Inhibition of Rho kinase regulates specification of early differentiation events in P19 embryonal carcinoma stem cells

The Rho kinase pathway plays a key role in many early cell/tissue determination events that take place in embryogenesis. Rho and its downstream effector Rho kinase (ROCK) play pivotal roles in cell migration, apoptosis (membrane blebbing), cell proliferation/cell cycle, cell-cell adhesion and gene r...

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Veröffentlicht in:PloS one 2011-11, Vol.6 (11), p.e26484-e26484
Hauptverfasser: Krawetz, Roman J, Taiani, Jaymi, Greene, Alexis, Kelly, Gregory M, Rancourt, Derrick E
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Taiani, Jaymi
Greene, Alexis
Kelly, Gregory M
Rancourt, Derrick E
description The Rho kinase pathway plays a key role in many early cell/tissue determination events that take place in embryogenesis. Rho and its downstream effector Rho kinase (ROCK) play pivotal roles in cell migration, apoptosis (membrane blebbing), cell proliferation/cell cycle, cell-cell adhesion and gene regulation. We and others have previously demonstrated that inhibition of ROCK blocks endoderm differentiation in embryonal carcinoma stem cells, however, the effect of ROCK inhibition on mesoderm and ectoderm specification has not been fully examined. In this study, the role of ROCK within the specification and differentiation of all three germ layers was examined. P19 cells were treated with the specific ROCK inhibitor Y-27623, and increase in differentiation efficiency into neuro-ectodermal and mesodermal lineages was observed. However, as expected a dramatic decrease in early endodermal markers was observed when ROCK was inhibited. Interestingly, within these ROCK-inhibited RA treated cultures, increased levels of mesodermal or ectodermal markers were not observed, instead it was found that the pluripotent markers SSEA-1 and Oct-4 remained up-regulated similar to that seen in undifferentiated cultures. Using standard and widely accepted methods for reproducible P19 differentiation into all three germ layers, an enhancement of mesoderm and ectoderm differentiation with a concurrent loss of endoderm lineage specification was observed with Y-27632 treatment. Evidence would suggest that this effect is in part mediated through TGF-β and SMAD signaling as ROCK-inhibited cells displayed aberrant SMAD activation and did not return to a 'ground' state after the inhibition had been removed. Given this data and the fact that only a partial rescue of normal differentiation capacity occurred when ROCK inhibition was alleviated, the effect of ROCK inhibition on the differentiation capacity of pluripotent cell populations should be further examined to elucidate the role of the Rho-ROCK pathway in early cellular 'fate' decision making processes.
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Rho and its downstream effector Rho kinase (ROCK) play pivotal roles in cell migration, apoptosis (membrane blebbing), cell proliferation/cell cycle, cell-cell adhesion and gene regulation. We and others have previously demonstrated that inhibition of ROCK blocks endoderm differentiation in embryonal carcinoma stem cells, however, the effect of ROCK inhibition on mesoderm and ectoderm specification has not been fully examined. In this study, the role of ROCK within the specification and differentiation of all three germ layers was examined. P19 cells were treated with the specific ROCK inhibitor Y-27623, and increase in differentiation efficiency into neuro-ectodermal and mesodermal lineages was observed. However, as expected a dramatic decrease in early endodermal markers was observed when ROCK was inhibited. 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Given this data and the fact that only a partial rescue of normal differentiation capacity occurred when ROCK inhibition was alleviated, the effect of ROCK inhibition on the differentiation capacity of pluripotent cell populations should be further examined to elucidate the role of the Rho-ROCK pathway in early cellular 'fate' decision making processes.