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1.
Healthcare (Basel) ; 12(12)2024 Jun 19.
Artículo en Inglés | MEDLINE | ID: mdl-38921335

RESUMEN

We evaluated the long-term risks of overall cancer and all-cause mortality associated with five types of phytopharmaceuticals and the most commonly used estrogen-progestogen medications for the treatment of postmenopausal syndrome in women. Using data from Taiwan's National Health Insurance Research Database (NHIRD) from 1 January 2000 to 31 December 2018, we conducted a 1:2 matched cohort study with 12,087 eligible patients. We compared phytopharmaceuticals -only users (n = 4029, phytopharmaceuticals group) with HRT-only users (n = 8058, HRT group) with a washout period of ≥6 months. The phytopharmaceuticals group had significantly lower risks of overall cancer and all-cause mortality than the HRT group (adjusted hazard ratio [95% confidence interval]: 0.60 [0.40-0.9] and 0.40 [0.16-0.99], respectively) after over 180 days of use. Bupleurum and Peony Formula were associated with lower risks of overall cancer and all-cause mortality (aHR: 0.57 [0.36-0.92] and 0.33 [0.11-1.05], respectively). In conclusion, phytopharmaceuticals may serve as an alternative therapy to HRT for alleviating menopausal symptoms and reducing health risks, leading to more favorable long-term health outcomes. Further randomized control trials are necessary to validate the findings of this study.

2.
Environ Toxicol ; 39(9): 4298-4307, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-38717028

RESUMEN

Salmonella infections are a serious global health concern, particularly in developing countries, and are further exacerbated by the emergence of antibiotic resistance. San-Huang-Xie-Xin-Tang (SHXXT), a traditional herbal medicine with potent anti-inflammatory properties, has recently gained attention as an alternative treatment. Our study emphasizes on the importance of precise timing in accordance with traditional Chinese medicine principles. A mouse infection model was established while different administration times of SHXXT were recorded for the body weight, clinical scores, bacterial counts in blood, and organs. Additionally, cytokine levels, fatty acids, and amino acids in the serum were also monitored. We found that administering SHXXT 1 day after Salmonella enterica subsp. enterica serovar Typhimurium (S. Typhimurium) infection (T1 group) leads to positive outcomes. This includes restoration of body weight, improved clinical scores, and reduced bacterial counts in blood and vital organs. Interferon-gamma levels remained consistently high across all treatment groups 6 days post-infection. However, the T1 group showed exclusive suppression of serum levels of tumor necrosis factor-alpha (TNF-α) and interleukin-1 beta (IL-1ß). The timing of administration significantly influenced serum fatty acid concentrations, countering Salmonella-induced disruptions, aligning with TNF-α and IL-1ß levels. SHXXT had also restored amino acid profiles disrupted by the infection, with notable effects when administered at the correct timing. Our research highlights SHXXT's potential in treating S. Typhimurium infection, emphasizing the importance of precise timing in line with traditional Chinese medicine principles for effective treatment at different disease stages.


Asunto(s)
Medicamentos Herbarios Chinos , Salmonella typhimurium , Animales , Salmonella typhimurium/efectos de los fármacos , Medicamentos Herbarios Chinos/administración & dosificación , Medicamentos Herbarios Chinos/farmacología , Ratones , Infecciones por Salmonella/tratamiento farmacológico , Infecciones por Salmonella/microbiología , Citocinas/sangre , Citocinas/metabolismo , Femenino , Masculino , Ratones Endogámicos BALB C
3.
Int Immunopharmacol ; 112: 109273, 2022 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-36183678

