261 results about "Hamster" patented technology

Methods and compositions for the production of recombinant proteins in a human cell line. The methods and positions are particularly useful for generating stable expression of human recombinant proteins of interest that are modified post-translationally, for example, by glycosylation. Such proteins may have advantageous properties in comparison with their counterparts produced in non-human systems such as Chinese Hamster Ovary cells.

An expression vector for eukaryotic cells comprising a gene which codes for a protein of interest, functionally linked to a hamster-ubiquitin / S27a-promoter and a gene which codes for a fluorescent protein. Preferably the expression vector also contains an amplifiable selectable marker gene. The invention also describes host cells, preferably mammalian cells, which have been transfected with the expression vector, processes for producing heterologous gene products and a method of selecting high-producing cells.

Prion protein binding materials and methods for using the binding materials to detect or remove a prion protein from a sample, such as a biological fluid or an environmental sample. The binding materials are capable of binding to one or more forms of prion protein including cellular prion protein (PrPc), infectious prion protein (PrPsc), recombinant prion protein (PrPr), and proteinase resistant prion protein (PrPres). Prions from various species, including humans and hamsters, are bound by the binding materials.

Ligands that bind to prion proteins and methods for using the ligands for detecting or removing a prion protein from a sample, such as a biological fluid or an environmental sample. The ligands are capable of binding to one or more forms of prion protein including cellular prion protein (PrPc), infectious prion protein (PrPsc), and recombinant prion protein (PrPr). Prions from various species, including humans and hamsters, are bound by the ligands. Also provided is a method of treating or retarding the development of a prion-associated pathology in a subject.

The uses of mono acetyl diacyl glycerol derivatives extracted from deer antler for immunomodulating agent disclosed. Medical supplies and health foods containing the same as an effective ingredient also disclosed. Mono acetyl diacyl glycerol derivatives shows significantly effect for immuno modulation including immune enhancing. In the case of inducing cancer in a hamster by injecting cancer cell line, cancer development was delayed by activating lymphocytes, monocytes, and dendritic cells that are important factors to promote immunity and apoptosis of cancer cell was induced by promoting cytotoxicity of immune cell against cancer cell. Also in the case of mouse induced septic shock, it shows 100% survival rate even after lapse of 120 hours by control of immune function and suppression effect apoptosis. Therefore, mono acetyl diacyl glycerol derivatives according to the present invention can be effectively used for an immunomodulating agent, a sepsis treatment, a cancer treatment, and a health food for an immune modulation or the prevention of cancer.

The uses of mono acetyl diacyl glycerol derivatives extracted from deer antler for immunomodulating agent disclosed. Medical supplies and health foods containing the same as an effective ingredient also disclosed. Mono acetyl diacyl glycerol derivatives shows significantly effect for immuno modulation including immune enhancing. In the case of inducing cancer in a hamster by injecting cancer cell line, cancer development was delayed by activating lymphocytes, monocytes, and dendritic cells that are important factors to promote immunity and apoptosis of cancer cell was induced by promoting cytotoxicity of immune cell against cancer cell. Also in the case of mouse induced septic shock, it shows 100% survival rate even after lapse of 120 hours by control of immune function and suppression effect apoptosis. Therefore, mono acetyl diacyl glycerol derivatives according to the present invention can be effectively used for an immunomodulating agent, a sepsis treatment, a cancer treatment, and a health food for an immune modulation or the prevention of cancer.

The invention discloses a Chinese hamster ovary (CHO) genetic engineering cell line for performing high-level secretory expression on AcAPc2 and relates to a CHO cell line for performing high-level secretory expression on the AcAPc2. The invention aims to solve the problems that the expression level of an exogenous gene product expressed by using CHO is low at present and the industrialized production cannot be realized. The CHO genetic engineering cell line for performing high-level secretory expression on the AcAPc2 is obtained by the following step of: screening dihydrofolate reductase-deficient CHO cells which are taken as host cells, and amplifying to obtain the cell line for performing stable and high-level expression on the AcAPc2. The CHO cell line can perform high-level expression on the AcAPc2; the expression level can be up to 10mg / L.72h; and the CHO cell line can be industrially produced. The cell line is used for resisting blood coagulation and treating tumor, septicaemiaand the like.

