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Liu H, Zhu W, Zou Y, Xia X. Antimicrobial Activity and Mechanisms of Punicalagin against Vibrio parahaemolyticus. Foods 2024; 13:1366. [PMID: 38731737 PMCID: PMC11082947 DOI: 10.3390/foods13091366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 04/23/2024] [Accepted: 04/26/2024] [Indexed: 05/13/2024] Open
Abstract
This study sought to explore the antimicrobial activity of punicalagin against V. parahaemolyticus and its potential modes of action. V. parahaemolyticus ATCC 17802 and RIMD 2210633Sm were exposed to punicalagin, and the energy production, membrane potential, and envelope permeability, as well as the interaction with cell biomolecules, were measured using a variety of fluorescent probes combined with electrophoresis and Raman spectroscopy. Punicalagin treatment disrupted the envelope integrity and induced a decrease in intracellular ATP and pH. The uptake of 1-N-phenyl-naphtylamine (NPN) demonstrated that punicalagin weakened the outer membrane. Punicalagin damaged the cytoplasmic membrane, as indicated by the membrane depolarization and the leakage of intracellular potassium ions, proteins, and nucleic acids. Electronic microscopy observation visualized the cell damage caused by punicalagin. Further, gel electrophoresis coupled with the Raman spectrum assay revealed that punicalagin affected the protein expression of V. parahaemolyticus, and there was no effect on the integrity of genomic DNA. Therefore, the cell envelope and proteins of V. parahaemolyticus were the assailable targets of punicalagin treatment. These findings suggested that punicalagin may be promising as a natural bacteriostatic agent to control the growth of V. parahaemolyticus.
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Affiliation(s)
| | | | | | - Xiaodong Xia
- State Key Laboratory of Marine Food Processing and Safety Control, National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China; (H.L.); (W.Z.); (Y.Z.)
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2
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Liao S, Tian L, Qi Q, Hu L, Wang M, Gao C, Cui H, Gai Z, Gong G. Transcriptome Analysis of Protocatechualdehyde against Listeria monocytogenes and Its Effect on Chicken Quality Characteristics. Foods 2023; 12:2625. [PMID: 37444363 DOI: 10.3390/foods12132625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 06/29/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023] Open
Abstract
The development of natural antimicrobial agents offers new strategies for food preservation due to the health hazards associated with the spoilage of meat products caused by microbial contamination. In this paper, the inhibitory mechanism of protocatechualdehyde (PCA) on Listeria monocytogenes was described, and its effect on the preservation of cooked chicken breast was evaluated. The results showed that the minimal inhibitory concentration (MIC) of PCA on L. monocytogenes was 0.625 mg/mL. Secondly, PCA destroyed the integrity of the L. monocytogenes cell membrane, which was manifested as a decrease in membrane hyperpolarization, intracellular ATP level, and intracellular pH value. Field emission gun scanning electron microscopy (FEG-SEM) observed a cell membrane rupture. Transcriptome analysis showed that PCA may inhibit cell growth by affecting amino acid, nucleotide metabolism, energy metabolism, and the cell membrane of L. monocytogenes. Additionally, it was discovered that PCA enhanced the color and texture of cooked chicken breast meat while decreasing the level of thiobarbituric acid active substance (TBARS). In conclusion, PCA as a natural antibacterial agent has a certain reference value in extending the shelf life of cooked chicken breast.
