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Campos LA, Neto AF, Noronha MC, Santos JV, Cavalcante MK, Castro MC, Pereira VR, Cavalcanti IM, Santos-Magalhães NS. Zein nanoparticles containing ceftazidime and tobramycin: antibacterial activity against Gram-negative bacteria. Future Microbiol 2024; 19:317-334. [PMID: 38440893 DOI: 10.2217/fmb-2023-0147] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2024] Open
Abstract
Aims: This work describes the encapsulation of ceftazidime and tobramycin in zein nanoparticles (ZNPs) and the characterization of their antibacterial and antibiofilm activities against Gram-negative bacteria. Materials & methods: ZNPs were synthesized by nanoprecipitation. Cytotoxicity was assessed by MTT assay and antibacterial and antibiofilm assays were performed by broth microdilution and violet crystal techniques. Results: ZNPs containing ceftazidime (CAZ-ZNPs) and tobramycin (TOB-ZNPs) showed drug encapsulation and thermal stability. Encapsulation of the drugs reduced their cytotoxicity 9-25-fold. Antibacterial activity, inhibition and eradication of biofilm by CAZ-ZNPs and TOB-ZNPs were observed. There was potentiation when CAZ-ZNPs and TOB-ZNPs were combined. Conclusion: CAZ-ZNPs and TOB-ZNPs present ideal physical characteristics for in vivo studies of antibacterial and antibiofilm activities.
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Affiliation(s)
- Luís Aa Campos
- Biochemistry Sector, Keizo Asami Institute, Federal University of Pernambuco, Recife, CEP 50670-901, Pernambuco, Brazil
- Clinical Microbiology Sector, Keizo Asami Institute, Federal University of Pernambuco, Recife, CEP 50670-901, Pernambuco, Brazil
| | - Azael Fs Neto
- Biochemistry Sector, Keizo Asami Institute, Federal University of Pernambuco, Recife, CEP 50670-901, Pernambuco, Brazil
| | - Maria Cs Noronha
- Biochemistry Sector, Keizo Asami Institute, Federal University of Pernambuco, Recife, CEP 50670-901, Pernambuco, Brazil
| | - João Vo Santos
- Clinical Microbiology Sector, Keizo Asami Institute, Federal University of Pernambuco, Recife, CEP 50670-901, Pernambuco, Brazil
| | - Marton Ka Cavalcante
- Oswaldo Cruz Pernambuco Foundation, Fiocruz/PE, Immunogenetics Laboratory, Recife, CEP 50740-465, Pernambuco, Brazil
| | - Maria Cab Castro
- Oswaldo Cruz Pernambuco Foundation, Fiocruz/PE, Immunogenetics Laboratory, Recife, CEP 50740-465, Pernambuco, Brazil
- Parasitology Laboratory, Federal University of Pernambuco/Academic Center of Vitória, Vitória de Santo Antão, CEP 55608- 680, Pernambuco, Brazil
| | - Valéria Ra Pereira
- Oswaldo Cruz Pernambuco Foundation, Fiocruz/PE, Immunogenetics Laboratory, Recife, CEP 50740-465, Pernambuco, Brazil
| | - Isabella Mf Cavalcanti
- Clinical Microbiology Sector, Keizo Asami Institute, Federal University of Pernambuco, Recife, CEP 50670-901, Pernambuco, Brazil
- Laboratory of Microbiology & Immunology, Federal University of Pernambuco/Academic Center of Vitória, Vitória de Santo Antão, CEP 55608- 680, Pernambuco, Brazil
| | - Nereide S Santos-Magalhães
- Biochemistry Sector, Keizo Asami Institute, Federal University of Pernambuco, Recife, CEP 50670-901, Pernambuco, Brazil
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Xavier-Junior FH, Rabello MM, Hernandes MZ, Dias MES, Andrada OHMS, Bezerra BP, Ayala AP, Santos-Magalhães NS. Supramolecular interactions between β-lapachone with cyclodextrins studied using isothermal titration calorimetry and molecular modeling. J Mol Recognit 2017; 30. [PMID: 28675505 DOI: 10.1002/jmr.2646] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 02/02/2017] [Revised: 04/05/2017] [Accepted: 05/17/2017] [Indexed: 11/06/2022]
Abstract
Supramolecular interactions between β-lapachone (β-lap) and cyclodextrins (CDs) were investigated by isothermal titration calorimetry. The most favorable host: guest interaction was characterized using X-ray powder diffraction (XRD), differential scanning calorimetry and thermogravimetry (DSC/TG), spectroscopy (FT-IR), spectroscopy (2D ROESY) nuclear magnetic resonance (NMR), and molecular modeling. Phase solubility diagrams showed β-, HP-β-, SBE-β-, γ-, and HP-γ-CDs at 1.5% (w/w) allowed an increase in apparent solubility of β-lap with enhancement factors of 12.0, 10.1, 11.8, 2.4, and 2.2, respectively. β-lap has a weak interaction with γ- and HP-γ-CDs and tends to interact more favorably with β-CD and its derivatives, especially SBE-β-CD (K = 4160 M-1 ; ΔG = -20.66 kJ·mol-1 ). Thermodynamic analysis suggests a hydrophobic interaction associated with the displacement of water from the cavity of the CD by the β-lap. In addition, van der Waals forces and hydrogen bonds were responsible for the formation of complexes. Taken together, the results showed intermolecular interactions between β-lap and SBE-β-CD, thereby confirming the formation of the inclusion complex. Molecular docking results showed 2 main orientations in which the interaction of benzene moiety at the wider rim of the SBE-β-CD is the most stable (average docking energy of -7.0 kcal/mol). In conclusion, β-lap:SBE-β-CD is proposed as an approach for use in drug delivery systems in cancer research.
