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1.
Cell ; 185(15): 2644-2648, 2022 07 21.
Artículo en Inglés | MEDLINE | ID: mdl-35868270

RESUMEN

Bioprinting merges additive manufacturing and tissue engineering to generate functional tissues and organs. The field has experienced tremendous growth over the past few years. Here, we highlight recent breakthroughs in bioprinting and discuss the challenges that are yet to be addressed before this technology can be widely utilized in biology and medicine.


Asunto(s)
Bioimpresión , Biología , Impresión Tridimensional , Medicina Regenerativa , Ingeniería de Tejidos
2.
Small ; 19(16): e2205320, 2023 04.
Artículo en Inglés | MEDLINE | ID: mdl-36720798

RESUMEN

Capturing rare disease-associated biomarkers from body fluids can offer an early-stage diagnosis of different cancers. Circulating tumor cells (CTCs) are one of the major cancer biomarkers that provide insightful information about the cancer metastasis prognosis and disease progression. The most common clinical solutions for quantifying CTCs rely on the immunomagnetic separation of cells in whole blood. Microfluidic systems that perform magnetic particle separation have reported promising outcomes in this context, however, most of them suffer from limited efficiency due to the low magnetic force generated which is insufficient to trap cells in a defined position within microchannels. In this work, a novel method for making soft micromagnet patterns with optimized geometry and magnetic material is introduced. This technology is integrated into a bilayer microfluidic chip to localize an external magnetic field, consequently enhancing the capture efficiency (CE) of cancer cells labeled with the magnetic nano/hybrid microgels that are developed in the previous work. A combined numerical-experimental strategy is implemented to design the microfluidic device and optimize the capturing efficiency and to maximize the throughput. The proposed design enables high CE and purity of target cells and real-time time on-chip monitoring of their behavior. The strategy introduced in this paper offers a simple and low-cost yet robust opportunity for early-stage diagnosis and monitoring of cancer-associated biomarkers.


Asunto(s)
Técnicas Analíticas Microfluídicas , Microgeles , Células Neoplásicas Circulantes , Humanos , Separación Celular/métodos , Microfluídica , Separación Inmunomagnética/métodos , Células Neoplásicas Circulantes/patología , Línea Celular Tumoral , Fenómenos Magnéticos , Técnicas Analíticas Microfluídicas/métodos
3.
Small ; 17(44): e2103192, 2021 11.
Artículo en Inglés | MEDLINE | ID: mdl-34558181

RESUMEN

An effective treatment of human diseases using regenerative medicine and cell therapy approaches requires a large number of cells. Cultivation of cells on microcarriers is a promising approach due to the high surface-to-volume ratios that these microcarriers offer. Here, multifunctional temperature-responsive microcarriers (cytoGel) made of an interpenetrating hydrogel network composed of poly(N-isopropylacrylamide) (PNIPAM), poly(ethylene glycol) diacrylate (PEGDA), and gelatin methacryloyl (GelMA) are developed. A flow-focusing microfluidic chip is used to produce microcarriers with diameters in the range of 100-300 µm and uniform size distribution (polydispersity index of ≈0.08). The mechanical properties and cells adhesion properties of cytoGel are adjusted by changing the composition hydrogel composition. Notably, GelMA regulates the temperature response and enhances microcarrier stiffness. Human-derived glioma cells (U87) are grown on cytoGel in static and dynamic culture conditions with cell viabilities greater than 90%. Enzyme-free cell detachment is achieved at room temperature with up to 70% detachment efficiency. Controlled release of bioactive molecules from cytoGel is accomplished for over a week to showcase the potential use of microcarriers for localized delivery of growth factors to cell surfaces. These microcarriers hold great promise for the efficient expansion of cells for the industrial-scale culture of therapeutic cells.


