Osaka University

Stemrim Inc.

Takashi Shimbo

Katsuto Tamai

Takehiko Yamazaki

Eiji Sasaki

Takahiro Tsushima

The present inventors discovered that an HMGB1 fragment peptide having a specific amino acid sequence exhibits an effect of suppressing erythema, scaling (desquamation), and thickening (infiltration) of the skin in an animal model of psoriasis. Based on these findings, pharmaceutical compositions for the prevention and/or treatment of psoriasis, which comprise the HMGB1 fragment peptide having the specific amino acid sequence are provided.

Therapeutic agent for psoriasis

The inventors discovered that ectodermal mesenchymal stem cells circulating in peripheral blood that are induced by necrotic tissue damage contribute to the regeneration of damaged tissue. On the basis of this discovery, provided are ectodermal mesenchymal stem cells, a method for producing the same, and a screening method for a substance having pluripotent stem cell inductive activity, the screening method using cells induced by necrotic tissue damage in peripheral blood as an index.

Ectodermal mesenchymal stem cells and method for producing same

The present inventors identified many nuclear proteins contained in the extract of skin tissue by mass spectrometry, randomly selected multiple partial amino acid sequences of the nuclear proteins, chemically synthesized peptides consisting of the partial amino acid sequences, and examined their activity of mobilizing mesenchymal stem cells. As a result, it was found that these multiple peptides show the activity of mobilizing mesenchymal stem cells into peripheral blood, even though their amino acid sequences are completely different from each other. The inventors also found that fragment peptides of the nuclear proteins have therapeutic effects on diseases characterized by inflammation and abnormalities of the immune system (e.g., inflammatory bowel disease and psoriasis). Based on these findings, a new regenerative medicine technology that can overcome the problems of cell transplantation therapy is provided.

Disease treatment drug based on mesenchymal-stem-cell mobilization

The present inventors discovered that an HMGB1 fragment peptide having a specific amino acid sequence exhibits an effect of suppressing weight loss and an effect of suppressing shortening of the large intestine and mucosal damage in an animal model of inflammatory bowel diseases. Based on these findings, pharmaceutical compositions for the prevention and/or treatment of inflammatory bowel diseases, which comprise the HMGB1 fragment peptide having the specific amino acid sequence are provided.

Growing community of inventors

Osaka, Japan

Takashi Shimbo