Embryonic stem cells (ESCs), which have characteristics such as self-renewal, indefinite proliferation, and pluripotency, are thought to hold great promise for regenerative medicine. ESCs are generally cultured on mouse embryonic fibroblast (MEF) or MEF conditioned medium (MEF-CM). However, for therapeutic applications, it is preferable for ESCs to be cultured under chemically defined conditions.
Here, we report synthetic compounds that allow expansion of undifferentiated mouse ESCs in the absence of MEF, Leukemia Inhibitory Factor (LIF), and Fetal Bovine Serum (FBS). ESCs cultured for more than 30 d in a serum-free medium supplemented with indole derivertives retained their characteristic morphology and expressed markers such as SSEA-1, OCT3/4, Rex-1, Sox2, and Nanog. They consistently differentiated into many types of cells, including neurons, muscle cells, and hepatocytes.
These results indicate that our compounds provide a more efficient and safer large-scale culture system for pluripotent ESCs, and hence might contribute to the use of ESCs in therapeutic applications.

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