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2.
Int J Biol Macromol ; : 135729, 2024 Sep 16.
Artículo en Inglés | MEDLINE | ID: mdl-39293615

RESUMEN

A novel hybrid hydrogel bead (HHBFe) composed of polyvinyl alcohol/sodium alginate/gelatin/quaternary ammonium chitosan (PVA/GA/SA/QCS) and Fe3O4 magnetic nanoparticles was synthesized through green cross-linking of Ca2+ and tannic acid (TA) combined freeze-thaw method. HHBFe exhibited a good spherical shape, porosity, magnetic properties, and excellent mechanical properties and durability. The adsorption capacity of HHB and HHBFe towards methyl orange (MO), tetracycline (Tc), and Cr (VI) was systematically studied and compared. Results revealed similar adsorption capacities for MO and Cr (VI) between HHB and HHBFe, while the presence of Fe3O4 significantly enhanced Tc adsorption, indicating the versatile adsorption functions of HHBFe. Adsorption kinetic followed the pseudo-second-order model, with external diffusion and intra-particle diffusion controlling process. The adsorption data were consistent with the Langmuir isothermal adsorption model, indicating predominantly monolayer adsorption of pollutants by beads. Notably, the beads exhibited easily regenerated, maintaining 60 % of initial adsorption capacity after 5 cycles, particularly for Tc and Cr (VI). The good adsorption performance of HHBFe can be attributed to the strong interaction between their multi-functional groups including phenolic hydroxyl groups, carboxyl groups, amino groups, etc., and pollutant molecules. The multifunctional HHBFe beads prepared in this study and the results obtained with three completely different types of pollutants provide reliability support for their use in different wastewater treatment fields and even in the field of drug carriers.

3.
Artículo en Inglés | MEDLINE | ID: mdl-39185858

RESUMEN

BACKGROUND AND OBJECTIVES: Deep brain stimulation (DBS) is an established neurosurgical treatment of a variety of neurological disorders. DBS is considered a safe and effective neurosurgical procedure; however, surgical complications are inevitable, and clinical outcomes may vary. The aim of this study was to describe DBS complications at a large clinical center in the United States and to investigate the relationship between patients' baseline characteristics, surgical technique, and operative complications. METHODS: We identified all patients who underwent DBS lead implantation at our center between 1st January 2012 and 1st January 2020. We extracted relevant information regarding patient demographics, surgical details, clinical complications, and clinical outcomes from the electronic medical records. RESULTS: A total of 859 leads were implanted in 481 patients (153 men, 328 women). The mean patient age at the time of the surgery was 65 years, with the mean disease duration of 13.3 years. There were no mortalities and 57 readmissions within 30 days (mean = 14.2 days). The most common complications included pneumocephalus (n = 661), edema (n = 78), altered mental state (n = 35), implantable pulse generator discomfort (n = 34), hemorrhage (n = 26), and infection (n = 23). Most notably, the use of general anesthesia, hypertension, heart disease, and depression were associated with significantly longer postoperative stay. High preoperative body mass index was associated with higher rates of surgery-related infections and lead revision/explantation. The intraoperative mean arterial pressure, anesthesia type, and frame apparatus were all important predictors of postoperative pneumocephalus. CONCLUSION: In this report, we described the rates and types of complications associated with DBS surgery at a large neurosurgical center in the United States. The novel insights highlighted in this study present an opportunity to further improve the clinical outcomes and patient selection in DBS surgery.

4.
Rep Pract Oncol Radiother ; 29(3): 309-317, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39144263

RESUMEN

Background: Diffuse intrinsic pontine glioma (DIPG) stands as the predominant type of brainstem glioma. It is characterized by a notably brief median survival period, with the majority of patients experiencing disease progression within six months following radiation therapy. This systematic review and meta-analysis aims to assess the efficacy and safety of hypofractionated radiotherapy (HFRT) compared to conventionally fractionated radiotherapy (CFRT) in DIPG treatment. Materials and methods: A systematic literature search was conducted in four databases, and relevant studies comparing HFRT and CFRT in DIPG were included. Data were extracted and analyzed for overall survival (OS), progression-free survival (PFS), and treatment-related toxicities. Statistical analysis was performed using random-effects models with heterogeneity assessment. Results: Five studies met the inclusion criteria, comprising 518 patients. No significant difference in one-year OS was observed between HFRT and CFRT (29% vs. 22%, p = 0.94). The median OS was similar in both treatment groups (9.7 vs. 9.3 months, p = 0.324). Similarly, no significant difference in one-year PFS was found between HFRT and CFRT (19.8% vs. 16.6%, p = 0.82), with comparable median PFS (9.3 vs. 9.4 months, p = 0.20). In meta-regression analysis, there was no association of chemotherapy (p > 0.05) or radiation biologically effective dose (BED) (p > 0.05) regarding OS or PFS outcomes. There were no significant differences in treatment-related toxicities. Conclusions: HFRT yields one-year OS and PFS rates similar to CFRT in DIPG, with no significant differences in treatment-related toxicities. Chemotherapy and BED did not affect OS or PFS.

