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1.
J Cancer ; 15(8): 2137-2146, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38495497

RESUMO

Background. Tripartite motif-containing 22 (TRIM22) is characterized by a canonical RING domain with ubiquitin E3 ligase activity and is closely associated with tumorigenesis. As a product of TRIM22 transcription, whether hsa_circ_TRIM22 has a function of regulating tumorigenesis is unclear. Thus, we aimed to explore the role and mechanism of hsa_circ_TRIM22 in human papillomavirus (HPV) 16 positive cervical cancer (CC). Methods. We collected HPV16-positive cervical tissues including chronic cervicitis, high-grade squamous intraepithelial lesions (HSIL), low-grade squamous intraepithelial lesions (LSIL), and CC, and along with CC cell lines to detect the hsa_circ_TRIM22 level using real-time fluorescence quantitative polymerase chain reaction (RT-qPCR). Hsa_circ_TRIM22 was silenced using specific short hairpin ribonucleic acid (shRNA) in CC cell lines and functional assays were performed thereafter. Mechanistically, the targeting and regulatory relationship between hsa_circ_TRIM22 and miR-154-5p were confirmed using the luciferase report assay and rescue experiments. Results. We found hsa_circ_TRIM22 expression level was significantly higher in CC cells and tissues. Further, hsa_circ_TRIM22 knockdown inhibited migration, proliferation, invasiveness, enhanced apoptosis, and slowed the cell cycle. Mechanistically, hsa_circ_TRIM22 could bind miR-154-5p and prevent miR-154-5p from reducing the levels of Cullin2 (CUL2). Notably, the application of miR-154-5p inhibitor significantly rescued hsa_circ_TRIM22-mediated tumorigenesis. Conclusions. Our observations suggest hsa_circ_TRIM22 is upregulated in HPV16-positive CC and promotes CC progression by regulating the miR-154-5p/CUL2 axis, thereby serving as a promising candidate for diagnosis and treatments of CC.

2.
Mar Environ Res ; 196: 106444, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38484649

RESUMO

To study the environmental responses of tropical cyclones (TCs) in continental shelf regions, TCs passing over the Yellow Sea and Bohai Sea (YBS) during 2002-2020 were investigated, with a special focus on how competition between ocean thermal structure and TC characteristics modulates ocean surface changes. The spatial distributions of the climatic mixed layer depth (MLD), accumulated wind forcing power index (WPi), accumulated sea surface temperature (SST) changes and accumulated chlorophyll (Chl-a) changes in the YBS were calculated. The linear regressions indicate that both the TC-induced SST cooling and TC-induced Chl-a increase are correlated with the TC wind speed rather than the translation speed, especially when the TC forcing depth (Zmixing) is greater than the MLD. Otherwise, both the changes in SST and Chl-a are correlated with the TC translation speed when Zmixing is shallower than the MLD. Further study has shown that whether TCs can break the MLD is also a key condition for oceanic responses. In the southern YBS, which has a deep-sea basin and MLD, the TC wind speed is the major factor affecting SST cooling and Chl-a increase, as TCs need more strength to reach the MLD. However, in the northern YBS, which has the shallowest sea basin and MLD, even weak TCs can easily break the MLD and reach the seabed; thus, ocean surface changes are associated mainly with the TC translation speed. The composite results reveal that both the maximum SST cooling center (1.64 °C) and the maximum Chl-a increasing center (0.14 log10(mg/m3)) are located on the right and behind the TC center, respectively. In addition, TC-induced SST cooling and Chl-a increase were initiated two days prior to TC passage and then reached their maximum values after 1 day. It takes approximately 7-8 days for the Chl-a concentration to recover, but it takes a much longer time (>15 days) for the SST to recover.


