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Ma Y, Cao X, Wang H, Song X, Hu D. In Vitro and In Vivo Activities of Tilmicosin and Acetylisovaleryltylosin Tartrate against Toxoplasma gondii. Int J Mol Sci 2022; 23:ijms23179586. [PMID: 36076987 PMCID: PMC9455974 DOI: 10.3390/ijms23179586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 08/16/2022] [Accepted: 08/22/2022] [Indexed: 11/25/2022] Open
Abstract
Toxoplasma gondii is a widespread intracellular pathogen that infects humans and a variety of animals. The current therapeutic strategy for human toxoplasmosis is a combination of sulphadiazine and pyrimethamine. However, this combination still has a high failure rate and is ineffective against chronic infections. Therefore, it is important to discover a new anti-T. gondii drug that is safer and more effective in both humans and animals. In this study, we describe the anti-T. gondii activities of the 16-membered macrolide tilmicosin and acetylisovaleryltylosin tartrate (ATLL). Both tilmicosin and ATLL potently inhibited T. gondii with a half-maximal effective concentration (EC50) of 17.96 μM and 10.67 μM, respectively. Interestingly, tilmicosin and ATLL had different effects on the parasites. ATLL exhibited a potent inhibitory effect on intracellular parasite growth, while tilmicosin suppressed parasites extracellularly. By studying the lytic cycle of T. gondii after treatment, we found that ATLL potently inhibited the intracellular proliferation of tachyzoites, while tilmicosin affected the invasion of tachyzoites. Immunofluorescence analysis using ATLL-treated T. gondii showed morphologically abnormal parasites, which may be due to the inhibition of tachyzoite proliferation and division. In addition, tilmicosin and ATLL significantly delayed the death of mice caused by acute toxoplasmosis. Our results suggest that ATLL has potent anti-Toxoplasma activity both in vitro and in vivo and may be an alternative to toxoplasmosis in the future.
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Su R, Zhang Z, Chang C, Peng Q, Cheng X, Pang J, He H, Lambers H. Interactive effects of phosphorus fertilization and salinity on plant growth, phosphorus and sodium status, and tartrate exudation by roots of two alfalfa cultivars. Ann Bot 2022; 129:53-64. [PMID: 34582551 PMCID: PMC8752396 DOI: 10.1093/aob/mcab124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 09/23/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND AND AIMS Soil phosphorus (P) deficiency and salinity are constraints to crop productivity in arid and semiarid regions. Salinity may weaken the effect of P fertilization on plant growth. We investigated the interactive effects of soil P availability and salinity on plant growth, P nutrition and salt tolerance of two alfalfa (Medicago sativa) cultivars. METHODS A pot experiment was carried out to grow two cultivars of alfalfa in a loess soil under a combination of different rates of added P (0, 40, 80 and 160 mg P kg-1 soil as monopotassium phosphate) and sodium chloride (0, 0.4, 0.8 and 1.6 g NaCl kg-1 soil). Plant biomass, concentrations of P ([P]), sodium ([Na]) and potassium ([K]) were determined, and rhizosheath carboxylates were analysed. KEY RESULTS There were significant interactions between soil P availability and salinity on some, but not all, of the parameters investigated, and interactions depended on cultivar. Plant growth and P uptake were enhanced by P fertilization, but inhibited by increased levels of salinity. Increasing the salinity resulted in decreased plant P-uptake efficiency and [K]/[Na]. Only soil P availability had a significant effect on the amount of tartrate in the rhizosheath of both cultivars. CONCLUSIONS Increased salinity aggravated P deficiency. Appropriate application of P fertilizers improved the salt tolerance of alfalfa and increased its productivity in saline soils.
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Affiliation(s)
- Rui Su
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, China
| | - Zekun Zhang
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, China
| | - Chao Chang
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, China
| | - Qi Peng
- Chinese Academy of Sciences and Ministry of Water Resources, Institute of Soil and Water Conservation, Yangling, Shaanxi, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xiao Cheng
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, China
| | - Jiayin Pang
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, WA, Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, Australia
| | - Honghua He
- State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi, China
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, China
- Chinese Academy of Sciences and Ministry of Water Resources, Institute of Soil and Water Conservation, Yangling, Shaanxi, China
- School of Biological Sciences, The University of Western Australia, Perth, WA, Australia
| | - Hans Lambers
- The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, Australia
- School of Biological Sciences, The University of Western Australia, Perth, WA, Australia
- Department of Plant Nutrition, China Agricultural University, Beijing, China
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Sawicka AK, Jaworska J, Brzeska B, Sabisz A, Samborowska E, Radkiewicz M, Szurowska E, Winklewski PJ, Szarmach A, Olek RA. L-Carnitine Combined with Leucine Supplementation Does Not Improve the Effectiveness of Progressive Resistance Training in Healthy Aged Women. J Nutr Health Aging 2022; 26:945-953. [PMID: 36259583 DOI: 10.1007/s12603-022-1848-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
OBJECTIVES To evaluate the effect of L-carnitine (LC) in combination with leucine supplementation on muscle strength and muscle hypertrophy in aged women participating in a resistance exercise training (RET) program. DESIGN/SETTING/PARTICIPANTS Thirty-seven out of sixty (38.3% dropout) healthy women aged 60-75 years (mean 67.6 ± 0.7 years) completed the intervention in one of three groups. One of the supplemented groups received 1 g of L-carnitine-L-tartrate in combination with 3 g of L-leucine per day (LC+L group; n = 12), and the second supplemented group received 4 g of L-leucine per day (L group; n = 13). The control group (CON group; n = 12) received no supplementation. INTERVENTION All three groups completed the same RET protocol involving exercise sessions twice per week for 24 weeks. MEASUREMENTS Before and after the experiment, participants performed isometric and isokinetic muscle strength testing on the Biodex dynamometer. The cross-sectional areas of the major knee extensors and total thigh muscles were assessed using magnetic resonance imaging. Fasting serum levels of insulin-like growth factor-1 (IGF-1), myostatin and decorin, and plasma levels of total carnitine (TC) and trimethylamine-N-oxide (TMAO) levels were measured. RESULTS The 24-week RET significantly increased muscle strength and muscle volume, but the group and time interactions were not significant for the muscle variables analyzed. Plasma total carnitine increased only in the LC+L group (p = 0.009). LC supplementation also caused a significant increase in plasma TMAO, which was higher after the intervention in the LC+L group than in the L (p < 0.001), and CON (p = 0.005) groups. The intervention did not change plasma TMAO concentration in the L (p = 0.959) and CON (p = 0.866) groups. After the intervention serum decorin level was higher than before in both supplemented groups combined (p = 0.012), still not significantly different to post intervention CON (p = 0.231). No changes in serum IGF-1 and myostatin concentrations and no links between the changes in blood markers and muscle function or muscle volume were observed. CONCLUSIONS LC combined with leucine or leucine alone does not appear to improve the effectiveness of RET.
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Affiliation(s)
- A K Sawicka
- Robert A. Olek, Department of Athletics, Strength, and Conditioning, Poznan University of Physical Education, Krolowej Jadwigi 27/39; 61-871 Poznan, Poland, e-mail: , ORCID: 0000-0002-3714-7386
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Bhattacharya E, Mandal Biswas S, Pramanik P. Maleic and L-tartaric acids as new anti-sprouting agents for potatoes during storage in comparison to other efficient sprout suppressants. Sci Rep 2021; 11:20029. [PMID: 34625595 PMCID: PMC8501061 DOI: 10.1038/s41598-021-99187-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 09/22/2021] [Indexed: 11/09/2022] Open
Abstract
Inhibiting sprouting of potatoes is an interesting subject needed for potato storage and industry. Sprouting degrades the quality of tuber along with releasing α-solanine and α-chaconine, which are harmful for health. Sprout suppressants, available in the market, are either costly or toxic to both health and environment. So, there is a need for developing countries to explore new sprouting suppressant compound which is cheap, non-toxic and reasonably efficient in comparison to commercial ones. We have established that simple maleic acid and L-tartaric acid are effective sprout suppressing agents. Both can hinder sprouting up to 6 weeks and 4 weeks post treatment respectively at room temperature in dark. These do not affect the quality parameters, retain the moisture content and maintain the stout appearance of the tubers along the total storage period. Thus maleic acid and L-tartaric acid would qualify as alternative, cheap, efficient sprout suppressant for potato storage and processing.
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Affiliation(s)
- Ekta Bhattacharya
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Calcutta, 700108, India.
| | - Suparna Mandal Biswas
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Calcutta, 700108, India.
| | - Panchanan Pramanik
- Agricultural and Ecological Research Unit, Indian Statistical Institute, 203, B.T. Road, Calcutta, 700108, India
- Department of Chemistry, GLA University, Mathura, 281406, India
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Steinberg J, Lynch SE. Lactic Acid, Citric Acid, and Potassium Bitartrate (Phexxi) Vaginal Gel for Contraception. Am Fam Physician 2021; 103:628-629. [PMID: 33982994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Affiliation(s)
| | - Sarah E Lynch
- Binghamton University School of Pharmacy and Pharmaceutical Sciences, Binghamton, NY, USA
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Bellamine A, Pham TNQ, Jain J, Wilson J, Sahin K, Dallaire F, Seidah NG, Durkee S, Radošević K, Cohen ÉA. L-Carnitine Tartrate Downregulates the ACE2 Receptor and Limits SARS-CoV-2 Infection. Nutrients 2021; 13:nu13041297. [PMID: 33919991 PMCID: PMC8071056 DOI: 10.3390/nu13041297] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/11/2021] [Accepted: 04/12/2021] [Indexed: 12/14/2022] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been responsible for one of the worst pandemics in modern history. Several prevention and treatment strategies have been designed and evaluated in recent months either through the repurposing of existing treatments or the development of new drugs and vaccines. In this study, we show that L-carnitine tartrate supplementation in humans and rodents led to significant decreases of key host dependency factors, notably angiotensin-converting enzyme 2 (ACE2), transmembrane protease serine 2 (TMPRSS2), and Furin, which are responsible for viral attachment, viral spike S-protein cleavage, and priming for viral fusion and entry. Interestingly, pre-treatment of Calu-3, human lung epithelial cells, with L-carnitine tartrate led to a significant and dose-dependent inhibition of the infection by SARS-CoV-2. Infection inhibition coincided with a significant decrease in ACE2 mRNA expression levels. These data suggest that L-carnitine tartrate should be tested with appropriate trials in humans for the possibility to limit SARS-CoV-2 infection.