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Affiliation(s)
- Francisco H Xavier-Junior
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco (UFPE), Recife, PE, Brazil
| | - Marcelo M Rabello
- Departamento de Ciências Farmacêuticas, Laboratório de Química Teórica Medicinal, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Marcelo Z Hernandes
- Departamento de Ciências Farmacêuticas, Laboratório de Química Teórica Medicinal, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Marília E S Dias
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco (UFPE), Recife, PE, Brazil
| | - Otoni H M S Andrada
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco (UFPE), Recife, PE, Brazil
| | - Beatriz P Bezerra
- Departamento de Física, Universidade Federal do Ceará, Fortaleza, CE, Brazil
| | - Alejandro P Ayala
- Departamento de Física, Universidade Federal do Ceará, Fortaleza, CE, Brazil
| | - Nereide S Santos-Magalhães
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco (UFPE), Recife, PE, Brazil
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Morais WA, de Barros Neto B, Cavalcanti IMF, Xavier Junior FH, Santos-Magalhães NS, Maciel MAM. Coencapsulation of trans-Dehydrocrotonin and trans-Dehydrocrotonin:hydroxypropyl-β-cyclodextrin into Microparticles. J BRAZIL CHEM SOC 2017. [DOI: 10.21577/0103-5053.20160331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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da Cunha CRA, da Silva LCN, Almeida FJF, Ferraz MS, Varejão N, Cartaxo MFDS, de Miranda RDCM, de Aguiar FCA, Santos NPDS, Coelho LCBB, Santos-Magalhães NS, Correia MTDS. Encapsulation into Stealth Liposomes Enhances the Antitumor Action of Recombinant Cratylia mollis Lectin Expressed in Escherichia coli. Front Microbiol 2016; 7:1355. [PMID: 27695439 PMCID: PMC5026010 DOI: 10.3389/fmicb.2016.01355] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 08/16/2016] [Indexed: 11/13/2022] Open
Abstract
This study evaluated the in vivo antitumor potential of the recombinant lectin from seeds of Cratylia mollis (rCramoll) expressed in Escherichia coli, free or encapsulated in stealth liposomes, using mice transplanted with sarcoma 180. rCramoll-loaded stealth liposomes (rCramoll-lipo) were formulated by hydration of the lipid film followed by cycles of freezing and thawing, and about 60% of rCramoll was encapsulated. This novel preparation showed particle size, polydispersity index, and pH suitable for the evaluation of antitumor activity in vivo. Tumor growth inhibition rates were 59% for rCramoll and 75% for rCramoll-lipo. Histopathological analysis of the experimental groups showed that both free and encapsulated lectin caused no changes in the kidneys of animals. Hematological analysis revealed that treatment with rCramoll-lipo significantly increased leukocyte concentration when compared with the untreated and rCramoll group. In conclusion, the encapsulation of rCramoll in stealth liposomes improves its antitumor activity without substantial toxicity; this approach was more successful than the previous results reported for pCramoll loaded into conventional liposomes. At this point, a crucial difference between the antitumor action of free and encapsulated rCramoll was found along with their effects on immune cells. Further investigations are required to elucidate the mechanism(s) of the antitumor effect induced by rCramoll.
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Affiliation(s)
- Cássia R. A. da Cunha
- Laboratório de Bioquímica de Proteínas, Departamento de Bioquímica, Universidade Federal de PernambucoRecife, Brazil
| | - Luís C. N. da Silva
- Laboratório de Bioquímica de Proteínas, Departamento de Bioquímica, Universidade Federal de PernambucoRecife, Brazil
- Programa de Pós-Graduação em Biologia Parasitária, Universidade CeumaSão Luís, Brazil
| | - Fábio J. F. Almeida
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de PernambucoRecife, Brazil
| | - Milena S. Ferraz
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de PernambucoRecife, Brazil
| | - Nathalia Varejão
- Laboratório de Agregação de Proteínas e Amiloidoses, Instituto de Bioquímica Médica, Universidade Federal do Rio de JaneiroRio de Janeiro, Brazil
| | | | | | | | | | - Luana C. B. B. Coelho
- Laboratório de Bioquímica de Proteínas, Departamento de Bioquímica, Universidade Federal de PernambucoRecife, Brazil
| | | | - Maria T. dos Santos Correia
- Laboratório de Bioquímica de Proteínas, Departamento de Bioquímica, Universidade Federal de PernambucoRecife, Brazil
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Ferraz-Carvalho RS, Pereira MA, Linhares LA, Lira-Nogueira MC, Cavalcanti IM, Santos-Magalhães NS, Montenegro LM. Effects of the encapsulation of usnic acid into liposomes and interactions with antituberculous agents against multidrug-resistant tuberculosis clinical isolates. Mem Inst Oswaldo Cruz 2016; 111:330-4. [PMID: 27143488 PMCID: PMC4878302 DOI: 10.1590/0074-02760150454] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 03/20/2016] [Indexed: 11/22/2022] Open
Abstract
Mycobacterium tuberculosis (Mtb) has acquired resistance and
consequently the antibiotic therapeutic options available against this microorganism
are limited. In this scenario, the use of usnic acid (UA), a natural compound,
encapsulated into liposomes is proposed as a new approach in multidrug-resistant
tuberculosis (MDR-TB) therapy. Thus the aim of this study was to evaluate the effect
of the encapsulation of UA into liposomes, as well as its combination with
antituberculous agents such as rifampicin (RIF) and isoniazid (INH) against MDR-TB
clinical isolates. The in vitro antimycobacterial activity of UA-loaded liposomes
(UA-Lipo) against MDR-TB was assessed by the microdilution method. The in vitro
interaction of UA with antituberculous agents was carried out using checkerboard
method. Minimal inhibitory concentration values were 31.25 and 0.98 µg/mL for UA and
UA-Lipo, respectively. The results exhibited a synergistic interaction between RIF
and UA [fractional inhibitory concentration index (FICI) = 0.31] or UA-Lipo (FICI =
0.28). Regarding INH, the combination of UA or UA-Lipo revealed no marked effect
(FICI = 1.30-2.50). The UA-Lipo may be used as a dosage form to improve the
antimycobacterial activity of RIF, a first-line drug for the treatment of infections
caused by Mtb.