Asunto(s)
Técnicas de Cultivo de Célula , Gelatina , Adhesión Celular , Proliferación Celular , Humanos , Metacrilatos
4.
Int J Mol Sci ; 22(22)2021 Nov 10.
Artículo en Inglés | MEDLINE | ID: mdl-34830041

RESUMEN

Chemoattraction is a normal and essential process, but it can also be involved in tumorigenesis. This phenomenon plays a key role in glioblastoma (GBM). The GBM tumor cells are extremely difficult to eradicate, due to their strong capacity to migrate into the brain parenchyma. Consequently, a complete resection of the tumor is rarely a possibility, and recurrence is inevitable. To overcome this problem, we proposed to exploit this behavior by using three chemoattractants: CXCL10, CCL2 and CCL11, released by a biodegradable hydrogel (GlioGel) to produce a migration of tumor cells toward a therapeutic trap. To investigate this hypothesis, the agarose drop assay was used to test the chemoattraction capacity of these three chemokines on murine F98 and human U87MG cell lines. We then studied the potency of this approach in vivo in the well-established syngeneic F98-Fischer glioma-bearing rat model using GlioGel containing different mixtures of the chemoattractants. In vitro assays resulted in an invasive cell rate 2-fold higher when chemokines were present in the environment. In vivo experiments demonstrated the capacity of these specific chemoattractants to strongly attract neoplastic glioblastoma cells. The use of this strong locomotion ability to our end is a promising avenue in the establishment of a new therapeutic approach in the treatment of primary brain tumors.


Asunto(s)
Neoplasias Encefálicas , Quimiocina CCL11/metabolismo , Quimiocina CCL2/metabolismo , Quimiocina CXCL10/metabolismo , Glioblastoma , Proteínas de Neoplasias/metabolismo , Neuroglía , Animales , Neoplasias Encefálicas/metabolismo , Neoplasias Encefálicas/patología , Neoplasias Encefálicas/terapia , Línea Celular Tumoral , Glioblastoma/metabolismo , Glioblastoma/patología , Glioblastoma/terapia , Humanos , Masculino , Ratones , Neuroglía/metabolismo , Neuroglía/patología , Ratas , Ratas Endogámicas F344
5.
Int J Mol Sci ; 22(13)2021 Jun 28.
Artículo en Inglés | MEDLINE | ID: mdl-34203268

RESUMEN

Viral-associated respiratory infectious diseases are one of the most prominent subsets of respiratory failures, known as viral respiratory infections (VRI). VRIs are proceeded by an infection caused by viruses infecting the respiratory system. For the past 100 years, viral associated respiratory epidemics have been the most common cause of infectious disease worldwide. Due to several drawbacks of the current anti-viral treatments, such as drug resistance generation and non-targeting of viral proteins, the development of novel nanotherapeutic or nano-vaccine strategies can be considered essential. Due to their specific physical and biological properties, nanoparticles hold promising opportunities for both anti-viral treatments and vaccines against viral infections. Besides the specific physiological properties of the respiratory system, there is a significant demand for utilizing nano-designs in the production of vaccines or antiviral agents for airway-localized administration. SARS-CoV-2, as an immediate example of respiratory viruses, is an enveloped, positive-sense, single-stranded RNA virus belonging to the coronaviridae family. COVID-19 can lead to acute respiratory distress syndrome, similarly to other members of the coronaviridae. Hence, reviewing the current and past emerging nanotechnology-based medications on similar respiratory viral diseases can identify pathways towards generating novel SARS-CoV-2 nanotherapeutics and/or nano-vaccines.


Asunto(s)
Antivirales/química , Portadores de Fármacos/química , Nanomedicina , Infecciones del Sistema Respiratorio/patología , Vacunas Virales/química , Virosis/patología , Antivirales/uso terapéutico , COVID-19/inmunología , COVID-19/patología , COVID-19/terapia , COVID-19/virología , Humanos , Sistema Inmunológico/metabolismo , Infecciones del Sistema Respiratorio/terapia , Infecciones del Sistema Respiratorio/virología , SARS-CoV-2/aislamiento & purificación , Vacunas Virales/administración & dosificación , Vacunas Virales/inmunología , Virosis/inmunología , Virosis/prevención & control , Virosis/terapia
6.
Int J Mol Sci ; 21(9)2020 Apr 30.
Artículo en Inglés | MEDLINE | ID: mdl-32365781

