151
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Zhou Y, Xu X, Sun Y, Wang H, Sun H, You Q. Synthesis, cytotoxicity and topoisomerase II inhibitory activity of lomefloxacin derivatives. Bioorg Med Chem Lett 2013; 23:2974-8. [DOI: 10.1016/j.bmcl.2013.03.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 03/07/2013] [Accepted: 03/11/2013] [Indexed: 11/26/2022]
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152
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Duan L, You Q, Chen X, Wang H, Zhang H, Xie D, Xu X, Jiang G. Outcome and prognosis for patients younger than thirty with primary lung cancer. MINERVA CHIR 2013; 68:175-182. [PMID: 23612231] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
AIM Aim of the present study was to investigate the clinical and pathological features of surgical treatment for primary bronchogenic carcinoma in adolescent patients. PATIENTS We retrospectively reviewed the clinico-pathological records documenting surgical outcomes and prognostic factors in 68 lung cancer patients aged less than 30 years old enrolled in our hospital between March 1980 and December 2009. RESULTS Sixty-eight patients were identified (38 male, 30 female) with a mean age of 22±5 years (range 8 to 29 years). Preoperative clinical manifestations were present in 82.4% (56/68) of the patients and 26.5% (16/68) of patients were initially misdiagnosed. Fifty-two patients had undergone radical surgery, 4 palliative surgery, 9 had exploratory thoracotomies, and 3 had thoracoscopic lung biopsies. Eight patients were classified (TNM) stage Ia, 7 stage Ib, 9 stage IIa, 13 stage IIb, 17 stage IIIa, 10 stage IIIb, and 4 stage IV. Postoperative atelectasis was observed in 4.41% (3/68) of the patients, and 1.47% (1/68) died of respiratory failure 5 days after exploratory thoracotomy. The overall 5-year survival rate in very young people was 31%, while those who underwent radical surgery was slightly higher at 36.7%. Five-year survival rates were correlated with the surgical procedures and pTNM stage (P <0.05). Multivariate analysis indicated that the TNM stage is the only independent prognostic factor (P=0.000). CONCLUSION We conclude that radical surgeries, the predominant comprehensive therapies are the best choice for primary lung cancer patients younger than 30 years of age.
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Affiliation(s)
- L Duan
- Department of Thoracic Surgery, Tongji University School of Medicine Shanghai, China.
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153
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Jin Q, Xin M, Cong X, You Q. Design, Synthesis and Activity of Benzofuran-7-carboxamide Poly(ADP-ribose)-polymerase Inhibitors. CHINESE J ORG CHEM 2013. [DOI: 10.6023/cjoc201211019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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154
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Stryker JA, Fisher R, You Q, Or-Rashid MM, Boermans HJ, Quinton M, McBride BW, Karrow NA. Effects of dietary fish meal and soybean meal on the ovine innate and acquired immune response during pregnancy and lactation. Animal 2013; 7:151-9. [PMID: 23031339 DOI: 10.1017/s175173111200136x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
In recent years, livestock producers have been supplementing animal diets with fish meal (FM) to produce value-added products for health conscious consumers. As components of FM have unique neuroendocrine-immunomodulatory properties, we hypothesize that livestock producers may be influencing the overall health of their animals by supplementing diets with FM. In this study, 40 pregnant ewes were supplemented with rumen protected (RP) soybean meal (SBM: control diet) or RP FM, commencing gestation day 100 (gd100), in order to evaluate the impact of FM supplementation on the innate and acquired immune response and neuroendocrine response of sheep during pregnancy and lactation. On gd135, half the ewes from each diet (n = 10 FM, n = 10 SBM) were challenged iv with lipopolysaccharide (LPS) to simulate a systemic bacterial infection and the febrile, respiratory and neuroendocrine responses were monitored over time; the other half (n = 10 FM, n = 10 SBM) of the ewes received a saline injection as control. On lactation day 20 (ld20), all ewes (n = 20 FM, n = 20 SBM) were sensitized with hen egg white lysozyme (HEWL) and the serum haptoglobin (Hp) response was measured over time. The cutaneous hypersensitivity response (CHR) to HEWL challenge was measured on ld30 (n = 20 FM, n = 20 SBM), and blood samples were collected over time to measure the primary and secondary immunoglobulin G (IgG) response to HEWL. There was an attenuated trend in the LPS-induced febrile response by the FM treatment when compared with the SBM treatment (P = 0.06), as was also true for the respiratory response (P = 0.07), but significant differences in neuroendocrine function (serum cortisol and plasma ACTH) were not observed between treatments. Basal Hp levels were significantly lower in the FM supplemented ewes when compared with the SBM supplemented ewes (P < 0.01), and the Hp response to HEWL sensitization differed significantly over time between treatments (P < 0.01). The CHR to HEWL was also significantly attenuated in the FM treatment compared with the SBM (P < 0.01); however, treatment differences in the primary and secondary IgG responses to HEWL were not observed. These results indicate that FM supplementation differentially affects the innate and acquired immune responses in pregnant and lactating sheep compared with a typical SBM diet of commercial flocks. The long-term implications of this immunomodulation warrant further investigation.
