76
|
Zeng L, Manna DD, Yang E. The CHK1/2 Inhibitor Prexasertib Suppresses NOTCH Signaling and Enhances Cytotoxicity of Cisplatin and Radiation in Head and Neck Squamous Cell Carcinoma. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2019.11.118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
77
|
Zheng W, Zeng L, Chen Y. Bioorthogonal Reactions Amplify Magnetic Nanoparticles Binding and Assembly for Ultrasensitive Magnetic Resonance Sensing. Anal Chem 2020; 92:2787-2793. [PMID: 31934754 DOI: 10.1021/acs.analchem.9b05097] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Conventional transverse relaxation time (T2)-mediated magnetic resonance sensors (MRS) that utilizing the target-induces state change of magnetic nanoparticles (MNPs) mainly suffer from low sensitivity. Recent T2-MRS that based on target-induced amount change of MNPs can achieve a higher sensitivity, but these sensors can hardly accommodate small molecules. We herein develop an ultrasensitive T2-MRS that enable the detection of small molecules based on cascade bioorthogonal reactions (BRs)-realized MNPs binding and assembly. Benefiting from rapid and highly selective cascade BRs, a single small molecule target can not only increase MNPs binding but also assembly MNPs, which greatly amplifies T2 signal for sensing based on both the state and amount change of MNPs for the first time. Our strategy is capable of sensing chlorpyrifos with a liner range of 0.1 ng/mL to 1000 ng/mL. We justify the practicability of our assay by detecting chlorpyrifos in apple and cabbage samples, whose accuracy is higher than that of enzyme linked immunosorbent assay. Our assay provides a cascade BRs-mediated MRS that can greatly broaden the use of T2-based MRS for ultrasensitive sensing trace small molecules in complex samples.
Collapse
|
78
|
Mukama O, Wu W, Wu J, Lu X, Liu Y, Liu Y, Liu J, Zeng L. A highly sensitive and specific lateral flow aptasensor for the detection of human osteopontin. Talanta 2019; 210:120624. [PMID: 31987218 DOI: 10.1016/j.talanta.2019.120624] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 12/02/2019] [Accepted: 12/07/2019] [Indexed: 10/25/2022]
Abstract
The rapid determination of human osteopontin (OPN) protein, a potential cancer biomarker, holds substantial promise for point-of-care diagnostics and biomedical applications. To date, most reported platforms for OPN detection are apparatus-dependent, time-consuming, and expensive. Herein, we established a lateral flow biosensor (LFB) for OPN detection. A biotinylated aptamer was used for OPN pre-capture from samples, an antibody for OPN was immobilized on the test line for a second specific target identification, and streptavidin-modified gold nanoparticles were sprayed on the conjugation pad for color detection. This LFB achieved as low as 0.1 ng mL-1 OPN sensitivity with a good dynamic detection between 10 and 500 ng mL-1 within 5 min. Intriguingly, the LFB allowed a qualitative and semi-quantitative detection of OPN in serum at clinically cut-off levels as in cancer patients, and can discriminate OPN from interfering proteins with high specificity. Thus, it is a promising alterative approach for point-of-care OPN screening and detection.
