19 results about "Cell Microenvironment" patented technology

Disclosed in the present invention are a biomimetic vascularized iPSC-hep spheroid for liver regeneration, and a preparation method therefor. The biomimetic vascularized iPSC-hep spheroid is a microcapsule with a porous hyaluronic acid methacryloyl as a shell and a human-induced pluripotent stem-cell-derived hepatocyte spheroid as an inner phase, and human umbilical vein endothelial cells adhere to the surface of the shell. The biomimetic vascularized iPSC-hep spheroid of the present invention promotes effective communication between hiPSC-heps and HUVECs, and provides barrier protection for an encapsulated hiPSC-hep spheroid so as to avoid attack by the immune system. Compared with dispersed cells, the cell-to-cell interaction in the cell spheroid improves cell-to-cell communication, helps to simulate the physiological heterogeneous structure and cell microenvironment of the liver, and can more effectively repair an acutely failing liver.

The invention provides a cell classification system and application based on a cell microenvironment map attention network, and the method comprises the following steps: obtaining a mask of each cell nucleus in a TCT image and a centroid coordinate of each cell nucleus, and obtaining a morphological feature vector of each cell nucleus based on each cell nucleus mask, obtaining a depth visual feature vector of each single cell image based on the centroid coordinate of each cell nucleus; constructing an initial cell microenvironment structure chart and carrying out chart attention calculation on the initial cell microenvironment structure chart; and using a classifier to classify the image attention calculation result to obtain the regional cell category of the TCT image. According to the scheme, the cell microenvironment map is constructed based on each cell nucleus in the TCT image, and the node features in the cell microenvironment map are updated by using the map attention mechanism, so that the classification result of the cell nucleus is more accurate, and a key basis is provided for clinical diagnosis and treatment.

The invention provides responsive release polypeptide hydrogel. The hydrogel comprises a gel product of a raw material composition containing the following raw material components: (A) a biocompatible polymer containing at least two sulfydryl groups; (B) a matrix metalloproteinase substrate polypeptide; (C) a compound containing a phenolic hydroxyl group structure; (D) a cross-linking agent; and (E) water; the sequence of the matrix metalloproteinase substrate polypeptide is at least one of the following sequences (b1) to (b2): (b1) Cys-Pro-Leu-Gly-Val-Arg-Gly-Arg-Gly-Asp-Ser, (b2) Cys-Pro-Leu-Gly-Val-Arg-Gly-Asp-Ser, (b3) Cys-Pro-Leu-Gly-Val-Arg-Gly (b2), Dnp-Pro-Leu-Gly-Met-Trp-Ser-Arg-C-ys, and (b3), Dnp-Pro-Leu-Gly- The responsive release polypeptide hydrogel can release polypeptide in a cell microenvironment to promote tissue regeneration and repair, and can be used for preparing muscle-bone healing promoting materials and treating ligament injury diseases such as rotator cuff injury.

The invention discloses a method for low-density amplification of T cells and an obtained product, and belongs to the technical field of cell culture. The method comprises the following steps: activating a cell population containing T cells, and co-culturing with a lentiviral vector carrying a target gene for transduction; the method comprises the following steps: transduction is carried out on cells, then the transduction cells are inoculated into a shake flask at an inoculation density of not higher than 2 * 10 < 5 > cells / mL, shake culture is carried out to realize amplification, and amplification of 30-120 times can be realized. According to the method, a low-density cell microenvironment is optimized through dynamic oscillation, the problems of signal insufficiency, factor dilution and metabolism imbalance are solved, the efficiency bottleneck of traditional low-density amplification is broken through, and the method is suitable for large-scale production. The method has the beneficial effects of simplicity in operation, high cell product viability, high purity, low cost, wide scale adaptability and the like. The invention also provides a T cell product prepared by the method.

