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Hsu CC, Li Y, Hsu CT, Cheng JT, Lin MH, Cheng KC, Chen SW. Etanercept Ameliorates Cardiac Fibrosis in Rats with Diet-Induced Obesity. Pharmaceuticals (Basel) 2021; 14:ph14040320. [PMID: 33916242 PMCID: PMC8067047 DOI: 10.3390/ph14040320] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/24/2021] [Accepted: 03/29/2021] [Indexed: 12/12/2022] Open
Abstract
Diet-induced obesity (DIO) is considered the main risk factor for cardiovascular diseases. Increases in the plasma levels of tumor necrosis factor alpha (TNF-α) is associated with DIO. Etanercept, a TNF-α inhibitor, has been shown to alleviate cardiac hypertrophy. To investigate the effect of etanercept on cardiac fibrosis in DIO model, rats on high fat diet (HFD) were subdivided into two groups: the etanercept group and vehicle group. Cardiac injury was identified by classic methods, while fibrosis was characterized by histological analysis of the hearts. Etanercept treatment at 0.8 mg/kg/week twice weekly by subcutaneous injection effectively alleviates the cardiac fibrosis in HFD-fed rats. STAT3 activation seems to be induced in parallel with fibrosis-related gene expression in the hearts of HFD-fed rats. Decreased STAT3 activation plays a role in the etanercept-treated animals. Moreover, fibrosis-related genes are activated by palmitate in parallel with STAT3 activation in H9c2 cells. Etanercept may inhibit the effects of palmitate, but it is less effective than a direct inhibitor of STAT3. Direct inhibition of STAT3 activation by etanercept seems unlikely. Etanercept has the ability to ameliorate cardiac fibrosis through reduction of STAT3 activation after the inhibition of TNF-α and/or its receptor.
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Affiliation(s)
- Chia-Chen Hsu
- Department of Exercise and Health Sciences, University of Taipei, Taipei City 110, Taiwan;
- Department of Otorhinolaryngology, Taipei City Hospital, Taipei City 110, Taiwan
- Graduate Institute of Gerontology and Health Care Management, Chang Gung University of Science and Technology, Guishan, Taoyuan City 613, Taiwan;
| | - Yingxiao Li
- Department of Nursing, Tzu Chi University of Science and Technology, Hualien City 970, Taiwan;
| | - Chao-Tien Hsu
- Department of Pathology, I-Shou University Medical Center, Yanchao District, Kaohsiung City 824, Taiwan;
| | - Juei-Tang Cheng
- Department of Medical Research, Chi-Mei Medical Center, Tainan City 710, Taiwan;
| | - Mang-Hung Lin
- Graduate Institute of Gerontology and Health Care Management, Chang Gung University of Science and Technology, Guishan, Taoyuan City 613, Taiwan;
| | - Kai-Chun Cheng
- Department of Pharmacy, College of Pharmacy, Tajen University, Pingtung 907, Taiwan
- Correspondence: (K.-C.C.); (S.-W.C.); Tel.: +886-8-762-4002 (K.-C.C.); +886-6-6336999 (S.-W.C.)
| | - Shang-Wen Chen
- Division of Cardiology, Chi-Mei Medical Center Liouying, Tainan City 736, Taiwan
- Correspondence: (K.-C.C.); (S.-W.C.); Tel.: +886-8-762-4002 (K.-C.C.); +886-6-6336999 (S.-W.C.)
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Sato K, Hikita H, Myojin Y, Fukumoto K, Murai K, Sakane S, Tamura T, Yamai T, Nozaki Y, Yoshioka T, Kodama T, Shigekawa M, Sakamori R, Tatsumi T, Takehara T. Hyperglycemia enhances pancreatic cancer progression accompanied by elevations in phosphorylated STAT3 and MYC levels. PLoS One 2020; 15:e0235573. [PMID: 32609742 PMCID: PMC7329089 DOI: 10.1371/journal.pone.0235573] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 06/18/2020] [Indexed: 01/20/2023] Open
Abstract
Diabetes mellitus is a well-known risk factor for pancreatic cancer. We focused on hyperglycemia, a main feature of diabetes mellitus, and uncovered its effect on precancerous pancreatic intraepithelial neoplasia (PanIN) progression. In vivo induction of hyperglycemia with 100 mg/kg streptozotocin in KrasLSL G12DPdx1Cre (KP) mice promoted the PanIN formation and progression. Preconditioning with a high- or low-glucose medium for 28 days showed that a high-glucose environment increased cell viability and sphere formation in PANC-1, a Kras-mutant human pancreatic ductal adenocarcinoma cell line, and mPKC1, a Kras-mutant murine pancreatic cancer cell line. In contrast, no changes were observed in BxPC3, a Kras-wild-type human pancreatic cancer cell line. Orthotopic injection of mPKC1 into the pancreatic tails of BL6/J mice showed that cells maintained in high-glucose medium grew into larger tumors than did those maintained in low-glucose medium. Hyperglycemia strengthened the STAT3 phosphorylation, which was accompanied by elevated MYC expression in Kras-mutant cells. Immunohistochemistry showed stronger phosphorylated STAT3 (pSTAT3) and MYC staining in PanINs from diabetic KP mice than in those from euglycemic counterparts. STAT3 inhibition with 1 μM STAT3 inhibitor STATTIC in Kras-mutant pancreatic cell lines blocked the cell viability- and sphere formation-enhancing effects of the hyperglycemic environment and reversed the elevated pSTAT3 and MYC expression. MYC knockdown did not affect cell viability but did reduce sphere formation. No decrease in pSTAT3 expression was observed upon siMYC treatment. In conclusion, hyperglycemia, on a Kras-mutant background, aggravates the PanIN progression, which is accompanied by elevated pSTAT3 and MYC expression.