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Affiliation(s)
- Aouatef Bellamine
- Lonza Consumer Health, Morristown, NJ 07960, USA;
- Correspondence: (A.B.); (É.A.C.)
| | - Tram N. Q. Pham
- Institut de Recherche Clinique de Montreal, Montreal, QC H2W1R7, Canada; (T.N.Q.P.); (J.J.); (F.D.); (N.G.S.)
| | - Jaspreet Jain
- Institut de Recherche Clinique de Montreal, Montreal, QC H2W1R7, Canada; (T.N.Q.P.); (J.J.); (F.D.); (N.G.S.)
| | - Jacob Wilson
- Applied Science and Performance Institute, Tampa, FL 33607, USA;
| | - Kazim Sahin
- Department of Animal Nutrition, Faculty of Veterinary Medicine, Firat University, Elazig 23119, Turkey;
| | - Frederic Dallaire
- Institut de Recherche Clinique de Montreal, Montreal, QC H2W1R7, Canada; (T.N.Q.P.); (J.J.); (F.D.); (N.G.S.)
| | - Nabil G. Seidah
- Institut de Recherche Clinique de Montreal, Montreal, QC H2W1R7, Canada; (T.N.Q.P.); (J.J.); (F.D.); (N.G.S.)
| | - Shane Durkee
- Lonza Consumer Health, Morristown, NJ 07960, USA;
| | | | - Éric A. Cohen
- Institut de Recherche Clinique de Montreal, Montreal, QC H2W1R7, Canada; (T.N.Q.P.); (J.J.); (F.D.); (N.G.S.)
- Department of Microbiology, Infectiology and Immunology, Université de Montréal, Montreal, QC H3T 1J4, Canada
- Correspondence: (A.B.); (É.A.C.)
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Chen HC, Zhang SL, Wu KJ, Li R, He XR, He DN, Huang C, Wei H. The effects of exogenous organic acids on the growth, photosynthesis and cellular ultrastructure of Salix variegata Franch. Under Cd stress. Ecotoxicol Environ Saf 2020; 187:109790. [PMID: 31639642 DOI: 10.1016/j.ecoenv.2019.109790] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 06/23/2019] [Revised: 09/28/2019] [Accepted: 10/08/2019] [Indexed: 05/25/2023]
Abstract
We studied the effects of three organic acids (citric acid, tartaric acid and malic acid) on the biomass, photosynthetic pigment content and photosynthetic parameters of Salix variegata under Cd stress and observed the ultrastructure of mesophyll cells in each treatment. Cd stress significantly reduced photosynthesis by reducing the content of pigments and disrupting chloroplast structure, which consequently decreased the biomass. However, respective addition of three organic acids greatly increased the biomass of S. variegata under Cd stress. Among them, the effect of malic acid or tartaric acid on shoot and total biomass accumulation was greater than that of citric acid. The alleviation of biomass probably related with the photosynthetic process. Results revealed that treatment with each organic acid enhanced the net photosynthesis rate under Cd stress. Malic acid promoted plant growth and biomass by increasing the chlorophyll content and mitigating damage to the photosynthetic apparatus resulting from Cd stress. Tartaric acid had little impact on the photosynthetic pigment content, but it was important in mitigating the ultrastructural damage of plants caused by Cd. Addition of citric acid significantly increased the carotenoid as well as the number and volume of chloroplasts in mesophyll cells, while the mitigation of structural damage in the photosynthetic apparatus was weaker than that in tartaric acid or malic acid treatment. It is concluded that application of tartaric acid or malic acid is effective in increasing the growth potential of S. variegata under Cd stress and thus can be a promising approach for the phytoremediation of Cd-contaminated soil.
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Affiliation(s)
- Hong-Chun Chen
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China; Guizhou Provincial Water Conservancy Research Institute, Guiyang, 550002, China
| | - Song-Lin Zhang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Ke-Jun Wu
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Rui Li
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Xin-Rui He
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Dan-Ni He
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Chao Huang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Hong Wei
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China.
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Wang YR, Yang WD. [Lithagogue effects of Pyrrosia lingua from Guizhou province on experimental renal calculus in rats]. Zhongguo Zhong Yao Za Zhi 2018; 43:3291-3300. [PMID: 30200732 DOI: 10.19540/j.cnki.cjcmm.20180514.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Indexed: 06/08/2023]
Abstract
To screen the active fractions with lithagogue effects of Pyrrosia lingua from Guizhou province and preliminarily investigate its mechanism. The rats were fed with 1% ethylene glycol and 2% ammonium chloride to establish the nephrolithiasis models, which were used to evaluate thelithagogue effects of different polar fractions of P. lingua from Guizhou province. The level of urinary calcium and oxalic acid in urine, renal calcium, oxalic acid, superoxide dismutase (SOD), catalase(CAT) and malondialdehyde (MDA) in renal tissues,as well as crystalline deposit and lithogenesis in renal tissues and the levels of creatinine(Cr) and blood urea nitrogen (BUN) in the serum were detected. The effective compounds were inferred from the analysis of active fractions extract based on LC-MS technology. Petroleum ether fraction and dichloromethane fraction of P. lingua from Guizhou province can reduce renal oxalic acid and renal calcium concentration, increase urinary oxalic acid and urine calcium, with significant inhibitory effect on the formation of renal calculus in rats, significantly increase SOD and CAT activities in renal tissues, and significantly reduce MDA levels. LC-MS analysis showed that the caffeine, citric acid and tartaric acid among the compounds from petroleum ether fraction and dichloromethane fraction had lithagogue effects. Both the petroleum ether fraction and dichloromethane fraction of P. lingua from Guizhou province showed good effect on prevention and treatment of calculus in middle dose groups, and the mechanism may be associated with antioxidation, reducing calcium oxalate crystal deposition, and promoting calcium oxalatecrystal release, in addition, caffeine, citric acid and tartaric acid had lithagogue effects.
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Affiliation(s)
- Ya-Ru Wang
- Guiyang College of traditional Chinese medicine, Guiyang 550000, China
| | - Wu-de Yang
- Guiyang College of traditional Chinese medicine, Guiyang 550000, China
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Chen Y, Zhang S, Xu X, Yao P, Li T, Wang G, Gong G, Li Y, Deng O. Effects of surfactants on low-molecular-weight organic acids to wash soil zinc. Environ Sci Pollut Res Int 2016; 23:4629-4638. [PMID: 26527338 DOI: 10.1007/s11356-015-5700-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [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: 09/25/2015] [Accepted: 10/26/2015] [Indexed: 06/05/2023]
Abstract
Soil washing is an effective approach to the removal of heavy metals from contaminated soil. In this study, the effects of the surfactants sodium dodecyl sulfate, Triton X-100, and non-ionic polyacrylamide (NPAM) on oxalic acid, tartaric acid, and citric acid used to remove zinc from contaminated soils were investigated. The Zn removal efficiencies of all washing solutions showed a logarithmic increase with acid concentrations from 0.5 to 10.0 g/L, while they decreased as pH increased from 4 to 9. Increasing the reaction time enhanced the effects of surfactants on Zn removal efficiencies by the acids during washing and significantly (P < 0.05) improved the removal under some mixed cases. Oxalic acid suffered antagonistic effects from the three surfactants and seriously damaged soil nutrients during the removal of soil Zn. Notably, the three surfactants caused synergistic effects on tartaric and citric acid during washing, with NPAM leading to an increase in Zn removal by 5.0 g/L citric acid of 10.60 % (P < 0.05) within 2 h. NPAM also alleviated the loss of cation exchange capacity of washed soils and obviously improved soil nitrogen concentrations. Overall, combining citric acid with NPAM offers a promising approach to the removal of zinc from contaminated soil.
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Affiliation(s)
- Yue Chen
- College of Environment, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
| | - Shirong Zhang
- College of Environment, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China.
| | - Xiaoxun Xu
- College of Environment, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
| | - Ping Yao
- College of Environment, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
| | - Ting Li
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
| | - Guiyin Wang
- College of Environment, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
| | - Guoshu Gong
- College of Agriculture, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
| | - Yun Li
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
| | - Ouping Deng
- College of Resources, Sichuan Agricultural University, Wenjiang, 611130, People's Republic of China
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Faig A, Arthur TD, Fitzgerald PO, Chikindas M, Mintzer E, Uhrich KE. Biscationic Tartaric Acid-Based Amphiphiles: Charge Location Impacts Antimicrobial Activity. Langmuir 2015; 31:11875-11885. [PMID: 26488599 DOI: 10.1021/acs.langmuir.5b03347] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cationic amphiphiles have received increasing attention as antimicrobials given their unique ability to disrupt bacteria cell membranes. While extensive research has demonstrated that amphiphiles' hydrophobic-to-charge ratio significantly modulates antibacterial activity, less work has focused on elucidating the specific impact of charge location on amphiphile bioactivity. In this study, two series of cationic amphiphiles, termed bola-like and gemini-like, were synthesized with analogous hydrophobic-to-charge ratios yet differing charge location, and their resulting antibacterial activity was assessed. Bola-like amphiphiles exhibited preferential activity against two Gram-positive bacteria, with activity increasing with increasing hydrophobicity, whereas gemini-like amphiphiles were active against both Gram-positive and Gram-negative bacteria, with activity decreasing with increasing hydrophobicity. After identifying lead compounds from each amphiphile series (bola- and gemini-like), biophysical experiments indicated that both amphiphiles were membrane-active; notably, the lead gemini-like amphiphile exhibited a strong dependence on electrostatic interactions for membrane interaction. In contrast, the lead bola-like amphiphile exhibited a reliance on both hydrophobic and electrostatic contributions. These results demonstrate that charge location significantly impacts cationic amphiphiles' antibacterial and membrane activity.
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Affiliation(s)
- Allison Faig
- Department of Chemistry and Chemical Biology, Rutgers University , Piscataway, New Jersey 08854, United States
| | | | | | - Michael Chikindas
- Center for Digestive Health, New Jersey Institute for Food, Nutrition and Health , New Brunswick, New Jersey 08901, United States
| | - Evan Mintzer
- Lander College of Arts and Sciences, Touro College , 1602 Avenue J, Brooklyn, New York 11230, United States
- Department of Chemistry and Biochemistry, Stern College , 245 Lexington Ave., Room 552, New York, New York 10016, United States
| | - Kathryn E Uhrich
- Department of Chemistry and Chemical Biology, Rutgers University , Piscataway, New Jersey 08854, United States
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Guo J, Chen X, Shi Y, Lan Y, Qin C. Rapid Photodegradation of Methyl Orange (MO) Assisted with Cu(II) and Tartaric Acid. PLoS One 2015; 10:e0134298. [PMID: 26241043 PMCID: PMC4524705 DOI: 10.1371/journal.pone.0134298] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 07/07/2015] [Indexed: 11/19/2022] Open
Abstract
Cu(II) and organic carboxylic acids, existing extensively in soil and aquatic environments, can form complexes that may play an important role in the photodegradation of organic contaminants. In this paper, the catalytic role of Cu(II) in the removal of methyl orange (MO) in the presence of tartaric acid with light was investigated through batch experiments. The results demonstrate that the introduction of Cu(II) could markedly enhance the photodegradation of MO. In addition, high initial concentrations of Cu(II) and tartaric acid benefited the decomposition of MO. The most rapid removal of MO assisted by Cu(II) was achieved at pH 3. The formation of Cu(II)-tartaric acid complexes was assumed to be the key factor, generating hydroxyl radicals (•OH) and other oxidizing free radicals under irradiation through a ligand-to-metal charge-transfer pathway that was responsible for the efficient degradation of MO. Some intermediates in the reaction system were also detected to support this reaction mechanism.
