dc.contributor.author | Wu, Jun-chao | en_US |
dc.contributor.author | Lin, Fang | en_US |
dc.contributor.author | Qi, Lin | en_US |
dc.contributor.author | Wang, Yan | en_US |
dc.contributor.author | Kegel, Kimberly B | en_US |
dc.contributor.author | Yoder, Jennifer | en_US |
dc.contributor.author | Difiglia, Marian | en_US |
dc.contributor.author | Qin, Zheng-hong | en_US |
dc.date.accessioned | 2014-10-01T14:29:12Z | |
dc.date.issued | 2012 | en_US |
dc.identifier.citation | Wu, Jun-chao, Lin Qi, Yan Wang, Kimberly B Kegel, Jennifer Yoder, Marian Difiglia, Zheng-hong Qin, and Fang Lin. 2012. “The regulation of N-terminal Huntingtin (Htt552) accumulation by Beclin1.” Acta Pharmacologica Sinica 33 (6): 743-751. doi:10.1038/aps.2012.14. http://dx.doi.org/10.1038/aps.2012.14. | en |
dc.identifier.issn | 1671-4083 | en |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:12987364 | |
dc.description.abstract | Aim: Huntingtin protein (Htt) was a neuropathological hallmark in human Huntington's Disease. The study aimed to investigate whether the macroautophagy regulator, Beclin1, was involved in the degradation of Htt. Methods: PC12 cells and primary cultured brain neurons of rats were examined. pDC316 adenovirus shuttle plasmid was used to mediate the expression of wild-type Htt-18Q-552 or mutant Htt-100Q-552 in PC12 cells. The expression of the autophagy-related proteins LC3 II and Beclin1, as well as the lysosome-associated enzymes Cathepsin B and L was evaluated using Western blotting. The locations of Beclin1 and Htt were observed with immunofluorescence and confocal microscope. Results: Htt552 expression increased the expression of LC3 II, Beclin1, cathepsin B and L in autophagy/lysosomal degradation pathway. Treatment with the autophagy inhibitor 3-MA or the proteasome inhibitors lactacystin and MG-132 increased Htt552 levels in PC12 cells infected with Ad-Htt-18Q-552 or Ad-Htt-100Q-552. The proteasome inhibitor caused a higher accumulation of Htt552-18Q than Htt552-100Q, and the autophagy inhibitor resulted in a higher accumulation of Htt552-100Q than Htt552-18Q. Similar results were observed in primary cultured neurons infected with adenovirus. In Htt552-expressing cells, Beclin1 was redistributed from the nucleus to the cytoplasm. Htt siRNA prevented Beclin1 redistribution in starvation conditions. Blockade of Beclin1 nuclear export by leptomycin B or Beclin1 deficiency caused by RNA interference induced the formation of mHtt552 aggregates. Conclusion: Beclin1 regulates the accumulation of Htt via macroautophagy. | en |
dc.language.iso | en_US | en |
dc.publisher | Nature Publishing Group | en |
dc.relation.isversionof | doi:10.1038/aps.2012.14 | en |
dc.relation.hasversion | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4010368/pdf/ | en |
dash.license | LAA | en_US |
dc.subject | Huntingtin (Htt) | en |
dc.subject | Beclin1 | en |
dc.subject | protein degradation | en |
dc.subject | autophagy | en |
dc.subject | RNA interference | en |
dc.subject | ubiquitin-proteasome system | en |
dc.subject | autophagy/lysosome pathway | en |
dc.title | The regulation of N-terminal Huntingtin (Htt552) accumulation by Beclin1 | en |
dc.type | Journal Article | en_US |
dc.description.version | Version of Record | en |
dc.relation.journal | Acta Pharmacologica Sinica | en |
dash.depositing.author | Kegel, Kimberly B | en_US |
dc.date.available | 2014-10-01T14:29:12Z | |
dc.identifier.doi | 10.1038/aps.2012.14 | * |
dash.contributor.affiliated | Kegel, Kimberly | |
dash.contributor.affiliated | DiFiglia, Marian | |