Nuclear-localized SIRT1 inhibits apoptosis via deacetylating p53
The function of silencing information regulator 1 (SIRT1) in promoting or inhibiting apoptosis remains a subject of debate. Here, we aim to evaluate the roles of nuclear-localized SIRT1 in STS/DOX-induced apoptosis. Silencing nuclear-localized SIRT1 significantly enhanced STS/DOX-induced apoptosis,...
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| Published in | The international journal of biochemistry & cell biology Vol. 187; p. 106841 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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01.10.2025
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| Abstract | The function of silencing information regulator 1 (SIRT1) in promoting or inhibiting apoptosis remains a subject of debate. Here, we aim to evaluate the roles of nuclear-localized SIRT1 in STS/DOX-induced apoptosis. Silencing nuclear-localized SIRT1 significantly enhanced STS/DOX-induced apoptosis, while overexpression of nuclear-localized SIRT1 markedly inhibited STS/DOX-induced process, demonstrating the anti-apoptotic ability of the nuclear-localized SIRT1. Critically, silencing p53 compromised the anti-apoptotic function of nuclear-localized SIRT1, thereby underscoring the essential role of p53 in mediating SIRT1's anti-apoptotic capability. Western blot analysis further revealed that wild-type SIRT1 robustly downregulated Ac-p53 expression to inhibit apoptosis, whereas a deacetylase-defective mutant of SIRT1 (SIRT1H363Y) markedly upregulated Ac-p53 to promote apoptosis. Fluorescence resonance energy transfer (FRET) analyses for the cells co-expressing nuclear-localized SIRT1-CFP and p53-YFP showed that STS enhanced the direct interaction between SIRT1 and p53 in nucleus, suggesting that the nuclear-localized SIRT1 directly interacts with p53 to deacetylate p53, thus inhibiting apoptosis. On the contrary，overexpression of cytoplasm-localized SIRT1 markedly promoted STS/DOX-induced apoptosis, firmly demonstrating the pro-apoptotic ability of the cytoplasm-localized SIRT1. These results firmly demonstrate a notion that nuclear-localized SIRT1 inhibits apoptosis via deacetylating p53. |
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| AbstractList | The function of silencing information regulator 1 (SIRT1) in promoting or inhibiting apoptosis remains a subject of debate. Here, we aim to evaluate the roles of nuclear-localized SIRT1 in STS/DOX-induced apoptosis. Silencing nuclear-localized SIRT1 significantly enhanced STS/DOX-induced apoptosis, while overexpression of nuclear-localized SIRT1 markedly inhibited STS/DOX-induced process, demonstrating the anti-apoptotic ability of the nuclear-localized SIRT1. Critically, silencing p53 compromised the anti-apoptotic function of nuclear-localized SIRT1, thereby underscoring the essential role of p53 in mediating SIRT1's anti-apoptotic capability. Western blot analysis further revealed that wild-type SIRT1 robustly downregulated Ac-p53 expression to inhibit apoptosis, whereas a deacetylase-defective mutant of SIRT1 (SIRT1
) markedly upregulated Ac-p53 to promote apoptosis. Fluorescence resonance energy transfer (FRET) analyses for the cells co-expressing nuclear-localized SIRT1-CFP and p53-YFP showed that STS enhanced the direct interaction between SIRT1 and p53 in nucleus, suggesting that the nuclear-localized SIRT1 directly interacts with p53 to deacetylate p53, thus inhibiting apoptosis. On the contrary，overexpression of cytoplasm-localized SIRT1 markedly promoted STS/DOX-induced apoptosis, firmly demonstrating the pro-apoptotic ability of the cytoplasm-localized SIRT1. These results firmly demonstrate a notion that nuclear-localized SIRT1 inhibits apoptosis via deacetylating p53. The function of silencing information regulator 1 (SIRT1) in promoting or inhibiting apoptosis remains a subject of debate. Here, we aim to evaluate the roles of nuclear-localized SIRT1 in STS/DOX-induced apoptosis. Silencing nuclear-localized SIRT1 significantly enhanced STS/DOX-induced apoptosis, while overexpression of nuclear-localized SIRT1 markedly inhibited STS/DOX-induced process, demonstrating the anti-apoptotic ability of the nuclear-localized SIRT1. Critically, silencing p53 compromised the anti-apoptotic function of nuclear-localized SIRT1, thereby underscoring the essential role of p53 in mediating SIRT1's anti-apoptotic capability. Western blot analysis further revealed that wild-type SIRT1 robustly downregulated Ac-p53 expression to inhibit apoptosis, whereas a deacetylase-defective mutant of SIRT1 (SIRT1H363Y) markedly upregulated Ac-p53 to promote apoptosis. Fluorescence resonance energy transfer (FRET) analyses for the cells co-expressing nuclear-localized SIRT1-CFP and p53-YFP showed that STS enhanced the direct interaction between SIRT1 and p53 in nucleus, suggesting that the nuclear-localized SIRT1 directly interacts with p53 to deacetylate p53, thus inhibiting apoptosis. On the contrary，overexpression of cytoplasm-localized SIRT1 markedly promoted STS/DOX-induced apoptosis, firmly demonstrating the pro-apoptotic ability of the cytoplasm-localized SIRT1. These results firmly demonstrate a notion that nuclear-localized SIRT1 inhibits apoptosis via deacetylating p53. The function of silencing information regulator 1 (SIRT1) in promoting or inhibiting apoptosis remains a subject of debate. Here, we