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Zhou Y, Chi M, Zhou Z, Wang L, Yuan L, Zheng L, Huang Y. Herb-drug interactions: Quantitative analysis of levofloxacin absorption and transporter expression in the rat intestine following combined treatment with Persicaria capitata (Buch.-Ham. ex D. Don) H. Gross. J Pharm Biomed Anal 2024; 245:116156. [PMID: 38636190 DOI: 10.1016/j.jpba.2024.116156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/14/2024] [Accepted: 04/15/2024] [Indexed: 04/20/2024]
Abstract
Persicaria capitata (Buch.-Ham. ex D. Don) H. Gross, a traditional Chinese medicinal plant, is often used to treat various urologic disorders in China. P. capitata extracts (PCE) have been used in combination with levofloxacin (LVFX) to treat urinary tract infections (UTIs) for a long time. However, little is known about the absorption of LVFX and transporter expression in the intestine after combined treatment with PCE, restricting the development and utilization of PCE. In view of this, a UPLC-MS/MS method was established for the determination of LVFX in intestinal sac fluid samples and in situ intestinal circulation perfusate samples to explore the effect of PCE on the intestinal absorption characteristics of LVFX ex vivo and in vivo. To further evaluate the interaction between LVFX and PCE, western blotting, immunohistochemistry, and RT-qPCR were utilized to determine the expression levels of drug transporters (OATP1A2, P-gp, BCRP, and MRP2) involved in the intestinal absorption of LVFX after combined treatment with PCE. Using the everted intestinal sac model, the absorption rate constant (Ka) and cumulative drug absorption (Q) of LVFX in each intestinal segment were significantly lower in groups treated with PCE than in the control group. Ka at 2 h decreased most in the colon segment (from 0.088 to 0.016 µg/h·cm2), and Q at 2 h decreased most in the duodenum (from 213.29 to 33.92 µg). Using the intestinal circulation perfusion model, the Ka value and percentage absorption rate (A) of LVFX in the small intestine decreased significantly when PCE and LVFX were used in combination. These results showed that PCE had a strong inhibitory effect on the absorption of LVFX in the rat small intestine (ex vivo and in vivo intestinal segments). In addition, PCE increased the protein and mRNA expression levels of efflux transporters (P-gp, BCRP, and MRP2) and decreased the expression of the uptake transporter OATP1A2 significantly. The effects increased as the PCE concentration increased. These findings indicated that PCE changed the absorption characteristics of levofloxacin, possibly by affecting the expression of transporters in the small intestine. In addition to revealing a herb-drug interaction (HDI) between PCE and LVFX, these results provide a basis for further studies of their clinical efficacy and mechanism of action.
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Affiliation(s)
- Yang Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang 550004, China
| | - Mingyan Chi
- School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang 550004, China; National Engineering Research Center of Miao's Medicines, Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education), Guizhou Medical University, Guiyang 550004, China
| | - Zuying Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang 550004, China
| | - Ling Wang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang 550004, China
| | - Li Yuan
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang 550004, China
| | - Lin Zheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China.
| | - Yong Huang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang 550004, China.
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Robinson AW, Nicholls D, Wells J, Moshtaghpour A, Chi M, Kirkland AI, Browning ND. Fast STEM Simulation Technique to Improve Quality of Inpainted Experimental Images Through Dictionary Transfer. Microsc Microanal 2023; 29:681-682. [PMID: 37613365 DOI: 10.1093/micmic/ozad067.336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- A W Robinson
- Mechanical, Materials, & Aerospace Engineering, University of Liverpool, Liverpool, U.K
| | - D Nicholls
- Mechanical, Materials, & Aerospace Engineering, University of Liverpool, Liverpool, U.K
| | - J Wells
- Distributed Algorithms CDT, University of Liverpool, Liverpool, U.K
| | - A Moshtaghpour
- Mechanical, Materials, & Aerospace Engineering, University of Liverpool, Liverpool, U.K
- Rosalind Franklin Institute, Harwell Science & Innovation Campus, Didcot, U. K
| | - M Chi
- Centre for Nanophase Materials Sciences, Oak Ridge National Laboratory, TN, USA
| | - A I Kirkland
- Rosalind Franklin Institute, Harwell Science & Innovation Campus, Didcot, U. K
- Department of Materials, University of Oxford, Oxford, U. K
| | - N D Browning
- Mechanical, Materials, & Aerospace Engineering, University of Liverpool, Liverpool, U.K
- Physical & Computational Science, Pacific Northwest National Lab, Richland, WA, USA
- Sivananthan Laboratories, 590 Territorial Drive, Bolingbrook, IL, USA
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Oxley MP, Lou W, Yoon M, Chi M. Using Realistic Valence Electron Wave Functions in 4D-STEM Simulations. Microsc Microanal 2023; 29:743-744. [PMID: 37613452 DOI: 10.1093/micmic/ozad067.366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- Mark P Oxley
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - Wei Lou
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - M Yoon
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - M Chi
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
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Zhou Y, Zhou Z, Zheng L, Gong Z, Li Y, Jin Y, Huang Y, Chi M. Urinary Tract Infections Caused by Uropathogenic Escherichia coli: Mechanisms of Infection and Treatment Options. Int J Mol Sci 2023; 24:10537. [PMID: 37445714 DOI: 10.3390/ijms241310537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 06/20/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023] Open
Abstract
Urinary tract infections (UTIs) are common bacterial infections that represent a severe public health problem. They are often caused by Escherichia coli (E. coli), Klebsiella pneumoniae (K. pneumonia), Proteus mirabilis (P. mirabilis), Enterococcus faecalis (E. faecalis), and Staphylococcus saprophyticus (S. saprophyticus). Among these, uropathogenic E. coli (UPEC) are the most common causative agent in both uncomplicated and complicated UTIs. The adaptive evolution of UPEC has been observed in several ways, including changes in colonization, attachment, invasion, and intracellular replication to invade the urothelium and survive intracellularly. While antibiotic therapy has historically been very successful in controlling UTIs, high recurrence rates and increasing antimicrobial resistance among uropathogens threaten to greatly reduce the efficacy of these treatments. Furthermore, the gradual global emergence of multidrug-resistant UPEC has highlighted the need to further explore its pathogenesis and seek alternative therapeutic and preventative strategies. Therefore, a thorough understanding of the clinical status and pathogenesis of UTIs and the advantages and disadvantages of antibiotics as a conventional treatment option could spark a surge in the search for alternative treatment options, especially vaccines and medicinal plants. Such options targeting multiple pathogenic mechanisms of UPEC are expected to be a focus of UTI management in the future to help combat antibiotic resistance.
