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42results about How to "Maintain biological function" patented technology

Low-expression CYP7A1 hepatic cell and constructing method thereof

The invention discloses a low-expression CYP7A1 hepatic cell and a constructing method thereof. A method for inhibiting the CYP7A1 expression level of the hepatic cell comprises the step of introducing an encoding gene of small-interference RNA which is used for inhibiting the CYP7A1 gene expression into the hepatic cell so as to inhibit the CYP7A1 expression level of the hepatic cell. A slow virus vector system can be used for introducing the encoding gene of small-interference RNA which is used for inhibiting the CYP7A1 gene expression into the hepatic cell. An experiment proves that the method of the invention can obviously regulate the expression level of the CYP7A1 gene of the hepatic cell in an mRNA level and a protein level downwards and can further effectively reduce the secretoryvolume of total bile acid. The Low-expression CYP7A1 hepatic cell and the constructing method thereof can be used for the fundamental research and the clinical application of biologic artificial liver supporting treatment and have a wide application prospect.
Owner:FIELD OPERATION BLOOD TRANSFUSION INST OF PLA SCI ACAD OF MILITARY

Low-temperature preserved solid culture medium of skin model and preservation method of low-temperature preserved solid culture medium

ActiveCN104222068ANormal physiological environmentNormal growth environmentDead animal preservationCulture fluidCuticle
The invention discloses a low-temperature preserved solid culture medium used for a tissue engineering skin model and a preservation method of the low-temperature preserved solid culture medium. The low-temperature preserved solid culture medium is prepared by the following steps: adding a low-temperature protection agent into a common culture medium for epidermis cells to prepare a basic culture solution; and mixing the basic culture solution with agarose gel and condensing to form the solid culture medium suitable for the skin model. The tissue engineering skin model is embedded into the culture medium, is preserved at 4-8 DEG C for 24-72 hours, and then is resuscitated by a common epidermis cell culture solution. The solid culture medium can be used for reducing tissue activity reduction and structure damages of cells and skin tissues, caused by a low-temperature preservation condition, to the greatest extent.
Owner:GUANGDONG BOXI BIO TECH CO LTD

Compound active amnion material, preparation method and application thereof and compound active amnion uterine cavity repair stent

The invention provides a compound active amnion material, a preparation method and application thereof and a compound active amnion uterine cavity repair stent. The preparation method comprises the following steps: (1) providing a collagen sponge prepare liquid or a compound collagen sponge prepare liquid; (2) providing an amnion with both an epithelial layer and a basement membrane; (3) pouring and coating the prepared prepare liquid on the basement membrane of the amnion to enable the basement membrane and the prepare liquid to be subject to crosslinking, and then preparing the compound active amnion material through freeze drying. The compound active amnion material not only keeps the complete structure and the due biological function of the amnion but also endow the amnion with a certain rigidity, so that the compound active amnion material has stronger maneuverability in application after TCRA (Transcervical Resection Of Adhesions) operation; the compound active amnion uterine cavity repair stent integrates the compound active amnion material and a saccule at the front end of a pipe body, the saccule expands under the action of an external force to push out the compound active amnion material, and then the compound active amnion material is successfully attached to the inner wall of the uterine cavity; the stent is convenient to take out and prevents secondary damage.
Owner:JIANGXI RUIJI BIOTECH CO LTD

Method for preparing porcine hepatocyte and mesenchymal stem cell co-microencapsulated internal bio-artificial liver