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Affiliation(s)
| | - Marcela A Pereira
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco, Recife, PE, Brasil
| | - Leonardo A Linhares
- Departamento de Imunologia, Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, PE, Brasil
| | - Mariane Cb Lira-Nogueira
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco, Recife, PE, Brasil
| | - Isabella Mf Cavalcanti
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco, Recife, PE, Brasil
| | | | - Lílian Ml Montenegro
- Departamento de Imunologia, Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz, Recife, PE, Brasil
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Batista DPC, Souza RDS, Santos-Magalhães NS, de Sena-Filho JG, Teodoro AV, Grillo LAM, Dornelas CB. Polymer/Layered Silicate Nanocomposite as Matrix for Bioinsecticide Formulation. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/masy.201300208] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Diogo P. C. Batista
- Curso de Farmácia (Esenfar); Universidade Federal de Alagoas (UFAL); Campus A. C. Simões Maceió, AL Brazil
| | - Rafael da S. Souza
- Curso de Farmácia (Esenfar); Universidade Federal de Alagoas (UFAL); Campus A. C. Simões Maceió, AL Brazil
| | - Nereide S. Santos-Magalhães
- Laboratório de Imunopatologia Keizo Asami (LIKA); Universidade Federal de Pernambuco (UFPE); Recife PE Brazil
| | - José G. de Sena-Filho
- Empresa Brasileira de Pesquisa Agropecuária (Embrapa Tabuleiros Costeiros); Aracaju; SE Brazil
| | - Adenir V. Teodoro
- Empresa Brasileira de Pesquisa Agropecuária (Embrapa Tabuleiros Costeiros); Aracaju; SE Brazil
| | - Luciano A. M. Grillo
- Curso de Farmácia (Esenfar); Universidade Federal de Alagoas (UFAL); Campus A. C. Simões Maceió, AL Brazil
| | - Camila B. Dornelas
- Curso de Farmácia (Esenfar); Universidade Federal de Alagoas (UFAL); Campus A. C. Simões Maceió, AL Brazil
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Mendonça EAM, Lira MCB, Rabello MM, Cavalcanti IMF, Galdino SL, Pitta IR, do Carmo A. Lima M, Pitta MGR, Hernandes MZ, Santos-Magalhães NS. Enhanced antiproliferative activity of the new anticancer candidate LPSF/AC04 in cyclodextrin inclusion complexes encapsulated into liposomes. AAPS PharmSciTech 2012; 13:1355-66. [PMID: 23054982 DOI: 10.1208/s12249-012-9853-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 09/10/2012] [Indexed: 11/30/2022] Open
Abstract
LPSF/AC04 (5Z)-[5-acridin-9-ylmethylene-3-(4-methyl-benzyl)-thiazolidine-2,4-dione] is an acridine-based derivative, part of a series of new anticancer agents synthesized for the purpose of developing more effective and less toxic anticancer drugs. However, the use of LPSF/AC04 is limited due to its low solubility in aqueous solutions. To overcome this problem, we investigated the interaction of LPSF/AC04 with hydroxypropyl-β-cyclodextrin (HP-β-CyD) and hydroxypropyl-γ-cyclodextrin (HP-γ-CyD) in inclusion complexes and determine which of the complexes formed presents the most significant interactions. In this paper, we report the physical characterization of the LPSF/AC04-HP-CyD inclusion complexes by thermogravimetric analysis, differential scanning calorimetry, infrared spectroscopy absorption, Raman spectroscopy, (1)HNMR, scanning electron microscopy, and by molecular modeling approaches. In addition, we verified that HP-β-CyD complexation enhances the aqueous solubility of LPSF/AC04, and a significant increase in the antiproliferative activity of LPSF/AC04 against cell lines can be achieved by the encapsulation into liposomes. These findings showed that the nanoencapsulation of LPSF/AC04 and LPSF/AC04-HP-CyD inclusion complexes in liposomes leads to improved drug penetration into the cells and, as a result, an enhancement of cytotoxic activity. Further in vivo studies comparing free and encapsulated LPSF/AC04 will be undertaken to support this investigation.
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Cadena PG, Pereira MA, Cordeiro RBS, Cavalcanti IMF, Barros Neto B, Pimentel MDCCB, Lima Filho JL, Silva VL, Santos-Magalhães NS. Nanoencapsulation of quercetin and resveratrol into elastic liposomes. Biochim Biophys Acta 2012; 1828:309-16. [PMID: 23103506 DOI: 10.1016/j.bbamem.2012.10.022] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 09/02/2012] [Accepted: 10/19/2012] [Indexed: 01/05/2023]
Abstract
Based on the fact that quercetin (QUE) and resveratrol (RES) induce a synergic inhibition of the adipogenesis and increase apoptosis in adipocytes, and that sodium deoxycholate (SDC) has necrotic effects, the nanoencapsulation of QUE and RES into SDC-elastic liposomes is proposed as a new approach for dissolving the subcutaneous fat. The concentration of constituents and the effect of the drug incorporation into cyclodextrin inclusion complexes on the stability of QUE/RES-loaded liposomes were studied. The best liposomal formulation reduced the use of phosphatidylcholine and cholesterol in 17.7% and 68.4%, respectively. Liposomes presented a mean diameter of 149nm with a polydispersion index of 0.3. The zeta potential of liposomes was slightly negative (-13.3mV) due to the presence of SDC in the phospholipid bilayer. Encapsulation efficiency of QUE and RES into liposomes was almost 97%. To summarize, QUE/RES-loaded elastic liposomes are stable and suitable for subcutaneous injection, thereby providing a new strategy for reducing subcutaneous fat.
