The present invention relates to a cell differentiation medium composition, a high secretion insulin-producing cells and a preparation method thereof. The high secretion insulin-producing cells obtained by using the cell differentiation medium composition to induce stem cell differentiated under specific conditions can secrete a large amount of insulin in a short time, and when the high-secreting insulin-producing cells are transplanted into the human body, they are not easy to be swallowed by macrophages, which can improve the survival rate of the insulin-producing cells and prolong the time of insulin secretion thereby.

The present invention relates to cell culture media comprising alpha keto acids. The poor solubility of some amino acids like isoleucine, leucine and valine can be overcome by substituting them with the respective alpha keto acid.

The present invention relates to a method for reducing the oxidation of methionine residues in a recombinant protein by culturing cells expressing the recombinant protein in a cell culture medium and feeding the cells with glutamine.

A method of cell culture includes (i) culturing cells in a cell culture medium, and (ii) maintaining at least one metabolite below an inhibitory concentration in the cell culture medium for the at least one metabolite, wherein the at least one metabolite is aconitic acid (AA), leucinic acid (HICA), cytidine monophosphate (CMP), methylsuccinic acid (MSA), trigonelline (TRI), N-acetylputrescinium (NAP), or a combination thereof, and wherein the enzyme comprises ADH5, BCAT1, CAT, GOT1, HADHB, HOGA1, SLC35A1, or a combination thereof.

Methods for obtaining populations of norepinephrine (NE) neuronal progenitor cells and creating enriched populations of NE neurons are provided herein. Also provided herein are methods for obtaining genetically modified NE neurons expressing a NE sensor or a TH-reporter, and methods for using NE neurons obtained according to the methods of this disclosure.

Cell culture media, concentrated media and feeds, methods of manufacturing cell culture media and feeds, and methods of culturing cells are provided. One or more small peptides, including dipeptides are added to the cell culture media to provide improved stability and improved conditions for culturing cells.

Provided in the present invention is a cell freezing medium for clinical use. In particular, the cell freezing medium of the present invention comprises the following components: (1) human albumin; (2) cryoprotectant: the cryoprotectant comprises a combination of one or more of dimethyl sulfoxide, glycerol, and ethylene glycol; (3) a saline buffer; wherein the salt buffer is a solution containing Na.sup.+, K.sup.+, Mg.sup.+, Cl.sup.−, and CH.sub.3COO.sup.− ions; (4) a vitamin; and (5) an amino acid, wherein the human albumin concentration is 1%-20% (w/v). The cell, after long-term cryopreservation with the freezing medium of the present invention, has a high viability, and the cellular efficiency maintains a high uniformity. The grade of purity of the freezing medium of the present invention is the pharmaceutical grade or USP grade; and the freezing medium is safe and reliable for clinical use, and can be used or conventional adherent and suspension cells.

A new cell line and an antibody for determining the activity of botulinum toxin are disclosed. Also disclosed is a method of determining the activity of botulinum toxin using the cell line and/or the antibody.

A method for producing eyefield progenitor cells, including: (a) obtaining a starting population comprising human pluripotent stem cells (hPSCs) that are dissociated to essentially single cells; (b) culturing said hPSCs to a contact-inhibited monolayer; (c) contacting said hPSC monolayer in a primary differentiation medium to generate a homogeneous, contact-inhibited monolayer of anterior neuroectodermal cells (ANECs); (d) dissociating said homogeneous ANECs from (c) into essentially single cells; (e) forming dissociated ANECs into size-controlled and homogeneous 3D aggregates (ANEBs), wherein the ANEBs are 3D aggregates of anterior neuroectodermal cells that are distinct from embryoid bodies; and (f) culturing said ANEBs in a primary differentiation medium in suspension to further differentiate them to Eyefield Progenitor Cells (EFPCs).

A method for culturing primary cells of gastric cancer and gallbladder cancer and cholangiocarcinoma and auxiliary reagents. A method for culturing primary cells of gastric cancer and gallbladder cancer and cholangiocarcinoma and auxiliary reagents. The core of the technology is that: (1) the solid tumor tissues of gastric cancer and gallbladder cancer and cholangiocarcinoma are treated with a mild cell dissociation reagent, and the primary tumor cells of gallbladder cancer and cholangiocarcinoma in a bile sample are isolated by a mild method to ensure the vitality of cancer cells to the greatest extent; (2) a special serum-free medium is prepared, and tumor cells of gastric cancer and gallbladder cancer and cholangiocarcinoma are cultured in vitro by a suspension culture system to eliminate the interference of normal cells to the greatest extent while ensuring normal amplification of cancer cells.