1
|
Julio-Gonzalez LC, Moreno FJ, Jimeno ML, Doyagüez EG, Olano A, Corzo N, Hernandez-Hernandez O. Hydrolysis and transglycosylation activities of glycosidases from small intestine brush-border membrane vesicles. Food Res Int 2020; 139:109940. [PMID: 33509494 DOI: 10.1016/j.foodres.2020.109940] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 11/25/2020] [Accepted: 11/27/2020] [Indexed: 12/24/2022]
Abstract
In order to know the catalytic activities of the disaccharidases expressed in the mammalian small intestinal brush-border membrane vesicles (BBMV) high concentrated solutions of sucrose, maltose, isomaltulose, trehalose and the mixture sucrose:lactose were incubated with pig small intestine disaccharidases. The hydrolysis and transglycosylation reactions generated new di- and trisaccharides, characterized and quantified by GC-MS and NMR, except for trehalose where only hydrolysis was detected. In general, α-glucosyl-glucoses and α-glucosyl-fructoses were the most abundant structures, whereas no fructosyl-fructoses or fructosyl-glucoses were found. The in-depth structural characterization of the obtained carbohydrates represents a new alternative to understand the potential catalytic activities of pig small intestinal disaccharidases. The hypothesis that the oligosaccharides synthesized by glycoside hydrolases could be also hydrolysed by the same enzymes was confirmed. This information could be extremely useful in the design of new non-digestible or partially digestible oligosaccharides with potential prebiotic properties.
Collapse
Affiliation(s)
| | - F Javier Moreno
- Institute of Food Science Research, CIAL (CSIC-UAM), CEI (UAM+CSIC), Nicolás Cabrera 9, 28049 Madrid, Spain
| | - María Luisa Jimeno
- Centro de Química Orgánica "Lora Tamayo" (CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
| | - Elisa G Doyagüez
- Centro de Química Orgánica "Lora Tamayo" (CSIC), Juan de la Cierva 3, 28006, Madrid, Spain
| | - Agustín Olano
- Institute of Food Science Research, CIAL (CSIC-UAM), CEI (UAM+CSIC), Nicolás Cabrera 9, 28049 Madrid, Spain
| | - Nieves Corzo
- Institute of Food Science Research, CIAL (CSIC-UAM), CEI (UAM+CSIC), Nicolás Cabrera 9, 28049 Madrid, Spain.
| | | |
Collapse
|
2
|
Wang F, Li J, Fan S, Jin Z, Huang C. Targeting stress granules: A novel therapeutic strategy for human diseases. Pharmacol Res 2020; 161:105143. [PMID: 32814168 PMCID: PMC7428673 DOI: 10.1016/j.phrs.2020.105143] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 08/07/2020] [Accepted: 08/10/2020] [Indexed: 12/16/2022]
Abstract
Stress granules (SGs) are assemblies of mRNA and proteins that form from mRNAs stalled in translation initiation in response to stress. Chronic stress might even induce formation of cytotoxic pathological SGs. SGs participate in various biological functions including response to apoptosis, inflammation, immune modulation, and signalling pathways; moreover, SGs are involved in pathogenesis of neurodegenerative diseases, viral infection, aging, cancers and many other diseases. Emerging evidence has shown that small molecules can affect SG dynamics, including assembly, disassembly, maintenance and clearance. Thus, targeting SGs is a potential therapeutic strategy for the treatment of human diseases and the promotion of health. The established methods for detecting SGs provided ready tools for large-scale screening of agents that alter the dynamics of SGs. Here, we describe the effects of small molecules on SG assembly, disassembly, and their roles in the disease. Moreover, we provide perspective for the possible application of small molecules targeting SGs in the treatment of human diseases.
