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Stress Conditions Increase Vimentin Cleavage by Omi/HtrA2 Protease in Human Primary Neurons and Differentiated Neuroblastoma Cells

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Abstract

Dysfunctional Omi/HtrA2, a mitochondrial serine protease, has been implicated in various neurodegenerative disorders. Despite the wealth of evidence on the roles of Omi/HtrA2 in apoptosis, little is known about its cytosolic targets, the cleavage of which could account for the observed morphological changes such as cytoskeletal reorganizations in axons. By proteomic analysis, vimentin was identified as a substrate for Omi/HtrA2 and we have reported increased Omi/HtrA2 protease activity in Alzheimer disease (AD) brain. Here, we investigated a possible link between Omi/HtrA2 and vimentin cleavage, and consequence of this cleavage on mitochondrial distribution in neurons. In vitro protease assays showed vimentin to be cleaved by Omi/HtrA2 protease, and proximity ligation assay demonstrated an increased interaction between Omi/HtrA2 and vimentin in human primary neurons upon stress stimuli. Using differentiated neuroblastoma SH-SY5Y cells, we showed that Omi/HtrA2 under several different stress conditions induces cleavage of vimentin in wild-type as well as SH-SY5Y cells transfected with amyloid precursor protein with the Alzheimer disease-associated Swedish mutation. After stress treatment, inhibition of Omi/HtrA2 protease activity by the Omi/HtrA2 specific inhibitor, Ucf-101, reduced the cleavage of vimentin in wild-type cells. Following altered vimentin filaments integrity by stress stimuli, mitochondria was redistributed in differentiated SH-SY5Y cells and human primary neurons. In summary, the findings outlined in this paper suggest a role of Omi/HtrA2 in modulation of vimentin filamentous structure in neurons. Our results provide important findings for understanding the biological role of Omi/HtrA2 activity during stress conditions, and give knowledge of interplay between Omi/HtrA2 and vimentin which might affect mitochondrial distribution in neurons.

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Acknowledgments

This research was funded by grants from Gun och Bertil Stohnes foundation, Alzheimer foundation, Gamla Tjänarinnor Stiftelse, Karolinska Institutet foundation, and Olle Engkvist Byggmästare Stiftelse. The authors would like to thank Dr. Anna Sandebring and Dr. Paula Merino for excellent methodological advises, and Dr. Taher Darreh-Shori and Dr. Pavel Pavlov for critical reading of this manuscript.

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The authors declare that they have no conflict of interest.

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  1. Karolinska Institutet, Department of Neurobiology, Care Sciences and Society (NVS), Center for Alzheimer Research, Division for Neurogeriatrics, Novum 5th floor, SE-141 57, Huddinge, Sweden

    Bérangère Lucotte, Mehdi Tajhizi, Dareen Alkhatib, Eva-Britt Samuelsson, Birgitta Wiehager, Sophia Schedin-Weiss, Erik Sundström, Bengt Winblad, Lars.O Tjernberg & Homira Behbahani

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  1. Bérangère Lucotte
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  2. Mehdi Tajhizi
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Correspondence to Homira Behbahani.

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Lucotte, B., Tajhizi, M., Alkhatib, D. et al. Stress Conditions Increase Vimentin Cleavage by Omi/HtrA2 Protease in Human Primary Neurons and Differentiated Neuroblastoma Cells. Mol Neurobiol 52, 1077–1092 (2015). https://doi.org/10.1007/s12035-014-8906-3

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