RESUMEN

BACKGROUND: Nuclear factor erythroid 2-related factor 2 (NFE2L2) plays a critical role in ferroptosis and biogenesis, however, its role in cervical squamous cell carcinoma (CESC) remains unknown. Therefore, in this study, we aimed to determine the role of NFE2L2 in CESC using multiomic analysis. METHODS: All raw data were downloaded from The Cancer Genome Atlas (TCGA) and further validated in our dataset. NFE2L2 mRNA expression and methylation data on CESC were examined using the Tumor Immune Estimation Resource (TIMER) and University of Alabama at Birmingham Cancer Data Analysis Portal (UALCAN) database resources. NFE2L2 expression was examined in paraffin-embedded tissues from our cohort of 240 samples each of cancerous and non-cancerous tissues. Further, cervical cancer biopsies were genetically validated. TIMER and Tumor-Immune System Interactions Database (TISIDB) were used to analyze the correlation between NFE2L2 and cluster of differentiation 163 (CD163) with co-expressed genes in tumor-infiltrating immune cells. RESULTS: The mRNA and protein levels of NFE2L2 were lower in CESC tissues than they were in adjacent tissues. Importantly, a low NFE2L2 level correlated with poor prognosis in CESC patients. NFE2L2 was specifically expressed in tumor macrophages and correlated with the tumor immune landscape and poor prognosis in the cohort data. The Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway and Gene Ontology (GO) enrichment analysis showed that co-expressed genes are mainly associated with multiple immune-related pathways. Furthermore, our data analysis revealed that NFE2L2 and macrophage CD163 expression levels were negatively correlated. Interestingly, we discovered multiple NFE2L2 binding sites in promoters of CD163. CONCLUSION: This study confirmed the novel pyroptosis landscape in CESC, provided a role for NFE2L2 in the tumor microenvironment, and identified prognostic biomarkers for CESC and related immune infiltration.


Asunto(s)
Carcinoma de Células Escamosas , Ferroptosis , Neoplasias del Cuello Uterino , Femenino , Humanos , Biomarcadores , Carcinoma de Células Escamosas/metabolismo , Ferroptosis/genética , Macrófagos/metabolismo , Pronóstico , ARN Mensajero/genética , Microambiente Tumoral/genética , Neoplasias del Cuello Uterino/metabolismo
4.
J Oncol ; 2022: 9854788, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35132321

RESUMEN

Mutations in the isocitrate dehydrogenase gene (IDH1) are involved in the progression of tumors. Although IDH1 has a role in various tumors, its clinical relevance and its expression in response to the immune response have not been investigated in prostate adenocarcinoma (PRAD). In the present study, we investigated the utility of IDH1 as a prognostic biomarker for PRAD by analyzing IDH1 mRNA expression and its association with patient survival and immune cell infiltration. IDH1 mRNA expression was significantly higher in PRAD tissue than in normal tissue, and Kaplan-Meier survival analysis showed that IDH1 expression was significantly associated with poor prognosis in PRAD patients. To elucidate the mechanisms involved, the correlation between IDH1 expression and the level of immune cell infiltration, in particular of immunosuppressive cells such as CD8+ T-cells, CD4+ T-cells, and macrophages, was further analyzed by single-cell RNA sequencing. We also screened a pharmacogenetic database for IDH1-specific drugs that inhibited high expression in PRAD. In the present study, we used a combination of databases to identify a significant correlation between IDH1 expression and cellular infiltration and to explain the mechanism by which IDH1 confers poor prognosis in PRAD, thus demonstrating the relevance of IDH1 expression as a prognostic biomarker with clinical utility in PRAD patients.

