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1.
Phys Med Biol ; 2024 Sep 23.
Artículo en Inglés | MEDLINE | ID: mdl-39312945

RESUMEN

OBJECTIVE: Given the different noise distribution information of global and local magnetic resonance (MR) images, this study aims to extend the current work on convolutional neural networks that preserve global structure and local details in MR image denoising tasks. APPROACH: This study proposed a parallel and serial network for denoising 3D MR images, called 3D-PSNet. We use the residual depthwise separable convolution block to learn the local information of the feature map, reduce the network parameters, and thus improve the training speed and parameter efficiency. In addition, we consider the feature extraction of the global image and utilize residual dilated convolution to process the feature map to expand the receptive field of the network and avoid the loss of global information. Finally, we combine both of them to form a parallel network. What's more, we integrate reinforced residual convolution blocks with dense connections to form serial network branches, which can remove redundant information and refine features to further obtain accurate noise information. The peak signal-to-noise ratio, structural similarity index measure, and root mean square error metrics of 3D-PSNet are as high as 47.79%, 99.81%, and 0.40%, respectively, achieving competitive denoising effect on three public datasets. The ablation experiments demonstrated the effectiveness of all the designed modules regarding all the evaluated metrics in both datasets. SIGNIFICANCE: The proposed 3D-PSNet takes advantage of multi-scale receptive fields, local feature extraction and residual dense connections to more effectively restore the global structure and local fine features in MR images, and is expected to help doctors quickly and accurately diagnose patients' conditions.

2.
Nanomaterials (Basel) ; 14(17)2024 Sep 08.
Artículo en Inglés | MEDLINE | ID: mdl-39269121

RESUMEN

We attained wurtzite ScxAl1-xN (0.16 ≤ x ≤ 0.37) thin films by varying the Sc and Al fluxes at a fixed active nitrogen flux during plasma-assisted molecular beam epitaxy. Atomic fluxes of Sc and Al sources via measured Sc percentage in as-grown ScxAl1-xN thin films were derived as the feedback for precise determination of the ScxAl1-xN growth diagram. We identified an optimal III/N atomic flux ratio of 0.78 for smooth Sc0.18Al0.82N thin films. Further increasing the III/N ratio led to phase separation under N-rich conditions, validated by the observation of high-Sc-content hillocks with energy-dispersive X-ray spectroscopy mapping. At the fixed III/N ratio of 0.78, we found that phase separation with high-Al-content hillocks occurs for x > 0.37, which is substantially lower than the thermodynamically dictated threshold Sc content of ~0.55 in wurtzite ScxAl1-xN. We postulate that these wurtzite-phase purity degradation scenarios are correlated with adatom diffusion and the competitive incorporation process of Sc and Al. Therefore, the ScxAl1-xN growth window is severely restricted by the adatom kinetics. We obtained single crystalline Sc0.37Al0.63N thin films with X-ray diffraction (002)/(102) ω rocking curve full-width at half-maximums of 2156 arcsec and 209 arcsec and surface roughness of 1.70 nm. Piezoelectric force microscopy probing of the Sc0.37Al0.63N epilayer validates unambiguous polarization flipping by 180°.

3.
Int J Mol Sci ; 25(17)2024 Sep 06.
Artículo en Inglés | MEDLINE | ID: mdl-39273616

RESUMEN

Chemotherapy is an important treatment option for advanced prostate cancer, especially for metastatic prostate cancer (PCa). Resistance to first-line chemotherapeutic drugs such as docetaxel often accompanies prostate cancer progression. Attempts to overcome resistance to docetaxel by combining docetaxel with other biological agents have been mostly unsuccessful. A better understanding of the mechanisms underlying docetaxel resistance may provide new avenues for the treatment of advanced PCa. We have previously found that the fatty acid-binding protein 12 (FABP12)-PPARγ pathway modulates lipid-related bioenergetics and PCa metastatic transformation through induction of Slug, a master driver of epithelial-to-mesenchymal transition (EMT). Here, we report that the FABP12-Slug axis also underlies chemoresistance in PCa cells. Cell sensitivity to docetaxel is markedly suppressed in FABP12-expressing cells, along with induction of Survivin, a typical apoptosis inhibitor, and inhibition of cleaved PARP, a hallmark of programmed cell death. Importantly, Slug depletion down-regulates Survivin and restores cell sensitivity to docetaxel in FABP12-expressing cells. Finally, we also show that high levels of Survivin are associated with poor prognosis in PCa patients, with FABP12 status determining its prognostic significance. Our research identifies a FABP12-Slug-Survivin pathway driving docetaxel resistance in PCa cells, suggesting that targeting FABP12 may be a precision approach to improve chemodrug efficacy and curb metastatic progression in PCa.


