44 results about "Cellular Microenvironment" patented technology

The invention relates to a class of rhodamine fluorescent probe sensitive to pH change. The fluorescent probe has the following structural general formula, the molecules of the fluorescent probe have a simple synthetic process and better chemical and light stability, fluorescence is sensitive to pH change, and the fluorescent probe has different protein kinase A (pKa) values by introducing different amine groups. Meanwhile, the rhodamine fluorescent probe sensitive to the pH change has very good water solubility and biological compatibility and higher fluorescent quantum yield and has the function of cellular localization. Meanwhile, the pH value of a cellular microenvironment can be detected.

A microfluidic device provides high throughput generation and analysis of defined three-dimensional cell spheroids with controlled geometry, size, and cell composition. The cell spheroids of the invention mimic tumor microenvironments, including pathophysiological gradients, cell composition, and heterogeneity of the tumor mass mimicking the resistance to drug penetration providing more realistic drug response. The device is used to test the effects of antitumor agents.

The invention relates to methods and compositions which utilize the emission of light to monitor changes in microenvironments involving cells. The invention is especially useful for monitoring exocytotic activity such as detecting quantal release of synaptic vesicles. Fusion proteins of Cypridina luciferase and synaptotagmin-I or VAMP / synaptobrevin-2 were targeted to synaptic vesicles and, upon exocytosis, formed light-emitting complexes with luciferin present in the extracellular medium. Photon emissions in the presence of a depolarizing stimulus can be observed with these systems. pH-sensitive mutants of green fluorescent protein are also provided, which are useful for visualizing exocytosis and for imaging and measuring the pH of intracellular compartments.

The invention provides a fluorescent probe based on pyrrole-cumarin dihydrazone derivatives as well as a preparation method and application of the fluorescent probe. The chemical structural formula of the pyrrole-cumarin dihydrazone derivatives is shown in the description. The fluorescent probe based on the pyrrole-cumarin dihydrazone derivatives is prepared by using condensation reaction; the fluorescent probe is simple to synthesize and easy for obtaining raw materials; the fluorescent probe shows higher selective fluorescence identification performance for copper ions in multiple common metal ions, thus enabling the fluorescence of a solution containing the copper ions to be significantly quenched. More importantly, the fluorescent probe also can be used for biological tissues for detecting the fluorescence imaging of the copper ions in cellular microenvironment; the fluorescent probe has the characteristics of being rapid, simple and convenient and high in sensitivity and selectivity as well as wide potential application value.

The invention belongs to the technical field of photothermal reagents, and particularly relates to a photothermal reagent and synthesis thereof and application of serving as the photothermal reagent under the excitation of a near-infrared 808-nm laser.The designed compound has a property of pH sensitivity and can identify tumor cells by responding to a cellular microenvironment.In the tumor cells, the compound in a weak acid environment can serve as the photothermal reagent to achieve a photothermal therapy under the induction of near-infrared light.In normal cells, due to the fact that the normal cells are alkalescent, a photothermal reaction almost does not exist under the induction of the near-infrared light.

The invention discloses a 3D voxel printing device based on cell soft spheres and a method thereof. The device comprises a water phase input part, an oil phase input part and a microfluidic microtube,wherein the water phase input part inputs an extracellular matrix material loaded with cells, namely bio-ink, into the microfluidic microtube; and the oil phase input part synchronously inputs a low-viscosity and low-boiling-point oil phase meeting set requirements into the microfluidic microtube. The extracellular matrix material loaded with the cells is separated into monodisperse microdropletsembedded with the cells through an oil phase, the microdroplets are gelled into cell soft spheres in the flowing process in the microtube, the cell soft spheres are sequentially shot onto a substrateby utilizing rapid expansion and volatilization of the oil phase at an outlet of the microfluidic microtube, and the cell soft spheres are adhered together through an incompletely gelled ink material. An in-vitro model capable of highly reducing the human organ or tissue structure and the cell microenvironment can be printed under the condition that a printing material does not contain a biological inert material for assistance.

The present invention relates to compositions comprising a polymeric matrix or a gel containing functional enzymes capable of re-creating under culture conditions the cell microenvironment existing invivo. The present invention also relates to devices for cell cultures comprising such compositions, in particular hydrogel and the use thereof to control the chemical microenvironment of a cell culture or mimic physiological or pathological conditions of the in vivo cells. The compositions and the devices described herein could be also used in vitro for evaluating the therapeutic effect of a compound on a determined cell line or on primary cells.