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Affiliation(s)
- Jing Guo
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Xue Chen
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Ying Shi
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China
| | - Yeqing Lan
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China
- * E-mail:
| | - Chao Qin
- College of Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China
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12
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Barati D, Walters JD, Shariati SRP, Moeinzadeh S, Jabbari E. Effect of organic acids on calcium phosphate nucleation and osteogenic differentiation of human mesenchymal stem cells on peptide functionalized nanofibers. Langmuir 2015; 31:5130-5140. [PMID: 25879768 DOI: 10.1021/acs.langmuir.5b00615] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Carboxylate-rich organic acids play an important role in controlling the growth of apatite crystals and the extent of mineralization in the natural bone. The objective of this work was to investigate the effect of organic acids on calcium phosphate (CaP) nucleation on nanofiber microsheets functionalized with a glutamic acid peptide and osteogenic differentiation of human mesenchymal stem cells (hMSCs) seeded on the CaP-nucleated microsheets. High molecular weight poly(dl-lactide) (DL-PLA) was mixed with low molecular weight L-PLA conjugated with Glu-Glu-Gly-Gly-Cys peptide, and the mixture was electrospun to generate aligned nanofiber microsheets. The nanofiber microsheets were incubated in a modified simulated body fluid (mSBF) supplemented with different organic acids for nucleation and growth of CaP crystals on the nanofibers. Organic acids included citric acid (CA), hydroxycitric acid (HCA), tartaric acid (TART), malic acid (MA), ascorbic acid (AsA), and salicylic acid (SalA). HCA microsheets had the highest CaP content at 240 ± 10% followed by TART and CA with 225 ± 8% and 225 ± 10%, respectively. The Ca/P ratio and percent crystallinity of the nucleated CaP in TART microsheets was closest to that of stoichiometric hydroxyapatite. The extent of CaP nucleation and growth on the nanofiber microsheets depended on the acidic strength and number of hydrogen-bonding hydroxyl groups of the organic acids. Compressive modulus and degradation of the CaP nucleated microsheets were related to percent crystallinity and CaP content. Osteogenic differentiation of hMSCs seeded on the microsheets and cultured in osteogenic medium increased only for those microsheets nucleated with CaP by incubation in CA or AsA-supplemented mSBF. Further, only CA microsheets stimulated bone nodule formation by the seeded hMSCs.
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Affiliation(s)
- Danial Barati
- Biomimetic Materials and Tissue Engineering Laboratory, Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Joshua D Walters
- Biomimetic Materials and Tissue Engineering Laboratory, Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Seyed Ramin Pajoum Shariati
- Biomimetic Materials and Tissue Engineering Laboratory, Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Seyedsina Moeinzadeh
- Biomimetic Materials and Tissue Engineering Laboratory, Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Esmaiel Jabbari
- Biomimetic Materials and Tissue Engineering Laboratory, Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
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13
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Monselise EBI, Levkovitz A, Kost D. Ultraviolet radiation induces stress in etiolated Landoltia punctata, as evidenced by the presence of alanine, a universal stress signal: a ¹⁵N NMR study. Plant Biol (Stuttg) 2015; 17 Suppl 1:101-107. [PMID: 24889211 DOI: 10.1111/plb.12198] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [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: 03/22/2014] [Accepted: 03/24/2014] [Indexed: 06/03/2023]
Abstract
Analysis with (15) N NMR revealed that alanine, a universal cellular stress signal, accumulates in etiolated duckweed plants exposed to 15-min pulsed UV light, but not in the absence of UV irradiation. The addition of 10 mm vitamin C, a radical scavenger, reduced alanine levels to zero, indicating the involvement of free radicals. Free D-alanine was detected in (15) N NMR analysis of the chiral amino acid content, using D-tartaric acid as solvent. The accumulation of D-alanine under stress conditions presents a new perspective on the biochemical processes taking place in prokaryote and eukaryote cells.
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Affiliation(s)
- E B-I Monselise
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, Israel
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14
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Palakawong C, Sophanodora P, Toivonen P, Delaquis P. Optimized extraction and characterization of antimicrobial phenolic compounds from mangosteen (Garcinia mangostana L.) cultivation and processing waste. J Sci Food Agric 2013; 93:3792-3800. [PMID: 23801044 DOI: 10.1002/jsfa.6277] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [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: 06/27/2012] [Revised: 02/11/2013] [Accepted: 06/25/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND Applications for antimicrobials derived from the mangosteen (Garcinia mangostana L.) plant are presently restricted by high production costs. Extraction from cultivation or processing waste streams using a solvent-free approach could lessen to permit commercial applications in food processing and preservation. RESULTS Phenolics were extracted from mangosteen bark, leaf and fruit pericarp in methanol and in water using response surface methodology to optimize recovery. Initial examination of antimicrobial effects revealed a lack of antimicrobial activity against fungi and weak activity against the Gram-negative bacteria Escherichia coli and Salmonella typhimurium. In contrast, extracts prepared from bark or fruit pericarp exhibited strong pH-dependent bacteriostatic and bactericidal effects against Listeria monocytogenes and Staphylococcus aureus. Activity was slightly weaker in aqueous extracts due to lower concentrations of tartaric acid esters and flavonols than in methanolic extracts. Measurement of propidium iodide uptake and ATP leakage indicated that the extracts induced damage to the membrane of Gram-positive bacteria. CONCLUSION Extracts of mangosteen bark and fruit pericarp contain mixtures of phenolic compounds with activity against Gram-positive bacteria, notably Listeria monocytogenes. Extraction of phenolics from mangosteen waste could yield fractions for potential applications in the formulation of low-cost processing aids or sanitizers for the food industry.
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Affiliation(s)
- Choothaweep Palakawong
- Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
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15
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Poree DE, Zablocki K, Faig A, Moghe PV, Uhrich KE. Nanoscale amphiphilic macromolecules with variable lipophilicity and stereochemistry modulate inhibition of oxidized low-density lipoprotein uptake. Biomacromolecules 2013; 14:2463-9. [PMID: 23795777 PMCID: PMC3773991 DOI: 10.1021/bm400537w] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Amphiphilic macromolecules (AMs) based on carbohydrate domains functionalized with poly(ethylene glycol) can inhibit the uptake of oxidized low density lipoprotein (oxLDL) and counteract foam cell formation, a key characteristic of early atherogenesis. To investigate the influence of lipophilicity and stereochemistry on the AMs' physicochemical and biological properties, mucic acid-based AMs bearing four aliphatic chains (2a) and tartaric acid-based AMs bearing two (2b and 2l) and four aliphatic chains (2g and 2k) were synthesized and evaluated. Solution aggregation studies suggested that both the number of hydrophobic arms and the length of the hydrophobic domain impact AM micelle sizes, whereas stereochemistry impacts micelle stability. 2l, the meso analogue of 2b, elicited the highest reported oxLDL uptake inhibition values (89%), highlighting the crucial effect of stereochemistry on biological properties. This study suggests that stereochemistry plays a critical role in modulating oxLDL uptake and must be considered when designing biomaterials for potential cardiovascular therapies.
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Affiliation(s)
- Dawanne E Poree
- Department of Chemistry, Rutgers University, Piscataway, New Jersey 08854, USA
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16
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Lu LL, Tian SK, Yang XE, Peng HY, Li TQ. Improved cadmium uptake and accumulation in the hyperaccumulator Sedum alfredii: the impact of citric acid and tartaric acid. J Zhejiang Univ Sci B 2013; 14:106-14. [PMID: 23365009 PMCID: PMC3566403 DOI: 10.1631/jzus.b1200211] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Accepted: 01/17/2013] [Indexed: 11/11/2022]
Abstract
The elucidation of a natural strategy for metal hyperaccumulation enables the rational design of technologies for the clean-up of metal-contaminated soils. Organic acid has been suggested to be involved in toxic metallic element tolerance, translocation, and accumulation in plants. The impact of exogenous organic acids on cadmium (Cd) uptake and translocation in the zinc (Zn)/Cd co-hyperaccumulator Sedum alfredii was investigated in the present study. By the addition of organic acids, short-term (2 h) root uptake of (109)Cd increased significantly, and higher (109)Cd contents in roots and shoots were noted 24 h after uptake, when compared to controls. About 85% of the (109)Cd taken up was distributed to the shoots in plants with citric acid (CA) treatments, as compared with 75% within controls. No such effect was observed for tartaric acid (TA). Reduced growth under Cd stress was significantly alleviated by low CA. Long-term application of the two organic acids both resulted in elevated Cd in plants, but the effects varied with exposure time and levels. The results imply that CA may be involved in the processes of Cd uptake, translocation and tolerance in S. alfredii, whereas the impact of TA is mainly on the root uptake of Cd.
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Affiliation(s)
- Ling-li Lu
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
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17
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Faller RV, Eversole SL. Enamel protection from acid challenge--benefits of marketed fluoride dentifrices. J Clin Dent 2013; 24:25-30. [PMID: 23547491] [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: 06/02/2023]
Abstract
OBJECTIVE To determine the ability of various marketed dentifrices containing stabilized stannous fluoride (SnF2), sodium fluoride (NaF), or sodium monofluorophosphate (SMFP) to protect enamel against the earliest stages of erosive dietary acid damage using an in vitro enamel protection model. METHODS Acid-challenged, extracted human teeth were treated with a 1:3 dilution of dentifrice, rinsed, and then challenged in a controlled series of tests using four dietary acids considered potentially erosive to teeth. Each acid was collected and analyzed to determine the level of mineral (phosphorous) removed from the teeth during the challenge. Post-treatment results were compared to baseline values for each acid. Results for the four acids were averaged and reported as an average percent protection value for each of the dentifrices tested, with higher values representing greater acid protection. The study included six dentifrices formulated with (A) sodium fluoride (NaF), (B) stabilized stannous fluoride (SnF2), (C,D) NaF plus 5% potassium nitrate (KNO3), (E) sodium monofluorophosphate (SMFP), or (F) SMFP plus 8% arginine bicarbonate. RESULTS The stabilized SnF2 dentifrice demonstrated an average protection score of 39.3%, while products formulated with NaF resulted in protection scores between 11 and 13%. The SMFP dentifrice was rated at -3.5%, and the SMFP + arginine bicarbonate dentifrice resulted in a net average score of -5.0%. Results of this test were statistically significant (p < 0.05, ANOVA: B > A = C = D > E = F), in favor of the stabilized SnF2 dentifrice. CONCLUSIONS These results suggest the stabilized SnF2 dentifrice has the potential to provide significantly better overall acid protection versus any of the other dentifrices included in the study.
