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Zeria Pharmaceutical Co., Ltd.

W. Alton Jones Cell Science Center Incorporated

Wako Pure Chemical Industries, Inc.

Tetsuji Okamoto

Makoto Asashima

J Denry Sato

Yoshinari Myoken

Miho Furue

The present invention discloses a medium for a serum-free medium capable of culturing ES cells for a long period while maintaining their undifferentiated state without using feeder cells, and a basal medium for producing the medium thus described. The basal medium of the present invention is characterized by that it has composition shown by Table I. Further, the present invention discloses a medium for ES cells produced with the basal medium.

Medium for ES culturing

There is provided a method of testing squamous epithelial cells and a method of screening therapeutic agents for squamous cell carcinoma. That the base guanine at position 2128 (exon 17) of the FGFR3 gene is mutated to thymine in the cells of squamous cell carcinoma, or that the cells of squamous cell carcinoma produce an FGFR3 protein in which the amino acid glycine at position 697 is mutated to cysteine is utilized to facilitate the diagnosis and treatment of squamous cell carcinoma.

Method of screening therapeutic or preventative agents for squamous epithelial cell carcinoma

Cholesterol auxotrophy of myeloma cells is used as the basis for selecting hybridomas. The outgrowth of nascent hybridomas in a cholesterol-free medium was 3- to 9-fold more efficient than that in HAT medium and resulted in 3- to 13-times as many antigen-reactive hybridoma cells. This method of hybridoma selection can be applied with any sterol-dependent parent cell line. The nutrient medium is also preferably free of Ham's F-12 nutrient mixture.

Method for the isolation of hybridomas using cholesterol auxotrophy of

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Hiroshima, Japan

Tetsuji Okamoto