The University of Tokyo

Leland Stanford Junior University

Kyoto University

Hideki Masaki

Hiromitsu Nakauchi

Motoo Watanabe

Irving L Weissman

Tetsuya Ishikawa

Kazuhiro Sakurada

Shunichi Takahashi

Tomoyuki Yamaguchi

Hideyuki Sato

Hideyuki Murayama

Sanae Hamanaka

Naoaki Mizuno

The present invention has found that chimeric animals suffer from noticeable inflammation after birth, though neither immune response nor inflammation in the fetal period of these animals has been reported hitherto. This is an unexpected finding since chimeric animals in the fetal period were exclusively analyzed in prior studies and thus it is deemed that immunotolerance has been theoretically established therein. The present invention provides a composition for suppressing immune response or inflammation in the fetal period of a born chimeric animal.

Finding and treatment of inflammation after birth in chimeric animal

The present invention provides a method for producing a chimeric animal using a primed pluripotent stem cell, a tissue stem cell, a progenitor cell, a somatic cell, or a germ cell. The method for producing a chimeric animal according to the present invention comprises introducing a mammal-derived cell into the embryo of a mammal, the cell being primed pluripotent stem cell, tissue stem cell, progenitor cell, somatic cell, or germ cell.

Method for producing chimeric animal

[Problem to be Solved] The present invention provides a method for producing a chimeric animal using a primed pluripotent stem cell, a tissue stem cell, a progenitor cell, a somatic cell, or a germ cell. [Solution] The method for producing a chimeric animal according to the present invention comprises introducing a mammal-derived cell into the embryo of a mammal, the cell being primed pluripotent stem cell, tissue stem cell, progenitor cell, somatic cell, or germ cell.

The present invention provides a method for putting a primed pluripotent stem cell in a less differentiated state, a method for producing a pluripotent stem cell having an improved chimera forming ability from a primed pluripotent stem cell, and a method for producing a chimeric animal by using the pluripotent stem cell obtained by any of these methods. The present invention also provides a composition containing a Wnt/&#x3b2; catenin signal inhibitor.

Method for producing pluripotent stem cell having improved chimera forming ability from primed pluripotent stem cell, and composition and combination therefor

Establishment of human pluripotent stem cells having properties close to human ES cells with the genome of the patient per se that can circumvent immunological rejection of transplanted cells from cells derived from a postnatal human tissue are described. Human pluripotent stem cells can be induced by introducing three genes of Oct3/4, Sox2 and Klf 4, or three genes of Oct3/4, Sox2 and Klf 4 plus the c-Myc gene or a histone deacetylase (HDAC) inhibitor of undifferentiated stem cells present in various human postnatal tissues in which each gene of Tert, Nanog, Oct3/4 and Sox2 has not undergone epigenetic inactivation.

Human pluripotent stem cells induced from undifferentiated stem cells derived from a human postnatal tissue

Described herein are multipotent stem cells, e.g., human and other mammalian pluripotent stem cells, and related methods.

Growing community of inventors

Tokyo, Japan

Hideki Masaki