Caveolin-1 deficiency induces premature senescence with mitochondrial dysfunction
Dong-Min Yu1,2, Seung Hee Jung3,4, Hyoung-Tae An1,2
1Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.
Aging Cell
|May 18, 2017
Summary
Caveolin-1 (Cav-1) deficiency triggers cellular senescence by impairing mitochondrial function and inactivating SIRT1, a key regulator. This study clarifies Cav-1
Area of Science:
- Cell Biology
- Mitochondrial Biology
- Aging Research
Background:
- Caveolin-1 (Cav-1) has paradoxical roles in cellular senescence.
- Cav-1 deficiency can prevent senescence despite mitochondrial dysfunction.
Purpose of the Study:
- To resolve the paradox of Cav-1's role in cellular senescence.
- To investigate the mechanisms linking Cav-1 deficiency to senescence.
Main Methods:
- Utilized human diploid fibroblasts, A549, HCT116, and Cav-1 knockout mouse embryonic fibroblasts.
- Assessed cellular senescence, p53-p21 pathway, cardiolipin levels, and mitochondrial function.
- Measured mitochondrial respiration, oxidative phosphorylation complex I activity, SIRT1 activity, and NAD+/NADH ratio.
Main Results:
- Cav-1 deficiency induced senescence via a p53-p21-dependent pathway.
- Cav-1 deficiency downregulated cardiolipin biosynthesis, reducing cardiolipin content and impairing mitochondrial respiration.
- Cav-1 deficiency decreased oxidative phosphorylation complex I activity, inactivated SIRT1, and lowered the NAD+/NADH ratio.
Conclusions:
- Cav-1 deficiency induces premature cellular senescence.
- Mitochondrial dysfunction and SIRT1 inactivation are key mechanisms in Cav-1 deficiency-induced senescence.
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