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Bai Z, Rong D, Li M, Xu G, Liu S, Zeng J, Lv Y, Tang Y, Wen X. Hierarchical Mg/Al hydrotalcite oxide hollow microspheres with excellent adsorption capability towards Congo red. Dalton Trans 2024; 53:3744-3755. [PMID: 38299609 DOI: 10.1039/d3dt03816e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
A novel citrate anion-intercalated Mg/Al layered double hydroxide (CA-LDH) is synthesized via a one-step hydrothermal process. The synthesized CA-LDH is a hollow flower-like microsphere composed of thin nanoflakes (10 nm in thickness). After calcination, the formed Mg/Al layered double oxide (CA-LDO) hollow microspheres possess a high specific surface area of 247.8 m2 g-1 and a high pore volume of 0.97 cm3 g-1, which endow them with excellent adsorption ability towards Congo red (CR). The maximum adsorption capacity of CR onto CA-LDO can reach up to 1883 mg g-1. The significantly improved adsorption capacity of CA-LDO can be attributed to its unique structures of hierarchical hollow microspheres, in which the hierarchical porous shell layer provides enough adsorption sites to anchor the dye molecules, and the hollow core can preserve the absorbed dye. This study provides a promising novel adsorbent which can be used for efficient water remediation.
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Affiliation(s)
- Zeng Bai
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
| | - Daoqing Rong
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
| | - Ming Li
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
| | - Guilong Xu
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
| | - Shucheng Liu
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
| | - Jianyun Zeng
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
| | - Yinghao Lv
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
| | - Yi Tang
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
| | - Xiaogang Wen
- School of Materials Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
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Cui ZH, Zhang XJ, Shang HQ, Wang X, Rong D. Glutamine protects myocardial ischemia-reperfusion injury in rats through the PI3K/Akt signaling pathway. Eur Rev Med Pharmacol Sci 2021; 24:444-451. [PMID: 31957859 DOI: 10.26355/eurrev_202001_19944] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To study the protective mechanism of glutamine (Gln) on myocardial ischemia-reperfusion (IR) injury in rats through the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway. MATERIALS AND METHODS A total of 30 healthy SD rats weighing 200-300 g were used in this experiment. They were randomly divided into 3 groups: sham group (n=10), myocardial IR injury group (IR group, n=10), IR+Gln group (n=10). The protein expression levels of phosphorylated Akt (p-Akt), total Akt (t-Akt), phosphorylated mammalian target of rapamycin (p-mTOR), mTOR, proliferating cell nuclear antigen (PCNA), P21, and Tubulin were determined by Western blotting (WB). Quantitative Polymerase Chain Reaction (qPCR) was applied to detect the messenger ribonucleic acid (mRNA) levels of Akt and mTOR. 3-(4,5)-dimethylthiazol(-z-y1)-3,5-diphenyl tetrazolium bromide (MTT) test was utilized to examine the proliferation ability of cardiomyocytes in vitro. Besides, the contents of the inflammatory cytokines, tumor necrosis factor-alpha (TNF-α), and interleukin-6 (IL-6) were measured via enzyme-linked immunosorbent assay (ELISA). Cell apoptosis in each group was examined through Hoechst staining. RESULTS Compared with those in the sham group, ratios of p-AKT/AKT, p-mTOR/mTOR, and the level of PCNA extremely significantly decreased, but the level of P21 notably increased in IR group (p<0.01). In comparison with those in the IR group, ratios of p-AKT/AKT, p-mTOR/mTOR, and the level of PCNA were remarkably raised, while the level of P21 was remarkably reduced in IR+Gln group (p<0.05). QRT-PCR results manifested that there were no significant differences in the mRNA levels of Akt and mTOR among the three groups [no significant difference (NS)]. Moreover, the cell proliferation ability in IR group was remarkably lower than that in the sham group (p<0.01), while it was enhanced in the IR+Gln group compared with that in the IR group (p<0.05). Additionally, IR group had significantly elevated expression levels of TNF-α and IL-6 compared with the sham group (p<0.01), whereas the IR+Gln group had notably decreased expression levels of TNF-α and IL-6 compared with IR group (p<0.05). In comparison with that in the sham group, the apoptosis in IR group was significantly raised (p<0.01), and compared with that in the IR group, the apoptosis in the IR+Gln group prominently decreased (p<0.05). The contents of the inflammatory cytokines, TNF-α, and IL-6 presented the same trends among the three groups. CONCLUSIONS Gln activates the PI3K/Akt signaling pathway by increasing the levels of p-AKT and p-mTOR. Gln can increase the PCNA level and reduce the P21 level, so as to enhance the proliferation ability of cardiomyocytes. Besides, Gln reduces the levels of inflammatory cytokines, TNF-α, and IL-6, and inhibits cell apoptosis. Finally, Gln can protect cells from myocardial IR injury by activating the PI3K/Akt signaling pathway.