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Affiliation(s)
- R V Faller
- Maurice H. Kornberg School of Dentistry, Philadelphia, PA, USA
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18
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Abstract
We hypothesized that the formation and differentialtion of osteoclasts are accelerated and the potential of bone resorption is increased in the hemiplegic bone marrow in the early stage of stroke. We randomly divided white female Sprague-Dawley (SD) rats (n = 30) into two groups, stroke (n = 15) and sham group (n = 15). On the 7th day after stroke, after cutting away the epiphyses of the femurs and tibias, diaphyseal channels were flushed using α-minimum essential medium (α-MEM) and bone marrow cells were collected. Bone marrow stem cells, which were extracted from the femur and tibia, were cultured on the 7th day after middle cerebral artery occlusion. We then estimated the ratio of non-adherent cells to total bone marrow cells that included osteoclast precursor cells. After culturing these cells separately, cells that tested positive on the tartrate resistant acid phosphatase (TRAP) were counted and bone resorption was evaluated by using the OAAS™ plate. In comparison to the control group, the stroke group showed a higher increase of non-adherent cells in the hemiplegic side bone marrow. In addition, after the primary culture, the stroke group showed an increased number of TRAP positive cells and a higher degree of bone resorption estimated by OAAS™ plate. As a result, osteoclastogenesis and osteoclast differentiation are accelerated and the potential of bone resorption is increased in the hemiplegic bone marrow and these changes are detected as early as within the first week after middle cerebral artery occlusion in SD rats.
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Affiliation(s)
- Myung Eun Chung
- Department of Rehabilitation Medicine, St. Paul's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Jong In Lee
- Deparment of Rehabilitation Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Sun Im
- Deparment of Rehabilitation Medicine, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea
| | - Joo Hyun Park
- Deparment of Rehabilitation Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
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19
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Zou WW, Wang DH, Sun CY, Han JB, Yin Q, Yang QM, Wang JY. [Characterization of vinflunine tartrate liposomes in vitro and in vivo]. Yao Xue Xue Bao 2011; 46:1515-1519. [PMID: 22375428] [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: 05/31/2023]
Abstract
Vinflunine tartrate-loaded liposomes (VT-L) with two drug-to-lipid ratios were prepared by pH gradient method. Vesicle size and zeta potential were determined by the Zetasizer Nano ZS. Entrapment efficiency was evaluated by cation exchange resin centrifugalization method. The toxicity and tumor inhibition to nude mouse administrated by VT-L with different drug-to-lipid ratios were investigated and compared with the vinflunine tartrate injection (VT-I). The results showed that the mean particle size, zeta potential and entrapment efficiency of the VT-L with drug-to-lipid ratios of 1 : 5 and 1 : 10 were 124.6 nm and 128.3 nm, -25.3 mV and -22.8 mV, 94.46% and 97.31%, respectively. The VT-L with two different drug-to-lipid ratios has significantly higher anti-tumor effect to nude mouse transplanted human non-small cell lung carcinoma A549 and lower toxicity than VT-I. While there were no significant differences in anti-tumor effect and toxicity between VT-L with two different drug-to-lipid ratios.
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Affiliation(s)
- Wei-Wei Zou
- Shandong Provincial Key Laboratory of Microparticle Drug Delivery Technology, Jinan 250100, China
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20
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Wang H, Zhong G. Effect of organic ligands on accumulation of copper in hyperaccumulator and nonaccumulator Commelina communis. Biol Trace Elem Res 2011; 143:489-99. [PMID: 20842463 DOI: 10.1007/s12011-010-8850-7] [Citation(s) in RCA: 20] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2009] [Accepted: 09/07/2010] [Indexed: 11/30/2022]
Abstract
Better understanding of copper uptake and accumulation regulation in plants is critical to the phytoremediation of copper contaminated soil. This study employed a 30-day pot experiment to assess the relationship between organic ligands and copper accumulation in plants. Hyperaccumulator and nonaccumulator varieties of Commelina communis were used, different organic ligands were applied, and the data of copper accumulation in shoots were collected. The six organic ligands included ethylenediaminetetraacetic acid and organic acids (formic acid, citric acid, malic acid, tartaric acid, and succinic acid). The results showed that organic ligands added to culture increased the copper accumulation both varieties. The results of the copper accumulation in shoots agreed with the study of the root uptake kinetics of copper influx. The addition of organic acids could increase copper accumulation in shoots because the copper influx in roots was increased. The results also indicated that the copper influx of hyperaccumulator roots was higher than that of nonaccumulator roots. This is one of the mechanisms by which a hyperaccumulator could amass large amounts of copper in its shoots. In this accumulation process, little effect on the leaf relative water content was in the hyperaccumulator and nonaccumulator of leaves and normal physiological condition of plants.
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Affiliation(s)
- Haiou Wang
- Department of Biological Science and Engineering, School of Chemical and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
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21
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Bala R, Thukral AK. Phytoremediation of Cr(VI) by Spirodela polyrrhiza (L.) Schleiden employing reducing and chelating agents. Int J Phytoremediation 2011; 13:465-91. [PMID: 21598777 DOI: 10.1080/15226511003758861] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Phytoremediation of Cr(VI) by Spirodela polyrrhiza in binary combinations with low molecular weight organic compounds (LMWOCs) with a reducing or chelating potential, viz., ascorbic acid, citric acid, tartaric acid, oxalic acid, lactic acid, and glycerol was studied in Cr(VI) containing hydroponic media. Significant increase in the relative dry weight of plants with respect to Cr(VI) treated controls was observed with ascorbic acid and glycerol. The uptake of chromium by S. polyrrhiza followed Michaelis-Menten kinetics of active ion uptake. Interaction between Cr and ascorbic acid, oxalic acid, and lactic acid decreased Cr uptake, whereas citric acid, glycerol, and tartaric acid increased it. Supplementation of LMWOCs to Cr(VI) containing media decreased the MDA content of the plants. Multiple regression models revealed that LMWOCs decrease lipid peroxidation independently, as well as that induced by Cr(VI). It was found that superoxide dismutase (SOD), guaiacol peroxidase (GPX), and catalase (CAT) activities were increased significantly in plants growing in media containing Cr(VI). The study established that lactic acid, citric acid, ascorbic acid, and glycerol were most effective in increasing the Cr(VI) phytoremediating potential of S. polyrrhiza and LMWOCs with reducing or chelating properties decrease Cr(VI) stress in S. polyrrhiza.
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Affiliation(s)
- Rajni Bala
- Department of Botanical & Environmental Sciences, Guru Nanak Dev University, Amritsar, India
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22
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Doumett S, Fibbi D, Azzarello E, Mancuso S, Mugnai S, Petruzzelli G, Del Bubba M. Influence of the application renewal of glutamate and tartrate on Cd, Cu, Pb and Zn distribution between contaminated soil and Paulownia tomentosa in a pilot-scale assisted phytoremediation study. Int J Phytoremediation 2011; 13:1-17. [PMID: 21598764 DOI: 10.1080/15226510903567455] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The influence of repeated applications of tartrate (TAR) and glutamate (GLU) at 50-mmol kg(-1) of soil on Cd, Cu, Pb, and Zn distribution between a contaminated soil and Paulownia tomentosa was investigated. TAR and GLU were applied by a single or a double dosage, the latter carried out with an interval between the two applications of thirty days. The comparison of the differences in mean amounts of metals accumulated in the whole plant at the end of single and double TAR and GLU application experiments indicated the positive effect of repeated GLU applications on the accumulation of Cu, Pb, and Zn by Paulownia tomentosa as compared to untreated controls. A similar effect was not observed for the TAR treatments. When soil treated with either TAR or GLU was compared with untreated controls, no significant effect on heavy-metal concentrations in the soil solution was observed 30 days after treatment, suggesting the absence of an increase of the long-term leaching risk of heavy metals in aquifers and surface waters due to the ligand application. A cost analysis of the treatment is also reported.
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Affiliation(s)
- S Doumett
- University of Florence, Department of Chemistry, Sesto Fiorentino, Florence, Italy
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Nakipova OV, Averin AS, Zakharova NM, Uchitel' ML, Grishina EV, Bogdanova LA, Maevskiĭ EI. [The role of energy substrates in regulation of the force-frequency relationship in the rat myocardium: effect of ambiocor]. Biofizika 2010; 55:1124-1131. [PMID: 21268359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The effect of ambiocor (15 mg/100 ml), which contains natural substrates of energy metabolism, on the contractility of papillary muscles (PM) of the right ventricle of the rat heart was studied at stimulation frequencies from 0.1 to 3.0 Hz at a temperature of 30 +/- 1 degrees C (n = 7). The effect was recorded 20 min after the addition of the preparation. It was demonstrated that ambiocor causes a significant (about 70%), independent of stimulation frequency, suppression of the amplitude of isometric contractions (negative inotropic effect), which is coupled with an increase in the relative value of the rest potentiation effect (a qualitative index of calcium content in sarcoplasmic reticulum). The influence of the mixture leads to significant alterations in the time parameters of the "contraction-relaxation" cycle: an increase in the duration of latent period; and a decrease in the time to peak tension and half-relaxation time (TR50%). The effect of the mixture is partially reversible. During the washing of the preparation with the control solution, the qualitative indicators of the contractile activity of papillary muscles are substantially improved in comparison with the initial ones. The character of alterations allows one to assume that the effect of ambiocor in the papillary muscles of the rat heart is realized partly through the suppression of the activity of sarcolemmal calcium channels.
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Sinkó B, Pálfi M, Béni S, Kökösi J, Takács-Novák K. Synthesis and characterization of long-chain tartaric acid diamides as novel ceramide-like compounds. Molecules 2010; 15:824-33. [PMID: 20335949 PMCID: PMC6256927 DOI: 10.3390/molecules15020824] [Citation(s) in RCA: 11] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Revised: 02/01/2010] [Accepted: 02/03/2010] [Indexed: 11/16/2022] Open
Abstract
Ceramides play a crucial role in the barrier function of the skin as well as in transmembrane signaling. In this study long aliphatic chain tartaric acid diamides able to replace ceramides in an in vitro model of the stratum corneum lipid matrix due to their similar physico-chemical properties were synthesized from diacetoxysuccinic anhydride in four steps. Their pro-apoptotic effect on fibroblast cells was also investigated.