Asunto(s)
Docetaxel , Proteínas de Unión a Ácidos Grasos , Neoplasias de la Próstata , Factores de Transcripción de la Familia Snail , Survivin , Humanos , Masculino , Docetaxel/farmacología , Neoplasias de la Próstata/metabolismo , Neoplasias de la Próstata/patología , Neoplasias de la Próstata/tratamiento farmacológico , Neoplasias de la Próstata/genética , Proteínas de Unión a Ácidos Grasos/metabolismo , Proteínas de Unión a Ácidos Grasos/genética , Survivin/metabolismo , Survivin/genética , Factores de Transcripción de la Familia Snail/metabolismo , Factores de Transcripción de la Familia Snail/genética , Línea Celular Tumoral , Resistencia a Antineoplásicos/efectos de los fármacos , Transducción de Señal/efectos de los fármacos , Antineoplásicos/farmacología , Apoptosis/efectos de los fármacos , Regulación Neoplásica de la Expresión Génica/efectos de los fármacos , Transición Epitelial-Mesenquimal/efectos de los fármacos , Muerte Celular/efectos de los fármacos
4.
BMC Biol ; 22(1): 203, 2024 Sep 11.
Artículo en Inglés | MEDLINE | ID: mdl-39256728

RESUMEN

BACKGROUND: Mutations occurring in nucleic acids or proteins may affect the binding affinities of protein-nucleic acid interactions. Although many efforts have been devoted to the impact of protein mutations, few computational studies have addressed the effect of nucleic acid mutations and explored whether the identical methodology could be applied to the prediction of binding affinity changes caused by these two mutation types. RESULTS: Here, we developed a generalized algorithm named PNBACE for both DNA and protein mutations. We first demonstrated that DNA mutations could induce varying degrees of changes in binding affinity from multiple perspectives. We then designed a group of energy-based topological features based on different energy networks, which were combined with our previous partition-based energy features to construct individual prediction models through feature selections. Furthermore, we created an ensemble model by integrating the outputs of individual models using a differential evolution algorithm. In addition to predicting the impact of single-point mutations, PNBACE could predict the influence of multiple-point mutations and identify mutations significantly reducing binding affinities. Extensive comparisons indicated that PNBACE largely performed better than existing methods on both regression and classification tasks. CONCLUSIONS: PNBACE is an effective method for estimating the binding affinity changes of protein-nucleic acid complexes induced by DNA or protein mutations, therefore improving our understanding of the interactions between proteins and DNA/RNA.


Asunto(s)
Algoritmos , ADN , Mutación , Unión Proteica , ADN/metabolismo , Biología Computacional/métodos , Proteínas de Unión al ADN/metabolismo , Proteínas de Unión al ADN/genética
5.
Transl Psychiatry ; 14(1): 380, 2024 Sep 18.
Artículo en Inglés | MEDLINE | ID: mdl-39294141

RESUMEN

Social isolation (SI) is a common phenomenon in the modern world, especially during the coronavirus disease 2019 pandemic, and causes lasting cognitive impairments and mental disorders. However, it is still unclear how SI alters molecules in the brain and induces behavioural dysfunctions. Here, we report that SI impairs cognitive function and induces depressive-like behaviours in C57BL/6 J mice, in addition to impairing synaptic plasticity and increasing the levels of APP cleavage-related enzymes, thereby promoting Aß production. Moreover, we show that in APP/PS1 transgenic mice, SI accelerates pathological changes and behavioural deficits. Interestingly, downregulation of the expression of the BACE1 attenuates SI-induced Aß toxicity and synaptic dysfunction. Furthermore, early intervention with BACE1 shRNA blocks SI-induced cognitive impairments. Together, our data strongly suggest that SI-induced upregulation of BACE1 expression mediates Aß toxicity and induces behavioural deficits. Down-regulation of BACE1 may be a promising strategy for preventing SI-induced cognitive impairments.


