Huntingtin and huntingtin-associated protein 1 influence neuronal calcium signaling mediated by inositol-(1,4,5) triphosphate receptor type 1

Tie Shan Tang, Huiping Tu, Edmond Y W Chan, Anton Maximov, Zhengnan Wang, Cheryl L. Wellington, Michael R. Hayden, Ilya Bezprozvanny

Research output: Contribution to journalArticle

346 Scopus citations

Abstract

Huntington's disease (HD) is caused by polyglutamine expansion (exp) in huntingtin (Htt). The type 1 inositol (1,4,5)-triphosphate receptor (InsP3R1) is an intracellular calcium (Ca2+) release channel that plays an important role in neuronal function. In a yeast two-hybrid screen with the InsP3R1 carboxy terminus, we isolated Htt-associated protein-1A (HAP1A). We show that an InsP3R1-HAP1A-Htt ternary complex is formed in vitro and in vivo. In planar lipid bilayer reconstitution experiments, InsP3R1 activation by InsP3 is sensitized by Httexp, but not by normal Htt. Transfection of full-length Httexp or caspase-resistant Httexp, but not normal Htt, into medium spiny striatal neurons faciliates Ca2+ release in response to threshold concentrations of the selective mGluR1/5 agonist 3,5-DHPG. Our findings identify a novel molecular link between Htt and InsP3R1-mediated neuronal Ca2+ signaling and provide an explanation for the derangement of cytosolic Ca2+ signaling in HD patients and mouse models.

Original languageEnglish (US)
Pages (from-to)227-239
Number of pages13
JournalNeuron
Volume39
Issue number2
DOIs
StatePublished - Jul 17 2003

ASJC Scopus subject areas

  • Neuroscience(all)

Fingerprint Dive into the research topics of 'Huntingtin and huntingtin-associated protein 1 influence neuronal calcium signaling mediated by inositol-(1,4,5) triphosphate receptor type 1'. Together they form a unique fingerprint.

  • Cite this