Assuntos
Tempestades Ciclônicas , Temperatura , Oceanos e Mares , Clorofila , Modelos Lineares
3.
Int J Biol Macromol ; 260(Pt 1): 129486, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38237833

RESUMO

Akebia trifoliata is a fascinating economic and medicinal plant that produces functionally unisexual flowers due to stamen/pistil abortion during flower development, and the genetic regulation pathway of this process remain completely unknown. Here, 10 AktWOXs were identified for the first time, all contained a highly conserved homeodomain. AktWOXs were divided into three clades, each with the same or similar intron, exon, and motifs distribution. Many cis-elements related to stress response, growth and development, and hormone response were found in the AktWOXs promoter region. In addition, four candidate genes AktWOX8, AktWOX11, AktWOX13.2 and AktWUS that might be involved in unisexual flowers development were screened, all of which were located in the nucleus and showed transcriptional activation activity. Yeast one-hybrid showed that both AktKNU and AktAG1, the potential core transcription factors in the activity termination pathway of flower meristem stem cells, could bind to the promoter region of AktWUS. Dual-luciferase assay further confirmed that only AktKNU inhibited the expression of AktWUS. Collectively, this study revealed the mechanism of AktWUS that might affect the formation of unisexual flowers by regulating the timely termination of flower meristem in A. trifoliata.


Assuntos
Proteínas de Plantas , Fatores de Transcrição , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Reprodução , Flores/genética , Genes de Plantas , Regulação da Expressão Gênica de Plantas
4.
Int J Mol Sci ; 24(24)2023 Dec 14.
Artigo em Inglês | MEDLINE | ID: mdl-38139310

RESUMO

The present challenge in dental pulp tissue engineering scaffold materials lies in the development of tissue-specific scaffolds that are conducive to an optimal regenerative microenvironment and capable of accommodating intricate root canal systems. This study utilized porcine dental pulp to derive the decellularized extracellular matrix (dECM) via appropriate decellularization protocols. The resultant dECM was dissolved in an acid pepsin solution to form dECM hydrogels. The analysis encompassed evaluating the microstructure and rheological properties of dECM hydrogels and evaluated their biological properties, including in vitro cell viability, proliferation, migration, tube formation, odontogenic, and neurogenic differentiation. Gelatin methacrylate (GelMA) hydrogel served as the control. Subsequently, hydrogels were injected into treated dentin matrix tubes and transplanted subcutaneously into nude mice to regenerate dental pulp tissue in vivo. The results showed that dECM hydrogels exhibited exceptional injectability and responsiveness to physiological temperature. It supported the survival, odontogenic, and neurogenic differentiation of dental pulp stem cells in a 3D culture setting. Moreover, it exhibited a superior ability to promote cell migration and angiogenesis compared to GelMA hydrogel in vitro. Additionally, the dECM hydrogel demonstrated the capability to regenerate pulp-like tissue with abundant blood vessels and a fully formed odontoblast-like cell layer in vivo. These findings highlight the potential of porcine dental pulp dECM hydrogel as a specialized scaffold material for dental pulp regeneration.


Assuntos
Matriz Extracelular Descelularizada , Hidrogéis , Camundongos , Animais , Suínos , Hidrogéis/farmacologia , Hidrogéis/química , Polpa Dentária , Camundongos Nus , Regeneração , Tecidos Suporte/química , Engenharia Tecidual/métodos , Matriz Extracelular
5.
PeerJ ; 11: e15641, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37397007

RESUMO

Background: MicroRNA-154-5p (miR-154-5p) plays a role in tumorigenesis in diverse human malignancies. Nevertheless, little is known about the mechanism by which miR-154-5p alters the growth and metastasis of cervical cancer. This research aimed to analyze the role of miR-154-5p in the pathology of cervical cancer in vitro and in vivo. Methods: The level of miR-154-5p in human papillomavirus 16 positive cervical cancer cells was examined by real-time quantitative polymerase chain reaction. Bioinformatics predicted the downstream targets and potential functions of miR-154-5p. Furthermore, lentiviral technology was used to construct SiHa cell lines with stable up- and down-expression levels of miR-154-5p. Its differential expression effects on the progress and metastasis of cervical cancer were analyzed using cell culture and animal models. Results: MiR-154-5p showed low expression in cervical cancer cells. Overexpression of miR-154-5p could markedly inhibit the proliferation, migration, and colony formation ability of SiHa cells, concomitantly leading to G1 arrest of the cell cycle, while silencing miR-154-5p triggered the opposite results. Meanwhile, overexpression of miR-154-5p restrained the growth and metastasis of cervical cancer by silencing CUL2 in vivo. Additionally, miR-154-5p reduced CUL2 level, and overexpression of CUL2 influenced the effect of miR-154-5p in cervical cancer. In conclusion, miR-154-5p restrained the growth and metastasis of cervical cancer by directly silencing CUL2.