5.
Asian J Neurosurg ; 19(3): 472-477, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-39205891

RESUMEN

Augmented reality (AR) is a technological tool that superimposes two-dimensional virtual images onto three-dimensional real-world scenarios through the integration of neuronavigation and a surgical microscope. The aim of this study was to demonstrate our initial experience with AR and to assess its application in oncological neurosurgery. This is a case series with 31 patients who underwent surgery at Santa Casa BH for the treatment of intracranial tumors in the period from March 4, 2022, to July 14, 2023. The application of AR was evaluated in each case through three parameters: whether the virtual images auxiliated in the incision and craniotomy and whether the virtual images aided in intraoperative microsurgery decisions. Of the 31 patients, 5 patients developed new neurological deficits postoperatively. One patient died, with a mortality rate of 3.0%. Complete tumor resection was achieved in 22 patients, and partial resection was achieved in 6 patients. In all patients, AR was used to guide the incision and craniotomy in each case, leading to improved and precise surgical approaches. As intraoperative microsurgery guidance, it proved to be useful in 29 cases. The application of AR seems to enhance surgical safety for both the patient and the surgeon. It allows a more refined immediate operative planning, from head positioning to skin incision and craniotomy. Additionally, it helps decision-making in the intraoperative microsurgery phase with a potentially positive impact on surgical outcomes.

6.
Biomater Adv ; 165: 213999, 2024 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-39213959

RESUMEN

The present study utilizes a combination of sodium alginate (Alg), gellan gum (GG), and sodium carboxymethyl cellulose (CMC) to fabricate a ternary composite hydrogel system to encapsulate and release lactoferrin (LF). Rheological properties as well as extensive microscopy and spectroscopy characterization are performed on these materials demonstrating that the physical properties of the resultant hydrogels, such as particle size, water content, gray value, and shrinkage rate were related to the concentration of Alg. In addition, most of these hydrogels were found to have reticulated shells and inner laminar structures assembled based on hydrogen bonding and electrostatic forces. Furthermore, the encapsulation efficiency of LF in hydrogels ranged from 78.3 ± 0.3 to 83.5 ± 0.2 %. Notably, a small amount of encapsulated LF was released from the hydrogel beads in an acid environment (up to 2.2 ± 0.3 % in 2 h), while a controlled release manner was found to take place in an alkaline environment. This phenomenon indicated the potential of these hydrogels as promising matrices for bioactive compound loading and adsorption. The release mechanism varied from Alg concentration suggesting the tunable and versatile properties of this ternary composite hydrogel system. Our findings identify the potential of Alg-GG-CMC hydrogel as a delivery system suitable for various applications in the food industry.


Asunto(s)
Alginatos , Carboximetilcelulosa de Sodio , Hidrogeles , Lactoferrina , Polisacáridos Bacterianos , Polisacáridos Bacterianos/química , Carboximetilcelulosa de Sodio/química , Alginatos/química , Hidrogeles/química , Concentración de Iones de Hidrógeno , Lactoferrina/química , Lactoferrina/administración & dosificación , Materiales Biocompatibles/química , Reología , Ácido Glucurónico/química , Ácidos Hexurónicos/química , Sistemas de Liberación de Medicamentos/métodos
7.
Med Vet Entomol ; 2024 Aug 13.
Artículo en Inglés | MEDLINE | ID: mdl-39136434

