Impaired autophagy activity is linked to elevated ER-stress and inflammation in aging adipose tissue.
Impaired autophagy activity is linked to elevated ER-stress and inflammation in aging adipose tissue.
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DOI:
10.18632/aging.101083
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发表时间:
2016-10-24
期刊:
影响因子:
--
通讯作者:
Yung R
中科院分区:
文献类型:
--
作者:
Ghosh AK;Mau T;O'Brien M;Garg S;Yung R
Adipose tissue dysfunction in aging is associated with inflammation, metabolic syndrome and other diseases. We propose that impaired protein homeostasis due to compromised lysosomal degradation (micro-autophagy) might promote aberrant ER stress response and inflammation in aging adipose tissue. Using C57BL/6 mouse model, we demonstrate that adipose tissue-derived stromal vascular fraction (SVF) cells from old (18-20 months) mice have reduced expression of autophagy markers as compared to the younger (4-6 months) cohort. Elevated expressions of ER-stress marker CHOP and autophagy substrate SQSTM1/p62 are observed in old SVFs compared to young, when treated with either vehicle or with thapsigargin (Tg), an ER stress inducer. Treatment with bafilomycin A1 (Baf), a vacuolar-type H (+)-ATPase, or Tg elevated expressions of CHOP, and SQSTM1/p62 and LC-3-II, in 3T3-L1-preadipocytes. We also demonstrate impaired autophagy activity in old SVFs by analyzing increased accumulation of autophagy substrates LC3-II and p62. Compromised autophagy activity in old SVFs is correlated with enhanced release of pro-inflammatory cytokines IL-6 and MCP-1. Finally, SVFs from calorie restricted old mice (CR-O) have shown enhanced autophagy activity compared to ad libitum fed old mice (AL-O). Our results support the notion that diminished autophagy activity with aging contributes to increased adipose tissue ER stress and inflammation.
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影响因子:
11.1
作者:
He C;Klionsky DJ
通讯作者:
Klionsky DJ
DOI:
10.18632/aging.100881
发表时间:
2016-02
期刊:
Aging
影响因子:
--
作者:
Chiao YA;Kolwicz SC;Basisty N;Gagnidze A;Zhang J;Gu H;Djukovic D;Beyer RP;Raftery D;MacCoss M;Tian R;Rabinovitch PS
通讯作者:
Rabinovitch PS
影响因子:
4.3
作者:
Makino, Naoki;Oyama, Jun-ichi;Maeda, Toyoki;Koyanagi, Masamichi;Higuchi, Yoshihiro;Tsuchida, Keiko
通讯作者:
Tsuchida, Keiko
DOI:
10.1152/ajpheart.00307.2014
发表时间:
2014-08-01
影响因子:
4.8
作者:
Csiszar, Anna;Gautam, Tripti;Ungvari, Zoltan
通讯作者:
Ungvari, Zoltan
影响因子:
29
作者:
Bjedov I;Toivonen JM;Kerr F;Slack C;Jacobson J;Foley A;Partridge L
通讯作者:
Partridge L