Collapse
|
79
|
Zhuang ST, Cai YJ, Gao HC, Qiu JF, Zeng L, Zheng WJ. Study on the function and mechanism of long non-coding RNA DMTF1v4 in the occurrence of colon cancer. EUROPEAN REVIEW FOR MEDICAL AND PHARMACOLOGICAL SCIENCES 2019; 22:3779-3788. [PMID: 29949153 DOI: 10.26355/eurrev_201806_15260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To investigate the expression of long non-coding RNA (lncRNA) DMTF1v4 in colon cancer, and the relationship between its expression and disease occurrence. MATERIALS AND METHODS Human colon cancer tissues and para-carcinoma tissues were harvested. The expression of lncRNA DMTF1v4 was measured by semi-quantitative PCR. The expression of DMTF1v4 in HT-29 colon cancer cells was downregulated using siRNA, and the effect of its downregulation on cell growth was determined by MTT assay and plate clone assay. The effect of DMTF1v4 downregulation on colon cancer cell migration was determined using a transwell assay and scratch wound assay. The effect of DMTF1v4 on colon cancer cell apoptosis was determined using Annexin V/PI double-staining. The changes in p-ERK, p-JNK, and p-p38 were measured by Western blot. HT-29 cells with downregulated DMTF1v4 expression were used to establish the subcutaneous heterotopic transplantation tumor model in nude mice to study the effect of DMTF1v4 on tumor growth in animals. RESULTS Compared with para-carcinoma tissue, lncRNA DMTF1v4 in colon cancer tissue was highly expressed (p<0.001). Downregulating lncRNA DMTF1v4 in HT-29 cells showed that lncRNA DMTF1v4 promotes cell proliferation and migration, and suppresses apoptosis (p<0.05). The effect of lncRNA DMTF1v4 on the ERK/MAPK signaling pathway was evaluated. The expression of p-ERK, p-JNK, and p-p38 was increased significantly compared with the control group (p<0.01). The effect of downregulating DMTF1v4 on tumor growth in animals showed that tumor growth in nude mice was decreased, and the expression of apoptosis-related proteins was increased (p<0.01). CONCLUSIONS The expression of lncRNA DMTF1v4 is elevated in colon cancer tissues; lncRNA DMTF1v4 promotes colon cancer cell proliferation and migration, and inhibits apoptosis by downregulating the expression of p-ERK, p-JNK, and p-p38, thus affecting the progression of colon cancer. This will provide a basis for the development of new clinical treatments for colon cancer.
Collapse
|
80
|
Wu J, Zeng L, Li N, Liu C, Chen J. A wash-free and label-free colorimetric biosensor for naked-eye detection of aflatoxin B1 using G-quadruplex as the signal reporter. Food Chem 2019; 298:125034. [DOI: 10.1016/j.foodchem.2019.125034] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 06/04/2019] [Accepted: 06/16/2019] [Indexed: 12/22/2022]
|
81
|
Pan J, Zeng L, Chen J. An enzyme-free DNA circuit for the amplified detection of Cd 2+ based on hairpin probe-mediated toehold binding and branch migration. Chem Commun (Camb) 2019; 55:11932-11935. [PMID: 31531427 DOI: 10.1039/c9cc06311k] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
An enzyme-free DNA circuit was designed for the amplified detection of Cd2+ based on hairpin probe-mediated toehold binding and branch migration. A Cd2+-specific aptamer was used to recognize Cd2+ and a G-quadruplex was used to report the detection signal. The assay is sensitive, with a detection limit of 5 pM.
Collapse
|
82
|
Zhang Y, Zeng L, Yang N, Jiang T, Zhou C. P1.01-22 Investigation of Acquired Resistance for EGFR-TKI Plus Bevacizumab as 1st Line Treatment in Patients with EGFR Sensitive Mutant NSCLC. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
83
|
Zhang Y, Zeng L, Yang N, Jiang T, Zhou C. P2.14-51 Dual ALK Fusion Partners as Poor Predictive Marker in First Line Crizotinib Treated ALK Rearranged Non-Small Cell Lung Cancer. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
84
|
Nikolaev A, Zeng L, Bonner J, Yang E. Pharmacological Reactivation of Mutant p53 Sensitizes Tumor Cells to Radiation by Triggering Caspase-Independent Ferroptosis Pathway. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
85
|
Zeng L, Liu S, Deng H, Lu T, Deng X, Liu A, Wan X. Comparing Different Normal Tissue Complication Probability (NTCP) Models of Radiation-Induced Temporal Lobe Injury after Intensity-Modulated Radiation Therapy for Nasopharyngeal Carcinoma. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.1579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
86
|