RESUMEN

Several species of the worldwide distributed genus Calliphora Robineau-Desvoidy (Insecta, Diptera, Calliphoridae) are medically important vectors and agents of myiasis. Furthermore, these flies are relevant in forensics because they are found in corpses. Information regarding the taxonomy, bionomics and distribution of Calliphora species endemic to South America, including Calliphora lopesi Mello, is scarce. To expand knowledge on C. lopesi, this study presents descriptions of eggs, larvae, puparia and developmental data at 14, 17, 20, 23 and 26 ± 1°C for the first time. Adult flies were collected from the field and kept in the laboratory to obtain samples for morphological and biological studies. Immatures were examined using light and scanning electron microscopy. To assess the growth rate, 10 specimens from each temperature group were randomly removed from the diet and weighed every 24 h from larval hatching until pupation. The minimum developmental threshold, thermal constant and linear development-rate equations were calculated for each stage. Considering weight gain records and survival rates, the optimum temperature for the development of C. lopesi ranges from 23 to 26°C. A key to third-instar larvae of known Neotropical species of Calliphora was also provided to assist in identification. The information provided in this study should be useful in expanding knowledge about Neotropical Calliphoridae species of forensic importance.


Várias espécies do gênero Calliphora Robineau­Desvoidy (Insecta, Diptera, Calliphoridae), distribuídas mundialmente, são vetores e agentes causadoras de miíases clinicamente importantes. Além disso, tais moscas são relevantes no âmbito forense porque são encontradas em cadáveres. Informações sobre a taxonomia, bionomia e distribuição de espécies de Calliphora endêmicas da América do Sul, incluindo Calliphora lopesi Mello, ainda são escassas. Para ampliar o conhecimento sobre a espécie C. lopesi, este estudo apresenta pela primeira vez as descrições de ovos, larvas e pupários, assim como dados sobre o desenvolvimento de imaturos a 14, 17, 20, 23 e 26 ± 1°C. Moscas adultas foram coletadas no campo e mantidas em laboratório para obtenção de amostras para estudos morfológicos e biológicos. Os imaturos foram examinados utilizando microscopia óptica e eletrônica de varredura. Para avaliar a taxa de crescimento, 10 espécimes de cada grupo de temperatura foram retirados aleatoriamente do substrato em que se alimentavam e pesados a cada 24 horas, desde a eclosão das larvas até a pupariação. O limiar mínimo de desenvolvimento, a constante térmica e as equações lineares da taxa de desenvolvimento foram calculados para cada estágio. Levando em consideração os registros de ganho de peso e taxas de sobrevivência, a temperatura ótima para o desenvolvimento de C. lopesi varia de 23 a 26°C. Uma chave para larvas de terceiro estádio de espécies neotropicais conhecidas de Calliphora também está sendo disponibilizada para auxiliar na identificação. Espera­se que as informações fornecidas neste estudo possam ser úteis para ampliar o conhecimento sobre espécies Neotropicais de Calliphoridae de importância forense.

8.
Neurorehabil Neural Repair ; : 15459683241277194, 2024 Aug 31.
Artículo en Inglés | MEDLINE | ID: mdl-39215643

RESUMEN

BACKGROUND: We previously demonstrated that deep brain stimulation (DBS) of lateral cerebellar nucleus (LCN) can enhance motor recovery and functional reorganization of perilesional cortex in rodent models of stroke or TBI. OBJECTIVE: Considering the treatment-related neuroplasticity observed at the perilesional cortex, we hypothesize that chronic LCN DBS-enhanced motor recovery observed will carry-over even after DBS has been deactivated. METHODS: Here, we directly tested the enduring effects of LCN DBS in male Long Evans rats that underwent controlled cortical impact (CCI) injury targeting sensorimotor cortex opposite their dominant forepaw followed by unilateral implantation of a macroelectrode into the LCN opposite the lesion. Animals were randomized to DBS or sham treatment for 4 weeks during which the motor performance were characterize by behavioral metrics. After 4 weeks, stimulation was turned off, with assessments continuing for an additional 2 weeks. Afterward, all animals were euthanized, and tissue was harvested for further analyses. RESULTS: Treated animals showed significantly greater motor improvement across all behavioral metrics relative to untreated animals during the 4-week treatment, with functional gains persisting across 2-week post-treatment. This motor recovery was associated with the increase in CaMKIIα and BDNF positive cell density across perilesional cortex in treated animals. CONCLUSIONS: LCN DBS enhanced post-TBI motor recovery, the effect of which was persisted up to 2 weeks beyond stimulation offset. Such evidence should be considered in relation to future translational efforts as, unlike typical DBS applications, treatment may only need to be provided until such time as a new function plateau is achieved.