aim to evaluate the roles of nuclear-localized SIRT1 in STS/DOX-induced apoptosis. Silencing nuclear-localized SIRT1 significantly enhanced STS/DOX-induced apoptosis, while overexpression of nuclear-localized SIRT1 markedly inhibited STS/DOX-induced process, demonstrating the anti-apoptotic ability of the nuclear-localized SIRT1. Critically, silencing p53 compromised the anti-apoptotic function of nuclear-localized SIRT1, thereby underscoring the essential role of p53 in mediating SIRT1's anti-apoptotic capability. Western blot analysis further revealed that wild-type SIRT1 robustly downregulated Ac-p53 expression to inhibit apoptosis, whereas a deacetylase-defective mutant of SIRT1 (SIRT1H363Y) markedly upregulated Ac-p53 to promote apoptosis. Fluorescence resonance energy transfer (FRET) analyses for the cells co-expressing nuclear-localized SIRT1-CFP and p53-YFP showed that STS enhanced the direct interaction between SIRT1 and p53 in nucleus, suggesting that the nuclear-localized SIRT1 directly interacts with p53 to deacetylate p53, thus inhibiting apoptosis. On the contrary，overexpression of cytoplasm-localized SIRT1 markedly promoted STS/DOX-induced apoptosis, firmly demonstrating the pro-apoptotic ability of the cytoplasm-localized SIRT1. These results firmly demonstrate a notion that nuclear-localized SIRT1 inhibits apoptosis via deacetylating p53.The function of silencing information regulator 1 (SIRT1) in promoting or inhibiting apoptosis remains a subject of debate. Here, we aim to evaluate the roles of nuclear-localized SIRT1 in STS/DOX-induced apoptosis. Silencing nuclear-localized SIRT1 significantly enhanced STS/DOX-induced apoptosis, while overexpression of nuclear-localized SIRT1 markedly inhibited STS/DOX-induced process, demonstrating the anti-apoptotic ability of the nuclear-localized SIRT1. Critically, silencing p53 compromised the anti-apoptotic function of nuclear-localized SIRT1, thereby underscoring the essential role of p53 in mediating SIRT1's anti-apoptotic capability. Western blot analysis further revealed that wild-type SIRT1 robustly downregulated Ac-p53 expression to inhibit apoptosis, whereas a deacetylase-defective mutant of SIRT1 (SIRT1H363Y) markedly upregulated Ac-p53 to promote apoptosis. Fluorescence resonance energy transfer (FRET) analyses for the cells co-expressing nuclear-localized SIRT1-CFP and p53-YFP showed that STS enhanced the direct interaction between SIRT1 and p53 in nucleus, suggesting that the nuclear-localized SIRT1 directly interacts with p53 to deacetylate p53, thus inhibiting apoptosis. On the contrary，overexpression of cytoplasm-localized SIRT1 markedly promoted STS/DOX-induced apoptosis, firmly demonstrating the pro-apoptotic ability of the cytoplasm-localized SIRT1. These results firmly demonstrate a notion that nuclear-localized SIRT1 inhibits apoptosis via deacetylating p53. |
| ArticleNumber | 106841 |
| Author | Wu, Ge Yao, Wei Chen, Tongsheng Cheng, Lin Zhang, Chunsun Deng, Kangrong |
| Author_xml | – sequence: 1 givenname: Lin surname: Cheng fullname: Cheng, Lin organization: MOE Key Laboratory of Laser Life Science, College of Biophotonics, School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou, Guangdong 510631, China – sequence: 2 givenname: Ge surname: Wu fullname: Wu, Ge email: gewu1215@163.com organization: MOE Key Laboratory of Laser Life Science, College of Biophotonics, School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou, Guangdong 510631, China – sequence: 3 givenname: Wei surname: Yao fullname: Yao, Wei organization: MOE Key Laboratory of Laser Life Science, College of Biophotonics, School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou, Guangdong 510631, China – sequence: 4 givenname: Kangrong surname: Deng fullname: Deng, Kangrong organization: MOE Key Laboratory of Laser Life Science, College of Biophotonics, School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou, Guangdong 510631, China – sequence: 5 givenname: Chunsun surname: Zhang fullname: Zhang, Chunsun organization: MOE Key Laboratory of Laser Life Science, College of Biophotonics, School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou, Guangdong 510631, China – sequence: 6 givenname: Tongsheng surname: Chen fullname: Chen, Tongsheng email: chentsh@scnu.edu.cn organization: MOE Key Laboratory of Laser Life Science, College of Biophotonics, School of Optoelectronic Science and Engineering, South China Normal University, Guangzhou, Guangdong 510631, China |
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| Keywords | Rr ShRNAs Eto TSA NSCLC IP apoptosis PARP nuclear-localized SIRT1 DOX SIRT1 p53 NAD RC STS NLS cytoplasm-localized SIRT1 FRET WT ED |
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| Snippet | The function of silencing information regulator 1 (SIRT1) in promoting or inhibiting apoptosis remains a subject of debate. Here, we aim to evaluate the roles... |
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| SubjectTerms | Acetylation - drug effects apoptosis Apoptosis - drug effects Cell Line, Tumor Cell Nucleus - metabolism cytoplasm-localized SIRT1 Humans nuclear-localized SIRT1 p53 Sirtuin 1 - genetics Sirtuin 1 - metabolism Tumor Suppressor Protein p53 - genetics Tumor Suppressor Protein p53 - metabolism |
| Title | Nuclear-localized SIRT1 inhibits apoptosis via deacetylating p53 |
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