TY - JOUR
T1 - Huntingtin and huntingtin-associated protein 1 influence neuronal calcium signaling mediated by inositol-(1,4,5) triphosphate receptor type 1
AU - Tang, Tie Shan
AU - Tu, Huiping
AU - Chan, Edmond Y W
AU - Maximov, Anton
AU - Wang, Zhengnan
AU - Wellington, Cheryl L.
AU - Hayden, Michael R.
AU - Bezprozvanny, Ilya
N1 - Funding Information:
We thank Thomas C. Südhof for advice with yeast two-hybrid screen and the gift of a rat brain cDNA library and Phyllis Foley for administrative assistance. We thank Thomas C. Südhof for rat InsP 3 R1 cDNA, Claire-Anne Gutekunst for HAP1 monoclonal antibodies, and Christopher A Ross for HD-FL-23Q and HD-FL-82Q plasmids. I.B. is supported by the Robert A. Welch Foundation, the Huntington's Disease Society of America, the Hereditary Disease Foundation, and NIH R01 NS38082. M.R.H. is supported by the Canadian Institutes of Health Research, the Hereditary Disease Foundation, and the Huntington's Disease Society of America and holds a Canada Research Chair in Human Genetics.
PY - 2003/7/17
Y1 - 2003/7/17
N2 - 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.
AB - 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.
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U2 - 10.1016/S0896-6273(03)00366-0
DO - 10.1016/S0896-6273(03)00366-0
M3 - Article
C2 - 12873381
AN - SCOPUS:0041963057
SN - 0896-6273
VL - 39
SP - 227
EP - 239
JO - Neuron
JF - Neuron
IS - 2
ER -