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Yin Z, Gao Y, Bu X, Wang J, Yao Z, Liu Q, Zhang Y, Yu G, Ping B. Homoharringtonine sensitized resistant acute myeloid leukemia cells to venetoclax-induced apoptosis. Leuk Lymphoma 2024:1-13. [PMID: 39235111 DOI: 10.1080/10428194.2024.2400228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 08/28/2024] [Accepted: 08/29/2024] [Indexed: 09/06/2024]
Abstract
Venetoclax (VEN), a B-cell lymphoma 2 (BCL-2) selective inhibitor, is widely used for treating acute myeloid leukemia (AML) with promising results. However, the anti-leukemic effect of VEN in relapsed/refractory (R/R)- AML requires improvement. In this study, we observed that combining homoharringtonine (HHT) with VEN plus azacitidine resulted in a significantly higher response and better survival than VA alone in patients with R/R-AML. Basic research indicates that HHT combined with VEN has a highly synergistic effect against both resistant AML cells and primary cells with/without mesenchymal stem cell (MSC) co-culture in vivo, inhibiting proliferation and colony-forming capacity of AML cells associated with concomitant cell cycle arrest. Mechanistically, HHT sensitizes AML cells to VEN by downregulating the anti-apoptotic proteins MCL-1/BCL-xL, activating reactive oxygen species (ROS), leading to mitochondrial membrane potential loss, and attenuating fatty acid (FA) uptake. These findings adding HHT to VEN-based regimens may enhance outcomes in R/R-AML patients.
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Affiliation(s)
- Zhao Yin
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
- Department of Hematology, Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
| | - Ya Gao
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangdong, P.R. China
| | - Xiaoyin Bu
- Department of Hematology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong, P.R. China
| | - Junhui Wang
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
| | - Zurong Yao
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
| | - Qifa Liu
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
- Clinical Medical Research Center of Hematological Diseases of Guangdong Province, Guangzhou, Guangdong, P.R. China
| | - Yu Zhang
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
- Clinical Medical Research Center of Hematological Diseases of Guangdong Province, Guangzhou, Guangdong, P.R. China
| | - Guopan Yu
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
- Clinical Medical Research Center of Hematological Diseases of Guangdong Province, Guangzhou, Guangdong, P.R. China
| | - Baohong Ping
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
- Department of Hematology, Huiqiao Medical Center, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P.R. China
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Pilátová MB, Solárová Z, Mezencev R, Solár P. Ceramides and their roles in programmed cell death. Adv Med Sci 2023; 68:417-425. [PMID: 37866204 DOI: 10.1016/j.advms.2023.10.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 08/14/2023] [Accepted: 10/13/2023] [Indexed: 10/24/2023]
Abstract
Programmed cell death plays a crucial role in maintaining the homeostasis and integrity of multicellular organisms, and its dysregulation contributes to the pathogenesis of many diseases. Programmed cell death is regulated by a range of macromolecules and low-molecular messengers, including ceramides. Endogenous ceramides have different functions, that are influenced by their localization and the presence of their target molecules. This article provides an overview of the current understanding of ceramides and their impact on various types of programmed cell death, including apoptosis, anoikis, macroautophagy and mitophagy, and necroptosis. Moreover, it highlights the emergence of dihydroceramides as a new class of bioactive sphingolipids and their downstream targets as well as their future roles in cancer cell growth, drug resistance and tumor metastasis.
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Affiliation(s)
- Martina Bago Pilátová
- Department of Pharmacology, Faculty of Medicine, P.J. Šafárik University, Košice, Slovak Republic
| | - Zuzana Solárová
- Department of Pharmacology, Faculty of Medicine, P.J. Šafárik University, Košice, Slovak Republic
| | - Roman Mezencev
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Peter Solár
- Department of Medical Biology, Faculty of Medicine, P.J. Šafárik University, Košice, Slovak Republic.
