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1.
Int J Mol Sci ; 25(1)2023 Dec 22.
Artigo em Inglês | MEDLINE | ID: mdl-38203367

RESUMO

The major histocompatibility complexes of vertebrates play a key role in the immune response. Antigen-presenting cells are loaded on MHC I molecules, which mainly present endogenous antigens; when MHC I presents exogenous antigens, this is called cross-presentation. The discovery of cross-presentation provides an important theoretical basis for the study of exogenous antigens. Cross-presentation is a complex process in which MHC I molecules present antigens to the cell surface to activate CD8+ T lymphocytes. The process of cross-representation includes many components, and this article briefly outlines the origins and development of MHC molecules, gene structures, functions, and their classical presentation pathways. The cross-presentation pathways of MHC I molecules, the cell lines that support cross-presentation, and the mechanisms of MHC I molecular transporting are all reviewed. After more than 40 years of research, the specific mechanism of cross-presentation is still unclear. In this paper, we summarize cross-presentation and anticipate the research and development prospects for cross-presentation.


Assuntos
Apresentação Cruzada , Antígenos de Histocompatibilidade , Animais , Complexo Principal de Histocompatibilidade , Células Apresentadoras de Antígenos , Antígenos de Histocompatibilidade Classe I
2.
Int J Mol Sci ; 24(23)2023 Dec 02.
Artigo em Inglês | MEDLINE | ID: mdl-38069380

RESUMO

Ongoing research is gradually broadening the idea of cancer treatment, with attention being focused on nanoparticles to improve the stability, therapeutic efficacy, targeting, and other important metrics of conventional drugs and traditional drug delivery methods. Studies have demonstrated that drug delivery carriers based on biomaterials (e.g., protein nanoparticles and lipids) and inorganic materials (e.g., metal nanoparticles) have potential anticancer effects. Among these carriers, self-assembled proteins and peptides, which are highly biocompatible and easy to standardize and produce, are strong candidates for the preparation of anticancer drugs. Breast cancer (BC) and cervical cancer (CC) are two of the most common and deadly cancers in women. These cancers not only threaten lives globally but also put a heavy burden on the healthcare system. Despite advances in medical care, the incidence of these two cancers, particularly CC, which is almost entirely preventable, continues to rise, and the mortality rate remains steady. Therefore, there is still a need for in-depth research on these two cancers to develop more targeted, efficacious, and safe therapies. This paper reviews the types of self-assembling proteins and peptides (e.g., ferritin, albumin, and virus-like particles) and natural products (e.g., soy and paclitaxel) commonly used in the treatment of BC and CC and describes the types of drugs that can be delivered using self-assembling proteins and peptides as carriers (e.g., siRNAs, DNA, plasmids, and mRNAs). The mechanisms (including self-assembly) by which the natural products act on CC and BC are discussed. The mechanism of action of natural products on CC and BC and the mechanism of action of self-assembled proteins and peptides have many similarities (e.g., NF-KB and Wnt). Thus, natural products using self-assembled proteins and peptides as carriers show potential for the treatment of BC and CC.


Assuntos
Produtos Biológicos , Neoplasias da Mama , Nanopartículas , Neoplasias do Colo do Útero , Feminino , Humanos , Neoplasias da Mama/tratamento farmacológico , Neoplasias do Colo do Útero/tratamento farmacológico , Peptídeos/uso terapêutico , Peptídeos/farmacologia , Proteínas/uso terapêutico , Sistemas de Liberação de Medicamentos/métodos , Portadores de Fármacos/uso terapêutico , Nanopartículas/uso terapêutico , Produtos Biológicos/uso terapêutico
3.
Phys Chem Chem Phys ; 24(6): 3875-3885, 2022 Feb 09.
Artigo em Inglês | MEDLINE | ID: mdl-35088774

