1
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Kaniga K, Lounis N, Zhuo S, Bakare N, Andries K. Impact of Rv0678 mutations on patients with drug-resistant TB treated with bedaquiline. Int J Tuberc Lung Dis 2022; 26:571-573. [PMID: 35650698 PMCID: PMC9165736 DOI: 10.5588/ijtld.21.0670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- K Kaniga
- Johnson & Johnson Global Public Health, Titusville, NJ, USA
| | - N Lounis
- Janssen Pharmaceutica, Beerse, Belgium
| | - S Zhuo
- Janssen Research & Development, Titusville, NJ, USA, IQVIA, Durham, NC, USA
| | - N Bakare
- Janssen Research & Development, Titusville, NJ, USA
| | - K Andries
- Janssen Pharmaceutica, Beerse, Belgium
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2
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Yang Y, Wang C, Shu Q, Xu N, Qi S, Zhuo S, Zhu C, Du J. Facile one-step fabrication of Cu-doped carbon dots as a dual-selective biosensor for detection of pyrophosphate ions and measurement of pH. Spectrochim Acta A Mol Biomol Spectrosc 2022; 268:120681. [PMID: 34894564 DOI: 10.1016/j.saa.2021.120681] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 11/19/2021] [Accepted: 11/26/2021] [Indexed: 06/14/2023]
Abstract
High-performance determination of pyrophosphate ions (PPi) and pH is an important goal in biological systems. In this work, Cu-doped carbon dots (Cu-CDs) were synthesized rapidly and simply via a one-pot hydrothermal method. The as-obtained Cu-CDs, with an average size of 2.55 nm, exhibit an excitation-independent fluorescence emission and possess desirable functional groups of carboxyl and amine, which can be served as fluorescence nanoprobes for detection of PPi based on surface passivation. Under the optimal condition, the linear range for detection of PPi was 0.05-20 µM, and the corresponding limit of detection (LOD) was 0.013 µM, indicative of a promising assay for the PPi. Moreover, the fluorescent intensity of the Cu-CDs is linear against pH value from 6 to 8.7 in buffer solution, suggesting the feasibility as a pH sensor. The synthesized Cu-CDs coated fluorescent paper indeed can monitor pH in urine with satisfaction by naked eyes through ultraviolet irradiation. The successful detection of PPi and the visual detection of pH value suggest a highly promising application of Cu-CDs in the field of biosensing.
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Affiliation(s)
- Ying Yang
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Chaofeng Wang
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Qin Shu
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Na Xu
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Shuangqing Qi
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Shujuan Zhuo
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Changqing Zhu
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Jinyan Du
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
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3
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Moodliar R, Aksenova V, Frias MVG, van de Logt J, Rossenu S, Birmingham E, Zhuo S, Mao G, Lounis N, Kambili C, Bakare N. Bedaquiline for multidrug-resistant TB in paediatric patients. Int J Tuberc Lung Dis 2021; 25:716-724. [PMID: 34802493 PMCID: PMC8412106 DOI: 10.5588/ijtld.21.0022] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND: TMC207-C211 (NCT02354014) is a Phase 2, open-label, multicentre, single-arm study to evaluate pharmacokinetics, safety/tolerability, antimycobacterial activity and dose selection of bedaquiline (BDQ) in children (birth to <18 years) with multidrug-resistant-TB (MDR-TB). METHODS: Patients received 24 weeks’ BDQ with an anti-MDR-TB background regimen (BR), followed by 96 weeks of safety follow-up. Results of the primary analysis are presented based on data up to 24 weeks for Cohort 1 (≥12–<18 years; approved adult tablet at the adult dosage) and Cohort 2 (≥5–<12 years; age-appropriate 20 mg tablet at half the adult dosage). RESULTS: Both cohorts had 15 patients, of whom respectively 53% and 40% of Cohort 1 and Cohort 2 children had confirmed/probable pulmonary MDR-TB. Most patients completed 24 weeks’ BDQ/BR treatment (Cohort 1: 93%; Cohort 2: 67%). Geometric mean BDQ area under the curve 168h values of 119,000 ng.h/mL (Cohort 1) and 118,000 ng.h/mL (Cohort 2) at Week 12 were within 60–140% (86,200–201,000 ng.h/mL) of adult target values. Few adverse event (AE) related discontinuations or serious AEs, andnoQTcF >460 ms during BDQ/BR treatment or deaths occurred. Of MGIT-evaluable patients, 6/8 (75%) Cohort 1 and 3/3 (100%) Cohort 2 culture converted. CONCLUSION: In children and adolescents aged ≥5–<18 years with MDR-TB, including pre-extensively drug-resistant-TB (pre-XDR-TB) or XDR-TB, 24 weeks of BDQ provided a comparable pharmacokinetic and safety profile to adults.
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Affiliation(s)
- R Moodliar
- Tuberculosis and HIV Investigative Network, King Dinuzulu Hospital, Sydenham, Durban, South Africa
| | - V Aksenova
- National Medical Research Center for Phthisiopulmonology and Infectious Diseases, Moscow, Russian Federation
| | - M V G Frias
- De La Salle Health Sciences Institute, Dasmariñas City, Cavite, the Philippines
| | - J van de Logt
- Janssen Research & Development, Leiden, The Netherlands
| | - S Rossenu
- Janssen Pharmaceutica, Beerse, Belgium
| | | | - S Zhuo
- Janssen Research & Development, Titusville, NJ, IQVIA, NC
| | - G Mao
- Janssen Research & Development, Titusville, NJ
| | - N Lounis
- Janssen Pharmaceutica, Beerse, Belgium
| | - C Kambili
- Johnson & Johnson Global Public Health, New Brunswick, NJ, USA
| | - N Bakare
- Janssen Research & Development, Titusville, NJ
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4
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Du J, Qi S, Fan T, Yang Y, Wang C, Shu Q, Zhuo S, Zhu C. Nitrogen and copper-doped carbon quantum dots with intrinsic peroxidase-like activity for double-signal detection of phenol. Analyst 2021; 146:4280-4289. [PMID: 34105526 DOI: 10.1039/d1an00796c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, a simple and facile one-step hydrothermal carbonization synthesis procedure for the fabrication of N, Cu-doped carbon quantum dots (N, Cu-CQDs) as a peroxidase-mimicking enzyme was reported. The peroxidase-like performance of N, Cu-CQDs was assessed based on the oxidative coupling reaction of phenol with 4-aminoantipyrine (4-AAP) in the presence of hydrogen peroxide (H2O2). The N, Cu-CQDs/4-AAP/H2O2 system was applied to sensing phenol based on double signals of absorption spectra (or colorimetric visualization) as well as fluorescence spectra. The obtained limits of detection (LODs) were as low as 0.12 μM and 0.02 μM, respectively. Moreover, the proposed method was successfully applied to the determination of phenol in sewage with satisfactory recovery. Our results demonstrate that the N, Cu-CQDs/4-AAP/H2O2/phenol sensing system has a great potential prospect for applications in environmental chemistry and biotechnology.
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Affiliation(s)
- Jinyan Du
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P R China.
| | - Shuangqing Qi
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P R China.
| | - Tingting Fan
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P R China.
| | - Ying Yang
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P R China.
| | - Chaofeng Wang
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P R China.
| | - Qin Shu
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P R China.
| | - Shujuan Zhuo
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P R China.
| | - Changqing Zhu
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, P R China.