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Affiliation(s)
- Bálint Sinkó
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes E.u.9., Budapest H-1092, Hungary; E-Mails: (B.S.); (S.B.); (J.K.)
| | - Melinda Pálfi
- Department of Pharmacodynamics, Semmelweis University, Nagyvárad tér 4., Budapest H-1089, Hungary; E-Mail: (M.P.)
| | - Szabolcs Béni
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes E.u.9., Budapest H-1092, Hungary; E-Mails: (B.S.); (S.B.); (J.K.)
| | - József Kökösi
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes E.u.9., Budapest H-1092, Hungary; E-Mails: (B.S.); (S.B.); (J.K.)
| | - Krisztina Takács-Novák
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes E.u.9., Budapest H-1092, Hungary; E-Mails: (B.S.); (S.B.); (J.K.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +36-1-215-5241; Fax: +36-1-217-0891
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Gahmberg CG, Simons K. Characterization of the acid phosphatase activity in the plasma membrane fraction from baby hamster kidney cells (BHK21). Acta Pathol Microbiol Scand B Microbiol Immunol 2009; 78:451-8. [PMID: 5274410 DOI: 10.1111/j.1699-0463.1970.tb04327.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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JACOBSSON K. On the Inhibition of Prostatic Phosphatase BY Tartrate. Scandinavian Journal of Clinical and Laboratory Investigation 2009; 11:358-60. [PMID: 14406425 DOI: 10.3109/00365515909060465] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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27
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Jyothi Lakshmi A, Gupta S, Prakash J. Comparative analysis of influence of promoters and inhibitors onin vitroavailable iron using two methods. Int J Food Sci Nutr 2009; 57:559-69. [PMID: 17162335 DOI: 10.1080/09515070601043328] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [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: 10/23/2022]
Abstract
The investigation was undertaken with the objective of comparing two in vitro techniques, measuring dialyzable iron (method A) and measuring ionizable iron (method B), for iron bioavailability in a model system. The effect of the time of introduction of the additives on the available iron was also determined. FeSO4 solution was used as the reference source of iron, to which a series of enhancers (ascorbic acid, citric acid, maleic acid and tartaric acid) and inhibitors (tannic acid, calcium oxalate, oxalic acid, calcium carbonate and sodium phytate) were added individually at various concentrations, and available iron was estimated. From FeSO4 solution, 0.1% (method A) and 3.9% (method B) of iron was available. The addition of ascorbic acid, citric acid and tartaric acid increased this by 33-50%, 28-57% and 23-90%, respectively, for method A and by 15-89%, 24-78% and 24-93% for method B. Tannic acid, sodium phytate and calcium oxalate exhibited an inhibitory effect irrespective of the concentrations, while oxalic acid and calcium carbonate exhibited a dose-dependent inhibitory pattern. The iron availability analyzed by both methods showed a positive correlation with seven out of nine additives. An inverse relation was seen between the inhibitory effect of calcium carbonate and calcium oxalate and their time of introduction into the system. The overall observations showed that although absolute values varied widely, a positive correlation existed between the methods.
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Affiliation(s)
- A Jyothi Lakshmi
- Department of Studies in Food Science and Nutrition, Manasagangothri, University of Mysore, Mysore, India
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Doumett S, Lamperi L, Checchini L, Azzarello E, Mugnai S, Mancuso S, Petruzzelli G, Del Bubba M. Heavy metal distribution between contaminated soil and Paulownia tomentosa, in a pilot-scale assisted phytoremediation study: influence of different complexing agents. Chemosphere 2008; 72:1481-1490. [PMID: 18558420 DOI: 10.1016/j.chemosphere.2008.04.083] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2008] [Revised: 04/26/2008] [Accepted: 04/29/2008] [Indexed: 05/26/2023]
Abstract
The distribution of Cd, Cu, Pb and Zn between a contaminated soil and the tree species Paulownia tomentosa was investigated in a pilot-scale assisted phytoremediation study. The influence of the addition of EDTA, tartrate and glutamate at 1, 5 and 10mM concentrations on metal accumulation by the plant and on metal mobilization in soil was evaluated. Root/shoot metal concentration ratios were in the range of 3-5 for Zn, 7-17 for Cu, 9-18 for Cd and 11-39 for Pb, depending on the type and concentration of complexing agent. A significant enhancement of metal uptake in response to complexing agent application was mainly obtained in roots for Pb (i.e. 359 mg kg(-1) for EDTA 10mM and 128 mg kg(-1) for the control), Cu (i.e. 594 mg kg(-1) for glutamate 10mM and 146 mg kg(-1) for the control) and, with the exception of glutamate, also for Zn (i.e. 670 mg kg(-1) for tartrate 10mM and 237 mg kg(-1) for the control). Despite its higher metal mobilization capacity, EDTA produced a metal accumulation in plants quite similar to those obtained with tartrate and glutamate. Consequently the concentration gradient between soil pore water and plant tissues does not seem to be the predominant mechanism for metal accumulation in Paulownia tomentosa and a role of the plant should be invoked in the selection of the chemical species taken up. Metal bioavailability in soil at the end of the experiment was higher in the trials treated with EDTA than in those treated with tartrate and glutamate, the latter not being significantly different from the control. These findings indicated the persistence of a leaching risk associated to the use of this chelator, while an increase of the environmental impact is not expected when glutamate and tartrate are applied.
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Affiliation(s)
- S Doumett
- University of Florence, Department of Chemistry, Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
| | - L Lamperi
- University of Florence, Department of Chemistry, Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
| | - L Checchini
- University of Florence, Department of Chemistry, Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
| | - E Azzarello
- University of Florence, Department of Horticulture, Viale delle Idee 30, 50019 Sesto Fiorentino, Florence, Italy
| | - S Mugnai
- University of Florence, Department of Horticulture, Viale delle Idee 30, 50019 Sesto Fiorentino, Florence, Italy
| | - S Mancuso
- University of Florence, Department of Horticulture, Viale delle Idee 30, 50019 Sesto Fiorentino, Florence, Italy
| | - G Petruzzelli
- National Research Council, Institute of Ecosystem Study, Research Unit of Pisa, Via Moruzzi 1, 56124 Pisa, Italy
| | - M Del Bubba
- University of Florence, Department of Chemistry, Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy.
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Yosef S, Brodsky M, Sredni B, Albeck A, Albeck M. Octa-O-bis-(R,R)-Tartarate Ditellurane (SAS)—a Novel Bioactive Organotellurium(IV) Compound: Synthesis, Characterization, and Protease Inhibitory Activity. ChemMedChem 2007; 2:1601-6. [PMID: 17680580 DOI: 10.1002/cmdc.200700155] [Citation(s) in RCA: 26] [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: 02/02/2023]
Abstract
Octa-O-bis-(R,R)-Tartarate Ditellurane (SAS) is a new Te(IV) compound, comprised of two tellurium atoms, each liganded by four oxygen atoms from two carboxylates and two alkoxides of two tartaric acids. Unlike many other Te(IV) compounds, SAS was highly stable in aqueous solution. It interacted with thiols to form an unstable Te(SR)(4) product. The product of the interaction of SAS with cysteine was isolated and characterized by mass spectroscopy and elemental analysis. SAS selectively inactivated cysteine proteases, but it did not inactivate other families of proteolytic enzymes. It displayed selectivity towards the cysteine protease cathepsin B, a human enzyme of pharmaceutical interest, with a second order rate constant k(i)/K(i)=5900 M(-1) s(-1).
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Affiliation(s)
- Sigal Yosef
- Department of Chemistry, Bar Ilan University, Ramat Gan 52900, Israel
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30
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Atoui A, Mitchell D, Mathieu F, Magan N, Lebrihi A. Partitioning of ochratoxin A in mycelium and conidia ofAspergillus carbonariusand the impact on toxin contamination of grapes and wine. J Appl Microbiol 2007; 103:961-8. [PMID: 17897199 DOI: 10.1111/j.1365-2672.2007.03320.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [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
AIMS Aspergillus carbonarius is an important ochratoxin A (OTA)-producing fungus which is responsible for toxin contamination of grapes and wine. The objectives of this study were to examine the partitioning of OTA in mycelium and conidia of a range of A. carbonarius strains on artificial grape juice and defined media, to determine the excretion patterns of OTA from these spores, and the effect of organic acids used in wine production on OTA excretion from conidia. METHODS AND RESULTS The results showed that 60-70% of the OTA was accumulated in the conidia of a number of different isolates of A. carbonarius. Calculations showed that on different defined media, an amount of 0.011- to 0.1-pg OTA was present per conidium. The OTA in spores was found to be rapidly excreted into the medium during the initial few hours after conidial germination leading to an increase of OTA in must during maceration for wine production. The presence of tartaric acid inhibited OTA production, but malic acid enhanced this production during mycelial growth. These acids were also shown to affect the time course of germination and the rate of OTA excretion from conidia during germination. CONCLUSIONS This study is the first to examine and show the partitioning of OTA into spores of strains of A. carbonarius and that rapid excretion of OTA from spores could be a reason for OTA accumulation in musts during wine production. SIGNIFICANCE AND IMPACT OF THE STUDY Conidia of A. carbonarius could be a major source of OTA contamination of grapes used in wine production. This information could help in the development of effective prevention strategies to minimize wine contamination with this important mycotoxin.
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Affiliation(s)
- A Atoui
- Département Bioprocédés et Systèmes Microbiens, Laboratoire de Génie Chimique UMR5503 (CNRS/INPT/UPS), Ecole Nationale Supérieure Agronomique de Toulouse, Institut National Polytechnique de Toulouse, Castanet Tolosan, France
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31
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Cui S, Zhou QX, Wei SH, Zhang W, Cao L, Ren LP. Effects of exogenous chelators on phytoavailability and toxicity of Pb in Zinnia elegans Jacq. J Hazard Mater 2007; 146:341-6. [PMID: 17254705 DOI: 10.1016/j.jhazmat.2006.12.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2006] [Revised: 12/10/2006] [Accepted: 12/11/2006] [Indexed: 05/13/2023]
Abstract
Chelate-enhanced phytoremediation is considered as an effective method for the extraction of lead (Pb) by plants. However, more detailed studies are needed to evaluate the effect of exogenous chelators on phytoavailability and toxicity of Pb in plants, then to find out the proper applied concentration of chelators to minimize the combined toxicity to the plants and maximize phytoavailable Pb. To clarify these questions, the seed germination test of Zinnia elegans Jacq. exposed to solutions containing Pb and four types of chelators including sodium ethylenediamine tetra-acetic acid (Na2EDTA), oxalic acid, tartaric acid and citric acid was observed. The results showed that the roots and shoots treated with equimolar chelators and Pb were longer than those treated with half and two folds of the molar concentrations of Pb. The growth of seedlings was inhibited by surplus addition of chelators, and the toxicity of complexes was less than that of Pb and chelators. In particular, 2.4 mM EDTA and 1.2 mM oxalic acid significantly (P<0.05) increased Pb uptake when the seeds were treated with 2.4 mM Pb. In the 4.8 mM Pb solution, Pb accumulation in the seedlings was markedly (P<0.05) increased by 4.8 mM EDTA, 2.4 mM tartaric acid, 4.8 mM tartaric acid and 2.4 mM citric acid, and amounted to 6752.4, 6453.8, 6541.4 and 6598.3 microg g(-1), respectively. With the superfluous addition of chelators, Pb accumulation in the seedlings decreased in a concentration-dependent manner. When Pb was used at 2.4 mM, an equimolar concentration of EDTA not only increased Pb uptake but also stimulated the seedling growth. Thus, chelating agents in their appropriately concentrations could counteract Pb toxicity, but superfluous chelators resulted in less Pb uptake and growth inhibition of the seedlings.