RESUMO

Based on MoC2 nanoribbons and poly-(terphenylene-butadiynylene) (PTB) molecules, we designed MoC2-PTB molecular spintronic devices and investigated their spin-dependent electron transport properties by using spin-polarized density functional theory and the non-equilibrium Green's function method. As a typical MXene material, it is found that the magnetic contribution of MoC2 nanoribbons mainly comes from the delocalized 3d electron of edge Mo atoms. Owing to the obvious spin-splitting near the Fermi level of the MoC2 nanoribbon electrode, the spin states can be effectively injected into the central scattering region under an external bias voltage. In addition, we also studied the effects of z-axis strain on the spin transport properties of the PTB molecular device, where the strain was controlled within the range of -9% to 9%. Under a compressed strain, spin current increases obviously, and the spin-filtering efficiency (SFE) decreases slightly. Nevertheless, under a tensile strain, we found that the SFE increases but spin current decreases. Moreover, z-axis strain can induce a negative differential resistance (NDR) effect at a high bias point. This work would expand the potential applications of new two-dimensional (2D) materials in the field of molecular spintronic devices.

4.
Int J Mol Sci ; 23(17)2022 Sep 04.
Artigo em Inglês | MEDLINE | ID: mdl-36077522

RESUMO

Mangiferin (MF), a xanthone that extensively exists in many herbal medicines, processes significant activities of anti-inflammation and immunomodulation. The potential regulatory effect and mechanism of mangiferin on cell pyroptosis remain unclear. In this study, mouse bone-marrow-derived macrophages (BMDMs) were stimulated with 1 µg/mL LPS to induce cell pyroptosis and were treated with 10, 50, or 100 µg/mL MF for regulating pyroptosis. The cell supernatants TNF-α, IL-1ß, IL-6, and IL-18 were detected by enzyme-linked immunosorbent assay (ELISA); gene expression of TNF-α, IL-1ß, IL-6, IL-18, Caspase-1, Caspase-11, and gasdermin D (GSDMD) was tested by real-time polymerase chain reaction (RT-PCR), and protein expression levels of apoptosis-associated speck-like protein containing a caspase-recruitment domain (ASC), nod-like receptor protein-3 (NLRP3), caspase-1, caspase-11, GSDMD, and NF-κB were detected by Western blot. The results showed that MF significantly inhibited the secretion and gene expression of TNF-α, IL-6, IL-1ß, and IL-18 that were elevated by LPS. Moreover, MF significantly suppressed the gene expression of Caspase-1, Caspase-11, and GSDMD, and decreased the protein levels of NLRP3, caspase-1, caspase-11, full-length GSDMD (GSDMD-FL), GSDMD N-terminal (GSDMD-N), and NF-κB. In conclusion, mangiferin has a multi-target regulating effect on inflammation and pyroptosis by inhibiting the NF-κB pathway, suppressing inflammatory caspase-mediated pyroptosis cascades, and reducing GSDMD cleavage in LPS-induced BMDMs.


Assuntos
Proteína 3 que Contém Domínio de Pirina da Família NLR , Xantonas , Animais , Anti-Inflamatórios/farmacologia , Caspase 1/metabolismo , Caspases , Inflamassomos/metabolismo , Interleucina-18 , Interleucina-6 , Lipopolissacarídeos/farmacologia , Camundongos , NF-kappa B/metabolismo , Proteína 3 que Contém Domínio de Pirina da Família NLR/metabolismo , Proteínas NLR , Fator de Necrose Tumoral alfa , Xantonas/farmacologia
5.
Int J Mol Sci ; 23(24)2022 Dec 17.
Artigo em Inglês | MEDLINE | ID: mdl-36555757

RESUMO

Pyroptosis is an active and ordered form of programmed cell death. The signaling pathways of pyroptosis are mainly divided into canonical pathways mediated by caspase-1 and noncanonical pathways mediated by caspase-11. Cell pyroptosis is characterized by the activation of inflammatory caspases (mainly caspase-1, 4, 5, 11) and cleavage of various members of the Gasdermin family to form membrane perforation components, leading to cell membrane rupture, inflammatory mediators release, and cell death. Moderate pyroptosis is an innate immune response that fights against infection and plays an important role in the occurrence and development of the normal function of the immune system. However, excessive pyroptosis occurs and leads to immune disorders in many pathological conditions. Based on canonical pathways, research on pyroptosis regulation has demonstrated several pyroptotic inhibitors, including small-molecule drugs, natural products, and formulations of traditional Chinese medicines. In this paper, we review the characteristics and molecular mechanisms of pyroptosis, summarize inhibitors of pyroptosis, and propound that herbal medicines should be a focus on the research and development for pyroptosis blockers.