RESUMEN

Glioblastoma multiforme (GBM) is a rapidly progressive and deadly form of brain tumor with a median survival rate of ~15 months. GBMs are hard to treat and significantly affect the patient's physical and cognitive abilities and quality of life. Temozolomide (TMZ)-an alkylating agent that causes DNA damage-is the only chemotherapy choice for the treatment of GBM. However, TMZ also induces autophagy and causes tumor cell resistance and thus fails to improve the survival rate among patients. Here, we studied the drug-induced programmed cell death and invasion inhibition capacity of TMZ and a mevalonate cascade inhibitor, simvastatin (Simva), in a three-dimensional (3D) microfluidic model of GBM. We elucidate the role of autophagy in apoptotic cell death by comparing apoptosis in autophagy knockdown cells (Atg7 KD) against their scrambled counterparts. Our results show that the cells were significantly less sensitive to drugs in the 3D model as compared to monolayer culture systems. An immunofluorescence analysis confirmed that apoptosis is the mechanism of cell death in TMZ- and Simva-treated glioma cells. However, the induction of apoptosis in the 3D model is significantly lower than in monolayer cultures. We have also shown that autophagy inhibition (Atg7 KD) did not change TMZ and Simva-induced apoptosis in the 3D microfluidic model. Overall, for the first time in this study we have established the simultaneous detection of drug induced apoptosis and autophagy in a 3D microfluidic model of GBM. Our study presents a potential ex vivo platform for developing novel therapeutic strategies tailored toward disrupting key molecular pathways involved in programmed cell death and tumor invasion in glioblastoma.


Asunto(s)
Apoptosis , Movimiento Celular , Microfluídica , Antineoplásicos/farmacología , Apoptosis/efectos de los fármacos , Apoptosis/genética , Autofagia , Línea Celular Tumoral , Movimiento Celular/efectos de los fármacos , Movimiento Celular/genética , Células Cultivadas , Glioblastoma , Humanos , Dispositivos Laboratorio en un Chip , Técnicas Analíticas Microfluídicas , Microfluídica/métodos , Esferoides Celulares
7.
Biotechnol Lett ; 39(9): 1279-1290, 2017 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-28550360

RESUMEN

There is a great need for the development of biomimetic human tissue models that allow elucidation of the pathophysiological conditions involved in disease initiation and progression. Conventional two-dimensional (2D) in vitro assays and animal models have been unable to fully recapitulate the critical characteristics of human physiology. Alternatively, three-dimensional (3D) tissue models are often developed in a low-throughput manner and lack crucial native-like architecture. The recent emergence of bioprinting technologies has enabled creating 3D tissue models that address the critical challenges of conventional in vitro assays through the development of custom bioinks and patient derived cells coupled with well-defined arrangements of biomaterials. Here, we provide an overview on the technological aspects of 3D bioprinting technique and discuss how the development of bioprinted tissue models have propelled our understanding of diseases' characteristics (i.e. initiation and progression). The future perspectives on the use of bioprinted 3D tissue models for drug discovery application are also highlighted.


Asunto(s)
Bioimpresión/métodos , Modelos Biológicos , Impresión Tridimensional , Humanos
8.
Small ; 12(27): 3677-89, 2016 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-27254107

RESUMEN

Biomaterials currently used in cardiac tissue engineering have certain limitations, such as lack of electrical conductivity and appropriate mechanical properties, which are two parameters playing a key role in regulating cardiac cell behavior. Here, the myocardial tissue constructs are engineered based on reduced graphene oxide (rGO)-incorporated gelatin methacryloyl (GelMA) hybrid hydrogels. The incorporation of rGO into the GelMA matrix significantly enhances the electrical conductivity and mechanical properties of the material. Moreover, cells cultured on composite rGO-GelMA scaffolds exhibit better biological activities such as cell viability, proliferation, and maturation compared to ones cultured on GelMA hydrogels. Cardiomyocytes show stronger contractility and faster spontaneous beating rate on rGO-GelMA hydrogel sheets compared to those on pristine GelMA hydrogels, as well as GO-GelMA hydrogel sheets with similar mechanical property and particle concentration. Our strategy of integrating rGO within a biocompatible hydrogel is expected to be broadly applicable for future biomaterial designs to improve tissue engineering outcomes. The engineered cardiac tissue constructs using rGO incorporated hybrid hydrogels can potentially provide high-fidelity tissue models for drug studies and the investigations of cardiac tissue development and/or disease processes in vitro.


