Huntingtin-Associated Protein 1A Regulates Store-Operated Calcium Entry in Medium Spiny Neurons From Transgenic YAC128 Mice, a Model of Huntington's Disease

Magdalena Czeredys; Vladimir A Vigont; Vasilisa A Boeva; Katsuhiko Mikoshiba; Elena V Kaznacheyeva; Jacek Kuznicki

doi:10.3389/fncel.2018.00381

Huntingtin-Associated Protein 1A Regulates Store-Operated Calcium Entry in Medium Spiny Neurons From Transgenic YAC128 Mice, a Model of Huntington's Disease

Front Cell Neurosci. 2018 Oct 26:12:381. doi: 10.3389/fncel.2018.00381. eCollection 2018.

Authors

Magdalena Czeredys¹, Vladimir A Vigont², Vasilisa A Boeva², Katsuhiko Mikoshiba³, Elena V Kaznacheyeva², Jacek Kuznicki¹

Affiliations

¹ Laboratory of Neurodegeneration, International Institute of Molecular and Cell Biology in Warsaw (IIMCB), Warsaw, Poland.
² Institute of Cytology, Russian Academy of Sciences (RAS), St. Petersburg, Russia.
³ Laboratory for Developmental Neurobiology, RIKEN Brain Science Institute (BSI), Saitama, Japan.

Abstract

Huntington's disease (HD) is a hereditary neurodegenerative disease that is caused by polyglutamine expansion within the huntingtin (HTT) gene. One of the cellular activities that is dysregulated in HD is store-operated calcium entry (SOCE), a process by which Ca²⁺ release from the endoplasmic reticulum (ER) induces Ca²⁺ influx from the extracellular space. HTT-associated protein-1 (HAP1) is a binding partner of HTT. The aim of the present study was to examine the role of HAP1A protein in regulating SOCE in YAC128 mice, a transgenic model of HD. After Ca²⁺ depletion from the ER by the activation of inositol-(1,4,5)triphosphate receptor type 1 (IP₃R1), we detected an increase in the activity of SOC channels when HAP1 protein isoform HAP1A was overexpressed in medium spiny neurons (MSNs) from YAC128 mice. A decrease in the activity of SOC channels in YAC128 MSNs was observed when HAP1 protein was silenced. In YAC128 MSNs that overexpressed HAP1A, an increase in activity of IP₃R1 was detected while the ionomycin-sensitive ER Ca²⁺ pool decreased. 6-Bromo-N-(2-phenylethyl)-2,3,4,9-tetrahydro-1H-carbazol-1-amine hydrochloride (C₂₀H₂₂BrClN₂), identified in our previous studies as a SOCE inhibitor, restored the elevation of SOCE in YAC128 MSN cultures that overexpressed HAP1A. The IP₃ sponge also restored the elevation of SOCE and increased the release of Ca²⁺ from the ER in YAC128 MSN cultures that overexpressed HAP1A. The overexpression of HAP1A in the human neuroblastoma cell line SK-N-SH (i.e., a cellular model of HD (SK-N-SH HTT138Q)) led to the appearance of a pool of constitutively active SOC channels and an increase in the expression of STIM2 protein. Our results showed that HAP1A causes the activation of SOC channels in HD models by affecting IP₃R1 activity.

Keywords: 4; 5)triphosphate receptor type 1; Huntington’s disease; YAC128; huntingtin; huntingtin-associated protein 1 isoform A; inositol-(1; medium spiny neurons; store-operated calcium entry; tetrahydrocarbazole.