Proteomic analysis of human blastocoel fluid and blastocyst cells.

Abstract:

:Human embryonic stem cells (hESCs) are derived from the inner cell mass (ICM) of the blastocyst and can differentiate into any cell type in the human body. These cells hold a great potential for regenerative medicine, but to obtain enough cells needed for medical treatment, culture is required on a large scale. In the undifferentiated state, hESCs appear to possess an unlimited potential for proliferation, but optimal, defined, and safe culture conditions remain a challenge. The aim of the present study was to identify proteins in the natural environment of undifferentiated hESCs, namely, the blastocoel fluid, which is in contact with all the cells in the blastocyst, including hESCs. Fifty-three surplus human blastocysts were donated after informed consent, and blastocoel fluid was isolated by micromanipulation. Using highly sensitive nano-high-pressure liquid chromatography-tandem mass spectrometry, 286 proteins were identified in the blastocoel fluid and 1,307 proteins in the corresponding cells of the blastocyst. Forty-two were previously uncharacterized proteins-8 of these originated from the blastocoel fluid. Furthermore, several heat shock proteins (Hsp27, Hsp60, Hsc70, and Hsp90) were identified in blastocoel fluid together with zona pellucida proteins (ZP2-4), Vitamin D-binding protein, and Retinol-binding protein 4. Proteins that regulate ciliary assembly and function were also identified, including Bardet-Biedl syndrome protein 7. This study has identified numerous proteins that cells from the ICM of the human blastocyst are exposed to via the blastocoel fluid. These results can be an inspiration for the development of improved culture conditions for hESCs.

journal_name

Stem Cells Dev

authors

Jensen PL,Beck HC,Petersen J,Hreinsson J,Wånggren K,Laursen SB,Sørensen PD,Christensen ST,Andersen CY

doi

10.1089/scd.2012.0239

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

1126-35

issue

7

eissn

1547-3287

issn

1557-8534

journal_volume

22

pub_type

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