Asunto(s)
Grafito/química , Hidrogeles/química , Ingeniería de Tejidos/métodos , Andamios del Tejido/química , Materiales Biocompatibles/química , Gelatina/química , Microscopía Electrónica de Transmisión
9.
Int J Biometeorol ; 60(6): 867-71, 2016 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-26471188

RESUMEN

A study was conducted using 144 laying hens to evaluate the effects of adding aqueous extract of Tribulus terrestris to diets on productive performance, egg quality traits, and some blood parameters of laying hens reared under cold stress condition (6.8 ± 3 °C). The birds were randomly assigned to each of four dietary treatments (C, T1, T2, and T3) with six replicate cages of six birds. Diet inclusion of aqueous extract of T. terrestris at the rate of 10, 20, and 30 ml/Lit offered to groups T1, T2, and T3, respectively, while group C served as the control diet with no addition. Feed intake (FI), feed conversion ratio (FCR), egg weight (EW), egg production (EP), and egg mass (EM) were evaluated during the 42-day trial period. The EP and EM increased, whereas FCR decreased (P < 0.001) in the hens fed the extract-included diet as compared to those fed the basal diet. The serum content of cholesterol decreased and the thickness of egg shell increased in the hens fed the T2 and T3 diet compared to those fed the basal diet. Overall from the results of the present experiment, it can be concluded that diet supplementation with aqueous extract of T. terrestris has beneficial effects on productive performance of laying hens reared under cold stress condition.


Asunto(s)
Pollos , Frío/efectos adversos , Suplementos Dietéticos , Extractos Vegetales/farmacología , Tribulus , Alimentación Animal , Animales , Pollos/sangre , Pollos/fisiología , Colesterol/sangre , Huevos/análisis , Femenino , Hojas de la Planta , Estrés Fisiológico
10.
Int J Biometeorol ; 60(3): 447-54, 2016 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-26238513

RESUMEN

This study was conducted to evaluate the effects of adding peppermint essential oil (PEO), thyme essential oil (TEO), or their combination to diet on productive performance, egg quality traits, and blood parameters of laying hens reared under cold stress condition (6.8 ± 3 °C). Feed intake (FI), feed conversion ratio (FCR), egg weight (EW), egg production (EP), and egg mass (EM) were evaluated during the 56-day trial period using 120 Lohmann LSL-lite laying hens. Significant interactions between PEO and TEO on FCR, EP, and EM were observed (P < 0.05). The EP and EM increased, whereas FCR decreased (P < 0.05) in the hens fed the diets supplemented by the combined form of PEO and TEO compared to those fed the basal diet. Also, increased EW and FI were observed in the laying hens fed the diet added by PEO compared to the birds fed the basal diet. There were significant interactions between PEO and TEO on the serum level of cholesterol, shell thickness, and Hough unit of egg (P < 0.05), so that serum content of cholesterol decreased, but egg shell thickness and Hough unit increased in the hens fed the diet supplemented by the combined form of PEO and TEO compared to those fed the basal diet. From the results of the present experiment, it can be concluded that diet supplementation by combined form of PEO and TEO could have beneficial effects on performance parameters of hens reared under cold stress condition.


Asunto(s)
Pollos , Respuesta al Choque por Frío/fisiología , Huevos , Mentha piperita , Aceites Volátiles/farmacología , Thymus (Planta) , Alimentación Animal , Animales , Glucemia/análisis , Pollos/sangre , Pollos/fisiología , Colesterol/sangre , Frío/efectos adversos , Ingestión de Alimentos , Femenino , Albúmina Sérica/análisis , Triglicéridos/sangre , Ácido Úrico/sangre
11.
Int J Biometeorol ; 60(5): 757-62, 2016 May.
Artículo en Inglés | MEDLINE | ID: mdl-26431701

RESUMEN

This study was conducted to investigate the effect of different supplementation levels of Chlorella microalgae on serum metabolites and the plasma content of minerals in laying hens reared under heat stress condition (27.5-36.7 °C, variable). A total number of 378 (40 weeks of age, with mean body weight of 1390 ± 120 g) were randomly allocated to six treatments with seven replicates. The birds were randomly assigned to 6 treatments (C, T1, T2, T3, T4, and T5) with 7 replicate cages of 9 birds. C. microalgae at the rates of 100, 200, 300, 400, and 500 ppm with water were offered to groups T1, T2, T3, T4, and T5, respectively, while group C served as a control. At 71 days of trial, blood samples (14 samples per treatment) were taken for measuring serum metabolites and at 72 days for plasma mineral analysis. The results of this experiment showed that the supplementation of 200-500 ppm C. microalgae decreased the serum content of cholesterol, triglycerides, and LDL (P < 0.05) whereas HDL content increased (P < 0.05) in the hens supplemented with C. microalgae (300 or 400 and 500 ppm). C. microalgae at rates of 300-500 ppm caused a marked (P < 0.05) increase in the plasma content of manganese or iodine and selenium but other minerals were not statistically different among treatments. Overall, from the results of the present experiment, it can be concluded that supplementation of C. microalgae at high rates was beneficial on blood parameters of laying hens reared under heat stress.