The invention relates to a method for preparing a porcine hepatocyte and mesenchymal stem cell co-microencapsulated internal bio-artificial liver. The invention comprises the following steps: establishing an in-vitro culture amplification system for porcine mesenchymal stem cells, performing in-situ perfusion separation of porcine primary hepatocytes by a two-step collagenase method, and preparing alginate-poly-L-lysine microencapsulated hepatocytes and mesenchymal stem cells. The invention overcomes the defects that internal cells usually can not survive for a long time; the proliferation ability is quite limited; and the function of the injected hepatocytes for generating various stimulating factors for promoting liver regeneration is inhibited. The invention introduces mesenchymal stem cells into an internal bio-artificial liver system, fully simulates the in-vivo microenvironment of hepatocytes by heterogeneous intercellular interaction, effectively prolongs the survival time of hepatocytes, promotes the proliferation and differentiation of hepatocytes, maintains the specific biological functions of hepatocytes, and thus significantly improves the efficacy of the internal bio-artificial liver on treating hepatic failure.
Owner:THE AFFILIATED DRUM TOWER HOSPITAL MEDICAL SCHOOL OF NANJING UNIV

DMSO-free human umbilical cord mesenchymal stem cell injection cryopreservation liquid

The invention discloses a DMSO-free human umbilical cord mesenchymal stem cell injection cryopreservation liquid, which is characterized by being prepared from the following raw materials in parts by volume: 50 to 60 parts of compound electrolyte injection, 20 to 40 parts of dextran 40 glucose injection, 1 to 10 parts of sodium chloride injection, 1 to 10 parts of glucose injection, 30 to 50 parts of human serum albumin, and 1 to 10 parts of a mesenchymal stem cell serum-free medium. The cryopreservation liquid does not contain DMOS or serum, so that the risk of clinical use is reduced, the influence of the uncertainty of serum components and the instability of serum culture on the normal induced differentiation function of the mesenchymal stem cells is avoided, and the cryopreservation liquid enables the human umbilical cord mesenchymal stem cells to keep a good cryopreservation effect, and the human umbilical cord mesenchymal stem cells have high survival rate after cryopreservation and resuscitation. In addition, the cells cryopreserved by the cryopreservation liquid can be directly diluted and then applied clinically, components of the cryopreservation liquid do not need to be removed through centrifugation, and the cryopreservation liquid can be used as an auxiliary material and directly applied to clinical administration, so that the cryopreservation liquid is more convenient to use.
Owner:朱灏

Modified polyethylene glycol superoxide dismutase (mPEG-SOD) nanoemulsion capable of being directly externally used for skin and preparation method thereof

The invention discloses modified polyethylene glycol superoxide dismutase (mPEG-SOD) nanoemulsion capable of being directly externally used for skin and a preparation method thereof. The mPEG-SOD nanoemulsion is prepared from the following raw materials in part by weight: 7 parts of isopropyl myristate, 30 parts of caprylocaproyl macrogolglycerides, 10 parts of polyglyceryl-3-dioleate, 50 parts of mPEG-SOD aqueous solution and 3 parts of vitamin E. The mPEG-SOD nanoemulsion solves the problem that the SOD has low stability, is easy to deactivate, and has poor penetrability for external application to the skin. The modified polyethylene glycol superoxide dismutase (mPEG-SOD) nanoemulsion capable of being directly externally used for the skin is a preparation with good stability and capacity of persistently protecting the bioactivity of the SOD, and can quickly penetrate the skin so as to greatly improve the biological effect of the SOD. The preparation method has the advantages of simple preparation process, easy actual operation, no need of special instrument and equipment, and high-efficiency and quick preparation.
Owner:董萍 +1

Serum-free medium for porcine hepatocytes and preparation method of serum-free medium

The invention relates to a serum-free medium for porcine hepatocytes and a preparation method of the serum-free medium. According to the serum-free medium for the porcine hepatocytes, a basic culture solution is added with the following components: 10.00mg / L of bovine insulin, 5.50mg / L of human transferrin, 5.02mg / L of sodium selenite, 2.00mg / L of ethanol amine, 196.26mug / L of dexamethasone, 0.5mg / L of fibronectin, 10.00mg / L of vitamin C, 60.00mug / L of hepatocyte growth factors, 80.00mug / L of epidermal growth factors, 2.00mg / L of glucagon and 1.50g / L of bovine serum albumin. The serum-free medium for the porcine hepatocytes is capable of being used for culturing porcine primary hepatocytes, the porcine primary hepatocytes are very equivalent to that cultured by a serum-containing medium in form and vigor and the growth condition is obviously good; the original biological characteristics and biological functions of the porcine hepatocytes can be well kept; the negative effects caused by a traditional serum-containing medium can be avoided; the condition requirements of normal growth and division and proliferation of the hepatocytes can be met.
Owner:SHAOGUAN COLLEGE