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Affiliation(s)
- Sichen Liao
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Lu Tian
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Qi Qi
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Lemei Hu
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Minmin Wang
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Chang Gao
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Haoyue Cui
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Zhongchao Gai
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Guoli Gong
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
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3
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Lu X, Luo T, Li X, Wang Y, Ma Y, Wang B. Effects of combined remediation of pre-ozonation and bioaugmentation on degradation of benzo[a]pyrene and microbial community structure in soils. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:55557-55568. [PMID: 36897443 DOI: 10.1007/s11356-023-25980-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
The combination technique of pre-ozonation and bioaugmentation is promising for remediating benzo[a]pyrene (BaP)-contaminated soil. However, little is known about the effect of coupling remediation on the soil biotoxicity, soil respiration, enzyme activity, microbial community structure, and microbial in the process of remediation. This study developed two coupling remediation strategies (pre-ozonation coupled with bioaugmentation by addition of polycyclic aromatic hydrocarbons (PAHs) specific degrading bacteria or activated sludge), compared with sole ozonation and sole bioaugmentation, to improve degradation of BaP and recovery of soil microbial activity and community structure. Results showed that the higher removal efficiency of BaP (92.69-93.19%) was found in coupling remediation, compared with sole bioaugmentation (17.71-23.28%). Meanwhile, coupling remediation significantly reduced the soil biological toxicity, promoted the rebound of microbial counts and activity, and recovered the species numbers and microbial community diversity, compared with sole ozonation and sole bioaugmentation. Besides, it was feasible to replace microbial screening with activated sludge, and coupling remediation by addition of activated sludge was more conducive to the recovery of soil microbial communities and diversity. This work provides a strategy of pre-ozonation coupled with bioaugmentation to further degrade BaP in soil by promoting the rebound of microbial counts and activity, as well as the recovery of species numbers and microbial community diversity.
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Affiliation(s)
- Xueqin Lu
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, 610500, People's Republic of China
| | - Ting Luo
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, 610500, People's Republic of China
- Sichuan Jinmei Environmental Protection Co., Ltd, Chengdu, Sichuan, 610096, People's Republic of China
| | - Xi Li
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, 610500, People's Republic of China.
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, Sichuan, 610500, People's Republic of China.
| | - Yaxuan Wang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, 610500, People's Republic of China
| | - Yongsong Ma
- School of Resource and Environmental Sciences, Hubei International Scientific and Technologies Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan, 430072, People's Republic of China
| | - Bing Wang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, 610500, People's Republic of China
- Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, Sichuan, 610500, People's Republic of China
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Gong F, Yang N, Xu J, Yang X, Wei K, Hou L, Liu B, Zhao H, Liu Z, Cheng L. Calcium Hydride-Based Dressing to Promote Wound Healing. Adv Healthc Mater 2023; 12:e2201771. [PMID: 36226993 DOI: 10.1002/adhm.202201771] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 09/11/2022] [Indexed: 01/18/2023]
Abstract
Wound microenvironment with excess reactive oxygen species (ROS) can significantly inhibit wound healing. Encouraged by hydrogen molecules (H2 ) with effective ROS scavenging and calcium hydride (CaH2 ) with sufficient H2 supply, the authors for the first time employed CaH2 as a therapeutic H2 donor and starch as a diluent to construct CaH2 pulvis dressing for wound healing treatment. It has been found that CaH2 by generating H2 exhibited excellent ROS scavenging performance, favorable for preserving the oxidative-stress-induced cell death. After being applied onto the skin wound, the CaH2 pulvis dressing with the unique ROS-scavenging ability can accelerate skin wound healing in healthy/diabetic mice (small animal models) and Bama mini-pigs (large animal model). Such CaH2 dressing can release H2 to relieve the inflammation levels, decrease the secretion of pro-inflammatory cytokines, increase the infiltration of inflammation-suppressive immune cells, and promote the regeneration of new blood vessels and collagens, thereby accelerating wound healing. This work highlighted that the integration of anti-oxidation and anti-inflammation functions based on CaH2 dressing endowed it with a promising possibility for the treatment of inflammatory diseases.
