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2015 ; 22
(6
): 692-7
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Induction of primitive streak and mesendoderm formation in monolayer hESC culture
by activation of TGF-? signaling pathway by Activin B
#MMPMID26586995
Mahmood A
; Aldahmash A
Saudi J Biol Sci
2015[Nov]; 22
(6
): 692-7
PMID26586995
show ga
Human embryonic stem cells (hESCs) have the ability to differentiate into all
human cells, however controlling the differentiation has always been a challenge.
In the present study we have investigated the direct differentiation of hESCs on
MEFs by using TGF-? signaling pathway activators Activin A and Activin B.
Activation of the TGF-? pathway with Activin B in low serum highly induced
primitive streak and mesendoderm formation after 24 h, which included
up-regulation of SOX 17 and BRACHYURY protein and gene expression. Continuous
stimulation with Activin B in 2% serum further induced mesendoderm formation by
increased gene expression of Brachyury, SOX17, MEOX and FOX at the same time we
found down-regulation of neuroectodermal marker genes. Further, by stimulating
the mesodermal cells by BMP-2 we succeeded to induce mesenchymal like cells with
high expression of mesenchymal markers including; MEOX, FOX, RUNX2, COL1 and
OSTEOPONTIN. In conclusion we have directed the differentiation of hESCs as
monolayer to primitive streak like cells with Activin B and further into pure
mesoderm and mesenchymal like cells by BMP-2.