The invention provides a preparation method of a double-cell and microenvironment-sensitive anti-tumor drug-loaded nanocapsule. The method comprises the following steps: (1) preparing a thiol hyaluronic acid; (2) preparing vinyl-functional second-generation isopropylidene-protected galactopyranose; (3) grafting the second-generation isopropylidene-protected galactopyranose on the thiol hyaluronic acid; and (4) preparing the drug-loaded nanocapsule. The drug-loaded nanocapsule prepared by the method is high in compatibility with a tumor cell, has dual high-sensitive responsiveness on high-concentration glutathione and acid environment, achieves high-selectivity rapid release in the tumor cell, and is high in anti-tumor efficiency and good in safety.

The present invention relates to a method for scanning a cancer metastasis inhibitor by analyzing the activity of lysyl-tRNA synthetase (KRS) in a cancer cell line cultured in a three-dimensional collagen gel environment, and to a method for monitoring the dissemination of cancer cells from aggregated cancer cells, and the epithelial-mesenchymal transition, migration, invasion, and metastasis of cancer cells. Specifically, it was verified that, in the case where a cell line or a spheroidically aggregated cell line, in which KRS has been regulated to be expressed or unexpressed, was constructed by using various colorectal cancer cells including HCT116 cell line and then cultured in a two-dimensional environment, the incomplete epithelial-to-mesenchymal transition phenotype (incomplete ECM phenotype) was induced in the cell line inhibiting KRS expression, and the inhibition of KRS expression inhibited cell-extracellular matrix (ECM) adhesion and cell-ECM signaling activity. In addition, it was verified that, in the case where the constructed spheroid cell line was cultured in an aqueous environment or a three-dimensional collage gel culture environment, the inhibition of KRS expression induced cells into mesenchymal cells but failed to reach the disintegration of cell-cell adhesion; inhibited the cell-ECM adhesion and the related signaling activity, causing the inhibition of the dissemination of cells from spheroid cells cultured in a three-dimensional collagen gel culture environment; and failed to induce the dissemination of cells through TGFβ1 present in the cellular microenvironment. Thus, the present invention can be used as a method for screening a cancer metastasis inhibitor and a method for monitoring the migration, invasion and metastasis of cancer cells, and will be useful as one of the screening methods capable of creating low-cost, high-efficient added value at the time of pre-clinical tests required for drug development.

The present disclosure relates to a nucleic acid based sensor, comprising a sensing 5 module, a normalizing module and a targeting module. It also relates to a method of obtaining and targeting the sensor and its use to identify and optionally quantify a target in a specific cellular microenvironment.

The invention discloses a preparation method of a cellular microenvironment pH-sensitive micelle. The preparation method comprises the following steps: polymerizing acrylic acid by utilizing an atom transfer radical polymerization method, thus obtaining polyacrylic acid; modifying polyacrylic acid by utilizing folic acid molecules; polymerizing O-tert-butyl-L-threonine carboxylic acid anhydride by utilizing a ring opening polymerization method, thus obtaining poly(O-tert-butyl-L-threonine); grafting adriamycin onto poly(O-tert-butyl-L-threonine) via hydrazone bonds; connecting polyacrylic acid with poly(O-tert-butyl-L-threonine) with bonds through click chemistry, thus obtaining block copolymers; after dissolving the block copolymers in tetrahydrofuran respectively, transferring the solutions into a dialysis bag, dialyzing the solutions with pure water, and filtering the dialysate with a filter membrane; freeze-drying the solutions after filtration, thus obtaining a drug loading micelle. The drug carrier micelle has a core / shell double-layer structure, wherein the outer layer is formed by hydrophilic polyacrylic acid, and the inner layer is a drug molecule coated layer. The material has the advantages that the material belongs to nanoparticles; the drug can achieve targeting delivery of cancer cells and pH-sensitive release in the cancer cells; the material has high drug loading capacity and good stability; the toxic and side effects of the drug on normal tissues and organs can be effectively reduced via the targeting function of the drug.

