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Yang G, Hong E, Oh S, Kim E. Lactobacillus amylovorus KU4 induces adipose browning in obese mice by regulating PP4C. J Endocrinol 2024; 260:e230185. [PMID: 38109258 DOI: 10.1530/joe-23-0185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Accepted: 12/18/2023] [Indexed: 12/20/2023]
Abstract
We previously reported that Lactobacillus amylovorus KU4 (LKU4) promotes adipocyte browning in mice fed a high-fat diet (HFD mice) in part by remodeling the PPARγ transcription complex. However, the mechanism through which LKU4 enables PPARγ to drive adipocyte browning remains elusive. Here, we report that LKU4 inhibits the expression of PP4C in inguinal white adipose tissue of HFD mice and in insulin-resistant 3T3-L1 adipocytes, which promotes SIRT1-dependent PPARγ deacetylation by activating AMPK, leading to the browning of adipocytes. Consistently, the silencing of PP4C further enhances this pathway. Furthermore, we observed that lactate, a key LKU4 metabolite, reduces insulin-induced PP4C expression and suppresses PP4C inhibition of PPARγ deacetylation and transcriptional activity via AMPK-SIRT1, thereby facilitating the browning of adipocytes. Together, these data demonstrate that LKU4 promotes the AMPK-SIRT1-PPARγ pathway by inhibiting PP4C, thereby facilitating adipocyte browning in HFD mice.
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Affiliation(s)
- Garam Yang
- Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Buk-Gu, Gwangju, Republic of Korea
| | - Eunjeong Hong
- Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Buk-Gu, Gwangju, Republic of Korea
| | - Sejong Oh
- Division of Animal Science, College of Agriculture & Life Sciences, Chonnam National University, Buk-Gu, Gwangju, Republic of Korea
| | - Eungseok Kim
- Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Buk-Gu, Gwangju, Republic of Korea
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Wang B, Zhu XX, Pan LY, Chen HF, Shen XY. PP4C facilitates lung cancer proliferation and inhibits apoptosis via activating MAPK/ERK pathway. Pathol Res Pract 2020; 216:152910. [PMID: 32139257 DOI: 10.1016/j.prp.2020.152910] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 02/09/2020] [Accepted: 02/28/2020] [Indexed: 12/26/2022]
Abstract
PURPOSE Protein phosphatase 4 catalytic subunit (PP4C) has been shown to play crucial regulatory roles in biological process and is frequently upregulated in cancer such as breast and colorectal carcinoma. However, the function and potential molecular mechanism of PP4C in lung cancer remains unclear. METHODS Bioinformatic analysis was used to detect the expression level and prognosis of patients. Western blot, quantitative real-time PCR (qRT-PCR), CCK8, 5-Ethynyl-2'-deoxyuridine (Edu) proliferation assay and flow cytometric were used to explore the function in lung cancer cells. RESULTS In this study, we found that PP4C was upregulated in lung cancer tissues as compared with that in normal lung tissues. Furthermore, patients with high expression level of PP4C were correlated with a poor prognosis in lung cancer patients. In vitro, CCK8, Edu proliferation assays and flow cytometry analysis showed that PP4C could promote lung cancer cell growth and inhibit apoptosis. Mechanistic investigations revealed that PP4C may interact with PP4R1 and promote ERK activation. Additionally, PP4C depletion resulted in lower tumor growth in vivo. CONCLUSIONS Taken together, these data showed the oncogenic of PP4C in NSCLC tumorigenesis and provide a new insight of PP4C in the progression of NSCLC.
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Affiliation(s)
- Bin Wang
- Department of Thoracic Surgery, The Affiliated Huadong Hospital of Fudan University, No. 221 West Yan-an Road, Shanghai 200040, China
| | - Xun-Xia Zhu
- Department of Thoracic Surgery, The Affiliated Huadong Hospital of Fudan University, No. 221 West Yan-an Road, Shanghai 200040, China
| | - Lin-Yue Pan
- Department of Respiration, The Affiliated Huadong Hospital of Fudan University, No. 221 West Yan-an Road, Shanghai 200040, China
| | - He-Feng Chen
- Department of Respiration, The Affiliated Huadong Hospital of Fudan University, No. 221 West Yan-an Road, Shanghai 200040, China.
| | - Xiao-Yong Shen
- Department of Thoracic Surgery, The Affiliated Huadong Hospital of Fudan University, No. 221 West Yan-an Road, Shanghai 200040, China.