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Affiliation(s)
- Yang Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmaceutical Sciences, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Zuying Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmaceutical Sciences, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Lin Zheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmaceutical Sciences, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Zipeng Gong
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Yueting Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Yang Jin
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Yong Huang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmaceutical Sciences, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Mingyan Chi
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmaceutical Sciences, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
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Zheng L, Zhou Y, Yan T, Gong Z, Li Y, Chen S, Huang Y, Chi M. Quality Control of Oleum Cinnamomi Assisted by Network Pharmacology Strategy. Molecules 2022; 27:molecules27196391. [PMID: 36234930 PMCID: PMC9573265 DOI: 10.3390/molecules27196391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/22/2022] [Accepted: 09/25/2022] [Indexed: 11/24/2022] Open
Abstract
Oleum Cinnamomi is a traditional medicine used by the Hmong, the essential oil obtained from Fructus Cinnamomi, for the treatment of coronary heart disease. Information regarding the efficient quality control markers of it is lacking, which has become a bottleneck restricting its development and utilization. Here, an integrated qualitative analysis approach based on a GC-MS and network pharmacology strategy was applied to explore quality control markers for the assessment of Oleum Cinnamomi. Firstly, the compounds of Oleum Cinnamomi were detected by GC-MS. In total, 57 chemical components were identified, mainly monoterpenes and sesquiterpenes, accounting for 83.05% of total essential oil components. Secondly, network pharmacology was adopted to explore the compounds linked to target genes of coronary heart disease. Fifty-two compounds were found, indicating the effectiveness of Oleum Cinnamomi in the treatment of coronary heart disease. Among them, 10 compounds, including eucalyptol, were chosen as potential effective compounds in Oleum Cinnamomi. Thirdly, an established GC-MS SIM method was validated and applied for the simultaneous determination of the contents of these 10 compounds using 20 sample batches of Oleum Cinnamomi. It was preliminarily found that the contents of these 10 compounds differed in Oleum Cinnamomi from different origins. Finally, quantitative analyte data were analyzed using multivariate statistical analysis to determine Oleum Cinnamomi quality. Four compounds (eucalyptol, p-cymene, sabinene, β-pinene) were identified as chemical markers for quality control. Accordingly, this study provides new strategies to explore the quality control markers and develops a novel method for the quality assessment of Oleum Cinnamomi.
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Affiliation(s)
- Lin Zheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmacy, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Yang Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmacy, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Ting Yan
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmacy, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Zipeng Gong
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Yueting Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Siying Chen
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
| | - Yong Huang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmacy, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- Correspondence: (Y.H.); (M.C.)
| | - Mingyan Chi
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- School of Pharmacy, Guizhou Medical University, 4 Beijing Road, Guiyang 550004, China
- Correspondence: (Y.H.); (M.C.)
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Li Y, Meng W, Yuan L, Jiang L, Zhou Z, Chi M, Gong Z, Ma X, Huang Y, Zheng L. Identification of Protosappanoside D from Caesalpinia decapetala and Evaluation of Its Pharmacokinetic, Metabolism and Pharmacological Activity. Molecules 2022; 27:molecules27186090. [PMID: 36144821 PMCID: PMC9506044 DOI: 10.3390/molecules27186090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 09/14/2022] [Accepted: 09/15/2022] [Indexed: 11/25/2022] Open
Abstract
Protosappanoside D (PTD) is a new component isolated from the extract of Caesalpinia decapetala for the first time. Its structure was identified as protosappanin B-3-O-β-D-glucoside by 1H-NMR, 13C-NMR, 2D-NMR and MS techniques. To date, the pharmacological activities, metabolism or pharmacokinetics of PTD has not been reported. Therefore, this research to study the anti-inflammatory activity of PTD was investigated via the LPS-induced RAW264.7 cells model. At the same time, we also used the UHPLC/Q Exactive Plus MS and UPLC-MS/MS methods to study the metabolites and pharmacokinetics of PTD, to calculate its bioavailability for the first time. The results showed that PTD could downregulate secretion of the pro-inflammatory cytokines. In the metabolic study, four metabolites were identified, and the primary degradative pathways in vivo involved the desaturation, oxidation, methylation, alkylation, dehydration, degradation and desugarization. In the pharmacokinetic study, PTD and its main metabolite protosappanin B (PTB) were measured after oral and intravenous administration. After oral administration of PTD, its Tmax was 0.49 h, t1/2z and MRT(0–t) were 3.47 ± 0.78 h and 3.06 ± 0.63 h, respectively. It shows that PTD was quickly absorbed into plasma and it may be eliminated quickly in the body, and its bioavailability is about 0.65%.
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Affiliation(s)
- Yueting Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China
| | - Wensha Meng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China
- School of Pharmacy, Guizhou Medical University, Guiyang 550004, China
| | - Li Yuan
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China
- School of Pharmacy, Guizhou Medical University, Guiyang 550004, China
| | - Li Jiang
- Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education), Guizhou Medical University, Guiyang 550004, China
| | - Zuying Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China
- School of Pharmacy, Guizhou Medical University, Guiyang 550004, China
| | - Mingyan Chi
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China
| | - Zipeng Gong
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China
| | - Xue Ma
- Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education), Guizhou Medical University, Guiyang 550004, China
| | - Yong Huang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China
- Correspondence: (Y.H.); (L.Z.)
| | - Lin Zheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China
- Correspondence: (Y.H.); (L.Z.)