9.
Sci Rep ; 14(1): 17537, 2024 07 30.
Artículo en Inglés | MEDLINE | ID: mdl-39080347

RESUMEN

Animal tuberculosis significantly challenges global health, agriculture, and wildlife conservation efforts. Mycobacterial cultures are resource-intensive, time-consuming, and challenged by heterogeneous populations. In this study, we employed a culture-independent approach, using targeted long-read-based next-generation sequencing (tNGS), to investigate the mycobacterial composition in 60 DNA samples extracted from Mycobacterium bovis infected culture-confirmed African buffalo tissue. We detected mycobacterial DNA in 93.3% of the samples and the sensitivity for detecting Mycobacterium tuberculosis complex (MTBC) was 91.7%, demonstrating a high concordance of our culture-independent tNGS approach with mycobacterial culture results. In five samples, we identified heterogenous mycobacterial populations with various non-tuberculous mycobacteria, including members of the Mycobacterium avium complex (MAC), M. smegmatis, and M. komaniense. The latter Mycobacterium species was described in South Africa from bovine nasal swabs and environmental samples from the Hluhluwe-iMfolozi Park, which was the origin of the buffalo samples in the present study. This finding suggests that exposure to environmental mycobacteria may confound detection of MTBC in wildlife. In conclusion, our approach represents a promising alternative to conventional methods for detecting mycobacterial DNA. This high-throughput technique enables rapid differentiation of heterogeneous mycobacterial populations, which will contribute valuable insights into the epidemiology, pathogenesis, and microbial synergy during mycobacterial infections.


Asunto(s)
Búfalos , Secuenciación de Nucleótidos de Alto Rendimiento , Mycobacterium bovis , Tuberculosis , Animales , Búfalos/microbiología , Mycobacterium bovis/genética , Mycobacterium bovis/aislamiento & purificación , Tuberculosis/microbiología , Tuberculosis/veterinaria , Tuberculosis/diagnóstico , Sudáfrica/epidemiología , ADN Bacteriano/genética , Bovinos , Microbiota/genética
10.
Food Chem ; 457: 140199, 2024 Nov 01.
Artículo en Inglés | MEDLINE | ID: mdl-38955121

RESUMEN

Plant-derived extracellular vesicles (PLEVs), as a type of naturally occurring lipid bilayer membrane structure, represent an emerging delivery vehicle with immense potential due to their ability to encapsulate hydrophobic and hydrophilic compounds, shield them from external environmental stresses, control release, exhibit biocompatibility, and demonstrate biodegradability. This comprehensive review analyzes engineering preparation strategies for natural vesicles, focusing on PLEVs and their purification and surface engineering. Furthermore, it encompasses the latest advancements in utilizing PLEVs to transport active components, serving as a nanotherapeutic system. The prospects and potential development of PLEVs are also discussed. It is anticipated that this work will not only address existing knowledge gaps concerning PLEVs but also provide valuable guidance for researchers in the fields of food science and biomedical studies, stimulating novel breakthroughs in plant-based therapeutic options.


Asunto(s)
Vesículas Extracelulares , Plantas , Vesículas Extracelulares/metabolismo , Vesículas Extracelulares/química , Plantas/química , Plantas/metabolismo , Humanos , Animales
11.
Radiother Oncol ; : 110439, 2024 Jul 18.
Artículo en Inglés | MEDLINE | ID: mdl-39032835

RESUMEN

INTRODUCTION: To evaluate the feasibility, efficacy and safety of stereotactic ablative radiotherapy (SABR) to the primary tumor and lymph nodes in patients with locally advanced non-small cell lung cancer (LA-NSCLC) who are ineligible for or refused concomitant chemoradiation. MATERIALS AND METHODS: In accordance with the PRISMA and MOOSE guidelines, a systematic review with meta-analysis was conducted. The study included reports that assessed the outcomes of SABR treatment in patients with LA-NSCLC. Studies evaluating SBRT as a boost following primary radiotherapy were excluded. The primary outcomes measured were local control (LC) and overall survival (OS). The secondary endpoint was the incidence of severe toxicity (grades 3-5). A meta-regression analysis was performed to explore the relationship between LC, OS, and severe toxicity. The Biologically Effective Dose (BED) was analyzed as a continuous variable. Statistical significance was defined as a p-value < 0.05. RESULTS: A total of seven studies (3 prospective and 4 retrospective studies) involving 268 patients (SBRT to primary and lymph nodes) were included in the analysis. The pooled 1-year LC rate was 80 % (95 % CI: 63-94 %), and the factors significantly associated with LC were BEDGy10 (p = 0.005) and neoadjuvant chemotherapy (p = 0.005). The 1-year and 2-year OS rates were 74 % (95 % CI: 58-90 %) and 55 % (95 % CI: 34-76 %), respectively. Meta-regression analysis indicated a linear relationship between OS and LC, with a 0.7 % increase in OS for each 1 % improvement in LC (p = 0.005). The pooled rate of grade 3 acute toxicity was 5 % (95 % CI: 1-10 %), and the rate of grade 5 toxicity was 1.7 % (95 % CI: 0-3 %). CONCLUSION: Promising results (LC and OS) with limited toxicity (feasibility) using SABR in LA-NSCLC warrant further research, emphasizing the need for larger, well-designed trials for further validation of the approach.

