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Wo L, Zhang B, You X, Hu Y, Gu Z, Zhang M, Wang Q, Lv Z, Zhao H. Up-regulation of LncRNA UCA1 by TGF-β promotes doxorubicin resistance in breast cancer cells. Immunopharmacol Immunotoxicol 2022; 44:492-499. [PMID: 35332839 DOI: 10.1080/08923973.2022.2054428] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Doxorubicin (DOX) resistance remains a major challenge for adriamycin-based treatment of breast cancer (BC). Transforming growth factor β (TGF-β) has been reported to contribute to drug resistance. Although the role of long noncoding RNAs (LncRNAs) in cancer progression has been widely studied, its effect on TGF-β-induced resistance remains limited. This study aimed to investigate the role of LncRNA on the regulation of TGF-β-induced drug resistance. METHODS Cell counting kit-8 (CCK-8) and an EdU assay were used to evaluate cell viability and proliferation. The level of LncRNA mRNA expression in BC tissues and cells was examined by quantitative real-time PCR. Changes in epithelial-mesenchymal transition (EMT) and cell apoptosis were quantified by Western blot and immunofluorescence. RESULTS TGF-β induced EMT and promoted DOX resistance. LncRNA urothelial carcinoma-associated 1(lncRNA UCA1) associated with TGF-β was upregulated in BC cells and tissues. LncRNA UCA1 silencing enhanced sensitivity to DOX decreased cellular proliferation and increased apoptosis in BC cells. The effect of TGF-β on EMT and DOX resistance disappeared following a lncRNA UCA1 knockdown. CONCLUSIONS These findings suggest that lncRNA-UCA1, a mediator of TGF-β signaling, could predispose BC patients to EMT and DOX resistance.
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Affiliation(s)
- Like Wo
- Key Laboratory of Integrative Chinese and Western Medicine for the Diagnosis and Treatment of Circulatory Diseases of Zhejiang Province, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
| | - Bei Zhang
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
| | - Xiongbin You
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
| | - Yuanyuan Hu
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
| | - Zhenqi Gu
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
| | - Mengning Zhang
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
| | - Qi Wang
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
| | - Zhengyi Lv
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
| | - Hong Zhao
- Department of Breast Surgery, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P.R. China
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Ding L, Wo L, Du Z, Tang L, Song Z, Dou X. Danshen protects against early-stage alcoholic liver disease in mice via inducing PPARα activation and subsequent 4-HNE degradation. PLoS One 2017; 12:e0186357. [PMID: 29020055 PMCID: PMC5636149 DOI: 10.1371/journal.pone.0186357] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 09/30/2017] [Indexed: 12/16/2022] Open
Abstract
Alcoholic liver disease (ALD) is a type of chronic liver disease caused by long-term heavy ethanol consumption. Danshen is one of the most commonly used substances in traditional Chinese medicine and has been widely used for the treatment of various diseases, and most frequently, the ALD. The current study aims to determine the potential beneficial effect of Danshen administration on ALD and to clarify the underlying molecular mechanisms. Danshen administration improved liver pathologies of ALD, attenuated alcohol-induced increment of hepatic 4-Hydroxynonenal (4-HNE) formation, and prevented hepatic Peroxisome proliferators activated receptor alpha (PPARα) suppression in response to chronic alcohol consumption. Cell culture studies revealed that both hepatoprotective effect and increased intracellular 4-HNE clearance instigated by Danshen supplementation are PPARα-dependent. In conclusion, Danshen administration can protect against ALD via inducing PPARα activation and subsequent 4-HNE degradation.