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Zheng L, Zhou T, Liu H, Zhou Z, Chi M, Li Y, Gong Z, Huang Y. Pharmacokinetics Study of Jin-Gu-Lian Prescription and Its Core Drug Pair ( Sargentodoxa cuneata (Oliv.) Rehd. et W and Alangium chinense (Lour.) Harms) by UPLC-MS/MS. Molecules 2022; 27:molecules27134025. [PMID: 35807271 PMCID: PMC9268445 DOI: 10.3390/molecules27134025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/09/2022] [Accepted: 06/13/2022] [Indexed: 01/05/2023] Open
Abstract
Jin-Gu-Lian (JGL) is traditionally used by Miao for the treatment of rheumatism arthralgia. At the same time, the combination of Sargentodoxa cuneata (Oliv.) Rehd. et W (SC) and Alangium chinense (Lour.) Harms (AC), the core drug pair (CDP) in the formula of JGL, is used at high frequencies in many Miao medicine prescriptions for rheumatic diseases. However, previous research lacks the pharmacokinetic study of JGL, and study on the compatibility of its CDP with other medicinal herbs in the formula is needed. This study aims to establish a simple, rapid, and sensitive Ultra Performance Liquid Chromatography Tandem Mass Spectrometry (UPLC-MS/MS) method for the simultaneous determination of four main bioactive components of JGL in rat plasma, including Salidroside (Sal), Anabasine (Ana), Chlorogenic Acid (CA), and Protocatechuic Acid (PCA), and compare the pharmacokinetic properties of two groups of rats after being orally administrated with JGL and its CDP extracts, respectively. The results showed that area under the plasma concentration-time curve (AUC), mean retention time (MRT), and clearance rate (CL), of Sal, Ana, CA and PCA in the two groups of rats were changed in different degrees. The CDP combined with other drugs could significantly increase the absorption of Sal and Ana, prolong its retention time in vivo, and may accelerate the absorption rate of CA and PCA. This indicated that the combination of CDP and other herbs may affect the pharmacokinetics process of active components in vivo, increase the exposure and bioavailability of compounds in the JGL group, and prolong the retention time, which may be the reason why JGL has a better inhibitory effect on inflammatory cytokines, providing a viable orientation for the compatibility investigation of herb medicines.
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Affiliation(s)
- Lin Zheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; (L.Z.); (T.Z.); (H.L.); (Z.Z.); (Y.L.)
| | - Ting Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; (L.Z.); (T.Z.); (H.L.); (Z.Z.); (Y.L.)
- School of Pharmacy, Guizhou Medical University, Guiyang 550004, China;
| | - Hui Liu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; (L.Z.); (T.Z.); (H.L.); (Z.Z.); (Y.L.)
- School of Pharmacy, Guizhou Medical University, Guiyang 550004, China;
| | - Zuying Zhou
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; (L.Z.); (T.Z.); (H.L.); (Z.Z.); (Y.L.)
- School of Pharmacy, Guizhou Medical University, Guiyang 550004, China;
| | - Mingyan Chi
- School of Pharmacy, Guizhou Medical University, Guiyang 550004, China;
- Engineering Research Center for the Development and Application of Ethnic Medicine and TCM (Ministry of Education), Guizhou Medical University, Guiyang 550004, China
| | - Yueting Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; (L.Z.); (T.Z.); (H.L.); (Z.Z.); (Y.L.)
| | - Zipeng Gong
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; (L.Z.); (T.Z.); (H.L.); (Z.Z.); (Y.L.)
- Correspondence: (Z.G.); (Y.H.); Tel.: +86-851-86908468 (Y.H.)
| | - Yong Huang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Provincial Key Laboratory of Pharmaceutics, Guizhou Medical University, Guiyang 550004, China; (L.Z.); (T.Z.); (H.L.); (Z.Z.); (Y.L.)
- Correspondence: (Z.G.); (Y.H.); Tel.: +86-851-86908468 (Y.H.)
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Xu X, Huang L, Wu R, Zhang W, Ding G, Liu L, Chi M, Xie J. Multi-Feature Fusion Method for Identifying Carotid Artery Vulnerable Plaque. Ing Rech Biomed 2021. [DOI: 10.1016/j.irbm.2021.07.004] [Citation(s) in RCA: 1] [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: 12/18/2022]
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Li Y, Wang Y, Chi M. The diagnostic value of high-frequency ultrasound combined with color Doppler ultrasound versus surgical pathology in gallbladder polyps. Am J Transl Res 2021; 13:7990-7996. [PMID: 34377280 PMCID: PMC8340239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 03/19/2021] [Indexed: 06/13/2023]
Abstract
OBJECTIVE This study aimed to analyze the value of high-frequency ultrasound combined with color Doppler ultrasound in the diagnosis of gallbladder polyps. METHODS A retrospective analysis was performed on 108 patients with gallbladder polyps, all of whom were examined by high-frequency ultrasound and color Doppler ultrasound with surgical or pathological findings as the gold standard. RESULTS Taking surgical pathology findings as the gold standard, the diagnostic accuracy, sensitivity and specificity of high-frequency ultrasound for gallbladder polyps were 63.89%, 63.27%, and 70.00%, respectively. The diagnostic accuracy, sensitivity and specificity of color Doppler ultrasound were 74.07%, 73.47%, and 80.00%, respectively. The diagnostic accuracy, sensitivity and specificity of high-frequency ultrasound combined with color Doppler ultrasound were 91.67%, 90.82%, and 100.00%, respectively. The proportion of mulberry-like or papillary projections was 56.18% in 89 benign lesions diagnosed by high-frequency ultrasound combined with color Doppler ultrasound, the proportion of hyperechoic lesion was 47.19%, and the proportion of single lesion was 59.55%. The incidence rate of blood flow signal was 26.97% in 89 benign lesions, including 10 cases of punctiform blood flow signal, 9 cases of band-like blood flow signal and 5 cases of multiple stones in the lumen of the gallbladder. CONCLUSION High-frequency ultrasound combined with color Doppler ultrasound has high accuracy in the diagnosis of gallbladder polyps, and can yield better diagnostic results than either method, which can be used as an optional method for the diagnosis of gallbladder polyps.