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Affiliation(s)
- Katsuhiko Sato
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hayato Hikita
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yuta Myojin
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Kenji Fukumoto
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Kazuhiro Murai
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Sadatsugu Sakane
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Takeshi Tamura
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Takuo Yamai
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yasutoshi Nozaki
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Teppei Yoshioka
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Takahiro Kodama
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Minoru Shigekawa
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Ryotaro Sakamori
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tomohide Tatsumi
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tetsuo Takehara
- Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, Osaka, Japan
- * E-mail:
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Kuo FY, Cheng KC, Li Y, Cheng JT, Tsai CC. Promotion of Adropin Expression by Hyperglycemia Is Associated with STAT3 Activation in Diabetic Rats. Diabetes Metab Syndr Obes 2020; 13:2269-2277. [PMID: 32636661 PMCID: PMC7334037 DOI: 10.2147/dmso.s243755] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 06/09/2020] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Adropin is a secreted polypeptide that has been demonstrated to play an important role in energy homeostasis and lipid metabolism. Signal transducer and activator of transcription 3 (STAT3) may promote the transcription of target genes including adropin. In the current study, we investigated the effect of adropin on glucose metabolism in diabetic rats and the mechanism that governs this effect was subsequently assessed. MATERIALS AND METHODS Rats received a single injection of streptozotocin to induce type 1 diabetes. The diabetic rats were treated with insulin or phloridzin, another antidiabetic agent through inhibition of glucose reabsorption, for 7 days. Plasma glucose levels and adropin levels were measured. The interaction between STAT3 and adropin was evaluated using the human hepatoma HepG2 cell line. HepG2 cells were pretreated with the specific antagonist Stattic or with STAT3-specific siRNAs to knockout STAT3. Changes in energy homeostasis-associated gene expression were measured using real-time PCR. The protein expression levels of pSTAT3 and STAT3 were measured using Western blotting. RESULTS In diabetic rats, the serum concentrations of adropin were increased in the vehicle-treated group and decreased in the insulin- or phloridzin-treated group. In liver tissues, the Enho expression level and the activity of STAT3 also showed similar tendencies. After HepG2 cells were treated with medium containing high glucose, the ratio of p-STAT3 to STAT3, Enho mRNA levels and reactive oxygen species expression levels in HepG2 cells were significantly increased in conjunction with increased glucose levels. The effect was inhibited after pretreatment with Stattic or knockdown with STAT3-specific siRNAs. CONCLUSION STAT3 is involved in the genetic regulation of adropin, increasing the levels of circulating adropin and promoting Enho expression in the livers of diabetic rats.
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Affiliation(s)
- Feng Yu Kuo
- Cardiovascular Centre, Kaohsiung Veterans General Hospital, Kaohsiung Citty, Taiwan
- Department of Pharmacy, College of Pharmacy and Health Care, Tajen University, Pingtung County, Taiwan
| | - Kai-Chun Cheng
- Pharmacological Department of Herbal Medicine and Department of Psychosomatic Internal Medicine, Graduate School of Medical and Dental Sciences, Kagoshima Unuversity, Kagoshima, Japan
| | - Yingxiao Li
- Department of Nursing, Tzu Chi University of Science and Technology, Hualien97005, Taiwan
| | - Juei-Tang Cheng
- Department of Medical Research, Chi-Mei Medical Center, Tainan, Taiwan
- Correspondence: Juei-Tang Cheng Department of Medical Research,Chi-Mei Medical Center, No. 901, Zhonghua Road Yongkang District, Tainan71004, TaiwanTel +886-6-2517864 Email
| | - Cheng-Chia Tsai
- Department of Surgery, Mackay Memorial Hospital, Taipei City, Taiwan
- Department of Medicine, Mackay Medical College, New Taipei, Taiwan
- Cheng-Chia Tsai Department of Surgery,Mackay Memorial Hospital, No. 92, Sec.2, Chung-Shan North Road, Taipei City10449, TaiwanTel +886-2-25433535 Email
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Dela Justina V, San Martin S, López-Espíndola D, Bressan AFM, Alves de Freitas R, Lopes de Passos AM, Varas J, Lima VV, Giachini FR. Increased expression of STAT3 and SOCS3 in placenta from hyperglycemic rats. Eur J Histochem 2019; 63. [PMID: 31833328 PMCID: PMC6829518 DOI: 10.4081/ejh.2019.3054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 09/07/2019] [Indexed: 12/18/2022] Open
Abstract
Signal transducer and activator of transcription 3 (STAT3) is a transcription factor that is activated by interleukin (IL)-6 and IL-10 that generate nearly opposing responses. The suppressor of cytokine signaling 3 (SOCS3) is the negative regulator of STAT3 and plays an important role in the negative regulation of the inflammatory process. Evidence has shown the importance of STAT3 and SOCS3 during implantation and normal pregnancy. However, little is known about the relationship of both factors under hyperglycemic condition. The aim of this study was to evaluate the placenta regions exhibiting immunopositivity for STAT3 and SOCS3 in hyperglycemic rats, as well as correlate these proteins with IL-10 and IL-6 levels. It was observed increased expression of STAT3 at the labyrinth (approximately 47% of increase compared to control) and junctional zone (approximately 32% of increase compared to control) from hyperglycemic placentas. Similar results were observed to SOCS3 (approximately 71% -labyrinth- and 53% -junctional zone- of increase compared to control). The levels of IL-10 were augmented at hyperglycemic placentas (approximately 1.5 fold of increase) and they were positively correlated with the increase of STAT3 at the labyrinth and SOCS at junctional zone. Therefore, under hyperglycemic conditions, the relation between STAT3 and SOCS3 was changed, leading to unbalance of the cytokine profile.
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