14 results about "Nuclear membrane" patented technology

The invention belongs to the technical field of animal reproductive biology and cell engineering, and particularly relates to a fluorescence labeling expression system for visualizing an oocyte nucleus maturation process and application of the fluorescence labeling expression system. The fluorescence labeling expression system comprises an eukaryotic expression vector pVenus-LMNB1; the eukaryotic expression vector pVenus-LMNB1 comprises a nucleotide sequence for coding the fusion protein Venus-LMNB1. According to the invention, a nuclear fiber layer protein stably expressed on a nuclear membrane is selected as a research object, a eukaryotic expression vector pVenus-LMNB1 is constructed by using a molecular cloning technology, an LMNB1 gene containing a green fluorescent label Venus is overexpressed in a porcine oocyte by using a microinjection technology, fluorescent protein labeling of a structural protein on the nuclear membrane is utilized, and the expression vector pVenus-LMNB1 is constructed. The expression positioning condition of the LMNB1 in the maturation process of the porcine oocytes is observed, and a powerful tool is provided for development of in-vitro culture related researches of the porcine oocytes.

This invention discloses a method for constructing a tomato core membrane-associated protein interaction library based on Gateway technology under Fusarium oxysporum infection conditions and its application, relating to the field of genetic engineering technology. The method includes: using tomato root tissue infected with Fusarium oxysporum as material, extracting total RNA and enriching mRNA; synthesizing first-strand cDNA using Biotin-attB2-Oligo(dT) primers; synthesizing double-stranded cDNA enzymatically; ligating it with a specific double-stranded attB1 adapter; introducing attB1 and attB2 sites at both ends of the cDNA; cloning the cDNA into the donor vector pDONR222 via BP recombination to construct a primary entry library; and recombinating the primary entry library with vectors pGADT7 and pPR3-N via LR recombination to construct a nuclear secondary library and a membrane secondary library, respectively. The constructed libraries have high titers, long insert fragments, and low empty vector rates. This invention also relates to the application of the library in screening the interaction between Fusarium oxysporum effector proteins and tomato nuclear membrane-associated proteins, providing an efficient and specific resource platform for studying plant-pathogen interaction mechanisms.

The present application relates to the technical field of digital pathology image analysis, and discloses an animal tissue pathological section cell atypia image automatic grading method and system, the method comprises the following steps: scanning the whole section image to obtain a high-power field image by traversing the tumor area with a sliding window; inputting a star-convex polygon regression kernel instance segmentation network trained by multi-species animal tumor annotation data to obtain each nuclear boundary; extracting morphological parameters such as nuclear area, long-short axis ratio, nuclear-plasma ratio, nuclear membrane regularity and chromatin texture; detecting and counting nuclear mitotic figures; introducing a species adaptive baseline correction to normalize the morphological parameters and then inputting the normalized morphological parameters into a classifier to output a three-level atypia grading.

The invention provides an application of a lipid peroxidation inhibitor in preparation of an anti-premature senescence syndrome drug or an anti-aging drug. Experiments prove that by adding the lipid peroxidation inhibitor, the cell nucleus morphology of cells can be effectively maintained, the expression of intracellular senescence-related beta-galactosidase is reduced, the senescence characteristic of the cells is delayed, and nuclear membranes and nuclear fiber layers damaged due to Progyrin accumulation are repaired, so that the normal functions of the cell nucleuses are recovered, the activity and functions of the cells are improved, and the anti-aging effect is achieved. Powerful cellular level support is provided for relieving and treating the early senescence syndrome and senescence.

The present application relates to the technical field of edge detection algorithm, and particularly relates to an end-to-end cell aging state prediction method based on nuclear membrane morphology, which comprises the following steps: step one, collecting a fluorescence image of human fibroblasts subjected to immunofluorescence staining through a fluorescence microscope; step two, performing data enhancement processing on nuclear membrane data, amplifying training data, and improving model generalization capability; step three, generating a prediction of nuclear membrane segmentation mask through a deep neural network, and obtaining mask information; and step four, simultaneously inputting the mask information into an ellipticity module, a smoothness module and a concave degree module for multi-angle calculation and evaluation. The present application evaluates nuclear membrane morphology changes from multiple angles to meet the growing demand for quantification of cell aging state in the field.

The invention relates to a Pin1 protein targeted antagonistic polypeptide, a targeted antagonistic polypeptide nano-micelle as well as a preparation method and application of the targeted antagonistic polypeptide nano-micelle. The Pin1 protein targeted antagonistic polypeptide comprises a targeted antagonistic polypeptide and a cell-penetrating peptide which are connected in sequence, the amino acid sequence of the targeted antagonistic polypeptide comprises any one of SEQ ID NO: 1, SEQ ID NO: 2, SEQ ID NO: 3, SEQ ID NO: 4 or SEQ ID NO: 5; the amino acid sequence of the cell-penetrating peptide comprises SEQ ID NO: 6. The Pin1 protein targeted antagonistic polypeptide can efficiently cross cell membranes and nuclear membranes, is specifically combined with the Pin1 protein in human metastatic pancreatic adenocarcinoma cells, antagonizes the biological function of the Pin1 protein and kills tumor cells. Meanwhile, the Pin1 protein targeting antagonistic polypeptide is combined with gemcitabine, so that the sensitivity of a mixed in-situ tumor model of human metastatic pancreatic adenocarcinoma cells and cancer-related fibroblasts to gemcitabine can be enhanced, the anti-cancer effect of a single drug is amplified, and the anti-tumor effect of 1 + 1 > 2 is generated.