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3
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SWATH-MS-Based Proteomics Reveals the Regulatory Metabolism of Amaryllidaceae Alkaloids in Three Lycoris Species. Int J Mol Sci 2023; 24:ijms24054495. [PMID: 36901927 PMCID: PMC10002500 DOI: 10.3390/ijms24054495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 02/14/2023] [Accepted: 02/15/2023] [Indexed: 03/03/2023] Open
Abstract
Alkaloids are a class of nitrogen-containing alkaline organic compounds found in nature, with significant biological activity, and are also important active ingredients in Chinese herbal medicine. Amaryllidaceae plants are rich in alkaloids, among which galanthamine, lycorine, and lycoramine are representative. Since the difficulty and high cost of synthesizing alkaloids have been the major obstacles in industrial production, particularly the molecular mechanism underlying alkaloid biosynthesis is largely unknown. Here, we determined the alkaloid content in Lycoris longituba, Lycoris incarnata, and Lycoris sprengeri, and performed a SWATH-MS (sequential window acquisition of all theoretical mass spectra)-based quantitative approach to detect proteome changes in the three Lycoris. A total of 2193 proteins were quantified, of which 720 proteins showed a difference in abundance between Ll and Ls, and 463 proteins showed a difference in abundance between Li and Ls. KEGG enrichment analysis revealed that differentially expressed proteins are distributed in specific biological processes including amino acid metabolism, starch, and sucrose metabolism, implicating a supportive role for Amaryllidaceae alkaloids metabolism in Lycoris. Furthermore, several key genes collectively known as OMT and NMT were identified, which are probably responsible for galanthamine biosynthesis. Interestingly, RNA processing-related proteins were also abundantly detected in alkaloid-rich Ll, suggesting that posttranscriptional regulation such as alternative splicing may contribute to the biosynthesis of Amaryllidaceae alkaloids. Taken together, our SWATH-MS-based proteomic investigation may reveal the differences in alkaloid contents at the protein levels, providing a comprehensive proteome reference for the regulatory metabolism of Amaryllidaceae alkaloids.
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Watari A, Fujiwara K, Yagi K, Tachibana K, Katsurada T, Myoui A, Kondoh M. Homoharringtonine is a transdermal granular permeation enhancer. Biochem Biophys Res Commun 2022; 616:140-144. [PMID: 35679696 DOI: 10.1016/j.bbrc.2022.04.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 04/12/2022] [Accepted: 04/14/2022] [Indexed: 11/02/2022]
Abstract
Although modulation of claudin-1-based tight junction (TJ) in stratum granulosum is an option for transdermal absorption of drugs, granular permeation enhancers have never been developed. We previously found that homoharringtonine (HHT), a natural alkanoid, weakened intestinal epithelial barrier with changing expression and cellular localization of TJ components such as claudin-1 and claudin-4. In the present study, we investigated whether HHT is an epidermal granular permeation enhancer. Treatment of normal human epidermal keratinocytes (NHEK) cells with HHT decreased claudin-1 and claudin-4 but not zonula occludens-1 and E-cadherin. HHT lowered TJ-integrity in NHEK cells, accompanied by permeation-enhancement of dextran (4 kDa) in a dose-dependent manner. Transdermal treatment of mice with HHT weakened epidermal barrier. HHT treatment enhanced transdermal absorption of dextran with a molecular mass of up to 10 kDa. Together, HHT may be a transdermal absorption enhancer.
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Affiliation(s)
- Akihiro Watari
- Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan; Department of Medical Innovation, Osaka University Hospital, Osaka, Japan.
| | - Kana Fujiwara
- Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
| | - Kiyohito Yagi
- Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
| | - Keisuke Tachibana
- Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
| | | | - Akira Myoui
- Department of Medical Innovation, Osaka University Hospital, Osaka, Japan
| | - Masuo Kondoh
- Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
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Hu Y, Rong R, Wang Y, Yan S, Liu S, Wang L. Downregulating EVA1C exerts the potential to promote neuron growth after neonatal hypoxic-ischemic encephalopathy injury associated with alternative splicing. IBRAIN 2022; 8:481-491. [PMID: 37786591 PMCID: PMC10529346 DOI: 10.1002/ibra.12053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 06/22/2022] [Accepted: 06/24/2022] [Indexed: 10/04/2023]
Abstract
Neonatal hypoxic-ischemic encephalopathy (NHIE) is one of the major diseases in newborns during the perinatal stage, which globally is the main reason for children's morbidity and mortality. However, the mechanism of NHIE still remains poorly clear. In this study, the 7-day-old rats were subjected to hypoxic-ischemia (HI), then brain damage was detected. Afterward, the expression of eva-1 homolog C (EVA1C) was measured in vitro by establishing the oxygen-glucose deprivation (OGD) model in SHSY5Y cells and human fetal neurons. Subsequently, the potential function and mechanism of EVA1C were explored by silencing EVA1C and alternative splicing prediction. As a result, obvious neurobehavioral impairment and brain infarction were detected through Zea-Longa score and TTC staining; meanwhile, neuron injury was tested by HE and Nissl staining post HI. Moreover, it was found that the expression of EVA1C was notably upregulated in SHSY5Y cells and human fetal neurons after OGD. In addition, cell survival and growth were increased after silencing EVA1C, which might be associated with alternative splicing. In conclusion, EVA1C interference exhibited potential in promoting neuron survival and growth, associated with exon skipping with the alternative splicing site in 34613318:34687258, which may provide the basis for the therapeutic target and mechanism research of NHIE.