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Zhao Y, Chi M, Zhang X, Wang S, Liu J, Liang W, Huang J. Expression, Purification, Crystallization and X-Ray Crystallographic Analysis of MoDabb1 from Magnaporthe oryzae. CRYSTALLOGR REP+ 2020. [DOI: 10.1134/s1063774519070307] [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: 11/23/2022]
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Yang X, Wang X, Chi M, Zhang M, Shan H, Zhang QH, Zhang J, Shi J, Zhang JZ, Wu RM, Li YL. Osteoprotegerin mediate RANK/RANKL signaling inhibition eases asthma inflammatory reaction by affecting the survival and function of dendritic cells. Allergol Immunopathol (Madr) 2019; 47:179-184. [PMID: 30292447 DOI: 10.1016/j.aller.2018.06.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 05/22/2018] [Accepted: 06/13/2018] [Indexed: 12/21/2022]
Abstract
INTRODUCTION Asthma is a chronic inflammatory, heterogeneous airway disease affecting millions of people around the world. Dendritic cells (DCs) are considered the most important antigen-presenting cell in asthma airway inflammatory reaction. But whether osteoprotegerin (OPG) mediate RANK/RANKL signaling inhibition influences asthma development by affecting the survival and function of DCs remains unclear. In this study, we assessed the effects of OPG on DCs and asthma. MATERIAL AND METHODS BALB/c mice immunized with ovalbumin (OVA) were challenged thrice with an aerosol of OVA every second day for eight days. Dexamethasone (1.0mg/kg) or OPG (50μg/kg) was administered intraperitoneally to OVA-immunized BALB/c mice on day 24 once a day for nine days. Mice were analyzed for effects of OPG on asthma, inflammatory cell infiltration and cytokine levels in lung tissue. The expression of RANK and β-actin was detected by Western Blot. DCs were isolated from mouse bone morrow. Cell survival was assessed by cell counting. The content of IL-12 was detected by ELISA. RESULTS Results showed that OVA increased the number of inflammatory factors in BALF, elevated lung inflammation scores in mice. OPG reversed the alterations induced by OVA in the asthmatic mice. OPG inhibited the survival and function of DC via inhibition of RANK/RANKL signaling. CONCLUSIONS This research proved inhibition of RANK/RANKL signaling by OPG could ease the inflammatory reaction in asthma, providing new evidence for the application of OPG on asthma.
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Affiliation(s)
- X Yang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - X Wang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - M Chi
- Department of Pediatrics, BaYi Children's Hospital of the PLA Army General Hospital, Beijing, China; The Clinical Medical College of the PLA Army, Second Military Medical University of People's Liberation Army, Shanghai, China
| | - M Zhang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - H Shan
- Department of Respiratory Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Q-H Zhang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - J Zhang
- Department of Respiratory Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - J Shi
- Department of Respiratory Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - J-Z Zhang
- Department of Respiratory Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - R-M Wu
- Department of Respiratory Medicine, Shaanxi Provincial People's Hospital, Xi'an, China
| | - Y-L Li
- Department of Respiratory Medicine, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China.
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Skelding K, Gilchrist J, Pearsall E, Chi M, Bowden N, Lincz L. PO-144 Role of increased expression of brain and acute leukaemia, cytoplasmic (BAALC) in acute myeloid leukaemia (AML) DNA damage repair pathways. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.185] [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: 11/04/2022] Open
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Chi M, Wan YM, Gao JB. [Recurrent episodes of syncope caused by left main trunk originated from the right coronary sinus: a case report]. Zhonghua Xin Xue Guan Bing Za Zhi 2018; 46:232-233. [PMID: 29562433 DOI: 10.3760/cma.j.issn.0253-3758.2018.03.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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Wi JM, Sung KH, Chi M. 'Orbital volume restoration rate after orbital fracture'; a CT-based orbital volume measurement for evaluation of orbital wall reconstructive effect. Eye (Lond) 2017; 31:713-719. [PMID: 28085134 DOI: 10.1038/eye.2016.311] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 11/27/2016] [Indexed: 11/09/2022] Open
Abstract
PurposeTo evaluate the effect of orbital reconstruction and factors related to the effect of orbital reconstruction by assessing of orbital volume using orbital computed tomography (CT) in cases of orbital wall fracture.MethodsIn this retrospective study, 68 patients with isolated blowout fractures were evaluated. The volumes of orbits and herniated orbital tissues were determined by CT scans using a three-dimensional reconstruction technique (the Eclipse Treatment Planning System). Orbital CT was performed preoperatively, immediately after surgery, and at final follow ups (minimum of 6 months). We evaluated the reconstructive effect of surgery making a new formula, 'orbital volume reconstruction rate' from orbital volume differences between fractured and contralateral orbits before surgery, immediately after surgery, and at final follow up.ResultsMean volume of fractured orbits before surgery was 23.01±2.60 cm3 and that of contralateral orbits was 21.31±2.50 cm3 (P=0.005). Mean volume of the fractured orbits immediately after surgery was 21.29±2.42 cm3, and that of the contralateral orbits was 21.33±2.52 cm3 (P=0.921). Mean volume of fractured orbits at final follow up was 21.50±2.44 cm3, and that of contralateral orbits was 21.32±2.50 cm3 (P=0.668). The mean orbital volume reconstruction rate was 100.47% immediately after surgery and 99.17% at final follow up. No significant difference in orbital volume reconstruction rate was observed with respect to fracture site or orbital implant type. Patients that underwent operation within 14 days of trauma had a better reconstruction rate at final follow up than patients who underwent operation over 14 days after trauma (P=0.039).ConclusionComputer-based measurements of orbital fracture volume can be used to evaluate the reconstructive effect of orbital implants and provide useful quantitative information. Significant reduction of orbital volume is observed immediately after orbital wall reconstruction surgery and the reconstruction effect is maintained for more than minimum 6 months. Patients that undergo surgery within 14 days of trauma has better reconstruction rates at final follow up, which supports the need for early surgery.
