82 results about "Cellular viability" patented technology

The invention discloses a preparation method and application of a photo-thermal biosensor for tumor cell quantification and vitality dual-index liquid biopsy. Phosphatidylserine (PS) is exposed by enriching and cracking tumor cells, is identified and combined by an aptamer Apt2, and is driven to be separated from Apt2-Cu2-xTe NSs; after magnetic separation, separated supernatant is subjected to photo-thermal detection; the photo-thermal signal intensity is positively correlated with the number of cells, so that quantitative detection is realized; during cell apoptosis, PS is turned out of the membrane, Apt2-Cu2-xTe NSs is combined with the surface of the membrane, separated supernatant is subjected to photo-thermal detection after magnetic separation, and the photo-thermal signal enhancement amplitude is in negative correlation with cell activity. The platform has the advantages of POCT characteristics, low cost and portability, and a new tool is provided for precise tumor diagnosis and treatment.

A method of culturing cells, the method including providing a microfluidic device including a substrate including an array of grooves that are substantially parallel; introducing cells into one or more of the grooves; providing a flow of culture medium over the groove array in a first flow direction that is across the grooves; culturing the cells under conditions to support viability, growth or differentiation, optionally wherein: (i) the cells are introduced into one or more grooves by flow over the groove array in the first flow direction; and / or (ii) the flow of culture medium is provided at a flow rate equivalent to 0.2-5 mL per million cells per day; and / or (iii) the cells are cultured for 1-14 days.

The invention discloses a single cell activity evaluation method based on cell nucleus geometric parameters and a Bayesian framework, which comprises the following steps: establishing a HeLa cell activity gradient model through adriamycin induction, carrying out cell nucleus segmentation by adopting Cell pose 3.0 and extracting 26 geometric features, screening a high-confidence sample in combination with a Bayesian deep learning framework, and evaluating the activity of a single cell according to the high-confidence sample. And constructing a multi-modal feature fusion model to integrate geometric features and deep semantic features, and finally realizing unmarked and high-precision single cell activity evaluation. The method overcomes the limitation that a traditional technology depends on biochemical markers, has the advantages of being easy and convenient to operate, high in flux and high in interpretability, and provides an innovative technical means for tumor liquid biopsy and precise medical treatment.

A method for determining a state of a cell, the cell being placed in a sample in contact with a culture medium, includes illuminating the sample with a light source and acquiring an image of the sample with an image sensor, the image sensor lying in a detection plane. From the acquired image, a position of the cell in a plane parallel to the detection plane is located and a refractive index or a relative refractive index of the cell is estimated, the relative refractive index corresponding to a refractive index of the cell relative to the refractive index of the culture medium. From the estimation, an index of interest of the cell is determined. From the index, a state of the cell among predetermined states is classified, the predetermined states including at least one apoptosis state and one living state.

The invention discloses a TMPRSS2 protein inhibitor efficacy prediction calculation method. A scoring function is constructed through a logP value, a virtual docking score and living cell inhibitor effect data to predict a drug inhibition effect. The method specifically comprises the following steps: constructing a TMPRSS2 overexpression cell model to screen drugs; the cell viability of various potential inhibitors is detected, and high-toxicity inhibitors are eliminated through a CCK-8 experiment; using flow cytometry to detect the cell average fluorescence intensity through a TMPRSS2 fluorescent probe to evaluate the enzyme activity influence of the inhibitor, and calculating the IC30 value; measuring the logP value of an effective inhibitor, and predicting the binding capacity of the effective inhibitor and TMPRSS2 by using Schrodinger software to obtain a virtual docking score; and analyzing the relationship among the IC30 value, the logP value and the virtual docking score, and constructing a scoring function to predict the drug effect. According to the method, the drug effect prediction can be simply, conveniently and quickly carried out, the drug screening consumption is reduced, and the drug screening period is shortened.

The invention discloses a preparation method and application of an electrochemical biosensor for dynamically monitoring Cyt c in tumor cells based on fast scanning voltammetry. The preparation method is characterized by comprising the following steps: 1) preparing a PtNE nano electrode; (2) preparing the PtNE / Apt nano electrochemical biosensor; and (3) accurately puncturing the PtNE / Apt electrode into cytoplasm of a single Hela cell through a three-dimensional micro-control system, so that Apt and intracellular Cyt c are specifically combined and subjected to conformational change, and 3 '-end modified Fc is close to the surface of the electrode, thereby generating a remarkable electrochemical signal. The change of Fc redox peak current is dynamically monitored through fast scanning voltammetry, the quantitative relation between the Cyt c concentration and the peak current is established, and the relation between the Cyt c concentration and the cell activity is monitored according to the quantitative relation. The device has the advantages of high sensitivity, excellent anti-interference capability and remarkable signal amplification effect.