Assuntos
Inflamassomos , Piroptose , Inflamassomos/metabolismo , Apoptose , Caspases/metabolismo , Imunidade Inata , Caspase 1/metabolismo
6.
Zhonghua Nan Ke Xue ; 28(3): 211-216, 2022 Mar.
Artigo em Chinês | MEDLINE | ID: mdl-37462958

RESUMO

OBJECTIVE: To investigate the expression of glucocorticoid receptor (GR) in the PCa tissue and its correlation with the clinicopathological characteristics and prognosis of PCa. METHODS: Using immunohistochemical staining, we determined the expression of GR in the PCa tissue and analyzed its correlation with the clininicopathological features and prognosis of the malignancy. RESULTS: The positive expression of GR in the PCa tissue was 64%, of which the strongly positive rate was 34.7%. The GR expression was positively correlated with preoperative androgen-deprivation therapy (ADT) (χ2 = 22.307, P < 0.01), Gleason grades (χ2 = 16.534, P = 0.002) and clinical stages of the tumor (χ2 = 9.969, P = 0.041). Kaplan-Meier analysis showed that the GR expression was correlated not with the overall survival (P = 0.156), but with the PSA progression-free survival rate of the PCa patients (P = 0.042), with a shorter PSA progression-free survival time in those with a higher GR expression. Multivariate COX regression analysis revealed that the expression of GR was not an independent prognostic factor for PSA progression-free survival of the PCa patients. CONCLUSION: The expression of GR is related with preoperative ADT, and closely with the biological behavior of the malignancy and treatment resistance of the patients. GR is expected to be a new effective therapeutic target and a prognostic biomarker for PCa.


Assuntos
Neoplasias da Próstata , Masculino , Humanos , Neoplasias da Próstata/patologia , Antígeno Prostático Específico , Receptores de Glucocorticoides/uso terapêutico , Antagonistas de Androgênios/uso terapêutico , Relevância Clínica , Prognóstico
7.
J Cell Biochem ; 2020 Jan 06.
Artigo em Inglês | MEDLINE | ID: mdl-31904141

RESUMO

As a specific inhibitor of serine/threonine protein phosphatases, okadaic acid (OA) has been found to be a tumor promoter. However, whether OA plays a role in metastasis of hepatocellular carcinoma (HCC) has not been well elucidated. In this study, Hep3B and HepG2 cells were treated with different doses of OA and the cell viability was determined by CCK8 test. As a result, Hep3B and HepG2 cells showed no obvious cytotoxicity after OA treatment below 20 or 25 nM for 12 or 24 hours. However, wound healing, invasion, and migration abilities of HCC cells were significantly enhanced in the OA-treated groups than those of the control group (P < .05), measured by cell scratching and BD transwell assays. Moreover, we found that the expression of epithelial-mesenchymal transition (EMT)-related key factors was changed upon OA treatment in a dose-dependent manner. In addition, the activity of protein phosphatase 2A (PP2A) in OA-treated cells was also decreased significantly compared with the control cells (P < .05). Interfering of PP2A subunit A or C caused a similar expression change of EMT-related key factors as the OA treatment in HCC cells. Our results suggest that OA promotes the EMT process of HCC cells by inhibiting the activity of PP2A.