12.
ACS Appl Bio Mater ; 7(8): 5201-5210, 2024 Aug 19.
Artículo en Inglés | MEDLINE | ID: mdl-39077865

RESUMEN

In advancing tissue engineering, we introduce a particle system combining the strength of calcium carbonate with the flexibility of hydrogels enhanced with alkaline phosphatase (ALP) for improved bone regeneration. Our innovation lies in creating large hybrid macrospheroids by bonding mineral nanostructured microparticles loaded with ALP through hydrogel polymerization. These composite macrospheroids address critical challenges in cell seeding, growth, and handling within three-dimensional (3D) environments. We conducted extensive characterization of these particles using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), mechanical property assessment, and fluorescence microscopy. The results demonstrate that the hybrid macrospheroids significantly enhance cell manipulation and growth in three-dimensional structures. Specifically, ALP-loaded macrospheroids showed a marked improvement in osteogenic activity, promoting effective bone tissue regeneration. This study not only showcases a unique approach to overcoming the limitations of traditional hydrogels in tissue engineering but also opens pathways for bone tissue regeneration. Our findings offer a promising tool for cell seeding and growth in 3D structures, potentially revolutionizing practices in tissue engineering and regenerative medicine.


Asunto(s)
Materiales Biocompatibles , Carbonato de Calcio , Hidrogeles , Ensayo de Materiales , Tamaño de la Partícula , Ingeniería de Tejidos , Hidrogeles/química , Materiales Biocompatibles/química , Materiales Biocompatibles/farmacología , Carbonato de Calcio/química , Fosfatasa Alcalina/metabolismo , Animales , Osteogénesis/efectos de los fármacos , Regeneración Ósea/efectos de los fármacos , Humanos , Proliferación Celular/efectos de los fármacos , Ratones
13.
Front Sports Act Living ; 6: 1401206, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39022641

RESUMEN

Background: The purported benefits of online physical activity interventions, in terms of reduced costs, high reach, and easy access, may not be fully realized if participants do not engage with the programs. However, there is a lack of research on modifiable predictors (e.g., beliefs) of engagement with online physical activity interventions. The objective of this brief report was to investigate if self-efficacy to engage at baseline predicted subsequent engagement behavior in an online physical activity intervention at post-baseline. Methods: Data (N = 331) from the 2018 Fun For Wellness effectiveness trial (ClinicalTrials.gov, identifier: NCT03194854) were analyzed in this brief report. Multiple logistic regression was fit in Mplus 8 using maximum-likelihood estimation. Results: There was evidence that self-efficacy to engage beliefs at baseline positively predicted subsequent engagement behavior in the Fun For Wellness intervention at 30 days post-baseline. Conclusions: Some recommendations to increase self-efficacy to engage in future online physical activity intervention studies were provided consistent with self-efficacy theory.

14.
Chem Biodivers ; : e202401247, 2024 Jun 19.
Artículo en Inglés | MEDLINE | ID: mdl-38896778

RESUMEN

As part of our continuous research for the discovery of bioactive compounds against Trypanosoma cruzi and Leishmania infantum, the alkaloid (6aS)-dicentrine (1) was oxidized to afford (6aS,6S)- (2) and (6aS,6R)- (3) dicentrine-N-oxides. Evaluation of the cytotoxicity against NCTC cells indicated that 2 and 3 are non-toxic (CC50>200 µM) whereas 1 demonstrated CC50 of 52.0 µM. Concerning T. cruzi activity against amastigotes, derivatives 2 and 3 exhibited EC50 values of 9.9 µM (SI>20.2) and 27.5 µM (SI>7.3), respectively, but 1 is inactive (EC50>100 µM). Otherwise, when tested against L. infantum amastigotes, 1 and 3 exhibited EC50 values of 10.3 µM (SI=5.0) and 12.7 µM (SI>15.7), respectively, being 2 inactive (EC50>100 µM). Comparing the effects of positive controls benznidazol (EC50=6.5 µM and SI>30.7) and miltefosine (EC50=10.2 µM and SI=15.2), it was observed a selective antiparasitic activity to diastereomers 2 and 3 against T. cruzi and L. infantum. Considering stereochemical aspects, it was suggested that the configuration of the new stereocenter formed after oxidation of 1 played an important role in the bioactivity against amastigotes of both tested parasites.