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Affiliation(s)
- Pabyton G Cadena
- Universidade Federal de Pernambuco (UFPE), Laboratório de Imunopatologia Keizo-Asami (LIKA), Av. Prof. Moraes Rego, 1235, Cidade Universitária, 50670-901, Recife, PE, Brazil
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Damasceno BPGL, Dominici VA, Urbano IA, Silva JA, Araújo IB, Santos-Magalhães NS, Silva AKA, Medeiros AC, Oliveira AG, Egito EST. Amphotericin B Microemulsion Reduces Toxicity and Maintains the Efficacy as an Antifungal Product. J Biomed Nanotechnol 2012; 8:290-300. [DOI: 10.1166/jbn.2012.1374] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lira MCB, Santos-Magalhães NS, Nicolas V, Marsaud V, Silva MPC, Ponchel G, Vauthier C. Cytotoxicity and cellular uptake of newly synthesized fucoidan-coated nanoparticles. Eur J Pharm Biopharm 2011; 79:162-70. [PMID: 21349331 DOI: 10.1016/j.ejpb.2011.02.013] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [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: 09/22/2010] [Revised: 02/07/2011] [Accepted: 02/15/2011] [Indexed: 10/18/2022]
Abstract
The aim was to synthesize and characterize fucoidan-coated poly(isobutylcyanoacrylate) nanoparticles. The nanoparticles were prepared by anionic emulsion polymerization (AEP) and by redox radical emulsion polymerization (RREP) of isobutylcyanoacrylate using fucoidan as a new coating material. The nanoparticles were characterized, and their cytotoxicity was evaluated in vitro on J774 macrophage and NIH-3T3 fibroblast cell lines. Cellular uptake of labeled nanoparticles was investigated by confocal fluorescence microscopy. Results showed that both methods were suitable to prepare stable formulations of fucoidan-coated PIBCA nanoparticles. Stable dispersions of nanoparticles were obtained by AEP with up to 100% fucoidan as coating material. By the RREP method, stable suspensions of nanoparticles were obtained with only up to 25% fucoidan in a blend of polysaccharide composed of dextran and fucoidan. The zeta potential of fucoidan-coated nanoparticles was decreased depending on the percentage of fucoidan. It reached the value of -44 mV for nanoparticles prepared by AEP with 100% of fucoidan. Nanoparticles made by AEP appeared more than four times more cytotoxic (IC(50) below 2 μg/mL) on macrophages J774 than nanoparticles made by RREP (IC(50) above 9 μg/mL). In contrast, no significant difference in cytotoxicity was highlighted by incubation of the nanoparticles with a fibroblast cell line. On fibroblasts, both types of nanoparticles showed similar cytotoxicity. Confocal fluorescence microscopy observations revealed that all types of nanoparticles were taken up by both cell lines. The distribution of the fluorescence in the cells varied greatly with the type of nanoparticles.
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Affiliation(s)
- M C B Lira
- Centro de Ciências Biológicas, Universidade Federal de Pernambuco, Recife, Brazil
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Araújo RVS, Melo-Júnior MR, Beltrão EIC, Mello LA, Iacomini M, Carneiro-Leão AMA, Carvalho LB, Santos-Magalhães NS. Evaluation of the antischistosomal activity of sulfated α-D-glucan from the lichen Ramalina celastri free and encapsulated into liposomes. Braz J Med Biol Res 2011; 44:311-8. [PMID: 21344137 DOI: 10.1590/s0100-879x2011007500014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Accepted: 01/06/2011] [Indexed: 11/22/2022]
Abstract
The antischistosomal activity of the sulfated polysaccharide α-D-glucan (Glu.SO(4)) extracted from Ramalina celastri was evaluated after encapsulation into liposomes (Glu.SO(4)-LIPO) in Schistosoma mansoni-infected mice. The effect of treatment with Glu.SO(4) and Glu.SO(4)-LIPO (10 mg/kg) on egg elimination, worm burden and hepatic granuloma formation was assessed using female albino Swiss mice, 35-40 days of age, weighing 25 ± 2 g, infected with 150 cercariae/animal (Biomphalaria glabrata, BH strain). Four groups (N = 10) were studied, two controls (empty liposomes and NaCl) and two treated groups (Glu.SO(4)-LIPO and Glu.SO(4)) using a single dose. Parasitological analysis revealed that Glu.SO(4)-LIPO was as efficient as Glu.SO(4) in reducing egg elimination and worm burden. Treatment with free Glu.SO(4) and Glu.SO(4)-LIPO induced a statistically significant reduction in the number of granulomas (62 and 63%, respectively). Lectin histochemistry showed that wheat germ agglutinin intensely stained the egg-granuloma system in all treated groups. On the other hand, peanut agglutinin stained cells in the control groups, but not in the treated groups. The present results suggest a correlation between the decreasing number of hepatic egg-granulomas and the glycosylation profile of the egg-granuloma system in animals treated with free Glu.SO(4) or Glu.SO(4)-LIPO.
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Affiliation(s)
- R V S Araújo
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco, Recife, PE, Brasil.
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Lira MCB, Siqueira-Moura MP, Rolim-Santos HML, Galetti FCS, Simioni AR, Santos NP, Tabosa Do Egito ES, Silva CL, Tedesco AC, Santos-Magalhães NS. In vitrouptake and antimycobacterial activity of liposomal usnic acid formulation. J Liposome Res 2009; 19:49-58. [PMID: 19515007 DOI: 10.1080/08982100802564628] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The cellular uptake and antimycobacterial activity of usnic acid (UA) and usnic acid-loaded liposomes (UA-LIPOs) were assessed on J774 macrophages. The minimal inhibitory concentration (MIC) and the minimal bactericidal concentration (MBC) of UA and UA-LIPO against Mycobacterium tuberculosis were determined. Concentrations required to inhibit 50% of cell proliferation (IC(50)) were 22.5 (+/-0.60) and 12.5 (+/-0.26) microg/ml, for UA and UA-LIPO, respectively. The MICs of UA and UA-LIPO were 6.5 and 5.8 microg/mL, respectively. The MBC of UA-LIPO was twice as low (16 microg/mL) as that of UA (32 microg/mL). An improvement in the intracellular uptake of UA-LIPO was found (21.6 x 10(4) +/- 28.3 x 10(2) c.p.s), in comparison with UA (9.5 x 10(4) +/- 11.4 x 10(2) c.p.s). In addition, UA-LIPO remains much longer inside macrophages (30 hours). All data obtained from the encapsulation of usnic acid into liposomes as a drug delivery system (DDS) indicate a strong interaction between UA-liposomes and J774 macrophages, thereby facilitating UA penetration into cells. Considering such a process as ruling the Mycobacterium-transfection by magrophages, we could state that associating UA with this DDS leads to an improvement in its antimycobacterial activity.