Assuntos
Proteínas Culina , MicroRNAs , Neoplasias do Colo do Útero , Animais , Feminino , Humanos , Linhagem Celular Tumoral , Movimento Celular/genética , Proliferação de Células/genética , MicroRNAs/genética , Neoplasias do Colo do Útero/genética , Proteínas Culina/genética , Inativação Gênica , Metástase Neoplásica
6.
BMC Cancer ; 23(1): 222, 2023 Mar 09.
Artigo em Inglês | MEDLINE | ID: mdl-36894874

RESUMO

BACKGROUND: Our previous studies have confirmed that miR-154-5p can regulate pRb expression, and thus, play a tumor suppressor role in HPV16 E7-induced cervical cancer. However, its upstream molecules have not been elucidated in the progression of cervical cancer. This study aimed to explore the role of the miR-154-5p upstream molecule, hsa_circ_0000276 in cervical cancer development and its possible mechanisms of action. METHODS: We detected differences in whole transcriptome expression profiles of cervical squamous carcinoma and tissues adjacent to cervical cancer tissues from patients using microarray technology to predict circular RNAs (circRNAs) with binding sites to miR-154-5p. Quantitative reverse transcription polymerase chain reaction (qRT-PCR) was used to detect the expression of hsa_circ_0000276 (which had the strongest binding capacity to miR-154 and was selected as the target molecule) in cervical cancer tissues, followed by in vitro functional assays. Downstream microRNAs (miRNAs) and mRNAs of hsa_circ_0000276 were identified using transcriptome microarray data and databases, while the protein-protein interaction networks were obtained using STRING. A competing endogenous RNA (ceRNA) network centered on hsa_circ_0000276 was constructed using Cytoscape and GO and KEGG databases. Abnormal expression and prognosis of critical downstream molecules were analyzed using gene databases and molecular experiments. qRT-PCR and western blot analysis was performed to verify the expression of candidate genes. RESULTS: We identified 4,001 differentially expressed circRNAs between HPV16-positive cervical squamous carcinoma and benign cervical tissues and 760 circRNAs targeting miR-154-5p, including hsa_circ_0000276. hsa_circ_0000276 and miR-154-5p directly bound, and hsa_circ_0000276 was upregulated, in cervical precancerous lesions and cervical cancer tissues and cells. Silencing hsa_circ_0000276 inhibited G1/S transition and cell proliferation and promoted apoptosis in SiHa and CaSki cells. Bioinformatics analysis showed that the hsa_circ_0000276 ceRNA network included 17 miRNAs and seven mRNAs, and downstream molecules of hsa_circ_0000276 were upregulated in cervical cancer tissues. These downstream molecules were associated with a poor prognosis and affected cervical cancer-associated immune infiltration. Of these, expression of CD47, LDHA, PDIA3, and SLC16A1 was downregulated in sh_hsa_circ_0000276 cells. CONCLUSIONS: Our findings show that hsa_circ_0000276 exerts cancer-promoting effects in cervical cancer and is an underlying biomarker for cervical squamous cell carcinoma.


Assuntos
Carcinoma de Células Escamosas , MicroRNAs , Neoplasias do Colo do Útero , Feminino , Humanos , RNA Circular/genética , RNA Circular/metabolismo , Neoplasias do Colo do Útero/genética , MicroRNAs/genética , MicroRNAs/metabolismo , RNA Mensageiro/metabolismo , Carcinoma de Células Escamosas/patologia
7.
Int J Mol Sci ; 24(2)2023 Jan 04.
Artigo em Inglês | MEDLINE | ID: mdl-36674487