5.
Exp Ther Med ; 18(4): 2956-2964, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31572538

RESUMEN

Ligustrum lucidum Ait (LL), Lysimachia christinae Hance (LC), Mentha piperita Linn (MP), and Cinnamomum cassia Presl (CC) are common spices used in Asia. The present study investigated the anti-Salmonella effects of the four spices using aqueous extracts. The amount of phenolic acids and flavonoids in each spice aqueous extract was determined as indicators of purity. Mice were pretreated with LL, LC, MP or CC aqueous extract for 7 days. Following infection with Salmonella enterica serovar Typhimurium strain ST21 (ST21), the aqueous extract of each spice was subsequently administered for 4 days. ST21 infected mice had lower body weight compared with the control group. The administration of spice aqueous extracts significantly increased body weight following infection. ST21 infection increased the fecal ST21 counts compared with the control group; however, following spice aqueous extract treatments, ST21 counts significantly decreased. The spice treatments also significantly reduced ST21 count in blood and the organs. Notably, ST21 infection increased interferon (IFN)-γ and interleukin (IL)-6 levels in serum whilst spice treatments reduced these cytokines. In the spleen, spice treatment significantly lowered IFN-γ, IL-6, IL-1ß, and tumor necrosis factor (TNF)-α levels, but increased IL-12 levels. ST21 infection stimulated the production of immunoglobulin (Ig)A and IgM in serum whilst spice aqueous extract treatment significantly decreased these levels. In summary, LL and MP aqueous extract treatments had the most significant effect in protecting against ST21 infection. Results of the RAW 264.7 cell infection model suggested that the mechanisms involved in the anti-ST21 effect of each spice were individually different. All four aqueous extracts demonstrated different mechanisms in attenuating ST21 invasion with the protective effect of LC aqueous extract potentially involving TNF-α expression. The present findings suggested that the four spices may be considered as potent functional foods due to their anti-Salmonella effects.

6.
J Clin Med ; 7(9)2018 Aug 24.
Artículo en Inglés | MEDLINE | ID: mdl-30149532

RESUMEN

Poor sperm quality is one of the main factors of male infertility. Traditional Chinese Medicine (TCM) has been used frequently in clinical practice in many countries to treat a wide array of infertile problems. To further understand the effects of TCM on semen quality, we retrospectively enrolled patients with male infertility and poor semen quality at the Tainan Municipal Hospital in Taiwan between 2013 and 2016. Semen quality analysis in accordance with the WHO criteria is an essential step in the evaluation of male fertility status. Associations between the semen parameters and body mass index, smoking status, alcohol use, duration of infertility, and age were also analyzed. A total of 126 male infertility patients with abnormal semen analysis were included in this study: 50 TCM users and 13 TCM non-users. The basic characteristics of the two groups were not significantly different. TCM users account for 92.5% of the total semen improvement subjects. In conclusion, TCM supplementation may have a beneficial role as improving sperm quality for infertility patients.

7.
Biosci Biotechnol Biochem ; 82(5): 836-847, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29517465

RESUMEN

Pteris multifida (PM) and Cortex phellodendri (CP) are medicinal foods used for gastrointestinal protection. Lactic-acid bacteria are probiotics. Salmonella Typhimurium strain ST21-infected mice were used to examine the alleviative effects of two lactic-acid bacteria (LAB) as well as aqueous extracts of PM and CP for a 4-day treatment. CP and LAB decreased fecal ST counts. CP and PM reduced the ST21 count in the blood, intestine, and liver. LAB lowered the ST21 count in the intestine and spleen. CP and LAB decreased the IFN-gamma level; PM lowered the TNF-alpha level; and both LAB and PM reduced the IL-1beta level in serum. PM and CP lowered the IgG level in serum. The data in a macrophage infection model indicate that TNF-alpha was partial involved in this alleviative effects, other mechanisms might be involved. In sum, these novel findings suggest that PM, CP, and LAB probiotics are potential anti-Salmonellae agents.

8.
Exp Ther Med ; 15(3): 2388-2396, 2018 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-29456644

RESUMEN

Eudesmin has been proven to possess anti-inflammatory effects. In the present study, the effects of eudesmin on Helicobacter pylori (H. pylori)-mediated autophagy, apoptosis, immune response and inflammation were determined in human gastric adenocarcinoma (AGS) cells in vitro and in C57BL/6 mice in vivo. Detection of the production of interleukin (IL)-8, IL-1ß and immunoglobulin M (IgM) was performed using ELISA. Identification of the activation of apoptosis-associated caspase-3, -8 and -9 proteins, Bcl-2-associated X protein (Bax) and BH3 interacting domain death agonist (Bid) protein, was determined through western blot analysis. Autophagy microtubule-associated protein 1A/1B-light chain 3, isoform B (LC-3B) expression was measured using immunostaining. The results of the present study demonstrated that eudesmin inhibited the growth of H. pylori, with increased inhibition activity against antibiotic resistant strains compared with the reference strain. In addition, H. pylori-induced IL-8 secretion, LC-3B expression and apoptosis-associated protein (caspase-3, -8 and -9, Bax and Bid) activation in AGS cells was suppressed by eudesmin. Furthermore, eudesmin suppressed IL-1ß and IgM production in H. pylori-infected C57BL/6 mice in vivo. In conclusion, eudesmin may be developed as a promising therapeutic agent to prevent and/or treat H. pylori-associated gastric inflammation.