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Affiliation(s)
- J M Wi
- Department of Ophthalmology, Konyang University, Kim's Eye Hospital, Seoul, Korea
| | - K H Sung
- Department of Radiation Oncology, Gachon University Gil Medical Center, Incheon, Korea
| | - M Chi
- Department of Ophthalmology, Gachon University Gil Medical Center, Incheon, Korea
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Chi M, Kim HJ, Vagefi R, Kersten RC. Modified tarsotomy for the treatment of severe cicatricial entropion. Eye (Lond) 2016; 30:992-7. [PMID: 27101749 DOI: 10.1038/eye.2016.77] [Citation(s) in RCA: 8] [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: 08/29/2015] [Accepted: 02/25/2016] [Indexed: 11/09/2022] Open
Abstract
PurposeTo analyze the efficacy of modified tarsotomy for the management of severe cicatricial entropion.MethodsTwenty-seven eyelids of 18 patients who underwent modified tarsotomy between March 2011 and July 2013 were retrospectively assessed. The data collected included patient demographics, etiology of cicatricial entropion, and surgical history. Outcome measures included surgical success rate, preoperative and postoperative eyelid position, and surgery-related complications.ResultsMean follow-up time was 13.2 months (range, 6-25.4 months), and the success rate was 81.8% (22 of 27 eyelids). Complications included eyelid margin notching (n=1) and blepharoptosis secondary to avascular necrosis of the distal marginal fragment (n=1), both were corrected by minor surgical intervention.ConclusionsThe study findings suggest modified tarsotomy is effective for the correction of severe cicatricial entropion.
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Affiliation(s)
- M Chi
- Department of Ophthalmology, Gachon University Gil Hospital, Incheon, Korea.,Department of Ophthalmology, University of California San Francisco, San Francisco, CA, USA
| | - H J Kim
- Department of Ophthalmology, University of California San Francisco, San Francisco, CA, USA.,Department of Ophthalmology, Permanente Medical Group, Hayward, CA, USA
| | - R Vagefi
- Department of Ophthalmology, University of California San Francisco, San Francisco, CA, USA
| | - R C Kersten
- Department of Ophthalmology, University of California San Francisco, San Francisco, CA, USA
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16
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Chi M, Zhang L, Li JG, Qiu FB, Zhao YF, Wu YN. [The survey of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzo-p-furans and dioxin-like polychlorinated bophenyls in twenty-eight market beef]. Zhonghua Yu Fang Yi Xue Za Zhi 2016; 50:364-366. [PMID: 27029371 DOI: 10.3760/cma.j.issn.0253-9624.2016.04.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- M Chi
- School of Public Health, Shanxi Medical University, Shanxi 030001, China
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Moon H, Kim Y, Wi JM, Chi M. Morphological characteristics and clinical manifestations of orbital emphysema caused by isolated medial orbital wall fractures. Eye (Lond) 2016; 30:582-7. [PMID: 26795415 DOI: 10.1038/eye.2015.285] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 12/08/2015] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To investigate the morphological characteristics and clinical manifestations of orbital emphysema in patients with isolated medial orbital wall fractures. METHODS This was a retrospective observational case series of 348 orbits of 348 patients with isolated medial orbital wall fractures. Medical charts were reviewed, and computed tomographic (CT) images were examined to determine the morphological characteristics of orbital emphysema. RESULTS Orbital emphysema was detected in 70 orbits (20.1%). Large and communited type fracture was related with the presence of orbital emphysema (P<0.05). Orbital air pockets were detected in medial or superior extraconal orbital segment in all cases with orbital emphysema. Swollen eyelid with crepitus (90.0%) and supraduction limitation (31.4%) were developed with orbital emphysema. All cases with supraduction limitation accompanied with superior extraconal orbital emphysema and superior rectus muscle deviation, and these eyes were fully recovered with conservative management without surgery. CONCLUSIONS Orbital emphysema can be a cause of ocular motility restriction following orbital wall fracture. If supraduction limitation is noted with isolated medial wall fracture and superior orbital emphysema with superior rectus muscle deviation is detected by CT scan, conservative management can be a good choice for spontaneous recovery delaying the surgery.
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Affiliation(s)
- H Moon
- Yeonsu Ever Bright Eye Clinic, Incheon, Korea
| | - Y Kim
- Department of Ophthalmology, Gachon University Gil Hospital, Incheon, Korea
| | - J M Wi
- Department of Ophthalmology, Gachon University Gil Hospital, Incheon, Korea
| | - M Chi
- Department of Ophthalmology, Gachon University Gil Hospital, Incheon, Korea
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Cao Y, Li D, Xu B, Wang M, Zhen N, Man L, Zhang Y, Chi M. A microRNA-152 that targets the phosphatase and tensin homolog to inhibit low oxygen induced-apoptosis in human brain microvascular endothelial cells. Genet Mol Res 2016; 15:gmr7371. [DOI: 10.4238/gmr.15027371] [Citation(s) in RCA: 9] [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: 11/03/2022]
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Zhang L, Roling LT, Wang X, Vara M, Chi M, Liu J, Choi SI, Park J, Herron JA, Xie Z, Mavrikakis M, Xia Y. Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets. Science 2015. [DOI: 10.1126/science.aab0801] [Citation(s) in RCA: 735] [Impact Index Per Article: 81.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Omari S, Waters M, Naranian T, Kim K, Perumalsamy AL, Chi M, Greenblatt E, Moley KH, Opferman JT, Jurisicova A. Mcl-1 is a key regulator of the ovarian reserve. Cell Death Dis 2015; 6:e1755. [PMID: 25950485 PMCID: PMC4669721 DOI: 10.1038/cddis.2015.95] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 02/07/2015] [Accepted: 02/18/2015] [Indexed: 02/05/2023]
Abstract
A majority of ovarian follicles are lost to natural death, but the disruption of factors involved in maintenance of the oocyte pool results in a further untimely follicular depletion known as premature ovarian failure. The anti-apoptotic B-cell lymphoma 2 (Bcl-2) family member myeloid cell leukemia-1 (MCL-1) has a pro-survival role in various cell types; however, its contribution to oocyte survival is unconfirmed. We present a phenotypic characterization of oocytes deficient in Mcl-1, and establish its role in maintenance of the primordial follicle (PMF) pool, growing oocyte survival and oocyte quality. Mcl-1 depletion resulted in the premature exhaustion of the ovarian reserve, characterized by early PMF loss because of activation of apoptosis. The increasingly diminished surviving cohort of growing oocytes displayed elevated markers of autophagy and mitochondrial dysfunction. Mcl-1-deficient ovulated oocytes demonstrated an increased susceptibility to cellular fragmentation with activation of the apoptotic cascade. Concomitant deletion of the pro-apoptotic Bcl-2 member Bcl-2-associated X protein (Bax) rescued the PMF phenotype and ovulated oocyte death, but did not prevent the mitochondrial dysfunction associated with Mcl-1 deficiency and could not rescue long-term breeding performance. We thus recognize MCL-1 as the essential survival factor required for conservation of the postnatal PMF pool, growing follicle survival and effective oocyte mitochondrial function.