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Affiliation(s)
- Fei Gong
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Nailin Yang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Jiachen Xu
- Department of Interventional Radiology, The First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Xiaoyuan Yang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Kailu Wei
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Linqian Hou
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Bo Liu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - He Zhao
- Children's Hospital of Soochow University, Pediatric Research Institute of Soochow University, Suzhou, 215123, China
| | - Zhuang Liu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Liang Cheng
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
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Membrane damage mechanism of protocatechualdehyde against Micrococcus luteus and its effect on pork quality characteristics. Sci Rep 2022; 12:18856. [PMID: 36344587 PMCID: PMC9640607 DOI: 10.1038/s41598-022-23309-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 10/29/2022] [Indexed: 11/09/2022] Open
Abstract
This study investigated the mechanism of membrane damage by protocatechualdehyde (PCA) against Micrococcus luteus and assessed effects of PCA on the sensory and physicochemical properties of pork. The mechanism of PCA inhibition on M. luteus was studied by determining the minimum inhibitory concentration (MIC) based on membrane potential, intracellular ATP concentration, intracellular pH, confocal laser scanning microscopy (CLSM), and field emission gun scanning electron microscopy (FEG-SEM). The results showed that the MIC of PCA against M. luteus was 1.25 mg/mL. Hyperpolarization of the bacterial cell membrane, a decrease in the intracellular ATP concentration, and intracellular pH indicated that PCA damaged the cell membrane of M. luteus. FEG-SEM observation revealed that PCA could cause surface collapse, cell membrane rupture, and content outflow of M. luteus. Additionally, PCA was found to inhibit increases in the total number of colonies, the thiobarbituric acid reactive substances (TBARS) value growth rate, and moisture mobility in raw pork. Additionally, it improved the color and texture of raw pork, all of which effectively prolonged its shelf life. This study will encourage the application of PCA as a natural antibacterial agent in the food industry.
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Li Q, Qin X, Kou X, Li J, Li Z, Chen C. Anagliptin promotes apoptosis in mouse colon carcinoma cells via MCT-4/lactate-mediated intracellular acidosis. Exp Ther Med 2022; 23:282. [PMID: 35317435 PMCID: PMC8908463 DOI: 10.3892/etm.2022.11211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 01/17/2022] [Indexed: 12/24/2022] Open
Abstract
Cancer cells frequently exhibit an acidic extracellular microenvironment, where inversion of the transmembrane pH gradient is associated with tumor proliferation and metastasis. To elucidate a new therapeutic target against cancer, the current study aimed to determine the mechanism by which the dipeptidyl peptidase-4 inhibitor anagliptin regulates the cellular pH gradient and concomitant extracellular acidosis during cancer progression. A total of 5x105 CT-26 cells (resuspended in phosphate buffer saline) were injected subcutaneously in the right flank of male BALB/c mice (weighing 25-28 g). The tumor samples were harvested, and lactate was detected using a lactate assay kit. Immunohistochemistry was used to detect the Ki67 and PCNA. MTT assay and flow cytometric were used to detect cell viability. Intracellular pH was detected by fluorescence pH indicator. The results revealed that anagliptin effectively reduced tumor growth, but did not affect the body weight of treated mice. Anagliptin reduced the accumulation of lactate in tumor sample. Treatment with anagliptin stimulated the apoptosis of CT-26 cells. And lactate excretion inhibition is accompanied by an increase in extracellular pH (pHe) after treatment with anagliptin. Furthermore, anagliptin induced intracellular acidification and reversed the low pHe gradient via monocarboxylate transporter-4 (MCT-4)-mediated lactate excretion. Additionally, anagliptin reversed the aberrant transmembrane extracellular/intracellular pH gradient by suppressing MCT-4-mediated lactate excretion, while also reducing mitochondrial membrane potential and inducing apoptosis. These data revealed a novel function of anagliptin in regulating lactate excretion from cancer cells, suggesting that anagliptin may be used as a potential treatment for cancer.
