Advanced Life Science Institute, Inc.

Japan As Represented by President of National Cancer Center

Japan Science and Technology Agency

Riken Corporation

Kazuki Sasaki

Ken Yamaguchi

Kae Sato

Atsushi Miyawaki

The present invention relates to fluorescent or luminescent probe reagents for measuring oxidative stress in a cell or an organism. Examples of the probe reagents include: a fluorescent or luminescent protein and a marker protein; a fluorescent or luminescent protein, a marker protein, and a regulatory factor; or a fluorescent or luminescent protein, a marker protein, a cleavage sequence, and a regulatory factor. In the probe reagents, the marker protein makes it possible to detect the oxidative stress caused by reactive oxygen species and comprises a regulatory factor-binding site and a ubiquitin-binding site; and the regulatory factor is a protein making it possible to regulate degradation of the marker protein in response to the reactive oxygen species. The present invention also relates to a method of measuring oxidative stress in a cell or an organism, or a method of screening a substance which suppresses or promotes the oxidative stress in a cell or an organism by using the probe reagent.

Probe reagent for measuring oxidative stress

The present invention relates to a method of concentrating low molecular weight peptides in the supernatant of serum-free cultured cells, said method comprising allowing the peptides to bind to a strong cation exchanger under an acid condition, and eluting them under an alkali condition to concentrate the peptide. Furthermore, peptides having the amino acid sequence as set forth in SEQ ID NO: 1 or 2, and a method of screening cancer markers using antibody to these peptides, are disclosed.

Search for cancer markers by a novel screening method

Search for cancer markers by a screening method

Growing community of inventors

Tokyo, Japan

Kazuki Sasaki