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Affiliation(s)
- J A Stryker
- Department of Animal and Poultry Science, University of Guelph, Ontario, Canada
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155
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Affiliation(s)
- Minhang Xin
- Department of Medicinal Chemistry, School of Pharmacy; China Pharmaceutical University; 24 Tongjiaxiang; Nanjing; 210009; People's Republic of China
| | - Ying Gao
- Department of Medicinal Chemistry, School of Pharmacy; China Pharmaceutical University; 24 Tongjiaxiang; Nanjing; 210009; People's Republic of China
| | - Hua Xiang
- Department of Medicinal Chemistry, School of Pharmacy; China Pharmaceutical University; 24 Tongjiaxiang; Nanjing; 210009; People's Republic of China
| | - Dong Chen
- Department of Medicinal Chemistry, School of Pharmacy; China Pharmaceutical University; 24 Tongjiaxiang; Nanjing; 210009; People's Republic of China
| | - Yi He
- Department of Medicinal Chemistry, School of Pharmacy; China Pharmaceutical University; 24 Tongjiaxiang; Nanjing; 210009; People's Republic of China
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156
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Zhang Q, Diao Y, Wang F, Fu Y, Tang F, You Q, Zhou H. Design and discovery of 4-anilinoquinazoline ureas as multikinase inhibitors targeting BRAF, VEGFR-2 and EGFR. Med Chem Commun 2013. [DOI: 10.1039/c3md00096f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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157
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Zhang X, Li X, Sun H, Wang X, Zhao L, Gao Y, Liu X, Zhang S, Wang Y, Yang Y, Zeng S, Guo Q, You Q. Garcinia xanthones as orally active antitumor agents. J Med Chem 2012; 56:276-92. [PMID: 23167526 DOI: 10.1021/jm301593r] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Using a newly developed strategy whose key step is the regioselective propargylation of hydroxyxanthone substrates, 99 structurally diverse Garcinia natural-product-like xanthones based on gambogic acid were designed and synthesized and their in vitro antitumor activity was evaluated. A set of 40 related compounds was chosen for determination of their physicochemical properties including polar surface area, log D₇.₄, aqueous solubility, and permeability at pH 7.4. In the light of the in vitro antitumor activity and the physicochemical properties, two compounds were advanced into in vivo efficacy experiments. The antitumor activity of compound 112, administered po, showed more potent in vivo oral antitumor activity than gambogic acid.
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Affiliation(s)
- Xiaojin Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China
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158
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Zhang X, Li X, Ye S, Zhang Y, Tao L, Gao Y, Gong D, Xi M, Meng H, Zhang M, Gao W, Xu X, Guo Q, You Q. Synthesis, SAR and Biological Evaluation of Natural and Non-natural Hydroxylated and Prenylated Xanthones as Antitumor Agents. Med Chem 2012. [DOI: 10.2174/157340612804075106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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159
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Li C, Qi Q, Lu N, Dai Q, Li F, Wang X, You Q, Guo Q. Gambogic acid promotes apoptosis and resistance to metastatic potential in MDA-MB-231 human breast carcinoma cells. Biochem Cell Biol 2012. [PMID: 23194187 DOI: 10.1139/o2012-030] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Gambogic acid (GA) is considered a potent anti-tumor agent for its multiple effects on cancer cells in vitro and in vivo. Low concentrations of GA (0.3-1.2 µmol/L) can suppress invasion of human breast carcinoma cells without affecting cell viability. To get a whole profile of the inhibition on breast cancers, higher concentrations of GA and spontaneous metastatic animal models were employed. Treatment with GA (3 and 6 µmol/L) induced apoptosis in MDA-MB-231 cells and the accumulation of reactive oxygen species (ROS). Furthermore, GA induced PARP cleavage, activation of caspase-3, caspase-8, and caspase-9, as well as an increased ratio of Bax/Bcl-2. Moreover, the translocation of apoptotic inducing factor (AIF) and the release of cytochrome c (Cyt c) from mitochondria were observed, indicating that GA induced apoptosis through accumulation of ROS and mitochondrial apoptotic pathway. GA also inhibited cell survival via blocking Akt/mTOR signaling. In vivo, GA significantly inhibited the xenograft tumor growth and lung metastases in athymic BALB/c nude mice bearing MDA-MB-231 cells. Collectively, these data provide further support for the multiple effects of GA on human breast cancer cells, as well as for its potential application to inhibit tumor growth and prevent metastasis in human cancers.
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Affiliation(s)
- Chenglin Li
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, PR China
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160
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Huang K, Wu X, Jiang Z, Sun H, You Q. Cover Picture: Novel Dual-Site-Binding Neuraminidase Inhibitor from Virtual Screening by Pharmacophore and Molecular Dynamics Methods (Chin. J. Chem. 8/2012). CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201290020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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161
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Zhang X, Li X, Ye S, Zhang Y, Tao L, Gao Y, Gong D, Xi M, Meng H, Zhang M, Gao W, Xu X, Guo Q, You Q. Synthesis, SAR and biological evaluation of natural and non-natural hydroxylated and prenylated xanthones as antitumor agents. Med Chem 2012; 8:1012-25. [PMID: 22779801 DOI: 10.2174/1573406411208061012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 05/14/2012] [Accepted: 05/18/2012] [Indexed: 11/22/2022]
Abstract
In order to explore the detailed structure-activity relationship (SAR) around xanthone scaffold bearing hydroxyl and prenyl moieties, twenty-nine natural and non-natural hydroxylated and prenylated xanthones have been synthesized and evaluated for their in vitro anti-proliferative activities against five human cancer cell lines, including HepG2 (hepatocelluar carcinoma), HCT-116 (colon carcinoma), A549 (lung carcinoma), BGC823 (gastric carcinoma) and MDAMB- 231 (breast carcinoma). The SAR analysis revealed that the anti-proliferative activity of the xanthones is substantially influenced by the position and number of attached hydroxyl and prenyl groups, and the presence of hydroxyl group ortho to the carbonyl function of xanthone scaffold contributes significantly to their cytotoxicity. The new prenylated xanthone 20 with a relatively simple structure, namely 1,3,8-trihydroxy-2-prenylxanthone, was found to exhibit potent antitumor activities comparable to α-mangostin against all the five cancer cell lines. Further mechanistic studies suggested that compound 20 induces apoptosis and causes cell cycle arrest at S phase in HepG2 cells. These results have highlighted compound 20 as a new potential lead candidate for future development of novel potent broad-spectrum antitumor agents.