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5
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Du J, Yang Y, Shao T, Qi S, Zhang P, Zhuo S, Zhu C. Yellow emission carbon dots for highly selective and sensitive OFF-ON sensing of ferric and pyrophosphate ions in living cells. J Colloid Interface Sci 2020; 587:376-384. [PMID: 33360907 DOI: 10.1016/j.jcis.2020.11.108] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 11/08/2020] [Accepted: 11/26/2020] [Indexed: 12/14/2022]
Abstract
A simple "OFF-ON" fluorescent system was proposed for selective and sensitive detection of ferric ion (Fe3+) and pyrophosphate (PPi) in living cells. The method was constructed based on the bright yellow emission of carbon dots (y-CDs), which were prepared using o-phenylenediamine (OPD) as the precursor via a facile hydrothermal treatment. The as-obtained y-CDs, with an average size of 2.6 nm, exhibited an excitation-independent emission peak at 574 nm. The fluorescence of y-CDs can be remarkably quenched by Fe3+ with high selectivity and sensitivity. Interestingly, the quenched fluorescence can be recovered regularly upon addition of PPi, showing a promising detection for PPi. The linear ranges for Fe3+ and PPi detections were 0.05-80 and 0.5-120 μM, respectively, and the corresponding limit of detections (LODs) were 22.1 and 73.9 nM. As we proved the y-CDs have negligible cytotoxicity and excellent biocompatibility, further application to the fluorescence imaging of intracellular Fe3+ and PPi were conducted, suggesting the prepared y-CDs can be used to monitor Fe3+ and PPi variation in living cells. Overall, our developed y-CDs-based OFF-ON switch fluorescent probe has the advantages of simplicity, agility, high sensitivity and selectivity, which provides a promising platform for environmental and biology applications, and paves a new avenue for monitoring the hydrolysis process of adenosine triphosphate disodium salt (ATP) by detection of PPi in organisms.
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Affiliation(s)
- Jinyan Du
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China.
| | - Ying Yang
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
| | - Taili Shao
- Anhui Provincial Engineering Research Center for Polysaccharide Drugs, School of Pharmacy, Wannan Medical College, Wuhu 241000, PR China.
| | - Shuangqing Qi
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
| | - Ping Zhang
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
| | - Shujuan Zhuo
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
| | - Changqing Zhu
- Anhui Key Laboratory of Chemo-Biosensing, Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
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6
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Du J, Qi S, Chen J, Yang Y, Fan T, Zhang P, Zhuo S, Zhu C. Fabrication of highly active phosphatase-like fluorescent cerium-doped carbon dots for in situ monitoring the hydrolysis of phosphate diesters. RSC Adv 2020; 10:41551-41559. [PMID: 35516543 PMCID: PMC9057792 DOI: 10.1039/d0ra07429b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 08/29/2020] [Accepted: 11/07/2020] [Indexed: 12/13/2022] Open
Abstract
The hydrolytic cleavage of BNPP was catalyzed and monitored by the fluorescent CeCDs.
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Affiliation(s)
- Jinyan Du
- Anhui Key Laboratory of Chemo-Biosensing
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Shuangqing Qi
- Anhui Key Laboratory of Chemo-Biosensing
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Juan Chen
- Anhui Key Laboratory of Chemo-Biosensing
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Ying Yang
- Anhui Key Laboratory of Chemo-Biosensing
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Tingting Fan
- Anhui Key Laboratory of Chemo-Biosensing
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Ping Zhang
- Anhui Key Laboratory of Chemo-Biosensing
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Shujuan Zhuo
- Anhui Key Laboratory of Chemo-Biosensing
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Changqing Zhu
- Anhui Key Laboratory of Chemo-Biosensing
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- College of Chemistry and Materials Science
- Anhui Normal University
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7
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Zhuo S, Fang J, Li M, Wang J, Zhu C, Du J. Manganese(II)-doped carbon dots as effective oxidase mimics for sensitive colorimetric determination of ascorbic acid. Mikrochim Acta 2019; 186:745. [DOI: 10.1007/s00604-019-3887-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Accepted: 09/30/2019] [Indexed: 02/06/2023]
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8
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Zhuo S, Guan Y, Li H, Fang J, Zhang P, Du J, Zhu C. Facile fabrication of fluorescent Fe-doped carbon quantum dots for dopamine sensing and bioimaging application. Analyst 2019; 144:656-662. [DOI: 10.1039/c8an01741g] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile Fe-doped carbon quantum dot based fluorescent sensor for dopamine sensing and bioimaging was constructed.
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Affiliation(s)
- Shujuan Zhuo
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Yuanyuan Guan
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Hui Li
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Jing Fang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Ping Zhang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Jinyan Du
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Changqing Zhu
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
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9
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Zhuo S, Gao L, Zhang P, Du J, Zhu C. Living cell imaging and sensing of hydrogen sulfide using high-efficiency fluorescent Cu-doped carbon quantum dots. NEW J CHEM 2018. [DOI: 10.1039/c8nj03654c] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple Cu-doped carbon quantum dot-based fluorescent sensor for H2S sensing and intracellular bioimaging was constructed.
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Affiliation(s)
- Shujuan Zhuo
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Lingling Gao
- Anhui Xuancheng Product Quality Supervision and Inspection Institute
- Xuancheng
- P. R. China
| | - Ping Zhang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Jinyan Du
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Changqing Zhu
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
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10
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Chen Y, Du W, Shen G, Zhuo S, Zhu X, Shen H, Huang Y, Su S, Lin N, Pei L, Zheng X, Wu J, Duan Y, Wang X, Liu W, Wong M, Tao S. Household air pollution and personal exposure to nitrated and oxygenated polycyclic aromatics (PAHs) in rural households: Influence of household cooking energies. Indoor Air 2017; 27:169-178. [PMID: 27008622 DOI: 10.1111/ina.12300] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 03/15/2016] [Indexed: 05/22/2023]
Abstract
Residential solid fuels are widely consumed in rural China, contributing to severe household air pollution for many products of incomplete combustion, such as polycyclic aromatic hydrocarbons (PAHs) and their polar derivatives. In this study, concentrations of nitrated and oxygenated PAH derivatives (nPAHs and oPAHs) for household and personal air were measured and analyzed for influencing factors like smoking and cooking energy type. Concentrations of nPAHs and oPAHs in kitchens were higher than those in living rooms and in outdoor air. Exposure levels measured by personal samplers were lower than levels in indoor air, but higher than outdoor air levels. With increasing molecular weight, individual compounds tended to be more commonly partitioned to particulate matter (PM); moreover, higher molecular weight nPAHs and oPAHs were preferentially found in finer particles, suggesting a potential for increased health risks. Smoking behavior raised the concentrations of nPAHs and oPAHs in personal air significantly. People who cooked food also had higher personal exposures. Cooking and smoking have a significant interaction effect on personal exposure. Concentrations in kitchens and personal exposure to nPAHs and oPAHs for households using wood and peat were significantly higher than for those using electricity and liquid petroleum gas (LPG).