Collapse
Affiliation(s)
- Fei Wang
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai, 201203, China
| | - Juan Li
- College of Chemistry and Life Sciences, Zhejiang Normal University, 688 Yingbin Road, Jinhua, Zhejiang, 321004, China
| | - Shengjie Fan
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai, 201203, China
| | - Zhigang Jin
- College of Chemistry and Life Sciences, Zhejiang Normal University, 688 Yingbin Road, Jinhua, Zhejiang, 321004, China.
| | - Cheng Huang
- School of Pharmacy, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai, 201203, China.
| |
Collapse
|
3
|
Daughtry KV, Johanningsmeier SD, Sanozky-Dawes R, Klaenhammer TR, Barrangou R. Phenotypic and genotypic diversity of Lactobacillus buchneri strains isolated from spoiled, fermented cucumber. Int J Food Microbiol 2018; 280:46-56. [PMID: 29778800 DOI: 10.1016/j.ijfoodmicro.2018.04.044] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 03/06/2018] [Accepted: 04/28/2018] [Indexed: 02/02/2023]
Abstract
Lactobacillus buchneri is a Gram-positive, obligate heterofermentative, facultative anaerobe commonly affiliated with spoilage of food products. Notably, L. buchneri is able to metabolize lactic acid into acetic acid and 1,2-propanediol. Although beneficial to the silage industry, this metabolic capability is detrimental to preservation of cucumbers by fermentation. The objective of this study was to characterize isolates of L. buchneri purified from both industrial and experimental fermented cucumber after the onset of secondary fermentation. Genotypic and phenotypic characterization included 16S rRNA sequencing, DiversiLab® rep-PCR, colony morphology, API 50 CH carbohydrate analysis, and ability to degrade lactic acid in modified MRS and fermented cucumber media. Distinct groups of isolates were identified with differing colony morphologies that varied in color (translucent white to opaque yellow), diameter (1 mm-11 mm), and shape (umbonate, flat, circular or irregular). Growth rates in MRS revealed strain differences, and a wide spectrum of carbon source utilization was observed. Some strains were able to ferment as many as 21 of 49 tested carbon sources, including inulin, fucose, gentiobiose, lactose, mannitol, potassium ketogluconate, saccharose, raffinose, galactose, and xylose, while others metabolized as few as eight carbohydrates as the sole source of carbon. All isolates degraded lactic acid in both fermented cucumber medium and modified MRS, but exhibited differences in the rate and extent of lactate degradation. Isolates clustered into eight distinct groups based on rep-PCR fingerprints with 20 of 36 of the isolates exhibiting >97% similarity. Although isolated from similar environmental niches, significant phenotypic and genotypic diversity was found among the L. buchneri cultures. A collection of unique L. buchneri strains was identified and characterized, providing the basis for further analysis of metabolic and genomic capabilities of this species to enable control of lactic acid degradation in fermented plant materials.
Collapse
|
4
|
Zhang L, Xiao Q, Wang Y, Zhang C, He W, Yin L. Denatured protein-coated docetaxel nanoparticles: Alterable drug state and cytosolic delivery. Int J Pharm 2017; 523:1-14. [PMID: 28323094 DOI: 10.1016/j.ijpharm.2017.03.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 02/28/2017] [Accepted: 03/13/2017] [Indexed: 11/25/2022]
Abstract
Many lead compounds have a low solubility in water, which substantially hinders their clinical application. Nanosuspensions have been considered a promising strategy for the delivery of water-insoluble drugs. Here, denatured soy protein isolate (SPI)-coated docetaxel nanosuspensions (DTX-NS) were developed using an anti-solvent precipitation-ultrasonication method to improve the water-solubility of DTX, thus improving its intracellular delivery. DTX-NS, with a diameter of 150-250nm and drug-loading up to 18.18%, were successfully prepared by coating drug particles with SPI. Interestingly, the drug state of DTX-NS was alterable. Amorphous drug nanoparticles were obtained at low drug-loading, whereas at a high drug-loading, the DTX-NS drug was mainly present in the crystalline state. Moreover, DTX-NS could be internalized at high levels by cancer cells and enter the cytosol by lysosomal escape, enhancing cell cytotoxicity and apoptosis compared with free DTX. Taken together, denatured SPI has a strong stabilization effect on nanosuspensions, and the drug state in SPI-coated nanosuspensions is alterable by changing the drug-loading. Moreover, DTX-NS could achieve cytosolic delivery, generating enhanced cell cytotoxicity against cancer cells.