This invention provides a cell microenvironment stabilizer that captures hydrogen ions, its preparation method, and its application, belonging to the field of biomedical technology. The preparation method of this cell microenvironment stabilizer includes the following steps: (1) mineralizing CaCl2 with TGF-β1, catalase, and polyethylene glycol-polyglutamic acid block copolymer to obtain mineralized nanoparticles; (2) preparing hydrogel microspheres under freezing conditions using a microfluidic device, and then photocrosslinking the frozen hydrogel microspheres; (3) mixing the hydrogel microspheres with the mineralized nanoparticles to prepare the cell microenvironment stabilizer. This invention prepares a mineralized hydrogel microsphere, which, as a cell microenvironment stabilizer, can be used to block the NLRP3 cascade in chronic inflammation, capturing excess hydrogen ions through the mineralization layer to neutralize the acidic microenvironment. This micro / nano bioreactor based on hydrogel microspheres can effectively interfere with NLRP3 in the microenvironment of degenerated tissues from inside and outside the cells, inhibiting chronic inflammation.

The invention discloses a bionic heterogeneous tissue engineering meniscus stent and a preparation method thereof, and discloses application of the bionic heterogeneous tissue engineering meniscus stent in the field of meniscus repair. Based on a multi-nozzle 3D printing technology, a biodegradable high polymer material and bio-ink loaded with growth factors / stem cells are innovatively adopted, and the highly bionic heterogeneous tissue engineering meniscus is constructed. Specifically, degradable macromolecular polycaprolactone (PCL) is used as a raw material, and annular and radial fibers are printed to form a stent frame by accurately regulating and controlling a printing path and simulating a natural meniscus collagenous fiber distribution rule; on the basis, biological ink loaded with differentiated growth factors and stem cells is printed in a staggered manner according to different physiological characteristics of a red region and a white region of the meniscus, so that partitioned precise inoculation of seed cells and controllable partitioned release of the growth factors are realized, and a cell microenvironment with spatial specificity is provided for meniscus regeneration; the tissue repair efficiency and the bionic integrating degree are obviously improved.

The invention discloses a droplet micro-fluidic device for cell co-culture and a use method, belongs to the field of micro-fluidic analysis, and particularly relates to a droplet micro-fluidic device which comprises a chip main body material, an oily liquid substance covering the surface of the chip main body material, and a vertical porous membrane material arranged in the oily liquid substance. The porous membrane material comprises at least one of a polycarbonate porous membrane, a PVDF (Polyvinylidene Fluoride) porous membrane and a porous composite membrane, and the porosity of the porous membrane material is more than 1%. The droplet microfluidic device has the advantages of high flux, low consumption, multi-step operation, direct observation and the like, and has strong compatibility with a classical biochemical mechanism analysis method. The liquid drops are separated by the porous membrane material and are connected with each other, and the liquid drops on the two sides can be used as a cell, organoid or tissue culture chamber and also can be used as a liquid storage tank for sample adding. The liquid drops are used as a culture chamber, so that co-culture of cells can be realized, and support is provided for cell co-culture, drug screening and cell microenvironment simulation.

The invention discloses application of a Dow Corning SYLGARD 184 organic silicon elastomer in preparation of a three-dimensional cell culture medium, and belongs to the technical field of biological materials. The matrix is formed by mixing an A-agent prepolymer and a B-agent curing agent of SYLGARD 184 according to the weight ratio of (8-12): 1 and then curing at the temperature of 35-39 DEG C. The method is characterized in that the substrate can support cell attachment without plasma treatment, and surface modification can be carried out through I-type collagen to enhance cell adhesion, so that a unique dual-mode cell microenvironment regulation and control system is formed. The matrix provided by the invention is simple to operate, low in cost and high in batch stability, effectively overcomes the defects of uncertain components, complex hydrogel synthesis treatment and the like of the existing animal-derived matrix, and can be widely applied to three-dimensional cell culture, disease model construction and drug screening platforms.

The invention discloses a blood vessel-cell microenvironment visualization model multi-parameter fusion analysis method based on the combination of DCE-MRI and DWI. The blood vessel-cell microenvironment visualization model multi-parameter fusion analysis method based on the combination of DCE-MRI and DWI comprises the following steps: constructing an LCBM blood vessel-cell microenvironment visualization model by quantifying parameters such as Ktrans, Vp and ADC; specifically, the research aims to clarify DCE-MRI / DWI characteristic spectrums of different tissue pathology subtypes of LCBM and reveal blood vessel-cell microenvironment characteristics of the LCBM, and the innovation of the research lies in that DCE-MRI blood vessel function parameters and DWI structure parameters are integrated for the first time, a blood vessel-cell microenvironment visualization model of the LCBM is constructed, and the blood vessel-cell microenvironment visualization model of the LCBM is established. An iconography basis is provided for precise typing of the LCBM and selection of an anti-vascular treatment target region, a new tool is provided for pathophysiology evaluation of the LCBM, and an iconography foundation is laid for an individualized treatment strategy targeting the pathophysiology of the LCBM.

