中国神经再生研究(英文版) ›› 2026, Vol. 21 ›› Issue (10): 5044-5050.doi: 10.4103/NRR.NRR-D-24-01102

• 原著:视神经损伤修复保护与再生 • 上一篇    下一篇

多聚ADP核糖聚合酶调控rd1小鼠视网膜变性

  

  • 出版日期:2026-10-15 发布日期:2026-06-15

Poly(ADP-ribose) polymerase regulates transient receptor potential channel M2-dependent calpain activation in rd1 mouse retinal degeneration

Jie Yan1, 2, #, Lei Kong1, #, Zhijian Zhao3, Qianlu Yang4, Lan Wang2, Qianxi Yang4, Christian Harteneck5, †, Kangwei Jiao1, Zhulin Hu1, François Paquet-Durand2, *   

  1. 1Yunnan Eye Institute & Key Laboratory of Yunnan Province, Yunnan Eye Disease Clinical Medical Center, Affiliated Hospital of Yunnan University, Yunnan University, Kunming, Yunnan Province, China; 
    2Cell Death Mechanism Group, Institute for Ophthalmic Research, University of Tübingen, Tübingen, Germany; 
    3High-resolution Functional Imaging and Test Group, Institute for Ophthalmic Research, University of Tübingen, Tübingen, Germany; 
    4The Third Affiliated Hospital of Kunming Medical University &Yunnan Cancer Hospital, Kunming, Yunnan Province, China; 
    5Department of Pharmacology and Experimental Therapy, Institute of Experimental and Clinical Pharmacology and Toxicology, University of Tübingen, Tübingen, Germany
  • Online:2026-10-15 Published:2026-06-15
  • Contact: François Paquet-Durand, PhD, francois.paquet-durand@uni-tuebingen.de.
  • Supported by:
    This study was supported by the Medical Leading Talents Training Program of Yunnan Provincial Health Commission, No. L-2019029 (to ZH); the Yunnan Provincial Health Commission Clinical Medicine Center Research Project, Nos. 2024YNLCYXZX0326,  2024YNLCYXZX0339 (both to JY); the Yunnan Fundamental Research Kunming Medical University Projects, No. 202501AY070001-217 (to JY); the Yunnan University Medical Research Foundation, No. YDYXJJ2025-0056 (to JY); Key Project of Yunnan Fundamental Research Projects, No. 202301AS070046 (to KJ); the Charlotte and Tistou Kerstan Foundation (to FPD); and the Zinke Heritage Foundation (to FPD).

摘要:

遗传性视网膜变性是指以进行性感光细胞丧失为特征的不可治愈性致盲性疾病。视细胞变性常伴随多聚ADP核糖聚合酶及钙离子依赖性钙蛋白酶过度活化。为探究多聚ADP核糖聚合酶与钙蛋白酶活性的相互作用,我们采用野生型小鼠及遗传性视网膜变性rd1小鼠模型建立的类器官视网膜组织培养体系。视网膜组织分别接受多聚ADP核糖聚合酶抑制剂INO1001或奥拉帕尼、多聚ADP核糖水解酶抑制剂JA2131、瞬时受体电位通道M2阻断剂8-Br-ADPR处理。读数包括用于检测细胞死亡的TUNEL检测、组蛋白去乙酰化酶、多聚ADP核糖聚合酶和钙蛋白酶的原位活性检测,以及活化钙蛋白酶-2和聚(ADP-核糖)的免疫染色。多聚ADP核糖聚合酶、多聚ADP核糖水解酶和瞬时受体电位通道M2的抑制降低了钙蛋白酶的活性和钙蛋白酶-2的激活。多聚ADP核糖聚合酶活性在多聚ADP核糖聚合酶抑制剂和瞬时受体电位通道M2抑制剂作用下降低,但多聚ADP核糖水解酶抑制未产生此效应。值得注意的是,多聚ADP核糖聚合酶抑制剂INO1001显著增强组蛋白去乙酰化酶活性,此作用与其他化合物不同。当INO1001与聚(ADP-核糖)糖苷酶抑制剂JA2131联合使用时,以协同方式减少了感光细胞死亡,尽管在钙蛋白酶或多聚ADP核糖聚合酶活性方面未观察到此类协同作用。此外,JA2131与多聚ADP核糖聚合酶抑制剂奥拉帕尼联合使用时,未观察到协同性视细胞保护作用。总体而言,这些结果表明在rd1视细胞中,多聚ADP核糖聚合酶通过多聚ADP核糖水解酶和瞬时受体电位通道M2诱导的Ca2+内流调控钙蛋白酶活性。我们还发现INO1001在治疗遗传性视网膜变性方面可能比奥拉帕尼更具优势。本研究揭示了视网膜感光细胞中多聚ADP核糖聚合酶信号传导的复杂性,并确定多聚ADP核糖水解酶和瞬时受体电位通道M2可作为遗传性视网膜变性治疗开发的新靶点。