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Affiliation(s)
- Yue Hu
- Department of Anesthesia OperationThe First People's Hospital of Shuangliu DistrictChengduSichuanChina
| | - Rong Rong
- Division of Life Sciences and Medicine, The First Affiliated Hospital of USTCUniversity of Science and Technology of ChinaHefeiAnhuiChina
| | - Yi Wang
- Animal Zoology DepartmentKunming Medical UniversityKunmingYunnanChina
| | - Shan‐Shan Yan
- Animal Zoology DepartmentKunming Medical UniversityKunmingYunnanChina
| | - Su Liu
- Center for Epigenetics and Induced Pluripotent Stem Cells, Kennedy Krieger InstituteJohns Hopkins UniversityBaltimoreMarylandUSA
| | - Lei Wang
- Animal Zoology DepartmentKunming Medical UniversityKunmingYunnanChina
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6
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Tilaoui M, Ait Mouse H, Zyad A. Update and New Insights on Future Cancer Drug Candidates From Plant-Based Alkaloids. Front Pharmacol 2021; 12:719694. [PMID: 34975465 PMCID: PMC8716855 DOI: 10.3389/fphar.2021.719694] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 11/23/2021] [Indexed: 02/06/2023] Open
Abstract
Cancer is a complex multifactorial disease that results from alterations in many physiological and biochemical functions. Over the last few decades, it has become clear that cancer cells can acquire multidrug resistance to conventional anticancer drugs, resulting in tumor relapse. Thus, there is a continuous need to discover new and effective anticancer drugs. Natural products from plants have served as a primary source of cancer drugs and continue to provide new plant-derived anticancer drugs. The present review describes plant-based alkaloids, which have been reported as active or potentially active in cancer treatment within the past 4 years (2017-2020), both in preclinical research and/or in clinical trials. In addition, recent insights into the possible molecular mechanism of action of alkaloid prodrugs naturally present in plants are also highlighted.
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Affiliation(s)
- Mounir Tilaoui
- Experimental Oncology and Natural Substances Team, Cellular and Molecular Immuno-pharmacology, Faculty of Sciences and Technology, Sultan Moulay Slimane University, Beni-Mellal, Morocco
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Zhang Y, Xiang J, Zhu N, Ge H, Sheng X, Deng S, Chen J, Yu L, Zhou Y, Shen J. Curcumin in Combination With Omacetaxine Suppress Lymphoma Cell Growth, Migration, Invasion, and Angiogenesis via Inhibition of VEGF/Akt Signaling Pathway. Front Oncol 2021; 11:656045. [PMID: 34458134 PMCID: PMC8386016 DOI: 10.3389/fonc.2021.656045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 07/12/2021] [Indexed: 01/04/2023] Open
Abstract
Background Both omacetaxine (HHT) and curcumin were shown to exhibit anti-proliferative effect on lymphoma cells. However, the role of combination of HHT with curcumin (HHT/curcumin combination) on lymphoma cells remains unclear. Thus, this study aimed to investigate the effect of HHT/curcumin combination on the proliferation, migration, and angiogenesis of lymphoma cells. Methods Cell counting kit-8 (CCK-8), Ki67 immunofluorescence and transwell assays were used to assess the viability, proliferation and migration of U937 and Raji cells respectively. In addition, tube formation assay was used to determine the effects of HHT/curcumin combination on angiogenesis in human umbilical vein endothelial cells (HUVECs). Results In this study, we found that HHT/curcumin combination significantly inhibited the proliferation, migration and invasion in U937 and Raji cells (all P < 0.01). In addition, combination treatment markedly inhibited the secreted levels of vascular endothelial growth factor (VEGF)-(A-D) (all P < 0.01) in Raji cells. Moreover, combination treatment exhibited anti-tumor effects in Raji cells, as shown by the decreased signals of phosphorylated VEGF receptor 2 (p-VEGFR2) and phosphorylated protein kinase B (p-Akt) (all P < 0.01). Meanwhile, combination treatment inhibited VEGFA levels (P < 0.01) in exosomes derived from Raji cells. Application of exosomes with downregulated VEGF to HUVECs notably inhibited proliferation, migration and tube formation of HUVECs, evidenced by the decreased signals of p-Akt, angiogenin-1, matrix metallopeptidase 2 (MMP2) and matrix metallopeptidase 9 (MMP9) (all P < 0.01). Conclusion Our findings indicated that combination of HHT and curcumin could inhibit lymphoma cell growth and angiogenesis via inhibition of VEGF/Akt signaling pathway. These results suggested that HHT combined with curcumin might be regarded as a promising therapeutic approach for the treatment of lymphoma.