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Affiliation(s)
- Y Chen
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - W Du
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - G Shen
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - S Zhuo
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - X Zhu
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - H Shen
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - Y Huang
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - S Su
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - N Lin
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - L Pei
- Institute of Population Research, Peking University, Beijing, China
| | - X Zheng
- Institute of Population Research, Peking University, Beijing, China
| | - J Wu
- Institute of Population Research, Peking University, Beijing, China
| | - Y Duan
- College of Resources and Environment, Shanxi Agricultural University, Shanxi, China
| | - X Wang
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - W Liu
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
| | - M Wong
- Consortium on Health, Environment, Education and Research (CHEER), Department of Science and Environmental Studies, Hong Kong Institute of Education, Hong Kong, China
| | - S Tao
- Laboratory of Earth Surface Processes, College of Urban and Environmental Science, Peking University, Beijing, China
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11
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Zhuo S, Gong J, Zhang P, Zhu C. High-throughput and rapid fluorescent visualization sensor of urinary citrate by CdTe quantum dots. Talanta 2015; 141:21-5. [PMID: 25966375 DOI: 10.1016/j.talanta.2015.03.054] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 03/21/2015] [Accepted: 03/25/2015] [Indexed: 12/20/2022]
Abstract
In this paper, we have presented a novel CdTe quantum dots (QDs) based fluorescent sensor for visual and turn-on sensing of citrate in human urine samples. The europium ion (Eu(3+)) can lead to the fluorescence quenching of thioglycollic acid (TGA) modified CdTe QDs due to photoinduced electron transfer accompanied by the change of emission color from yellow to orange. Next, addition of citrate breaks the preformed assembly because citrate can replace the CdTe QDs, based on the fact that the Eu(3+) ion displays higher affinity with citrate than the CdTe QDs. Thus the photoinduced electron transfer is switched off, and the fluorescence emission of CdTe QDs is rapidly (within 5min) recovered, simultaneously, the orange emission color restores to yellow. Such proposed strategy may conveniently discriminate the patient of renal stone from normal person by naked eyes. In addition to visualization detection, the fluorescence responses can be used for well quantifying citrate in the range of 0.67-133μM. So, the present, simple, low-cost and visualized citrate fluorescence sensor has great potential in the applications for earlier screening in clinical detection.
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Affiliation(s)
- Shujuan Zhuo
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
| | - Jiajia Gong
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Ping Zhang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Changqing Zhu
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
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12
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Zhang P, Zhuo S, Sun L, Zhang P, Zhu C. Determination of gamma-globulin at nanogram levels by its quenching effect on the fluorescence of a red emitting conjugated polymer. NEW J CHEM 2015. [DOI: 10.1039/c5nj00286a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A novel red emitting fluorescence sensor has been constructed and used for the selective assay of gamma-globulin in the presence of serum albumin.
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Affiliation(s)
- Ping Zhang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Shujuan Zhuo
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Lilin Sun
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Ping Zhang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Changqing Zhu
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
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13
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Abstract
A well-designed turn-on sensor has been constructed and used for the assay of oxytetracycline hydrochloride in real milk samples.
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Affiliation(s)
- Xuting An
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Shujuan Zhuo
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Ping Zhang
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Changqing Zhu
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
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Wang B, Zhuo S, Chen L, Zhang Y. Fluorescent graphene quantum dot nanoprobes for the sensitive and selective detection of mercury ions. Spectrochim Acta A Mol Biomol Spectrosc 2014; 131:384-387. [PMID: 24840485 DOI: 10.1016/j.saa.2014.04.129] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 02/17/2014] [Accepted: 04/21/2014] [Indexed: 06/03/2023]
Abstract
Graphene quantum dots were prepared by ultrasonic route and served as a highly selective water-soluble probe for sensing of Hg(2+). The fluorescence emission spectrum of graphene quantum dots was at about 430nm. In the presence of Hg(2+), the fluorescence of the quantum dots significantly quenched. And the fluorescence intensity gradually decreased with the increasing concentration of Hg(2+). The change of fluorescence intensity is directly proportional to the concentration of Hg(2+). Under optimum conditions, the linear range for the detection of Hg(2+) was 8.0×10(-7) to 9×10(-6)M with a detection limit of 1.0×10(-7)M. In addition, the preliminary mechanism of fluorescence quenching was discussed in the paper. The constructed sensor with high sensitivity and selectivity, simple, rapid properties makes it valuable for further application.
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Affiliation(s)
- Baojuan Wang
- College of Life Sciences, Anhui Normal University, Wuhu 241000, People's Republic of China
| | - Shujuan Zhuo
- The Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, People's Republic of China.
| | - Luyang Chen
- The Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, People's Republic of China
| | - Yongjun Zhang
- The Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, People's Republic of China
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Du J, Dong X, Zhuo S, Shen W, Sun L, Zhu C. Eu(III)-induced room-temperature fast transformation of CdTe nanocrystals into nanorods. Talanta 2014; 122:229-33. [PMID: 24720988 DOI: 10.1016/j.talanta.2014.01.042] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 01/12/2014] [Accepted: 01/13/2014] [Indexed: 10/25/2022]
Abstract
A fast and mild synthesis method of highly crystalline CdTe nanorods (NRs) was developed by adding europium nitrate hexahydrate to an aqueous solution of CdTe nanocrystals (NCs) at room temperature within 30 min. It was suggested that strong coordination strength of Eu(III) decreases zeta potential, thereby accelerates aggregation of NCs, and favors the transformation process from NCs to NRs. The oriented attachment of aggregated particles was suggested as a major path for the formation of highly crystalline NRs under experimental conditions. The proposed extremely fast room-temperature methodology opens up novel pathways for the synthesis of one-dimensional (1D) semiconductor nanostructures with high crystallinity, which would become potential candidates for many practical applications such as photovoltaics, circuit design and fabrication of functional architectures.
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Affiliation(s)
- Jinyan Du
- Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Xiawei Dong
- Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Shujuan Zhuo
- Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Weili Shen
- Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Lilin Sun
- Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China
| | - Changqing Zhu
- Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
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Du J, Ye L, Ding M, Chen Y, Zhuo S, Zhu C. Label-free fluorescence polarization detection of pyrophosphate based on 0D/1D fast transformation of CdTe nanostructures. Analyst 2014; 139:3541-7. [DOI: 10.1039/c4an00266k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and label-free fluorescence polarization method for detecting PPi is constructed based on 0D/1D fast transformation of CdTe nanostructures
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Affiliation(s)
- Jinyan Du
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Li Ye
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Meili Ding
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Yuting Chen
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Shujuan Zhuo
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
| | - Changqing Zhu
- Key Laboratory of Functional Molecular Solids
- Ministry of Education
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
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17
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Shao T, Wang G, An X, Zhuo S, Xia Y, Zhu C. A reformative oxidation strategy using high concentration nitric acid for enhancing the emission performance of graphene quantum dots. RSC Adv 2014. [DOI: 10.1039/c4ra06935h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Red fluorescent graphene quantum dots with 18% quantum yield at 600 nm were obtained through a concentrated HNO3oxidation strategy.
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Affiliation(s)
- Taili Shao
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
- Wuhu 241000, People's Republic of China
- School of Pharmacy
| | - Guodong Wang
- School of Pharmacy
- Wannan Medical College
- Wuhu 241002, People's Republic of China
| | - Xuting An
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
- Wuhu 241000, People's Republic of China
| | - Shujuan Zhuo
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
- Wuhu 241000, People's Republic of China
| | - Yunsheng Xia
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
- Wuhu 241000, People's Republic of China
| | - Changqing Zhu
- Anhui Key Laboratory of Chemo-Biosensing
- College of Chemistry and Materials Science
- Anhui Normal University
- Wuhu 241000, People's Republic of China
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Zhu X, Tang Y, Chen J, Xiong S, Zhuo S, Chen J. Monitoring wound healing of elastic cartilage using multiphoton microscopy. Osteoarthritis Cartilage 2013; 21:1799-806. [PMID: 23973917 DOI: 10.1016/j.joca.2013.08.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 08/06/2013] [Accepted: 08/12/2013] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To demonstrate the ability of multiphoton microscopy (MPM) for monitoring wound healing of elastic cartilage. METHOD In a rabbit ear model, four cartilage specimen groups at 1-day, 1-, 4-, 20-week healing time points as well as a normal elastic cartilage were examined with MPM without using labeling agents. MPM images at wound margins were obtained from specimens at different healing stages, compared with the Hematoxylin and Eosin (H&E) stained images. Image analysis was performed to characterize the collagen morphology for quantifying the wound healing progression of elastic cartilage. RESULTS MPM provided high-resolution images of elastic cartilage at varying depths. Comparisons of the images of specimens at different healing stages show obvious cell growth and matrix deposition. The results are consistent with the histological results. Moreover, quantitative analysis results show significant alteration in the collagen cavity size or collagen orientation index during wound healing of elastic cartilage, indicating the possibility to act as indicators for monitoring wound healing. CONCLUSION Our results suggested that MPM has the ability to monitor the wound healing progression of elastic cartilage, based on the visualization of cell growth and proliferation and quantitative characterization of collagen morphology during wound healing.
