247 results about "Mdck cell" patented technology

The invention relates to the culture medium research and development technical field of modern biological technology and provides a serum-free medium for MDCK cell large-scale adherent culture and single-cell suspension culture, which comprises 21 amino acids, 6 vitamins, 8 salts, 8 lipids, 4 trace elements, 2 buffers, 1 protein hydrolysate, 1 acid-base indicator and 6 other additives. The serum-free medium can be prepared by the conventional preparation method, and an application method thereof is the conventional method. The serum-free medium has the beneficial effects that: the serum-free medium does not contain serum, has clear components, is beneficial for separating and purifying the product and improves the product quality; the serum-free medium supports long-term subculture of MDCK cells and does not require long-term and complex adaptation process; and the serum-free medium can well support the adherent growth and single-cell suspension growth of the MDCK cells, has clear components and easy preparation and utilization, and is suitable for mass production of biological products.

The invention discloses a preparation method of an avian influenza virus suitable for growing in a serum-free full-suspended cultured MDCK cell line and the avian influenza virus obtained through the method. The preparation method comprises the following steps of 1 preparation of the MDCK cells to be inoculated; 2 virus seed preparation, wherein a chick embryo source avian influenza virus is prepared; 3 F1 generation virus domestication; 4 F2 generation virus domestication, wherein a supernatant sample retained at the time point when the blood clotting titer of the avian influenza virus obtained in the F1 generation is highest is taken, and the step 3 is repeated; 5 F3 generation virus domestication, wherein the F3 generation virus culturing temperature is 35 DEG C; 6 F4 generation-F10 generation virus domestication, wherein the step 5 is repeated, and the domesticated avian influenza virus is obtained. According to the preparation method, through a domestication method, the avian influenza virus is directly domesticated to completely adapt to be efficiently reproduced on the serum-free full-suspended cultured MDCK cells from the mode of being cultured by a chick embryo, the domestication efficiency is high, the avian influenza virus can be efficiently infected and copied in the MDCK cells, and the virus characteristic is stable.

The invention relates to a method for industrially producing animal influenza vaccine by using a bioreactor, comprising the following steps of: (1) adding Vero or MDCK cells in the sterilized bioreactor containing a micro-carrier and culturing in a serum-including culture medium; (2) replacing the culture medium including serum in the bioreactor by a serum-free culture medium which includes pancreatin; (3) inoculating animal influenza virus to culture continuously; (4) harvesting to obtain a cell-cultured influenza virus stock solution when the pathological change of the cells is up to 80%; and (5) hyper-filtering, concentrating and inactivating the influenza virus stock solution and then adding an adjuvant to obtain the influenza inactivated vaccine. The method provided by the invention has the advantages of controllable process parameters, high cell density, high virus titer, high production efficiency, low labor intensity and the like. The influenza vaccine produced by the invention has good security, stable and reliable quality, small side reaction and high immune effect and has a better immune protection function for the attack of the influenza virus.

The invention discloses a method for preparing an MDCK (Madin-Darby canine kidney) cell line adaptive to serum-free full-suspension culture and the MDCK cell line. The method includes steps of 1), discarding culture media for cultivating MDCK cells, cleaning cell layers by the aid of pancreatin solution, then discarding the pancreatin solution, adding pancreatin solution into the MDCK cells again, digesting the MDCK cells, stopping digesting the MDCK cells after the cells are rounded, centrifuging cell suspension and then discarding supernatant to obtain cell clusters; 2), re-suspending the cell clusters obtained at the step 1) by the aid of serum-free culture media to obtain cell re-suspension; 3), arranging the cell re-suspension obtained at the step 2) in a shaking table, cultivating the cell re-suspension in culture tanks, diluting the cell re-suspension by the aid of the serum-free culture media and carrying out passage on the cell re-suspension to obtain the MDCK cell line. The method and the MDCK cell line have the advantages that the MDCK cell line is high in cell density and activity and uniform in size, individually grows in a dispersion manner, is plump in form and is suitable for serum-free suspension culture by the aid of bioreactors.

The invention provides a serum-free culture medium used for full-suspension culture of MDCK (Madin Darby Canine Kidney) cells. The culture medium is prepared from a DMEM/F12 culture medium containing 5g/L of NaCl and the following components: sodium stannite, recombinant human epidermal growth factors, hydrocortisone, recombinant full-chain insulin, prostaglandin E1, human transferrin, thyroxine (T3), vitamin E, cholesterol, ethanol amine, beta-mercaptoethanol, Tween-80, Hypep1510, recombinant human serum albumin ACF and mannitol. With the adoption of the culture medium provided by the invention, the full-suspension culture of the MDCK cells can be carried out very well under the condition that serum is not added; after the MDCK cells are continuously cultured for 20 generations, the average proliferation concentration of the MDCK cells is 2.308*10<6>/mL, the average cell viability is 97.4 percent and the average doubling time is 34.48 hours, so that the serum-free culture medium provides technical supports for developing influenza vaccines of cell matrixes of mammals in China.