9.
J Dairy Sci ; 103(1): 840-845, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31733844

RESUMO

This study investigated the antimicrobial susceptibility of methicillin-resistant Staphylococcus aureus (MRSA) isolated from cases of subclinical bovine mastitis in China, as well as resistance mechanisms and virulence genes encoding adhesins and toxins. We determined antimicrobial susceptibility using the disk diffusion method, and analyzed resistance, adhesin, and toxin genes using PCR. We confirmed MRSA in 73 of 498 (14.7%) Staph. aureus isolates recovered from subclinical mastitic milk samples. All isolates were positive for mecA. The MRSA isolates showed high resistance to penicillin (100.0%), gentamicin (100.0%), and tetracycline (98.6%). All MRSA isolates harbored resistance genes blaZ (penicillin), aacA/aphD (gentamicin), and tetM (alone or in combination with tetK, tetracycline). Moreover, all isolates carried the adhesin genes fnbpA, clfA, clfB, cna, sdrE, and map/eap, and most carried sdrC (98.6%), sdrD (95.9%), bbp (94.5%), and ebpS (80.8%). The toxin genes seh, hla, and hld were present in all isolates, and most isolates carried sea (71.2%), seg (84.9%), sei (82.2%), lukE-lukD (97.3%), and hlg (72.6%). These findings of high-level resistance to antimicrobials commonly used in dairy cattle should lead to calls for antibiogram analysis before antimicrobial therapy. The high frequency of adhesin and toxin genes in MRSA indicates their potential virulence in bovine mastitis in China.


Assuntos
Mastite Bovina/microbiologia , Staphylococcus aureus Resistente à Meticilina/isolamento & purificação , Infecções Estafilocócicas/veterinária , Adesinas Bacterianas/genética , Animais , Antibacterianos/farmacologia , Bovinos , China , Feminino , Gentamicinas/farmacologia , Mastite Bovina/tratamento farmacológico , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Staphylococcus aureus Resistente à Meticilina/genética , Staphylococcus aureus Resistente à Meticilina/patogenicidade , Testes de Sensibilidade Microbiana , Reação em Cadeia da Polimerase/veterinária , Infecções Estafilocócicas/microbiologia , Tetraciclina/farmacologia , Virulência/genética
10.
Cancer Cell Int ; 19: 340, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31889893

RESUMO

Background: Hepatocellular carcinoma (HCC) is one of the most common malignancies worldwide, especially in China, with high metastasis and poor prognosis. Recently, as the core component of the polycomb repressive complexes 1 (PRC1), chromobox protein homolog 8 (CBX8) is considered as an oncogene and prognostic marker in HCC. Methods: A tissue microarray of 166 paired HCC and adjacent non-tumor samples were collected to identify the relationship between CBX8 and epithelial mesenchymal transition (EMT) associated proteins by Spearman correlation analysis. Knock-down of CBX8 in HCC cells was conducted to detect the biologic functions of CBX8 in HCC metastasis. Results: We found out that CBX8 was over-expressed in HCC and its expression was closely related to the metastasis of HCC patients. In addition, knock-down of CBX8 was found to inhibit the invasion and migration ability of HCC cells. Moreover, there was a significant relationship between expression of CBX8 and EMT associated proteins both in HCC cells and tumor tissues. Conclusions: Our results indicate that CBX8 promotes metastasis of HCC by inducing EMT process.

11.
J Dairy Sci ; 102(1): 140-144, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30415850

RESUMO

This study aimed to investigate the antimicrobial resistance and virulence genes of Enterococcus faecalis isolated from subclinical bovine mastitis cases in China. Enterococcus faecalis isolates were identified by 16S rRNA amplification and sequencing. Antimicrobial susceptibility was determined by the disc diffusion method. Antimicrobial resistance and virulence genes were tested by PCR. Overall, E. faecalis was recovered from 81 of 1,787 (4.5%) mastitic milk samples. The isolates showed high resistance against tetracycline (87.7%) and erythromycin (79.0%). The most prevalent resistance genes found in the E. faecalis were tetK (96.3%), tetL (79.0%), and tetM (87.7%) for tetracycline and ermC (97.5%) for erythromycin. Moreover, gelE (70.4%), esp (85.2%), efaA (91.4%) were the most common virulence genes. This is the first report to characterize E. faecalis recovered from subclinical bovine mastitis cases in China.