Refined manufacturing of photo-control-hybridized cross-linked degradable support and bone tissue engineering application of photo-control-hybridized cross-linked degradable support

The invention belongs to the technical field of biomaterials and particularly relates to refined manufacturing of a photo-control-hybridized cross-linked degradable support and bone tissue engineeringapplication of the photo-control-hybridized cross-linked degradable support. A method for preparing the photo-control-hybridized cross-linked degradable support comprises the steps: 1) preparing modified hydroxyapatite; 2) preparing a bonder GelMA; and 3) blending a blue-light initiator and a thickener to prepare slurry, subjecting double bonds in the GelMA and double bonds of silane-coupler-modified grafted hydroxyapatite to an interaction, i.e., a formula shown in the description in the presence of free radicals through 3D printing technique forming under the condition of illumination of specific wavelength, then, initiating monomer polymerization, and carrying out bonding, thereby forming the solid-phase hybridized degradable support. The invention relates to application of the osteogenesis-remediation-promoting photo-crosslinked composite 3D-printed hybridized degradable support as a drug carrier or / and a bioscaffold material. The support is scientific in design and simple and convenient in operation and can be applied to carrier support materials of bone-defected regenerated remediation or all classes of bioactive substances due to refined controllable processing characteristics and biodegradable characteristics.
Owner:SICHUAN UNIV

Ultra-low temperature preservation solution for animal cells and preserving method

The invention discloses a ultra-low temperature conserving solution of animal cell and conserving method thereof for conserving cell especially fresh separated primary animal cell, e.g. liver cell. Culturing fresh separated animal cell at 37 DEG C 0-24 h, changing culture medium as ultra-low temperature conserving solution at 0-4 DEG C then conserving 0-48 months at -80--196 DEG C. After conserving finished, recoverying culturing in a fresh cell culture medium at 37 DEG C, finally culturing in a normal animal cell culture medium. Adding Chinese medicine effective constituent and other chemical protective agent in conserving process and before and after culture medium to improve survival rate of animal cell after conserving at ultra-low temperature and function of cell. The ultra-low temperature conserving technique of separated animal cell is used for conveying and conserving biotype artifical organs in consist of biology artifical liver and other organ cell, also suit for application of animal cell in other medicine field.
Owner:ZHEJIANG UNIV

Culture method of mouse lung organs and special culture solution thereof

PendingCN113151152AEffective maintenance of interactionsMaintain heterogeneityCulture processArtificial cell constructsStainingImmunofluorescent stain
The invention discloses a culture method of mouse lung organs and a special culture solution thereof. The method comprises the following steps: acquiring fresh mouse lung tissue cells, digesting into single cells by collagenase, culturing mouse lung tissue organoid under an in-vitro three-dimensional culture condition, and performing immunofluorescent staining on the lung organoid. The culture solution is prepared from ADF < + + + + >, an RPSO1 conditional culture medium, a Noggin conditional culture medium, a B27 additive, N-acetyl-L-cysteine, nicotinamide, Y-27632, A83-01, SB202190, a recombinant human fibroblast growth factor-7 and a recombinant human fibroblast growth factor-10. Experiments show that the lung organ established by the method disclosed by the invention can effectively maintain tissue cell specificity, stem cell characteristics and biological functions, and meets the requirements of scientific research.
Owner:ACADEMY OF MILITARY MEDICAL SCI