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Affiliation(s)
- Qi Li
- The Biotherapy Center, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150086, P.R. China
| | - Xiaoling Qin
- The Biotherapy Center, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150086, P.R. China
| | - Xiaotong Kou
- Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Jingyu Li
- Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Zhongsha Li
- Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
| | - Chang Chen
- Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
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7
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Wu M, Tian L, Fu J, Liao S, Li H, Gai Z, Gong G. Antibacterial mechanism of Protocatechuic acid against Yersinia enterocolitica and its application in pork. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108573] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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8
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Tang R, Sun W, Zhang JC, Mao L, Quanquin N, Wu D, Sun Y. Expression of Human Uncoupling Protein-1 in Escherichia coli Decreases its Survival Under Extremely Acidic Conditions. Curr Microbiol 2022; 79:77. [DOI: 10.1007/s00284-022-02762-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 01/08/2022] [Indexed: 11/03/2022]
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9
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Evaluation of the membrane damage mechanism of thymol against Bacillus cereus and its application in the preservation of skim milk. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108435] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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10
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Tian L, Wang X, Zhang D, Wu M, Xue Z, Liu Z, Yang S, Li H, Gong G. Evaluation of the membrane damage mechanism of protocatechualdehyde against Yersinia enterocolitica and simulation of growth inhibition in pork. Food Chem 2021; 363:130340. [PMID: 34144416 DOI: 10.1016/j.foodchem.2021.130340] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 04/15/2021] [Accepted: 06/06/2021] [Indexed: 11/24/2022]
Abstract
This study sought to explore the antibacterial mechanism associated with membrane damage in Yersinia enterocolitica by protocatechualdehyde (PCA), thus providing improved knowledge of whether PCA is suitable for pork preservation. The minimum inhibitory concentration (MIC) of PCA was determined by micro-broth dilution. We then characterized functional and morphological changes of Y. enterocolitica treated with PCA. Finally, the growth inhibition model of PCA against Y. enterocolitica in pork was established using the response surface method. Accordingly, the MIC of PCA against Y. enterocolitica was found to be 0.3125 mg/mL. Significant observations incorporated membrane depolarization, a markedly decreased intracellular ATP and pH, and morphological changes induced by PCA treatment. After PCA treatment under low temperatures, the average Y. enterocolitica count in pork decreased by two log cycles. According to the obtained findings, PCA exhibited satisfactory performances as a food preservative to control the growth and reproduction of Y. enterocolitica in pork.
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Affiliation(s)
- Lu Tian
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Xuyang Wang
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Di Zhang
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Mi Wu
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Zhifei Xue
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Zhiqiang Liu
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Siqi Yang
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Hui Li
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China
| | - Guoli Gong
- College of Food and Bioengineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, China.
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12
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Girault M, Siano R, Labry C, Latimier M, Jauzein C, Beneyton T, Buisson L, Del Amo Y, Baret JC. Variable inter and intraspecies alkaline phosphatase activity within single cells of revived dinoflagellates. ISME JOURNAL 2021; 15:2057-2069. [PMID: 33568788 DOI: 10.1038/s41396-021-00904-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 01/04/2021] [Accepted: 01/20/2021] [Indexed: 01/21/2023]
Abstract
Adaptation of cell populations to environmental changes is mediated by phenotypic variability at the single-cell level. Enzyme activity is a key factor in cell phenotype and the expression of the alkaline phosphatase activity (APA) is a fundamental phytoplankton strategy for maintaining growth under phosphate-limited conditions. Our aim was to compare the APA among cells and species revived from sediments of the Bay of Brest (Brittany, France), corresponding to a pre-eutrophication period (1940's) and a beginning of a post-eutrophication period (1990's) during which phosphate concentrations have undergone substantial variations. Both toxic marine dinoflagellate Alexandrium minutum and the non-toxic dinoflagellate Scrippsiella acuminata were revived from ancient sediments. Using microfluidics, we measured the kinetics of APA at the single-cell level. Our results indicate that all S. acuminata strains had significantly higher APA than A. minutum strains. For both species, the APA in the 1990's decade was significantly lower than in the 1940's. For the first time, our results reveal both inter and intraspecific variabilities of dinoflagellate APA and suggest that, at a half-century timescale, two different species of dinoflagellate may have undergone similar adaptative evolution to face environmental changes and acquire ecological advantages.