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Affiliation(s)
- S Omari
- 1] Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Toronto, Ontario M5T 3H7, Canada [2] Department of Physiology, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - M Waters
- Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Toronto, Ontario M5T 3H7, Canada
| | - T Naranian
- 1] Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Toronto, Ontario M5T 3H7, Canada [2] Department of Physiology, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - K Kim
- 1] Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Toronto, Ontario M5T 3H7, Canada [2] Department of Physiology, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - A L Perumalsamy
- Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Toronto, Ontario M5T 3H7, Canada
| | - M Chi
- Department of Obstetrics and Gynecology, Washington University in St. Louis, 660S Euclid Avenue, St. Louis, MO 63110, USA
| | - E Greenblatt
- 1] Centre for Fertility and Reproductive Health, Mount Sinai Hospital, 250 Dundas Street, Toronto, Ontario M5T 2Z5, Canada [2] Department of Obstetrics and Gynecology, University of Toronto, 92 College Street, Toronto, Ontario M5G 1L4, Canada
| | - K H Moley
- Department of Obstetrics and Gynecology, Washington University in St. Louis, 660S Euclid Avenue, St. Louis, MO 63110, USA
| | - J T Opferman
- Department of Biochemistry, St. Jude Children's Research Hospital, MS 340, Room D4063D, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - A Jurisicova
- 1] Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, 25 Orde Street, Toronto, Ontario M5T 3H7, Canada [2] Department of Physiology, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada [3] Department of Obstetrics and Gynecology, University of Toronto, 92 College Street, Toronto, Ontario M5G 1L4, Canada
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Chi M, Chen J, Ye Y, Tseng HY, Lai F, Tay KH, Jin L, Guo ST, Jiang CC, Zhang XD. Adipocytes contribute to resistance of human melanoma cells to chemotherapy and targeted therapy. Curr Med Chem 2014; 21:1255-67. [PMID: 24304284 DOI: 10.2174/0929867321666131129114742] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2013] [Revised: 11/08/2013] [Accepted: 11/25/2013] [Indexed: 11/22/2022]
Abstract
Epidemiological evidence has linked the development and progression of several cancers including melanoma with obesity. However, whether obesity impinges on responses of cancer cells to treatment remains less understood. Here we report that human adipocytes contribute to resistance of melanoma cells to various therapeutic agents. Exposure to media from adipocyte cultures (adipocyte media) increased cell proliferation and reduced sensitivity of melanoma cells to apoptosis induced by diverse chemotherapeutic drugs, including the DNA-damaging drug cisplatin, the microtubuletargeting agent docetaxel, and the histone deacetylase inhibitor SAHA. This was associated with increased activation of PI3K/Akt and MEK/ERK signaling, and was attenuated by a PI3K or MEK inhibitor. The effect of adipocyte media on melanoma cells was, at least in part, due to the interaction between the adipokine leptin and its long form receptor OB-Rb, in that immunodepletion of leptin in adipocyte media or siRNA knockdown of OB-Rb in melanoma cells reversed the increase in Akt and ERK activation, enhancement in cell proliferation, and importantly, protection of melanoma cells against the drugs. In support, recombinant leptin partially recapitulated the effect of adipocyte media on melanoma cells. Of note, OB-Rb was increased on the surface of melanoma cells compared to melanocytes, whereas leptin short form receptors appeared to be suppressed post-transcriptionally, suggesting that OB-Rb was selectively upregulated in melanoma cells. Collectively, these results indicate that adipocytes contribute to the resistance of melanoma cells to chemotherapeutic drugs and agents targeting the PI3K/Akt and MEK/ERK pathways, and suggest that inhibition of the leptin/ OB-Rb system may be useful to improve the efficacy of multiple therapeutic approaches in the treatment of melanoma.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - X D Zhang
- LS3-49, Life Science Building, University of Newcastle, Callaghan, NSW, Australia.
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Ahluwalia M, Venur VA, Chi M, Chao S, Lilyana A, Elson P, Suh J, Barnett G. BM-02 * NEW DISEASE SPECIFIC GRADED PROGNOSTIC ASSESSMENT OF BRAIN METASTASIS FROM LUNG, BREAST, MELANOMA AND RENAL MALIGNANCIES. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou240.2] [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: 11/13/2022] Open
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Chen C, Kang Y, Huo Z, Zhu Z, Huang W, Xin HL, Snyder JD, Li D, Herron JA, Mavrikakis M, Chi M, More KL, Li Y, Markovic NM, Somorjai GA, Yang P, Stamenkovic VR. Highly Crystalline Multimetallic Nanoframes with Three-Dimensional Electrocatalytic Surfaces. Science 2014; 343:1339-43. [DOI: 10.1126/science.1249061] [Citation(s) in RCA: 2051] [Impact Index Per Article: 205.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Beekman C, Siemons W, Ward TZ, Chi M, Howe J, Biegalski MD, Balke N, Maksymovych P, Farrar AK, Romero JB, Gao P, Pan XQ, Tenne DA, Christen HM. Phase transitions, phase coexistence, and piezoelectric switching behavior in highly strained BiFeO(3) films. Adv Mater 2013; 25:5561-7. [PMID: 23847158 DOI: 10.1002/adma.201302066] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Indexed: 05/12/2023]
Abstract
Highly strained BiFeO3 films transition into a true tetragonal state at 430 °C but remain polar to much higher temperatures (∼800 °C). Piezoelectric switching is only possible up to 300 °C, i.e., at temperatures for which strain stabilizes the stripe-like coexistence of multiple polymorphs.