Asunto(s)
Alimentación Animal , Pollos/sangre , Chlorella , Trastornos de Estrés por Calor/sangre , Trastornos de Estrés por Calor/veterinaria , Microalgas , Animales , Suplementos Dietéticos , Femenino , Trastornos de Estrés por Calor/prevención & control , Yodo/sangre , Lípidos/sangre , Manganeso/sangre , Selenio/sangre
12.
Int J Biometeorol ; 59(9): 1169-77, 2015 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-25376631

RESUMEN

This study was conducted to evaluate the effects of adding zinc (Zn), cinnamon essential oil (Ci), or their combination in diet on productive performance, egg quality, and blood parameters of laying hens reared under cold stress condition (8.8 ± 3 °C). Feed intake (FI), feed conversion ratio (FCR), egg weight (EW), egg production (EP), and egg mass (EM) were evaluated during the 56-day trial period using 120 Lohmann LSL-Lite laying hens. Significant interactions between Ci and Zn on FCR, EW, EP, or EM were observed (P < 0.05). The EP, EM, and EW increased, whereas FCR decreased (P < 0.05) in the hens fed the diets including Ci and Zn (as single or combined form) compared to those fed the basal diet. There were significant interactions between Ci and Zn on the serum level of glucose and triglycerides as well as plasma concentration of zinc (P < 0.05), so that serum content of glucose and triglyceride decreased and the plasma content of zinc increased in the hens fed the diets including Ci and Zn (together) compared to those fed the basal diet. From the results of the present experiment, it can be concluded that diet supplementation by the combined form of Ci and Zn could have beneficial effects on performance and blood parameters of hens reared under cold stress condition.


Asunto(s)
Pollos , Cinnamomum zeylanicum , Respuesta al Choque por Frío/efectos de los fármacos , Suplementos Dietéticos , Aceites Volátiles/farmacología , Zinc/farmacología , Alimentación Animal , Animales , Glucemia/análisis , Peso Corporal/efectos de los fármacos , Pollos/sangre , Pollos/fisiología , Frío/efectos adversos , Respuesta al Choque por Frío/fisiología , Ingestión de Alimentos/efectos de los fármacos , Huevos , Femenino , Triglicéridos/análisis , Zinc/sangre , Zinc/farmacocinética
13.
Adv Funct Mater ; 24(26): 4060-4067, 2014 07 09.
Artículo en Inglés | MEDLINE | ID: mdl-25411576

RESUMEN

The fabrication of cell-laden structures with anisotropic mechanical properties while having a precise control over the distribution of different cell types within the constructs is important for many tissue engineering applications. Automated textile technologies for making fabrics allow simultaneous control over the color pattern and directional mechanical properties. The use of textile techniques in tissue engineering, however, demands the presence of cell-laden fibers that can withstand the mechanical stresses during the assembly process. Here, the concept of composite living fibers (CLFs) in which a core of load bearing synthetic polymer is coated by a hydrogel layer containing cells or microparticles is introduced. The core thread is drawn sequentially through reservoirs containing a cell-laden prepolymer and a crosslinking reagent. The thickness of the hydrogel layer increases linearly with to the drawing speed and the prepolymer viscosity. CLFs are fabricated and assembled using regular textile processes including weaving, knitting, braiding, winding, and embroidering, to form cell-laden structures. Cellular viability and metabolic activity are preserved during CLF fabrication and assembly, demonstrating the feasibility of using these processes for engineering functional 3D tissue constructs.