A method of treating cancer cells includes exposing the cancer cells to a ZrO2 / CaSiO3 / g-C3N4 nanocomposite material. The ZrO2 / CaSiO3 / g-C3N4 nanocomposite material comprises spherical metal oxide nanoparticles comprising a ZrO2 phase and a CaSiO3 phase dispersed on a matrix of g-C3N4 nanosheets, wherein the spherical metal oxide nanoparticles have an average particle diameter in a range from 3 to 18 nm, and wherein the ZrO2 / CaSiO3 / g-C3N4 nanocomposite material has a percent inhibition for human breast carcinoma (MCF-7) cells greater than or equal to 80% inhibition in an in-vitro cellular viability assay.

Provided herein, inter alia, are methods and compositions for engineering T cells. The methods include culturing T cells with insulin during engineering of the T cells. The methods provided herein contemplate to increase cell viability, expansion and gene editing efficiency, allowing for an increase in the total number of engineered T cells.

The invention relates to the technical field of biological materials, in particular to a biocompatible method for synthesizing quantum dots from living cells, which comprises the following steps: in the living cell culture process, adding an organic selenium compound containing Se-Se or Se-S bonds into a culture medium, and incubating to obtain selenized cells; further culturing by using a culture medium containing a metal ion-glutathione complex to obtain quantum dots containing metal elements and Se elements; according to the method, the generation of an active selenium precursor with cytotoxicity, such as hydrogen selenide, is effectively avoided, and meanwhile, the outbreak of active oxygen species in cells is also avoided, so that high quantum dot synthesis efficiency is shown. In-vitro cell experiment results show that the cells are endowed with a fluorescent function and still maintain good cell viability, and the cell viability is maintained at 80% or above; in-vivo experiment results show that the fluorescent cells with the synthesized quantum dots have good proliferation, tumor formation, invasion and metastasis capabilities in vivo.

Provided are methods for the creation of ultra-high density cryopreserved cell banks. In certain embodiments, these methods employ altered perfusion culture techniques that allow for production of ultra-high density cell cultures that can be cryopreserved at unexpectedly high cell densities without the need for any cell concentration steps, while retaining excellent cell viability and quality.

Disclosed herein include methods, compositions, and kits suitable for use in preservation (e.g., cryopreservation) of samples. The composition (e.g., cryopreservation reagent) can comprise: one or more cryoprotective agent(s), one or more culture media component(s), one or more carbohydrate(s), and / or one or more amino acid(s). The composition can be capable of maintaining one or more cellular properties and / or cell viability of a plurality of cells in a sample for a period of time under a storage condition. Also provided are methods of sample preservation and sample analysis. The method can comprise contacting a sample with the cryopreservation reagent, thereby generating a shielded sample. The method can comprise exposing the shielded sample to a freezing storage condition, thereby generating a cryopreserved sample.

A method of inhibiting a cancer cell growth includes contacting the cancer cell with a Cu2(OH)3NO3 / CaSiO3@g-C3N4 nanocomposite material containing graphitic carbon nitride (g-C3N4), copper hydroxide nitrate (Cu2(OH)3NO3) and calcium silicate (CaSiO3), achieving an inhibition efficiency on human breast carcinoma (MCF-7) and human hepatocellular carcinoma (HepG-2) cell growth of greater than 95% in an in-vitro cellular viability assay.

The process provided in this invention transfects primary cells with gene editing reagents using a high-volume gas-permeable cell culture device and a flow-through electroporation device under conditions that improve gene editing performance, cell yield, and drug (DP) quality characteristics for cell therapy applications. As demonstrated in the examples, primary cells edited according to the process provided herein achieved improved double-strand break (DSB) formation rates, increased frequency of homology-directed repair (HR) and non-homologous end joining (NHEJ) combinations, increased frequency of bi-allelic and mono-allelic HR events, improved cell viability, proliferative capacity, and cell fitness after gene editing, and reduced manufacturing time.

The invention discloses a method for evaluating activity of a single CTC through deep learning based on nucleus morphology. The method comprises the following steps: acquiring cell nucleus images of CTCs in different vitality states through a fluorescence inverted microscope, constructing five state data sets of the cell nucleus by utilizing Cellpose3.0 and ImageJ, realizing accurate positioning and classification by combining an improved YOLOv8x model, and calculating a single cell vitality value by adopting transfer learning and confidence coefficient weighting. The method has the advantages of no label, no toxicity and single-cell-level resolution, solves the problems of group signal dependence, phototoxicity interference and low sensitivity of a traditional method, and provides a new tool for tumor metastasis monitoring and individualized treatment.