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Affiliation(s)
- Yu Zhang
- Department of Hematology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Jingjing Xiang
- Department of Hematology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Ni Zhu
- Department of Hematology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Hangping Ge
- Department of Hematology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Xianfu Sheng
- Department of Hematology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Shu Deng
- Department of Hematology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Junfa Chen
- Department of Hematology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
| | - Lihong Yu
- First Medical College, Zhejiang Chinese Medical University, Hangzhou, China
| | - Yan Zhou
- First Medical College, Zhejiang Chinese Medical University, Hangzhou, China
| | - Jianping Shen
- Department of Hematology, First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China
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8
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Chen Y, Lear TB, Evankovich JW, Larsen MB, Lin B, Alfaras I, Kennerdell JR, Salminen L, Camarco DP, Lockwood KC, Tuncer F, Liu J, Myerburg MM, McDyer JF, Liu Y, Finkel T, Chen BB. A high-throughput screen for TMPRSS2 expression identifies FDA-approved compounds that can limit SARS-CoV-2 entry. Nat Commun 2021; 12:3907. [PMID: 34162861 PMCID: PMC8222394 DOI: 10.1038/s41467-021-24156-y] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 06/07/2021] [Indexed: 02/06/2023] Open
Abstract
SARS-CoV-2 (2019-nCoV) is the pathogenic coronavirus responsible for the global pandemic of COVID-19 disease. The Spike (S) protein of SARS-CoV-2 attaches to host lung epithelial cells through the cell surface receptor ACE2, a process dependent on host proteases including TMPRSS2. Here, we identify small molecules that reduce surface expression of TMPRSS2 using a library of 2,560 FDA-approved or current clinical trial compounds. We identify homoharringtonine and halofuginone as the most attractive agents, reducing endogenous TMPRSS2 expression at sub-micromolar concentrations. These effects appear to be mediated by a drug-induced alteration in TMPRSS2 protein stability. We further demonstrate that halofuginone modulates TMPRSS2 levels through proteasomal-mediated degradation that involves the E3 ubiquitin ligase component DDB1- and CUL4-associated factor 1 (DCAF1). Finally, cells exposed to homoharringtonine and halofuginone, at concentrations of drug known to be achievable in human plasma, demonstrate marked resistance to SARS-CoV-2 infection in both live and pseudoviral in vitro models. Given the safety and pharmacokinetic data already available for the compounds identified in our screen, these results should help expedite the rational design of human clinical trials designed to combat active COVID-19 infection.
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Affiliation(s)
- Yanwen Chen
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
- Department of Gastroenterology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Travis B Lear
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, USA
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA
| | - John W Evankovich
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, USA
| | - Mads B Larsen
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
| | - Bo Lin
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
| | - Irene Alfaras
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
| | | | - Laura Salminen
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
| | - Daniel P Camarco
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
| | | | - Ferhan Tuncer
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
| | - Jie Liu
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA
| | - Michael M Myerburg
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, USA
| | - John F McDyer
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, USA
| | - Yuan Liu
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA.
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, USA.
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Toren Finkel
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA.
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA.
- Department of Medicine, Division of Cardiology, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Bill B Chen
- Aging Institute, University of Pittsburgh/UPMC, Pittsburgh, PA, USA.
- Department of Medicine, Acute Lung Injury Center of Excellence, University of Pittsburgh, Pittsburgh, PA, USA.