Asunto(s)
Secretasas de la Proteína Precursora del Amiloide , Péptidos beta-Amiloides , Ácido Aspártico Endopeptidasas , Disfunción Cognitiva , Ratones Endogámicos C57BL , Ratones Transgénicos , Aislamiento Social , Animales , Secretasas de la Proteína Precursora del Amiloide/metabolismo , Secretasas de la Proteína Precursora del Amiloide/genética , Ácido Aspártico Endopeptidasas/metabolismo , Ácido Aspártico Endopeptidasas/genética , Aislamiento Social/psicología , Ratones , Péptidos beta-Amiloides/metabolismo , Disfunción Cognitiva/metabolismo , Plasticidad Neuronal , Masculino , Modelos Animales de Enfermedad , Precursor de Proteína beta-Amiloide/genética , Precursor de Proteína beta-Amiloide/metabolismo , COVID-19 , Sinapsis/metabolismo
6.
BMC Womens Health ; 24(1): 484, 2024 Sep 03.
Artículo en Inglés | MEDLINE | ID: mdl-39227947

RESUMEN

BACKGROUND: Yolk sac tumor (YST) is a highly malignant germ cell tumor, a majority of which originate from the gonads and are extremely rare from endometrium. CASE PRESENTATION: Here we present a case of a 42-year-old woman suffered from primary pure yolk sac tumor of the endometrium complicated with situs inversus totalis. The patient presented at our hospital with irregular vaginal bleeding. Imageological examination showed a space-occupying lesion in the cervix and the serum Alpha-fetoprotein (AFP) level was significantly high (more than 1210ng/ml). Then she underwent total hysterectomy, bilateral salpingo-oophorectomy and pelvic lymph node dissection. The subsequent postoperative pathological diagnosis was yolk sac tumor arising from the endometrium. Next, the patient was treated with 6 cycles of chemotherapy with Pingyangmycin, etoposide and cisplatin regimen and was alive without evidence of recurrence or distant metastases for 13 months. CONCLUSIONS: This rare disease needs to be differentiated from endometrial epithelial neoplasia and the significant increase in AFP is helpful for diagnosis. Combined with previous literature reports, comprehensive staging laparotomy or maximum cytoreductive surgery complemented by standard chemotherapy can usually achieve a good efficacy.


Asunto(s)
Tumor del Seno Endodérmico , Neoplasias Endometriales , Situs Inversus , Humanos , Femenino , Tumor del Seno Endodérmico/complicaciones , Tumor del Seno Endodérmico/diagnóstico , Tumor del Seno Endodérmico/patología , Adulto , Situs Inversus/complicaciones , Situs Inversus/diagnóstico , Neoplasias Endometriales/complicaciones , Neoplasias Endometriales/diagnóstico , Neoplasias Endometriales/patología , alfa-Fetoproteínas/análisis , Histerectomía/métodos
7.
Artículo en Inglés | MEDLINE | ID: mdl-39322652

RESUMEN

Over past two years, a total of 39,918 hematopoietic stem cell transplantation (HSCT) cases were reported, with 18,194 and 21,714 transplants performed in 2022 and 2023, respectively. Autologous HSCT accounted for 6562 cases (31%) in 2022, while allogeneic HSCT comprised 12,632 cases (69%). In 2023, the number of allogeneic HSCTs exceeded 15,000, maintaining a 69% share. Participation in the 2022 and 2023 surveys included 193 and 212 transplantation teams, respectively, from 27 provinces, municipalities, or autonomous regions. The leading indication of HSCT was acute leukemia, including acute myeloid leukemia (AML), acute lymphoblastic leukemia (ALL), and mixed phenotype acute leukemia, with a total of 17,421 cases. AML was the most common disease (10,339, 38%) for allogeneic HSCT, which was followed by ALL (5925 cases, 21%). Peripheral blood emerged as the primary source of stem cell grafts, utilized in 54% of matched sibling donor transplants and 77% of haploidentical donor transplants. The BuCy-based conditioning regimen was the most prevalent, used in 53% of allogeneic HSCT cases in the past two years. This survey offers a comprehensive overview of the current HSCT landscape and serves as a valuable resource for clinical practice.