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Affiliation(s)
- X Zhu
- Institute of Laser and Optoelectronics Technology, Fujian Provincial Key Laboratory for Photonics Technology, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou 350007, PR China.
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Zhuo S, Shao M, Lee ST. Upconversion and downconversion fluorescent graphene quantum dots: ultrasonic preparation and photocatalysis. ACS Nano 2012; 6:1059-64. [PMID: 22221037 DOI: 10.1021/nn2040395] [Citation(s) in RCA: 477] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconverted emission is presented. The as-prepared GQDs exhibit an excitation-independent downconversion and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutile TiO(2)/GQD and anatase TiO(2)/GQD systems) were designed to harness the visible spectrum of sunlight. It is interesting that the photocatalytic rate of the rutile TiO(2)/GQD complex system is ca. 9 times larger than that of the anatase TiO(2)/GQD complex under visible light (λ > 420 nm) irradiation in the degradation of methylene blue.
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Affiliation(s)
- Shujuan Zhuo
- Institute of Functional Nano & Soft Materials (FUNSOM) and Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
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Chen T, Shao M, Xu H, Zhuo S, Liu S, Lee ST. Molecularly imprinted polymer-coated silicon nanowires for protein specific recognition and fast separation. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm14329a] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [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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Chen G, Chen J, Zhuo S, Xiong S, Zeng H, Jiang X, Chen R, Xie S. Nonlinear spectral imaging of human hypertrophic scar based on two-photon excited fluorescence and second-harmonic generation. Br J Dermatol 2009; 161:48-55. [PMID: 19309369 DOI: 10.1111/j.1365-2133.2009.09094.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND A noninvasive method using microscopy and spectroscopy for analysing the morphology of collagen and elastin and their biochemical variations in skin tissue will enable better understanding of the pathophysiology of hypertrophic scars and facilitate improved clinical management and treatment of this disease. OBJECTIVE To obtain simultaneously microscopic images and spectra of collagen and elastin fibres in ex vivo skin tissues (normal skin and hypertrophic scar) using a nonlinear spectral imaging method, and to compare the morphological structure and spectral characteristics of collagen and elastin fibres in hypertrophic scar tissues with those of normal skin, to determine whether this approach has potential for in vivo assessment of the pathophysiology of human hypertrophic scars and for monitoring treatment responses as well as for tracking the process of development of hypertrophic scars in clinic. METHODS Ex vivo human skin specimens obtained from six patients aged from 10 to 50 years old who were undergoing skin plastic surgery were examined. Five patients had hypertrophic scar lesions and one patient had no scar lesion before we obtained his skin specimen. A total of 30 tissue section samples of 30 mum thickness were analysed by the use of a nonlinear spectral imaging system consisting of a femtosecond excitation light source, a high-throughput scanning inverted microscope, and a spectral imaging detection system. The high-contrast and high-resolution second harmonic generation (SHG) images of collagen and two-photon excited fluorescence (TPEF) images of elastin fibres in hypertrophic scar tissues and normal skin were acquired using the extracting channel tool of the system. The emission spectra were analysed using the image-guided spectral analysis method. The depth-dependent decay constant of the SHG signal and the image texture characteristics of hypertrophic scar tissue and normal skin were used to quantitatively assess the amount, distribution and orientation of their collagen and elastin components. RESULTS Our experiments and data analyses demonstrated apparent differences between hypertrophic scar tissue and normal skin in terms of their morphological structure and the spectral characteristics of collagen and elastin fibres. These differences can potentially be used to distinguish hypertrophic scar tissues from normal skin and to evaluate treatment responses. CONCLUSIONS All the measurements were performed in backscattering geometry and demonstrated that nonlinear spectral imaging has the ability to differentiate hypertrophic scar tissue from normal skin based on noninvasive SHG imaging, and TPEF imaging revealed the microstructure and spectral features of collagen and elastin fibres. With the advances in spectral imaging apparatus miniaturization, we have good reason to believe that this approach can become a valuable tool for the in vivo pathophysiology study of human skin hypertrophic scars and for assessing the treatment responses of this disfiguring disease in clinic. It can also be used to track the development of hypertrophic scars and to study wound healing processes in a noninvasive fashion without biopsy, fixation, sectioning and the use of exogenous dyes or stains.
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Affiliation(s)
- G Chen
- Key Laboratory of Optoelectronic Science and Technology for Medicine Fujian Normal University, Ministry of Education, and Fujian Provincial Key Laboratory of Photonic Technology, Fuzhou 350007, China
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Wu Y, Zheng H, Chen J, Zhuo S, Wang L, Li Y, Zhu C. Spectrophotometric Method for the Direct Determination of Anionic Surfactant Sodium Dodecyl Benzenesulfonate (SDBS) Using a Hydrophobic Near‐Infrared (NIR) Cationic Cyanine Dye Without Solvent Extraction. ANAL LETT 2007. [DOI: 10.1081/al-120029747] [Citation(s) in RCA: 4] [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: 11/03/2022]
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Papkoff J, Strelow A, Lee S, Nguyen A, Diedrich G, Zhuo S, Liu W. 204 POSTER Discovery and validation of a promising new target for therapeutic monoclonal antibodies: a type II transmembrane serine protease overexpressed in human ovarian and pancreatic cancers. EJC Suppl 2006. [DOI: 10.1016/s1359-6349(06)70209-9] [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: 10/23/2022] Open
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Fang F, Zheng H, Li L, Wu Y, Chen J, Zhuo S, Zhu C. Determination of nucleic acids with a near infrared cyanine dye using resonance light scattering technique. Spectrochim Acta A Mol Biomol Spectrosc 2006; 64:698-702. [PMID: 16650797 DOI: 10.1016/j.saa.2005.07.071] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Received: 07/01/2005] [Accepted: 07/25/2005] [Indexed: 05/08/2023]
Abstract
A new method for the determination of nucleic acids has been developed based on the enhancement effect of resonance light scattering (RLS) with a cationic near infrared (NIR) cyanine dye. Under the optimal conditions, the enhanced RLS intensity at 823 nm is proportional to the concentration of nucleic acids in the range of 0-400 ng mL-1 for both calf thymus DNA (CT DNA) and fish sperm DNA (FS DNA), 0-600 ng mL-1 for snake ovum RNA (SO RNA). The detection limits are 3.5 ng mL-1, 3.4 ng mL-1 and 2.9 ng mL-1 for CT DNA, FS DNA and SO RNA, respectively. Owing to performing in near infrared region, this method not only has high sensitivity endowed by RLS technique but also avoids possible spectral interference from background. It has been applied to the determination of nucleic acids in synthetic and real samples and satisfactory results were obtained.