Zhou D, Zeng L, Pan J, Li Q, Chen J. Autocatalytic DNA circuit for Hg 2+ detection with high sensitivity and selectivity based on exonuclease III and G-quadruplex DNAzyme. Talanta 2019; 207:120258. [PMID: 31594619 DOI: 10.1016/j.talanta.2019.120258] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 08/12/2019] [Accepted: 08/14/2019] [Indexed: 11/27/2022]
Abstract
Utilizing G-quadruplex as the signal report probe, an ultrasensitive and label-free autocatalytic DNA circuit for Hg2+ detection on the basis of exonuclease III (Exo III)-assisted cascade signal amplification has been proposed. In the absence of Hg2+, the hairpin A and the DNA1 cannot hybridize due to the thymine-thymine (T-T) mismatches. Therefore, hairpin probes with the 3'-protruding terminus can be resistant to Exo III digestion, preventing the G-rich sequence to be released. In the presence of Hg2+, the combination of the DNA1 with the 3' end-extruding hairpin A via T-Hg2+-T coordination chemistry triggers the digestion reaction of Exo III, leading to the release of the DNA1 and the sequence with domains c, d, and e. Both of the DNA1 and the sequence with domains c, d, and e can combine with other hairpin probes and activate another round of the cleavage reaction. The produced G-rich sequence can form G-quadruplex structure by binding with N-Methyl mesoporphyrin IX (NMM). The biosensor exhibits excellent selectivity and high sensitivity for Hg2+. The linear range of this biosensor is from 10 fM to 100 nM, and the linear equation can be expressed as: F610 = 1.3 × 105 Lg C + 7.40 × 104 (R2 = 0.998), in which F610 is the fluorescence intensity at 610 nm, C represents the Hg2+ concentrations, and Lg is the logarithm of 10. The detection limit is 10 fM. The biosensor is robust and can be applied to the detection of Hg2+ in water samples. By substituting the target-recognition elements, this sensing system can also be used for the detection of other metal ions.
Collapse
|
87
|
Sirbu D, Zeng L, Waddell PG, Benniston AC. An unprecedented oxidised julolidine-BODIPY conjugate and its application in real-time ratiometric fluorescence sensing of sulfite. Org Biomol Chem 2019; 17:7360-7368. [PMID: 31339165 DOI: 10.1039/c9ob01316d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Reaction of a julolidine-based BODIPY compound with silver(i) ions in the presence of white light produced the oxidised julolidine version (OXJUL) containing a quaternary nitrogen. The oxidation of one ring at the julolidine site is highly unusual and there is no other reported literature example. The fluorescence maximum of OXJUL is altered from 648 nm to 608 nm by the addition of an aqueous solution of Na2SO3 over several minutes. In the presence of a large excess of sulfite a further slower reaction is observed which further shifts the emission maximum to 544 nm. The alterations form the basis of a real-time ratiometric sensor for sulfite and its detection in a white wine.
Collapse
|
88
|
Bai Z, Liu L, Noman MS, Zeng L, Luo M, Li Z. The influence of antibiotics on gut bacteria diversity associated with laboratory-reared Bactrocera dorsalis. BULLETIN OF ENTOMOLOGICAL RESEARCH 2019; 109:500-509. [PMID: 30394234 DOI: 10.1017/s0007485318000834] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The oriental fruit fly Bactrocera dorsalis (Hendel) is a destructive insect pest of a wide range of fruit crops. Commensal bacteria play a very important part in the development, reproduction, and fitness of their host fruit fly. Uncovering the function of gut bacteria has become a worldwide quest. Using antibiotics to remove gut bacteria is a common method to investigate gut bacteria function. In the present study, three types of antibiotics (tetracycline, ampicillin, and streptomycin), each with four different concentrations, were used to test their effect on the gut bacteria diversity of laboratory-reared B. dorsalis. Combined antibiotics can change bacteria diversity, including cultivable and uncultivable bacteria, for both male and female adult flies. Secondary bacteria became the dominant population in female and male adult flies with the decrease in normally predominant bacteria. However, in larvae, only the predominant bacteria decreased, the bacteria diversity did not change a lot, likely because of the short acting time of the antibiotics. The bacteria diversity did not differ among fruit fly treatments with antibiotics of different concentrations. This study showed the dynamic changes of gut bacterial diversity in antibiotics-treated flies, and provides a foundation for research on the function of gut bacteria of the oriental fruit fly.
