Differentiation of human pluripotent stem cells into Medial Ganglionic Eminence vs. Caudal Ganglionic Eminence cells.
- Authors
- Ahn, Sandra; Kim, Tae-Gon; Kim, Kwang-Soo; Chung, Sangmi
- Year
- 2016
- Journal
- Methods (San Diego, Calif.)
- PMID
- 26364591
- DOI
- 10.1016/j.ymeth.2015.09.009
- PMCID
- PMC4786472
Human pluripotent stem cells (PSCs) represent an opportunity to study human development in vitro, to model diseases in a dish, to screen drugs as well as to provide an unlimited and ethically unimpeded source of therapeutic cells. Cortical GABAergic interneurons, which are generated from Medial Ganglionic Eminence (MGE) cells and Caudal Ganglionic Eminence (CGE) cells during embryonic development, regulate cortical neural networks by providing inhibitory inputs. Their malfunction, resulting in failure to intricately regulate neural circuit balance, has been implicated in brain diseases, such as schizophrenia, autism and epilepsy. In this study, using combinatorial and temporal modulation of developmentally relevant dorsoventral and rostrocaudal signaling pathways, we efficiently generated MGE cells vs. CGE cells from human PSCs, which predominantly generate Parvalbumin-expressing or Somatostatin-expressing interneurons vs. Calretinin-expressing interneurons, respectively. Efficient generation of specific differentiated progenies of hPSCs as shown in this study will be a pivotal step to realize the full potential of hPSCs for regenerative medicine, developmental studies, disease modeling, bioassay, and drug screening.
(a–d) Bright-field images taken during in vitro differentiation of H9 cells. (e and f) H9-derived MGE cells, assayed after 25 days of differentiation, highly expressed independent ventral telencephalic marker Olig2 and telencephalic marker FoxG1 (adapted from [46]). Scale bar: 100 µm.
FGF8 and FGF19 regulate rostral/caudal identity of ventral telencephalic cells (adapted from [46]). FGF8 treatment induced MGE phenotype while FGF19 induced CGE phenotype, as shown by immunocytochemistry and cell counting analysis after 3 weeks of differentiation of H9 cells (Mean ± SEM; n = 3, P < 0.05, two tailed t-test). The image in the insets is Hoechst-labeled nuclei of the same microscope field. Scale bar: 100 µm.
(a) Overview of the optimized MGE derivation protocol. (b) Overview of the optimized CGE derivation protocol.
FACS analysis of fixed cells (adapted from [46]). (a) FACS analysis of MGE cells generated from H9 cells after Nkx2.1 staining at day 21 of differentiation. (b–d) Combined and temporal treatment with IWP-2, SAG and FGF8 resulted in robust induction of MGE cells from H9 and H7 hESCs as well as iPSCs, assayed after 25 days of differentiation. The image in the insets is Hoechst-labeled nuclei of the same microscope field. Scale bar: 100 µm.
Gene expression analysis during MGE derivation of H9 cells (adapted from [46]), assayed by real-time PCR (Mean ± SEM; n = 3) on days 0, 3, 7, 14 and 21 of differentiation. The expression level of Nanog, Oct4, Nkx2.1, Gsx2, Dlx2 and Lhx6 was analyzed at each time point after differentiation. The expression level of each gene was normalized to that of GAPDH.
Human MGE cells generated GABAergic interneurons (adapted from [46] and [29]). (a–l) Immunocytochemistry and cell counting analysis after 6 weeks of differentiation (Mean ± SEM; n = 4, P < 0.05, two tailed t-test), showing the expression of β-tubulin, GABA, Lhx6, GAD, Sox6, Calbindin (Calb), Parvalbumin (PV) and Somatostatin (SST). Immunostaining was performed on H9-derived cells except a and c, in which H7-derived cells were analyzed. The image in the insets is Hoechst-labeled nuclei of the same microscope field. (m–s) Immunohistochemical analysis of transplanted H7-derived MGE cells 4 months after transplantation, showing the expression of SST, PV, Calretinin (Calr), Neuropeptide Y (NPY), Calb among transplanted human nuclei (hNuc)+ cells. Scale bar: 100 µm.
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