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Affiliation(s)
- Z-H Cui
- Department of Geriatric, Hulunbeir People's Hospital, Hulunbeir, China.
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Lu Y, Wen H, Rong D, Zhou Z, Liu H. Clinical characteristics and radiological features of children infected with the 2019 novel coronavirus. Clin Radiol 2020; 75:520-525. [PMID: 32389373 PMCID: PMC7252054 DOI: 10.1016/j.crad.2020.04.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [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: 02/25/2020] [Accepted: 04/28/2020] [Indexed: 12/28/2022]
Abstract
AIM To identify and summarise the common findings from 2019 novel coronavirus (2019-nCoV) infections in children. MATERIALS AND METHODS The clinical characteristics and radiological findings (chest radiography and chest computed tomography [CT]) of nine children infected with the 2019-nCoV were reviewed in this retrospective case series. RESULTS Among the children, six had fever (including two children with cough), one had only cough, one had a stuffy nose when initially diagnosed, and one was an asymptomatic carrier. Chest radiographs seemed mostly normal in six cases whereas increased and/or disordered bilateral bronchovascular shadows and dense hilar shadows were seen in three cases. Chest CT exhibited no obvious abnormal signs in four cases. Typical CT findings included patchy, peripheral ground-grass opacities, subpleural lamellar dense shadows, and parenchymal bands. Pleural effusions, mediastinal lymphadenopathy, cavitation, and pleural thickening were absent. CONCLUSION The clinical manifestations and radiological findings of the 2019-nCoV-infected children were mild and lacked a typical pattern.
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Affiliation(s)
- Y Lu
- Department of Radiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 318 Renmin Middle Road, Guangzhou, 510120, China
| | - H Wen
- Department of Radiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 318 Renmin Middle Road, Guangzhou, 510120, China
| | - D Rong
- Department of Radiology, Third Affiliated Hospital of Sun Yat-Sen University, 600 Tianhe Road, Guangzhou, 510630, China
| | - Z Zhou
- Department of Radiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 318 Renmin Middle Road, Guangzhou, 510120, China
| | - H Liu
- Department of Radiology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, 318 Renmin Middle Road, Guangzhou, 510120, China.