According to the vascularization bone cell sheet scaffold complex and the preparation method thereof, a method for co-culturing osteoblast cells and angiogenic cells is adopted, through a cell sheet technology, the loss of extracellular matrixes caused by a traditional cell digestion technology is eliminated, the original cell microenvironment is reserved, and the cell sheet scaffold complex has the advantages that the cell sheet scaffold complex is simple in structure and convenient to use. Through the synergistic effect of osteogenesis and vascularization, the survival and outcome of osteoblasts in the bone tissue engineering scaffold are facilitated; furthermore, the organic combination of the 3D printing bone tissue engineering scaffold and the cell sheet solves the problems that a pure cell sheet is low in strength and cannot maintain an osteogenesis space.

The invention discloses a preparation method of composite hydrogel, and a construction method of a cell microenvironment bionic system. The preparation method of the composite hydrogel comprises the following steps: mixing a gelatin solution, a sodium alginate solution, a glycerin solution, a glutaraldehyde solution, a phosphate buffer salt solution and a sterile aqueous solution according to a preset volume ratio to obtain a precursor solution the glycerol volume concentration being 1-5%; freezing the precursor solution to convert gelatin from sol to gel, and freezing glycerol to form pores; and adding a calcium chloride solution to carry out ionic crosslinking on sodium alginate in the gel to obtain the composite hydrogel, wherein the concentration of calcium chloride is associated with the rigidity of the composite hydrogel. The composite hydrogel prepared by the embodiment of the invention is good in forming, stable in mechanical property and uniform in pore structure, and can be used for simulating an extracellular matrix microenvironment in vitro.

The invention belongs to the technical field of materials, and relates to a preparation and application of cobalt-doped metal organic framework nanoparticles, and the cobalt-doped metal organic framework nanoparticles have good hydroxyl radical generation capability and good drug loading performance. Doped cobalt metal ions enable the nucleation number in a reaction system to be increased, the concentration of relative ligands is greatly consumed, polyvinylpyrrolidone is used as a stabilizer, the nano-particles are protected and dispersed, the nanoparticles stop growing in a small size, and therefore synthesis of small-size CoZn-MOF-5 materials is achieved. The nanoparticle material is small in size, good in dispersity and high in loading capacity, and can be sensitively controlled to be released under the high glutathione expression acidic tumor cell microenvironment, meanwhile, cobalt ions doped in the material can react with hydrogen peroxide overexpressed by tumor cells to generate hydroxyl free radicals, the coordination of a chemical kinetic therapy and a chemical therapy is realized, and the cobalt-doped metal organic framework nanoparticles are a good nano anti-cancer drug carrier.

The invention relates to a biochemical detection instrument. The invention aims to provide a rapid, accurate and automatic detection system for realizing the trace volume of a large number of ROS content samples aiming at cell, tissue and organ microenvironments such as pleural fluid, peritoneal fluid, cerebrospinal fluid, amniotic fluid, follicular fluid, cell culture fluid and the like. The technical scheme is as follows: the active oxygen content automatic detection system suitable for a cell microenvironment is characterized in that the automatic detection system comprises a sample transmission reaction system, a detection system, a washing system communicated with the sample transmission reaction system through a water pipe pipeline and a purging system communicated with the sample transmission reaction system through an air pipe pipeline, wherein the sample transmission reaction system and the detection system are sequentially communicated through a light shielding pipeline; thesample transmission reaction system comprises a sample injector and a DCFH supply bin which are connected in parallel and then communicated with a reaction bin through a light shielding pipeline; andsample injection valves are respectively arranged between the sample injector and the reaction bin and between the DCFH supply bin and the reaction bin.

The invention discloses preparation and application of polyelectrolyte-coated drug-loaded Gd2O3@mesoporous silica nanoparticles, and relates to the technical field of medicinal chemistry. The preparation method comprises the following steps: loading synthesized Gd2O3 nanoparticles on mesoporous walls of MSN by adopting a one-step method, removing a synthesis template CTAB by adopting a calcination method, loading DOX in mesopores of MSN by utilizing an ultrasonic oscillation method, coating the surface of MSN with a pH responsive substance PAH / P (DMA-co-TPAMA) by using an LBL method, connecting folic acid to the outermost layer of the coating material to serve as a targeting agent, and therefore the pH responsive polyelectrolyte-coated drug-loaded Gd2O3@mesoporous silica nanoparticles are prepared and have the cancer cell targeting property, the cancer cell microenvironment response drug controlled release property and the MRI contrast agent enhancement effect, and the purposes of diagnosis and treatment integration, anti-cancer drug tracing, real-time curative effect monitoring and the like are achieved.