8.
Surg Endosc ; 2024 Sep 25.
Artículo en Inglés | MEDLINE | ID: mdl-39322827

RESUMEN

The aim of this meta-analysis was to evaluate the efficacy and safety of robotic pancreaticoduodenectomy (RPD) in improving perioperative aspects and postoperative complications in patients. METHODS: We searched PubMed, Embase, Web of Science, and the Cochrane Library database systems for studies that compared RPD with laparoscopic pancreaticoduodenectomy (LPD). Meta-analysis was performed for 24 relevant outcomes, including perioperative outcomes and postoperative complications. Subsequently, a subgroup analysis based on geographical regions was conducted to investigate the impact of regional differences on the perioperative outcomes of the RPD group and the LPD group. RESULTS: This review found 19 studies with 12,731 individuals (3539 RPD and 9192 LPD). In comparison to LPD, RPD had lower rates of Conversion (OR = 0.58, P < 0.00001), Blood Transfusion (OR = 0.59, P = 0.02), Length of Stay (MD = - 0.54, P = 0.01), postoperative complications [Pneumonia (OR = 0.31, P < 0.0001), and Wound Disruption (OR = 0.26, P = 0.0007)], and more thorough lymph node harvesting (MD = 1.25, P = 0.001). Subgroup analysis showed that Blood Transfusion (I2 = 55%, P = 0.02), Conversion (I2 = 30%, P < 0.00001), Length of Stay (I2 = 71%, P = 0.01), and Lymph Node Harvested (I2 = 87%, P = 0.001) were statistically significant. Interestingly, compared to China, other countries had lower rates of Conversion and more lymph nodes harvested for RPD surgery. CONCLUSION: The benefits of RPD surgery over LPD surgery in terms of therapy and an optimistic short-term prognosis are clearly supported by this study. Moreover, subgroup analysis based on regional differences revealed statistically significant results for Conversion, Length of Stay (days), Number of Lymph Nodes Harvested and the rate of Blood Transfusion, indicating significant variability across regions. This study provides a solid theoretical foundation and basis for the advancement of RPD in clinical practice.

9.
Front Hum Neurosci ; 18: 1464152, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39296915

RESUMEN

Introduction: Freezing of gait (FOG) is a disabling and heterogeneous symptom in patients with Parkinson's disease (PD). Among them, dopamine-induced FOG is rare and difficult to identify. The treatment of dopamine-induced FOG is complex. Case presentation: We herein presented a case of PD patient who complicated with refractory FOG. It was identified as dopamine-induced FOG during levodopa challenge test. Her symptoms were alleviated after we reduced the total equivalent dosage of levodopa. Conclusion: Our report emphasizes the importance of levodopa challenge test in identifying different types of FOG, which is very important for further adjusting treatment.

