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The Rho kinase inhibitor fasudil attenuates Aβ1–42-induced apoptosis via the ASK1/JNK signal pathway in primary cultures of hippocampal neurons

Abstract

Alzheimer’s disease (AD), a chronic, progressive, neurodegenerative disorder, is the most common type of dementia. Beta amyloid (Aβ) peptide aggregation and phosphorylated tau protein accumulation are considered as one of the causes for AD. Our previous studies have demonstrated the neuroprotective effect of the Rho kinase inhibitor fasudil, but the mechanism remains elucidated. In the present study, we examined the effects of fasudil on Aβ1–42 aggregation and apoptosis and identified the intracellular signaling pathways involved in these actions in primary cultures of mouse hippocampal neurons. The results showed that fasudil increased neurite outgrowth (52.84%), decreased Aβ burden (46.65%), Tau phosphorylation (96.84%), and ROCK-II expression. In addition, fasudil reversed Aβ1–42-induced decreased expression of Bcl-2 and increases in caspase-3, cleaved-PARP, phospho-JNK(Thr183/Tyr185), and phospho-ASK1(Ser966). Further, fasudil decreased mitochondrial membrane potential and intracellular calcium overload in the neurons treated with Aβ1–42. These results suggest that inhibition of Rho kinase by fasudil reverses Aβ1–42-induced neuronal apoptosis via the ASK1/JNK signal pathway, calcium ions, and mitochondrial membrane potential. Fasudil could be a drug of choice for treatment of Alzheimer’s disease.

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Funding

This work was supported by research grants from the National Natural Science Foundation of China (No. 81272163 and 81,371,414 to C-GM), the Department of Science and Technology, Shanxi Province of China (201803D421073 to YY, 201803D31079 to NPZ, 201805D111009 to CGM, 201805D131005 to JZY), Datong Municipal Science and Technology Bureau (2,017,134 to YY, 2019152 to NPZ, 2019072 to YG, 2019198 to C-GM), PhD Initiation Grant of Datong University (2016-B-01 to YY, 2018-B-01 to YG), Key Discipline of Internal Medicine Grant of Datong University (100,201 to NPZ)and the Open Project of State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China (2018-MDB-KF-07 to YY).

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YG, YY, QLF designed the study, carried out the primary neuron cell tests, immunoassays and western blotting. CGM, HTZ and YY conceived the study, participated in its design and coordination and helped draft the manuscript. NZ, GK participated in its design and revised the manuscript. HTZ revised and finalized the manuscript. JHZ and LHZ participated in the statistical analysis. LJS and JZY participated in figures revision, statistics and text revision. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Yuqing Yan, Han-Ting Zhang or Cun-Gen Ma.

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The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Gao, Y., Yan, Y., Fang, Q. et al. The Rho kinase inhibitor fasudil attenuates Aβ1–42-induced apoptosis via the ASK1/JNK signal pathway in primary cultures of hippocampal neurons. Metab Brain Dis 34, 1787–1801 (2019). https://doi.org/10.1007/s11011-019-00487-0

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  • DOI: https://doi.org/10.1007/s11011-019-00487-0

Keywords

  • Fasudil
  • Rho kinase
  • 1–42
  • Apoptosis
  • JNK
  • Neurons
  • Alzheimer’s disease