Culture and cryopreservation method of amniotic mesenchymal stem cells

The invention relates to a culture and cryopreservation method of amniotic mesenchymal stem cells. The culture method comprises amniotic tissue separation, amniotic mesenchymal stem cell separation, P0 generation amniotic mesenchymal stem cell culture and amplification culture. According to the culture method of the amniotic mesenchymal stem cells, at a separating stage of the amniotic mesenchymalstem cells, a special mixed enzyme digestive juice system (the final concentrations of components in the digestive juice are as follows: 1.5-2U / mL of neutral protease, 0.5mg / mL of deoxyribonuclease Iand 1mg / mL of collagenase IV) is adopted for digestion, so that the amniotic mesenchymal stem cells can be more effectively separated from amniotic tissues, and then the yield of P0 generation cellsis obviously improved. Compared with conventional two-step digestion, the culture method provided by the invention has the advantages that a one-step digestion method is adopted, operation is more convenient, and the cultured amniotic mesenchymal stem cells have good activity, high yield, high purity and good repeatability.
Owner:赛瑞诺(北京)生物科技有限公司

Stem cell cryopreservation liquid as well as preparation method and application thereof

The invention discloses a stem cell cryopreservation solution as well as a preparation method and application thereof. The cryopreservation liquid is prepared from the following components in percentage by volume: 20 to 40 percent of a basic culture medium, 10 to 20 percent of glycerol, 30 to 60 percent of human serum albumin, 2 to 6 percent of trehalose, 0.5 to 2 percent of glycine or taurine and 6 to 10.5 percent of inositol galactoside or glycoside. According to the cryopreservation liquid, the serum-free cryopreservation liquid is adopted for cryopreservation of the stem cells, the cells are free of damage, the possibility of animal pathogen pollution can be reduced, the inositol galactoside or the glycoside serves as the stabilizer, the cell phenotype can be effectively protected, the activity of the stem cells under the cryopreservation condition can be remarkably improved, and therefore, the physiological function and the biological function of the recovered cells are maintained.
Owner:东莞再立健生物科技有限公司

Human umbilical cord mesenchymal stem cell injection cryopreservation liquid with high multiplication capacity

The invention discloses a human umbilical cord mesenchymal stem cell injection cryopreservation solution with high multiplication capacity, which is prepared from the following raw materials in parts by volume: 1 to 5 parts of DMSO, 45 to 55 parts of compound electrolyte injection, 5 to 15 parts of dextran 40 glucose injection, 1 to 10 parts of sodium chloride injection, 1 to 10 parts of glucose injection, 20 to 40 parts of human serum albumin, and 3 to 6 parts of a serum substitute. The invention further discloses a preparation and cryopreservation method of the human umbilical cord mesenchymal stem cells, the content of DMOS is reduced, so that the clinical use risk is reduced, the human umbilical cord mesenchymal stem cells still keep a good cryopreservation effect, the human umbilical cord mesenchymal stem cells have high survival rate after cryopreservation and resuscitation, and meanwhile, the high value-added ability is kept. The proliferation capacity of unfrozen and resuscitated cells after 6 months of cryopreservation in the refrigerating fluid is equivalent to the proliferation capacity of fresh cells, and is far higher than the proliferation capacity of unfrozen and resuscitated cells after 6 months of cryopreservation in traditional refrigerating fluid.
Owner:朱灏

Preparation method of human umbilical cord mesenchymal stem cell injection cryopreservation liquid

The invention relates to the technical field of cryopreservation liquid preparation, in particular to a preparation method of a human umbilical cord mesenchymal stem cell injection cryopreservation liquid. The preparation method of the human umbilical cord mesenchymal stem cell injection cryopreservation liquid at least comprises the following steps: adding a glucose injection, a sodium chloride injection, dextran and a compound electrolyte injection into dimethyl sulfoxide, and uniformly mixing; and then adding the human serum albumin, and uniformly mixing to obtain the cryoprotectant. The preparation method of the human umbilical cord mesenchymal stem cell injection cryopreservation liquid is optimized, so that the prepared cryopreservation liquid has high stability, no floccules or precipitates are generated in the preparation process and after the preparation process is completed, the functional indexes and biological functions of human umbilical cord mesenchymal stem cells are maintained, and the safety and the biocompatibility of the human umbilical cord mesenchymal stem cell back transfusion to a human body are improved.
Owner:朱灏