9.
J Food Sci ; 82(12): 3021-3028, 2017 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-29135040

RESUMEN

Geniposide and genipin have been found in Gardenia jasminoides Ellis, a traditional Chinese medicine that exhibits multiple biological functions. However, no report showing the effects of geniposide and genipin on gastric protection in Helicobacter pylori infections in vitro and in vivo has been done. In this study, we clarified how geniposide and genipin suppress H. pylori-mediated inflammation in gastric AGS cells and C57BL/6 mice. Our results demonstrated that genipin shows a strong ability to inhibit H. pylori growth and is able to reduce vacA and cagA gene expression of H. pylori in infected AGS cells. Genipin also attenuates the abilities of adhesion and invasion of H. pylori to AGS cells. An attenuation of interleukin (IL)-8 and IFN-γ production caused by genipin was observed to inhibit cell inflammatory responses. In the in vivo experiments, geniposide and genipin both showed suppressive effects on the vacA gene expression in mice after H. pylori infection. The serum levels of IFN-γ, IL-1ß, immunoglobulin A, and Immunoglobulin M were decreased by geniposide and genipin in infected mice. The inflammatory maker COX2 was downregulated in H. pylori-infected mice after exposure to geniposide and genipin. Together, geniposide and genipin effectively exert a healthy promotion to reduce H. pylori infections in vivo by interfering with the growth and virulence of H. pylori as well as attenuating the gastric inflammation caused by an H. pylori infection. PRACTICAL APPLICATION: Geniposide and genipin have a healthy promotion to eradicate H. pylori infections by interfering with the growth and virulence of H. pylori and to attenuate the gastric inflammation caused by an H. pylori infection.


Asunto(s)
Medicamentos Herbarios Chinos/administración & dosificación , Gardenia/química , Infecciones por Helicobacter/tratamiento farmacológico , Helicobacter pylori/efectos de los fármacos , Iridoides/administración & dosificación , Animales , Mucosa Gástrica/inmunología , Mucosa Gástrica/microbiología , Infecciones por Helicobacter/genética , Infecciones por Helicobacter/inmunología , Infecciones por Helicobacter/microbiología , Helicobacter pylori/fisiología , Humanos , Mediadores de Inflamación/inmunología , Masculino , Ratones , Ratones Endogámicos C57BL
10.
Nanomedicine (Lond) ; 10(1): 57-71, 2015 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-25177920

RESUMEN

AIM: The aim of this work was to develop fucose-conjugated nanoparticles and control the release of berberine, and demonstrate that these particles come into contact with Helicobacter pylori and enhance the suppressive effect of berberine on H. pylori growth. MATERIALS & METHODS: Fucose-chitosan/heparin nanoparticle-encapsulated berberine was prepared and delivery efficiency was monitored by confocal laser scanning microscopy. Anti-H. pylori activities were investigated by determining the calculated bacterial colonies and immunohistochemistry staining analysis. RESULTS: Analysis of a simulated gastrointestinal medium indicated that the proposed drug carrier effectively controls the release of berberine, which interacts specifically at the site of H. pylori infection, and significantly increases berberine's suppressive effect on H. pylori growth. In an in vivo study, the berberine-loaded fucose-conjugated nanoparticles exhibited an H. pylori clearance effect. CONCLUSION: These findings indicate that berberine-loaded fucose-conjugated nanoparticles exert an H. pylori clearance effect and effectively reduce gastric inflammation in an H. pylori-infected animal study.