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Affiliation(s)
- Fang Fang
- Anhui Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China
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Zhu C, Zhuo S, Zheng H, Chen J, Li D, Li S, Xu J. Determination of nucleic acids based on shifting the association equilibrium between tetracarboxy aluminum phthalocyanine and poly-lysine. Spectrochim Acta A Mol Biomol Spectrosc 2005; 61:743-748. [PMID: 15649809 DOI: 10.1016/j.saa.2004.05.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2004] [Accepted: 05/18/2004] [Indexed: 05/24/2023]
Abstract
A new method based on near-infrared (near-IR) fluorescence recovery was presented for the determination of nucleic acids. This method employed a two-reagent system composed of anionic tetracarboxy aluminum phthalocyanine (AlC4Pc) and polycationic poly-lysine. The fluorescence of AlC4Pc, with the maximum excitation and emission wavelengths at 620 and 701 nm, respectively, was quenched by poly-lysine with a proper concentration, but recovered by adding nucleic acids. Under optimal conditions, the recovered fluorescence was in proportional to the concentration of nucleic acids. The linear ranges of the calibration curves were 5-200 ng mL(-1) for both calf thymus DNA (ctDNA) and fish sperm DNA (fsDNA) with the detection limit of 2.6 ng mL(-1) for ctDNA and 2.1 ng mL(-1) for fsDNA. The relative standard deviation (n = 6) was 1.9 and 1.3% for 50 ng mL(-1) ctDNA and fsDNA, respectively. The proposed method was applied to the determination of nucleic acids in synthetic samples with satisfactory results.
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Affiliation(s)
- Changqing Zhu
- The Key Laboratory of Analytical Science of MOE, Department of Chemistry, Xiamen University, Xiamen 361005, China
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Papkoff J, Liu W, Tang T, Munteanu A, Zhuo S, Liu Y, Salceda S, Macina R, Pilkington G, Corral L. 301 Genomic discovery, characterization and validation of a transmembrane protein overexpressed in human ovarian and pancreatic cancers: a promising new target for therapeutic monoclonal antibodies. EJC Suppl 2004. [DOI: 10.1016/s1359-6349(04)80309-4] [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: 10/26/2022] Open
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Li Y, Chen J, Zhu C, Wang L, Zhao D, Zhuo S, Wu Y. Preparation and application of cysteine-capped ZnS nanoparticles as fluorescence probe in the determination of nucleic acids. Spectrochim Acta A Mol Biomol Spectrosc 2004; 60:1719-1724. [PMID: 15248943 DOI: 10.1016/j.saa.2003.09.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2003] [Revised: 09/13/2003] [Accepted: 09/17/2003] [Indexed: 05/24/2023]
Abstract
Cysteine-capped ZnS nanometer-sized fluorescent particles were produced by a colloidal aqueous synthesis. The functionalized nanoparticles are water-soluble and suitable for biological application. A synchronous fluorescence method has been developed for the rapid determination of DNA with functionalized nano-ZnS as a fluorescence probe, based on the synchronous fluorescence enhancement of cysteine-capped nano-ZnS in the presence of DNA. When Deltalambda =190 nm, maximum synchronous fluorescence is produced at 267 nm at pH 5.12. Under optimum conditions, the synchronous fluorescence intensity is proportional to the concentration of nucleic acids in the range 0.1-1.2 microg ml(-1) for calf thymus DNA, 0.1-0.6 microg ml(-1) for fish sperm DNA. The corresponding detection limit is 32.9 ng ml(-1) for calf thymus DNA and 24.6 ng ml(-1) for fish sperm DNA. This method is simple, inexpensive, rapid and sensitive. The recovery and relative standard deviation are satisfactory.
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Affiliation(s)
- Yongxin Li
- College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China.
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Zhu C, Zhuo S, Li Y, Wang L, Zhao D, Chen J, Wu Y. Determination of nucleic acids with tetra-(N-hexadecylpyridiniumyl) porphyrin sensitized by cetyltrimethylammonium bromide (CTMAB) using a Rayleigh light-scattering technique. Spectrochim Acta A Mol Biomol Spectrosc 2004; 60:959-964. [PMID: 15036109 DOI: 10.1016/s1386-1425(03)00325-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2003] [Accepted: 07/11/2003] [Indexed: 05/24/2023]
Abstract
Using a common spectrofluorometer to measure the intensity of Rayleigh light-scattering (RLS), a method for determination of nucleic acids has been developed. At pH 10.24 and ionic strength 0.01 mol l-1 (NaCl), the Rayleigh light-scattering of the tetra-(N-hexadecylpyridiniumyl) porphyrin (TC16PyP) is greatly enhanced by nucleic acids in the presence of cetyltrimethylammonium bromide (CTMAB), with the scattering peak located at 311.8 nm. The enhanced RLS intensity is in proportion to the concentration of calf thymus DNA (ctDNA) in the range 0.2-6.0 microg ml-1 and to that of fish sperm DNA (fsDNA) in the range 0.05-3.0microg ml-1. The limits of detection are 0.016 microg ml-1 for calf thymus DNA and 0.023 microg ml-1 for fish sperm DNA when the concentration of TPP was chosen 2.0 x 10(-6) mol l-1. Four synthetic samples were determined satisfactorily.
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Affiliation(s)
- Changqing Zhu
- College of Chemistry and Materials Science, Anhui Normal Unversity, Wuhu 241000, PR China.
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Sun B, Harrowe G, Reinhard C, Yoshihara C, Chu K, Zhuo S. Modulation of human cytomegalovirus immediate-early gene enhancer by mitogen-activated protein kinase kinase kinase-1. J Cell Biochem 2002; 83:563-73. [PMID: 11746500 DOI: 10.1002/jcb.1251] [Citation(s) in RCA: 14] [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: 11/07/2022]
Abstract
The immediate-early (IE) promoter of human cytomegalovirus (HCMV) constitutes a primary genetic switch, which determines the progression of viral infection. Earlier reports by others have shown mitogen-activated protein kinase kinase kinase-1 (MEKK1) to be able to up-regulate HCMV-IE promoter through downstream mitogen-activated protein kinase (MAPK) pathways. However, we noticed that the activation of the HCMV-IE promoter by constitutively active MEKK1 (MEKK1-TRU) might not be through the MAPK pathways. Using a HCMV-IE enhancer/promoter (- 522 to + 72) driving a luciferase reporter, we demonstrated that the downstream MAPK activation actually repressed the up-regulation of the promoter by MEKK1 in CHO-K1 and human 293 cells. We further found that the up-regulation of HCMV-IE promoter by MEKK1 could be in great extent suppressed by over-expression of IkappaBalpha. Deletion of the NFkappaB/rel sites in the HCMV-IE enhancer region by mutagenesis proportionally reduced the transcriptional activation by MEKK1-TRU, whereas deletion of the ATF/CREB binding sites or cyclic AMP response elements (CRE) had no effects. Furthermore, the NFkappaB/rel deletion mutant also showed repression on the basic transcription activity of the HCMV-IE promoter. Our results indicate that the NFkappaB/rel sites are not only responsible for the modulation of HCMV-IE enhancer activity by MEKK1 but also control the basic transcription activity of the HCMV-IE promoter. On the other hand, the four consensus CRE sites were found to have no function in the activation of the promoter by MEKK1.