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Affiliation(s)
- Mariane C B Lira
- Universidade Federal de Pernambuco, Laboratório de Imunopatologia Keizo-Asami, Recife-PE, Brazil
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Silva KGH, Júnior FHX, Farias IEG, Silva AKA, Neto JAC, Souza LCA, Santiago RR, Júnior FA, Júnior TN, Soares LAL, Santos-Magalhães NS, Egito EST. Stationary cuvette: a new approach to obtaining analytical curves by UV-VIS spectrophotometry. Phytochem Anal 2009; 20:265-271. [PMID: 19333915 DOI: 10.1002/pca.1122] [Citation(s) in RCA: 7] [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: 05/27/2023]
Abstract
BACKGROUND Investigations in the field of pharmaceutical analysis and quality control of medicines require analytical procedures that achieve suitable performance. An analytical curve is one of the most important steps in the chemical analysis presenting a direct relationship to features such as linearity. OBJECTIVE This study has the aim of developing a new methodology, the stationary cuvette, to derive analytical curves by spectroscopy for drug analysis. METHODOLOGY The method consists basically of the use of a cuvette with a path length of 10 cm, containing a constant volume of solvent in which increasing amounts of a stock solution of the sample are added, droplet by droplet. After each addition, the cuvette is stirred and the absorbance is measured. This procedure was compared with the currently used methodology, which requires a labour-intensive dilution process, and possible sources of variation between them were evaluated. RESULTS The results demonstrated that the proposed technique presented high sensitivity and similar reproducibility compared with the conventional methodology. In addition, a number of advantages were observed, such as user-friendliness, cost-effectiveness, accuracy, precision and robustness. CONCLUSION The stationary cuvette approach may be considered to be an appropriate alternative to derive analytical curves for analysing drug content in raw materials and medicines through UV-VIS spectrophotometry.
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Affiliation(s)
- K G H Silva
- Programa de Pós-graduação em Ciências da Saúde, Universidade Federal do Rio Grande do Norte, Natal-RN, Brazil
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Andrade CA, Oliveira MD, Santos-Magalhães NS, Correia MT, de Melo CP. Comparison of the interfacial properties of Eugenia uniflora and Triticum vulgaris lectins. Colloids Surf B Biointerfaces 2009; 68:7-12. [DOI: 10.1016/j.colsurfb.2008.08.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 08/14/2008] [Accepted: 08/22/2008] [Indexed: 10/21/2022]
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Abstract
In the present study, poly (D,L-lactic-co-glycolic)-acid microspheres containing trans-Dehydrocrotonin (DCTN) were prepared by the double emulsion method. The hypoglycemic activity of DCTN-loaded microspheres was monitored in normal glycemic mice after administration of a daily dose of DCTN (50 mg kg(-1) body weight) for 7 days. Spherical microspheres with two populations of particles with 3.20 +/- 0.10 and 7.60 +/- 0.70 microm mean diameter size microm were observed. The encapsulation efficiency of DCTN was 85.5 +/- 3.9%. The in vitro kinetic profile of DCTN from PLGA-microspheres was initially fast (burst effect of 19.4% at 2 h). Such a burst step was maintained until achieving 35.7+/-2.0% at 7h, followed by a gradual release of DCTN attaining a maximum drug release at 55.7 +/- 2.6% within 30 h. DCTN was able to reduce glucose levels (14.3%) of normal glycemic animals and this effect was improved by its encapsulation into microspheres (26.8%). The optimum glucose levels in the blood of animals treated with DCTN suspension and DCTN-loaded microspheres were 119.21 +/- 19.75 mg dL(-1) at day 5 and 103.08 +/- 18.88 mg dL(-1) at day 7, respectively. DCTN-loaded microspheres are thus offered as a potential delivery system for the treatment of metabolic diseases characterized by hyperglycemia.
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Affiliation(s)
- Waldenice A Morais
- Universidade Federal de Pernambuco (UFPE), Laboratório de Imunopatologia Keizo-Asami (LIKA), Recife, PE, Brazil
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Oliveira MDL, Andrade CAS, Santos-Magalhães NS, Coelho LCBB, Teixeira JA, Carneiro-da-Cunha MG, Correia MTS. Purification of a lectin from Eugenia uniflora L. seeds and its potential antibacterial activity. Lett Appl Microbiol 2008; 46:371-6. [PMID: 18266644 DOI: 10.1111/j.1472-765x.2007.02319.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS The aim of this work was to analyse the antimicrobial properties of a purified lectin from Eugenia uniflora L. seeds. METHODS AND RESULTS The E. uniflora lectin (EuniSL) was isolated from the seed extract and purified by ion-exchange chromatography in DEAE-Sephadex with a purification factor of 11.68. The purified lectin showed a single band on denaturing electrophoresis, with a molecular mass of 67 kDa. EuniSL agglutinated rabbit and human erythrocytes with a higher specificity for rabbit erythrocytes. The haemagglutination was not inhibited by the tested carbohydrates but glycoproteins exerted a strong inhibitory action. The lectin proved to be thermo resistant with the highest stability at pH 6.5 and divalent ions did not affect its activity. EuniSL demonstrated a remarkable nonselective antibacterial activity. EuniSL strongly inhibited the growth of Staphylococcus aureus, Pseudomonas aeruginosa and Klebsiella sp. with a minimum inhibitory concentration (MIC) of 1.5 microg ml(-1), and moderately inhibited the growth of Bacillus subtilis, Streptococcus sp. and Escherichia coli with a MIC of 16.5 microg ml(-1). CONCLUSIONS EuniSL was found to be effective against bacteria. SIGNIFICANCE AND IMPACT OF THE STUDY The strong antibacterial activity of the studied lectin indicates a high potential for clinical microbiology and therapeutic applications.