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Affiliation(s)
- Lei Ding
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, P. R. China
| | - Like Wo
- Zhejiang Provincial Hospital of Traditional Chinese Medical, Hangzhou, P. R. China
| | - Zhongyan Du
- Zhejiang Chinese Medical University, Hangzhou, Zhejiang, P. R. China
| | - Lihua Tang
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, P. R. China
| | - Zhenyuan Song
- Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Xiaobing Dou
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, P. R. China
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Zhao H, Kang X, Xia X, Wo L, Gu X, Hu Y, Xie X, Chang H, Lou L, Shen X. miR-145 suppresses breast cancer cell migration by targeting FSCN-1 and inhibiting epithelial-mesenchymal transition. Am J Transl Res 2016; 8:3106-3114. [PMID: 27508031 PMCID: PMC4969447] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 02/12/2016] [Indexed: 06/06/2023]
Abstract
MicroRNAs (miRNAs), small non-coding RNAs, regulate fundamental cellular and developmental processes such as cell growth, apoptosis, migration, and invasion. In our present study, we investigated the inhibitory role of miR-145 on breast cancer cell migration as well as its underlying mechanism. Wound healing assay and transwell migration assay showed that ectopic expression of miR-145 significantly inhibited breast cancer cell migration. Bioinformatics analysis revealed that FSCN-1 was a putative target of miR-145. The expression of FSCN-1 varied among four different breast cancer cells, and inversely correlated with miR-145 levels. Moreover, miR-145 mimic transfection enhanced the expression of FSCN-1 in Bcap-37 and HCC-1937 cells. We also found that siRNA- mediated down-regulation of FSCN-1 inhibited cell motility in breast cancer cells. In addition, we found that up-regulation of miR-145 blocked EMT and decreased the expression of MMP-2/9 in breast cancer cells. These results reveal a new link between miR-145, FSCN-1 and EMT in the regulation of breast cancer migration.
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Affiliation(s)
- Hong Zhao
- Department of Breast Surgery, First Affiliated Hospital of Zhejiang Chinese Medical UniversityYoudian Road 54#, Shangcheng District, Hangzhou City 310006, Zhejiang Province, China
| | - Xing Kang
- Department of General Surgery, The Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008, Jiangsu Province, China
| | - Xuefeng Xia
- Department of General Surgery, The Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008, Jiangsu Province, China
| | - Like Wo
- Department of Breast Surgery, First Affiliated Hospital of Zhejiang Chinese Medical UniversityYoudian Road 54#, Shangcheng District, Hangzhou City 310006, Zhejiang Province, China
| | - Xidong Gu
- Department of Breast Surgery, First Affiliated Hospital of Zhejiang Chinese Medical UniversityYoudian Road 54#, Shangcheng District, Hangzhou City 310006, Zhejiang Province, China
| | - Yuanyuan Hu
- Department of Breast Surgery, First Affiliated Hospital of Zhejiang Chinese Medical UniversityYoudian Road 54#, Shangcheng District, Hangzhou City 310006, Zhejiang Province, China
| | - Xiaohong Xie
- Department of Breast Surgery, First Affiliated Hospital of Zhejiang Chinese Medical UniversityYoudian Road 54#, Shangcheng District, Hangzhou City 310006, Zhejiang Province, China
| | - Helena Chang
- Department of Surgery, Revlon/UCLA Breast Canter, David Geffen School of MedicineLos Angeles, CA, USA
| | - Lihua Lou
- Department of Breast Surgery, First Affiliated Hospital of Zhejiang Chinese Medical UniversityYoudian Road 54#, Shangcheng District, Hangzhou City 310006, Zhejiang Province, China
| | - Xuning Shen
- Department of Surgery, The First Hospital of Jiaxing1882 Zhong’huan’nan Road, Jiaxing 314000, Zhejiang Province, China
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Borges TJ, O’Malley JT, Wo L, Murakami N, Smith B, Azzi J, Tripathi S, Lane JD, Bueno EM, Clark RA, Tullius SG, Chandraker A, Lian CG, Murphy GF, Strom TB, Pomahac B, Najafian N, Riella LV. Codominant Role of Interferon-γ- and Interleukin-17-Producing T Cells During Rejection in Full Facial Transplant Recipients. Am J Transplant 2016; 16:2158-71. [PMID: 26749226 PMCID: PMC4979599 DOI: 10.1111/ajt.13705] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [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: 07/29/2015] [Revised: 12/23/2015] [Accepted: 12/27/2015] [Indexed: 01/25/2023]
Abstract