A method for producing influenza virus on large scale is provided. A method for propagating influenza virus which comprises, after removing or decreasing a trypsin inhibitor secreted into culture of MDCK cells (cell line derived from dog kidney) by washing with a culture medium or a buffer, inoculating influenza virus into said cells and culturing said influenza virus-inoculated cells in a culture medium supplemented with trypsin.

The invention discloses a production method for vaccines of avian influenza virus and other influenza virus such as swine influenza, dog influenza and equine influenza, which comprises the following steps of: (1) transfer of culture and cultivation of vaccine-made cells; (2) reproduction of vaccine-made virus seeds; (3) microcarrier suspension culture of MDCK cells in a bioreactor; (4) reproduction of vaccine-made virus liquid; and (5) harvest of the virus liquid. The production method has the advantages of reducing the production cost greatly and improving the yield and quality of the vaccines obviously, along with short production period, no restriction to raw material supply, small occupied area, easy and quick expansion of production scale, light environmental pollution, easy processing, high automaticity, low employment and easy realization of balanced and stable quality.

The invention provides an MDCK-ST3GAL I cell line, concretely an MDCK cell line stably expressing beta-galactoside alpha-2, 3-sialytransferase I(ST3GAL I) with the preservation number of CGMCC No. 2620; the invention further provides a method for establishing the MDCK-ST3GAL I cell line and a method for improving the growth titre of avian influenza virus and the forming capability of plaque. The invention further provides an application of the MDCK-ST3GAL I cell line in researching avian influenza virus 2, 3 linked receptor tendency; and the invention is used for applications in monitoring the avian influenza virus receptor associative property variant strain, screening medicines resisting avian influenza virus, measuring the neutralizing antibody and mass producing cell culture vaccine.

The invention relates to the preparation field of the avian influenza virus vaccine, and especially relates to a method for cultivating recombinant avian influenza subtype virus through full-suspension cell. The method comprises the following steps: inoculating the recombinant avian influenza subtype virus chick embryo virus into MDCK monolayer cell to acclimate and culture, inoculating the harvested culture, repeating the cultivating until the proliferation speed of the recombinant avian influenza subtype virus is stable, wherein the virus content is larger than or equal to 10<7.5>EID[50]; and then inoculating the suspension cell; acquiring virus liquid while cultivating until the cytopathy achieves 75% or above, namely obtaining the recombinant avian influenza subtype virus. The chick embryo virus is firstly inoculated into the MDCK monolayer cell to acclimate and cultivate, and then is inoculated to the suspension MDCK cell, thereby effectively increasing the performance stability of the suspension virus obtained through the production, wherein the obtained suspension virus HA is larger than or equal to 1 to 1024, each 0.1ml virus content is larger than or equal to 10<8.0>EID[50], and each 1ml virus content is larger than or equal to 10<8.0>TCID[50].

The invention discloses a cryopreservation method for protecting cell junction. The method comprises the following steps of: a) culturing Madin Darby canine kidney (MDCK) cells; b) dividing the MDCK cells in the step a) into a normal control group, a cryopreservation group, a trehalose group, an Hsp70 high expression group and an Hsp70+ trehalose group; c) performing filter culture on the normal control group, the cryopreservation group and the trehalose group respectively, performing filter culture and gene transfection on the Hsp70 high expression group, and performing filter culture and gene transfection on the Hsp70+ trehalose group; d) performing cryopreservation on the normal control group, the cryopreservation group, the trehalose group, the Hsp70 high expression group and the Hsp70+ trehalose group; e) growing cells and performing morphologic observation (the cultured cells are observed by a microscope and are subjected to HE staining); f) testing the survival rate of the cells; g) observing and analyzing the cell junction morphology and structure; and h) performing a fluorescein experiment. The method is simple, and convenient to use; and the structure and function of the cell junction after tissues and organs are subjected to cryopreservation can be kept complete, and the damage of the cell junction can be effectively avoided.

The invention discloses a series of urea transporter inhibitors of which the structural formula is disclosed in the specification. An erythrocyte model is used for screening to obtain compounds for inhibiting urea transporters. The experimental result indicates that the compounds (such as Youti) can inhibit the permeation of urea transporter UT-B mediated erythrocyte membranes for urea, and the action forms a dosage dependency relationship; Youti within effective dose range has no cytotoxic action on the MDCK (Madin-Darby Canine Kidney) cells, which indicates that the action of Youti for inhibiting cell permeable urea is irrelevant to cytotoxicity; the inhibiting action of Youti on the urea transporter UT-B gradually increases; the inhibiting action of Youti on the urea transporter UT-B is reversible; and the in-vivo test result proves that Youti can obviously increase the uresis amount of a rat, lower the concentration of urea in the urine of the rat, and lower the osmotic pressure, which indicates that Youti has selective diuresis action on urea in vivo.