Assuntos
Farmacorresistência Bacteriana/genética , Enterococcus faecalis/genética , Enterococcus faecalis/isolamento & purificação , Mastite Bovina/microbiologia , Animais , Antibacterianos/farmacologia , Bovinos , China , Enterococcus faecalis/patogenicidade , Eritromicina/farmacologia , Feminino , Testes de Sensibilidade Microbiana , Reação em Cadeia da Polimerase , RNA Ribossômico 16S/análise , RNA Ribossômico 16S/química , Resistência a Tetraciclina/genética , Virulência/genética , Fatores de Virulência/genética
12.
J Dairy Sci ; 102(8): 6920-6922, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31178194

RESUMO

The present study investigated the effects of N-acetylcysteine (NAC) on ß-lactam antibacterial activity against 20 methicillin-resistant Staphylococcus aureus (MRSA) isolates from bovine mastitis. Minimum inhibitory concentrations (MIC) were determined by the E-test method. The presence of 10 mM NAC reduced the MIC of penicillin, ampicillin, oxacillin, cefoxitin, ceftazidime, and cefotaxime to MRSA. Importantly, the MIC of cefoxitin in MRSA in the presence of NAC was lower than the susceptible breakpoint of cefoxitin. The results provide a new way to use current ß-lactam antibiotics combined with NAC against MRSA.


Assuntos
Acetilcisteína/farmacologia , Antibacterianos/farmacologia , Mastite Bovina/microbiologia , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Staphylococcus aureus Resistente à Meticilina/isolamento & purificação , beta-Lactamas/farmacologia , Acetilcisteína/administração & dosagem , Ampicilina/farmacologia , Animais , Bovinos , Cefoxitina/farmacologia , Feminino , Testes de Sensibilidade Microbiana , Oxacilina/farmacologia , Penicilina G/farmacologia
13.
J Dairy Sci ; 101(7): 6244-6252, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29605334

RESUMO

Escherichia coli is the leading causative agent of bovine mastitis worldwide. Quinolone-resistant E. coli is becoming a potential threat to veterinary and public health. The aim of this study was to investigate the characteristics of quinolone-resistant E. coli isolated from bovine mastitis cases in China. Antimicrobial susceptibility of the isolates against 15 antimicrobial agents was determined by disc diffusion method. Phylogenetic grouping was detected by PCR. Extended-spectrum ß-lactamase-producing isolates were determined by double-disc synergy test. In addition, the plasmid-mediated quinolone resistance (PMQR) and ß-lactamase-encoding genes, as well as mutations of quinolone resistance-determining regions in GyrA, GyrB, ParC, and ParE, were measured by PCR and DNA sequencing. Overall, 75 (22.9%) out of 328 E. coli isolates were confirmed as ciprofloxacin-resistant from 2,954 mastitic milk samples. Phylogenetic group analysis showed that the majority of these strains belonged to phylogenetic group A (57.3%) and group B1 (24.0%). All the resistant isolates were identified as multidrug resistant, showing high resistance to cephalosporins and non-ß-lactams. Forty-nine (65.3%) of the quinolone-resistant isolates were positive for PMQR genes; aac-(6')-Ib-cr was the most common PMQR determinant detected in 33 (44.0%) isolates. Eighteen (24.0%), 4 (5.3%), 3 (4.0%), and 1 (1.3%) of the quinolone-resistant isolates were harboring oqxA/B, qepA4, qnrS, and qnrB2, respectively. Additionally, 55 (73.3%) of the quinolone-resistant E. coli isolates were found to be extended-spectrum ß-lactamase producers. The preponderant ß-lactamase-encoding gene, blaTEM, was detected in 44 (58.7%) isolates; blaCTX-M, blaCMY, and blaSHV were found in 35 (46.7%), 22 (29.3%), and 2 (2.7%) isolates, respectively. Moreover, the most frequently identified substitutions were S83L/D87N or S83L in GyrA, detected in all of the quinolone-resistant isolates. Meanwhile, 74 (98.7%), 33 (44.0%), and 6 (8.0%) of the isolates were carrying substitutions S80I in ParC, S458A in ParE, and S492N in GyrB, respectively. All 58 (77.3%) isolates with a high level of ciprofloxacin resistance (>32 µg/mL) carried single or double mutations in GyrA combined with single mutation in ParC. To the best of our knowledge, this is the first report on the high occurrence of PMQR determinants and quinolone-determining resistant regions mutations in quinolone-resistant E. coli isolated from bovine mastitis in China.