The invention provides a cell virtual staining method and system, computer equipment and a storage medium, and belongs to the field of cell detection.The method comprises the steps that a microscopic image of a to-be-stained cell is obtained; a multi-scale structural feature map is extracted from the microscopic image, the multi-scale structural feature map is weighted based on a regional attention mechanism to obtain cell structural features of the cell to be stained, and the weight of the boundary features is in positive correlation with the cell nucleus density; extracting color distribution features from a preset reference dyed image, and performing spatial alignment and semantic mapping on the color distribution features and the cell structure features to obtain fusion features; and performing image reconstruction according to the fusion features to obtain a staining image of the to-be-stained cell. According to the method, the display effect on fine structures such as cell nuclear membranes and chromatin distribution is improved, and the high-precision requirement of clinical diagnosis on cell substructure recognition is met.

This invention discloses a method for constructing a cell nucleus model based on Abaqus-Python, relating to the field of cell stress analysis technology. This method utilizes Abaqus finite element software to draw a cell nucleus model and analyze its mechanical properties. Simultaneously, it employs Python for secondary development, simplifying the model drawing process through scripting and improving the efficiency and accuracy of model creation. This model can be used to calculate the stress distribution of the cell nucleus's main structures—the nuclear membrane and nuclear lamina—during the process of nanoneedles penetrating the cell nucleus, and to optimize nanoneedle parameters by analyzing the stress concentration of the nuclear membrane during penetration.

The present application relates to the technical field of genetic engineering, and particularly relates to a screening method of an anti-aging drug. The screening method comprises: treating cells overexpressing GFP-progerin protein with a drug to be screened, and comparing the cells overexpressing GFP-progerin protein without treatment of the drug to be screened; and judging the anti-aging effect of the drug to be screened according to the change of cell morphology. The present application finds that progerin protein positioned on the nuclear membrane can make cells show obvious aging characteristics, including nuclear membrane shrinkage and nuclear membrane budding. Progerin protein positioned in the nucleus does not make cells show obvious aging characteristics. When a drug has an anti-aging effect, progerin protein positioned on the nuclear membrane will be transferred to the nucleus. The present application provides a screening method of an anti-aging drug based on the above, which can accurately and efficiently screen an anti-aging drug.

Disclosed are systems, devices, and methods for delivering substances from the cytoplasm into the nucleus of cell by selectively disrupting the nuclear membrane. In some aspects, a method for delivering substances into a nucleus of a cell includes creating one or more pores in the nucleus of the cell by imposing one or more nanoscale geometric and / or physical constraints on the cell. In some embodiments of the method, the method includes enabling entry of substances into the nucleus through the created one or more pores.

The invention discloses a nucleic acid delivery system and a preparation method and application thereof, and belongs to the technical field of biological materials. According to the invention, a benzenesulfonamide functional group is introduced into a GSs molecular skeleton, such that a novel benzenesulfonamide functionalized gemini surfactant (NGS) is constructed. Wherein benzenesulfonamide is a specific endoplasmic reticulum targeting group, and can realize endoplasmic reticulum targeting enrichment through specific binding with a sulfonylurea receptor on an endoplasmic reticulum membrane, so that the NGS gene delivery vector is distributed towards the endoplasmic reticulum. After the NGS and the pDNA form a compound, the compound enters cells through cavette protein mediated endocytosis, then targets the endoplasmic reticulum and releases the pDNA, the pDNA is delivered into the cell nucleus by utilizing the close relation between the endoplasmic reticulum and the nuclear membrane, the gene transfection efficiency is finally improved, meanwhile, the biocompatibility is further improved by introducing the gamma-polyglutamic acid (gamma-PGA) with negative charges, and the application prospect is wide.

The invention relates to the technical field of biochemical sensing and fluorescence imaging, in particular to a chromazole near-infrared viscosity-sensitive probe, a preparation method thereof and application of the probe in living cell imaging. The preparation method of the probe comprises the following steps: dissolving tryptazole tetrafluoroborate and benzaldehyde or a derivative thereof in acetonitrile, stirring at room temperature to react, evaporating to remove a solvent after the reaction is finished, and separating and purifying through column chromatography to obtain the tryptazole near-infrared viscosity sensitive probe. The application of the probe in living cell nucleus imaging is to mark chromosomes in a cell mitosis process, so that chromosome migration behaviors are visualized. The probe is high in utilization rate, mild in preparation reaction condition, simple and convenient to operate, green and efficient. The cell nucleus of the living cell can be quickly dyed at low concentration, the cytoplasm, the nuclear membrane and the nucleolus of the living cell can be distinguished through the fluorescence brightness, and the mitosis process of the cell can be traced. A feasible strategy is provided for developing a near-infrared probe with a rapid cell nucleus staining function.

The present disclosure provides a method of treating or preventing a heart disease, by administering to a patient at risk of such heart disease, a pharmaceutically effective amount of a recombinant AAV-based or fusion protein-based composition that is localized to the outer nuclear membrane, binds to P-AR or suppresses perinuclear cAMP production, or a composition that expresses a protein that binds or a composition that binds to binds to P-AR, or suppresses perinuclear cAMP production. The composition may be in the form of a peptide that specifically inhibits P-AR near the nucleus, or in the form of a viral-based gene therapy vector encoding a fusion protein that inhibits perinuclear P-AR, or suppresses perinuclear cAMP production.

The invention relates to a system and methods for enhancing access to nuclear informational molecules, such as DNA, RNA, and proteins, by analytical biomolecules, such as transposome complexes, by treating nuclei with a nuclear permeability enhancer, and to methods of using nuclear membrane, cell membrane, and external compartmentalization approaches as contiguity preserving elements.