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Affiliation(s)
- C Beekman
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
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Tseng H, Chi M, Smith N, Marcy S, Sy L, Jacobsen S. Effectiveness of herpes zoster vaccine on recurrent herpes zoster among an immunocompetent elderly population. Int J Infect Dis 2012. [DOI: 10.1016/j.ijid.2012.05.1017] [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: 10/28/2022] Open
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Beaber B, Chi M, Brara S, Zhang J, Langer-Gould A. Treatment with Beta-Interferons or Glatiramer Acetate and the Risk of Postpartum Multiple Sclerosis Relapses (P06.192). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p06.192] [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: 11/15/2022] Open
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Wang A, Chi M, Wang Y, Li Y, Fu X. [Simultaneous determination of eight components in Polygonum orientale by ultra performance liquid chromatography (UPLC) method]. Zhongguo Zhong Yao Za Zhi 2010; 35:1723-1727. [PMID: 20862966 DOI: 10.4268/cjcmm20101316] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this study, a UPLC-PDA method for simultaneous determination of catechin(1), isoorientin(2), orientin(3), quercetin-3-O-(2"-O-alpha-rhamnopyranosyl)-beta-glucarono-pyranoside(4), taxifoliol(5), luteolin(6), quercitrin(7) and kaempferol-3-O-beta-D-glucoside(8) in Polygonum orientale in Guizhou province was developed. Analysis was performed at 45 degrees C, on ACQUITY UPLC BEH C18 column (2.1 mm x 150 mm, 1.7 microm), eluted with a gradient program of acetonitrile-0.1% H3PO4 aqueous solution as the mobile phases. The flow rate was of 0.30 mL x min(-1), and the detection wavelength was 260 nm. The method validation proved that the linearity, instrument precision, repeatability, intermediate precision and accuracy accorded with the requirement for anassay. The established method had been used for determination above eight components in twenty lots of P. orientale in different places and harvest time in Guizhou province, and the results showed that the chemical composition was basically the same in herbs, but there were some difference in content of the tested components. the contents of the tested ingredients were relatively high and stable in the sample collected in August.
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Affiliation(s)
- Aimin Wang
- School of Pharmacy, Guiyang Medical College, Guiyang 550004, China
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Diedrichs H, Hagemeister J, Chi M, Boelck B, Müller-Ehmsen J, Schneider CA. Activation of the calcineurin/NFAT signalling cascade starts early in human hypertrophic myocardium. J Int Med Res 2008; 35:803-18. [PMID: 18034994 DOI: 10.1177/147323000703500609] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Cardiac hypertrophy is an independent risk factor for heart failure. Recent studies on gene regulation of proteins have involved intracellular Ca2+ homeostasis. The Ca2+-sensitive phosphatase, calcineurin, is one potential regulator of the hypertrophic response, so we aimed to investigate the calcineurin-dependent signal pathway at different stages of hypertrophy in human myocardium. We found the calcineurin pathway to be significantly activated in hypertrophic compared with non-hypertrophic myocardium as demonstrated by increased calcineurin activity and expression of calcineurin A-beta and B, and GATA-4, and a shift of phosphorylated cytoplasmic NFAT-3 into the nucleus as dephosphorylated nuclear NFAT-3. There was a tendency for these changes to be more pronounced in the decompensated compared with the compensated hypertrophic myocardium. The present study provides evidence for significant activation of the Ca2+-triggered calcineurin pathway in hypertrophic humans. Already present in compensated hypertrophy it showed a tendency to a further increase following transition to decompensated hypertrophy.
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Affiliation(s)
- H Diedrichs
- Laboratory of Muscle Research and Molecular Cardiology, Department of Internal Medicine, University of Cologne, Cologne, Germany.
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Liu H, Choi B, Zhang J, Tutt T, Chi M, Wang C, Luo D, Prado K, Mohan R, Dong L, Balter P. Assessing Respiration-Induced Tumor Motion and Margin of Internal Target Volume for Image-Guided Radiotherapy of Lung Cancers. Int J Radiat Oncol Biol Phys 2005. [DOI: 10.1016/j.ijrobp.2005.07.058] [Citation(s) in RCA: 6] [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: 11/28/2022]
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Abstract
Insulin-like growth factors are involved in the regulation of gonadotropin secretion. Insulin-like growth factor I (IGF-I) has an augmenting effect on gonodotropin-releasing hormone (GnRH)-induced luteinizing hormone (LH) release from female rat gonadotrophs that is facilitated by estradiol. To identify the underlying mechanisms, we investigated whether IGF-I influences total LH pool and the production of intracellular inositol phosphate. In another series of experiments we tested whether IGF-II and estradiol affect LH release of gonadotrophs. Pituitary cells were incubated with 100 pM IGF-I and/or 100 pM estradiol for 24 h. They were stimulated, partially in the presence of Wortmannin, an inhibitor of phosphoinositide 3-kinase, with 330 pM GnRH for 3 h. Subsequently, total LH pool (released and remaining hormone content in lysed cells) in cultures was measured. Intracellular inositol trisphosphate of alphaT3-1 cells, a gonadotrope cell line, treated with estradiol and IGF-I as described before and stimulated with 100 nM GnRH for 15 min was analyzed by ion exchange chromatography. To determine the interaction of IGF-II and estradiol on GnRH-stimulated LH secretion, cells were treated with increasing concentrations of IGF-II (0.05 pM-10 nM) and 100 pM estradiol. IGF-I significantly increased the accumulation of inositol trisphosphate in basal and GnRH-stimulated cells. IGF-I, estradiol, or their combinations did not change total LH pool, although they enhanced LH secretion. Wortmannin abolished the positive effects of IGF-I and estradiol on LH secretion. IGF-II alone increased basal, but not GnRH-induced LH secretion at low concentrations (0.05 pM). Additional estradiol treatment further increased basal, but not GnRH-induced LH secretion. In conclusion, our results suggest that increased LH secretion from female anterior pituitary cells after IGF treatment is due to the amplification of early signal transduction steps rather than changes in LH pool. The inositol trisphosphate signaling pathway is involved in the regulation of LH secretion from gonadotrophs treated with IGF-I. It is not likely that IGF-II plays an important role in the regulation of gonadotropin secretion.