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Tan L, Rong D, Yang Y, Zhang B. Effect of Oxidized Soybean Oils on Oxidative Status and Intestinal Barrier Function in Broiler Chickens. Braz J Poult Sci 2018. [DOI: 10.1590/1806-9061-2017-0610] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- L Tan
- China Agricultural University, China; Guizhou Academy of Agricultural Sciences, China
| | - D Rong
- Guizhou Academy of Agricultural Sciences, China
| | - Y Yang
- China Agricultural University, China
| | - B Zhang
- China Agricultural University, China
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Abstract
Chemiluminescent probes offer highly sensitive quantitative analyses of proteins blotted from electrophoretic gels onto a supporting matrix (e.g. nitrocellulose or polyvinylidene difluoride). Visualization of signals from probes involves the emission of light that is dependent on a number of variables (e.g. conjugated enzyme activity, antibody titer, hybridization efficiency, substrate concentration, chemical reactivity, temperature, etc.). Thus, it is important to be able to correct for these variations. For example, the exposure time of the blot to the detection medium (e.g., film or digital camera) is a critical variable in the final results. Several protein samples separated on a single blot (e.g. one-dimensional resolution) can be compared from the ratio of the individual proteins, but comparison of separate blots completed on different days requires a chemiluminescent standard. The situation is more complex when only one sample per gel/blot is used (i.e. two-dimensional electrophoresis (2-DE)). This paper describes a method for preparing agarose embedded standardized strips that contain dilutions of antigens that can be visualized with the corresponding probe antibody. This standardization strip can be produced from common laboratory supplies and provides a method to correct for alterations in chemiluminescent intensities from different 2-DE analysis. Several standardization strips can be produced simultaneously and then used during the electroblotting step of different blots on different days.
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Affiliation(s)
- C C Conrad
- Molecular Aging Unit, Department of Molecular Biology and Immunology, University of North Texas Health Science Center, Fort Worth, Texas 76107, USA
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Rong D, Lin CL, d'Avignon DA, Lovey AJ, Rosenberger M, Li E. 19F-NMR studies of retinol transfer between cellular retinol binding proteins and phospholipid vesicles. FEBS Lett 1997; 402:116-20. [PMID: 9037178 DOI: 10.1016/s0014-5793(96)01509-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [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: 02/03/2023]
Abstract
The cellular retinol binding proteins, CRBP and CRBP II, are implicated in the cellular uptake of retinol and intracellular trafficking of retinol between sites of metabolic processing. 19F-NMR studies of retinol transfer between CRBP and CRBP II and phospholipid vesicles, using either fluorine-labeled ligand or protein, demonstrated that there was significantly more transfer of retinol from CRBP II to lipid vesicles than from CRBP. Differences in how readily protein-bound retinol is released to lipid bilayers may lead to differences in how these two proteins modulate intracellular retinol metabolism.
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Affiliation(s)
- D Rong
- Department of Medicine, Washington University, School of Medicine, St. Louis, MO 63110, USA
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Norris AW, Rong D, d'Avignon DA, Rosenberger M, Tasaki K, Li E. Nuclear magnetic resonance studies demonstrate differences in the interaction of retinoic acid with two highly homologous cellular retinoic acid binding proteins. Biochemistry 1995; 34:15564-73. [PMID: 7492559 DOI: 10.1021/bi00047a023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [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: 01/25/2023]
Abstract
Cellular retinoic acid binding protein-I (CRABP-I) and cellular retinoic acid binding protein-II (CRABP-II) are highly homologous, 15 kDa proteins which bind all-trans-retinoic acid. In the adult, CRABP-II is expressed predominately in the epidermis, while CRAPB-I is expressed in a variety of tissues. To obtain structural information which could aid the design of more selective ligands, isotope-directed NMR methods were employed to observe the CRABP-bound conformation of 13C-labeled retinoic acid and to identify its contact points with neighboring amino acids. Analysis of HMQC, HMQC-TOCSY, and 13C-TOCSY-REVINEPT on CRABP-bound (2,3,6,7,8,9,10,11,19-13C)- and (1,4,5,8,9,16, 17,18,19-13C)-all trans-retinoic acid allowed the unambiguous assignment of all labeled protons and their attached 13C resonances. The volumes of 16 olefinic proton-methyl NOE cross-peaks measured from 30-ms 13C-(omega 2)-filtered 1H NOESY experiments were used to determine the conformations about the 6-, 8-, and 10-single bonds of the retinoic acid polyene chain. These spectra show qualitatively distinct NOE patterns for the two CRABPs. Measured cross-peak volumes for CRABP-II bound retinoic acid were well predicted by a single, static conformational having a 6-s torsion angle of -60 degrees skewed from a cis conformation. In contrast, for CRABP-I no single, static conformation was able to match the pattern of cross-peaks, suggesting motion about the 6-s bond. The measured cross-peaks were best described by 8-s and 10-s torsion angles of 180 degrees +/- 30 degrees, a trans configuration, for both proteins. The pattern of intermolecular NOESY cross-peaks between 13C-labeled protons in the ring portion of retinoic acid and protein protons were different between CRABP-I and CRABP-II. These differences coincide well with nearby amino acid substitutions in the recently reported X-ray structures of crystalline CRABP-I and CRABP-II and may assist rational design of selective ligands.
