Lectin Binding Profiles among Human Embryonic Stem Cells

I have featured  numerous posting of innovations by Dr. Steve Stice and our friends at Aruna Biomedical. Here I would like to share a publication by Steve and his team featuring a new slant on isolating eSC Derived hNP Neural Progenitors. This study also includes methods for sorting hESCs, hNP cells and hMP cells.

Mahesh C. Dodla, Amber Young, Alison Venable, Kowser Hasneen1, Raj R. Rao, David W. Machacek, Steven L. Stice. Differing Lectin Binding Profiles among Human Embryonic Stem Cells and Derivatives Aid in the Isolation of Neural Progenitor Cells. PLoS ONE 6(8): e23266. doi:10.1371/journal.pone.0023266.

Abstract: Identification of cell lineage specific glycans can help in understanding their role in maintenance, proliferation and differentiation. Furthermore, these glycans can serve as markers for isolation of homogenous populations of cells. Using a panel of eight biotinylated lectins, the glycan expression of hESCs, hESCs-derived human neural progenitors (hNP) cells, and hESCs-derived mesenchymal progenitor (hMP) cells was investigated. Our goal was to identify glycans that are unique for hNP cells and use the corresponding lectins for cell isolation. Flow cytometry and immunocytochemistry were used to determine expression and localization of glycans, respectively, in each cell type. These results show that the glycan expression changes upon differentiation of hESCs and is different for neural and mesenchymal lineage. For example, binding of PHA-L lectin is low in hESCs (14±4.4%) but significantly higher in differentiated hNP cells (99±0.4%) and hMP cells (90±3%). Three lectins: VVA, DBA and LTL have low binding in hESCs and hMP cells, but significantly higher binding in hNP cells. Finally, VVA lectin binding was used to isolate hNP cells from a mixed population of hESCs, hNP cells and hMP cells. This is the first report that compares glycan expression across these human stem cell lineages and identifies significant differences. Also, this is the first study that uses VVA lectin for isolation for human neural progenitor cells.


Figure 1. Defining the stem cell phenotype using immunocytochemistry and flow cytometry.Phase contrast image of hESCs (A), hNPs (B), and hMPs (C). hESCs express pluripotency markers: Oct 4 (D,GG, JJ), SSEA-4 (G), and Sox 2 (J,GG); lack expression of Nestin (M, JJ), CD 166 (P,DD), CD73 (DD), and CD105 (AA). hNPs have low expression of pluripotency markers: Oct 4 (E,KK), SSEA-4 (H); and mesenchymal markers CD 166 (Q,EE), CD73 (EE), and CD105 (BB). hNPs express neural markers: Sox 2 (J,HH) and Nestin (N,HH,KK). hMPs lack expression of pluripotency markers: Oct 4 (F,LL), SSEA-4 (I), and Sox 2 (L,II); however, hMPs express Nestin (O,II,LL), CD 166 (R,FF), CD73 (FF), CD90 (CC) and CD105 (CC). All the cells have been stained with the nuclear marker DAPI (blue) in panels D- P. Scale bar: 10 µm. In the dot plots, red dots indicate isotype control or secondary antibody only; black dots indicate the antigen staining. doi:10.1371/journal.pone.0023266.g001

 By comparing hESCs, hNP cells and hMP cells, we have identified glycan structures that are unique to hNP cells: GalNac end groups (VVA), α-linked N-acetylgalactosamine (DBA), and fucose moieties α-linked to GlcNAc (LTL). Future studies help in identifying the roles of these glycans in cell maintenance, proliferation and differentiation fate.

I will keep you posted on these future Studies.