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Affiliation(s)
- M D L Oliveira
- Departamento de Bioquímica - Laboratório de Glicoproteínas, Universidade Federal de Pernambuco, Recife, PE, Brazil
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Andrade CAS, Baszkin A, Santos-Magalhães NS, Coelho LCBB, de Melo CP. Mixed monolayers of Bauhinia monandra and concanavalin A lectins with phospholipids, part II. J Colloid Interface Sci 2006; 289:379-85. [PMID: 15992806 DOI: 10.1016/j.jcis.2005.05.063] [Citation(s) in RCA: 12] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2004] [Revised: 04/06/2005] [Accepted: 05/12/2005] [Indexed: 11/21/2022]
Abstract
Isotherms of surface pressure and surface potential versus mean molecular area for dibehenoylphosphatidylcholine (DBPC), dipalmitoylphosphatidylcholine (DPPC), dipalmitoylphosphatidylethanolamine (DPPE), and dioleoylphosphatidylcholine (DOPC) monolayers were shown to be greatly modified when these lipids were cospread with either Bauhinia monandra (BmoLL) or Concanavalin A (Con A) lectins. For the binary films of DBPC, DPPC, and DPPE cospread with each of these two lectins, there was both a displacement of the Pi-A and DeltaV-A isotherms toward higher molecular areas relative to pure lipids and an increase in the maximum surface potential values relative to the DeltaV-A relationships observed for the corresponding single-lectin systems. Both effects can be understood in terms of the occurrence of an explicit interaction between the lipids and the lectins. The plots of the corresponding compressibilities versus molecular areas reveal that, for all lipids but DOPC, the extent of this interaction was always larger for BmoLL than for Con A. The DPPC and DPPE mixed films with BmoLL differed in compressibility. Owing to the small DPPE polar headgroup, the DPPE-BmoLL film was much more incompressible than the DPPC-BmoLL mixed monolayer. However, for the DOPC-BmoLL and DOPC-Con A mixed films there was no evidence that an interaction between the lectins and the lipid took place, a fact attributed to the unsaturated character in the DOPC aliphatic chains, which leads to an expanded Pi-A isotherm.
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Affiliation(s)
- Cesar A S Andrade
- Pós-Graduação em Ciência de Materiais, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
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Andrade CAS, Baszkin A, Santos-Magalhães NS, Coelho LCBB, de Melo CP. Dielectric properties of Bauhinia monandra and concanavalin A lectin monolayers, part I. J Colloid Interface Sci 2006; 289:371-8. [PMID: 16026793 DOI: 10.1016/j.jcis.2005.01.076] [Citation(s) in RCA: 10] [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] [Received: 11/21/2004] [Revised: 01/17/2005] [Accepted: 01/24/2005] [Indexed: 10/25/2022]
Abstract
The dielectric properties of the galactose-binding lectins Bauhinia monandra (BmoLL) and Concanavalin A (Con A) were assessed by surface potential measurements of their spread monolayers on an aqueous subphase containing a monovalent electrolyte. For both lectins the curves of surface potential versus mean molecular area (DeltaV-A) and the independently recorded isotherms of surface pressure versus mean molecular area (Pi-A) were shown to be pH-dependent. As the subphase pH changed from 2 to 9, a noticeable trend to higher surface pressures accompanied the compression of the monolayers. Conversely, the surface potentials values of both monolayers decreased with increasing pH. For Con A, with the single exception of the pH 9 case, lowering the pH yielded DeltaV values higher than those for BmoLL. The contribution of the electric double layer (Psi0) to the overall DeltaV values at a given Pi (15 mN/m) was calculated using a modified Davies equation and assuming that at this surface pressure the monolayers of both studied lectins were stable. While at all studied pHs the Psi0 values for Con A exceeded those calculated for BmoLL, for both lectins they were insensitive to pH changes. This provided evidence that the reorientation of lectin molecules, during compression predominantly contributed to the alteration of the overall DeltaV values. The calculated Psi0 values made possible the evaluation of the dipole moments for BmoLL and Con A, and it has been estimated that the decrease in the pH of the subphase from 9 to 2 produced a 1.6-fold (twofold) increase in the value of for BmoLL (Con A). The differences in dielectric properties between the two film-forming lectins have been attributed to the differences in their structures. Indeed, the circular dichroism (CD) spectrum of Con A showed the predominance of beta-plated sheet structures while that of BmoLL was typically rich in alpha-helix structures.
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Affiliation(s)
- Cesar A S Andrade
- Pós-Graduação em Ciência de Materiais, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil
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Andrade CAS, Santos-Magalhães NS, de Melo CP. Thermodynamic characterization of the prevailing molecular interactions in mixed floating monolayers of phospholipids and usnic acid. J Colloid Interface Sci 2006; 298:145-53. [PMID: 16414064 DOI: 10.1016/j.jcis.2005.11.066] [Citation(s) in RCA: 15] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2005] [Revised: 11/23/2005] [Accepted: 11/28/2005] [Indexed: 10/25/2022]
Abstract
The investigation of the characteristics of mixed floating monolayers of phospholipids and usnic acid (UA), an active metabolite from lichens, can provide valuable information on how to prepare stable liposomes that could serve as carriers of UA for therapeutic proposes. The present paper is concerned with the thermodynamic analysis of the behavior of Langmuir monolayers formed by mixing different phospholipids (dibehenoylphosphatidylcholine, DBPC, dipalmitoylphosphatidylcholine, DPPC, and dioleoylphosphatidylcholine, DOPC) and UA at varied molar fractions. Relevant thermodynamic parameters such as excess areas, excess free energies and free energy of mixing were derived from the surface pressure data obtained from compression measurements performed in a Langmuir trough. For the largest lateral pressure examined (25 mN/m), negative values of the excess free energy were found only for the DOPC/UA monolayer, which should be the most stable of them. Based on the calculated values of the free energy of mixing, we note that the DBPC/UA and DPPC/UA systems present the best mixed character at low pressures and when the molar fraction of the UA is 0.5; at that relative concentration and at low values of the external pressure, the UA molecules can better mix and interact with the phospholipid molecules. The compression isotherms for mixed monolayers show no visible transitions, exhibiting a more organized phase that corresponds to a negative free energy of mixing. We have established that the most stable monolayers were those corresponding to DOPC/UA mixtures with a UA molar fraction of 0.75.