https://orcid.org/0000-0001-7355-5742 (François Paquet-Durand)
 

关键词: Ca2?, 钙通道, 环鸟苷单磷酸, PARthanatos, 多聚ADP核糖聚合酶2, 视网膜色素变性

Abstract: Inherited retinal degeneration refers to untreatable blinding diseases characterized by progressive photoreceptor loss. Photoreceptor degeneration is often associated with an excessive activation of poly(ADP-ribose) polymerase and Ca2+-dependent calpain-type proteases. To explore the interplay between poly(ADP-ribose) polymerase and calpain activity, we employed organotypic retinal explant cultures derived from wild-type mice and from the rd1 mouse model for inherited retinal degeneration. Retinae were treated with the poly(ADP-ribose) polymerase inhibitors INO1001 or Olaparib, the poly(ADP-ribose) glycohydrolase inhibitor JA2131, or the transient receptor potential channel M2 blocker 8-Br-ADPR. Readouts included the terminal deoxynucleotidyl transferase dUTP nick end labeling assay to detect cell death, in situ activity assays for histone-deacetylases, poly(ADP-ribose) polymerase, and calpain, as well as immunostaining for activated calpain-2, and poly(ADP-ribose). Poly(ADP-ribose) polymerase, poly(ADP-ribose) glycohydrolase, and transient receptor potential channel M2 inhibition reduced calpain activity and calpain-2 activation. Poly(ADP-ribose) polymerase activity was decreased by poly(ADP-ribose) polymerase and transient receptor potential channel M2 inhibitors but not by poly(ADP-ribose) glycohydrolase inhibition. Remarkably, the poly(ADP-ribose) polymerase inhibitor INO1001 increased histone-deacetylase activity unlike any of the other compounds. When combined with the poly(ADP-ribose) glycohydrolase inhibitor JA2131, INO1001 reduced photoreceptor cell death in a synergistic fashion, although such synergy was not observed for calpain or poly(ADP-ribose) polymerase activity. Moreover, synergistic photoreceptor preservation was not observed when JA2131 was combined with the poly(ADP-ribose) polymerase inhibitor Olaparib. Overall, these results indicate that in rd1 photoreceptors, poly(ADP-ribose) polymerase controls calpain activity via poly(ADP-ribose) glycohydrolase and transient receptor potential channel M2-induced Ca2+ influx. We also characterized INO1001 as potentially more beneficial for inherited retinal degeneration treatment than Olaparib. Our study details the complexity of poly(ADP-ribose) polymerase-signaling in photoreceptors and identifies poly(ADP-ribose) glycohydrolase and transient receptor potential channel M2 as new targets for inherited retinal degeneration therapy development.

Key words: Ca2+, calcium channels, cyclic-guanosine-monophosphate (cGMP), PARthanatos, poly(ADP-ribose) polymerase-2 (PARP-2), retinitis pigmentosa