Invitro tissue cultivation method of hepatocyte of mammal

The invention relates to an invitro tissue cultivation method of hepatocyte of a mammal, adopting a hepatocyte culture medium with a three-dimensional porous structure of static tissue. The medium has a diameter of 1-2mm and a thickness of 3-4mm; the medium is provided with holes differing in size, wherein the diameter of the hole ranges from 80mum-500mum, and holes are communicated with each other. The method ensures that the hepatocyte of human or animal is rapidly multiplied during culture in vitro and keeps the cell biology and function of the hepatocyte cell.
Owner:苑国忠

A kind of magnesium-based metal material conversion film and preparation method thereof

The invention discloses a magnesium-based metal material conversion film and a preparation method thereof. The conversion film is mainly composed of a polyphenol organic conversion layer on the surface of a magnesium base material. The preparation method is as follows: (1) pretreatment of the magnesium metal substrate, followed by sandpaper polishing, NaOH activation, dopamine soaking, etc.; (2) cleaning the pretreated sample with deionized water at room temperature, and immersing it in polyphenolic compound and magnesium After reacting in the mixed salt solution for 2-15 minutes, ultrasonically clean with ethanol to complete a reaction cycle; repeat the reaction cycle 3-5 times to obtain a magnesium-based metal material conversion film. The conversion film prepared by the preparation method of the present invention can effectively solve the technical problems of low structural stability and poor long-term corrosion resistance of the conversion film, and the polyphenolic compound helps to capture excess active oxygen in the body and protect the body from attacked by reactive oxygen species. The conversion coating can be applied to the surface modification research of fully degradable magnesium-based metal cardiovascular stents and fully degradable magnesium-based orthopedic filling materials.
Owner:SICHUAN UNIV

In-vitro separation and culture method of sustentacular cell of Mongolian horse

The invention provides an in-vitro separation and culture method of a sustentacular cell of Mongolian horse. The method comprises the steps of tissue dissociation and washing, tissue digestion, cell inoculation, cell culture and maintenance and the like. According to the method, the whole testicular tissue of a large-sized mammal Mongolian horse is subjected to tissue separation and culture so asto acquire the sustentacular cell. The method is simple in procedure and low in cost, can be used for effectively removing aggregate tissues generated in an enzyme digesting process, so that the activity and biological functions of the cell can be maintained; and impure cells generated in the separation and culture process can be effectively removed, the sustentacular cell separation efficiency can be improved, and foundation is provided to subsequent germ cell researches.
Owner:INNER MONGOLIA AGRICULTURAL UNIVERSITY

T lymphocyte cryopreservation solution

The invention discloses a T lymphocyte cryopreservation solution, which is prepared from the following raw materials by volume: 1-5 parts of DMSO, 5-15 parts of dextran 40 glucose injection, 40-60 parts of compound electrolyte injection, 20-40 parts of human serum albumin and 5-15 parts of Dulbecco's medium or Dulbecco's modified medium. The invention also discloses a preparation method and a cryopreservation method thereof, the content of DMOS is reduced, so that the clinical use risk is reduced, the T lymphocyte still keeps a good cryopreservation effect, and the T lymphocyte has high survival rate and keeps a better form after cryopreservation and resuscitation. Besides, in the preparation process, the phenomenon that the human serum albumin generates protein precipitation when encountering DMSO is also solved, cells cryopreserved by the cryopreservation solution can be directly diluted and then applied clinically, components of the cryopreservation solution do not need to be centrifugally removed, and the cryopreservation solution can be used as an auxiliary material and is directly applied to clinical administration, so that the cryopreservation solution is more convenient to use.
Owner:朱灏