Asunto(s)
Sistemas de Liberación de Medicamentos , Infecciones por Helicobacter/tratamiento farmacológico , Helicobacter pylori/efectos de los fármacos , Nanopartículas/administración & dosificación , Animales , Berberina/administración & dosificación , Berberina/química , Quitosano/administración & dosificación , Quitosano/química , Fucosa/administración & dosificación , Fucosa/química , Infecciones por Helicobacter/microbiología , Infecciones por Helicobacter/patología , Helicobacter pylori/patogenicidad , Heparina/administración & dosificación , Heparina/química , Humanos , Ratones , Microscopía Confocal , Nanopartículas/química
11.
PLoS One ; 9(8): e105362, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25133542

RESUMEN

Salmonella, a common zoonotic pathogen, causes gastroenteritis in both humans and animals. Traditional Chinese Medicine (TCM) has been used to improve gastrointestinal dysfunction and to modify the immune response to inflammation for centuries. This study used six herbal plants and four TCM formulae to rate their efficacy in preventing S. Typhimurium infection via mouse model. Minimum bactericidal concentration (MBC) of Coptidis rhizome (CR) against the reference strain tallied 12.5 mg/ml and against clinical isolate ST21 was 25 mg/ml. MBCs of other herbal extracts and formulae on Salmonella Typhimurium strains were above 50 mg/ml. In the mice model, CR and Si Jun Zi Tang (SJZT) could significantly decrease the bacterial load in organs and blood after being challenged, along with body weight loss due to the infection. CR and SJZT alleviated infection-induced interferon-gamma levels in the serum and tissues, and tumor necrosis factor-alpha (TNF-α) levels in intestinal tissues. CR and SJZT serum metabolites could suppress S. Typhimurium invasion and TNF-α expression in RAW264.7 cells. The therapeutic activity of CR and SJZT may involve berberine, ginsenoside Rb1, and glycyrrhizin, interfering with Salmonella when invading macrophages. CR and SJZT has shown potential in preventing S. Typhimurium infection through the regulation of the immune response.


Asunto(s)
Antibacterianos/uso terapéutico , Medicamentos Herbarios Chinos/uso terapéutico , Salmonelosis Animal/inmunología , Salmonelosis Animal/prevención & control , Salmonella typhimurium/efectos de los fármacos , Animales , Línea Celular , Coptis chinensis , Inmunidad/efectos de los fármacos , Interferón gamma/inmunología , Macrófagos/efectos de los fármacos , Macrófagos/inmunología , Macrófagos/microbiología , Masculino , Ratones , Ratones Endogámicos BALB C , Salmonella typhimurium/inmunología , Salmonella typhimurium/aislamiento & purificación , Factor de Necrosis Tumoral alfa/inmunología
12.
J Ethnopharmacol ; 155(1): 702-8, 2014 Aug 08.
Artículo en Inglés | MEDLINE | ID: mdl-24945402

RESUMEN

ETHNO-PHARMACOLOGICAL RELEVANCE: Traditional Chinese medicine (TCM) is commonly provided to cancer patients, however, the patterns of prescriptions for this type of medicine in Taiwan are unclear. This study aimed to evaluate the use of traditional Chinese medicine products in colon cancer patients post-surgery in Taiwan and to research patterns of TCM. MATERIAL AND METHODS: This was a cross-sectional study of newly diagnosed colon cancer patients who received surgery between 2004 and 2008 identified from the National Health Insurance Research Database of Taiwan. The prescription patterns and reasons for the use of TCM for colon cancer were analyzed. RESULTS: The results showed that "symptoms, signs and ill-defined conditions" (23.3%) and diseases of the digestive system (16.9%) were the most common reasons for using Chinese herbal medicine. Xiang-sha-liu-jun-zi-tang (7.1%), Bu-zhong-yi-qi-tang (4.3%), Jia-wei-xiao-yao-san (4.1%), Shen-Ling-Bai-Zhu-San (3.7%), Ban-Xia-Xie-Xin-Tang (3.4%), Gui-pi-tang (2.4%), Ping-Wei-San (2.4%), Gan-Lu-Yin (2.0%), Bao-He-Wan (1.9%), and Zhen-Ren-Huo-Ming-Yin (1.8%) were the most commonly prescribed single Chinese herbal formulae (CHF) for colon cancer patients post-surgery. Hedyotis diffusa Willd (Bai Hua She She Cao) (5.1%) and Scutellaria barbata (Ban Zhi Lian )(4.8%) were the most commonly prescribed single Chinese herbs. CONCLUSIONS: This study identified patterns of TCM use in colon cancer patients post-surgery in Taiwan. The herbal ingredients were most commonly used for stimulate ghrelin secretion to increase food intake and had potential anti-tumor effect. However, further research is required to evaluate any beneficial effects which could identify leads for the development of new treatment strategies using TCM.