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Affiliation(s)
| | | | | | | | | | | | - Lionel Buisson
- Univ. Bordeaux, CNRS, CRPP, UMR5031, 33600, Pessac, France
| | - Yolanda Del Amo
- Université de Bordeaux, UMR CNRS 5805 EPOC, Station Marine d'Arcachon, 33120, Arcachon, France
| | - Jean-Christophe Baret
- Univ. Bordeaux, CNRS, CRPP, UMR5031, 33600, Pessac, France. .,Institut Universitaire de France, 75005, Paris, France.
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13
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Le Guern F, Mussard V, Gaucher A, Rottman M, Prim D. Fluorescein Derivatives as Fluorescent Probes for pH Monitoring along Recent Biological Applications. Int J Mol Sci 2020; 21:E9217. [PMID: 33287208 PMCID: PMC7729466 DOI: 10.3390/ijms21239217] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 11/24/2020] [Accepted: 12/01/2020] [Indexed: 12/19/2022] Open
Abstract
Potential of hydrogen (pH) is one of the most relevant parameters characterizing aqueous solutions. In biology, pH is intrinsically linked to cellular life since all metabolic pathways are implicated into ionic flows. In that way, determination of local pH offers a unique and major opportunity to increase our understanding of biological systems. Whereas the most common technique to obtain these data in analytical chemistry is to directly measure potential between two electrodes, in biological systems, this information has to be recovered in-situ without any physical interaction. Based on their non-invasive optical properties, fluorescent pH-sensitive probe are pertinent tools to develop. One of the most notorious pH-sensitive probes is fluorescein. In addition to excellent photophysical properties, this fluorophore presents a pH-sensitivity around neutral and physiologic domains. This review intends to shed new light on the recent use of fluorescein as pH-sensitive probes for biological applications, including targeted probes for specific imaging, flexible monitoring of bacterial growth, and biomedical applications.
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Affiliation(s)
- Florent Le Guern
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, 78035 Versailles, France; (V.M.); (A.G.); (D.P.)
| | - Vanessa Mussard
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, 78035 Versailles, France; (V.M.); (A.G.); (D.P.)
| | - Anne Gaucher
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, 78035 Versailles, France; (V.M.); (A.G.); (D.P.)
| | - Martin Rottman
- Faculté de Médecine Simone Veil, Université de Versailles St Quentin, INSERM UMR U1173, 2 Avenue de la Source de la Bièvre, 78180 Montigny le Bretonneux, France;
- Hôpital Raymond Poincaré, AP-HP, GHU Paris Saclay, 104 Bd Poincaré, 92380 Garches, France
| | - Damien Prim
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, 78035 Versailles, France; (V.M.); (A.G.); (D.P.)
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14
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Abstract
Cells of the vast majority of organisms are subject to temperature, pressure, pH, ionic strength, and other stresses. We discuss these effects in the light of protein folding and protein interactions in vitro, in complex environments, in cells, and in vivo. Protein phase diagrams provide a way of organizing different structural ensembles that occur under stress and how one can move among ensembles. Experiments that perturb biomolecules in vitro or in cells by stressing them have revealed much about the underlying forces that are competing to control protein stability, folding, and function. Two phenomena that emerge and serve to broadly classify effects of the cellular environment are crowding (mainly due to repulsive forces) and sticking (mainly due to attractive forces). The interior of cells is closely balanced between these emergent effects, and stress can tip the balance one way or the other. The free energy scale involved is small but significant on the scale of the "on/off switches" that control signaling in cells or of protein-protein association with a favorable function such as increased enzyme processivity. Quantitative tools from biophysical chemistry will play an important role in elucidating the world of crowding and sticking under stress.