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Affiliation(s)
- Shuang Cui
- Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
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32
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Soares-Schanoski A, Gómez-Piña V, del Fresno C, Rodríguez-Rojas A, García F, Glaría A, Sánchez M, Vallejo-Cremades MT, Baos R, Fuentes-Prior P, Arnalich F, López-Collazo E. 6-Methylprednisolone down-regulates IRAK-M in human and murine osteoclasts and boosts bone-resorbing activity: a putative mechanism for corticoid-induced osteoporosis. J Leukoc Biol 2007; 82:700-9. [PMID: 17576820 DOI: 10.1189/jlb.1106673] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [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: 01/27/2023] Open
Abstract
Osteoclasts are large, multinucleated cells, which originate from the fusion of macrophages. They play a central role in bone development and remodeling via the resorption of bone and are thus important mediators of bone loss, which leads to osteoporosis. IL-1R-associated kinase (IRAK)-M is a pseudokinase, which acts as a negative modulator of innate immune responses mediated by TLRs and IL-1R. Recently, it has been reported that IRAK-M also participates in the control of macrophage differentiation into osteoclasts. In addition, it was shown that IRAK-M knockout mice develop a strong osteoporosis phenotype, suggesting that down-regulation of this molecule activates osteoclast-mediated bone resorption. We studied the effect of the osteoporosis-inducing glucocorticoid, 6-methylprednisolone (6-MP), on IRAK-M expression in osteoclasts. Our results showed that osteoclasts, derived from THP-1 and RAW cells as well as human blood monocytes, differentiated into osteoclasts, express high levels of IRAK-M at mRNA and protein levels. In addition, 6-MP down-regulates IRAK-M expression, which correlates with an increased activation of bone resorption. These findings suggest a mechanism of corticosteroid-induced osteoporosis and open new avenues for treating this endemic disease of Western societies.
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33
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Kakinoki S, Taguchi T. Antitumor effect of an injectable in-situ forming drug delivery system composed of a novel tissue adhesive containing doxorubicin hydrochloride. Eur J Pharm Biopharm 2007; 67:676-81. [PMID: 17493793 DOI: 10.1016/j.ejpb.2007.03.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2007] [Revised: 03/22/2007] [Accepted: 03/24/2007] [Indexed: 10/23/2022]
Abstract
Our group has developed a novel tissue adhesive composed of biomacromolecules and organic acid derivatives which have good biocompatibility and exhibit high bonding strength to living tissues. We propose to use this tissue adhesive for in-situ forming drug delivery system (DDS) for cancer chemotherapy. In a previous work, we had prepared a novel in-situ forming DDS composed of human serum albumin (HSA) and tartaric acid derivative (TAD) containing doxorubicin hydrochloride (DOX), and we had demonstrated an in vitro release profile of DOX from HSA-TAD gel for approximately up to 100h. Here, we report on antitumor effect of this injectable in-situ forming DDS. Local injection of DOX by the HSA-TAD was administered to human colon carcinoma (WiDr) implanted subcutaneously onto the immunodeficient mouse. The results of the in vivo experiments showed that the presence of DOX in blood of mice was detectable for up to 3days, and that the tumor volume was effectively minimized with injection of HSA-TAD containing DOX. The in-situ forming DDS with the novel tissue adhesive containing DOX, therefore, is a useful technique for cancer chemotherapy.
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Affiliation(s)
- Sachiro Kakinoki
- Biomaterials Center, National Institute for Materials Science, Tsukuba, Japan
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34
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Spiering BA, Kraemer WJ, Vingren JL, Hatfield DL, Fragala MS, Ho JY, Maresh CM, Anderson JM, Volek JS. RESPONSES OF CRITERION VARIABLES TO DIFFERENT SUPPLEMENTAL DOSES OF L-CARNITINE L-TARTRATE. J Strength Cond Res 2007; 21:259-64. [PMID: 17313301 DOI: 10.1519/00124278-200702000-00046] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [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: 11/08/2022]
Abstract
L-carnitine L-tartrate (LCLT) supplementation beneficially affects markers of postexercise metabolic stress and muscle damage. However, to date, no study has determined the dose response of LCLT to elicit such responses. Therefore, the purpose of this study was to determine the effects of different doses of LCLT on criterion variables previously shown to be responsive to LCLT supplementation. Eight healthy men (22 +/- 3 y, 174 +/- 5 cm, 83.0 +/- 15.3 kg) were supplemented with 0 g, 1 g, and 2 g of LCLT for 3 weeks and then performed a bout of resistance exercise (5 sets of 15-20 repetition maximum with a 2-min rest between sets) with associated blood draws. This procedure was performed in a balanced, randomized, repeated measures design. Serum carnitine concentrations increased (p < or = 0.05) following the 1 g and 2 g doses, with the 2-g dose providing the highest carnitine concentrations. The 1- and 2-g doses reduced postexercise serum hypoxanthine, serum xanthine oxidase, serum myoglobin, and perceived muscle soreness. In conclusion, both the 1- and 2-g doses were effective in mediating various markers of metabolic stress and of muscle soreness. Use of LCLT appears to attenuate metabolic stress and the hypoxic chain of events leading to muscle damage after exercise.
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Affiliation(s)
- Barry A Spiering
- Department of Kinesiology, University of Connecticut, Storrs 06269, USA
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35
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Sethumadhavan R, Taguchi T, Tanaka J, Tateishi T. Investigations on the interaction of tartaric acid derivative/human serum albumin tissue adhesive with J774A.1 mouse macrophage cells through SEM, IL-6 cytokine and gene expression techniques. Biomed Mater Eng 2007; 17:209-17. [PMID: 17611296] [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: 05/16/2023]
Abstract
We developed a novel tissue adhesive consisting of human serum albumin (HSA) and tartaric acid derivative (TAD). Four different concentrations of TAD namely, 0.05 mM, 0.1 mM, 0.2 mM and 0.3 mM were mixed with 40%, 42% and 44% HSA individually and were made in the form of disks. J774A.1 mouse macrophage cells were seeded on top of these disks. The disks were pre-treated with sterile water and Eagle's medium before every seeding. All the seeding was incubated from 1 day to 3 days before making any investigations on it. SEM images were recorded and it was observed that these cells adhered to these materials very well. Mouse IL-6 cytokine expressions were studied using ELISA. It was seen from the cytokine expression results that the release of IL-6 was minimum at 0.3 mM TAD concentrations with 44% HSA disks. No significant difference was observed in the cytokine expressions of IL-6 at 42% and 44% HSA at all concentrations of TAD studied in this work. mRNA gene expressions of IL-6 were investigated using RT-PCR technique. In 40% HSA, the gene expression level of IL-6 gene did not change during 3-day-culture in the range of TAD concentration of 0.05 mmol to 0.2 mmol. However, 0.3 mM TAD suppressed the gene expression at all concentration of HSA. In 42% HSA, although 0.05 mM and 0.1 mM TAD did not affect the gene expression, 0.2 mM and 0.3 mM TAD induced the expression level with incubation time. In 44% HSA, all the concentration of TAD increased the expression level even though the cytokine expression levels were quite low. Hence it could be thought that the expression at the cytokine level is quite insignificant where as it is to be considered at the gene expression level. On the whole, 0.3 mM TAD with 44% HSA could be considered as a challenging material as a tissue adhesive material for use in the field of tissue engineering.
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Affiliation(s)
- Rao Sethumadhavan
- Biomaterial Center, National Institute for Material Sciences, Ibaraki, Japan.
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36
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Abstract
For drug absorption, intestinal drug permeability's through both the paracellular and transcellular routes were analyzed. Absorption enhancers, such as sodium caprate (C10), decanoylcarnitine (DC) and tartaric acid (TA), increased the paracellular permeability of water-soluble, low lipophilic and poorly absorbable drugs by enlargement of tight junction (TJ) adhering to the intercellular portion; that is, expansion of the paracellular routes. C10 increased the intracellular calcium level to induce contraction of calmodulin-dependent actin filaments. Although DC also increased the intracellular calcium level, the action was independent of calmodulin, and thus the action mechanism of DC was considered to differ from that of C10. DC and TA decreased the intracellular ATP level and the intracellular pH, suggesting that intracellular acidosis increases the calcium level through decrease in ATP level followed by opening TJ. TA had no effect on Western blot analysis, but TA significantly inhibited excretion of rhodamine 123, one of the P-glycoprotein (P-gp) substrates, from the serosal to mucosal side, suggesting that TA increases the intestinal absorption of P-gp substrates, possibly by inhibiting the P-gp function without changing the expression of P-gp. During ischemia/reperfusion (I/R) injury during small intestine grafting, TJ opening and decrease in P-gp function simultaneously occurred. The in vitro model of I/R showed that lipid peroxidation is a trigger of the injury, and superoxide and iron ion participate in TJ opening and decrease in P-gp function. Colonic epithelial cells have the specific transcellular transport systems for lipopolysaccharide (LPS), one of which shows substrate specificity in the interaction with CD14 and/or that of TLR4. In the infective disease induced by LPS, the mucosal LPS sensitive transport capability was decreased and in the secretory direction, the receptor-mediated uptake mechanism disappeared. LPS taken up into the cells can be excreted by P-gp or mrp. The expression levels and function of the secretory transporters were considered to be increased in the infective condition. In conclusion, changes in TJ as the membrane structure and P-gp as the membrane function are important factors controlling intestinal membrane transport.
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Affiliation(s)
- Masahiro Hayashi
- Department of Drug Absorption and Pharmacokinetics, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Japan.
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37
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Shiowatana J, Purawatt S, Sottimai U, Taebunpakul S, Siripinyanond A. Enhancement effect study of some organic acids on the calcium availability of vegetables: application of the dynamic in vitro simulated gastrointestinal digestion method with continuous-flow dialysis. J Agric Food Chem 2006; 54:9010-6. [PMID: 17117785 DOI: 10.1021/jf062073t] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The effect of added organic acids on the calcium availability of vegetables was investigated using the dialysis profiles obtained from an in vitro simulated gastrointestinal digestion with continuous-flow dialysis method. Citric acid was the most effective enhancer followed by tartaric, malic, and ascorbic acids. For amaranth, which has a low calcium availability (5.4%), a significant increase of availability was observed with increasing concentrations of all acids studied. With the continuous-flow dialysis approach, organic acids could be observed to promote the dialyzability even at an elevated intestinal pH. An enhancement effect from added organic acids was not clearly observed for Chinese kale, which itself contains a high amount of available calcium (52.9%).
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Affiliation(s)
- Juwadee Shiowatana
- Department of Chemistry, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand
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38
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Strasser A, Dedoyard A, Lohninger A, Niedermüller H. L-Carnitine L-tartrate (LCLT) and dehydroepiandrosterone sulfate (DHEAS) affect red and white blood cells in aged Sprague-Dawley rats. Arch Gerontol Geriatr 2006; 44:325-36. [PMID: 16930745 DOI: 10.1016/j.archger.2006.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2005] [Revised: 06/20/2006] [Accepted: 07/10/2006] [Indexed: 10/24/2022]
Abstract
Supplementation with either L-carnitine or DHEAS was separately suggested to counteract age-related declines. However, little is known about any interactive effects of these substances, independently promoting mitochondrial energy metabolism, in older individuals. We thus studied the effects of 3 months of daily oral combined supplementation with LCLT and DHEAS on red (RBCs) and white blood cells (WBCs) in male Sprague-Dawley rats by determining RBC and WBC counts, lymphocyte proliferation and interleukin-2 (IL-2) synthesis in spleen lymphocytes after Concanavalin A (ConA) stimulation. Supplementation with LCLT in addition to DHEAS decreased RBCs and increased platelets in the blood of 25-month-old Sprague-Dawley rats, whereas supplementation with DHEAS alone shifted the balance from segmented neutrophile granulocytes to large lymphocytes in differential WBC counts. Based on these results, interactive effects of supplementation with L-carnitine and DHEAS on RBCs and platelets are suggested.