Asunto(s)
Neoplasias del Colon/tratamiento farmacológico , Medicamentos Herbarios Chinos/uso terapéutico , Medicina Tradicional China/métodos , Pautas de la Práctica en Medicina/estadística & datos numéricos , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Niño , Preescolar , Neoplasias del Colon/cirugía , Estudios Transversales , Bases de Datos Factuales , Femenino , Humanos , Masculino , Persona de Mediana Edad , Taiwán , Adulto Joven
13.
Artículo en Inglés | MEDLINE | ID: mdl-23533497

RESUMEN

Salmonella enterica serovar Choleraesuis, a host-adapted pathogen of swine, usually causes septicemia. Lactic acid bacteria (LAB) strains have been widely studied in recent years for their probiotic properties. In this study, a mouse infection model first screened for potential agents against infection, then a pig infection model evaluated effects of LAB strains and herbal plants against infection. Scutellariae radix (SR) and Gardeniae fructus (GF) showed abilities to reduce bacteria shedding and suppressing serum level of TNF- α induced by infection in swine. Bioactivities of SR and GF were enhanced by combining with LAB strains, which alone could speed up the bacteria elimination time in feces and boost immunity of infected pigs. Baicalein and genipin exhibited stronger cytotoxicity than baicalin and geniposide did, as well as prevent Salmonella from invading macrophages. Our study suggests LAB strains as exhibiting multiple functions: preventing infection, enhancing immunity to prepare host defenses against further infection, and adjusting intestinal microbes' enzymatic activity in order to convert herbal compounds to active compounds. The SR/GF-LAB strain mixture holds potential infection-prevention agents supplied as feed additives.

14.
Acta Biomater ; 7(2): 593-603, 2011 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-20813208

RESUMEN

Various approaches have been proposed to overcome the unpleasant side-effects associated with antibiotic treatment for Helicobacter pylori. The limited effectiveness of such approaches has forced researchers to consider alternative strategies to eliminate H. pylori infection. The plant alkaloid berberine is known to significantly reduce proliferation of H. pylori. To localize berberine to the site of H. pylori infection, this study developed a novel nanoparticle berberine carrier with a heparin shell. Analysis of a simulated gastrointestinal medium indicated that the proposed in vitro drug carrier system effectively controlled the release of berberine, which interacted specifically with the intercellular space at the site of H. pylori infection. Furthermore, the prepared nanoparticles significantly increased the suppressive effect of berberine on H. pylori growth while efficiently reducing cytotoxic effects in H. pylori-infected cells.