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, USA.
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9
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Dou Z, Zhao D, Chen X, Xu C, Jin X, Zhang X, Wang Y, Xie X, Li Q, Di C, Zhang H. Aberrant Bcl-x splicing in cancer: from molecular mechanism to therapeutic modulation. J Exp Clin Cancer Res 2021; 40:194. [PMID: 34118966 PMCID: PMC8196531 DOI: 10.1186/s13046-021-02001-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 05/30/2021] [Indexed: 12/13/2022] Open
Abstract
Bcl-x pre-mRNA splicing serves as a typical example to study the impact of alternative splicing in the modulation of cell death. Dysregulation of Bcl-x apoptotic isoforms caused by precarious equilibrium splicing is implicated in genesis and development of multiple human diseases, especially cancers. Exploring the mechanism of Bcl-x splicing and regulation has provided insight into the development of drugs that could contribute to sensitivity of cancer cells to death. On this basis, we review the multiple splicing patterns and structural characteristics of Bcl-x. Additionally, we outline the cis-regulatory elements, trans-acting factors as well as epigenetic modifications involved in the splicing regulation of Bcl-x. Furthermore, this review highlights aberrant splicing of Bcl-x involved in apoptosis evade, autophagy, metastasis, and therapy resistance of various cancer cells. Last, emphasis is given to the clinical role of targeting Bcl-x splicing correction in human cancer based on the splice-switching oligonucleotides, small molecular modulators and BH3 mimetics. Thus, it is highlighting significance of aberrant splicing isoforms of Bcl-x as targets for cancer therapy.
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Affiliation(s)
- Zhihui Dou
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Dapeng Zhao
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Xiaohua Chen
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Caipeng Xu
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Xiaodong Jin
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China
| | - Xuetian Zhang
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 101408, China
| | - Yupei Wang
- Medical Genetics Center of Gansu Maternal and Child Health Care Center, Lanzhou, 730000, China
| | - Xiaodong Xie
- School of Basic Medical Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Qiang Li
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 101408, China
- Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, 516029, China
| | - Cuixia Di
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China.
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China.
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 101408, China.
- Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, 516029, China.
| | - Hong Zhang
- Department of Heavy Ion Radiation Medicine, Bio-Medical Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou, 730000, China.
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 101408, China.
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 101408, China.
- Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, 516029, China.
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10
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Ethnopharmacology, chemodiversity, and bioactivity of Cephalotaxus medicinal plants. Chin J Nat Med 2021; 19:321-338. [PMID: 33941338 DOI: 10.1016/s1875-5364(21)60032-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Indexed: 12/16/2022]
Abstract
Cephalotaxus is the only genus of Cephalotaxaceae family, and its natural resources are declining due to habitat fragmentation, excessive exploitation and destruction. In many areas of China, folk herbal doctors traditionally use Cephalotaxus plants to treat innominate swollen poison, many of which are cancer. Not only among Han people, but also among minority ethnic groups, Cephalotaxus is used to treat various diseases, e.g., cough, internal bleeding and cancer in Miao medicine, bruises, rheumatism and pain in Yao medicine, and ascariasis, hookworm disease, scrofula in She medicine, etc. Medicinal values of some Cephalotaxus species and compounds are acknowledged officially. However, there is a lack of comprehensive review summarizing the ethnomedicinal knowledge of Cephalotaxus, relevant medicinal phytometabolites and their bioactivities. The research progresses in ethnopharmacology, chemodiversity, and bioactivities of Cephalotaxus medicinal plants are reviewed and commented here. Knowledge gaps are pinpointed and future research directions are suggested. Classic medicinal books, folk medicine books, herbal manuals and ethnomedicinal publications were reviewed for the genus Cephalotaxus (Sanjianshan in Chinese). The relevant data about ethnobotany, phytochemistry, and pharmacology were collected as comprehensively as possible from online databases including Scopus, NCBI PubMed, Bing Scholar, and China National Knowledge Infrastructure (CNKI). "Cephalotaxus", and the respective species name were used as keywords in database search. The obtained articles of the past six decades were collated and analyzed. Four Cephalotaxus species are listed in the official medicinal book in China. They are used as ethnomedicines by many ethnic groups such as Miao, Yao, Dong, She and Han. Inspirations are obtained from traditional applications, and Cephalotaxus phytometabolites are developed into anticancer reagents. Cephalotaxine-type alkaloids, homoerythrina-type alkaloids and homoharringtonine (HHT) are abundant in Cephalotaxus, e.g., C. lanceolata, C. fortunei var. alpina, C. griffithii, and C. hainanensis, etc. New methods of alkaloid analysis and purification are continuously developed and applied. Diterpenoids, sesquiterpenoids, flavonoids, lignans, phenolics, and other components are also identified and isolated in various Cephalotaxus species. Alkaloids such as HHT, terpenoids and other compounds have anticancer activities against multiple types of human cancer. Cephalotaxus extracts and compounds showed anti-inflammatory and antioxidant activities, immunomodulatory activity, antimicrobial activity and nematotoxicity, antihyperglycemic effect, and bone effect, etc. Drug metabolism and pharmacokinetic studies of Cephalotaxus are increasing. We should continue to collect and sort out folk medicinal knowledge of Cephalotaxus and associated organisms, so as to obtain new enlightenment to translate traditional tips into great therapeutic drugs. Transcriptomics, genomics, metabolomics and proteomics studies can contribute massive information for bioactivity and phytochemistry of Cephalotaxus medicinal plants. We should continue to strengthen the application of state-of-the-art technologies in more Cephalotaxus species and for more useful compounds and pharmacological activities.
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Wang LB, Wang DN, Wu LG, Cao J, Tian JH, Liu R, Ma R, Yu JJ, Wang J, Huang Q, Xiong WY, Zhang X. Homoharringtonine inhibited breast cancer cells growth via miR-18a-3p/AKT/mTOR signaling pathway. Int J Biol Sci 2021; 17:995-1009. [PMID: 33867824 PMCID: PMC8040299 DOI: 10.7150/ijbs.44907] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 02/03/2021] [Indexed: 02/06/2023] Open
Abstract
Homoharringtonine (HHT), a natural alkaloid derived from the cephalotaxus, exhibited its anti-cancer effects in hematological malignancies clinically. However, its pesticide effects and mechanisms in treating solid tumors remain unclear. In this study, we found that HHT was capable of inhibiting tumor growth after 5-days treatment of breast cancer cells, MCF-7, in vivo. Furthemore, HHT also significantly inhibited the cancer cell growth and induced cell apoptosis in vitro. miRNA sequencing proved miR-18a-3p was noticeably downregulated in the cells after HHT treatment. Moreover, downregulating miR-18a-3p increased HHT-induced cell apoptosis; our data supported that HHT suppressed miR-18a-3p expression and inhibited tumorigenesis might via AKT-mTOR signaling pathway. In conclusion: our study proved that HHT suppressed breast cancer cell growth and promoted apoptosis mediated by regulating of the miR-18a-3p-AKT-mTOR signaling pathway, HHT may be a promising antitumor agent in breast cancer treatment.
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Affiliation(s)
- Li-Bin Wang
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Dan-Ni Wang
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China.,Gansu Provincial Hospital, Clinical Laboratory Center, Lanzhou, 730000, China
| | - Li-Gang Wu
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Jia Cao
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Jin-Hai Tian
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Rong Liu
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Rong Ma
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Jing-Jing Yu
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Jia Wang
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Qi Huang
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
| | - Wen-Yong Xiong
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China.,Key Laboratory of Medicinal Chemistry for Natural Resource, Yunnan University, Kunming, 650091, China
| | - Xu Zhang
- The General Hospital of Ningxia Medical University, Biochip Research Center, Yinchuan, 750001, China
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Dual genome-wide CRISPR knockout and CRISPR activation screens identify mechanisms that regulate the resistance to multiple ATR inhibitors. PLoS Genet 2020; 16:e1009176. [PMID: 33137164 PMCID: PMC7660927 DOI: 10.1371/journal.pgen.1009176] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 11/12/2020] [Accepted: 10/02/2020] [Indexed: 12/26/2022] Open
Abstract
The ataxia telangiectasia and Rad3-related (ATR) protein kinase is a key regulator of the cellular response to DNA damage. Due to increased amount of replication stress, cancer cells heavily rely on ATR to complete DNA replication and cell cycle progression. Thus, ATR inhibition is an emerging target in cancer therapy, with multiple ATR inhibitors currently undergoing clinical trials. Here, we describe dual genome-wide CRISPR knockout and CRISPR activation screens employed to comprehensively identify genes that regulate the cellular resistance to ATR inhibitors. Specifically, we investigated two different ATR inhibitors, namely VE822 and AZD6738, in both HeLa and MCF10A cells. We identified and validated multiple genes that alter the resistance to ATR inhibitors. Importantly, we show that the mechanisms of resistance employed by these genes are varied, and include restoring DNA replication fork progression, and prevention of ATR inhibitor-induced apoptosis. In particular, we describe a role for MED12-mediated inhibition of the TGFβ signaling pathway in regulating replication fork stability and cellular survival upon ATR inhibition. Our dual genome-wide screen findings pave the way for personalized medicine by identifying potential biomarkers for ATR inhibitor resistance.
