Autophagy impairment inhibits differentiation of glioma stem/progenitor cells
Yaodong Zhao1, Qiang Huang, Jicheng Yang
1Department of Neurosurgery, 2nd Affiliated Hospital of Soochow University, Jiangsu, PR China.
Abstract:
Despite of similarities between glioma stem/progenitor cells (GSPCs) and neural stem/progenitor cells (NSPCs), inhibition of differentiation is a distinct characteristic of GSPCs. In this study, we investigated the effects of autophagy impairment on inhibition of differentiation of GSPC, and its molecular mechanism. GSPCs were kept by our laboratory; NSPCs were isolated from human fetal brain tissue. We found that the autophagic activity in GSPCs was significantly lower than that in NSPCs. However, the autophagic activity markedly increased after GSPCs were induced to differentiate by fetal calf serum (FCS). The autophagy inhibitors 3-methyladenine and Bafilomycin A1 (BFA) inhibited the FSC-induced differentiation of GSPCs. And autophagy activator Rapamycin could promote differentiation of GSPCs. In order to disclose whether the loss of PTEN in GSPC is related to the deficiency of autophagic activity in GSPCs (for PTEN being lost in the GSPCs studied by us), we introduced the wild type gene of PTEN into GSPCs, and found that the autophagic activity was restored significantly after the gene transduction. The low autophagic activity in GSPCs leads to the inhibition of differentiation of GSPCs, and the loss of PTEN in GSPCs probably is an underlying mechanism for the low autophagic activity in GSPCs. These results suggest that bust autophagic activity target at PTEN might be a potential therapy target for glioma therapy.
Insights
Low autophagy in glioma stem/progenitor cells (GSPCs) inhibits differentiation. Restoring PTEN function enhances autophagy and GSPC differentiation, suggesting PTEN and autophagy as potential glioma therapy targets.
Area of Science:
- Neuroscience
- Cell Biology
- Cancer Research
Background:
- Glioma stem/progenitor cells (GSPCs) share similarities with neural stem/progenitor cells (NSPCs).
- A key difference is GSPCs' inhibited differentiation.
- The molecular mechanisms underlying GSPC differentiation inhibition are not fully understood.
Purpose of the Study:
- To investigate the role of autophagy in GSPC differentiation.
- To elucidate the molecular mechanisms linking autophagy and GSPC differentiation.
- To explore PTEN's role in GSPC autophagy and differentiation.
Main Methods:
- Comparison of autophagic activity between GSPCs and NSPCs.
- Induction of GSPC differentiation using fetal calf serum (FCS).
- Pharmacological manipulation of autophagy using inhibitors (3-methyladenine, Bafilomycin A1) and an activator (Rapamycin).
- PTEN gene reintroduction into GSPCs.
Main Results:
- GSPCs exhibit significantly lower autophagic activity than NSPCs.
- FCS-induced GSPC differentiation is inhibited by autophagy inhibitors and promoted by Rapamycin.
- Restoring PTEN in GSPCs significantly enhances autophagic activity.
- Low autophagy in GSPCs correlates with inhibited differentiation, potentially due to PTEN loss.
Conclusions:
- Impaired autophagy contributes to the inhibition of GSPC differentiation.
- Loss of PTEN is a likely mechanism for reduced autophagy in GSPCs.
- Targeting autophagy and PTEN presents a potential therapeutic strategy for glioma.
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