Collapse
Affiliation(s)
- Li Zhang
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Qingqing Xiao
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Yiran Wang
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Chenshuang Zhang
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Wei He
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China.
| | - Lifang Yin
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China.
| |
Collapse
|
5
|
Zhang L, Zhong J, Liu H, Xin K, Chen C, Li Q, Wei Y, Wang Y, Chen F, Shen X. Complete genome sequence of the drought resistance-promoting endophyte Klebsiella sp. LTGPAF-6F. J Biotechnol 2017; 246:36-39. [PMID: 28223006 DOI: 10.1016/j.jbiotec.2017.02.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 02/10/2017] [Accepted: 02/10/2017] [Indexed: 10/20/2022]
Abstract
Bacterial endophytes with capacity to promote plant growth and improve plant tolerance against biotic and abiotic stresses have importance in agricultural practice and phytoremediation. A plant growth-promoting endophyte named Klebsiella sp. LTGPAF-6F, which was isolated from the roots of the desert plant Alhagi sparsifolia in north-west China, exhibits the ability to enhance the growth of wheat under drought stress. The complete genome sequence of this strain consists of one circular chromosome and two circular plasmids. From the genome, we identified genes related to the plant growth promotion and stress tolerance, such as nitrogen fixation, production of indole-3-acetic acid, acetoin, 2,3-butanediol, spermidine and trehalose. This genome sequence provides a basis for understanding the beneficial interactions between LTGPAF-6F and host plants, and will facilitate its applications as biotechnological agents in agriculture.
Collapse
Affiliation(s)
- Lei Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Jun Zhong
- CAS Key Laboratory of Genome Sciences & Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing 100101, PR China
| | - Hao Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Kaiyun Xin
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Chaoqiong Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Qiqi Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Yahong Wei
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Yao Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, PR China
| | - Fei Chen
- CAS Key Laboratory of Genome Sciences & Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing 100101, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Collaborative Innovation Center for Genetics and Development, PR China.
| | - Xihui Shen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
| |
Collapse
|
6
|
Xin R, Qi S, Zeng C, Khan FI, Yang B, Wang Y. A functional natural deep eutectic solvent based on trehalose: Structural and physicochemical properties. Food Chem 2017; 217:560-7. [PMID: 27664672 DOI: 10.1016/j.foodchem.2016.09.012] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 08/16/2016] [Accepted: 09/03/2016] [Indexed: 11/21/2022]
Abstract
In this study, the natural deep eutectic solvents (NADESs) based on trehalose and choline chloride have been prepared to enhance the protein thermostability. The results of fourier transform infrared spectroscopy and (1)H nuclear magnetic resonance spectroscopy suggested that there were intensive hydrogen-bonding interactions between trehalose and choline chloride in TCCL3-DES and TCCL3-DES75. The physicochemical properties of TCCL3-DES and TCCL3-DES75 were investigated in the temperature range of 293.15-363.15K. Our results revealed that the thermostability of lysozyme, a model protein used in this study was dramatically increased in TCCL3-DES75, as evidenced by the disappearance of the denaturing peak from their Differential Scanning Calorimetry (DSC) traces. The results of circular dichroism (CD) experiments further demonstrated that the lysozyme in TCCL3-DES75 unfolded partially at 90°C and recovered to the initial structure at 20°C. The study suggests that TCCL3-DES75 might be a potential solvent for stabilizing proteins.