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Li S, Bo Z, Jiang Y, Song X, Wang C, Tong Y. Homoharringtonine promotes BCR‑ABL degradation through the p62‑mediated autophagy pathway. Oncol Rep 2019; 43:113-120. [PMID: 31789418 PMCID: PMC6908937 DOI: 10.3892/or.2019.7412] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 10/11/2019] [Indexed: 01/05/2023] Open
Abstract
Drug resistance to tyrosine kinase inhibitors (TKIs) is currently a clinical problem in patients with chronic myelogenous leukemia (CML). Homoharringtonine (HHT) is an approved treatment for adult patients with chronic- or accelerated-phase CML who are resistant to TKIs and other therapies; however, the underlying mechanisms remain unclear. In the present study, HHT treatment demonstrated induction of apoptosis in imatinib-resistant K562G cells by using MTS assay and western blotting, and BCR-ABL protein was reduced. CHX chase assay revealed that HHT induced degradation of the BCR-ABL protein, which could be reversed by autophagy lysosome inhibitors Baf-A1 and CQ. Next, HHT treatment confirmed the induction of autophagy in K562G cells, and silencing the key autophagic proteins ATG5 and Beclin-1 inhibited the degradation of the BCR-ABL protein and cytotoxicity. In addition, autophagic receptor p62/SQSTM1(p62) participated during the autophagic degradation of BCR-ABL induced by HHT, and this was confirmed by co-immunoprecipitation, in which HHT enhanced the ubiquitination of the BCR-ABL protein and promoted its binding to p62. In conclusion, HHT induced p62-mediated autophagy in imatinib-resistant CML K562G cells, thus promoting autophagic degradation of the BCR-ABL protein and providing a novel strategy for the treatment of TKI-resistant CML.
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Affiliation(s)
- Su Li
- Department of Hematology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Zhilei Bo
- Department of Hematology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Ying Jiang
- Department of Hematology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Xianmin Song
- Department of Hematology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Chun Wang
- Department of Hematology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Yin Tong
- Department of Hematology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
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Fakhri S, Abbaszadeh F, Jorjani M, Pourgholami MH. The effects of anticancer medicinal herbs on vascular endothelial growth factor based on pharmacological aspects: a review study. Nutr Cancer 2019; 73:1-15. [DOI: 10.1080/01635581.2019.1673451] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Sajad Fakhri
- Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Fatemeh Abbaszadeh
- Department of Neuroscience, Faculty of Advanced Technologies in Medical Sciences, Iran University of Medical Sciences, Tehran, Iran
- Neurobiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Masoumeh Jorjani
- Neurobiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Pharmacology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Chen MX, Wijethunge BDIK, Zhou SM, Yang JF, Dai L, Wang SS, Chen C, Fu LJ, Zhang J, Hao GF, Yang GF. Chemical Modulation of Alternative Splicing for Molecular-Target Identification by Potential Genetic Control in Agrochemical Research. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:5072-5084. [PMID: 30986354 DOI: 10.1021/acs.jafc.9b02086] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Alternative splicing (AS), the process of removing introns from pre-mRNA and the rearrangement of exons to produce several types of mature transcripts, is a remarkable step preceding protein synthesis. In particular, it has now been conclusively shown that up to ∼95% of genes are alternatively spliced to generate a complex and diverse proteome in eukaryotic organisms. Consequently, AS is one of the determinants of the functional repertoire of cells. Many studies have revealed that AS in plants can be regulated by cell type, developmental stage, environmental stress, and the circadian clock. Moreover, increasing amounts of evidence reveal that chemical compounds can affect various steps during splicing to induce major effects on plant physiology. Hence, the chemical modulation of AS can serve as a good strategy for molecular-target identification in attempts to potentially control plant genetics. However, the kind of mechanisms involved in the chemical modulation of AS that can be used in agrochemical research remain largely unknown. This review introduces recent studies describing the specific roles AS plays in plant adaptation to environmental stressors and in the regulation of development. We also discuss recent advances in small molecules that induce alterations of AS and the possibility of using this strategy in agrochemical-target identification, giving a new direction for potential genetic control in agrochemical research.