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Isono M, Niimi A, Oike T, Hagiwara Y, Sato H, Sekine R, Yoshida Y, Isobe SY, Obuse C, Nishi R, Petricci E, Nakada S, Nakano T, Shibata A. BRCA1 Directs the Repair Pathway to Homologous Recombination by Promoting 53BP1 Dephosphorylation. Cell Rep 2017; 18:520-532. [PMID: 28076794 DOI: 10.1016/j.celrep.2016.12.042] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 10/03/2016] [Accepted: 12/13/2016] [Indexed: 11/16/2022] Open
Abstract
BRCA1 promotes homologous recombination (HR) by activating DNA-end resection. By contrast, 53BP1 forms a barrier that inhibits DNA-end resection. Here, we show that BRCA1 promotes DNA-end resection by relieving the 53BP1-dependent barrier. We show that 53BP1 is phosphorylated by ATM in S/G2 phase, promoting RIF1 recruitment, which inhibits resection. 53BP1 is promptly dephosphorylated and RIF1 released, despite remaining unrepaired DNA double-strand breaks (DSBs). When resection is impaired by CtIP/MRE11 endonuclease inhibition, 53BP1 phosphorylation and RIF1 are sustained due to ongoing ATM signaling. BRCA1 depletion also sustains 53BP1 phosphorylation and RIF1 recruitment. We identify the phosphatase PP4C as having a major role in 53BP1 dephosphorylation and RIF1 release. BRCA1 or PP4C depletion impairs 53BP1 repositioning, EXO1 recruitment, and HR progression. 53BP1 or RIF1 depletion restores resection, RAD51 loading, and HR in PP4C-depleted cells. Our findings suggest that BRCA1 promotes PP4C-dependent 53BP1 dephosphorylation and RIF1 release, directing repair toward HR.
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Affiliation(s)
- Mayu Isono
- Advanced Scientific Research Leaders Development Unit, Gunma University, Maebashi, Gunma 371-8511, Japan; Gunma University Heavy Ion Medical Center, Gunma University, Maebashi, Gunma 371-8511, Japan
| | - Atsuko Niimi
- Gunma University Initiative for Advanced Research, Gunma University, Maebashi, Gunma 371-8511, Japan
| | - Takahiro Oike
- Department of Radiation Oncology, Gunma University, Maebashi, Gunma 371-8511, Japan
| | - Yoshihiko Hagiwara
- Advanced Scientific Research Leaders Development Unit, Gunma University, Maebashi, Gunma 371-8511, Japan; Department of Radiation Oncology, Gunma University, Maebashi, Gunma 371-8511, Japan
| | - Hiro Sato
- Department of Radiation Oncology, Gunma University, Maebashi, Gunma 371-8511, Japan
| | - Ryota Sekine
- Advanced Scientific Research Leaders Development Unit, Gunma University, Maebashi, Gunma 371-8511, Japan
| | - Yukari Yoshida
- Gunma University Heavy Ion Medical Center, Gunma University, Maebashi, Gunma 371-8511, Japan
| | - Shin-Ya Isobe
- Graduate School of Life Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
| | - Chikashi Obuse
- Graduate School of Life Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan
| | - Ryotaro Nishi
- Department of Biomedical Sciences, College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Elena Petricci
- Department of Biotechnology, Chemistry, and Pharmacy, Università degli Studi di Siena, 53100 Siena, Italy
| | - Shinichiro Nakada
- Department of Bioregulation and Cellular Response, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Takashi Nakano
- Gunma University Heavy Ion Medical Center, Gunma University, Maebashi, Gunma 371-8511, Japan; Gunma University Initiative for Advanced Research, Gunma University, Maebashi, Gunma 371-8511, Japan; Department of Radiation Oncology, Gunma University, Maebashi, Gunma 371-8511, Japan
| | - Atsushi Shibata
- Advanced Scientific Research Leaders Development Unit, Gunma University, Maebashi, Gunma 371-8511, Japan.
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