The invention discloses a membrane protein dimerization state in-situ detection kit and application thereof. The kit includes a membrane protein anchor chain, an identification probe and a SERS label. Proximity hybridization of strands upon membrane protein dimerization triggers catalytic hairpin self-assembly to form a networked assembly of recognition probes and SERS tags, enabling SERS detection of a highly specific event in cell communication, membrane protein dimerization With imaging, it is suitable for high-sensitivity monitoring of membrane protein dimerization-based intercellular signaling in complex cellular microenvironments.

The invention discloses a dynamic cell microenvironment simulation platform and a preparation method thereof. The platform takes hydrogel as a cell culture carrier, and can selectively regulate and control the combination and dissociation of one or more ligands in the hydrogel and a cross-linked network structure of the hydrogel in real time, wherein the ligands are proteins and polypeptides with specific structures determined according to the types of cells and receptor types expressed by the cells, and are modified in the hydrogel based on a DNA hybridization principle, so that a dynamic cell microenvironment is simulated in vitro, and the platform can be used for regulating and controlling the interaction between the cells and the microenvironment. The platform is simple in preparation method, easy to operate and good in biocompatibility, and meanwhile, the physical and chemical properties in a biological environment are stable.

The invention discloses an Ac-SDKP-LDH nanocrystallization preparation as well as a preparation method and application thereof. The Ac-SDKP-LDH nanocrystallization preparation comprises LDH and Ac-SDKP inserted between LDH layers and is prepared through the following steps that the LDH and the Ac-SDKP are fully mixed and react at the temperature of 2-8 DEG C for 8-24 h, the Ac-SDKP is inserted between the LDH layers through ion exchange, and the Ac-SDKP-LDH nanocrystallization preparation is obtained. The Ac-SDKP-LDH nanocrystallization preparation disclosed by the invention can be used for preparing anti-silicofibrosis medicines. The method for preparing the Ac-SDKP-LDH nanocrystallization preparation is simple and easy to operate, and according to the prepared Ac-SDKP-LDH nanocrystallization preparation, under the action of a cell microenvironment, a cationic laminate of LDH dissolves in inorganic metal ions, so that the Ac-SDKP is released, the effect of protecting the Ac-SDKP is achieved, the anti-EMT effect can be sufficiently exerted, and the Ac-SDKP-LDH nanocrystallization preparation is used for preventing and treating silicosis fibrosis and has the medicine controlled release characteristics of long lasting time, high biological safety and pH sensitivity. In addition, the LDH has a certain anti-fibrosis effect, and the anti-fibrosis effect of the LDH is enhanced by compounding the LDH and the Ac-SDKP.

The invention relates to a method for detecting the influence of cigarette smoke on the expression quantity of aquaporin 5 (AQP-5) cells, and belongs to the technical field of biological application. According to the method, biochemical and cytological methods are used, BMP6 is used to process the cells, and the cellular microenvironment when sjogren syndrome happens is simulated so as to study the influence of cigarette smoke on the expression quantity of AQP-5; compared with animal experiments, the method is simpler and more efficient; an oral cavity biomimetic-simulation device is used for collecting cigarette smoke, which is closer to the actual state of human smoking; meanwhile, a high content system is used and can detect the influence of multiple samples on the expression quantity of the AQP-5 cells in a high flux, the multi-sample detection can be conducted rapidly, accurately and visually, and a novel rapid means is provided for the efficiency evaluation of cigarette smoke.

The invention provides an achilles tendon repair patch and a preparation method thereof.The achilles tendon repair patch comprises a flaky SIS matrix, tendon stem cells are planted on the SIS matrix, the achilles tendon repair patch takes the flaky SIS matrix as a biological scaffold and the tendon stem cells as seed cells, has good biocompatibility and strong tendon differentiation capacity, and can be used for repairing achilles tendons. The sheet-shaped SIS matrix can wrap the achilles tendon broken end during tendon repair, so that adhesion between surrounding soft tissues and the achilles tendon broken end is isolated, meanwhile, the tendon stem cells carried by the sheet-shaped SIS matrix are accurately attached to the broken end, a good cell microenvironment is provided for proliferation and migration of the tendon stem cells, and a good achilles tendon repair effect is achieved.