Collapse
|
89
|
Ren YX, Zeng L, Jiang HR, Ruan WQ, Chen Q, Zhao TS. Rational design of spontaneous reactions for protecting porous lithium electrodes in lithium-sulfur batteries. Nat Commun 2019; 10:3249. [PMID: 31324784 PMCID: PMC6642196 DOI: 10.1038/s41467-019-11168-y] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 06/21/2019] [Indexed: 11/08/2022] Open
Abstract
A rechargeable lithium anode requires a porous structure for a high capacity, and a stable electrode/electrolyte interface against dendrite formation and polysulfide crossover when used in a lithium-sulfur battery. Here, we design two simple steps of spontaneous reactions for protecting porous lithium electrodes. First, a reaction between molten lithium and sulfur-impregnated carbon nanofiber forms a fibrous network with a lithium shell and a carbon core. Second, we coat the surface of this porous lithium electrode with a composite of lithium bismuth alloys and lithium fluoride through another spontaneous reaction between lithium and bismuth trifluoride, solvated with phosphorous pentasulfide, which also polymerizes with lithium sulfide residual in the electrode to form a solid electrolyte layer. This protected porous lithium electrode enables stable operation of a lithium-sulfur battery with a sulfur loading of 10.2 mg cm-2 at 6.0 mA cm-2 for 200 cycles.
Collapse
|
90
|
Chen L, Zhang S, Wu J, Cui J, Zhong L, Zeng L, Ge S. Retraction Note: circRNA_100290 plays a role in oral cancer by functioning as a sponge of the miR-29 family. Oncogene 2019; 38:5750. [PMID: 31197212 PMCID: PMC6755959 DOI: 10.1038/s41388-019-0828-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The Editors and Publisher have agreed to retract the above paper following a request from the authors.
Collapse
|
91
|
Zeng L, Gong J, Rong P, Liu C, Chen J. A portable and quantitative biosensor for cadmium detection using glucometer as the point-of-use device. Talanta 2019; 198:412-416. [DOI: 10.1016/j.talanta.2019.02.045] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 01/29/2019] [Accepted: 02/09/2019] [Indexed: 01/19/2023]
|
92
|
Zeng L, Xie XQ, Li CH, Shi HS, Wang F. Clinical study of the radiotherapy with EDGE accelerator in the treatment of the moderate and severe thyroid associated ophthalmopathy. EUROPEAN REVIEW FOR MEDICAL AND PHARMACOLOGICAL SCIENCES 2019; 23:3471-3477. [PMID: 31081102 DOI: 10.26355/eurrev_201904_17712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To explore the short-term efficacy, acute complications and response factors after the radiotherapy with EDGE accelerator in patients with moderate and severe thyroid-associated ophthalmopathy (TAO). PATIENTS AND METHODS A total of 68 patients with moderate and severe TAO who received the radiotherapy with EDGE accelerator between August 1st, 2017 and May 1st, 2011 were enrolled in the present study. The clinical data were collected, and the efficacy and acute complications were followed up, and the response factors were analyzed. RESULTS Sixty-eight patients (136 eyes) were followed up for 6 months after radiotherapy. The total score after radiotherapy was significantly lower compared to that before the therapy (p<0.05), and the effective rate was 75.74%. After the radiotherapy, the patient's exophthalmia, soft tissue involvement, eye external muscle involvement, corneal involvement, decreased vision and diplopia, tearing and eyelid pain have improved. Acute complications included increased local inflammation, hair loss, pigmentation and xerophthalmias. In addition, multivariate logistic regression analysis demonstrated that thyroid hormone level was the independent factor for the response to the radiotherapy. CONCLUSIONS For patients with moderate and severe TAO, radiotherapy with EDGE accelerator is a safe and effective treatment option. Maintaining normal thyroid hormone level can improve the effective rate of radiotherapy.