11.
Artículo en Inglés | MEDLINE | ID: mdl-39299550

RESUMEN

PURPOSE: To compare the outcomes of transarterial chemoembolization (TACE) alone with those of TACE combined with external-beam radiotherapy (EBRT) in patients with hepatocellular carcinoma (HCC) in a multicenter randomized study. METHODS AND MATERIALS: From 2017 to 2022, 74 HCC patients with tumors confined to the liver without vascular invasion were treated with either TACE only (TACE group, 39 patients) or TACE combined with EBRT (TACE+EBRT group, 35 patients). The primary outcome measured was overall survival (OS). Secondary outcomes included progression-free survival (PFS), local tumor control (LC), and the assessment of treatment-related toxicity. RESULTS: Due to slow accrual, the trial was closed prematurely after enrolling 74 patients. All patients received two cycles of TACE before randomization. The TACE and TACE+EBRT groups showed comparable patient and tumor characteristics. The TACE group underwent an median of 3 TACE cycles, and the TACE+EBRT group received two cycles of TACE and a median of 5,500 cGy in 15 fractions. For the TACE group, the median LC duration was 13.1 months, while for the TACE+EBRT group, the median LC was not achieved (P<0.001). The PFS was recorded at 11.6 months in the TACE group compared to 15.4 months in the TACE+EBRT group (P=0.072). The median OS reached 36.8 months for the TACE group and extended to 47.1 months for the TACE+EBRT group (P=0.654). The incidence of toxicity was comparable between both groups. CONCLUSIONS: Although the number of patients enrolled in this clinical trial did not meet expectations. TACE combined with EBRT was shown to be more effective than TACE alone in improving local control (LC) without increasing toxicity, while PFS and OS was slightly improved. TACE+EBRT can be used as a standard treatment option for patients with inoperable but confined intrahepatic HCC.

12.
Medicine (Baltimore) ; 103(38): e39501, 2024 Sep 20.
Artículo en Inglés | MEDLINE | ID: mdl-39312313

RESUMEN

High-throughput immune repertoire (IR) sequencing provides direct insight into the diversity of B cell receptor (BCR) and T cell receptor (TCR), with great potential to revolutionize the diagnosis, monitoring, and prevention of immune system-related disorders. In this study, multiplex PCR was applied to amplify the complementarity-determining regions of BCR and TCR, followed by comprehensive analysis by high-throughput sequencing. We compare the TCR (BCR) of bone marrow fluid (BMF) and peripheral blood (PB) samples from 17 patients in the Epstein-Barr and immunodeficiency groups, respectively. Our study shows that the diversity of the IR of blood samples is very similar to that of bone marrow samples statistically. However, the distributions of the monoclonal genes are significantly different in these 2 samples of most patients. This suggests that the BMFs can be replaced by the PB samples in diversity detection of IR to monitor the immune status of the body, while the detection of the BMFs is unreplaceable when the monoclonal change occurs. We used high-throughput sequencing to assess the TCR and BCR of the patients and provide a basis for the clinical analysis of PB and bone marrow samples and selection of disease diagnosis and monitoring methods.


Asunto(s)
Médula Ósea , Infecciones por Virus de Epstein-Barr , Secuenciación de Nucleótidos de Alto Rendimiento , Receptores de Antígenos de Linfocitos T , Humanos , Estudios Retrospectivos , Infecciones por Virus de Epstein-Barr/inmunología , Masculino , Femenino , Médula Ósea/inmunología , Receptores de Antígenos de Linfocitos T/genética , Receptores de Antígenos de Linfocitos T/inmunología , Receptores de Antígenos de Linfocitos B/genética , Receptores de Antígenos de Linfocitos B/inmunología , Niño , Adulto , Adolescente , Síndromes de Inmunodeficiencia/inmunología , Síndromes de Inmunodeficiencia/genética , Preescolar , Persona de Mediana Edad , Adulto Joven
13.
Front Immunol ; 15: 1408347, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39267738