RESUMO

Due to their multi-differentiation potential, periodontal ligament fibroblasts (PDLF) play pivotal roles in periodontal tissue regeneration in vivo. Several in vitro studies have suggested that PDLFs can transmit mechanical stress into favorable basic cellular functions. However, the application of mechanical force for periodontal regeneration therapy is not expected to exhibit an effective prognosis since mechanical forces, such as traumatic occlusion, also exacerbate periodontal tissue degeneration and loss. Herein, we established a standardized murine periodontal regeneration model and evaluated the regeneration process associated with cementum remodeling. By administering a kinase inhibitor of YAP/TAZ suppressor molecules, such as large tumor suppressor homolog 1/2 (LATS1/2), we found that the activation of YAP/TAZ, a key downstream effector of mechanical signals, accelerated periodontal tissue regeneration due to the activation of PDLF cell proliferation. Mechanistically, among six kinds of MAP4Ks previously reported as upstream kinases that suppressed YAP/TAZ transcriptional activity through LATS1/2 in various types of cells, MAP4K4 was identified as the predominant MAP4K in PDLF and contributed to cell proliferation and differentiation depending on its kinase activity. Ultimately, pharmacological activation of YAP/TAZ by inhibiting upstream inhibitory kinase in PDLFs is a valuable strategy for improving the clinical outcomes of periodontal regeneration therapies.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal , Proteínas de Ciclo Celular , Camundongos , Animais , Proteínas de Ciclo Celular/genética , Proteínas de Ciclo Celular/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Modelos Animais de Doenças , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Proteínas de Sinalização YAP , Proteínas Serina-Treonina Quinases/metabolismo
8.
Int J Neurosci ; 133(9): 1031-1044, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-35579409

RESUMO

Multiple sclerosis (MS) was once considered an untreatable disease. Through years of research, many drugs have been discovered and are widely used for the treatment of MS. However, the current treatment can only alleviate the clinical symptoms of MS and has serious side effects. Mesenchymal stem cells (MSCs) provide neuroprotection by migrating to injured tissues, suppressing inflammation, and fostering neuronal repair. Therefore, MSCs therapy holds great promise for MS treatment. This review aimed to assess the feasibility and safety of use of MSCs in MS treatment as well as its development prospect in clinical treatment by analysing the existing clinical studies.


Assuntos
Transplante de Células-Tronco Mesenquimais , Células-Tronco Mesenquimais , Esclerose Múltipla , Humanos , Esclerose Múltipla/terapia , Esclerose Múltipla/etiologia , Transplante de Células-Tronco Mesenquimais/métodos , Células-Tronco Mesenquimais/fisiologia , Neuroproteção
10.
Adv Sci (Weinh) ; 10(5): e2205041, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-36516309

RESUMO

Poor fiber orientation and mismatched bone-ligament interface fusion have plagued the regeneration of periodontal defects by cell-based scaffolds. A 3D bioprinted biomimetic periodontal module is designed with high architectural integrity using a methacrylate gelatin/decellularized extracellular matrix (GelMA/dECM) cell-laden bioink. The module presents favorable mechanical properties and orientation guidance by high-precision topographical cues and provides a biochemical environment conducive to regulating encapsulated cell behavior. The dECM features robust immunomodulatory activity, reducing the release of proinflammatory factors by M1 macrophages and decreasing local inflammation in Sprague Dawley rats. In a clinically relevant critical-size periodontal defect model, the bioprinted module significantly enhances the regeneration of hybrid periodontal tissues in beagles, especially the anchoring structures of the bone-ligament interface, well-aligned periodontal fibers, and highly mineralized alveolar bone. This demonstrates the effectiveness and feasibility of 3D bioprinting combined with a dental follicle-specific dECM bioink for periodontium regeneration, providing new avenues for future clinical practice.


Assuntos
Matriz Extracelular Descelularizada , Tecidos Suporte , Cães , Ratos , Animais , Tecidos Suporte/química , Matriz Extracelular/química , Ratos Sprague-Dawley , Gelatina
11.
Stem Cell Res Ther ; 13(1): 536, 2022 12 27.
Artigo em Inglês | MEDLINE | ID: mdl-36575471

RESUMO

BACKGROUND: Periodontitis often causes irrevocable destruction of tooth-supporting tissues and eventually leads to tooth loss. Currently, stem cell-based tissue engineering has achieved a favorable result in regenerating periodontal tissues. Moreover, cell-free therapies that aim to facilitate the recruitment of resident repair cell populations to injured sites by promoting cell mobilization and homing have become alternative options to cell therapy. MAIN TEXT: Cell aggregates (e.g., cell sheets) retain a large amount of extracellular matrix which can improve cell viability and survival rates after implantation in vivo. Electrostatic spinning and 3D bioprinting through fabricating specific alignments and interactions scaffold structures have made promising outcomes in the construction of a microenvironment conducive to periodontal regeneration. Cell-free therapies with adding biological agents (growth factors, exosomes and conditioned media) to promote endogenous regeneration have somewhat addressed the limitations of cell therapy. CONCLUSION: Hence, this article reviews the progress of stem cell-based tissue engineering and advanced strategies for endogenous regeneration based on stem cell derivatives in periodontal regeneration.