Facial transplantation is a life-changing procedure for patients with severe composite facial defects. However, skin is the most immunogenic of all transplants, and better understanding of the immunological processes after facial transplantation is of paramount importance. Here, we describe six patients who underwent full facial transplantation at our institution, with a mean follow-up of 2.7 years. Seum, peripheral blood mononuclear cells, and skin biopsy specimens were collected prospectively, and a detailed characterization of their immune response (51 time points) was performed, defining 47 immune cell subsets, 24 serum cytokines, anti-HLA antibodies, and donor alloreactivity on each sample, producing 4269 data points. In a nonrejecting state, patients had a predominant T helper 2 cell phenotype in the blood. All patients developed at least one episode of acute cellular rejection, which was characterized by increases in interferon-γ/interleukin-17-producing cells in peripheral blood and in the allograft's skin. Serum monocyte chemotactic protein-1 level was significantly increased during rejection compared with prerejection time points. None of the patients developed de novo donor-specific antibodies, despite a fourfold expansion in T follicular helper cells at 1 year posttransplantation. In sum, facial transplantation is frequently complicated by a codominant interferon-γ/interleukin-17-mediated acute cellular rejection process. Despite that, medium-term outcomes are promising with no evidence of de novo donor-specific antibody development.
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Affiliation(s)
- T. J. Borges
- Schuster Transplantation Research Center, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - J. T. O’Malley
- Department of Dermatology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - L. Wo
- Division of Plastic Surgery, Department of Surgery, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - N. Murakami
- Schuster Transplantation Research Center, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - B. Smith
- Schuster Transplantation Research Center, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - J. Azzi
- Schuster Transplantation Research Center, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - S. Tripathi
- Schuster Transplantation Research Center, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - J. D. Lane
- Division of Plastic Surgery, Department of Surgery, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - E. M. Bueno
- Division of Plastic Surgery, Department of Surgery, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - R. A. Clark
- Department of Dermatology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA
| | - S. G. Tullius
- Division of Transplant Surgery, Department of Surgery, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - A. Chandraker
- Schuster Transplantation Research Center, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - C. G. Lian
- Program in Dermatopathology, Department of Pathology, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - G. F. Murphy
- Program in Dermatopathology, Department of Pathology, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - T. B. Strom
- Transplant Institute, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
| | - B. Pomahac
- Division of Plastic Surgery, Department of Surgery, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA
| | - N. Najafian
- Schuster Transplantation Research Center, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA,Department of Nephrology, Cleveland Clinic Florida, Weston, FL
| | - L. V. Riella
- Schuster Transplantation Research Center, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA,Corresponding author: Leonardo V. Riella,
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Kueckelhaus M, Turk M, Kumamaru KK, Wo L, Bueno EM, Lian CG, Alhefzi M, Aycart MA, Fischer S, De Girolami U, Murphy GF, Rybicki FJ, Pomahac B. Transformation of Face Transplants: Volumetric and Morphologic Graft Changes Resemble Aging After Facial Allotransplantation. Am J Transplant 2016; 16:968-78. [PMID: 26639618 DOI: 10.1111/ajt.13544] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 06/17/2015] [Revised: 09/03/2015] [Accepted: 09/18/2015] [Indexed: 01/25/2023]
Abstract
Facial allotransplantation restores normal anatomy to severely disfigured faces. Although >30 such operations performed worldwide have yielded promising short-term results, data on long-term outcomes remain scarce. Three full-face transplant recipients were followed for 40 months. Severe changes in volume and composition of the facial allografts were noted. Data from computed tomography performed 6, 18 and 36 months after transplantation were processed to separate allograft from recipient tissues and further into bone, fat and nonfat soft tissues. Skin and muscle biopsies underwent diagnostic evaluation. All three facial allografts sustained significant volume loss (mean 19.55%) between 6 and 36 months after transplant. Bone and nonfat soft tissue volumes decreased significantly over time (17.22% between months 6 and 18 and 25.56% between months 6 and 36, respectively), whereas fat did not. Histological evaluations showed atrophy of muscle fibers. Volumetric and morphometric changes in facial allografts have not been reported previously. The transformation of facial allografts in this study resembled aging through volume loss but differed substantially from regular aging. These findings have implications for risk-benefit assessment, donor selection and measures counteracting muscle and bone atrophy. Superior long-term outcomes of facial allotransplantation will be crucial to advance toward future clinical routine.