Collapse
|
7
|
Gandhi M, Pandya T, Gandhi R, Patel S, Mashru R, Misra A, Tandel H. Inhalable liposomal dry powder of gemcitabine-HCl: Formulation, in vitro characterization and in vivo studies. Int J Pharm 2015; 496:886-95. [PMID: 26453787 DOI: 10.1016/j.ijpharm.2015.10.020] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 10/04/2015] [Indexed: 11/21/2022]
Abstract
Pulmonary drug delivery system facilitates local instillation of anticancer drugs to lungs which has proven to be pioneering approach for treatment of lung cancer. This approach led the groundwork for delivering liposomal formulation directly to lungs. Gemcitabine-HCl is currently considered as most effective drug for management of lung cancer. However, its application is limited owing to its metabolism by enzymes present in plasma resulting in reduced efficacy and higher toxicity. In present study, lyophilisation technique was used to convert liposomes into dry powder inhaler, which was formulated using emulsification solvent evaporation technique. The physicochemical properties including size, morphology, entrapment efficiency, loading efficiency etc. of formulated liposomes were evaluated. The prepared liposomal DPI (LDPI) formulations were then examined for solid state characteristics and aerosol performance using cascade impactor. From all the formulations prepared, the LDPI formulated using trehalose as cryoprotectant presented required properties along with desirable deposition pattern. Finally, the optimized formulation was selected for in vitro cell line studies; in vivo studies and stability study. This formulated inhalable particles offers a promising approach for the management of lung cancer through regional chemotherapy.
Collapse
|
8
|
He W, Yang K, Fan L, Lv Y, Jin Z, Zhu S, Qin C, Wang Y, Yin L. Denatured globular protein and bile salt-coated nanoparticles for poorly water-soluble drugs: Penetration across the intestinal epithelial barrier into the circulation system and enhanced oral bioavailability. Int J Pharm 2015; 495:9-18. [PMID: 26325310 DOI: 10.1016/j.ijpharm.2015.08.086] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 08/19/2015] [Accepted: 08/26/2015] [Indexed: 12/28/2022]
Abstract
Oral drug delivery is the most preferred route for patients; however, the low solubility of drugs and the resultant poor absorption compromise the benefits of oral administration. On the other hand, for years, the overwhelmingly accepted mechanism for enhanced oral absorption using lipid nanocarriers was based on the process of lipid digestion and drug solubilization in the small intestine. Few reports indicated that other bypass pathways are involved in drug absorption in the gastrointestinal tract (GIT) for oral delivery of nanocarriers. Herein, we report a new nanoemulsion system with a denatured globular protein with a diameter of 30 nm, soybean protein isolates (SPI), and bile salt as emulsifiers, aiming to enhance the absorption of insoluble drugs and explore other pathways for absorption. A BCS class II drug, fenofibrate (FB), was used as the model drug. The SPI and bile salt-coated Ns with a diameter of approximately 150 nm were prepared via a high-pressure homogenizing procedure. Interestingly, the present Ns could be converted to solid dosage form using fluid-bed coating technology, maintaining a nanoscale size. Most importantly, in a model of in situ rat intestinal perfusion, Ns could penetrate across the intestinal epithelial barrier into the systemic circulation and then obtain biodistribution into other tissues. In addition, Ns significantly improved FB oral absorption, exhibited as a greater than 2- and 2.5-fold increase in Cmax and AUC0-t, respectively, compared to the suspension formulation. Overall, the present Ns are promising nanocarriers for the oral delivery of insoluble drugs, and the penetration of intact Ns across the GIT barrier into systemic circulation may be a new strategy for improved drug absorption with the use of nanocarriers.