14.
Biomed Microdevices ; 16(3): 387-95, 2014 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-24590741

RESUMEN

Cell distribution and nutrient supply in 3D cell-laden hydrogel scaffolds are critical and should mimic the in vivo cellular environment, but been difficult to control with conventional fabrication methods. Here, we present a microfluidic direct writer (MFDW) to construct 3D cell-laden hydrogel structures with openings permitting media exchange. The MFDW comprises a monolithic microfluidic head, which delivers coaxial streams of cell-laden sodium alginate and calcium chloride solutions to form hydrogel fibers. Fiber diameter is controlled by adjusting the ratio of the volumetric flow rates. The MFDW head is mounted on a motorized stage, which is automatically controlled and moves at a speed synchronized with the speed of fiber fabrication. Head geometry, flow rates, and viscosity of the writing solutions were optimized to prevent the occurrence of curling and bulging. For continuous use, a highly reliable process is needed, which was accomplished with the integration of a declogging conduit supplying a solvent to dissolve the clogging gel. The MFDW was used for layer-by-layer fabrication of simple 3D structures with encapsulated cells. Assembly of 3D structures with distinct fibers is demonstrated by alternatively delivering two different alginate gel solutions. The MFDW head can be built rapidly and easily, and will allow 3D constructs for tissue engineering to be fabricated with multiple hydrogels and cell types.


Asunto(s)
Técnicas de Cultivo de Célula/instrumentación , Hidrogeles/química , Técnicas Analíticas Microfluídicas/instrumentación , Alginatos/química , Cloruro de Calcio/química , Supervivencia Celular , Ácido Glucurónico/química , Células HEK293 , Ácidos Hexurónicos/química , Humanos
15.
Int J Biometeorol ; 58(6): 1383-91, 2014 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-24096939

RESUMEN

A study was conducted using 240 female day-old broiler chicks to evaluate the effects of dietary chromium picolinate (CrPic), peppermint essential oil (P.mint), or their combination on growth performance and blood biochemical parameters of female broiler chicks raised under heat stress conditions (HS, 23.9 to 38 °C cycling). Average daily gain (ADG), average daily feed intake (ADFI), and feed conversion ratio (FCR) were obtained from 1 to 42 days of age. Furthermore, at the end of the experiment (day 42), birds were bled to determine some blood biochemical parameters and weighed for final body weight (BW). ADFI, ADG, and BW were not influenced significantly by dietary CrPic and P.mint (P>0.05). A significant interaction between dietary CrPic and P.mint on FCR (P=0.012) was detected. FCR significantly decreased in chicks fed the diet including both CrPic and P.mint compared with the CrPic group. Significant interaction between dietary P.mint and CrPic on serum concentrations of triglycerides, glucose, and albumin were observed (P<0.05), but the other measured blood biochemical parameters were not statistically affected by dietary treatments (P>0.05). The serum concentrations of glucose, triglycerides were decreased (P<0.05) in broilers fed the diet including both CrPic and P.mint. Plasma chromium (Cr) content increased significantly (P<0.05) in birds fed the CrPic-included diet compared with the control group (P<0.05). From the results of the present experiment it can be concluded that dietary supplementation with combined P.mint and CrPic could have beneficial effects on some blood biochemical parameters of female chicks reared under heat stress conditions.


Asunto(s)
Pollos , Trastornos de Estrés por Calor/sangre , Ácidos Picolínicos/farmacología , Aceites de Plantas/farmacología , Alimentación Animal/análisis , Animales , Animales Recién Nacidos , Glucemia/análisis , Pollos/sangre , Pollos/crecimiento & desarrollo , Dieta , Ingestión de Alimentos/efectos de los fármacos , Femenino , Trastornos de Estrés por Calor/fisiopatología , Trastornos de Estrés por Calor/veterinaria , Calor/efectos adversos , Mentha piperita , Ácidos Picolínicos/sangre , Ácidos Picolínicos/farmacocinética , Albúmina Sérica/análisis , Estrés Fisiológico , Triglicéridos/sangre , Aumento de Peso/efectos de los fármacos
16.
ScientificWorldJournal ; 2014: 128195, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25045725

RESUMEN

In diversity combining at the receiver, the output signal-to-noise ratio (SNR) is often maximized by using the maximal ratio combining (MRC) provided that the channel is perfectly estimated at the receiver. However, channel estimation is rarely perfect in practice, which results in deteriorating the system performance. In this paper, an imperialistic competitive algorithm (ICA) is proposed and compared with two other evolutionary based algorithms, namely, particle swarm optimization (PSO) and genetic algorithm (GA), for diversity combining of signals travelling across the imperfect channels. The proposed algorithm adjusts the combiner weights of the received signal components in such a way that maximizes the SNR and minimizes the bit error rate (BER). The results indicate that the proposed method eliminates the need of channel estimation and can outperform the conventional diversity combining methods.