Assuntos
Periodontite , Periodonto , Humanos , Periodontite/metabolismo , Engenharia Tecidual , Células-Tronco/metabolismo , Terapia Baseada em Transplante de Células e Tecidos , Ligamento Periodontal
12.
Sci Rep ; 12(1): 21865, 2022 12 18.
Artigo em Inglês | MEDLINE | ID: mdl-36529787

RESUMO

Accurately model recognition of mobile device is of great significance for identifying copycat device and protecting intellectual property rights. Although existing methods have realized high-accuracy recognition about device's category and brand, the accuracy of model recognition still needs to be improved. For that, we propose Recognizer, a high-accuracy model recognition method of mobile device based on weighted feature similarity. We extract 20 features from the network traffic and physical attributes of device, and design feature similarity metric rules, and calculate inter-device similarity further. In addition, we propose feature importance evaluation strategies to assess the role of feature in recognition and determine the weight of each feature. Finally, based on all or part of 20 features, the similarity between the target device and known devices is calculated to recognize the brand and model of target device. Based on 587 models of mobile devices of 17 widely used brands such as Apple and Samsung, we carry out device recognition experiments. The results show that Recognizer can identify the device's brand and model than existing methods more effectively. In average, the model recognition accuracy of Recognizer is 99.08% (+ 9.25%↑) when using 20 features and 92.08% (+ 29.26%↑) when using 13 features.


Assuntos
Computadores de Mão , Reconhecimento Psicológico
13.
ACS Appl Mater Interfaces ; 14(46): 51931-51940, 2022 Nov 23.
Artigo em Inglês | MEDLINE | ID: mdl-36373960

RESUMO

Lithium metal batteries (LMBs) are regarded as one of the most promising next-generation energy storage devices due to their high energy density. However, the conversion of LMBs from laboratory to factory is hindered by the formation of lithium dendrites and volume change during lithium stripping and deposition processes. In this work, a volume-responsive separator with core/shell structure thermoplastic polyurethane (TPU)/polyvinylidene fluoride (PVDF) fibers and SiO2 coating layers is designed to restrict dendrite growth. The TPU/PVDF-SiO2 separator can accommodate the volume change like an artificial lung and keep intimate contact with the electrodes, which leads to the formation of a uniform and high-density solid-electrolyte interphase. Meanwhile, the separator can regulate the transport channels and diffusion coefficients (D) of lithium ions with the change of porosity from both experimental and ab initio molecular dynamic analysis. The Li symmetric cells assembled with the TPU/PVDF-SiO2 can run for 1000 h at the current of 1.0 mA cm-2 without a short circuit. Moreover, the low melting point of PVDF can shut the ionic conduction down at 170 °C, guaranteeing the thermal safety of the batteries. With the above advantages, the TPU/PVDF-SiO2 separator presents great potential to promote the commercial and industrial application of LMBs.

14.
Expert Rev Clin Immunol ; 18(10): 1083-1090, 2022 10.
Artigo em Inglês | MEDLINE | ID: mdl-35998365

RESUMO

BACKGROUND: Epidemiological studies about the association between genetic polymorphisms in TNFA, TNFB, and IFNG and the risk for multiple sclerosis (MS) have been performed extensively. However, the results are inconclusive. The purpose of this meta-analysis was to evaluate the contribution of the polymorphisms in TNFA, TNFB, and IFNG to the susceptibility of MS. METHODS: The PubMed, Web of Science, and China National Knowledge Infrastructure databases were searched to identify relevant studies up to October 2021. A meta-analysis was performed, and pooled odds ratios (OR) and confidence intervals (CI) were computed using fixed or random effects models. RESULTS: A marginally significant association of the IFNG +874AT genotype with high risk of MS was observed in a heterozygous comparison (OR = 1.51, 95% CI, 1.02-2.23). However, no significant association between the TNFA (-308 G/A, - 238 G/A, and - 376 G/A) and TNFB +252A/G polymorphisms and MS risk was observed both in overall analysis and in subgroup analysis. CONCLUSION: This meta-analysis provides evidence that the TNFA (-308 G/A, - 238 G/A, and - 376 G/A) and TNFB +252A/G polymorphisms were not risk factors for the occurrence of MS. Further studies with larger samples are necessary to reach the concise results about the contribution of other polymorphisms to the risk of MS.


