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1.
Cell Rep ; 42(11): 113368, 2023 11 28.
Artigo em Inglês | MEDLINE | ID: mdl-37917581

RESUMO

Ischemic brain injury is a severe medical condition with high incidences in elderly people without effective treatment for the resulting neural damages. Using a unilateral mouse stroke model, we analyze single-cell transcriptomes of ipsilateral and contralateral cortical penumbra regions to objectively reveal molecular events with single-cell resolution at 4 h and 1, 3, and 7 days post-injury. Here, we report that neurons are among the first cells that sense the lack of blood supplies by elevated expression of CCAAT/enhancer-binding protein ß (C/EBPß). To our surprise, the canonical inflammatory cytokine gene targets for C/EBPß, including interleukin-1ß (IL-1ß) and tumor necrosis factor α (TNF-α), are subsequently induced also in neuronal cells. Neuronal-specific silencing of C/EBPß or IL-1ß and TNF-α substantially alleviates downstream inflammatory injury responses and is profoundly neural protective. Taken together, our findings reveal a neuronal inflammatory mechanism underlying early pathological triggers of ischemic brain injury.


Assuntos
Lesões Encefálicas , Acidente Vascular Cerebral , Humanos , Camundongos , Animais , Idoso , Fator de Necrose Tumoral alfa/genética , Fator de Necrose Tumoral alfa/metabolismo , Regulação da Expressão Gênica , Neurônios/metabolismo , Acidente Vascular Cerebral/genética , Acidente Vascular Cerebral/metabolismo , Modelos Animais de Doenças , Lesões Encefálicas/metabolismo , Proteína beta Intensificadora de Ligação a CCAAT/metabolismo
2.
Biosens Bioelectron ; 203: 114044, 2022 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-35123316

RESUMO

A biosensor integrated with mannose nano-surface was developed for the identification and adhesive strength evaluation of bacteria. Different bacteria were studied on the designed surface by both electrochemical impedance spectroscopy (EIS) and surface enhanced Raman spectroscopy (SERS). S. typhimurium and E. coli JM109 (type 1 pili) were found to be captured by the mannose nano-surface. SERS spectra were used to identify the species of captured bacteria by combing with partial least squares discriminant analysis (PLS-DA). Meanwhile, binding affinities of the two captured bacteria to mannose nano-surface were obtained by EIS measurements and Frumkin isotherm model analysis, which were 6.859 × 1023 M-1 and 2.054 × 1017 M-1 respectively. A higher binding affinity indicates a stronger adhesive strength. Hence the results show the S. typhimurium has a stronger adhesive strength to mannose. Normalized impedance change (NIC) was proved to have a positive relevant relationship with binding affinities, which could be used as an indicator for the adhesive strength of bacteria. It was demonstrated that 100% accuracy of bacteria species discrimination and good consistency of NIC and adhesive strength for blind samples. The developed biosensor can provide both qualitative and quantitative information of selective recognition between bacteria and mannose.


Assuntos
Técnicas Biossensoriais , Adesivos , Escherichia coli , Manose , Análise Espectral Raman/métodos
3.
Mikrochim Acta ; 189(2): 54, 2022 01 10.
Artigo em Inglês | MEDLINE | ID: mdl-35001163

RESUMO

Laser-induced graphene (LIG) is a class of three-dimensional (3D) porous carbon nanomaterial. It can be prepared by direct laser writing on some polymer materials in the air. Because of its features of simplicity, fast production, and excellent physicochemical properties, it was widely used in medical sensing devices. This minireview gives an overview of the characteristics of LIG and LIG-driven sensors. Various methods for preparing graphene were compared and discussed. The applications of the LIG in biochemical sensors for ions, small molecules, microRNA, protein, and cell detection were highlighted. LIG-based physical physiological sensors and wearable electronics for medical applications were also included. Finally, our insights into current challenges and prospects for LIG-based medical sensing devices were presented.


Assuntos
Técnicas Eletroquímicas/métodos , Grafite/química , Lasers , Monitorização Fisiológica/instrumentação , Nanoestruturas/química , Técnicas Biossensoriais , Humanos , Monitorização Fisiológica/métodos , Dispositivos Eletrônicos Vestíveis
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