Asunto(s)
Algoritmos , Relación Señal-Ruido , Tecnología Inalámbrica
17.
Cells ; 13(4)2024 Feb 19.
Artículo en Inglés | MEDLINE | ID: mdl-38391976

RESUMEN

Glioblastoma multiforme (GBM) is an aggressive type of brain tumor that has limited treatment options. Current standard therapies, including surgery followed by radiotherapy and chemotherapy, are not very effective due to the rapid progression and recurrence of the tumor. Therefore, there is an urgent need for more effective treatments, such as combination therapy and localized drug delivery systems that can reduce systemic side effects. Recently, a handheld printer was developed that can deliver drugs directly to the tumor site. In this study, the feasibility of using this technology for localized co-delivery of temozolomide (TMZ) and deferiprone (DFP) to treat glioblastoma is showcased. A flexible drug-loaded mesh (GlioMesh) loaded with poly (lactic-co-glycolic acid) (PLGA) microparticles is printed, which shows the sustained release of both drugs for up to a month. The effectiveness of the printed drug-eluting mesh in terms of tumor toxicity and invasion inhibition is evaluated using a 3D micro-physiological system on a plate and the formation of GBM tumoroids within the microenvironment. The proposed in vitro model can identify the effective combination doses of TMZ and DFP in a sustained drug delivery platform. Additionally, our approach shows promise in GB therapy by enabling localized delivery of multiple drugs, preventing off-target cytotoxic effects.


Asunto(s)
Glioblastoma , Humanos , Glioblastoma/tratamiento farmacológico , Glioblastoma/patología , Hidrogeles/uso terapéutico , Liberación de Fármacos , Temozolomida/uso terapéutico , Impresión Tridimensional , Microambiente Tumoral
18.
Adv Healthc Mater ; : e2400881, 2024 May 23.
Artículo en Inglés | MEDLINE | ID: mdl-38781005

RESUMEN

Remote health monitoring and treatment serve as critical drivers for advancing health equity, bridging geographical and socioeconomic disparities, ensuring equitable access to quality healthcare for those in underserved or remote regions. By democratizing healthcare, this approach offers timely interventions, continuous monitoring, and personalized care independent of one's location or socioeconomic status, thereby striving for an equitable distribution of health resources and outcomes. Meanwhile, microneedle arrays (MNAs), revolutionize painless and minimally invasive access to interstitial fluid for drug delivery and diagnostics. This paper introduces an integrated theranostic MNA system employing an array of colorimetric sensors to quantitatively measure -pH, glucose, and lactate, alongside a remotely-triggered system enabling on-demand drug delivery. Integration of an ultrasonic atomizer streamlines the drug delivery, facilitating rapid, pumpless, and point-of-care drug delivery, enhancing system portability while reducing complexities. An accompanying smartphone application interfaces the sensing and drug delivery components. Demonstrated capabilities include detecting pH (3 to 8), glucose (up to 16 mm), and lactate (up to 1.6 mm), showcasing on-demand drug delivery, and assessing delivery system performance via a scratch assay. This innovative approach confronts drug delivery challenges, particularly in managing chronic diseases requiring long-term treatment, while also offering avenues for non-invasive health monitoring through microneedle-based sensors.