Collapse
Affiliation(s)
- Wei He
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Ke Yang
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Lifang Fan
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China; Jiangsu Aosaikang Pharmaceutical Co., Ltd., Nanjing 210009, PR China
| | - Yaqi Lv
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Zhu Jin
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Shumin Zhu
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Chao Qin
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Yiao Wang
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Lifang Yin
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China.
| |
Collapse
|
9
|
Aguilar MI, Benítez WV, Colín A, Bye R, Ríos-Gómez R, Calzada F. Evaluation of the diuretic activity in two Mexican medicinal species: Selaginella nothohybrida and Selaginella lepidophylla and its effects with ciclooxigenases inhibitors. J Ethnopharmacol 2015; 163:167-172. [PMID: 25645190 DOI: 10.1016/j.jep.2015.01.031] [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: 11/06/2014] [Revised: 01/18/2015] [Accepted: 01/21/2015] [Indexed: 06/04/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Doradilla is a plant that has a long history in the Mexican traditional system of medicine for gall and renal stones, diuresis, stomach and liver inflammation among other diseases. Major components isolated from these plants include biflavonoids as amentoflavone (1), robustaflavone (2) and (S)-2,3-dihydrorobustaflavone (3) and the carbohydrate trehalose (4). The aim of this study was to evaluate the diuretic effect of the decoction of Selaginella nothohybrida Valdespino and Selaginella lepidophylla (Hook & Grev) Spring (Selaginellaceae), and compounds 1-4. We also explored the probable mode of action comparing the effects when using nonspecific and specific COX׳s inhibitors. MATERIALS AND METHODS Three biflavonoids (1-3) were isolated from the ethyl acetate extraction of the aqueous decoction and the carbohydrate trehalose (4) from the aqueous phase. The structures of all compounds were elucidated by spectroscopic methods and comparisons were made against published data. The diuretic activity was assessed in mice by oral administration of the decoctions in doses of 1000 and 2000mg/kg and biflavonoids 1-3 and trehalose (4) in a dose range of 10mg/kg using furosemide as a standard drug. Inhibitors of COX׳s such as acetyl salicylic acid, sodium naproxen, indomethacin and Celebrex were also assayed to analyze the involvement of renal prostaglandins in diuresis. Water excretion rate, pH, density, conductivity, and contents of Na(+) and K(+) were measured in the urine of mice. RESULTS Decoction of Selaginella lepidophylla showed lower effect in the urine output at doses of 1000 and 2000mg/kg, while decoction of Selaginella nothohybrida produced an increase at 2000mg/kg (P<0.05). Urinary electrolytes excretion was also affected by this last extract and pure compounds: decoction diminished urinary excretion of sodium and potassium ions, so as compounds 1 and 4; compounds 2 and 3 observed just a natriuretic effect. Pretreated mice with COX׳s inhibitors and then with test compounds 1, 2, 4 and decoction showed inhibition of diuresis in all cases exception for treatment with trehalose (4); natriuretic effect was observed in all cases except for biflavonoid robustaflavone (2) which behaved as the reference compound furosemide. Selaginella nothohybrida decoction behaved similarly to COX-2 inhibitor Celebrex (8), inhibiting diuresis. CONCLUSIONS Selaginella nothohybrida presents a moderate diuretic effect, which appears to be in partly mediated by the presence of biflavonoids and trehalose. Renal prostaglandins may be involved in the mechanism of diuresis. The present results provide a quantitative basis explaining the traditional folk medicine use of Selaginella nothohybrida as a diuretic agent by Mexican population.
Collapse
Affiliation(s)
- María I Aguilar
- Facultad de Química, Universidad Nacional Autónoma de México, Mexico.