Assuntos
Antibacterianos/farmacologia , Infecções por Escherichia coli/tratamento farmacológico , Mastite Bovina/microbiologia , Quinolonas/farmacologia , Animais , Bovinos , Escherichia coli , Feminino , Mastite Bovina/tratamento farmacológico , Testes de Sensibilidade Microbiana/veterinária , Filogenia , Plasmídeos , beta-Lactamases
14.
J Dairy Sci ; 100(11): 9324-9337, 2017 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-28918157

RESUMO

Endometritis is an important disease of dairy cows that leads to significant economic losses in the dairy cattle industry. To investigate the alteration of proteins associated with endometritis in the dairy cow, the isobaric tags for relative and absolute quantification (iTRAQ) technique was applied to quantitatively identify differentially expressed proteins (DEP) in the endometrium and peripheral plasma of Chinese Holstein cows with endometritis. Compared with the normal (control) group, 159 DEP in the endometrium and 137 DEP in the plasma were identified in cows with endometritis. Gene ontology analysis demonstrated that the predominant endometrial DEP were primarily involved in responses to stimulus and stress processes and mainly played a role in hydrolysis in the extracellular region. The predominant plasma DEP were mainly components of the cytosol and non-membrane-bound organelles, and they were involved in the response to stress and regulation of enzyme activity. Protein-protein interaction of tissue DEP revealed that some core seed proteins, such as RAC2, ITGB2, and CDH1 in the same network as CD14, MMP3, and MMP9, had important functions in the cross-talk of pathways related to extracellular proteolysis. In summary, significant enzymatic hydrolase activity in the extracellular region is proposed as a molecular mechanism by which altered proteins may promote inflammation and hence endometritis.


Assuntos
Doenças dos Bovinos/metabolismo , Endometrite/veterinária , Endométrio/metabolismo , Proteômica , Animais , Bovinos , Doenças dos Bovinos/genética , Endometrite/metabolismo , Feminino , Perfilação da Expressão Gênica , Hidrólise
15.
J Org Chem ; 80(3): 1661-71, 2015 Feb 06.
Artigo em Inglês | MEDLINE | ID: mdl-25559095

RESUMO

The origin of stereodivergence between copper- and gold-catalyzed cascade 1,3-phosphatyloxy and 1,3-halogen migration from α-halo-propargylic phosphates to 1,3-dienes is rationalized with density functional theory (DFT) studies. Our studies reveal the significant role of the relative hardness/softness of the metal centers in determining the reaction mechanism and the stereoselectivity. The relative harder Cu(I/III) center prefers an associative pathway with the aid of a phosphate group, leading to the (Z)-1,3-dienes. In contrast, the relative softer Au(I/III) center tends to undergo a dissociative pathway without coordination to a phosphate group, resulting in the (E)-1,3-dienes, where the E type of transition state is favored due to the steric effect. Our findings indicate the intriguing role of hard-soft/acid-base (HSAB) theory in tuning the stereoselectivity of metal-catalyzed transformations with functionalized substrates.