With the goal of creating a combination vaccine against Shigella and other diarrheal pathogens we have constructed a prototype vaccine strain of Shigella flexneri 2a (SC608) that can serve as a vector for the expression and delivery of heterologous antigens to the mucosal immune system. SC608 is an asd derivative of SC602, a well-characterized vaccine strain, which has recently undergone several phase 1 and 2 trials for safety and immunogenicity. Using non-antibiotic asd-based plasmids, we have created novel constructs for the expression of antigens from enterotoxigenic E. coli (ETEC), including CFA / I (CfaB and CfaE) and the B-subunit from heat-labile enterotoxin (LTB) in Shigella vaccine strain SC608. Heterologous protein expression levels and cellular localization are critical to immune recognition and have been verified by immunoblot analysis. Following intranasal immunization (SC608(CFAI) and SC608(CFAI / LTB) of guinea pigs, serum IgG and IgA immune responses to both the Shigella LPS and ETEC antigens can be detected by ELISA. In addition, ELISPOT analysis for ASCs from cervical lymph nodes and spleen showed similar responses. All vaccine strains conferred high levels of protection against challenge with wild-type S. flexneri 2a using the Sereny test. Furthermore, serum from guinea pigs immunized with SC608 expressing CfaB and LTB contained antibodies capable of neutralizing the cytological affects of heat-labile toxin (HLT) on Chinese Hamster Ovary (CHO) cells. These initial experiments demonstrate the validity of a multivalent invasive Shigella strain that can serve as a vector for the delivery of pathogen-derived antigens.

The invention relates to a culture medium and the usage thereof, in particular to the Chinese hamster ovary cell enlarging culture medium and the usage thereof. The invention belongs to the biological product field. The Chinese hamster ovary cell enlarging non-protein culture medium of the invention, wherein comprises minimal medium, and also comprises microelement, Transferrin and Insulin subsistent. A serum-containing routine culture medium can be directly replaced with the serum free culture medium of the Chinese hamster ovary cells, and the Chinese hamster ovary cells are not required to adapt process.

Methods and compositions for the production of recombinant proteins in a human cell line. The methods and compositions are particularly useful for generating stable expression of human recombinant proteins of interest that are modified post-translationally, for example, by glycosylation. Such proteins may have advantageous properties in comparison with their counterparts produced in non-human systems such as Chinese hamster ovary cells.

The invention provides a primer pair used for detecting the CHO cell genome DNA, a kit containing the primer pair and a method for detecting the CHO cell genome DNA by using the primer pair, and the primer pair specifically combines to the sections shown in a SEQ ID NO: 1 and a SEQ ID NO: 2 on the CHO cell genome DNA. The PCR detection method which uses the primer pair has the advantages of simple and fast operation, and high sensitivity; can distinguish the interference DNA of escherichia coli or human, even mice or large mice which have homologous cell height with hamster.

A method is provided for screening anti-adenovirus agents. The method includes reducing the activation of the immune system of a small mammal, administering a human adenovirus vector to the small mammal, monitoring the tumor cells in the mammal, and analyzing infectious virus units within the tumor cells and the organs of the small mammal. Specifically, the immune system of the small mammal is suppressed using cyclophosphamide. The small mammal may be, but is not limited to, one of the following: mice, rabbits, cotton rats, hamsters, rats, and other small rodents.

A Chinese hamster ovary genetic engineering cell line capable of efficiently expressing Ancylostoma caninumanticoagulant peptide 5 (AcAP5) in secretion mode relates to a Chinese hamster ovary (CHO) cell line capable of efficiently expressing the AcAP5 in secretion mode. The cell line resolves the problem that at present, expression amount is low by using CHO to express exogenous gene products, and requirements of industrial production cannot be met. The Chinese hamster ovary genetic engineering cell line for the efficient secretion expression AcAP5 utilizes dihydrofolic acid reductase defect type Chinese hamster ovary cells as host cells, and the cell line capable of stably and efficiently expressing AcAP5 is obtained after the host cells are screened and amplified. The CHO cell line can efficiently express the AcAP5, can be produced in industrialization mode and is used for resisting blood coagulation and thrombus. Furthermore, expression amount can reach to 12 mg / L / 72h.