The invention relates to the technical field of biomedical processing, and particularly provides a cryopreservation method of cord blood mononuclear cells, which comprises six steps of whole blood separation, plasma inactivation, CBMC cell separation, cryopreservation liquid preparation, cell cryopreservation and detection after cryopreservation recovery. The CBMC cell separation comprises three sub-steps; performing cell cryopreservation, namely averagely dividing the separated CBMC into a plurality of parts, filling the CBMC into a cryopreservation tube according to a certain density, putting the cryopreservation tube into a programmed cooling instrument, and performing cryopreservation according to a plurality of programs; and detecting after cryopreservation and resuscitation, wherein the detection comprises three sub-steps of cell viability detection, cell recovery rate detection and cell function detection. The problems that in the cryopreservation process of a traditional method, cell viability is reduced, the number of cells is greatly reduced, cell adhesion and caking are caused, cell functions are abnormal, cell phenotypes are changed after recovery, functional activity is damaged and the like are solved, the utilization rate of the CBMC is increased, and the technical scheme is obviously superior to the traditional cell cryopreservation method; the viability, the recovery rate and the function of the recovered cells are obviously improved.

The invention provides a fluorescent probe as well as a preparation method and application thereof, and belongs to the technical field of biological analysis and detection. The fluorescent probe disclosed by the invention has a structure as shown in a formula I; the invention also provides a preparation method of the fluorescent probe and application of the fluorescent probe in cell activity detection or preparation of a cell activity detection kit. The fluorescent probe provided by the invention can reflect the cell state by migrating organelles, realizes dual-channel imaging, and can meet the actual requirements of cell activity detection.

A method of using the relaxation rate (R1 and / or R2) of solvent NMR signal to non-invasively estimate cell counts in cell cultures prepared under similar conditions as well as to use wNMR to measure cell viability. The methods can simply, rapidly, and non-invasively monitor the growth, health, and aging status of a cell culture, without any sample preparation or reagent (e.g., a dye) addition.

1. The name of the design product: multifunctional enzyme label instrument. 2. The use of the design product: for nucleic acid, protein concentration, enzyme activity analysis and other conventional molecular detection; signal transduction research, cell signal event active oxygen, modification detection; cell viability, apoptosis, killing and other overall level analysis. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective drawing.

Method for determining cell viability in a cell culture of biological cells for the biotechnological production of proteins, in particular antibodies, characterized in that a fluorescent dye selected from 4,4'-dianilino-1,1'-binaphthyl-5,5'-disulfonate (Bis-ANS) or 8-anilinonaphthalene-1-sulfonate (ANS) is used as a detection agent, and wherein the fluorescent dye is present in the cell culture at a concentration of 0.1 µM to 10 µM, the fluorescent dye selectively penetrates cells with damaged cell membranes and binds to intracellular proteins, the labeled cells are detected by excitation in the UV range and detection of the fluorescence in the green wavelength range, and the determination of cell viability is carried out using an automated imaging fluorescence microscope.

A method of treating cancer cells includes contacting the cancer cells with a CoO / CaSiO3@g-C3N4 nanocomposite material. The CoO / CaSiO3@g-C3N4 nanocomposite material includes hexagonal metal oxide nanoparticles comprising a CoO phase and a CaSiO3 phase dispersed on a matrix of g-C3N4 nanosheets. The hexagonal metal oxide nanoparticles have an average particle diameter in a range from 340 to 440 nm. The CoO / CaSiO3@g-C3N4 nanocomposite material has a percent inhibition for Human Breast Carcinoma (MCF-7) cells at least 55% inhibition in an in-vitro cellular viability assay.

The invention relates to a method and system for maintaining aseptic conditions and verifying filter integrity in a cell processing platform. The platform features an integrated pressure decay testing module to evaluate the functionality of hydrophilic and hydrophobic filters before and after processing. The system operates by pressurizing filters, measuring pressure decay, and determining integrity based on predefined thresholds, with results logged for compliance. The platform includes a cell processing cassette (CPC) equipped for sequential cell processing steps, such as washing, selection, activation, and harvesting, within a single chamber. Automated fluid and gas transfer systems, incorporating filters and emergency recovery pathways, ensure contamination-free operations. Additional features include UV disinfection, adaptive control systems for parameter optimization, and temperature-controlled environments to support cell viability. This comprehensive system enhances reliability, precision, and sterility in automated cell processing for advanced therapeutic applications.

An optimized method for expansion and large-scale production of regulatory T cells (Tregs) includes the following steps: preparing a cord blood-derived Treg-containing suspension; transferring the cord blood-derived Treg-containing suspension into a sterile tube matching with a magnetic pole, and magnetically sorting CD4+CD25+CD127− Tregs out; adding an expansion culture medium to Tregs carrying magnetic beads, conducting a primary culture for 1 d to 2 d, and conducting a subculture once every 1 d to 3 d, where a total culture time is 40 d to 50 d. Through one-step sorting, the method achieves very prominent cell expansion effects (shortened time and high cell viability), and increases an effective expansion time to 40 d to 50 d from 18 d. In addition, an expansion effect will not be gradually deteriorated. Thus, the method greatly increases the expansion generation number and the quantity of Tregs, and can meet the needs of clinical patients.