Methods and system for amplifying bone marrow mesenchymal stem cells, and computer readable medium

The invention relates to methods and system for amplifying bone marrow mesenchymal stem cells, and a computer readable medium. The method includes performing induction culturing on bone marrow mesenchymal stem cells for 1-3 days under conditions that temperature is at 36-38 DEG C, the volume concentration of N2 is 91-93%, the volume concentration of air is 1%, the volume concentration of CO2 is 4.5-5.5% and the volume concentration of O2 is 1.5-2.5%; and performing continuous culturing on the induction-cultured bone marrow mesenchymal stem cells under the conditions that the temperature is at36-38 DEG C, the volume concentration of CO2 is 4.5-5.5% and the volume concentration of O2 is 15-25% so as to amplify the bone marrow mesenchymal stem cells. The method can rapidly amplify the bone marrow mesenchymal stem cells and obtain the bone marrow mesenchymal stem cells with the best proliferative capacity, biological activity and endothelial differentiation function.
Owner:SOUTH CHINA INSTITUDE OF BIOMEDICINE +1

Double-layer cell co-culture device with adjustable gap

The invention discloses a double-layer cell co-culture device with an adjustable gap. The double-layer cell co-culture device comprises a cell culture box, a cell culture groove and a driving part, wherein the cell culture box is used for culturing a first cell; the cell culture groove is used for culturing a second cell, and is arranged in the cell culture box in a removable manner; and the driving part drives the cell culture groove to move to the bottom of the cell culture box in the cell culture box, and can adjust the gap between the bottom of the cell culture box and the bottom of the cell culture groove to the predetermined distance. According to the double-layer cell co-culture device provided by the invention, the driving part drives the cell culture groove to move to the bottom of the cell culture box, and thus, the distance between the double layers of cells is adjusted in an on-line manner, the gap can adjust the growth and the function of the cells, so that the adjustable growing environment is provided for cell co-culture, and the feasible device is provided for exploring a cell co-culture technology.
Owner:INST OF MECHANICS - CHINESE ACAD OF SCI

Degradable compound active amnion material, preparation method and application thereof and compound active amnion uterine cavity repair stent

The invention provides a compound active amnion material, a preparation method and application thereof and a compound active amnion uterine cavity repair stent. The preparation method comprises the following steps: (1) providing a collagen sponge prepare liquid or a compound collagen sponge prepare liquid; (2) providing an amnion with both an epithelial layer and a basement membrane; (3) pouring and coating the prepared prepare liquid on the basement membrane of the amnion to enable the basement membrane and the prepare liquid to be subject to crosslinking, and then preparing the compound active amnion material through freeze drying. The compound active amnion material not only keeps the complete structure and the due biological function of the amnion but also endow the amnion with a certain rigidity, so that the compound active amnion material has stronger maneuverability in application after TCRA (Transcervical Resection Of Adhesions) operation; the compound active amnion uterine cavity repair stent integrates the compound active amnion material and a saccule at the front end of a pipe body, the saccule expands under the action of an external force to push out the compound active amnion material, and then the compound active amnion material is successfully attached to the inner wall of the uterine cavity; the stent is convenient to take out and prevents secondary damage.
Owner:JIANGXI RUIJI BIOTECH CO LTD

Preparation method of recombinant Fas-associated death domain protein and application thereof

The invention belongs to the technical field of biology, in particular to a preparation method of full-length Fas-associated death domain (FADD) protein, which utilizes a recombinant DNA technique to express and prepare the full-length FADD protein which has good stability, high yield, the same high-level structure as a wild FADD and activity for inducing cell apoptosis, and the preparation method has more convenient and faster separation and purification process and high yield. The full-length FADD protein can be applied to prepare a medicament for inducing the cell apoptosis and treat diseases such as tumors, rheumatoid arthritis, and the like. The invention also provides an expression method for expressing the full-length FADD protein in a prokaryotic expression system, which can effectively improve the yield of the full-length FADD protein.
Owner:NANJING UNIV
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