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Neoplasma. 2014;61(4):401-10. doi: 10.4149/neo_2014_049.

The PGI-KLF4 pathway regulates self-renewal of glioma stem cells residing in the mesenchymal niches in human gliomas.


Gliomas display cellular hierarchies with self-renewing tumorigenic glioma stem cells (GSCs) at the apex. The GSC niches function as a regulator of GSC maintenance, however, the exact components of GSC niches that mediate this process are still far from fully defined. Here, we showed that glioma cells with aberrant mesenchymal phenotypes constitute a mesenchymal niche for GSCs. Using patient-derived specimens, we demonstrated that the paracrine PGI signaling, initiated by mesenchymal glioma cells, induces the self-renewal and tumorigenic potentials of GSCs through induction of KLF4. Treatment of intracranial orthotopic xenografts with shPGI or shKLF4 leads to less lethal potency. Our data therefore suggest that blockade of the PGI-KLF4 pathway may provide a therapeutic strategy against GSC niches.

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