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Affiliation(s)
- B Sun
- Chiron Corporation, 4560 Horton Street, Emeryville, California 94608-2916, USA
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Waltz DA, Fujita RM, Yang X, Natkin L, Zhuo S, Gerard CJ, Rosenberg S, Chapman HA. Nonproteolytic role for the urokinase receptor in cellular migration in vivo. Am J Respir Cell Mol Biol 2000; 22:316-22. [PMID: 10696068 DOI: 10.1165/ajrcmb.22.3.3713] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The urokinase receptor (uPAR) binds and localizes urokinase activity at cellular surfaces, facilitating fibrinolysis and cellular migration at sites of tissue injury. uPAR also participates in cellular signaling and regulates integrin-dependent adhesion and migration in vitro. We now report evidence that uPAR occupancy regulates cellular migration in vivo in the absence of functional urokinase. Recombinant murine KC (1.5 microg), a potent neutrophil chemoattractant, was delivered to the lungs of wild-type, urokinase-deficient or uPAR-deficient mice 18 h after intraperitoneal injection of 200 microg human immunoglobulin G (IgG) or a fusion protein composed of an amino-terminal receptor-binding fragment of urokinase and a human IgG Fc fragment (GFD-Fc). Whole lung lavage for recovery of leukocytes was performed 4 h later. KC treatment resulted in a 100-fold increase in lavage neutrophils. GFD-Fc injection resulted in >50% reduction in neutrophil influx in both wild-type and urokinase-deficient animals but had no effect on uPAR -/- mice. A concomitant reduction in alveolar protein leakage but no change in numbers of circulating neutrophils accompanied this attenuated inflammatory response. The reduction in neutrophil influx induced by GFD-Fc is thus related to uPAR occupancy and yet not due to disruption of uPAR-mediated proteolysis. These observations verify that protease-independent functions of uPAR operate in vivo and identify uPAR as a potential target for regulation of inflammatory processes characterized by neutrophil-mediated injury.
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Affiliation(s)
- D A Waltz
- Department of Medicine, Children's Hospital, Boston, Massachusetts 02115, USA.
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Tao G, Ji A, Zhuo S. [FPMULTI--a software for multi-layer composition and thickness analysis and its applications]. Guang Pu Xue Yu Guang Pu Fen Xi 1999; 19:215-218. [PMID: 15819013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Main features of FPMULTI, a software for analyzing composition and thickness of multi-layer samples simultaneously using XRF, are briefly described in this paper. Based on fundamental parameter method, the software has the capability of determining multi-layer samples containing up to 10 layers and 25 elements. Calibration standards can be bulk or multi-layer of pure element or multi-element standards. Application examples for tin-plates, hot dip galvanized zinc-plates and 'fingerprint-resistant' plates were given. FPMULTI is used to predict the relationship between intensities of different X-ray lines and the thickness first and then to analyze those samples. When using only few calibration standards, the results from FPMULTI are much better than those from linear regression method, and this reflects the advantages of the fundamental parameter approach.
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Affiliation(s)
- G Tao
- Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050 Shanghai
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Tressler RJ, Pitot PA, Stratton JR, Forrest LD, Zhuo S, Drummond RJ, Fong S, Doyle MV, Doyle LV, Min HY, Rosenberg S. Urokinase receptor antagonists: discovery and application to in vivo models of tumor growth. APMIS 1999; 107:168-73. [PMID: 10190294 DOI: 10.1111/j.1699-0463.1999.tb01540.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [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: 11/29/2022]
Abstract
Urokinase receptor antagonists based on the growth factor domains of both human and murine urokinase which show sub-nanomolar affinities for their homologous receptors have been expressed as recombinant proteins. Further modification of these molecules by preparing fusions with the constant region of human IgG has led to molecules with high affinities and long in vivo half-lives. Smaller peptidic inhibitors have been obtained by a combination of bacteriophage display and peptide analog synthesis. All of these molecules inhibit the binding of the growth factor domain of uPA to the uPA receptor and enhance binding of the uPA receptor to vitronectin. Protein uPA receptor antagonists were tested in an in vivo tumor model using the human breast carcinoma MDAmb231 in immunodeficient mice. Both human and murine receptor antagonists showed significant inhibition of primary tumor growth, demonstrating that in vivo, both tumor and stromal cell uPA receptor dependent plasminogen activation can modulate tumor growth.
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Affiliation(s)
- R J Tressler
- Chiron Corporation, Emeryville, California 94608, USA
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Zhuo S, Dixon JE. Effects of sulfhydryl regents on the activity of lambda Ser/Thr phosphoprotein phosphatase and inhibition of the enzyme by zinc ion. Protein Eng 1997; 10:1445-52. [PMID: 9543006 DOI: 10.1093/protein/10.12.1445] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Sulfhydryl reagents, such as dithiothreitol (DTT), affected the activity of Ser/Thr phosphoprotein phosphatases. Addition of DTT to the assay buffer increased the affinity of lambda Ser/Thr phosphoprotein phosphatase (lambda-PPase) for its Mn2+ cofactor. On the other hand, the enzyme was found to be inactivated simply by dilution in Tris buffer. The inactivation could be completely prevented by the presence of DTT or Mn2+ in the buffer. Further studies showed that oxidation or reduction of cysteine residues in lambda-PPase may not be the cause of the change in the enzyme activity. Without exception, mutation of all cysteine residues in lambda-PPase to serine did not convert the enzyme into a thiol-insensitive mutant. By careful examination of the effects of different sulfhydryl reagents, metal ion cofactors and substrates on lambda-PPase, it was found that the role of sulfhydryl reagents was the chelation of small amounts of inhibitory metal ions, which were present in plastic laboratory ware, such as disposable cuvets and tubes, with prevention of the enzyme from inactivation. One of the main contaminants found in plastic cuvets was Zn2+, which is a potent inhibitor of lambda-PPase. The inhibition of lambda-PPase by Zn2+ was characterized. Pre-treatment of the enzyme (1-4 nM) with 1 microM of ZnCl2 almost completely inhibited the enzymatic activity in response to 2 mM Mn2+. However, no significant inhibition was found when the enzyme was added to the assay mixture containing 1 microM Zn2+ and 2 mM Mn2+ . This confirms the sensitivity of the holoenzyme to inhibitory metal ions in vitro. The kinetic analysis indicated that the inhibitory metal ion might compete with Mn2+ to bind to the active site of lambda-PPase. This was further supported by the mutation of metal cofactor binding amino acid residues of the enzyme. Mutants which have less affinity for Mn2+ are also less sensitive to Zn2+. Our results suggest that inhibitory metal ions may induce a different structural conformation for lambda-PPase.
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Affiliation(s)
- S Zhuo
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, 48109-0606, USA
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Xiao S, Shi Z, Zhuo S, Wang C, Zhang Z, Chu B, Zhen J, Chen M. Field studies on the preventive effect of oral artemether against schistosomal infection. Chin Med J (Engl) 1996; 109:272-5. [PMID: 8758286] [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: 02/02/2023] Open
Abstract
OBJECTIVE To study the preventive effect of oral artemether (Art) against schistosomal infection in the field. METHODS In Minglang District of Yiyang City, Hunan Province, there is an islet with embankment type endemic area in the southern Dongting Lake region. From August to October 1994 the residents who frequently contacted the infested water were selected for study and allocated to the Art group and the control group. About one month before the preventive Art administration, all the residents understudied were examined by stool hatching technique, and then treated orally with praziquantel at a single dose of 40 mg/kg in stool egg-negative residents and 50 mg/kg in stool egg-positive ones. In the Art group, the first dose of 6 mg/kg was given at the end of August, followed by 3 repeated doses every 15 days. Placebo (starch) was given to the control group at the same time as in the Art group. The preventive efficacy was evaluated by stool examination 25-32 days after the last medication. RESULTS In the Art group, 20 out of 365 studied residents became stool positive with an infection rate of 5.5%, while in the control group, 51 out of 376 studied residents were stool positive with an infection rate of 13.6%. The egg count per gram of feces (EPG) determined by the Kato-Katz method was 122 +/- 79 in the Art group and 681 +/- 909 in the control group. Meanwhile, two cases of acute schistosomiasis were found in the control group, but none was observed in the Art group. No apparent adverse side effect was seen during the treatment with Art. CONCLUSION Oral Art exhibited apparent preventive effect on the residents who contacted the infested water in schistosomiasis endemic area.