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Affiliation(s)
- Mayank Boob
- Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Champaign, IL 61801, United States
| | - Yuhan Wang
- Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Champaign, IL 61801, United States
| | - Martin Gruebele
- Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Champaign, IL 61801, United States
- Department of Chemistry, Department of Physics, Center for the Physics of Living Cells, and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Champaign, IL 61801, United States
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15
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Fang Y, Cheng J, Wang G, Dong T, Wang S, Gu C, Zou G, Ming H, Xu L. Grating-tuned dual-wavelength Nile red dye laser. APPLIED OPTICS 2019; 58:4345-4351. [PMID: 31251239 DOI: 10.1364/ao.58.004345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 04/21/2019] [Indexed: 06/09/2023]
Abstract
Dual-wavelength operation of grating-tuned dye laser systems was demonstrated in this paper. We used the second harmonic generation of a Q-switched Nd:YAG laser to pump the Nile red solvent (dissolved in ethanol) in the Littrow configuration and the Littman-Metcalf configuration. By rotating the grating 3.6° in the Littrow configuration and the tuning mirror 3.9° in the Littman-Metcalf configuration, we obtained a 72 and 46 nm tuning-range dye laser output, respectively. Meanwhile by parallelly moving the grating in the Littrow configuration and the tuning mirror in the Littman-Metcalf configuration, we achieved the separation of dual wavelength from 0.7 to 5 nm in the former and 1.5 to 4 nm in the latter, which were in the terahertz range and could find applications in the terahertz source after using difference frequency technology. Finally, after considering the laser trajectories in the two configurations, we theoretically analyzed the reasons for overall tuning and separation tuning of dual wavelength.
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16
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Inhibitory Mechanisms of DHA/CQ on pH and Iron Homeostasis of Erythrocytic Stage Growth of Plasmodium Falciparum. Molecules 2019; 24:molecules24101941. [PMID: 31137574 PMCID: PMC6571875 DOI: 10.3390/molecules24101941] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 05/11/2019] [Accepted: 05/13/2019] [Indexed: 12/19/2022] Open
Abstract
Malaria is an infectious disease caused by Plasmodium group. The mechanisms of antimalarial drugs DHA/CQ are still unclear today. The inhibitory effects (IC50) of single treatments with DHA/CQ or V-ATPase inhibitor Baf-A1 or combination treatments by DHA/CQ combined with Baf-A1 on the growth of Plasmodium falciparum strain 3D7 was investigated. Intracellular cytoplasmic pH and labile iron pool (LIP) were labeled by pH probe BCECF, AM and iron probe calcein, AM, the fluorescence of the probes was measured by FCM. The effects of low doses of DHA (0.2 nM, 0.4 nM, 0.8 nM) on gene expression of V-ATPases (vapE, vapA, vapG) located in the membrane of DV were tested by RT-qPCR. DHA combined with Baf-A1 showed a synergism effect (CI = 0.524) on the parasite growth in the concentration of IC50. Intracellular pH and irons were effected significantly by different doses of DHA/Baf-A1. Intracellular pH was decreased by CQ combined with Baf-A1 in the concentration of IC50. Intracellular LIP was increased by DHA combined with Baf-A1 in the concentration of 20 IC50. The expression of gene vapA was down-regulated by all low doses of DHA (0.2/0.4/0.8 nM) significantly (p < 0.001) and the expression of vapG/vapE were up-regulated by 0.8 nM DHA significantly (p < 0.001). Interacting with ferrous irons, affecting the DV membrane proton pumping and acidic pH or cytoplasmic irons homeostasis may be the antimalarial mechanism of DHA while CQ showed an effect on cytoplasmic pH of parasite in vitro. Lastly, this article provides us preliminary results and a new idea for antimalarial drugs combination and new potential antimalarial combination therapies.
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