Collapse
|
93
|
Xia X, Yu J, Zhao X, Yao Y, Zeng L, Ahmed Z, Shen S, Dang R, Lei C. Genetic diversity and maternal origin of Northeast African and South American donkey populations. Anim Genet 2019; 50:266-270. [PMID: 30854699 DOI: 10.1111/age.12774] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/09/2019] [Indexed: 11/29/2022]
Abstract
To investigate the mtDNA variation and origin of maternal lineages in South American donkeys and to reassess the domestication of donkeys in northeast Africa, we analyzed sequences (489 bp of the D-loop) from 323 domestic donkeys sampled from Peru, Brazil, Ethiopia and Egypt. Altogether, the 323 sequences displayed 53 different haplotypes (45 in Ethiopia, 14 in Egypt, eight in Peru and six in Brazil). Among the four populations, Egyptian donkeys possessed the highest haplotype diversity (0.910 ± 0.032), followed by Brazilian donkeys (0.879 ± 0.060). The Clade I haplotypes dominated in Peruvian donkeys (65%), whereas Clade II haplotypes dominated in Brazilian donkeys (67%). Estimates of FST values showed a high genetic differentiation between Peruvian and Brazilian donkey populations (FST = 0.4066), which could be explained by the complex introduction history of South American donkeys. Phylogeographic analysis indicates that northeast Africa could be the most probable domestication center for Clade I donkeys. Analysis of molecular variance confirmed a weak genetic structure in domestic donkey populations among four continents (Europe, Asia, Africa and South America).
Collapse
|
94
|
Xu A, Shi L, Zeng L, Zhao T. First-principle investigations of nitrogen-, boron-, phosphorus-doped graphite electrodes for vanadium redox flow batteries. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.01.109] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
95
|
Wu W, Jing Z, Yu X, Yang Q, Sun J, Liu C, Zhang W, Zeng L, He H. Recent advances in screening aquatic products for Vibrio spp. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2018.11.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
96
|
Li WM, Liu HQ, Zeng L, Wang SX, Lian H, Yang Y, Wei XC, Zhang Y, Li MG. Bench test of phase measurement on dispersion interferometer for EAST. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:026105. [PMID: 30831737 DOI: 10.1063/1.5058705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
In recent years, different traditional interferometers have been the necessary diagnostic of electronic density measurement on fusion devices. Until now, two main problems always influence the density measurement: the mechanical vibration and fringe jump in the calculation. The dispersion interferometer (DI) with a long-wavelength infrared wavelength is a good choice because mechanical vibrations can be canceled and the fringe jump can be inhibited. This paper describes the bench test of phase measurement using a wedge instead of plasma on the DI. The results show good agreement with the theoretical calculations. In the background measurement, this DI without a vibration isolation system has good performance, and the drift of the baseline is less than 2 × 1017 m-2 in 3 s and less than 5 × 1017 m-2 in 400 s. Plasma data will be obtained during the next campaign on EAST (Experimental and Advanced Superconducting Tokamak).
Collapse
|
97
|
Zeng L, Zhou D, Gong J, Liu C, Chen J. Highly Sensitive Aptasensor for Trace Arsenic(III) Detection Using DNAzyme as the Biocatalytic Amplifier. Anal Chem 2019; 91:1724-1727. [PMID: 30666874 DOI: 10.1021/acs.analchem.8b05466] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A highly sensitive fluorescence biosensing system was designed for the detection of trace amounts of arsenic(III) (As3+) based on target-triggered successive signal amplification strategy. The specific recognition between the target As3+ and the aptamer sequence results in the release of the blocking DNA to trigger the subsequent signal amplification steps. Exonuclease III (Exo III)-mediated DNA recycling digest process is introduced into the sensing system to generate numerous Mg2+-dependent DNAzymes. After magnetic separation, the active DNAzyme with multiple turnovers could catalyze the continuous cleavage of the fluorophore-quencher-functionalized substrate strands, thus yielding a significantly amplified fluorescence signal for target detection. Due to the synergetic signal amplification of Exo III and DNAzyme, the fluorescent biosensor exhibits ultrasensitivity for As3+ monitoring, with a detection limit of 2 pM. Our established biosensor also displays excellent selectivity toward the target As3+ and has been successfully applied to the determination of As3+ in water samples with satisfactory accuracy. This sensing platform can be developed as a universal approach for the fast, sensitive, and accurate detection of aptamer-binding molecules.
