Alzheimer's disease-associated ubiquilin-1 regulates presenilin-1 accumulation and aggresome formation.
Alzheimer's disease-associated ubiquilin-1 regulates presenilin-1 accumulation and aggresome formation.
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DOI:
10.1111/j.1600-0854.2010.01149.x
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发表时间:
2011-03
期刊:
影响因子:
--
通讯作者:
Hiltunen M
中科院分区:
文献类型:
--
作者:
Viswanathan J;Haapasalo A;Böttcher C;Miettinen R;Kurkinen KM;Lu A;Thomas A;Maynard CJ;Romano D;Hyman BT;Berezovska O;Bertram L;Soininen H;Dantuma NP;Tanzi RE;Hiltunen M
The Alzheimer's disease (AD)-associated ubiquilin-1 regulates proteasomal degradation of proteins, including presenilin (PS). PS-dependent γ-secretase generates β-amyloid (Aβ) peptides, which excessively accumulate in AD brain. Here we have characterized the effects of naturally occurring ubiquilin-1 transcript variants (TV) on the levels and subcellular localization of PS1 and other γ-secretase complex components and subsequent γ-secretase function in human embryonic kidney 293, human neuroblastoma SH-SY5Y, and mouse primary cortical cells. Full-length ubiquilin-1 TV1 and TV3 that lacks the proteasome-interaction domain, increased full-length PS1 levels as well as induced accumulation of high-molecular-weight PS1 and aggresome formation. Accumulated PS1 co-localized with TV1 or TV3 in the aggresomes. Electron microscopy indicated that aggresomes containing TV1 or TV3 were targeted to autophagosomes. TV1- and TV3-expressing cells did not accumulate other unrelated proteasome substrates, suggesting that the increase in PS1 levels was not due to a general impairment of the ubiquitin-proteasome system. Furthermore, PS1 accumulation and aggresome formation coincided with alterations in Aβ levels particularly in cells over-expressing TV3. These effects were not related to altered γ-secretase activity or PS1 binding to TV3. Collectively, our results indicate that specific ubiquilin-1 TVs can cause PS1 accumulation and aggresome formation, which may impact AD pathogenesis or susceptibility.
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DOI:
10.1083/jcb.143.7.1883
发表时间:
1998-12-28
期刊:
The Journal of cell biology
影响因子:
--
作者:
Johnston JA;Ward CL;Kopito RR
通讯作者:
Kopito RR
影响因子:
7.8
作者:
Mah, A L;Perry, G;Smith, M A;Monteiro, M J
通讯作者:
Monteiro, M J
影响因子:
3.5
作者:
Doi, H;Mitsui, K;Nukina, N
通讯作者:
Nukina, N
影响因子:
16
作者:
Kleijnen, MF;Shih, AH;Howley, PM
通讯作者:
Howley, PM
影响因子:
5.4
作者:
Gao, L;Tu, H;Lai, MMC
通讯作者:
Lai, MMC