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Affiliation(s)
- Xiaojin Zhang
- State Key Laboratory of Natural Medicines (China Pharmaceutical University), Nanjing 210009, China
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162
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Huang K, Wu X, Jiang Z, Sun H, You Q. Novel Dual-Site-Binding Neuraminidase Inhibitor from Virtual Screening by Pharmacophore and Molecular Dynamics Methods. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201200313] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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163
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Yang J, Li C, Ding L, Guo Q, You Q, Jin S. Gambogic acid deactivates cytosolic and mitochondrial thioredoxins by covalent binding to the functional domain. J Nat Prod 2012; 75:1108-1116. [PMID: 22663155 DOI: 10.1021/np300118c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Gambogic acid (1) is a cytotoxic caged xanthone derived from the resin of Garcinia hanburyi. Compound 1 selectively induces apoptosis in cancer cells, at least partially, by targeting the stress response to reactive oxygen species (ROS). However, the molecular mechanism of ROS toxicity stimulated by 1 remains poorly understood. In this study, mass spectrometric and biochemical pharmacological approaches were used that resulted in the identification of both cytosolic thioredoxin (TRX-1) and mitochondrial thioredoxin (TRX-2) as the molecular targets of 1. The results obtained showed that 1 deactivates TRX-1/2 proteins by covalent binding to the active cysteine residues in the functional domain via Michael addition reactions. Since both TRX-1 and TRX-2 play key roles in regulating the redox signaling of cancer cells, the present findings may shed light on the relationship between protein binding and cellular ROS accumulation induced by 1. This provides support for the current clinical trials of gambogic acid (1) being conducted alone or in combination with other agents that appear to increase ROS generation in order to selectively kill cancer cells.
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Affiliation(s)
- Jing Yang
- Department of Pharmaceutical Analysis, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, People's Republic of China
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164
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Xu M, Lu N, Sun Z, Zhang H, Dai Q, Wei L, Li Z, You Q, Guo Q. Activation of the unfolded protein response contributed to the selective cytotoxicity of oroxylin A in human hepatocellular carcinoma HepG2 cells. Toxicol Lett 2012; 212:113-25. [PMID: 22609744 DOI: 10.1016/j.toxlet.2012.05.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 05/05/2012] [Accepted: 05/08/2012] [Indexed: 12/24/2022]
Abstract
Hepatocellular carcinoma (HCC) is a refractory malignancy with a high incidence and large mortality. Current strategy for the chemotherapy of HCC focuses on developing agents with better efficacy and lower toxicity. In this study, we demonstrated that the natural flavonoid oroxylin A preferentially inhibited the viability of HCC cell line HepG2 but not the normal hepatic cell line L02. In HepG2 but not L02 cells, oroxylin A induced substantial production of intracellular H₂O₂ and inordinate activation of the PERK-eIF2α-ATF4-CHOP branch of the unfolded protein response (UPR) pathway, which resulted in the induction of TRB3 and causal reduction of p-AKT1/2/3 (Ser473). Moreover, these effects were eliminated by either the stable knockdown of CHOP or the pretreatment and then co-incubation with the specific H₂O₂ scavenger catalase. These results indicated that the H₂O₂-triggered overactivation of the UPR pathway and causal inactivation of AKT signaling contributed to the preferential cytotoxicity of oroxylin A in malignant HepG2 cells. Therefore, present study proposed an underlying molecular mechanism that implicated the selective antitumor effect of oroxylin A and recommended oroxylin A as a prospect for improving the current chemotherapeutic strategy for the treatment of HCC.
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Affiliation(s)
- Min Xu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, PR China
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165
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Li X, Zhang X, Sun H, Zhang L, Gao Y, Wang J, Guo Q, You Q. Synthesis and Anti-tumor Evaluation of Novel C-37 Modified Derivatives of Gambogic Acid. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201100693] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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166
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Zou M, Lu N, Hu C, Liu W, Sun Y, Wang X, You Q, Gu C, Xi T, Guo Q. Beclin 1-mediated autophagy in hepatocellular carcinoma cells: implication in anticancer efficiency of oroxylin A via inhibition of mTOR signaling. Cell Signal 2012; 24:1722-32. [PMID: 22560876 DOI: 10.1016/j.cellsig.2012.04.009] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Accepted: 04/17/2012] [Indexed: 12/12/2022]
Abstract
Autophagy is a tightly-regulated catabolic process that involves the degradation of intracellular components via lysosomes. Although the pivotal role of autophagy in cell growth, development, and homeostasis has been well understood, its function in cancer prevention and intervention remains to be delineated. The aim of this study was to investigate the function and mechanism of autophagy induced by oroxylin A, a natural mono-flavonoid extracted from Scutellariae radix. We found for the first time that oroxylin A induced Beclin 1-mediated autophagy in human hepatocellular carcinoma HepG2 cells. Time-lapse video microscopy and western blotting studies showed that treatment of cells with 80 μM oroxylin A resulted in the conversion of water soluble MAP-LC3 (LC3-I) to the lipidated and autophagosome-associated form (LC3-II) after 12hours; then autophagosome-lysosome fusion and lysosome degradation after 24 hours was required in oroxylin A-mediated cell death. This induction was associated with the suppressing of PI3K-PTEN-Akt-mTOR signaling pathway by oroxylin A. Our results also showed that autophagy took place before noticeable apoptosis can be observed. It was further demonstrated that oroxylin A-triggered autophagy contributed to cell death using over-expression of autophagy-related gene (Atg5 and Atg7) and inhibition of autophagy by siBeclin 1 and 3-methyladenine (3-MA). In vivo study, oroxylin A inhibited xenograft tumor growth and induced obvious autophagy in tumors. Taken together, we conclude that oroxylin A exhibits autophagy-mediated antitumor activity in a dose and time-dependent manner in vivo and in vitro. These findings define and support a novel function of autophagy in promoting death of hepatocellular carcinoma cells.