16.
BMC Vet Res ; 11: 161, 2015 Jul 23.
Artigo em Inglês | MEDLINE | ID: mdl-26202328

RESUMO

BACKGROUND: Laminitis is considered as the most important cause of hoof lameness in dairy cows, which causes abundant economic losses in husbandry. Through intense efforts in past decades, the etiology of laminitis is preliminarily considered to be subacute ruminal acidosis; however, the pathogenesis of laminitis needs further research. The differentially expressed proteins (DEP) were detected in plasma of healthy cows and clinical laminitis cows by two-dimensional gel electrophoresis (2-DE) and identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. RESULTS: Nineteen protein spots were differentially expressed, and 16 kinds of proteins were identified after peptide mass fingerprint search and bioinformatics analysis. Of these, 12 proteins were differentially up-regulated and 4 down-regulated. Overall, these differential proteins were involved in carbohydrate metabolism, lipids metabolism, molecular transport, immune regulation, inflammatory response, oxidative stress and so on. CONCLUSIONS: The DEPs were closely related to the occurrence and development of laminitis and the lipid metabolic disturbance may be a new pathway to cause laminitis in dairy cows. The results provide the theory foundation for further revealing the mechanism of laminitis and screening the early diagnostic proteins and therapeutic target.


Assuntos
Doenças dos Bovinos/metabolismo , Doenças do Pé/veterinária , Casco e Garras/patologia , Proteômica/métodos , Animais , Bovinos , China , Doenças do Pé/metabolismo , Regulação da Expressão Gênica , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz , Espectrometria de Massas em Tandem , Regulação para Cima
17.
Med Biol Eng Comput ; 62(5): 1589-1600, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38319503

RESUMO

This paper presents a novel multi-scale attention residual network (MAResNet) for diagnosing patients with pulmonary tuberculosis (PTB) by computed tomography (CT) images. First, a three-dimensional (3D) network structure is applied in MAResNet based on the continuity and correlation of nodal features on different slices of CT images. Secondly, MAResNet incorporates the residual module and Convolutional Block Attention Module (CBAM) to reuse the shallow features of CT images and focus on key features to enhance the feature distinguishability of images. In addition, multi-scale inputs can increase the global receptive field of the network, extract the location information of PTB, and capture the local details of nodules. The expression ability of both high-level and low-level semantic information in the network can also be enhanced. The proposed MAResNet shows excellent results, with overall 94% accuracy in PTB classification. MAResNet based on 3D CT images can assist doctors make more accurate diagnosis of PTB and alleviate the burden of manual screening. In the experiment, a called Grad-CAM was employed to enhance the class activation mapping (CAM) technique for analyzing the model's output, which can identify lesions in important parts of the lungs and make transparent decisions.


Assuntos
Médicos , Tuberculose Pulmonar , Humanos , Tuberculose Pulmonar/diagnóstico por imagem , Redes Neurais de Computação , Semântica , Tomografia Computadorizada por Raios X
18.
Sci Rep ; 14(1): 661, 2024 01 05.
Artigo em Inglês | MEDLINE | ID: mdl-38182704

RESUMO

Frozen shoulder (FS) is a common disorder often treated with Tuina, but the mechanisms involved remain unclear. We employed proteomics and phosphoproteomics to investigate the mechanisms associated with the treatment of capsule fibrosis in FS rats. We used a method composed of three weeks of cast immobilization to establish a model of FS. We then administered Tuina once daily for 14 days, evaluated glenohumeral range of motion (ROM), assessed histological changes, and identified differentially expressed proteins (DEPs) using proteomics and phosphoproteomics. This study demonstrated that Tuina could improve glenohumeral ROM and reserve capsule fibrosis in FS rats. Proteomics revealed proteins regulated by Tuina belonging to the PI3K-AKT and ECM receptor interaction signaling pathways. Phosphoproteomics detected differentially phosphorylated proteins regulated by Tuina to be enriched in the MAPK signaling pathway. The combination of proteomics and phosphoproteomics for Protein-Protein Interaction (PPI) network analysis revealed that the phosphorylation of Myh3 and Srsf1 with a node degree larger than the average degree were considered the central regulatory protein modulated by Tuina to reverse capsule fibrosis. Thbs1, Vtn, and Tenascin-W were significantly enriched in PI3K-AKT and ECM receptor interaction signaling pathways and highly expressed in model rats. Tuina resulted in reduced expression of these proteins. Our findings demonstrated some of mechanisms behind the reversal of FS capsule fibrosis following Tuina, a scientific medical therapy for FS patients.