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Affiliation(s)
- J M Weiss
- Department of Obstetrics and Gynecology, Medical University of Luebeck, Ratzeburger Allee 160, 23538 Luebeck, Germany.
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Abstract
To assess the Karnofsky Performance Status (KPS) scale and the Eastern Cooperative Oncology Group (ECOG) scale with respect to interobserver reliability and interobserver difference between the two scales, 100 consecutive patients in a medical oncology unit were assessed using both scales, which were then given to three independent raters and also to the patients themselves. There was a high level of agreement between most paired assessors. There were three exceptions, which were the RMO/patient and nurse/patient pairs on the KPS scale and the RMO/patient pair on the ECOG scale. The level of agreement was better on the ECOG scale. For individual raters there is no statistical difference between the ECOG and Karnofsky scales. There was good agreement between all raters for both scales. Interobserver variability was less using the ECOG scale. We conclude that either scale could be used with good interobserver reliability. The ECOG scale minimises differences between observers.
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Affiliation(s)
- A E Taylor
- Department of Medical Oncology, Royal Adelaide Hospital Cancer Centre, Royal Adelaide Hospital, SA, Australia
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Taylor A, Olver I, Sivanthan T, Chi M, Purnell C. Observer error in grading performance status in cancer patients. Eur J Cancer 1999. [DOI: 10.1016/s0959-8049(99)81891-7] [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: 11/30/2022]
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Abstract
Organophosphate and other ligands were examined for binding on the membrane-bond nicotinic receptor at three conformational states. Soman (pinacolyl methylphosphonofluoridate), sarin (isopropyl methylphosphonofluoridate, tabun (ethyl N-dimethylphosphoramidocyanidate) and phencyclidine did not show any effect on the binding of [25I]alpha-cobrotoxin to the nicotinic receptor. However, VX, O-ethyl-S-(2-diisopropylaminoethyl) methylphosphonothiolate, at concentrations higher than 10 umol/L exhibited profound inhibition on the equilibrium binding rates in a concentration-dependent manner. Agonist nicotine and antagonist d-tubocurarine also showed significant inhibitions.
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Affiliation(s)
- M Chi
- Institute of Pharmacology and Toxicology, Beijing, China
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Sank A, Chi M, Shima T, Reich R, Martin GR. Increased calcium levels alter cellular and molecular events in wound healing. Surgery 1989; 106:1141-7; discussion 1147-8. [PMID: 2555928] [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: 01/01/2023]
Abstract
Surgical morbidity is dictated directly by wound healing. We have studied the effects of elevated calcium levels using cultured keratinocytes in vitro on two of the rate-limiting steps of wound healing, chemotaxis (directed migration) and adhesion. We found that the increased calcium (10 mmol/L) significantly inhibited both keratinocyte chemotaxis and adhesion (p less than 0.05). The calcium effect on adhesion could be partially reversed by pretreatment with the calcium channel blocker verapamil. Based on these data, an animal model was formulated in which topical calcium (5 mmol/L/day) was added to linear incision wounds. This resulted in significantly (p less than 0.05) delayed wound contraction characteristic of a chronic or impaired wound. Wound contraction depends on the presence of fibroblasts that synthesize collagen. The chronic wound was characterized by increased collagenase activity (p less than 0.05) but little alteration in collagen I synthesis. The addition of verapamil to these chronic wounds resulted in improved wound closure. These studies define the molecular and cellular events occurring as a result of the addition of elevated levels of calcium both in vitro and in vivo. Calcium may play a key role in the pathogenesis of chronic wounds.
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Affiliation(s)
- A Sank
- Laboratory of Developmental Biology and Anomalies, National Institutes of Health, Bethesda, Md. 20892
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Natowicz M, Hallett DW, Frier C, Chi M, Schlesinger PH, Baenziger JU. Recognition and receptor-mediated uptake of phosphorylated high mannose-type oligosaccharides by cultured human fibroblasts. J Cell Biol 1983; 96:915-9. [PMID: 6300141 PMCID: PMC2112397 DOI: 10.1083/jcb.96.3.915] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The intracellular transport of newly synthesized lysosomal hydrolases to lysosomes requires the presence of one or more phosphorylated high mannose-type oligosaccharides per enzyme. A receptor that mediates mannose-6-PO4-specific uptake of lysosomal enzymes is expressed on the surface of fibroblasts and presumably accounts for the intracellular transport of newly synthesized enzymes to the lysosome. In this study, we examined the internalization of lysosomal enzyme-derived phosphorylated oligosaccharides by cultured human fibroblasts. Oligosaccharides of known specific activity bearing a single phosphate in monoester linkage were internalized with Kuptake of 3.2 X 10(-7) M, whereas oligosaccharides bearing two phosphates in monoester linkage were internalized with a Kuptake of 3.9 X 10(-8) M. Thus, phosphorylated high mannose-type oligosaccharides appear to be the minimal structure required for recognition and uptake by the fibroblast receptor. The finding that the Kuptake for monophosphorylated oligosaccharides is 100-fold less than the reported Ki for mannose-6-phosphate indicates that the fibroblast phosphomannosyl receptor contains a binding site that recognizes features of the oligosaccharide in addition to mannose-6-phosphate.
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Chi M, Irwin L. Elastic deformations in strips with holes loaded through pins. J Res Natl Bur Stand (1977) 1959. [DOI: 10.6028/jres.062.026] [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: 11/04/2022] Open
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