Assuntos
Linfotoxina-alfa/genética , Esclerose Múltipla , Fator de Necrose Tumoral alfa/genética , Predisposição Genética para Doença , Genótipo , Humanos , Esclerose Múltipla/genética , Razão de Chances , Polimorfismo Genético , Polimorfismo de Nucleotídeo Único
15.
Artigo em Inglês | MEDLINE | ID: mdl-35954613

RESUMO

Unsustainable production and consumption have threatened human life and nature. Therefore, practitioners around the globe have paid attention to sustainability issues and adopted pro-environmental strategies to protect the environment. Using single-use cups contributes to environmental pollution. This study aims to understand university students' intention to use reusable drink cups in university campuses. This study has extended the theory of planned behavior (TPB) model by including moral norms, green university initiatives, environmental concerns, and moral norms. The purposive sampling technique has been employed to collect students' data from the twelve universities in Pakistan. Partial least square structural equation modeling (PLS-SEM) has been employed to test the hypothesized model. The study's results revealed that green university initiatives and norms significantly shape students' intention to use reusable cups. However, environmental concern has an insignificant impact on the perceived behavioral control. This study's results help higher education institutions to formulate strategies that create awareness among students and promote environmentally sustainable practices.


Assuntos
Atitude , Intenção , Controle Comportamental , Humanos , Estudantes , Inquéritos e Questionários , Universidades
16.
Artigo em Inglês | MEDLINE | ID: mdl-35897311

RESUMO

Employee turnover is expensive and disruptive for an organization. Studies have already mentioned that the economic cost of turnover is huge, ranging from 90% to 200% of the existing employee's salary. With an increase in turnover rate, the social fabric of an enterprise may be disrupted. Additionally, organizations with an increasing turnover are expected to lose intangible knowledge and skills, operational effectiveness, customer satisfaction, and product or service quality. In a healthcare context, an increasing turnover rate has more consequences than other sectors because the healthcare sector worldwide is already identified as a sector facing resource scarcity. Exacerbating the situation, current evidence suggests that employee turnover has been increasing globally in the healthcare sector. The literature suggests that an ethical leadership style may reduce employees' likelihood of quitting an organization. However, such literature is sparse in healthcare, especially from the perspective of a developing economy in the Global South, which is more resource-deficient than the Global North. To fill this knowledge gap, this study investigates the relationship between ethical leadership style and turnover intentions in the healthcare context of the Global South. This study also tests the mediating effect of intrinsic motivation and psychological contract fulfillment in the above-proposed relationship. Furthermore, the conditional indirect effect of resilience is also tested. The data are collected from the hospital employees through a self-administered questionnaire. The hypothesized relationships are tested through structural equation modeling. The empirical evidence indicates that ethical leadership reduces employees' turnover intentions significantly. The results further confirm the mediating and moderating effects of intrinsic motivation, psychological contract fulfillment, and resilience. These results have different theoretical and practical implications for the healthcare sector. The results especially highlight the role of ethical leaders in a hospital to deal with the challenge of turnover, which has been rising worldwide.