15.
Neurosurg Focus ; 56(6): E12, 2024 06.
Artículo en Inglés | MEDLINE | ID: mdl-38823042

RESUMEN

OBJECTIVE: The aim of this study was 1) to describe the rate of intrathecal baclofen (ITB)-associated complications at a large tertiary center, and 2) to evaluate the impact of patient-related factors on the likelihood of developing such complications. METHODS: A retrospective single-center study was carried out. A total of 301 eligible patients were included in the analysis. Univariate regression models were used to evaluate the impact of age, sex, diagnosis, ambulation status, modified Ashworth scale score, body mass index, diabetes status, and pain level on the likelihood of developing a device-related infection, pump malfunction, catheter malfunction, and other clinically significant complications. RESULTS: Overall, 27% of patients experienced an ITB-related complication. The most common complications included infection (6%, 18/301), pump malfunction (7.3%, 22/301), and catheter malfunction (14%, 42/301). The univariate analyses revealed that the patient's ambulatory status had a significant impact on the likelihood of developing a catheter-related malfunction. Furthermore, a trend toward significance was identified between patients' preoperative body mass index and device-related infection. Finally, the risk of suffering any ITB-related complications was statistically correlated with the number of years that had passed since the initial pump implantation. CONCLUSIONS: The authors' analysis reveals a previously underrecognized association between ambulatory status at the time of ITB pump implantation and the incidence of catheter-related complications, and confirms the impact of time since surgery on the risk of developing any ITB-related complication. The patient's age, sex, diagnosis, diabetes status, or pain level at baseline were not associated with the risk of complications. Collectively, these insights contribute novel information to the existing literature, providing practical value for physicians in guiding patient selection for ITB therapy.


Asunto(s)
Baclofeno , Bombas de Infusión Implantables , Inyecciones Espinales , Relajantes Musculares Centrales , Humanos , Baclofeno/administración & dosificación , Baclofeno/efectos adversos , Masculino , Femenino , Persona de Mediana Edad , Estudios Retrospectivos , Adulto , Factores de Riesgo , Bombas de Infusión Implantables/efectos adversos , Relajantes Musculares Centrales/administración & dosificación , Relajantes Musculares Centrales/efectos adversos , Inyecciones Espinales/efectos adversos , Anciano , Adulto Joven , Espasticidad Muscular/tratamiento farmacológico , Falla de Equipo/estadística & datos numéricos , Adolescente
16.
Fertil Steril ; 122(3): 514-524, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-38729340

RESUMEN

OBJECTIVE: To discover new variants associated with low ovarian reserve after gonadotoxic treatment among adult female childhood cancer survivors using a genome-wide association study approach. DESIGN: Genome-wide association study. SETTING: Not applicable. PATIENTS: A discovery cohort of adult female childhood cancer survivors from the pan-European PanCareLIFE cohort (n = 743; median age: 25.8 years), excluding those who received bilateral ovarian irradiation, bilateral oophorectomy, central nervous system or total body irradiation, or stem cell transplantation. Replication was attempted in the US-based St. Jude Lifetime Cohort (n = 391; median age: 31.3 years). EXPOSURE: Female childhood cancer survivors are at risk of therapy-related gonadal impairment. Alkylating agents are well-established risk factors, and the interindividual variability in gonadotoxicity may be explained by genetic polymorphisms. Data were collected in real-life conditions, and cyclophosphamide equivalent doses were used to quantify alkylation agent exposure. MAIN OUTCOME MEASURE: Anti-Müllerian hormone (AMH) levels served as a proxy for ovarian function, and the findings were combined in a meta-analysis. RESULTS: Three genome-wide significant (<5.0 × 10-8) and 16 genome-wide suggestive (<5.0 × 10-6) loci were associated with log-transformed AMH levels, adjusted for cyclophosphamide equivalent dose of alkylating agents, age at diagnosis, and age at study in the PanCareLIFE cohort. On the basis of the effect allele frequency (EAF) (>0.01 if not genome-wide significant), and biologic relevance, 15 single nucleotide polymorphisms were selected for replication. None of the single nucleotide polymorphisms were statistically significantly associated with AMH levels. A meta-analysis indicated that rs78861946 was associated with borderline genome-wide statistical significance (reference/effect allele: C/T; effect allele frequency: 0.04, beta (SE): -0.484 (0.091). CONCLUSION: This study found no genetic variants associated with a lower ovarian reserve after gonadotoxic treatment because the findings of this genome-wide association study were not statistically significant replicated in the replication cohort. Suggestive evidence for the potential importance of 1 variant is briefly discussed, but the lack of statistical significance calls for larger cohort sizes. Because the population of childhood cancer survivors is increasing, large-scale and systematic research is needed to identify genetic variants that could aid predictive risk models of gonadotoxicity as well as fertility preservation options for childhood cancer survivors.