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Affiliation(s)
- Meijuan Zou
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention (China Pharmaceutical University), Nanjing, People's Republic of China
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167
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Lin K, Len Y, Feng J, Gao H, You Q, Lin D, Liu J. Structure of a novel PTH-related peptide hPTH′ and its interaction with the PTH receptor. J Pept Sci 2012; 18:413-7. [DOI: 10.1002/psc.2412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 02/18/2012] [Accepted: 03/08/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Kejiang Lin
- Department of Medicinal Chemistry; China Pharmaceutical University; Nanjing; 210009; China
| | - Yonggan Len
- Department of Medicinal Chemistry; China Pharmaceutical University; Nanjing; 210009; China
| | - Jao Feng
- School of Life Science and Technology; China Pharmaceutical University; Nanjing; 210009; China
| | - Hongchang Gao
- School of Pharmacy; Wenzhou Medical College; Wenzhou; 325035; China
| | - Qidong You
- Department of Medicinal Chemistry; China Pharmaceutical University; Nanjing; 210009; China
| | - Donghai Lin
- The Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering; Xiamen University; Xiamen; 361005; China
| | - Jingjing Liu
- School of Life Science and Technology; China Pharmaceutical University; Nanjing; 210009; China
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168
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Sun H, Chen F, Wang X, Liu Z, Yang Q, Zhang X, Zhu J, Qiang L, Guo Q, You Q. Studies on gambogic acid (IV): Exploring structure-activity relationship with IκB kinase-beta (IKKβ). Eur J Med Chem 2012; 51:110-23. [PMID: 22472167 DOI: 10.1016/j.ejmech.2012.02.029] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 02/14/2012] [Accepted: 02/14/2012] [Indexed: 01/04/2023]
Abstract
Previously we have reported a series of gambogic acid's analogs and have identified a compound that possessed comparable in vitro growth inhibitory effect as gambogic acid. However, their target protein as well as the key pharmacophoric motifs on the target have not been identified yet. Herein we report that gambogic acid and its analogs inhibit the activity of IκB Kinase-beta (IKKβ) through suppressing the activation of TNFα/NF-κB pathway, which in turn induces A549 and U251 cell apoptosis. IKKβ can serve as one of gambogic acid's targets. The preparation of the compounds was carefully discussed in the article. Caged 4-oxa-tricyclo[4.3.1.0(3,7)]dec-2-one xanthone, which was identified as the pharmacophoric scaffold, represents a promising therapeutic agent for cancer and useful probe against NF-κB pathway.
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Affiliation(s)
- Haopeng Sun
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, China
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169
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Zhu B, Zhao L, Zhu L, Wang H, Sha Y, Yao J, Li Z, You Q, Guo Q. Oroxylin A reverses CAM-DR of HepG2 cells by suppressing Integrinβ1 and its related pathway. Toxicol Appl Pharmacol 2012; 259:387-94. [DOI: 10.1016/j.taap.2012.01.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 12/31/2011] [Accepted: 01/17/2012] [Indexed: 12/26/2022]
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170
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Abstract
Pulmonary pseudoangiosarcomatous squamous cell carcinoma (PSCC) is a rare aggressive variant of squamous cell carcinoma. Histopathologically, PSCC is characterized by interanastomosing cords and channels, lined by atypical cells, with spaces containing erythrocytes or floating tumour cells. PSCC mimics angiosarcoma, so careful attention should be paid to immunohistochemical differences. Two PSCC cases are described here: in a 79-year-old male, bronchoscopy revealed mucosal swelling and hypertrophy and an adrenal mass was found 1 month later; in a 76-year-old male, computed tomography revealed rib destruction due to a non-calcified soft-tissue tumour and, although the tumour resembled an angiosarcoma, endothelial markers were negative and cytokeratin and p63 markers were positive. Immunohistochemical analyses may be helpful in establishing an accurate diagnosis. PSCC had a progressive course in both patients, who died ≤ 3 months postdiagnosis.
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Affiliation(s)
- M Kong
- Department of Pathology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
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171
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Yang J, Ding L, Hu L, Jin S, Liu W, You Q, Guo Q. Rapid characterization of caged xanthones in the resin of Garcinia hanburyi using multiple mass spectrometric scanning modes: The importance of biosynthetic knowledge based prediction. J Pharm Biomed Anal 2012; 60:71-9. [DOI: 10.1016/j.jpba.2011.10.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2011] [Revised: 10/28/2011] [Accepted: 10/29/2011] [Indexed: 10/15/2022]
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172
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173
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Zhang X, Li X, Sun H, Jiang Z, Tao L, Gao Y, Guo Q, You Q. Synthesis and evaluation of novel aza-caged Garcinia xanthones. Org Biomol Chem 2012; 10:3288-99. [DOI: 10.1039/c2ob07088j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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174
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175
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Li X, Zhang X, Wang X, Li N, Lin C, Gao Y, Yu Z, Guo Q, You Q. Synthesis and Anti-tumor Evaluation of B-ring Modified Caged Xanthone Analogues of Gambogic Acid. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201100045] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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176
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You Q, Jiang C, Wu Y, Yu X, Chen Y, Zhang X, Wei W, Wang Y, Tang Z, Jiang D, Wu Y, Wang C, Meng X, Zhao X, Kong W. Subcutaneous Administration of Modified Vaccinia Virus Ankara Expressing an Ag85B-ESAT6 Fusion Protein, but Not an Adenovirus-Based Vaccine, Protects Mice Against Intravenous Challenge with Mycobacterium tuberculosis. Scand J Immunol 2011; 75:77-84. [DOI: 10.1111/j.1365-3083.2011.02629.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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177
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Li X, Zhang X, Yu Z, Liu X, You Q, Guo Q. Microwave-Assisted Claisen Rearrangement/Diels–Alder Cascade reaction for the Synthesis of Caged Garcinia Natural Products and Analogues. Journal of Chemical Research 2011. [DOI: 10.3184/174751911x13191290708355] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A microwave-assisted Claisen rearrangement/Diels–Alder cascade reaction was used to synthesise caged Garcinia natural products and analogues containing the unique 4-oxa-tricyclo[4.3.1.03,7]decan-2-one scaffold from xanthone-based and chromone-based substrates. Forbesione and cluvenone as well as two new and six known caged analogues were obtained. Compared with the traditional thermal method, the reaction time was reduced dramatically and the yield was greatly improved under microwave irradiation. In addition, the regioselectivity observed in the cascade reaction has also been rationalised. Garcinia have long been used in folk medicines for their healing, antibacterial, and cytotoxic activities.