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Affiliation(s)
- Alois Strasser
- Institute of Physiology, Department of Natural Sciences, University of Veterinary Medicine Vienna, Veterinärplatz 1, A-1210 Wien, Austria.
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39
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Abstract
Functional characterization of unknown genes is currently a major task in biology. The search for gene function involves a combination of various in silico, in vitro and in vivo approaches. Available knowledge from the study of more than 21 LysR-type regulators in Escherichia coli has facilitated the classification of new members of the family. From sequence similarities and its location on the E. coli chromosome, it is suggested that ygiP encodes a lysR regulator controlling the expression of a neighbouring operon; this operon encodes the two subunits of tartrate dehydratase (TtdA, TtdB) and YgiE, an integral inner-membrane protein possibly involved in tartrate uptake. Expression of tartrate dehydratase, which converts tartrate to oxaloacetate, is required for anaerobic growth on glycerol as carbon source in the presence of tartrate. Here, it has been demonstrated that disruption of ygiP, ttdA or ygjE abolishes tartrate-dependent anaerobic growth on glycerol. It has also been shown that tartrate-dependent induction of the ttdA-ttdB-ygjE operon requires a functional YgiP.
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Affiliation(s)
- Taku Oshima
- Graduate School of Information Science, Nara Institute of Science and Technology, Nara 630-0101, Japan
| | - Francis Biville
- Unité des Membranes Bactériennes, Département de Microbiologie Fondamentale et Médicale, Institut Pasteur, 25 rue du Dr Roux, F75724 Paris cedex 15, France
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40
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Takatsuka S, Kitazawa T, Morita T, Horikiri Y, Yoshino H. Enhancement of intestinal absorption of poorly absorbed hydrophilic compounds by simultaneous use of mucolytic agent and non-ionic surfactant. Eur J Pharm Biopharm 2006; 62:52-8. [PMID: 16289777 DOI: 10.1016/j.ejpb.2005.07.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2005] [Revised: 07/27/2005] [Accepted: 07/27/2005] [Indexed: 11/19/2022]
Abstract
The effect of co-administration of a mucolytic agent with a penetration enhancer was assessed on the intestinal absorption of poorly absorbed hydrophilic compounds. Fluorescein isothiocyanate-labeled dextran with average molecular weight of ca. 4.4 kDa (FD-4) was used as a model compound, and N-acetylcysteine (NAC) was used as a mucolytic agent. Sodium caprate (C10), tartaric acid (TA), sodium taurodeoxycholate (TDC), sodium dodecyl sulfate (SDS), p-t-octyl phenol polyoxyethylene-9.5 (Triton X-100, TX-100) were selected as penetration enhancers with different mechanisms of action. Various dosing solutions containing a penetration enhancer in the absence or in the presence of NAC were directly administered into the exposed rat jejunum, and the bioavailability of FD-4 up to 2 h was determined. The extent of improvement by co-administration was highly dependent on the penetration enhancer species applied. The observed enhancement was thought to result from the mucolytic activity of NAC, which can reduce the mucus viscosity and facilitate the penetration of FD-4 to mucosal membrane. Among the combinations tested, the simultaneous administration of NAC and TX-100 provided the highest enhancement (22.5-fold) of intestinal FD-4 absorption compared to the control. Although the detailed mechanism for the observed drastic improvement is unclear, one possible reason was thought to be due to the improved diffusivity of TX-100 micellar system in the mucus layer. All these results suggest that the combination of a mucolytic agent and a non-ionic surfactant may have potential as an enhancing system for peroral delivery of poorly absorbed hydrophilic compounds like protein and peptide drugs.
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Affiliation(s)
- Shinya Takatsuka
- Pharmaceutical Development Laboratories, Tanabe Seiyaku Co., Ltd., Osaka, Japan.
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41
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Iida A, Tomita M, Idota Y, Takizawa Y, Hayashi M. Improvement of Intestinal Absorption of Pglycoprotein Substrate by Dtartaric Acid. Drug Metab Pharmacokinet 2006; 21:424-8. [PMID: 17072096 DOI: 10.2133/dmpk.21.424] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [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: 11/30/2022]
Abstract
The purpose of the present experiment was to examine the effects of D-tartaric acid (TA) on intestinal drug absorption under both in situ and in vitro experimental conditions. In the in vitro diffusion chamber experiments, TA (10 mM) added to the mucosal side of rat colon significantly decreased rhodamine123 (Rho 123) transport from the serosal to mucosal side. Since TA has been shown to change the integrity of the epithelial tight junctions in rat colon at low pH conditions, resulting in improved paracellular drug transport, the effect of TA on membrane resistance was examined at pH 7.4 in the present study. It was found that membrane resistance, an indicator of paracellular integrity, did not change at pH 7.4. In the in situ loop method, TA (20 mM) increased the absorption of Rho123 in both ileum and colon but not in jejunum. TA (20 mM) also increased the absorption of daunorubicin in the ileum, but TA (20 mM) did not change the expression level of P-glycoprotein (P-gp). TA (20 mM) significantly inhibited excretion of i.v.-administered Rho123 and daunorubicin into the ileal lumen. In conclusion, for the first time we demonstrated that TA increases the intestinal absorption of P-gp substrates Rho123 and daunorubicin, possibly by modulating the P-gp function without changing the expression level of P-gp in the rat intestine.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/metabolism
- ATP Binding Cassette Transporter, Subfamily B, Member 1/physiology
- Animals
- Antibiotics, Antineoplastic/administration & dosage
- Antibiotics, Antineoplastic/pharmacokinetics
- Biological Transport/drug effects
- Biological Transport/physiology
- Blotting, Western
- Cardiovascular Agents/administration & dosage
- Cardiovascular Agents/pharmacokinetics
- Colon/cytology
- Colon/drug effects
- Colon/metabolism
- Daunorubicin/administration & dosage
- Daunorubicin/pharmacokinetics
- Diffusion Chambers, Culture/methods
- Fluorescent Dyes/pharmacokinetics
- Ileum/cytology
- Ileum/drug effects
- Ileum/metabolism
- Injections, Intravenous
- Intestinal Absorption/drug effects
- Jejunum/cytology
- Jejunum/drug effects
- Jejunum/metabolism
- Male
- Rats
- Rats, Wistar
- Rhodamine 123/pharmacokinetics
- Tartrates/pharmacology
- Verapamil/administration & dosage
- Verapamil/pharmacokinetics
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Affiliation(s)
- Aiko Iida
- Department of Drug Absorption and Pharmacokinetics, School of Pharmacy, Tokyo University of Pharmacy and Life Science, Hachioji, Tokyo, Japan.
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42
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Das AS, Das D, Mukherjee M, Mukherjee S, Mitra C. Phytoestrogenic effects of black tea extract (Camellia sinensis) in an oophorectomized rat (Rattus norvegicus) model of osteoporosis. Life Sci 2005; 77:3049-57. [PMID: 15996685 DOI: 10.1016/j.lfs.2005.02.035] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2004] [Accepted: 02/11/2005] [Indexed: 01/17/2023]
Abstract
The adverse side effects of currently available anti-osteoporotic agents warrant the search for compounds with less toxic effects. In this study, we assessed the phytoestrogenic potentiality of whole aqueous extract of black tea (BTE) in a bilaterally oophorectomized rat model (2.5%, 1 ml/100 g body weight/day for 28 days). Although the supplementation was given for 28 days but, sign of revival of copulation period (estrous stage) from non-receptive diestrous stage was first noticed after 21 days of BTE supplementation in bilaterally oophorectomized rats. This was accompanied by a significant increase in serum estradiol level. To test whether this increase in serum estradiol level could have an influence upon the oophorectomy-induced damage of bone, we assessed marker parameters of bone resorption and osteoclastic activity (tartrate-resistant acid phosphatase), collagen degradation (urinary hydroxyproline), bone loss (bone ash mineral content) and bone breaking strength (bone density). Results indicated that increase in serum estradiol level after BTE supplementation could significantly diminish oophorectomy-induced decaying changes in bone. This study proposes that aqueous BTE may be assessed as a phytoestrogenic compound for prevention against estrogen deficiency-related osteoporotic damages.
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Affiliation(s)
- Asankur Sekhar Das
- Department of Physiology, Presidency College, 86/1 College Street, Kolkata-700 073, India
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43
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Abstract
The present investigation describes the synthesis and characterization of novel biodegradable nanoparticles based on chitosan for biomedical applications. Natural di- and tricarboxylic acids were used for intramolecular cross-linking of the chitosan linear chains. The condensation reaction of carboxylic groups and pendant amino groups of chitosan was performed by using water-soluble carbodiimide. This method allows the formation of polycations, polyanions, and polyampholyte nanoparticles. The prepared nanosystems were stable in aqueous media at low pH, neutral, and mild alkaline conditions. The structure of products was determined by NMR spectroscopy, and the particle size was identified by laser light scattering (DLS) and transmission electron microscopy (TEM) measurements. It was found that particle size depends on the pH, but at a given pH, it was independent of the ratio of cross-linking and the cross-linking agent. Particle size measured by TEM varied in the range 60-280 nm. In the swollen state, the average size of the particles measured by DLS was in the range 270-370 nm depending on the pH. The biodegradable cross-linked chitosan nanoparticles, as solutions or dispersions in aqueous media, might be useful for various biomedical applications.
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Affiliation(s)
- Magdolna Bodnar
- Department of Colloid and Environmental Chemistry, University of Debrecen, H-4010 Debrecen, Hungary
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44
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Ahboucha S, Araqi F, Layrargues GP, Butterworth RF. Differential effects of ammonia on the benzodiazepine modulatory site on the GABA-A receptor complex of human brain. Neurochem Int 2005; 47:58-63. [PMID: 15913842 DOI: 10.1016/j.neuint.2005.04.007] [Citation(s) in RCA: 12] [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: 10/25/2022]
Abstract
Ammonia is a key factor in the pathogenesis of encephalopathies associated with liver failure. A direct effect of ammonia on GABAergic neurotransmission was proposed as a mechanism that may explain its neurotoxic effect on the basis of electrophysiological and biochemical studies performed in animal models of liver failure. In the present study, we investigated using a radiometric assay the effect of ammonia on the binding of GABA-A receptor ligands to membranes from normal human brains. Ammonium tartrate significantly decreased the maximal binding of [3H]flunitrazepam to well-washed frontal cortical membranes (366+/-63 fmol/mg protein in absence of ammonia versus 294.1+/-51 fmol/mg protein in presence of 2 mM ammonia; p<0.05). The efficacy of the effects of ammonia was within the millimolar range (IC50=4.8 mM). This effect was not seen in cerebellum or hippocampus. Ammonia exposure decreased the maximal binding of [3H]flumazenil (284.9+/-24.2 fmol/mg protein in absence of ammonia versus 146.4+/-15.6 fmol/mg protein in presence of 2 mM ammonia; p<0.01). This effect was seen with a greater potency (Imax=32.4%) and a lower IC50 (0.1 mM). Inhibition of [3H]flumazenil binding was significant in all brain regions. The apparent ammonia-induced decrease of [3H]flunitrazepam and [3H]flumazenil binding was due to a decrease in the binding affinities of these ligands for the benzodiazepine site. In contrast, ammonium tartrate exposure did not cause significant changes to the binding of [3H]muscimol in any brain region. These findings demonstrate that ammonia interacts negatively with components of the benzodiazepine-associated site at the GABA-A receptor complex in human brain in contrast to previous reports in the rat, and thus, does not support the notion that ammonia directly activates the GABA-A receptor complex resulting in increased GABAergic neurotransmission in human hepatic encephalopathy. These findings also suggest that positron emission tomography studies in cirrhotic patients using [11C]flumazenil may be underestimating GABA-A receptor sites depending upon the degree of hyperammonemia of the patient.