The invention relates to an application of kunbutton alcohol as an active ingredient in preparation of a medicine or a medical beauty product for inhibiting melanin synthesis. Cell activity detection and melanin content determination show that the content of melanin in cells can be remarkably reduced under the condition of not influencing the cell activity. Tyrosinase activity detection shows that tolvaptan does not affect the catalytic activity of TYR. Protein immunoblotting experiments show that tolvaptan can down-regulate the expression levels of TYR family proteins, ommatidium-associated transcription factors (MITF), cyclic adenylate reaction element binding proteins (CREB) and melanocortin-1 receptors (MC1R).

The present disclosure provides, among other things, a method of cryopreserving and thawing cells that results in the thawed cells having high cellular viability and functionality post-thawing. In some embodiments, a large-scale method of cryopreserving cells is provided, the method comprising: (a) contacting the cells with a cryopreservation medium; (b) cooling the cells to −80° C. at a controlled rate to minimize latent heat of fusion; and (c) storing the cells in liquid nitrogen vapor phase, thereby cryopreserving the immune cells.

We provide a method of optimizing sialic acid content for a recombinant polypeptide. The method comprises culturing a cell line engineered to express the recombinant polypeptide under conditions that facilitate production of the recombinant polypeptide; and monitoring the cell viability of the cultured cell line on at least one of the seventh day, the eighth day, the ninth day, the tenth day, the eleventh day or the twelfth day of the culture. If the cell viability is at or below a threshold level, the method further comprises stopping the culturing and isolating the recombinant polypeptide after a first predetermined additional time. If the cell viability is above the threshold level, the method further comprises stopping the culturing and isolating the recombinant polypeptide after a second predetermined additional time. The second predetermined additional time is at least about 12 hours longer than the first predetermined time.

The present invention provides methods for collecting desired cells from a sample using countercurrent centrifugal elutriation. The method of the present invention provides a continuous elutriation workflow with optimized conditions, which improves cell purity and retention during the elutriation process. In particular, the methods of the invention use a continuous counter-current centrifugal elutriation process which does not require harvesting cells between elutriation cycles or removal of cells from the separation chamber. The method of the present invention increases the purity, cell number yield, cell recovery, and cell viability of a desired cell population to improve downstream processing. The method of the invention also reduces the volume of buffers and reagents required for the treatment and accelerates the elutriation process, thereby achieving a cost-effective and more efficient cell manufacturing workflow.

The invention relates to the field of application of radix aconiti carmichaeli polysaccharide, and provides novel application of radix aconiti carmichaeli polysaccharide, namely application of radix aconiti carmichaeli polysaccharide in preparation of medicine for treating rheumatoid arthritis. The method comprises the following steps: firstly, culturing MH7A cells in vitro, inducing the MH7A cells through monkshood polysaccharides with different concentrations, and systematically evaluating the regulation effect of the monkshood polysaccharides on the proliferation kinetics and apoptosis rate of the MH7A cells by adopting a cell activity detection kit and combining a flow cytometry analysis technology; it is proved that monkshood polysaccharides with different concentrations can inhibit MH7A cell proliferation and trigger a programmed cell death mechanism, and the monkshood polysaccharides are concentration-dependent. By dynamically monitoring the content of ROS in cells, the monkshood polysaccharide is found to be capable of reducing accumulation of ROS in MH7A cells. In addition, the phosphorylation modification level of NF-kB / P65 protein in MH7A cells and the expression level of TNF-alpha are measured through methods such as a Western Blot method and an ELISA method, and it is also proved that the monkshood polysaccharide can down-regulate the expression of the NF-kB / P65 protein and the TNF-alpha in the MH7A cells. In general, experimental results show that the monkshood polysaccharide has a strong anti-inflammatory effect on MH7A cells.

A method includes placing a sample of cells, tissue, or an organ into an oxygen imaging system, circulating a humidified gas mixture around the tissue or organ, circulating conditioned air through the oxygen imaging system to maintain a temperature around the sample, and acquiring a three-dimensional oxygen map of the sample. The oxygen map provides a quantitative measure of cell viability and functionality.

The present invention includes systems, methods, and compositions for a Geometric Viability Assay (GVA) adapted to measure individual colony-forming units (CPUs) from a diluted sample using one or more variable geometry vessels. The GVA system includes introducing a cell sample to a growth medium: utilizing an axially symmetric variable geometry vessel to incubate the cell sample in the growth medium: and utilizing an imager that is adapted to capture one or more images of the CPUs in the incubated variable geometry vessel.