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Affiliation(s)
- M Kueckelhaus
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.,Department of Plastic Surgery, BG University Hospital Bergmannsheil, Ruhr University Bochum, Bochum, Germany
| | - M Turk
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - K K Kumamaru
- Applied Imaging Science Laboratory, Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - L Wo
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - E M Bueno
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - C G Lian
- Division of Dermatopathology, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - M Alhefzi
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - M A Aycart
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - S Fischer
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.,Department of Plastic Surgery, BG University Hospital Ludwigshafen, Heidelberg University, Ludwigshafen, Germany
| | - U De Girolami
- Division of Neuropathology, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - G F Murphy
- Division of Dermatopathology, Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - F J Rybicki
- Applied Imaging Science Laboratory, Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - B Pomahac
- Division of Plastic Surgery, Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
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Yu X, Gao R, Yin L, Wo L. [The effects of low polarity ginsenoside Rh4 on proliferation and differentiation in K562 leukemia cells]. Zhonghua Xue Ye Xue Za Zhi 2015; 36:347-9. [PMID: 25916302 PMCID: PMC7342623 DOI: 10.3760/cma.j.issn.0253-2727.2015.04.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaoling Yu
- The First Affiliated Hospital of Zhejiang Chinese Medicine University, Hangzhou 310006, China
| | - Ruilan Gao
- The First Affiliated Hospital of Zhejiang Chinese Medicine University, Hangzhou 310006, China
| | - Liming Yin
- The First Affiliated Hospital of Zhejiang Chinese Medicine University, Hangzhou 310006, China
| | - Like Wo
- The First Affiliated Hospital of Zhejiang Chinese Medicine University, Hangzhou 310006, China
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Chen S, Tang Y, Qian Y, Chen R, Zhang L, Wo L, Chai H. Allicin prevents H₂O₂-induced apoptosis of HUVECs by inhibiting an oxidative stress pathway. BMC Complement Altern Med 2014; 14:321. [PMID: 25174844 PMCID: PMC4158076 DOI: 10.1186/1472-6882-14-321] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 08/27/2014] [Indexed: 11/10/2022]
Abstract
Background Allicin, a primary ingredient of garlic, has been proposed to possess cardioprotective properties, which are commonly mediated by improved endothelial function. Methods To investigate the effect and mechanism of allicin on the apoptosis of human umbilical vein endothelial cells (HUVECs), we used Propidium iodide (PI) staining and Annexin V/ PI staining assays to establish a model of oxidative stress apoptosis induced by H2O2. MTT, RT-PCR and western-blot assays were used to detect the effects and mechanism of allicin on the model. Results PI staining, Annexin V/ PI staining assays and morphological assessment suggest that the cell death induced by 0.5 mM H2O2 is primarily apoptotic. Conversely, allicin reverses the effect of H2O2 on cell death, suggesting a role in protecting HUVECs from apoptosis. We demonstrated that H2O2 activates PARP cleavage, reduces pro-Caspase-3 levels and activates Bax expression; however, allicin inhibits each of these apoptotic signaling indicators. Allicin also reduces the levels of malondialdehyde and increases the levels of superoxide dismutase, nitric oxide release and endothelial nitric oxide synthase mRNA, but has no significant effect on inducible nitric oxide synthase mRNA levels. Conclusion These results demonstrate that allicin has powerful effects in protecting HUVECs from apoptosis and suggest that protection occurs via a mechanism involving the protection from H2O2-mediated oxidative stress.
