Inhibition of autophagy with 3-methyladenine results in impaired turnover of lysosomes and accumulation of lipofuscin-like material

被引:81
作者
Stroikin, Y [1 ]
Dalen, H [1 ]
Lööf, S [1 ]
Terman, A [1 ]
机构
[1] Linkoping Univ, Div Pathol 2, Dept Neurosci & Locomot, Fac Hlth Sci, S-58185 Linkoping, Sweden
基金
瑞典研究理事会;
关键词
ageing; autophagocytosis; fibroblasts; lysosomes; 3-methyladenine;
D O I
10.1078/0171-9335-00433
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Autophagy (which includes macro-, micro-, and chaperone-mediated autophagy) is an important biological mechanism for degradation of damaged/obsolete macromolecules and organelles. Ageing non-dividing cells, however, progressively accumulate oxidised proteins, defective organelles and intrallysosomal lipofuscin inclusions, suggesting inherent insufficiency of autophagy. To learn more about the role of macroautophagy in the turnover of organelles and lipofuscin formation, we inhibited autophagic sequestration with 3-methyladenine (3 MA) in growth-arrested human fibroblasts, a classical model of cellular ageing. Such treatment resulted in a dramatic accumulation of altered lysosomes, displaying lipofuscin-like autofluorescence, as well as in a moderate increase of mitochondria with lowered membrane potential. The size of the late endosomal compartment appeared not to be significantly altered following 3 MA exposure. The accumulation of lipofuscin-like material was enhanced when 3 MA administration was combined with hyperoxia. The findings suggest that macroautophagy is essential for normal turnover of lysosomes. This notion is supported by reports in the literature of lysosomal membrane proteins inside lysosomes and/or late endosomes, as well as lysosomes with active hydrolases within autophagosomes following vinblastine-induced block of fusion between lysosomes and autophagosomes. The data also suggest that specific components of lysosomes, such as membranes and proteins, may be direct sources of lipofuscin.
引用
收藏
页码:583 / 590
页数:8
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