| | - Wendy V Benítez
- Facultad de Química, Universidad Nacional Autónoma de México, Mexico
| | - Arturo Colín
- Facultad de Química, Universidad Nacional Autónoma de México, Mexico
| | - Robert Bye
- Jardín Botánico, Instituto de Biología, Universidad Nacional Autónoma de México, Mexico
| | - Ramiro Ríos-Gómez
- Unidad de Investigación en Sistemática Vegetal y Suelo, FES Zaragoza. Universidad Nacional Autónoma de México, México D.F. 04510, Mexico
| | - Fernando Calzada
- Unidad de Investigación Médica en Farmacología UMAE, Hospital de Especialidades-CORCE, 2° piso, Centro Médico Nacional Siglo XXI, IMSS, Av. Cuauhtémoc 330, Col. Doctores, México, D.F. 06725, Mexico
| |
Collapse
|
10
|
He W, Lv Y, Zhao Y, Xu C, Jin Z, Qin C, Yin L. Core-shell structured gel-nanocarriers for sustained drug release and enhanced antitumor effect. Int J Pharm 2015; 484:163-71. [PMID: 25724136 DOI: 10.1016/j.ijpharm.2015.02.053] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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: 12/20/2014] [Revised: 02/13/2015] [Accepted: 02/23/2015] [Indexed: 12/18/2022]
Abstract
The present paper attempted to develop temperature-sensitive and core-shell structured gel-nanocarriers (gel-NCs) for paclitaxel (PTX) with 12-hydroxystearic acid (12-HSA) as an organic gelator, which aims at sustaining drug release over time and thus improves the therapeutic effect. The gel-NCs were prepared by a mechanical mixing and high-pressure homogenization method. The gelation transition temperature (Tgel) of the organic phase contained in the cores of the gel-NCs was optimized by a stirring method. The gel-NCs were characterized in terms of the particle size, morphology and in vitro drug release. The in vivo studies, including the antitumor effects on H22 tumor-bearing mice, biocompatibility and toxicity in mice, were performed. Gel-NCs with approximately 170 nm were prepared successfully, and the gelation of the liquid cores at 37°C was achieved, while the amount of gelator was 3.75% (w/w). Due to the gelation of the cores, sustained drug release over time was obtained. Moreover, the PTX-loaded gel-NCs suppressed tumor growth more efficiently than the conventional nanocarriers with better in vivo biocompatibility and no toxicity to other healthy organs. In conclusion, the 12-HSA organogel-based NCs appear to be promising systems for the sustained release of active compounds for a long time and thus improve the therapeutic outcome.
Collapse
Affiliation(s)
- Wei He
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Yaqi Lv
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Yaping Zhao
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Chaoran Xu
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Zhu Jin
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Chao Qin
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China
| | - Lifang Yin
- Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, PR China.
| |
Collapse
|
11
|
Munjal B, Bansal AK. Counter-intuitive effect of non-crystallizing sugars on the crystallization of gemcitabine HCl in frozen solutions. Int J Pharm 2015; 478:46-52. [PMID: 25445978 DOI: 10.1016/j.ijpharm.2014.11.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 11/01/2014] [Accepted: 11/02/2014] [Indexed: 11/22/2022]
Abstract
In this study, the effect of four non-crystallizing sugars, namely fructose, trehalose, sucrose and raffinose, was assessed on the crystallization of gemcitabine hydrochloride (GHCl) in frozen solutions. Aqueous solutions containing GHCl (50 mg/mL) and a sugar at varying concentrations (10-60 mg/mL) were frozen in situ in DSC and analyzed in the subsequent heating run. Crystallization propensity of GHCl was quantified in terms of reduced crystallization temperature (RCT) as a function of sugar type and concentration. Multivariate analysis option in JMP(®) software was employed for calculating correlation between the variables. All sugars inhibited GHCl crystallization in a concentration dependent manner. At equal concentration, fructose (with the lowest Tg') exerted the strongest inhibitory effect, whereas raffinose (with the highest Tg') exerted the weakest inhibitory effect. Additionally, RCT showed a poor correlation with Tg' (r=0.2327). Thus, the inhibitory effect of sugars could not be described by their anti-plasticization effect. This counter-intuitive behavior was explained by the inhibitory effect of sugars on ice crystallization, which increased the unfrozen water content (UWC) in the freeze concentrate, thereby lowering the supersaturation of GHCl. This was established by observing a good correlation (r=0.9666) between RCT and ln(1/UWC). Additionally, reduced diffusion kinetics of GHCl in presence of sugar molecules was also postulated. This study highlights the importance of unfrozen water towards governing the crystallization behavior of solutes in multi-component frozen systems.
Collapse
|