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Affiliation(s)
- Xiang Li
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Xiaojin Zhang
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Zhuoqin Yu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Xiaorong Liu
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Qidong You
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
| | - Qinglong Guo
- State Key Laboratory of Natural Medicines, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing 210009, P. R. China
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178
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Zhang X, Wang R, Zhao L, Lu N, Wang J, You Q, Li Z, Guo Q. Synthesis and biological evaluations of novel indenoisoquinolines as topoisomerase I inhibitors. Bioorg Med Chem Lett 2011; 22:1276-81. [PMID: 22079759 DOI: 10.1016/j.bmcl.2011.10.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2011] [Revised: 10/04/2011] [Accepted: 10/07/2011] [Indexed: 01/02/2023]
Abstract
A series of novel indenoisoquinoline derivatives were synthesized. The anticancer activities of these molecules were tested in human cancer cell lines A549, HepG2, and HCT-116. These compounds were also tested for their activity of topoisomerase I (top1) inhibition. Among them, compound 25 was found to be 10-times more potent in cell-killing activity for both cell lines HepG2 and HCT-116 than reported compound 11, with IC(50) of 0.019 and 0.093μM, respectively. Compound 25 was also found to have stronger top1 inhibition activity than 11 in our inhibition assay. Further in vivo evaluations of compound 25 are in progress and will be reported in due course.
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Affiliation(s)
- Xiaoyun Zhang
- Department of Medicinal Chemistry, Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, People's Republic of China
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179
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Verschoor CP, Pant SD, You Q, Schenkel FS, Kelton DF, Karrow NA. Single nucleotide polymorphisms alter the promoter activity of bovine MIF. Anim Biotechnol 2011; 22:143-50. [PMID: 21774622 DOI: 10.1080/10495398.2011.580219] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Macrophage migration inhibitory factor (MIF) is a unique pro-inflammatory cytokine whose chief functions include modulating TLR4 expression, and suppressing the anti-inflammatory effects of glucocorticoids. Not surprisingly, MIF is involved in a number of inflammatory diseases and single nucleotide polymorphisms (SNPs) have been implicated in modulating disease severity. The objective of the present study was to determine if SNPs in 5' region of bovine MIF affects its promoter activity. Three SNPs were identified, -1078A>G, -395A>G, and -400G>C, all of which fall within predicted transcription factor binding regions. Reporter gene assays indicate that the identified SNPs have a significant effect of modulating MIF promoter activity. Finally, gene association analysis suggests a significant relationship of -395A>G with the susceptibility to Mycobacterium avium ssp. paratuberculosis infection, the causative agent of Johne's disease. Given the relationships revealed in the current study, it is clear that the role of MIF in bovine diseases such as Johne's disease merits further investigation.
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Affiliation(s)
- C P Verschoor
- Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada
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180
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Li C, Lu N, Qi Q, Li F, Ling Y, Chen Y, Qin Y, Li Z, Zhang H, You Q, Guo Q. Gambogic acid inhibits tumor cell adhesion by suppressing integrin β1 and membrane lipid rafts-associated integrin signaling pathway. Biochem Pharmacol 2011; 82:1873-83. [PMID: 21946083 DOI: 10.1016/j.bcp.2011.09.013] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Revised: 09/12/2011] [Accepted: 09/12/2011] [Indexed: 12/12/2022]
Abstract
Cell adhesion plays an important role in the steps of cancer metastasis. Regulation of cell-cell (intercellular) and cell-matrix adhesion is a promising strategy for cancer progression. Gambogic acid is a xanthone derived from the resin of the Chinese plant Garciania hanburyi, with potent anti-metastasis activity on highly metastatic cells. The aim of this study was to investigate the function and mechanism of gambogic acid on tumor adhesion. We found that gambogic acid strongly inhibited the adhesion of human cancer cells to fibronectin. This inhibition was associated with the deformation of focal adhesion complex, which was mediated by suppressing the expression of integrin β1 and integrin signaling pathway. In vitro, cell lipid rafts clustering was inhibited following treatment of gambogic acid, which induced the suppression of integrin β1 and focal adhesion complex proteins colocalization within rafts. Moreover, gambogic acid significantly decreased cellular cholesterol content, whereas cholesterol replenishment lessened the inhibitory effect of gambogic acid on cell adhesion. Real-time PCR analysis showed that gambogic acid reduced mRNA levels of hydroxymethylglutaryl-CoA reductase and sterol regulatory element binding protein-2, while increased acetyl-CoA acetyltransferase-1/2. Taken together, these results demonstrate that gambogic acid inhibits cell adhesion via suppressing integrin β1 abundance and cholesterol content as well as the membrane lipid raft-associated integrin function, which provide new evidence for the anti-cancer activity of gambogic acid.
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Affiliation(s)
- Chenglin Li
- Jiangsu Key Laboratory of Carcinogenesis and Intervention (China Pharmaceutical University), Tongjiaxiang 24, Nanjing 210009, People's Republic of China.