Asunto(s)
Hormona Antimülleriana , Supervivientes de Cáncer , Estudio de Asociación del Genoma Completo , Reserva Ovárica , Polimorfismo de Nucleótido Simple , Humanos , Femenino , Reserva Ovárica/genética , Reserva Ovárica/efectos de los fármacos , Reserva Ovárica/efectos de la radiación , Adulto , Hormona Antimülleriana/sangre , Hormona Antimülleriana/genética , Adulto Joven , Antineoplásicos Alquilantes/efectos adversos , Neoplasias/genética , Neoplasias/tratamiento farmacológico , Factores de Riesgo , Niño , Adolescente , Europa (Continente)/epidemiología
17.
Int J Biol Macromol ; 271(Pt 2): 132461, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38777024

RESUMEN

In this study, a novel one-step coaxial electrospinning process is employed to fabricate shell-core structure fibers choosing Chlorella pyrenoidosa proteins (CP) as the core material. These nanofibers, serving as the wall material for probiotic encapsulation, aimed to enhance the stability and antioxidant activity of probiotics in food processing, storage, and gastrointestinal environments under sensitive conditions. Morphological analysis was used to explore the beads-on-a-string morphology and core-shell structure of the electrospun fibers. Probiotics were successfully encapsulated within the fibers (7.97 log CFU/g), exhibiting a well-oriented structure along the distributed fibers. Compared to free probiotics and uniaxial fibers loaded with probiotics, encapsulation within microalgae proteins/alginate core-shell structure nanofibers significantly enhanced the probiotic cells' tolerance to simulated gastrointestinal conditions (p < 0.05). Thermal analysis indicated that microalgae proteins/alginate core-shell structure nanofibers displayed superior thermal stability compared to uniaxial fibers. The introduction of CP resulted in a 50 % increase in the antioxidant capacity of probiotics-loaded microalgae proteins/alginate nanofibers compared to uniaxial alginate nanofibers, with minimal loss of viability (0.8 log CFU/g) after 28 days of storage at 4 °C. In summary, this dual-layer carrier holds immense potential in probiotic encapsulation and enhancing their resistance to harsh conditions.


Asunto(s)
Alginatos , Encapsulación Celular , Chlorella , Nanofibras , Probióticos , Nanofibras/química , Probióticos/administración & dosificación , Probióticos/química , Alginatos/química , Chlorella/química , Cápsulas/administración & dosificación , Cápsulas/química , Antioxidantes/administración & dosificación , Antioxidantes/química , Antioxidantes/farmacología , Encapsulación Celular/métodos
18.
J Neurosci ; 44(27)2024 Jul 03.
Artículo en Inglés | MEDLINE | ID: mdl-38724284

RESUMEN

While ipsilesional cortical electroencephalography has been associated with poststroke recovery mechanisms and outcomes, the role of the cerebellum and its interaction with the ipsilesional cortex is still largely unknown. We have previously shown that poststroke motor control relies on increased corticocerebellar coherence (CCC) in the low beta band to maintain motor task accuracy and to compensate for decreased excitability of the ipsilesional cortex. We now extend our work to investigate corticocerebellar network changes associated with chronic stimulation of the dentato-thalamo-cortical pathway aimed at promoting poststroke motor rehabilitation. We investigated the excitability of the ipsilesional cortex, the dentate (DN), and their interaction as a function of treatment outcome measures. Relative to baseline, 10 human participants (two women) at the end of 4-8 months of DN deep brain stimulation (DBS) showed (1) significantly improved motor control indexed by computerized motor tasks; (2) significant increase in ipsilesional premotor cortex event-related desynchronization that correlated with improvements in motor function; and (3) significant decrease in CCC, including causal interactions between the DN and ipsilesional cortex, which also correlated with motor function improvements. Furthermore, we show that the functional state of the DN in the poststroke state and its connectivity with the ipsilesional cortex were predictive of motor outcomes associated with DN-DBS. The findings suggest that as participants recovered, the ipsilesional cortex became more involved in motor control, with less demand on the cerebellum to support task planning and execution. Our data provide unique mechanistic insights into the functional state of corticocerebellar-cortical network after stroke and its modulation by DN-DBS.