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Affiliation(s)
- Mo-Xian Chen
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering; Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education; Research and Development Center for Fine Chemicals , Guizhou University , Guiyang 550025 , PR China
- Division of Gastroenterology , Shenzhen Children's Hospital , Shenzhen 518038 , PR China
- Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology , Chinese Academy of Sciences , Shenzhen 518055 , PR China
- School of Life Sciences and Shenzhen Research Institute , The Chinese University of Hong Kong , Shenzhen 518063 , PR China
| | - Boyagane D I K Wijethunge
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China
| | - Shao-Ming Zhou
- Division of Gastroenterology , Shenzhen Children's Hospital , Shenzhen 518038 , PR China
| | - Jing-Fang Yang
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China
| | - Lei Dai
- Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology , Chinese Academy of Sciences , Shenzhen 518055 , PR China
| | - Shan-Shan Wang
- School of Life Sciences and Shenzhen Research Institute , The Chinese University of Hong Kong , Shenzhen 518063 , PR China
| | - Chen Chen
- Department of Infectious Disease, Nanjing Second Hospital , Nanjing University of Chinese Medicine , Nanjing 210003 , PR China
| | - Li-Jun Fu
- Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants , Putian University , Putian , Fujian 351100 , PR China
| | - Jianhua Zhang
- Department of Biology, Hong Kong Baptist University and State Key Laboratory of Agrobiotechnology , The Chinese University of Hong Kong , Shatin , Hong Kong , PR China
| | - Ge-Fei Hao
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering; Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education; Research and Development Center for Fine Chemicals , Guizhou University , Guiyang 550025 , PR China
| | - Guang-Fu Yang
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , PR China
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Jiao W, Han Q, Xu Y, Jiang H, Xing H, Teng X. Impaired immune function and structural integrity in the gills of common carp (Cyprinus carpio L.) caused by chlorpyrifos exposure: Through oxidative stress and apoptosis. FISH & SHELLFISH IMMUNOLOGY 2019; 86:239-245. [PMID: 30176333 DOI: 10.1016/j.fsi.2018.08.060] [Citation(s) in RCA: 99] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 08/24/2018] [Accepted: 08/30/2018] [Indexed: 06/08/2023]
Abstract
As one of the mucosal lymphatic tissues, the gill is an important immune organ in fish. Water environmental pollutants enter fish body through the gill. Therefore, the gill is the initial site where pollutants produce toxic effects in water. Chlorpyrifos (CPF), a broad-spectrum organophosphate insecticide, is widely used for agricultural pests and causes river pollution. In the present study, we investigated histopathological effect, oxidative stress indexes (SOD, GSH, T-AOC, and MDA), and apoptosis-related genes (P53, PUMA, Bax, Bcl-2, Apaf-1, Caspase-9, and Caspase-3) in the gills of common carp exposed to CPF. The results indicated that CPF exposure decreased SOD, T-AOC, and GSH; increased MDA; decreased Bcl-2 mRNA expression; and increased P53, PUMA, Bax, Apaf-1, Caspase-9, and Caspase-3 mRNA expressions in common carp gills. Our results proved that CPF exposure caused oxidative stress and apoptosis in common carp gills; CPF exposure destroyed the structural integrity and affected the immune function through oxidative stress and apoptosis in common carp gills. These will provide evidence for the toxic effects of water environmental pollutants on immune function and structural integrity in fish gills.
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Affiliation(s)
- Wanying Jiao
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, 150030, PR China
| | - Qi Han
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, 150030, PR China
| | - Yanmin Xu
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, 150030, PR China
| | - Huijie Jiang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, 150030, PR China
| | - Houjuan Xing
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, 150030, PR China.
| | - Xiaohua Teng
- College of Animal Science and Technology, Northeast Agricultural University, Harbin, 150030, PR China.
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