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181
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Lu X, Wan B, Franzblau SG, You Q. Design, synthesis and anti-tubercular evaluation of new 2-acylated and 2-alkylated amino-5-(4-(benzyloxy)phenyl)thiophene-3-carboxylic acid derivatives. Part 1. Eur J Med Chem 2011; 46:3551-63. [DOI: 10.1016/j.ejmech.2011.05.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 05/03/2011] [Accepted: 05/09/2011] [Indexed: 10/18/2022]
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182
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Tan Y, Chen Y, You Q, Sun H, Li M. Predicting the potency of hERG K+ channel inhibition by combining 3D-QSAR pharmacophore and 2D-QSAR models. J Mol Model 2011; 18:1023-36. [DOI: 10.1007/s00894-011-1136-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2011] [Accepted: 05/23/2011] [Indexed: 02/06/2023]
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183
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Abstract
INTRODUCTION Bacterial enoyl acyl carrier protein reductase (ENR) specificity reduces the double bond in enoyl thioester substrates in the final enzymatic step of the elongation cycle of the fatty acid synthase-II pathway. Its function is essential for bacterial organism survival, making it an attractive target for the development of novel antibiotics. The structural features and therapeutic potential of this enzyme have stimulated the rational design of ENR inhibitors, and important progress has been achieved to date. AREAS COVERED This review describes recent advances made in the search for ENR inhibitors, as reflected by patent applications filed from 2006 to 2010, together with an overview of the relevant literature. The first section of this paper provides a background of the biology of ENR, followed by a description of its structure and function. The main section describes the substrate specificities for ENR, and the structure-based rational design of patent inhibitors originating from different companies and academic groups. EXPERT OPINION The increase in the number of ENR inhibitors bodes well for the development of new therapeutics against multidrug-resistant bacteria. The challenge is now to improve the pharmacokinetic parameters of these inhibitors and translate them into clinical studies.
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Affiliation(s)
- Xiaoyun Lu
- Guangzhou Institutes of Biomedicine and Health, Key Laboratory of Regenerative Biology and Institute of Chemical Biology, Chinese Academy of Sciences, No. 190, Kaiyuan Avenue, Science Park, Guangzhou, 510530, China
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184
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Xu D, Sun H, Chen Y, Sun L, You Q. Pharmacophore Modeling and in Silico Screening Studies to Design Potential KDR Kinase Inhibitors. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201190208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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185
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Liu W, Dai Q, Lu N, Wei L, Ha J, Rong J, Mu R, You Q, Li Z, Guo Q. LYG-202 inhibits the proliferation of human colorectal carcinoma HCT-116 cells through induction of G1/S cell cycle arrest and apoptosis via p53 and p21(WAF1/Cip1) expression. Biochem Cell Biol 2011; 89:287-98. [PMID: 21491996 DOI: 10.1139/o10-162] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We recently established that LYG-202, a new flavonoid with a piperazine substitution, exerts an anti-tumor effect in vivo and in vitro. In the present study, we demonstrate that LYG-202 induces G1/S phase arrest and apoptosis in human colorectal carcinoma HCT-116 cells. Data showed that the blockade of the cell cycle was associated with increased p21(WAF1/Cip1) and Rb levels and reduced expression of cyclin D1, cyclin E, and CDK4. Moreover, PARP cleavage, activation of caspase-3, caspase-8, and caspase-9, and an increased ratio of Bax/Bcl-2 were detected in LYG-202-induced apoptosis. Additionally, activation of p53 resulted in the up-regulation of its downstream targets PUMA and p21(WAF1/Cip1), as well as the down-regulation of its negative regulator MDM2, suggesting that the p53 pathway may play a crucial role in LYG-202-induced cell cycle arrest and apoptosis. Furthermore, siRNA knockdown of p53 attenuated the G1 cell cycle arrest and apoptosis induced by LYG-202, as the effects of LYG-202 on up-regulation of p21(WAF1/Cip1) and down-regulation of Bcl-2 and pro-caspase-3 were partly inhibited in p53 siRNA transfected cells compared with control siRNA transfected cells. Collectively, these data indicate that LYG-202 exerts its anti-tumor potency by activating the p53-p21 pathway for G1/S cell cycle arrest and apoptosis in colorectal cancer cells.
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Affiliation(s)
- Wei Liu
- Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Tongjiaxiang, Nanjing, the People's Republic of China
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186
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Pant SD, Verschoor CP, Schenkel FS, You Q, Kelton DF, Karrow NA. Bovine PGLYRP1 polymorphisms and their association with resistance to Mycobacterium avium ssp. paratuberculosis. Anim Genet 2011; 42:354-60. [PMID: 21749417 DOI: 10.1111/j.1365-2052.2010.02153.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Mycobacterium avium ssp. paratuberculosis (MAP) causes a chronic, granulomatous inflammatory condition of the intestines in ruminants and wild-type species. It causes significant economic losses to the dairy and beef industries owing to reduced productivity, premature culling and mortality. Bovine peptidoglycan recognition protein 1 is an important pattern recognition molecule that is capable of directly killing microorganisms. The goal of this study was to identify single nucleotide polymorphisms (SNPs) in the gene encoding bovine peptidoglycan recognition protein 1 and to assess their association with susceptibility to MAP infection in dairy cattle. Blood and milk samples were collected from Holsteins in Southwestern and Eastern Ontario and tested for MAP infection using blood and milk ELISAs. A resource population consisting of 197 infected (S/P > 0.25) and 242 healthy (S/P < 0.10) cattle was constructed. Sequencing of pooled DNA was used to identify three SNPs (c.102G>C, c.480G>A and c.625C>A) that were genotyped in the resource population. Statistical analysis was performed using a logistic regression model fitting the additive and dominance effects of each SNP in the model. SNP c.480G>A (P = 0.054) was found to be associated with susceptibility to MAP infection. Cows with a copy of the major allele 'G' at this locus had an odds ratio of 1.51 (95% CI: 0.99-2.31) for being infected with MAP.