19.
ACS Appl Bio Mater ; 7(7): 4293-4306, 2024 Jul 15.
Artículo en Inglés | MEDLINE | ID: mdl-38917363

RESUMEN

The present work aims to develop optimized scaffolds for bone repair by incorporating mesoporous nanoparticles into them, thereby combining bioactive factors for cell growth and preventing rapid release or loss of effectiveness. We synthesized biocompatible and biodegradable scaffolds designed for the controlled codelivery of curcumin (CUR) and recombinant human bone morphogenic protein-2 (rhBMP-2). Active agents in dendritic silica/titania mesoporous nanoparticles (DSTNs) were incorporated at different weight percentages (0, 2, 5, 7, 9, and 10 wt %) into a matrix of polycaprolactone (PCL) and polyethylene glycol (PEG) nanofibers, forming the CUR-BMP-2@DSTNs/PCL-PEG delivery system (S0, S2, S5, S7, S9, and S10, respectively, with the number showing the weight percentage). To enhance the formation process, the system was treated using low-intensity pulsed ultrasound (LIPUS). Different advanced methods were employed to assess the physical, chemical, and mechanical characteristics of the fabricated scaffolds, all confirming that incorporating the nanoparticles improves their mechanical and structural properties. Their hydrophilicity increased by approximately 25%, leading to ca. 53% enhancement in their water absorption capacity. Furthermore, we observed a sustained release of approximately 97% for CUR and 70% for BMP-2 for the S7 (scaffold with 7 wt % DSTNs) over 28 days, which was further enhanced using ultrasound. In vitro studies demonstrated accelerated scaffold biodegradation, with the highest level observed in S7 scaffolds, approximately three times higher than the control group. Moreover, the cell viability and proliferation on DSTNs-containing scaffolds increased when compared to the control group. Overall, our study presents a promising nanocomposite scaffold design with notable improvements in structural, mechanical, and biological properties compared to the control group, along with controlled and sustained drug release capabilities. This makes the scaffold a compelling candidate for advanced bone tissue engineering and regenerative therapies.


Asunto(s)
Materiales Biocompatibles , Proteína Morfogenética Ósea 2 , Ensayo de Materiales , Nanofibras , Osteogénesis , Tamaño de la Partícula , Osteogénesis/efectos de los fármacos , Nanofibras/química , Proteína Morfogenética Ósea 2/química , Humanos , Materiales Biocompatibles/química , Materiales Biocompatibles/farmacología , Ondas Ultrasónicas , Curcumina/química , Curcumina/farmacología , Proliferación Celular/efectos de los fármacos , Proteínas Recombinantes/química , Proteínas Recombinantes/farmacología , Proteínas Recombinantes/administración & dosificación , Supervivencia Celular/efectos de los fármacos , Poliésteres/química , Polímeros/química , Andamios del Tejido/química , Polietilenglicoles/química , Factor de Crecimiento Transformador beta
20.
Exp Gerontol ; 192: 112459, 2024 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-38740315

RESUMEN

Sorghum is a promising treatment for Alzheimer's disease (AD), due to its rich antioxidant and anti-inflammatory qualities. Fermentation may also affect nutritional values. Therefore, the purpose of this study was to discover the phenolic and flavonoid chemicals found in both fermented and non-fermented red sorghum, as well as their potential therapeutic uses for AD. L. fermentum, and L. reuteri, and/or L. plantarum and L. casei were used to ferment samples of sorghum. The rats were grouped into five groups, healthy animals, and rats with Alzheimer's receiving 200 mg/kg of saline, non-fermented sorghum, and fermented sorghum fermented with L. fermentum and L. reuteri, as well as L. plantarum and L. casei. Various assessments were conducted, including evaluations of behavioral responses, antioxidant responses, inflammatory responses, acetylcholine levels and acetylcholine esterase, and bacterial populations in stool. P-hydroxybenzoic acid, eriodictyo naringenin, and apigenin were significantly higher in fermented samples, while glycerols were higher in non-fermented samples. The induction of Alzheimer's led to decrease step-through latency, time in target zone, FRAP, acetylcholine levels, Bifidobacterium population and lactobacillus population, while increased escape latency, platform location latency, MDA levels, IL-6, TNF-α, acetylcholine esterase, and coliform population (P = 0.001). The administration of both non-fermented sorghum and fermented sorghum demonstrated the potential to reverse the effects of AD, with a notably higher efficacy observed in the fermented samples compared to the non-fermented ones. In conclusion, fermentation exerted significant effects on the bioactive compounds the administration of fermented sorghum resulted in improved behavioral responses, characterized by a reduction in oxidation, inflammation and microbial population.


Asunto(s)
Enfermedad de Alzheimer , Antioxidantes , Fermentación , Sorghum , Enfermedad de Alzheimer/microbiología , Enfermedad de Alzheimer/metabolismo , Animales , Masculino , Ratas , Ratas Wistar , Flavanonas , Microbioma Gastrointestinal , Modelos Animales de Enfermedad , Flavonoides , Apigenina/farmacología , Fenoles , Acetilcolina/metabolismo , Acetilcolinesterasa/metabolismo , Antiinflamatorios/farmacología , Lactobacillus , Extractos Vegetales/farmacología , Heces/microbiología , Heces/química
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