The application provides a fluorescent probe for detecting cell microenvironment viscosity change and a preparation method thereof, and the fluorescent probe is 2-((E)-2-(6-((Z)-(4-(dimethylamino)phenyl)azo)-2,3-dihydro-1H-thioxanthene-4-yl)vinyl)-1,3,3-trimethyl-3H-indol-1-ium. The fluorescent probe can make the electron donor and the electron acceptor freely run around the N=N double bond in a low viscosity environment. When being stimulated by light, the energy of the excited state is released in a non-radiation mode through a TICT mechanism, so that weak fluorescence is displayed. In a high viscosity environment, intramolecular rotation is limited, the energy of the excited state is emitted in a light radiation mode, so that strong fluorescence is generated. The probe has high sensitivity for microenvironment viscosity detection and does not interfere with other common active oxygen, amino acid and enzyme species.

The application discloses a preparation method of a fluorescent probe capable of simultaneously detecting viscosity and polarity and application thereof in biological imaging and belongs to the technical field of chemical analysis and detection. The probe DHBP can simultaneously detect the changes of viscosity and polarity. With the increase of the solution viscosity, the fluorescence intensity of the red channel gradually increases, and the probe can be used as a viscosity sensitive probe. With the decrease of the solution polarity, the green channel of the probe is enhanced and the fluorescence of the red channel is enhanced, and the probe can be used as a polarity sensitive probe. The probe has low cytotoxicity, can be used for distinguishing normal cells and cancer cells, monitoring the inflammation induced by lipopolysaccharide and the changes of the cell microenvironment before and after treatment, and is successfully applied to the in vivo. In addition, the probe DHBP can evaluate the liver damage degree of a diabetic mouse and the drug treatment effect through fluorescence imaging.

The invention discloses a co-culture bottle for different types of cells, which comprises a bottle body, a separation membrane is arranged in the bottle body, the interior of the bottle body is divided into a first culture area and a second culture area by the separation membrane, the bottle body is provided with a first bottle opening and a second bottle opening, the first bottle opening is communicated with the first culture area, and the second bottle opening is communicated with the second culture area. And the second bottle opening is communicated with the second culture area. The bottle body is divided into the first culture area and the second culture area which are independent from each other through the separation membrane, so that physical isolation of different types of cells can be realized, target cell purity reduction caused by mutual confusion of the cells is avoided, free exchange of small molecular substances such as a culture medium, cell metabolites and growth factors can be allowed by utilizing a microporous structure, and the cell culture efficiency is improved. The requirement of interaction between cells through substance signals in co-culture is met, and the in-vivo cell microenvironment is simulated to the maximum extent.

The invention belongs to the technical field of biological medicine, and particularly relates to application of farnesol in preparation of a medicine for resisting senescence of mesenchymal stem cells. The invention discloses farnesol as a traditional Chinese medicine monomer for the first time, which can effectively slow down the aging of adriamycin-induced adipose-derived stem cells in vitro, and can be used for preparing the anti-aging medicines for the mesenchymal stem cells. The farnesol can be used for removing aged adipose-derived stem cells and maintaining the steady state of a cell microenvironment. After treatment with 2 [mu] M farnesol for 24 h, key senescence markers such as P53 and P21 in adriamycin-induced senescence adipose-derived stem cells are significantly reduced, which indicates that farnesol can down-regulate senescence signal pathways in cells.

The application discloses a 3D bioprinted radial porous scaffold for staged bone regeneration and a preparation method thereof, the 3D bioprinted radial porous scaffold can provide a biomimetic cell microenvironment to support the infiltration of host repair cells to a defect site, and promote bone integration after implantation, in addition, the sequential release of double growth factors and the sustained release of PO4 3‑ and Ca 2+ in the 3D bioprinted radial porous scaffold can complete the three key steps of staged bone regeneration, can realize efficient bone regeneration, and represents a promising biomimetic staged regeneration strategy.