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0026484</identifier><identifier>PMID: 22140430</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Aberration ; Amides - pharmacology ; Animals ; Apoptosis ; Binding sites ; Biochemistry ; Biology ; Biomarkers ; Bone morphogenetic proteins ; Breast cancer ; Carcinoma ; Cell adhesion ; Cell adhesion &amp; migration ; Cell cycle ; Cell differentiation ; Cell Differentiation - drug effects ; Cell migration ; Cell proliferation ; Decision making ; Differentiation ; Ectoderm ; Embryogenesis ; Embryonal Carcinoma Stem Cells - enzymology ; Embryonal Carcinoma Stem Cells - pathology ; Embryonic growth stage ; Embryos ; Endoderm ; Endoderm - drug effects ; Endoderm - pathology ; Gene expression ; Gene regulation ; Genes ; Growth factors ; Humans ; Inhibition ; Kinases ; Mesoderm ; Mice ; Molecular biology ; Oct-4 protein ; Pluripotency ; Pluripotent Stem Cells - drug effects ; Pluripotent Stem Cells - pathology ; Protein Kinase Inhibitors - pharmacology ; Proteins ; Pyridines - pharmacology ; Rho-associated kinase ; rho-Associated Kinases - antagonists &amp; inhibitors ; rho-Associated Kinases - metabolism ; Signal transduction ; Signal Transduction - drug effects ; Signaling ; Smad protein ; Specifications ; Stem cell research ; Stem cells ; Transforming growth factors ; Tretinoin - pharmacology</subject><ispartof>PloS one, 2011-11, Vol.6 (11), p.e26484-e26484</ispartof><rights>COPYRIGHT 2011 Public Library of Science</rights><rights>2011 Krawetz et al. 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Rho and its downstream effector Rho kinase (ROCK) play pivotal roles in cell migration, apoptosis (membrane blebbing), cell proliferation/cell cycle, cell-cell adhesion and gene regulation. We and others have previously demonstrated that inhibition of ROCK blocks endoderm differentiation in embryonal carcinoma stem cells, however, the effect of ROCK inhibition on mesoderm and ectoderm specification has not been fully examined. In this study, the role of ROCK within the specification and differentiation of all three germ layers was examined. P19 cells were treated with the specific ROCK inhibitor Y-27623, and increase in differentiation efficiency into neuro-ectodermal and mesodermal lineages was observed. However, as expected a dramatic decrease in early endodermal markers was observed when ROCK was inhibited. Interestingly, within these ROCK-inhibited RA treated cultures, increased levels of mesodermal or ectodermal markers were not observed, instead it was found that the pluripotent markers SSEA-1 and Oct-4 remained up-regulated similar to that seen in undifferentiated cultures. Using standard and widely accepted methods for reproducible P19 differentiation into all three germ layers, an enhancement of mesoderm and ectoderm differentiation with a concurrent loss of endoderm lineage specification was observed with Y-27632 treatment. Evidence would suggest that this effect is in part mediated through TGF-β and SMAD signaling as ROCK-inhibited cells displayed aberrant SMAD activation and did not return to a 'ground' state after the inhibition had been removed. Given this data and the fact that only a partial rescue of normal differentiation capacity occurred when ROCK inhibition was alleviated, the effect of ROCK inhibition on the differentiation capacity of pluripotent cell populations should be further examined to elucidate the role of the Rho-ROCK pathway in early cellular 'fate' decision making processes.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>22140430</pmid><doi>10.1371/journal.pone.0026484</doi><tpages>e26484</tpages><oa>free_for_read</oa></addata></record>
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subjects Aberration
Amides - pharmacology
Animals
Apoptosis
Binding sites
Biochemistry
Biology
Biomarkers
Bone morphogenetic proteins
Breast cancer
Carcinoma
Cell adhesion
Cell adhesion & migration
Cell cycle
Cell differentiation
Cell Differentiation - drug effects
Cell migration
Cell proliferation
Decision making
Differentiation
Ectoderm
Embryogenesis
Embryonal Carcinoma Stem Cells - enzymology
Embryonal Carcinoma Stem Cells - pathology
Embryonic growth stage
Embryos
Endoderm
Endoderm - drug effects
Endoderm - pathology
Gene expression
Gene regulation
Genes
Growth factors
Humans
Inhibition
Kinases
Mesoderm
Mice
Molecular biology
Oct-4 protein
Pluripotency
Pluripotent Stem Cells - drug effects
Pluripotent Stem Cells - pathology
Protein Kinase Inhibitors - pharmacology
Proteins
Pyridines - pharmacology
Rho-associated kinase
rho-Associated Kinases - antagonists & inhibitors
rho-Associated Kinases - metabolism
Signal transduction
Signal Transduction - drug effects
Signaling
Smad protein
Specifications
Stem cell research
Stem cells
Transforming growth factors
Tretinoin - pharmacology
title Inhibition of Rho kinase regulates specification of early differentiation events in P19 embryonal carcinoma stem cells
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