RESUMEN

Background: Coronary artery disease (CAD) imposes a significant global health burden, necessitating a deeper comprehension of its genetic foundations to uncover innovative therapeutic targets. Employing a comprehensive Mendelian randomization (MR) approach, we aimed to explore the genetic associations between lipid profiles, immune cell phenotypes, and CAD risk. Methods: Utilizing data from recent large-scale genome-wide association studies (GWAS), we scrutinized 179 lipid and 731 immune cell phenotypes to delineate their genetic contributions to CAD pathogenesis, including coronary artery calcification (CAC). Moreover, specific immune cell phenotypes were examined as potential mediators of the lipid-CAD/CAC causal pathway. Results: Among the 162 lipid species with qualified instrumental variables (IVs) included in the analysis, we identified 36 lipids that exhibit a genetic causal relationship with CAD, with 29 being risk factors and 7 serving as protective factors. Phosphatidylethanolamine (18:0_20:4) with 8 IVs (OR, 95% CI, P-value: 1.04, 1.02-1.06, 1.50E-04) met the Bonferroni-corrected significance threshold (0.05/162 = 3.09E-04). Notably, all 18 shared lipids were determined to be risk factors for both CAD and CAC, including 16 triacylglycerol traits (15 of which had ≥ 3 IVs), with (50:1) exhibiting the highest risk [OR (95% CI) in CAC: 1.428 (1.129-1.807); OR (95% CI) in CAD: 1.119 (1.046-1.198)], and 2 diacylglycerol traits. Furthermore, we identified HLA DR+ natural killer cells (IVs = 3) as nominally significant with lipids and as potential mediators in the causal pathway between diacylglycerol (16:1_18:1) or various triacylglycerols and CAD (mediated effect: 0.007 to 0.013). Conclusions: This study provides preliminary insights into the genetic correlations between lipid metabolism, immune cell dynamics, and CAD susceptibility, highlighting the potential involvement of natural killer cells in the lipid-CAD/CAC causal pathway and suggesting new targets for therapy. Further evidence is necessary to substantiate our findings.


Asunto(s)
Enfermedad de la Arteria Coronaria , Predisposición Genética a la Enfermedad , Estudio de Asociación del Genoma Completo , Células Asesinas Naturales , Análisis de la Aleatorización Mendeliana , Humanos , Enfermedad de la Arteria Coronaria/inmunología , Enfermedad de la Arteria Coronaria/genética , Células Asesinas Naturales/inmunología , Células Asesinas Naturales/metabolismo , Calcificación Vascular/inmunología , Calcificación Vascular/genética , Lípidos , Metabolismo de los Lípidos/genética , Factores de Riesgo , Fenotipo , Polimorfismo de Nucleótido Simple
14.
Food Res Int ; 194: 114915, 2024 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-39232535

RESUMEN

Aspergillus carbonarius, a common food-contaminating fungus, produces ochratoxin A (OTA) and poses a risk to human health. This study aimed to assess the inhibitory activity of tea tree essential oil and its main components, Terpene-4-ol (T4), α-terpineol (αS), and 3-carene (3C) against A. carbonarius. The study showed αS and T4 were the main antifungal components of tea tree essential oil, which primarily inhibit A. carbonarius growth through cell membrane disruption, reducing antioxidant enzyme activities (catalase, peroxidase, superoxide dismutase) and interrupting the tricarboxylic acid cycle. Furthermore, αS and T4 interacted with enzymes related to OTA biosynthesis. Molecular docking and molecular dynamics show that they bound mainly to P450 with a minimum binding energy of -7.232 kcal/mol, we infered that blocking the synthesis of OTA precursor OTß. Our hypothesis was preliminarily verified by the detection of key substances in the OTA synthesis pathway. The results of UHPLC-QTOF-MS2 analysis demonstrated that T4 achieved a degradation rate of 43 % for OTA, while αS reached 29.6 %, resulting in final breakdown products such as OTα and phenylalanine. These results indicated that α-terpinol and Terpene-4-ol have the potential to be used as naturally safe and efficient preservatives or active packaging to prevent OTA contamination.


Asunto(s)
Aspergillus , Monoterpenos Ciclohexánicos , Simulación del Acoplamiento Molecular , Ocratoxinas , Terpenos , Ocratoxinas/metabolismo , Ocratoxinas/biosíntesis , Aspergillus/metabolismo , Aspergillus/efectos de los fármacos , Terpenos/metabolismo , Aceite de Árbol de Té/farmacología , Aceite de Árbol de Té/química , Monoterpenos/farmacología , Monoterpenos/metabolismo , Antifúngicos/farmacología , Antifúngicos/química , Monoterpenos Bicíclicos
15.
Food Res Int ; 195: 114983, 2024 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-39277244

