Albumin-associated lipids regulate human embryonic stem cell self-renewal

Francesc R. Garcia-Gonzalo, Juan Carlos Izpisúa Belmonte*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

136 Scopus citations


Background. Although human embryonic stem cells (hESCs) hold great promise as a source of differentiated cells to treat several human diseases, many obstacles still need to be surmounted before this can become a reality. First among these, a robust chemically-defined system to expand hESCs in culture is still unavailable despite recent advances in the understanding of factors controlling hESC self-renewal. Methodology/Principal Findings. In this study, we attempted to find new molecules that stimulate long term hESC self-renewal. In order to do this, we started from the observation that a commercially available serum replacement product has a strong positive effect on the expansion of undifferentiated hESCs when added to a previously reported chemically-defined medium. Subsequent experiments demonstrated that the active ingredient within the serum replacement is lipid-rich albumin. Furthermore, we show that this activity is trypsin-resistant, strongly suggesting that lipids and not albumin are responsible for the effect. Consistent with this, lipid-poor albumin shows no detectable activity. Finally, we identified the major lipids bound to the lipid-rich albumin and tested several lipid candidates for the effect. Conclusions/Significance. Our discovery of the role played by albumin-associated lipids in stimulating hESC self-renewal constitutes a significant advance in the knowledge of how hESC pluripotency is maintained by extracelldlar factors and has important applications in the development of increasingly chemically defined hESC culture systems.

Original languageEnglish (US)
Article numbere1384
JournalPloS one
Issue number1
StatePublished - Jan 2 2008
Externally publishedYes

ASJC Scopus subject areas

  • General


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