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Affiliation(s)
- Cesar A S Andrade
- Pós-Graduação em Ciência de Materiais, Universidade Federal de Pernambuco (UFPE), 50670-901 Recife PE, Brazil
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Sousa FB, Vianna SS, Santos-Magalhães NS. A new approach for improving the birefringence analysis of dental enamel mineral content using polarizing microscopy. J Microsc 2006; 221:79-83. [PMID: 16499547 DOI: 10.1111/j.1365-2818.2006.01547.x] [Citation(s) in RCA: 20] [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
The main problem in interpreting birefringence of dental enamel under polarizing microscopy is the lack of physical constants able to allow the Wiener equation to be applied directly to the composition of such tissue. The present study introduces a new approach to circumvent this constraint. Because the nonmineral phase of enamel is heterogeneous, its refractive index can be computed in terms of its components (namely, water, which is partially replaced by the immersion medium, and organic matter), thereby providing a more acceptable refractive index to be used in the Wiener equation. Furthermore, the enamel mineral volume is ordinarily calculated on the basis of the density 3.15 g cm(-3). The density 2.99 g cm(-3) has been, however, reported to be more accurate for enamel hydroxyapatite, so enamel mineral volumes from selected published data were converted using such a density. The birefringence of mature enamel computed by the Wiener equation, taking into account the above refinements, matched, for the first time, published experimental birefringence values. The theoretical water and organic contents were also consistent with published experimental data. Thus, a direct application of the Wiener equation to the enamel composition has now been achieved. It is speculated that quantitative data on the mineral, the water and the organic contents of mature dental enamel can be derived from interpretation of birefringence in two immersion media (obtained before and after extraction of the organic matter) with this new approach.
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Affiliation(s)
- F B Sousa
- Departamento de Morfologia, Centro de Ciências da Saude, Universidade Federal da Paraiba, Cidade Universitaria, 58051-900, Joao Pessoa, Paraiba, Brazil.
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Mayer M, O'Neill MA, Murray KE, Santos-Magalhães NS, Carneiro-Leão AMA, Thompson AM, Appleyard VCL. Usnic acid: a non-genotoxic compound with anti-cancer properties. Anticancer Drugs 2005; 16:805-9. [PMID: 16096427 DOI: 10.1097/01.cad.0000175588.09070.77] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [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: 11/26/2022]
Abstract
The majority of human tumors bear inactive p53 or cellular factors that down-regulate the expression and activity of the p53 network. Therefore, finding therapies that are effective in such tumors is of great interest. Usnic acid, a normal component of lichens, showed activity against the wild-type p53 breast cancer cell line MCF7 as well as the non-functional p53 breast cancer cell line MDA-MB-231 and the lung cancer cell line H1299 (null for p53). In MCF7 cells treated with usnic acid, although there was an accumulation of p53 and p21 proteins, the transcriptional activity of p53 remained unaffected. We also found that there was no phosphorylation of p53 at Ser15 after treatment of MCF7 cells with usnic acid, suggesting that the oxidative stress and disruption of the normal metabolic processes of cells triggered by usnic acid does not involve DNA damage. The property of usnic acid as a non-genotoxic anti-cancer agent that works in a p53-independent manner makes it a potential candidate for novel cancer therapy.
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Affiliation(s)
- Margareth Mayer
- Departamento de Morfologia e Fisiologia Animal, Universidade Federal de Pernambuco, Recife, PE, Brasil
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Ribeiro-Costa RM, Alves AJ, Santos NP, Nascimento SC, Gonçalves ECP, Silva NH, Honda NK, Santos-Magalhães NS. In vitro and in vivo properties of usnic acid encapsulated into PLGA-microspheres. J Microencapsul 2005; 21:371-84. [PMID: 15513745 DOI: 10.1080/02652040410001673919] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [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: 10/26/2022]
Abstract
Microparticles will probably play a promising role in the future of chemotherapy. These polymeric delivery systems are capable of maximizing the therapeutic activity while reducing side effects of anti-cancer agents. Usnic acid (UA) is a secondary metabolite produced by lichens, which exhibits an anti-tumour activity. In this study, PLGA-microspheres containing usnic acid from Cladonia substellata were prepared by the double emulsion method, with or without PEG as stabilizer. The morphology of the microspheres was examined by optical and scanning electron microscopy. The in vitro kinetic profile of usnic acid loaded-microspheres was carried out by dissolution testing. The usnic acid content was analysed by HPLC. The cytotoxicity of free and encapsulated usnic acid was evaluated against HEp-2 cells using the MTT method. The anti-tumour assay was performed in mice against Sarcoma-180 tumour (UA 15 mg kg(-1) weight body/day) during 7 days. Animals were then sacrificed and tumour and organs were excised for histopathological analysis. Microspheres presented a smooth spherical surface with a mean diameter of 7.02 +/- 2.72 microm. The usnic acid encapsulation efficiency was approximately 100% (UA 10 mg 460 mg(-1) microspheres). A maximum release of 92% was achieved at the fifth day. The IC50 values for free and encapsulated usnic acid were 12 and 14 microg ml(-1), respectively. The encapsulation of usnic acid into microspheres promoted an increase of 21% in the tumour inhibition as compared with the free usnic acid treatment. In summary, usnic acid was efficiently encapsulated into PLGA-microspheres and the microencapsulation improved its anti-tumour activity.
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Affiliation(s)
- R M Ribeiro-Costa
- Laboratório de Imunopatologia Keizo-Asami (LIKA), Universidade Federal de Pernambuco (UFPE), Recife, PE, Brazil
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Andrade CAS, Correia MTS, Coelho LCBB, Nascimento SC, Santos-Magalhães NS. Antitumor activity of Cratylia mollis lectin encapsulated into liposomes. Int J Pharm 2004; 278:435-45. [PMID: 15196647 DOI: 10.1016/j.ijpharm.2004.03.028] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2003] [Revised: 03/30/2004] [Accepted: 03/30/2004] [Indexed: 11/23/2022]
Abstract
The hemagglutinating (HA) activity of Cratylia mollis lectin (Cra) was evaluated and the influence of ultrasound and mechanical agitation on its activity examined. The antitumor activity of Cra-loaded liposomes was also investigated. Liposomes were obtained by the lipid thin film method. Physicochemical characterization was carried out and long-term stability of Cra-loaded liposomes assessed. Antitumor activity of Cra-loaded liposomes was investigated against Sarcoma 180 in Swiss mice. The treatment was performed intraperitoneally (7 mg/kg body weight per day) for 7 days. Histopathological analyses of tumor, liver, spleen and kidneys were carried out after treatment of the animals. The results showed that Cra-HA activity is affected under ultrasound exposure. However, Cra was successfully encapsulated into liposomes and the activity of the lectin was preserved despite the use of ultrasound in the liposome preparation. Cra-loaded liposomes were produced with an 84% encapsulation ratio (700 microg/ml) and a tumor inhibition of 71% was achieved. The encapsulation of Cra produced a decrease in its tissue toxicity and improved its antitumor activity. In particular, histopathological analysis revealed that treatment with Cra-loaded liposomes prevented Cra cytotoxicity in the liver and kidney of animals.