RESUMEN

Astaxanthin (AST), the natural pigment in Litopenaeus vannamei, is susceptible to oxidation and isomerization, leading to the fading of the orange-red color in ready-to-eat (RTE) shrimps. This study specifically investigated the changes mechanism in AST content, including geometric and stereoisomers, as well as oxidation degradation, throughout the storage process of RTE shrimps. The results showed that the total amount of AST decreased by 46.76 % after 45 days of storage at 40 °C. The levels of geometric isomers (all-E, 9-Z, 13-Z) and stereoisomers (3S,3'S, 3S,3'R, 3R,3'R) gradually decreased over time. Notably, 9-Z and 3S,3'S isomers, known for their strong antioxidant activity, were reduced by 83.57 % and 61.64 % respectively. Additionally, AST underwent oxidative degradation, forming short-chain compounds (astaxanthinal or astaxanthinone), with the main products being Apo-14'-astaxanthinal and Apo-7-astaxanthinone DHA ester. These findings provide a theoretical foundation for further research on the degradation mechanism of AST, and offer valuable insights into the color protection of RTE shrimps.


Asunto(s)
Almacenamiento de Alimentos , Oxidación-Reducción , Penaeidae , Xantófilas , Xantófilas/química , Animales , Penaeidae/química , Isomerismo , Antioxidantes/química , Mariscos/análisis , Estereoisomerismo
16.
Inorg Chem ; 2024 Sep 18.
Artículo en Inglés | MEDLINE | ID: mdl-39291763

RESUMEN

Photocatalytic selective oxidation of organic substances coupled with hydrogen production is believed to be one of the most favorable pathways to make full use of photogenerated charge carriers. However, this catalytic reaction is often discouraged due to the rapid recombination of photogenerated carriers in practical applications. In this work, a core-shell CdS@Cu-TCPP-Pt nanorod heterojunction was dexterously designed for boosting the photocatalytic dehydrogenation performance of benzylamine. The transient absorption results revealed that the photogenerated electron-holes could be effectively separated by properly matching the energy levels in CdS@Cu-TCPP. Surprisingly, Pt embedded in Cu-TCPP not only provided abundant hydrogen production active sites but also facilitated ultrafast charge transfer, which endowed CdS@Cu-TCPP-Pt with remarkable photocatalytic performances for the coproductions of N-benzylidenebenzylamine (1 mL) with a conversion of 23.48% and H2 (20.75 mmol g-1 h-1) under visible irradiation, far surpassing those of CdS and Cu-TCPP. Obviously, the present work verifies that designing and fabricating a hybrid photocatalyst with high separation efficiency of electron-hole pairs is also a significant avenue for other high-performance cooperative dual-functional photocatalytic reactions.

17.
J Vis Exp ; (210)2024 Aug 23.
Artículo en Inglés | MEDLINE | ID: mdl-39248532

RESUMEN

Myosin-7a is an actin-based motor protein vital for auditory and visual processes. Mutations in myosin-7a lead to Usher syndrome type 1, the most common and severe form of deaf-blindness in humans. It is hypothesized that myosin-7a forms a transmembrane adhesion complex with other Usher proteins, essential for the structural-functional integrity of photoreceptor and cochlear hair cells. However, due to the challenges in obtaining pure, intact protein, the exact functional mechanisms of human myosin-7a remain elusive, with limited structural and biomechanical studies available. Recent studies have shown that mammalian myosin-7a is a multimeric motor complex consisting of a heavy chain and three types of light chains: regulatory light chain (RLC), calmodulin, and calmodulin-like protein 4 (CALML4). Unlike calmodulin, CALML4 does not bind to calcium ions. Both the calcium-sensitive, and insensitive calmodulins are critical for mammalian myosin-7a for proper fine-tuning of its mechanical properties. Here, we describe a detailed method to produce recombinant human myosin-7a holoenzyme using the MultiBac Baculovirus protein expression system. This yields milligram quantities of high-purity full-length protein, allowing for its biochemical and biophysical characterization. We further present a protocol for assessing its mechanical and motile properties using tailored in vitro motility assays and fluorescence microscopy. The availability of the intact human myosin-7a protein, along with the detailed functional characterization protocol described here, paves the way for further investigations into the molecular aspects of myosin-7a in vision and hearing.


