induced axonal injury by modulating store-operated calcium entry.
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DOI:
10.1111/j.1529-8027.2009.00203.x
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发表时间:
2009-03
期刊:
Journal of the peripheral nervous system : JPNS
影响因子:
--
通讯作者:
Haughey NJ
Haughey NJ
中科院分区:
其他
文献类型:
--
作者:
Höke A;Morris M;Haughey NJ

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大部分 HIV 感染患者都会出现人类免疫缺陷病毒 (HIV) 相关感觉神经病 (HIV-SN)。包括外壳蛋白 gp120 在内的病毒成分被认为会对背根神经节 (DRG) 感觉神经元产生毒性作用,而用一些抗逆转录病毒药物治疗 HIV 感染可能会进一步加剧这种毒性作用。在 HIV-SN 的组织培养模型中,我们发现用亲免素配体 GPI-1046 治疗可以预防 gp120 诱导的 DRG 感觉神经元轴突变性。 Gp120 诱导 DRG 神经元内质网 (ER) 钙快速大量释放,但通过 GPI-1046 处理可减弱这种作用。进一步的实验表明,GPI-1046 通过减少钙库操作 (SOC) 的进入来降低内质网总钙负荷。总之,这些结果表明,GPI-1046 通过减少钙通过 SOC 的进入,从而减少 gp120 可释放的 ER 钙总量,从而保护 DRG 免受 gp120 诱导的轴突损伤。
Human immunodeficiency virus (HIV)–associated sensory neuropathy (HIV-SN) occurs in a large fraction of patients infected with HIV. Viral components, including the coat protein gp120, are thought to exert toxic actions on dorsal root ganglia (DRG) sensory neurons that can be further exacerbated by treatment of HIV infection with some antiretroviral agents. In a tissue culture model of HIV-SN, we found that gp120-induced axonal degeneration in DRG sensory neurons was prevented by treatment with the immunophilin ligand GPI-1046. Gp120 induced a rapid and large release of endoplasmic reticulum (ER) calcium in DRG neurons that was attenuated by treatment with GPI-1046. Further experiments suggested that GPI-1046 reduced the total ER calcium load by attenuating store-operated calcium (SOC) entry. Together, these results suggest that GPI-1046 protects DRG from gp120-induced axonal damage by decreasing the entry of calcium through SOC, thus reducing the total volume of ER calcium that is available to be released by gp120.
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