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Affiliation(s)
- S D Pant
- Centre for Genetic Improvement of Livestock, Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada
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187
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Wang X, Lu N, Yang Q, Gong D, Lin C, Zhang S, Xi M, Gao Y, Wei L, Guo Q, You Q. Studies on chemical modification and biology of a natural product, gambogic acid (III): determination of the essential pharmacophore for biological activity. Eur J Med Chem 2011; 46:1280-90. [PMID: 21334116 DOI: 10.1016/j.ejmech.2011.01.051] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 01/21/2011] [Accepted: 01/25/2011] [Indexed: 02/07/2023]
Abstract
Caged 4-oxa-tricyclo[4.3.1.0(3,7)]dec-2-one structural motifs are found in Garcinia natural products that demonstrate anti-tumor activity. Gambogic acid (GA, 1), the most abundant caged Garcinia xanthones, has been reported to be a promising anti-cancer agent. To identify the essential pharmacophore for its anti-tumor activity, a series of GA analogues that address potential key structural features for biological activity were synthesized, among which compound 11a displayed comparable in vitro anti-tumor activity as GA. Mechanistic studies on 11a determined that the compound induces apoptosis as well as arrests the G2/M phase of the cell cycle in HepG2 cells. The determination of the essential part of the scaffold found in GA to maintain anti-tumor effects, and the SAR based on the caged pharmacophore are reported and will provide key information for future anti-cancer drug development studies.
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Affiliation(s)
- Xiaojian Wang
- Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
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188
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Abstract
The secreted glycoprotein YKL-40 is a member of the chitinase family and elevated serum YKL-40 levels have been reported to be associated with reduced survival in several malignancies, including endometrial cancer. This study investigated immunoreactivity to YKL-40 protein and its prognostic implications in endometrial cancer. Levels of YKL-40 protein in normal endometrium (n = 42), endometrial hyperplasia (n = 40) and endometrial adeno carcinoma (n = 68) were examined using immunohistochemistry. YKL-40 immunoreactivity was significantly higher in endometrial adenocarcinoma compared with hyperplastic and normal endo metrium. In addition, high immuno reactivity of YKL-40 protein was associated with advanced stage, high histological grade, lymph node metastasis and lympho vascular invasion. Moreover, positive immunoreactivity for YKL-40 was a significant predictor of poor prognosis, as measured by estimated progression-free survival and estimated overall survival, compared with negative immunoreactivity. In conclusion, high YKL-40 immuno reactivity in endometrial cancer may be associated with poor prognosis.
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Affiliation(s)
- C Peng
- Department of Obstetrics and Gynaecology, The First Affiliated Hospital, Harbin Medical University, Harbin, China
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189
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Wei L, Lu N, Dai Q, Rong J, Chen Y, Li Z, You Q, Guo Q. Different apoptotic effects of wogonin via induction of H2O2 generation and Ca2+ overload in malignant hepatoma and normal hepatic cells. J Cell Biochem 2010; 111:1629-41. [DOI: 10.1002/jcb.22898] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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190
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Yang Q, Fedida D, Xu H, Wang B, Du L, Wang X, Li M, You Q. Structure-based virtual screening and electrophysiological evaluation of new chemotypes of K(v)1.5 channel blockers. ChemMedChem 2010; 5:1353-8. [PMID: 20540065 DOI: 10.1002/cmdc.201000162] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Atrial fibrillation (AF) is the most prevalent nonfatal cardiac rhythm disorder associated with an increased risk of heart failure and stroke. Considering the ventricular side effects induced by anti-arrhythmic agents in current use, K(v)1.5 channel blockers have attracted a great deal of deliberation owing to their selective actions on atrial electrophysiology. Herein we report new chemotypes of K(v)1.5 channel blockers that were identified through a combination of structure-based virtual screening and in silico druglike property prediction including six scoring functions, as well as electrophysiological evaluation. Among them, five of the 18 compounds exhibited >50 % blockade ratio at 10 microM, and have structural features different from conventional K(v)1.5 channel blockers. These novel scaffolds could serve as hits for further optimization and SAR studies for the discovery of selective agents to treat AF.
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Affiliation(s)
- Qian Yang
- Department of Medicinal Chemistry, China Pharmaceutical University, Nanjing, Jiangsu, China
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191
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Wang J, Ma J, You Q, Zhao L, Wang F, Li C, Guo Q. Studies on chemical modification and biology of a natural product, gambogic acid (II): Synthesis and bioevaluation of gambogellic acid and its derivatives from gambogic acid as antitumor agents. Eur J Med Chem 2010; 45:4343-53. [DOI: 10.1016/j.ejmech.2010.04.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2009] [Revised: 04/29/2010] [Accepted: 04/30/2010] [Indexed: 11/26/2022]
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192
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Lu X, You Q. Recent Advances on Platensimycin: A Potential Antimicrobial Agent. Curr Med Chem 2010; 17:1139-55. [DOI: 10.2174/092986710790827852] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Accepted: 02/09/2010] [Indexed: 11/22/2022]
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193
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Zhang Z, Li Z, Tian J, Jiang W, Wang Y, Zhang X, Li Z, You Q, Shapiro JI, Si S, Xie Z. Identification of hydroxyxanthones as Na/K-ATPase ligands. Mol Pharmacol 2010; 77:961-7. [PMID: 20335388 DOI: 10.1124/mol.110.063974] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
We have screened a chemical library and identified several novel structures of Na/K-ATPase inhibitors. One group of these inhibitors belongs to polyphenolic xanthone derivatives. Functional characterization reveals the following properties of this group of inhibitors. First, like ouabain, they are potent inhibitors of the purified Na/K-ATPase. Second, their effects on the Na/K-ATPase depend on the number and position of phenolic groups. Methylation of these phenolic groups reduces the inhibitory effect. Third, further characterization of the most potent xanthone derivative, MB7 (3,4,5,6-tetrahydroxyxanthone), reveals that it does not change either Na(+) or ATP affinity of the enzyme. Finally, unlike that of ouabain, the inhibitory effect of MB7 on Na/K-ATPase is not antagonized by K(+). Moreover, MB7 does not activate the receptor Na/K-ATPase/Src complex and fails to stimulate protein kinase cascades in cultured cells. Thus, we have identified a group of novel Na/K-ATPase ligands that can inhibit the pumping function without stimulating the signaling function of Na/K-ATPase.