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Affiliation(s)
- Samir Ahboucha
- Neuroscience Research Unit, CHUM (Campus Saint-Luc), 1058 St-Denis, Montreal, Que., Canada H2X 3J4
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45
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Hannig C, Hamkens A, Becker K, Attin R, Attin T. Erosive effects of different acids on bovine enamel: release of calcium and phosphate in vitro. Arch Oral Biol 2005; 50:541-52. [PMID: 15848147 DOI: 10.1016/j.archoralbio.2004.11.002] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2004] [Accepted: 11/02/2004] [Indexed: 11/17/2022]
Abstract
The present study intended to investigate minimal erosive effects of different acids on enamel during short time incubation via determination of calcium and phosphate dissolution. Bovine enamel specimens were eroded for 1-5 min with eight different acids of pH 2, 2.3 and 3 (citric (CA), maleic (MA), lactic (LA), tartaric (TA), phosphoric (PA), oxalic (OA), acetic (AA) and hydrochloric acid (HCl)). Calcium (Ca) and phosphate (P) release were determined photometrically using arsenazo III (calcium) and malachite green (phosphate) as substrates. Each subgroup contained eight enamel specimens. Amount of titratable acid was determined for all acidic solutions. MA, LA, TA, AA and HCl caused linear release of Ca and P, PA of Ca, CA of P. For CA, MA, LA, TA, AA, PA and HCl mineral loss was shown to be pH-dependent. Ca dissolution varied between 28.6+/-4.4 (LA, pH 2) and 2.4+/-0.7 nmol mm(-2)min(-1) (HCl, pH 3), P dissolution ranged between 17.2+/-2.6 (LA, pH 2) and 1.4+/-0.4 nmol mm(-2)min(-1) (HCl, pH 3). LA was one of the most erosive acids. AA was very erosive at pH 3. HCl and MA were shown to have the lowest erosive effects. There was only a weak correlation (r=0.28) between P and Ca release and the amount of titratable acid. The method of the present study allows investigation of minimal erosive effects via direct determination of P and Ca dissolution. During short time exposition at constant pH level, erosive effects mainly depend on pH and type of acid but not on amount of titratable acid.
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Affiliation(s)
- Christian Hannig
- Department of Operative Dentistry, Preventive Dentistry and Periodontology, University of Göttingen, Robert-Koch-Str. 40, D-37075 Göttingen, Germany.
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46
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Kneuper H, Janausch IG, Vijayan V, Zweckstetter M, Bock V, Griesinger C, Unden G. The Nature of the Stimulus and of the Fumarate Binding Site of the Fumarate Sensor DcuS of Escherichia coli. J Biol Chem 2005; 280:20596-603. [PMID: 15781452 DOI: 10.1074/jbc.m502015200] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [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: 11/06/2022] Open
Abstract
DcuS is a membrane-associated sensory histidine kinase of Escherichia coli specific for C(4) -dicarboxylates. The nature of the stimulus and its structural prerequisites were determined by measuring the induction of DcuS-dependent dcuB'-'lacZ gene expression. C(4)-dicarboxylates without or with substitutions at C2/C3 by hydrophilic (hydroxy, amino, or thiolate) groups stimulated gene expression in a similar way. When one carboxylate was replaced by sulfonate, methoxy, or nitro groups, only the latter (3-nitropropionate) was active. Thus, the ligand of DcuS has to carry two carboxylate or carboxylate/nitro groups 3.1-3.8 A apart from each other. The effector concentrations for half-maximal induction of dcuB'-'lacZ expression were 2-3 mm for the C(4)-dicarboxylates and 0.5 mm for 3-nitropropionate or d-tartrate. The periplasmic domain of DcuS contains a conserved cluster of positively charged or polar amino acid residues (Arg(107)-X(2)-His(110)-X(9)-Phe(120)-X(26)-Arg(147)-X-Phe(149)) that were essential for fumarate-dependent transcriptional regulation. The presence of fumarate or d-tartrate caused sharpening of peaks or chemical shift changes in HSQC NMR spectra of the isolated C(4)-dicarboylate binding domain. The amino acid residues responding to fumarate or d-tartrate were in the region comprising residues 89-150 and including the supposed binding site. DcuS(R147A) mutant with an inactivated binding site was isolated and reconstituted in liposomes. The protein showed the same (activation-independent) kinase activity as DcuS, but autophosphorylation of DcuS was no longer stimulated by C(4)-dicarboxylates. Therefore, the R147A mutation affected signal perception and transfer to the kinase but not the kinase activity per se.
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Affiliation(s)
- Holger Kneuper
- Institut für Mikrobiologie und Weinforschung, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
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47
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Municio MJ, Traba ML. Effects of 24,25(OH)2D3, 1,25(OH)2D3 and 25(OH)D3 on alkaline and tartrate-resistant acid phosphatase activities in fetal rat calvaria. J Physiol Biochem 2005; 60:219-24. [PMID: 15700769 DOI: 10.1007/bf03167032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The aim of this work was to evaluate the effects of 24,25-dihydroxyvitamin D3, 24,25(OH)2D3, on alkaline phosphatase (AP) and tartrate-resistant acid phosphatase (TRAP) activities in fetal rat calvaria cultures. These actions were compared with those of 1,25-dihydroxyvitamin D3, 1,25(OH)2D3, and 25-hydroxyvitamin D3, 25(OH)D3, in similar experimental conditions. At 10 min, 30 min and at 24 h incubation time, 1,25(OH)2D3 (10(-10)M) and 25(OH)D3 (10(-7) M) produced a significant increase in AP and TRAP activities compared to control group (without vitamin D metabolites). However, 24,25(OH)2D3 (10(-7) M) only produced effects on phosphatase activities similar to those produced by 1,25(OH)2D3 and 25(OH)D3, after 24 h incubation time. These findings suggest that 1,25(OH)2D3 and 25(OH)2D3 could carry out actions in minutes (nongenomic mechanism), while 24,25(OH)2D3 needs longer periods of time to perform its biological actions (genomic mechanism).
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Affiliation(s)
- M J Municio
- Laboratorio de Bioquímica, Sección de Fisiopatología Osea, Fundación Jiménez Díaz, Avda. Reyes Católicos 2, 28040 Madrid, Spain
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48
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Wannet WJ, Wassenaar RW, Jorissen HJ, van der Drift C, Op den Camp HJ. Purification and characterization of an acid phosphatase from the commercial mushroom Agaricus bisporus. Antonie Van Leeuwenhoek 2004; 77:215-22. [PMID: 15188886 DOI: 10.1023/a:1002450221778] [Citation(s) in RCA: 10] [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] [Indexed: 11/12/2022]
Abstract
Acid phosphatase [AP; EC 3.1.3.2], a key enzyme involved in the synthesis of mannitol in Agaricus bisporus, was purified to homogeneity and characterized. The native enzyme appeared to be a high molecular weight type glycoprotein. It has a molecular weight of 145 kDa and consists of four identical 39-kDa subunits. The isoelectric point of the enzyme was found at 4.7. Maximum activity occurred at 65 degrees C. The optimum pH range was between 3.5 and 5.5, with maximum activity at pH 4.75. The enzyme was unaffected by EDTA, and inhibited by tartrate and inorganic phosphate. The enzyme exhibits a Km for p-nitrophenylphosphate and fructose-6-phosphate of 370 microM and 3.1 mM, respectively. A broad substrate specificity was observed with significant activities for fructose-6-phosphate, glucose-6-phosphate, mannitol-1-phosphate, AMP and beta-glycerol phosphate. Only phosphomonoesters were dephosphorylated. Antibodies raised against the purified enzyme could precipitate AP activity from a cell-free extract in an anticatalytic immunoprecipitation test.
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Affiliation(s)
- W J Wannet
- Department of Microbiology, Faculty of Science, University of Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands
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49
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Batarseh KI. Anomaly and correlation of killing in the therapeutic properties of silver (I) chelation with glutamic and tartaric acids. J Antimicrob Chemother 2004; 54:546-8. [PMID: 15243026 DOI: 10.1093/jac/dkh349] [Citation(s) in RCA: 102] [Impact Index Per Article: 5.1] [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: 11/13/2022] Open
Abstract
OBJECTIVES To investigate whether silver chelates or silver ions are more effective as therapeutic agents, and to examine their mode of action so that safer and stable compounds that have a broad spectrum of therapeutic activities can be developed. METHODS Efficacy was investigated against Pseudomonas aeruginosa (ATCC 15442) by determining MIC via a broth macrodilution procedure using NCCLS methods for antibiotic susceptibility testing. RESULTS It was found that the responsible agent for silver therapeutic properties is the silver chelates rather than silver ions, contradicting previous findings, and the efficacy profiles mimic that of free silver ions present in solution. CONCLUSIONS Silver therapeutic activities seem to be more effective as complexes-an intracellular package-rather than free silver ions, demonstrating that the effect of silver is linked to cells' DNA unwinding, and not respiratory or membrane functionality as was traditionally recognized.
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Affiliation(s)
- Kareen I Batarseh
- Alpha-OmegaBiologicals, 8610 Larkview Lane, Fairfax Station, VA 22039, USA.
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50
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Miyazono KI, Kudo N, Tanokura M. Cloning, purification, crystallization and preliminary crystallographic analysis of acylphosphatase from Pyrococcus horikoshii OT3. Acta Crystallogr D Biol Crystallogr 2004; 60:1135-6. [PMID: 15159579 DOI: 10.1107/s0907444904007735] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2004] [Accepted: 03/31/2004] [Indexed: 11/10/2022]
Abstract
Acylphosphatase is one of the smallest enzymes and catalyzes the hydrolysis of the carboxy-phosphate bond. An extremely thermostable acylphosphatase from a hyperthermophilic archaea, Pyrococcus horikoshii OT3, has been cloned, expressed in Escherichia coli, purified and crystallized using the sitting-drop vapour-diffusion method with potassium/sodium tartrate as the precipitant at pH 5.5. X-ray diffraction data have been collected to a highest resolution of 1.72 angstroms on a synchrotron-radiation source. The crystals belong to space group P3(2)21, with approximate unit-cell parameters a = b = 86.6, c = 75.4 angstroms and two monomers in the asymmetric unit.
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Affiliation(s)
- Ken Ichi Miyazono
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
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