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Lu D, Wo X, Wo L, Li Y, Tang L, Yang Z. [Effects of warm and tonify kidney-yang herbs on liver mitochondria proteome of kidney-yang deficiency rats]. Zhongguo Zhong Yao Za Zhi 2009; 34:1251-1256. [PMID: 19673389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To study the effects of warm and tonify kidney-yang herbs on the liver mitochondria proteome of the thyroidectomized kidney-yang deficiency rats. METHOD Twelve rats were divided into normal group, model group and treated group; each group had four rats. The rats of model group and treated group were excised the two side thyroid gland, and the rats of normal group were done the homologous operation, but didn't excise the thyroid gland. After seven days, the rats of model group and treated group appeared the symptoms of kidney-yang deficiency. From the eighth day, the rats of treated group were fed warm and tonify kidney-yang herbs 6.7 g x kg(-1) once daily, and the rats of other two groups were fed the equal normal. All rats of three groups were killed by decollation after six days of treatment, and liver mitochondria proteins were separated. Each liver mitochondria protein sample was labeled with Cy3 or Cy5 randomly, and one Cy3-labeled sample and one Cy5-labeled sample were mixed on the same 2-D gel along with a Cy2-labeled mixture of all samples as an internal standard and run on the same gel. The gels were scanned under different wavelength light after electrophoresis. All images were analyzed by DeCyder 6. 5 software, and the different proteins were identified by mass spectrum. RESULT The expression of HSP60, catalase, glutathione peroxidase, carbamoylphosphate synthetase I, ATP synthase, lactotransferrin, H(+)-transporting two-sector ATPase, alpha-ETF and calpain 12 were increased in the thyroidectomized kidney-yang deficiency rats, while the expression of oxoisovalerate dehydrogenase, Acyl-CoA dehydrogenase, ornithine aminotransferase, and GTP-binding regulatory protein were decreased. After the kidney-yang deficiency rats were treated with warm and tonify kidney-yang herbs, the expression of HSP60, catalase, glutathione peroxidase, oxoisovalerate dehydrogenase, Acyl-CoA dehydrogenase, ATP synthase, lacto-transferrin, H(+)-transporting two-sector ATPase, alpha-ETF and GTP-binding regulatory protein were increased, and the expression of carbamoyl-phosphate synthetase I and calpain 12 were decreased. CONCLUSION The warm and tonify kidney-yang herbs perform its therapeutical effect by regulating the metabolism, protecting the stability of mitochondrial membrance and maintaining the signal conduction in the cells.
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Affiliation(s)
- Dezhao Lu
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou 310053, China
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Dou X, Fan C, Wo L, Yan J, Qian Y, Wo X. Curcumin up-regulates LDL receptor expression via the sterol regulatory element pathway in HepG2 cells. Planta Med 2008; 74:1374-1379. [PMID: 18704882 DOI: 10.1055/s-2008-1081316] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Plasma low-density lipoprotein-cholesterol (LDL-C) is mainly taken up and cleared by the hepatocellular LDL receptor (LDL-R). LDL-R gene expression is regulated by the sterol regulatory element binding proteins (SREBPs). Previous studies have shown that curcumin reduces plasma LDL-C and has hypolipidemic and anti-atherosclerotic effects. Herein, we investigated the effect of curcumin on LDL-R expression and its molecular mechanism in HepG2 cells. Curcumin increased LDL-R expression (mRNA and protein) and the resultant uptake of DiI-LDL in a dose- and time-dependent manner. Using a GFP reporter system in a transfected HepG2/SRE-GFP cell line, we found that curcumin activated the sterol regulatory element of the LDL-R promoter. In HepG2/Insig2 cells, curcumin reversed the inhibition of LDL-R expression induced by Insig2 overexpression. These data demonstrate that curcumin increases LDL-R protein expression and uptake activity via the SREBPs pathway. These findings contribute to our further understanding of the cholesterol-lowering and anti-atherosclerotic effects of curcumin.
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Affiliation(s)
- Xiaobing Dou
- Life Science College of Zhejiang Chinese Medical University, Hangzhou, Zhejiang Province, P. R. China
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