L-Arginine Ameliorates Defective Autophagy in GM2 Gangliosidoses by mTOR Modulation.
L-Arginine Ameliorates Defective Autophagy in GM2 Gangliosidoses by mTOR Modulation.
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L-精氨酸通过mTOR调节改善GM 2神经节苷脂沉积症中的自噬缺陷。
DOI:
10.3390/cells10113122
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发表时间:
2021-11-11
期刊:
影响因子:
6
通讯作者:
Cordero MD
中科院分区:
文献类型:
--
作者:
Castejón-Vega B;Rubio A;Pérez-Pulido AJ;Quiles JL;Lane JD;Fernández-Domínguez B;Cachón-González MB;Martín-Ruiz C;Sanz A;Cox TM;Alcocer-Gómez E;Cordero MD
Aims: Tay–Sachs and Sandhoff diseases (GM2 gangliosidosis) are autosomal recessive disorders of lysosomal function that cause progressive neurodegeneration in infants and young children. Impaired hydrolysis catalysed by β-hexosaminidase A (HexA) leads to the accumulation of GM2 ganglioside in neuronal lysosomes. Despite the storage phenotype, the role of autophagy and its regulation by mTOR has yet to be explored in the neuropathogenesis. Accordingly, we investigated the effects on autophagy and lysosomal integrity using skin fibroblasts obtained from patients with Tay–Sachs and Sandhoff diseases. Results: Pathological autophagosomes with impaired autophagic flux, an abnormality confirmed by electron microscopy and biochemical studies revealing the accelerated release of mature cathepsins and HexA into the cytosol, indicating increased lysosomal permeability. GM2 fibroblasts showed diminished mTOR signalling with reduced basal mTOR activity. Accordingly, provision of a positive nutrient signal by L-arginine supplementation partially restored mTOR activity and ameliorated the cytopathological abnormalities. Innovation: Our data provide a novel molecular mechanism underlying GM2 gangliosidosis. Impaired autophagy caused by insufficient lysosomal function might represent a new therapeutic target for these diseases. Conclusions: We contend that the expression of autophagy/lysosome/mTOR-associated molecules may prove useful peripheral biomarkers for facile monitoring of treatment of GM2 gangliosidosis and neurodegenerative disorders that affect the lysosomal function and disrupt autophagy.
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影响因子:
11.1
作者:
Lim JA;Li L;Shirihai OS;Trudeau KM;Puertollano R;Raben N
通讯作者:
Raben N
影响因子:
7.8
作者:
Aflaki E;Moaven N;Borger DK;Lopez G;Westbroek W;Chae JJ;Marugan J;Patnaik S;Maniwang E;Gonzalez AN;Sidransky E
通讯作者:
Sidransky E
影响因子:
8.8
作者:
Sarkar S;Carroll B;Buganim Y;Maetzel D;Ng AH;Cassady JP;Cohen MA;Chakraborty S;Wang H;Spooner E;Ploegh H;Gsponer J;Korolchuk VI;Jaenisch R
通讯作者:
Jaenisch R
DOI:
10.1038/nrm3522
发表时间:
2013-03
期刊:
Nature reviews. Molecular cell biology
影响因子:
--
作者:
通讯作者:
--
影响因子:
13.3
作者:
Mizunoe Y;Sudo Y;Okita N;Hiraoka H;Mikami K;Narahara T;Negishi A;Yoshida M;Higashibata R;Watanabe S;Kaneko H;Natori D;Furuichi T;Yasukawa H;Kobayashi M;Higami Y
通讯作者:
Higami Y