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Affiliation(s)
- S Xiao
- Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai
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Abstract
The biosynthesis of 6(R)-5,6,7,8-tetrahydrobiopterin (BH4) in murine erythroleukemia (MEL) cells is almost completely inhibited by 10 mM, 2,4-diamino-6-hydroxypyrimidine (DAHP), which targets GTP cyclohydrolase. The inhibition results in dephosphorylation of the retinoblastoma gene product, prolongation of the G1-phase in the cell cycle, and subsequent commitment to terminal differentiation of MEL cells. Reversal of the processes by repletion of cellular BH4 with biopterin-related compounds including BH4, 7,8-dihydrobiopterin (7,8-BH2), sepiapterin, and 7,8-dihydroneopterin has generated complicated results. Low micromolar exogenous pterin compounds had little or no effect. At 300 microM or higher, the synthesis of hemoglobin by DAHP-induced MEL cells is significantly inhibited by 7,8-dihydrobiopterin and sepiapterin. However, further cell cycle analysis shows that the inhibition of cell differentiation by 7,8-BH2 and sepiapterin may not be due to the reversal of cell proliferation. Inhibition of BH4 biosynthesis in MEL cells by inhibitors of sepiapterin reductase has also been studied. None of the inhibitors that were tested, including N-chloroacetyl-dopamine and N-acetylserotonin, which are specific for sepiapterin reductase, can block MEL cells in G1-phase or induce the cells to commit to terminal differentiation. Furthermore, inhibitors of sepiapterin reductase are found to reduce or to abolish hemoglobin synthesis in differentiating MEL cells induced by hexamethylene bisacetamide. The mechanism for this is not clear. Not all of the effects caused by the depletion of BH4 synthesis can be rescued by repletion of BH4. These results suggest that BH4 may not regulate proliferation or differentiation of MEL cells as previously thought. Its function in MEL cells is still not clear.
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Affiliation(s)
- S Zhuo
- Laboratory of Neurochemistry, National Institute of Mental Health, National Institute of Health, Bethesda, Maryland 20892-4096, USA
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Zhuo S, Fan S, Huang S, Kaufman S. Study of the role of retinoblastoma protein in terminal differentiation of murine erythroleukemia cells. Proc Natl Acad Sci U S A 1995; 92:4234-8. [PMID: 7753788 PMCID: PMC41918 DOI: 10.1073/pnas.92.10.4234] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Hexamethylenebisacetamide-induced terminal differentiation of Friend virus-transformed murine erythroleukemia (MEL) cells can be inhibited by okadaic acid, an inhibitor of type 1 and type 2A protein phosphatases. The inhibition is shown to be correlated with prevention of dephosphorylation of retinoblastoma protein (pRB) in cells and bypass of G1 prolongation in the cell cycle. These results suggest that pRB-mediated G1 prolongation is necessary for MEL cells to commit to terminal differentiation. However, further experiments demonstrate that the simple cell cycle exit is not sufficient for commitment to terminal differentiation. Induction of dephosphorylation of pRB and subsequent G1 prolongation by forskolin does not lead MEL cells to differentiate. Additional pRB has been expressed in MEL cells by transfection with a neo-resistant plasmid containing RB cDNA under the control of a cytomegalovirus promoter. Exogenously expressed pRB is hyperphosphorylated in logarithmically growing MEL cells without any noticeable change in growth rate between the transfected cell line and the parental cell line. This result suggests that pRB in MEL cells is regulated by protein kinases and protein phosphatases and not by transcription.
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Affiliation(s)
- S Zhuo
- Laboratory of Neurochemistry, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA
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Xiao S, Shi Z, Zhuo S, Wang C, Zhang Z, Chu B, Zheng J, Chen M. [Field studies on preventive effect of artemether against infection with Schistosoma japonicum]. Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 1995; 13:170-173. [PMID: 8556789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
From August to October 1994, a field trial of preventive treatment with artemether (Art) was carried out in Minglang District of Yiyang City, Hunan Province, an islet with embankment type endemic area nearby southern Donting Lake region. The residents who frequently contacted with the infested water were selected for study and allocated to the Art group and the control group in reference to paired methods of randomization table. About one month before administration of Art, all residents under study were examined by stool hatching technique after nylon-bag concentration to determine the infection rate of each group, and then treated with praziquantel at a single dose of 40 mg/kg in stool egg-negative residents and 50 mg/kg in stool egg-positive ones. In Art group, the first dose of 6 mg/kg was given in late August, followed by repeated dosing every 15 days for 3 times. Placebo (starch) was given to the study residents in the control group at the same time as in Art group. The efficacy was evaluated by stool examination 25-32 days after the last medication. The results showed that after the preventive administration of Art, 20 out of 365 study residents in Art group revealed stool positive with an infection rate of 5.5%, while in the control group 51 out of 376 study residents showed stool positive with an infection rate of 13.6%. The difference between the two groups was statistically significant. Meantime, two cases of acute schistosomiasis were seen in the control group, but none was observed in Art group. The egg per gram of feces (EPG) determined with the Kato-Katz method was 122 +/- 79 (range 12-192) in Art group and 681 +/- 909 (range 12-2,760) in the control group. No apparent adverse side effect was seen during the treatment with Art, and no abnormal change in liver and renal function was detected after the last medication. The preliminary study indicates that application of the preventive administration of Art in the endemic area during the transmission season may effectively reduce both the infection rate and intensity of schistosomiasis.
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Affiliation(s)
- S Xiao
- Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine, Shanghai
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Zhuo S, Clemens JC, Stone RL, Dixon JE. Mutational analysis of a Ser/Thr phosphatase. Identification of residues important in phosphoesterase substrate binding and catalysis. J Biol Chem 1994; 269:26234-8. [PMID: 7929339] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The Ser/Thr phosphoprotein phosphatases (PPases) display similarities in amino acid sequence and biochemical properties. Most members of this family require transition metal ions for activity. The smallest family member, the bacteriophage lambda PPase (lambda-PPase), has been successfully overexpressed in Escherichia coli, purified, and characterized (Zhuo, S., Clemens, J.C., Hakes, D.J., Barford, D., and Dixon, J. E. (1993) J. Biol. Chem. 268, 17754-17761). Site-directed mutagenesis has now been employed to define amino acid residues in lambda-PPase required for metal ion binding and catalysis. Conservative amino acid substitutions at residues Asp20, His22, Asp49, His76, and Glu77 affected lambda-PPase catalysis and metal ion binding, whereas substitutions at residues Arg53 and Arg73 affected catalysis and substrate binding. Each of these residues is invariant in all phosphoprotein phosphatases, suggesting that these residues may play important roles in binding and catalysis in all of the PPases. Computer-assisted sequence alignment further revealed that lambda-PPase residues Asp20, His22, Asp49, His76, Arg53, and Arg73 lie within three larger regions of PPase sequence identity with the consensus sequence (DXH-(approximately 25)-GDXXD-(approximately 25)-GNHD/E). This motif can be found in a wide variety of phosphoesterases unrelated to the PPases and defines structural and catalytic features utilized by a diverse group of enzymes for the hydrolysis of phosphate esters.