Asunto(s)
Berberina/farmacología , Sistemas de Liberación de Medicamentos , Helicobacter pylori/efectos de los fármacos , Heparina/farmacología , Nanopartículas/química , Línea Celular , Supervivencia Celular/efectos de los fármacos , Quitosano/farmacología , Cromatografía Líquida de Alta Presión , Fluorescencia , Helicobacter pylori/citología , Helicobacter pylori/crecimiento & desarrollo , Humanos , Concentración de Iones de Hidrógeno/efectos de los fármacos , Pruebas de Sensibilidad Microbiana , Microscopía Confocal , Nanopartículas/ultraestructura , Tamaño de la Partícula , Soluciones , Espectrometría de Masa por Ionización de Electrospray , Espectroscopía Infrarroja por Transformada de Fourier , Electricidad Estática
15.
Biomacromolecules ; 11(1): 133-42, 2010 Jan 11.
Artículo en Inglés | MEDLINE | ID: mdl-19924885

RESUMEN

A variety of approaches have been studied to overcome the problems encountered with using antibiotics, which are ineffective in treating Helicobacter pylori infections. In our study, chitosan/poly-gamma-glutamic acid nanoparticles incorporated into pH-sensitive hydrogels were developed as an efficient carrier for amoxicillin delivery. Our results indicate that hydrogels are pH-sensitive, leading to protecting nanoparticles from being destructed by gastric acid. The results of drug releasing in vitro study clearly indicate that the amount of amoxicillin released from nanoparticles incorporated in hydrogels at pH 1.2 was relatively low (14%), compared to that from only nanoparticles (50%). Confocal laser scanning microscopy revealed that nanoparticles could infiltrate cell-cell junctions and interact with H. pylori infection sites in the intercellular spaces. Additionally, the incorporation of amoxicillin-loaded nanoparticles in a hydrogel protected the drug from the actions of the gastric juice and facilitated amoxicillin interaction specifically with intercellular spaces, the site of H. pylori infection.


Asunto(s)
Amoxicilina/farmacología , Antibacterianos/farmacología , Infecciones por Helicobacter/tratamiento farmacológico , Helicobacter pylori/efectos de los fármacos , Hidrogeles/farmacología , Nanopartículas , Adenocarcinoma/tratamiento farmacológico , Adenocarcinoma/microbiología , Amoxicilina/administración & dosificación , Animales , Antibacterianos/administración & dosificación , Quitosano/química , Quitosano/farmacología , Portadores de Fármacos , Sistemas de Liberación de Medicamentos , Jugo Gástrico/efectos de los fármacos , Jugo Gástrico/metabolismo , Infecciones por Helicobacter/microbiología , Hidrogeles/administración & dosificación , Concentración de Iones de Hidrógeno , Neoplasias Gástricas/tratamiento farmacológico , Neoplasias Gástricas/microbiología , Células Tumorales Cultivadas
16.
Biomaterials ; 30(19): 3332-42, 2009 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-19299008

RESUMEN

The microorganism now known as Helicobacter pylori is considered to be an important factor in the etiology of peptic ulcers. It can secrete urease enzyme and buffer gastric acids to survive in the stomach. H. pylori can colonize the gastric mucosa and preferentially adheres near the cell-cell junctions of the gastric mucous cells. In this study, pH-responsive nanoparticles were produced instantaneously upon the addition of heparin solution to a chitosan solution with magnetic stirring at room temperature. The nanoparticles appeared to have a particle size of 130-300 nm, with a positive surface charge, and were stable at pH 1.2-2.5, allowing them to protect an incorporated drug from destructive gastric acids. We also demonstrated that the prepared nanoparticles can adhere to and infiltrate cell-cell junctions and interact locally with H. pylori infection sites in intercellular spaces.


Asunto(s)
Quitosano , Mucosa Gástrica/microbiología , Infecciones por Helicobacter/tratamiento farmacológico , Helicobacter pylori/fisiología , Heparina , Nanopartículas , Animales , Materiales Biocompatibles/química , Materiales Biocompatibles/uso terapéutico , Células Cultivadas , Quitosano/química , Quitosano/uso terapéutico , Técnicas de Cocultivo , Colorantes Fluorescentes/metabolismo , Mucosa Gástrica/citología , Heparina/química , Heparina/uso terapéutico , Humanos , Concentración de Iones de Hidrógeno , Masculino , Ensayo de Materiales , Ratones , Ratones Endogámicos BALB C , Estructura Molecular , Nanopartículas/química , Nanopartículas/uso terapéutico
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