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Affiliation(s)
- Zhongbing Zhang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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194
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Wang X, Yang Q, Li M, Yin D, You Q. In silico binding characteristics between human histamine H1 receptor and antagonists. J Mol Model 2010; 16:1529-37. [DOI: 10.1007/s00894-010-0666-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 01/14/2010] [Indexed: 12/01/2022]
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195
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Chen Y, Lu N, Ling Y, Wang L, You Q, Li Z, Guo Q. LYG-202, a Newly Synthesized Flavonoid, Exhibits Potent Anti-angiogenic Activity In Vitro and In Vivo. J Pharmacol Sci 2010; 112:37-45. [DOI: 10.1254/jphs.09213fp] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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196
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Abstract
An efficient and practical scheme to synthesize 2-methoxyestradiol has been developed. The key step was the copper-mediated methoxylation using ethyl acetate as a co-catalyst to introduce a methoxyl group. These synthetic procedures of four steps from 17beta-estradiol as starting material gave 2-methoxyestradiol with a 61% overall yield.
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Affiliation(s)
- Minhang Xin
- Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, PR China
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197
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Mu R, Qi Q, Gu H, Wang J, Yang Y, Rong J, Liu W, Lu N, You Q, Guo Q. Involvement of p53 in oroxylin A-induced apoptosis in cancer cells. Mol Carcinog 2009; 48:1159-69. [PMID: 19626645 DOI: 10.1002/mc.20570] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Oroxylin A, a naturally occurring monoflavonoid extracted from Scutellariae radix, exhibits anticancer activity and induces apoptosis in human hepatocellular carcinoma HepG2 cells according to our previous data. In this study, we investigate whether p53 is involved in oroxylin A-triggered viability inhibition and apoptosis induction in cancer cells. In a panel of different cancer cell lines, more potent inhibitory effects of oroxylin A were observed in wtp53 cells than those in mtp53 or p53-null cells. Moreover, p53-siRNA-transfected HepG2 cells showed lower levels of apoptosis induced by oroxylin A than control-siRNA-transfected cells. Likewise, after oroxylin A treatment, p53-null K-562 cells displayed promoted apoptosis rate when transfected with wtp53 plasmid. Western blot and real-time RT-PCR assay revealed that oroxylin A markedly upregulated p53 protein expression in HepG2 and p53-overexpressing K-562 cells, but had no influence on p53 mRNA synthesis. Furthermore, after co-treatment with cycloheximide, oroxylin A still exerted a little effect on p53 expression. The negative regulator of p53, MDM2 protein was detected, and downregulated expression was observed. In the presence of MG132, an inhibitor of proteasome-mediated proteolysis, no change in p53 expression was obtained. Additionally, the antioxidant N-acetyl-L-cysteine could obviously abrogate p53 stabilization triggered by oroxylin A. Therefore, it is summarized that oroxylin A stabilized p53 expression and induced apoptosis at the posttranslational level via downregulating MDM2 expression and interfering MDM2-modulated proteasome-related p53 degradation. This indicated that oroxylin A could be served as a potential, novel agent candidate for cancer therapy.
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Affiliation(s)
- Rong Mu
- Jiangsu Key Laboratory of Carcinogenesis and Intervention, China Pharmaceutical University, Nanjing, People's Republic of China
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198
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Lu X, Chen Y, You Q. Pharmacophore Guided 3D-QSAR CoMFA Analysis of Amino Substituted Nitrogen Heterocycle Ureas as KDR Inhibitors. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/qsar.200960032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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199
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Lu X, Chen Y, You Q. 3D-QSAR, molecular docking studies, and binding mode prediction of thiolactomycin analogs as mtFabH inhibitors. J Enzyme Inhib Med Chem 2009; 25:240-9. [DOI: 10.3109/14756360903049059] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Xiaoyun Lu
- Department of Medicinal Chemistry, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, PR China
| | - Yadong Chen
- Department of Medicinal Chemistry, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, PR China
| | - Qidong You
- Department of Medicinal Chemistry, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, PR China
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200
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Abstract
Estrogen has important physiological effects on the growth and function of hormone-dependent tissues, and the link between estrogen and breast cancer has been deciphered at the end of the 20(th) century. Tamoxifen, one of the first generation selective estrogen receptor modulators (SERMs), has been the gold standard of first-line therapeutic drugs for all stages of estrogen-dependent breast cancer and has been found to reduce the incidence of breast cancer in high-risk pre- and postmenopausal women. Raloxifene, a second-generation SERM, was recently approved by FDA to decrease the risk of invasive breast cancer in postmenopausal women. During these years, many other novel types of SERAMs are being studied. This review highlights their recent advances. The discovery of selective estrogen receptor alpha modulators (SERAMs) and the latest information about their clinical and preclinical trials will be introduced intensively.
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Affiliation(s)
- Tianlin Wang
- China Pharmaceutical University, School of Pharmacy, Nanjing, 210009, Jiangsu Province, P.R. China
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