Assuntos
Bursite , Relatório de Pesquisa , Humanos , Animais , Ratos , Fosfatidilinositol 3-Quinases , Proteômica , Proteínas Proto-Oncogênicas c-akt , Bursite/terapia
19.
Sci Rep ; 13(1): 2927, 2023 Feb 20.
Artigo em Inglês | MEDLINE | ID: mdl-36806216

RESUMO

Studying the impact of large-scale ecological projects, such as the Grain-for-Green Program (GGP), on ecosystem services (ES) is currently a frontier and hot topic of ecological research. The GGP can directly change land use and land cover, thus affecting ES. By comparing the changes of ecosystem service value (ESV) and ecosystem service scarcity value (ESSV) in Qinghai before and after the implementation of the GGP, this paper clarified the impact of the GGP on Qinghai from the angles of ecology and economics. This paper quantified and evaluated the land use dynamics, ESV, and ESSV in Qinghai from 1995 to 2020. The results showed that in the past 25 years, the total annual Normalized Difference Vegetation Index (NDVI) of Qinghai showed a trend of sustained growth. From 1995 to 2020, the ESV increased by 6.80%. After considering supply and demand, the ESSV showed a continuous upward trend, increasing by 719.38%. After implementation of the GGP, the increase of NDVI inhibited the increase of the ESSV. These findings from evaluation of the effect of the GGP implementation provide a theoretical basis for future policy implementation and, in particular, a reference for the evaluation of the ESV and the ESSV in Qinghai.

20.
Medicine (Baltimore) ; 102(32): e34459, 2023 Aug 11.
Artigo em Inglês | MEDLINE | ID: mdl-37565882

RESUMO

To investigate the efficacy and safety of Jin three needles combined with Tong Qiao Wu Blood-streaming Tang in patients with acute ischemic stroke (AIS), this retrospective study analyzed the data of patients with AIS between January 2017 and December 2022. The National Institutes of Health Stroke Scale (NIHSS) scores, blood neuron-specific enolase, S100ß protein (S100ß), fibrinogen (FIB), cerebral infarct volume, D-dimer (D-D), prothrombin time (PT), activated partial thromboplastin time, hypersensitive c-reactive protein (hs-CRP), serum tumor necrosis factor-α (TNF-α), and homocysteine (Hcy) were compared between the 2 groups. The treatment effect was significantly better in the observation group than in the comparison group (P < .05). The NIHSS score, neuron-specific enolase, S100ß, and cerebral infarct volume were significantly lower in both groups after treatment than before treatment (P < .05). FIB and D-D levels were significantly lower and APTT and PT levels were significantly higher in both groups after treatment than before treatment (P < .05). TNF-α, hs-CRP, and Hcy were significantly lower in both groups after treatment than before treatment, and TNF-α, hs-CRP and Hcy were significantly lower in the observation group than in the comparison group (P < .05). No statistically significant difference in the incidence of adverse reactions occurred between the 2 groups (P > .05). Combining Jin three needles can improve the therapeutic effect in patients with AIS, promote the recovery of neurological function, improve coagulation function, and reduce the inflammatory response with good safety.


Assuntos
AVC Isquêmico , Acidente Vascular Cerebral , Humanos , Proteína C-Reativa/metabolismo , Estudos Retrospectivos , Agulhas , Fator de Necrose Tumoral alfa/uso terapêutico , Acidente Vascular Cerebral/tratamento farmacológico , Fibrinogênio/uso terapêutico , Infarto Cerebral
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