Assuntos
Liderança , Reorganização de Recursos Humanos , Setor de Assistência à Saúde , Humanos , Intenção , Princípios Morais
17.
Pharmaceuticals (Basel) ; 15(5)2022 Apr 27.
Artigo em Inglês | MEDLINE | ID: mdl-35631369

RESUMO

Legumain has been found overexpressed in several cancers, which serves as an important biomarker for cancer diagnosis. In this research, a novel fluorine-18 labeled radioactive tracer [18F]SF-AAN targeting legumain was designed and synthesized for positron emission tomography (PET) imaging. Nonradioactive probe [19F]SF-AAN was obtained through chemical and solid phase peptide synthesis. After a simple one-step 18F labeling, the radiotracer [18F]SF-AAN was obtained with a high radiochemical conversion rate (>85%) and radiochemical purity (99%) as well as high molar activity (12.77 ± 0.50 MBq/nmol). The targeting specificity of [18F]SF-AAN for detecting legumain activity was investigated systematically in vitro and in vivo. In vitro cellular uptake assay showed that the uptake of [18F]SF-AAN in legumain-positive MDA-MB-468 cells was twice as much as that in legumain-negative PC-3 cells at 4 h. In vivo PET imaging revealed that the tumor uptake of [18F]SF-AAN in MDA-MB-468 tumor-bearing mice was about 2.7 times of that in PC-3 tumor-bearing mice at 10 min post injection. The experimental results indicated that [18F]SF-AAN could serve as a promising PET tracer for detecting the legumain expression sensitively and specifically, which would be beneficial for the diagnosis of legumain-related diseases.

18.
Appl Opt ; 61(11): 3247-3253, 2022 Apr 10.
Artigo em Inglês | MEDLINE | ID: mdl-35471304

RESUMO

This paper proposes a no-core-single-mode-no-core Mach-Zehnder fiber sensor. In this sensor, two no-core fibers serve as input and output couplers, and the middle single-mode fiber serves as a sensing arm. Using finite element simulation and theoretical analysis, the optimal length of the couplers and the sensing arm are determined. High-order modes excited by no-core optical fiber propagate through the cladding of the single-mode fiber, which is affected by the ambient temperature and applied force. The trough of different interference orders of the transmission spectrum is selected as a research object to realize the measurement of curvature and temperature, strain and temperature with the sensing matrix.

19.
J Am Chem Soc ; 144(17): 7667-7675, 2022 05 04.
Artigo em Inglês | MEDLINE | ID: mdl-35452229

RESUMO

Target-enabled bioorthogonal reaction and self-assembly of a small-molecule probe into supramolecules have shown promise for molecular imaging. In this paper, we report a new stimuli-responsive bioorthogonal reaction scaffold (SF) for controlling in situ self-assembly by engineering the condensation reaction between 2-cyanobenzothiazole and cysteine. For probes with the SF scaffold, intramolecular cyclization took place soon after activation, which could efficiently outcompete free cysteine even at a low concentration and result in efficient aggregation in the target. Through integration with different enzyme-responsive substrates and an ammoniomethyl-trifluoroborate moiety (AmBF3), two radioactive positron emission tomography (PET) tracers, [18F]SF-DEVD and [18F]SF-Glu, were designed, which showed high stability under physiological conditions and could produce clear PET signal in tumors to detect enzyme activity (e.g., caspase-3, γ-glutamyltranspeptidase) timely and accurately. Our results demonstrated that the scaffold SF could serve as a general molecular scaffold in the development of smart PET tracers for noninvasive imaging of enzyme activity, which could contribute to tumor detection and treatment efficacy evaluation.


Assuntos
Radioisótopos de Flúor , Traçadores Radioativos , Cisteína , Radioisótopos de Flúor/química , Tomografia por Emissão de Pósitrons/métodos , Compostos Radiofarmacêuticos/química
20.
Front Psychol ; 13: 686373, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35369243

RESUMO

None of the studies published in the extant literature has discussed the role of green innovation climate and green autonomy concerning green creativity and this study aims to offer these two novel constructs. By introducing the componential theory of creativity, this study explores green transformational leadership (GTL), green innovation climate, and green autonomy as antecedents of green creativity. The authors employed structural equation modeling (SEM) to analyze survey-based data collected from automotive firms in China. Data were collected from employee-supervisor working in the automotive industry located in Liaoning province, China. The findings reveal that GTL directly and indirectly via green innovation climate partially mediates the green creativity of employees in China. Moreover, green autonomy moderates the relationship between green innovation climate and green creativity. This pivotal contribution suggests that automotive business enterprises should develop GTL to nurture a green innovation climate and offer green autonomy for the green creativity of employees. The above antecedents of green creativity may enable business firms to gain a competitive advantage by innovating green products and practices.

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