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Affiliation(s)
- S Zhuo
- Department of Biological Chemistry, University of Michigan, Ann Arbor 48109
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Zhuo S, Clemens JC, Hakes DJ, Barford D, Dixon JE. Expression, purification, crystallization, and biochemical characterization of a recombinant protein phosphatase. J Biol Chem 1993; 268:17754-61. [PMID: 8394350] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
A protein phosphatase (PPase) from the bacteriophage lambda was overexpressed in Escherichia coli. The recombinant enzyme was purified to homogeneity yielding approximately 17 mg of enzyme from a single liter of bacterial culture. Biochemical characterization of the enzyme showed that it required Mn2+ or Ni2+ as an activator. The recombinant enzyme was active toward serine, threonine, and tyrosine phosphoproteins and phosphopeptides. Surprisingly, the bacterial histidyl phosphoprotein, NRII, was also dephosphorylated by the lambda-PPase. The lambda-PPase shares a number of kinetic and structural properties with the eukaryotic Ser/Thr phosphatases, suggesting that the lambda-PPase will serve as a good model for structure-function studies. Crystallization of the recombinant purified lambda-PPase yielded monoclinic crystals. The crystals diffract to 4.0 A when exposed to synchrotron x-ray radiation.
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Affiliation(s)
- S Zhuo
- Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor 48109-0606
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Zhuo S, Paik SR, Register JA, Allison WS. Photoinactivation of the bovine heart mitochondrial F1-ATPase by [14C]dequalinium cross-links phenylalanine-403 or phenylalanine-406 of an alpha subunit to a site or sites contained within residues 440-459 of a beta subunit. Biochemistry 1993; 32:2219-27. [PMID: 8443163 DOI: 10.1021/bi00060a013] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Synthesis of [14C]dequalinium, 1,1'-(1,10-[1,10-14C]decanediyl)bis[4-amino-2-methylquinolinium ], is described, which photoinactivates the bovine heart mitochondrial F1-ATPase (MF1). Maximal photoinactivation occurs on incorporation of about 1.5 mol of [14C]dequalinium/mol of MF1. Three radioactive species were resolved when photoinactivated enzyme was submitted to polyacrylamide gel electrophoresis at pH 4.0 in the presence of tetradecyltrimethylammonium bromide, which correspond to the alpha and beta subunits and a cross-linked species with an M(r) of 116,000. Fractionation of a tryptic digest of photoinactivated enzyme by high-performance liquid chromatography led to isolation of a radioactive peptide which contains residues 399-420 of a alpha subunit. Two fragments containing equal amounts of radioactivity were obtained on fractionation of an endoproteinase Asp-N digest of the isolated radioactive tryptic peptide by high-performance liquid chromatography. Amino acid sequence analysis showed that both fragments contained residues 399-408 of the alpha subunit, but one was missing Phe-alpha 403 and the other was lacking Phe-alpha 406. Fractionation of a cyanogen bromide digest of photoinactivated enzyme followed by trypsin digestion of partially purified cyanogen bromide fragments and fractionation of the resulting radioactive tryptic fragments yielded several radioactive species comprised of residues 399-420 of the alpha subunit cross-linked to residues 440-459 of the beta subunit and a radioactive fragment containing residues 399-420 of the alpha subunit. Partial sequence analyses of the cross-linked fragments suggest that Phe-alpha 403 and Phe-alpha 406 participate in cross-links, whereas no information was obtained on the site or sites of cross-linking in the beta subunit fragment.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- S Zhuo
- Department of Chemistry, University of California, San Diego, La Jolla 92093-0601
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Abstract
This review focuses on the location and interaction of three functional sites in F1-ATPases. These are catalytic sites which are located in beta subunits, noncatalytic nucleotide-binding sites which are located at interfaces of alpha and beta subunits and modulate the hydrolytic activity of the enzyme, and a site that binds inhibitory amphipathic cations which is at an interface of alpha and beta subunits. The latter site may participate in transmission of conformational signals between catalytic sites in F1 and the proton-conducting apparatus of F0 in the intact ATP synthases.
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Affiliation(s)
- W S Allison
- Department of Chemistry, University of California, San Diego, La Jolla 92093-0601
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Zhuo S, Garrod S, Miller P, Allison WS. Irradiation of the bovine mitochondrial F1-ATPase previously inactivated with 5'-p-fluorosulfonylbenzoyl-8-azido-[3H]adenosine cross-links His-beta 427 to Tyr-beta 345 within the same beta subunit. J Biol Chem 1992; 267:12916-27. [PMID: 1320008] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The bovine heart mitochondrial F1-ATPase (MF1) is inactivated by 5'-p'-fluorosulfonylbenzoyl-8-azidoadenosine (8-N3-FSBA) with an apparent Kd of 0.47 mM at pH 8.0 and 23 degrees C in the absence of light. Irradiation of dark-inactivated enzyme with long-wavelength UV light produced cross-linked dimers and, to a lesser extent, trimers made up of alpha and beta subunits. Two major radioactive peptides were resolved by high-performance liquid chromatography from tryptic digests of MF1 which had been inactivated with 8-N3-FSB[3H]A at pH 8.0 in the dark. Sequence analysis revealed that one contained Tyr-beta 368 and the other contained His-beta 427 which were labeled in the ratio of 18:15. Sequence analysis of radioactive tryptic peptides isolated from digests of irradiated MF1 derivatized with 8-N3-FSB[3H]A showed that photolysis induced cross-linking of His-427 to Tyr-345 within the same beta subunit in high yield. When MF1 derivatized with 8-N3-FSB[3H]A was irradiated in the presence of beta-mercaptoethanol, alpha-beta cross-links were eliminated, whereas those between His-beta 427 and Tyr-beta 345 were unaffected. Analysis of radioactive peptides in tryptic digests of MF1 derivatized with 8-N3-FSB[3H]A and then irradiated in the presence or absence of beta-mercaptoethanol showed that the nitrene generated from reagent attached to Tyr-beta 368 participates in formation of alpha-beta cross-links in the absence of beta-mercaptoethanol. Therefore, the nitrene generated from reagent tethered to His-beta 427 is shielded from solvent and reacts with the side chain of Tyr-beta 345. In contrast, the nitrene generated from reagent attached to Tyr-beta 368 is exposed to solvent, but in the absence of scavengers reacts with side chains present in the alpha subunit. Irradiation of MF1, partially inactivated with 8-N3-FSBA, led to loss of residual ATPase activity without affecting residual ITPase activity. The amount of photoinactivation was greater when partial dark inactivation was performed at pH 6.9, where modification of His-beta 427 predominates, than when performed at pH 8.0, where modification of Tyr-beta 368 predominates. This suggests that cross-linking of His-beta 427 to Tyr-beta 345, and not cross-linking of alpha and beta subunits, is responsible for the augmented inactivation induced by irradiation.
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Affiliation(s)
- S Zhuo
- Department of Chemistry, University of California, La Jolla 92093-0601
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Abstract
The bovine heart mitochondrial F1-ATPase is inhibited in the dark by the amphipathic cation, dequalinium, with a I0.5 of about 12 microM at pH 7.5. When illuminated at 350 nm in the presence of 1.7 microM dequalinium, the F1-ATPase is inactivated with a pseudo-first order rate constant of 7.9 X 10(-3) min-1. The apparent Kd of the dequalinium-enzyme complex was estimated to be about 12.5 microM by examining the rate of inactivation of the ATPase with 1.7-16.7 microM dequalinium. ATP, ADP, Pi, and Mg2+, singly or in combination, protected the ATPase against photoinactivation, with Mg2+ plus Pi being the most effective.
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Affiliation(s)
- S Zhuo
- Department of Chemistry, University of California at San Diego, La Jolla 92093
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