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Affiliation(s)
- Cesar A S Andrade
- Laboratório de Imunopatologia Keizo-Asami, Universidade Federal de Pernambuco, Grupo de Sistemas de Liberação Controlada de Medicamentos, Cidade Universitária, Recife, PE, Brazil
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Rodrigues JS, Santos-Magalhães NS, Coelho LCBB, Couvreur P, Ponchel G, Gref R. Novel core(polyester)-shell(polysaccharide) nanoparticles: protein loading and surface modification with lectins. J Control Release 2003; 92:103-12. [PMID: 14499189 DOI: 10.1016/s0168-3659(03)00296-7] [Citation(s) in RCA: 84] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
This study describes new lectin-decorated or protein-loaded nanoparticles with a hydrophobic poly(epsilon-caprolactone) (PCL) core and a hydrophilic dextran (Dex) corona. In this view, a family of block Dex-PCLn copolymers was first synthesized, consisting of a Dex backbone to which n preformed PCL blocks were grafted. The ability of these new copolymers to form nanoparticles was evaluated in comparison with a series of PCL homopolymers of various molecular weights (2000, 10,000 and 40,000 g/mole). Two different nanoparticle preparation methods have been developed and tested for their efficacy to incorporate proteins. For this, three proteins were used: a model protein, bovine serum albumin (BSA), a lectin from leaves of Bauhinia monandra (BmoLL) and Lens culinaris (LC) lectin. All these proteins were successfully incorporated in nanoparticles with a mean diameter around 200 nm. Lectins could also be adsorbed onto the surface of Dex-PCLn nanoparticles. Surface-bound BmoLL conserved its hemagglutinating activity, suggesting the possible application of this type of surface-modified nanoparticles for targeted oral administration. Caco-2 cellular viability was higher than 70% when put in contact with Dex-PCLn nanoparticles, even at concentrations as high as 660 microg/ml.
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Affiliation(s)
- J S Rodrigues
- Universidade Federal de Pernambuco, Departamento de Bioquímica, Laboratório de Imunopatologia Keizo-Asami, Recife, Brazil
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Santos-Magalhães NS, Pontes A, Cavalcante RM, Costa RM, Rangel FA, Guimarães MI, de Carvalho JN, de Souza SD, de Oliveira HM, Esteves IL, Ramalho MS, Vieira SL, Alves AJ. Bioequivalence of two lamivudine tablet formulations. Arzneimittelforschung 2001; 51:310-4. [PMID: 11367872 DOI: 10.1055/s-0031-1300043] [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] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The present study describes the determination of the bioavailability of a new commercial tablet formulation of lamivudine (CAS 134678-17-4) compared with a reference formulation. The comparative bioequivalence of the test and a reference formulation (each 3 x 150 mg) was assessed in 24 healthy volunteers by means of a randomized two-way crossover design. Prior to the study both the test and reference formulations were examined for conformation to chromatographic purity and drug content. Each volunteer received the test (T) and the reference formulation (R) with a one-week drug-free interval between administrations. The plasma concentrations of T were monitored over a period of 12 h after drug administration using a sensitive HPLC method. Pharmacokinetic parameters for T were determined from plasma concentration-time data. Statistical tests were carried out at 90% confidence intervals using a parametric method (three-way ANOVA) for AUC and Cmax, and non-parametric method for Tmax. The present study showed that both formulations were bioequivalent for the geometric mean of AUC(0-12), AUC0-infinity), Cmax, and Tmax at the 90% confidence interval. The bioavailability of the test (%) was 96.7, 93.3, 99.7, 100.3, respectively. The T:R ratio was, in each case, well within the acceptable range of 100 +/- 20%.
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Affiliation(s)
- N S Santos-Magalhães
- Laboratório de Tecnologia Quimico-Farmacêutica (LTQF), Departamento de Farmácia, Universidade Federal de Pernambuco, Pernambuco, Brasil
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Abstract
The main purpose of this work is to formulate benzathine penicillin G nanoemulsion and nanocapsules, to evaluate their physicochemical and stabilising characteristics, and to determine their antimicrobial activity and penicillin in vitro release kinetics. Nanoemulsions were produced by the spontaneous emulsification approach and nanocapsules of poly (D,L-lactic acid-co-glycolic acid) polymer (PLGA) were prepared by the method of interfacial deposition of a pre-formed polymer. A 207+/-8 nm mean diameter nanoemulsion formulation maintained stability for more than 5 months at 4 degrees C. Stable nanocapsules with 224+/-58 nm mean diameter were obtained, which remained stabilised over 120 days at 4 degrees C. The penicillin encapsulation ratio in the nanocapsules was 85%. The in vitro release profiles indicated that penicillin released from the nanoemulsion was similar to the one observed from nanocapsules. However it can be clearly deduced from the in vitro kinetic analysis that the antibiotic cannot be protected in colloidal delivery systems. Nevertheless, stable formulations obtained in this investigation supply a potential dosage form to encapsulate more easily soluble drugs.
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Affiliation(s)
- N S Santos-Magalhães
- Laboratório de Tecnologia Químico-Farmacêutica (LTQF), Departamento de Farmácia, Universidade Federal de Pernambuco, Av Prof. Artur Sá, s/n, Cidade Universitária, 50740-520, PE, Recife, Brazil.
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