The invention belongs to the technical field of biological medicine and functional protein engineering, and particularly relates to recombinant IV type humanized collagen as well as preparation and application thereof. The invention provides a novel human-derived IV-type collagen functional fragment, which not only can be efficiently expressed and purified in a recombination mode, but also shows the capability of remarkably promoting human skin fibroblasts (HSF) to secrete and express III-type collagen in functional verification, and has definite tissue repair and skin regeneration regulation potential. In-vitro cell experiments prove that the recombinant collagen fragment provided by the invention can promote adhesion, migration and proliferation of fibroblasts or keratinocytes, and has the functions of repairing, regenerating and supporting a cell microenvironment.

The present application relates to the technical field of skin care products, and in particular to a stem cell composition for improving aging and metabolic dullness and a preparation method thereof.The composition is compounded by an animal umbilical cord extract, a schizosaccharomyces pombe fermentation product lysate, DNA sodium, a tripeptide-105 and a cold orchid extract, and the five components synergistically regulate, accelerate melanin metabolism, reduce melanin deposition, inhibit melanin production, stimulate cell regeneration, replace old and worn-out cells, repair damaged cells, enhance cell vitality, inhibit inflammatory response, calm the cell microenvironment, and achieve the best long-acting lightening, whitening, barrier repair, soothing irritation, and improvement of severe acne clinical effects in terms of efficacy.The composition not only has faster and longer-lasting effects, but also has good safety and applicability, and has a broad market application prospect.

The application relates to the field of biological imaging, and particularly discloses a two-photon frequency-domain fluorescence lifetime imaging in-vitro cell microenvironment dynamic monitoring method, which comprises the following steps: S1, two-photon frequency-domain fluorescence lifetime imaging (TP-FD-FLIM) technology is utilized, microenvironment changes are non-destructively characterized through fluorescence lifetime parameters, oxidative stress reaction and neutrophil migration behavior are monitored in real time, and compound effect analysis is combined with an in-vitro cell model; and S2, a frequency-domain fluorescence lifetime signal processing and analysis system based on the physical basis of FD-FLIM is established, dynamic correlation characteristics of phase delay phi and modulation depth M of a fluorescence signal relative to excitation light are analyzed, and quantitative back calculation of a molecular lifetime parameter is carried out. The two-photon frequency-domain fluorescence lifetime imaging in-vitro cell microenvironment dynamic monitoring method can non-destructively and in real time observe neuroinflammatory reaction on a subcellular scale.

The invention relates to a double-network hydrogel. The double-network hydrogel is constructed from an animal acellular extracellular matrix and polypeptide. The invention discloses extraction of animal acellular extracellular matrix, and a method and application of the animal acellular extracellular matrix and polypeptide to construct the dual-network hydrogel. The preparation method comprises the following steps: cleaning and crushing animal tissues, carrying out decellularization treatment by using sodium chloride and urea to obtain an extracellular matrix of the animal tissues, removing other components through dialysis, and compounding the extracellular matrix with polypeptide hydrogel to form an interlaced dual-network scaffold through mutual response. The scaffold structure provides an effective support environment for cell three-dimensional culture, realizes optimization of cell three-dimensional microenvironment construction, and can be applied to cell culture and organoid culture.

The invention belongs to the technical field of animal and plant cultivation and planting, and discloses an alkaline liquid ionized mineral animal and plant nutrition enhancer as well as a preparation method and application thereof. Comprising sea crystal, silicate, potassium salt, sodium salt, sugar, rare earth, L-proline and water, has the pH value of 11.5-12.5, and is a low-oxygen and high-reduction-state alkaline ionic liquid system. Based on a cell microenvironment steady state theory, a negative hydrogen ion anti-oxidation mechanism and an alkaline ion mineral activity regulation and control technology, synergistic release and efficient utilization of various key nutritional factors are realized, and tolerance of animals and plants to external stress and the overall health level are improved.