Collapse
|
98
|
Lemos JA, Palmer SR, Zeng L, Wen ZT, Kajfasz JK, Freires IA, Abranches J, Brady LJ. The Biology of Streptococcus mutans. Microbiol Spectr 2019; 7:10.1128/microbiolspec.GPP3-0051-2018. [PMID: 30657107 PMCID: PMC6615571 DOI: 10.1128/microbiolspec.gpp3-0051-2018] [Citation(s) in RCA: 287] [Impact Index Per Article: 57.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Indexed: 12/30/2022] Open
Abstract
As a major etiological agent of human dental caries, Streptococcus mutans resides primarily in biofilms that form on the tooth surfaces, also known as dental plaque. In addition to caries, S. mutans is responsible for cases of infective endocarditis with a subset of strains being indirectly implicated with the onset of additional extraoral pathologies. During the past 4 decades, functional studies of S. mutans have focused on understanding the molecular mechanisms the organism employs to form robust biofilms on tooth surfaces, to rapidly metabolize a wide variety of carbohydrates obtained from the host diet, and to survive numerous (and frequent) environmental challenges encountered in oral biofilms. In these areas of research, S. mutans has served as a model organism for ground-breaking new discoveries that have, at times, challenged long-standing dogmas based on bacterial paradigms such as Escherichia coli and Bacillus subtilis. In addition to sections dedicated to carbohydrate metabolism, biofilm formation, and stress responses, this article discusses newer developments in S. mutans biology research, namely, how S. mutans interspecies and cross-kingdom interactions dictate the development and pathogenic potential of oral biofilms and how next-generation sequencing technologies have led to a much better understanding of the physiology and diversity of S. mutans as a species.
Collapse
|
99
|
Zhang Y, Zeng L, Yang N, Li Y, Hu D. P116 Real World Data of 1st Line A+T in Advanced EGFR+ NSCLC: Clinical Outcome, PFS Influential Factors and Acquired Resistance. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.10.142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
100
|
Si Y, Bao H, Han L, Chen L, Zeng L, Jing L, Xing Y, Geng Y. Dexmedetomidine attenuation of renal ischaemia-reperfusion injury requires sirtuin 3 activation. Br J Anaesth 2018; 121:1260-1271. [PMID: 30442253 DOI: 10.1016/j.bja.2018.07.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 06/20/2018] [Accepted: 07/12/2018] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Dexmedetomidine attenuates renal ischaemia and reperfusion (I/R) injury, but its mechanism of action is unclear. As sirtuin 3 (SIRT3) activation can alleviate acute kidney injury, we investigated whether dexmedetomidine acts through SIRT3 to reduce renal I/R injury. METHODS The potential involvement of SIRT3 in dexmedetomidine attenuation of renal I/R injury was tested in HK2 cells subjected to hypoxia/reoxygenation and C57BL/6J mice subjected to renal I/R. A short interfering RNA targeting SIRT3 was used in some experiments to examine the potential role of SIRT3. Cell death and mitochondrial membrane potential (Δψm) were analysed in cultured cells. Mitochondrial damage in mice was assessed using electron microscopy and markers for renal function. Expression of cyclophilin D, cytochrome c, and SIRT3, and the level of cyclophilin D acetylation were determined. RESULTS Hypoxia/reoxygenation of HK2 cells increased cell death, cytochrome C expression, and cyclophilin D acetylation, and decreased Δψm and SIRT3 expression (P<0.05). Dexmedetomidine attenuated these changes. The dexmedetomidine effects were enhanced by SIRT3 overexpression and eliminated by SIRT3 knockdown. I/R in mice damaged renal function, and increased histological lesions, mitochondrial damage, cytochrome c expression, and cyclophilin D acetylation, while SIRT3 activity was decreased by 51% (P<0.05). Dexmedetomidine inhibited these changes in mice expressing normal levels of SIRT3, but not in SIRT3-knockdown mice. CONCLUSIONS Dexmedetomidine appears to act, at least in part, by up-regulating SIRT3 to inhibit mitochondrial damage and cell apoptosis and thereby protect against renal I/R injury.
Collapse
|