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Affiliation(s)
- A W Norris
- Department of Medicine, Washington University, St. Louis, Missouri 63110, USA
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Rong D, Lovey AJ, Rosenberger M, d'Avignon DA, Li E. NMR studies of fluororetinol analogs complexed to two homologous rat cellular retinol-binding proteins. Biochim Biophys Acta 1994; 1208:136-44. [PMID: 8086427 DOI: 10.1016/0167-4838(94)90170-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Comparative 19F-NMR studies of fluororetinol analogs with rat cellular retinol binding protein II (CRBP II) and rat cellular retinol-binding protein (CRBP) were performed to probe differences in the binding interactions of these two homologous proteins. Line shape analyses of 19F-NMR spectra of (E,E,Z,E)-6-fluoro-9-(4-methoxy-2,3,6-trimethylphenyl)-3,7-dimethyl- 2,4,6,8-nonatetren-1-ol (ligand 1), (E,E,Z,E)-6-fluoro-9-(2,2' dimethyl-6-methylcyclohexenyl)-3,7- dimethyl-2,4,6,8-nonatetren-1-ol (ligand 2), (E,Z,E,E)-5-fluoro-9-(2,2'- dimethyl-6-methylcyclohexenyl)-3,7-dimethyl-2,4,6,8-nonatetren+ ++-1-ol (ligand 3), when complexed with CRBP II at temperatures ranging from 0-45 degrees C, revealed that the 19F resonances corresponding to the bound ligand were in slow chemical exchange between two resonance frequencies. This was further supported by a 2D-NOESY exchange experiment. The kex at 25 degrees C was estimated from spectral simulation and fitting analyses to be 887 s-1, 1010 s-1 and 771 s-1 for CRBP II complexed 1, 2, and 3, respectively. In contrast, only a single absorption was observed for bound ligands complexed with rat CRBP over this temperature range, suggesting that the conformational dynamics of retinol binding are different for these two closely homologous proteins.
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Affiliation(s)
- D Rong
- Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110
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Rong D, Lovey AJ, Rosenberger M, d'Avignon A, Ponder J, Li E. Differential binding of retinol analogs to two homologous cellular retinol-binding proteins. J Biol Chem 1993; 268:7929-34. [PMID: 8463314] [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 comparative study of the interactions of rat cellular retinol-binding protein (CRBP) and cellular retinol-binding protein II (CRBP II) with a number of synthetic phenyl-substituted analogs of all-trans-retinol was performed using fluorescence and nuclear magnetic resonance analysis. These studies indicate that CRBP II is more sensitive to modifications of the ring moiety than CRBP. Removal of the two methyl substituents on the ring which are ortho to the polyene chain abolishes binding to CRBP II. Conformational analysis of the ligands indicates that these two methyl groups influence the planarity of the ligand. The identification of monospecific ligands may prove useful for studying the physiological roles of these two proteins.
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Affiliation(s)
- D Rong
- Department of Medicine, Washington University, St. Louis, Missouri 63110
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Rong D, Lovey A, Rosenberger M, d'Avignon A, Ponder J, Li E. Differential binding of retinol analogs to two homologous cellular retinol-binding proteins. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)53047-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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