Asunto(s)
Miosina VIIa , Humanos , Miosina VIIa/metabolismo , Miosina VIIa/genética , Miosinas/química , Miosinas/metabolismo , Miosinas/genética , Miosinas/aislamiento & purificación , Animales , Baculoviridae/genética , Baculoviridae/metabolismo , Células Sf9 , Spodoptera
18.
Cladistics ; 2024 Sep 11.
Artículo en Inglés | MEDLINE | ID: mdl-39258812

RESUMEN

The c. 270 endemic species of Pedicularis in the Himalaya-Hengduan Mountains (HHM) region exhibit high diversity in geographic distribution, elevational range and floral morphology. Many of these, including the species with the longest corolla tubes and beaked galeas, are monophyletic and represent a putative in situ radiation. In this study, we focus on the representative Clade 3 within the HHM region. We integrate the plastid phylogeny of this clade with environmental data and species distributions to infer environmental correlates of species diversity. We estimate macroevolutionary rates and reconstructed ancestral states for geographic ranges and corolla traits, and analyse patterns of range overlap and niche evolution to assess drivers of diversification in the HHM region. Our results show that the region from northwest Yunnan to southwest Sichuan is the centre of diversity for this clade of Pedicularis. Rates of diversification are associated with precipitation and multiple environmental factors. Multiple range expansions from the Sanjiang (Three Parallel Rivers) region, followed by allopatric speciation across the HHM region, contributed to early rapid diversification. Corolla traits are not significantly associated with species diversification. This study highlights the importance of integrated evidence for understanding species diversification dynamics and contributes to our understanding of the origins of the remarkable richness of plant species in the HHM region.

19.
Sci Rep ; 14(1): 20893, 2024 09 08.
Artículo en Inglés | MEDLINE | ID: mdl-39245669

RESUMEN

Investigate the impact of remnant cholesterol (RC) levels on carotid artery intima thickness (CIT) in type 2 diabetes mellitus (T2DM) patients. From September 2021 to September 2023, a prospective multicenter study involved 158 T2DM patients. They were divided into a higher RC group (n = 80) and a lower RC group (n = 78) based on median RC levels. Additionally, 92 healthy volunteers served as the control group. CIT, carotid media thickness (CMT), and carotid intima-media thickness (CIMT) were measured. General clinical data, lab results, CIMT, CIT, and CMT differences among the three groups were compared. Multiple regression analysis explored CIT factors in T2DM patients. 1. No significant sex, age, BMI, high-density lipoprotein cholesterol (HDL-C), T2DM duration, fasting blood glucose, or glycated hemoglobin differences were found among the groups (p > 0.05). 2. CIMT and CIT were significantly higher in T2DM than the control group (p < 0.05). 3. The higher RC group had thicker CIT than the lower RC group (p < 0.05), while CIMT differences were not significant (p > 0.05). Multiple linear regression analysis showed RC as an influencing CIT factor in T2DM patients (ß = 0.473, p = 0.005). CIT is significantly thicker in T2DM patients with higher RC than in those with lower RC, and RC is the influence factor of CIT, which suggests that more attention should be paid to the detection of RC in T2DM patients.


Asunto(s)
Grosor Intima-Media Carotídeo , Colesterol , Diabetes Mellitus Tipo 2 , Humanos , Diabetes Mellitus Tipo 2/sangre , Diabetes Mellitus Tipo 2/patología , Masculino , Femenino , Persona de Mediana Edad , Colesterol/sangre , Estudios Prospectivos , Anciano , Estudios de Casos y Controles , Adulto , Factores de Riesgo
20.
J Inflamm Res ; 17: 5801-5805, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39224656

RESUMEN

Purpose: Recurrent inflammatory fevers with multisystem involvement occur clinically and may indicate an autoimmune disease. Case: We present a young male diagnosed with pulmonary embolism who experienced recurrent fever during hospitalization and was unresponsive to antibiotics and antipyretics. A follow-up history revealed chronic oral and genital ulcers, leading to a final diagnosis of Behçet's disease. Conclusion: The patient's temperature normalized rapidly after corticosteroid therapy, and infection markers returned to normal. Complete remission was achieved with immunosuppression and glucocorticoid therapy. Reporting characteristics, treatment experience, and outcomes of such cases are essential to inform future diagnosis and management strategies.

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