Asunto(s)
Núcleos Cerebelosos , Estimulación Encefálica Profunda , Recuperación de la Función , Accidente Cerebrovascular , Humanos , Femenino , Estimulación Encefálica Profunda/métodos , Masculino , Persona de Mediana Edad , Accidente Cerebrovascular/fisiopatología , Accidente Cerebrovascular/terapia , Recuperación de la Función/fisiología , Anciano , Núcleos Cerebelosos/fisiopatología , Núcleos Cerebelosos/fisiología , Corteza Motora/fisiopatología , Rehabilitación de Accidente Cerebrovascular/métodos , Adulto , Electroencefalografía
19.
Animals (Basel) ; 14(9)2024 Apr 24.
Artículo en Inglés | MEDLINE | ID: mdl-38731273

RESUMEN

This study aimed to assess the impact of palm oil deodorizer distillate (POD) on the ruminal environment, including (i) microbial community, (ii) ruminal degradability, and (iii) apparent digestibility in sheep. The data used were derived from twenty rumen-cannulated sheep fed five isoproteic and isofiber diets based on elephant grass (Pennisetum purpureum Schum. cv. Roxo) silage supplemented with 0, 25, 50, 75, or 100 g kg-1 POD on a dry matter (DM) basis. Rumen fluid samples were collected three hours after feeding directly from the ventral sac of the rumen via a cannula and then subjected to DNA extraction, which was subsequently used for 16S rDNA amplification, followed by sequencing and diversity analysis. In this study, the microbial diversity was dominated by Bacteroidetes and Firmicutes, followed by Euryarchaetoa, Actinobacteria, and Tenericutes, in the ruminal environment, and was slightly modified when supplemented with the POD up to 100 g/kg (10%), leading to only a slight decrease in the diversity index. The ruminal degradability, ruminal fermentation parameters, and apparent digestibility were slightly compromised by the inclusion of up to 25 g of POD per kg of DM, and larger inclusions interfered with the ruminal degradability of fibrous fractions and the apparent digestibility of dry matter. This lipid supplement showed good results for feeding sheep and is an inexpensive and abundant alternative in the regional market.

20.
Foods ; 13(9)2024 Apr 29.
Artículo en Inglés | MEDLINE | ID: mdl-38731744

RESUMEN

Palm oil (PO), a semi-solid fat at room temperature, is a popular food ingredient. To steer the fat functionality, sucrose esters (SEs) are often used as food additives. Many SEs exist, varying in their hydrophilic-to-lipophilic balance (HLB), making them suitable for various food and non-food applications. In this study, a stearic-palmitic sucrose ester with a moderate HLB (6) was studied. It was found that the SE exhibited a complex thermal behavior consistent with smectic liquid crystals (type A). Small-angle X-ray scattering revealed that the mono- and poly-esters of the SE have different packings, more specifically, double and single chain-length packing. The polymorphism encountered upon crystallization was repeatable during successive heating and cooling cycles. After studying the pure SE, it was added to palm oil, and the crystallization behavior of the mixture was compared to that of pure palm oil. The crystallization conditions were varied by applying cooling at 20 °C/min (fast) and 1 °C/min (slow) to 0 °C, 20 °C or 25 °C. The samples were followed for one hour of isothermal time. Differential scanning calorimetry (DSC) showed that nucleation and polymorphic transitions were accelerated. Wide-angle X-ray scattering (WAXS) unraveled that the α-to-ß' polymorphic transition remained present upon the addition of the SE. SAXS showed that the addition of the SE at 0.5 wt% did not significantly change the double chain-length packing of palm oil, but it decreased the domain size when cooling in a fast manner. Ultra-small-angle X-ray scattering (USAXS) revealed that the addition of the SE created smaller crystal nanoplatelets (CNPs). The microstructure of the fat crystal network was visualized by means of polarized light microscopy (PLM) and cryo-scanning electron microscopy (cryo-SEM). The addition of the SE created a finer and space-filling network without the visibility of separate floc structures.

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