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Characterization of Functionally Associated miRNAs in Glioblastoma and their Engineering into Artificial Clusters for Gene Therapy
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MicroRNA-210 and Endoplasmic Reticulum Chaperones in the Regulation of Chemoresistance in Glioblastoma

Derek Lee1, Stella Sun1, Xiao Qin Zhang1

  • 1Department of Surgery, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong.

Journal of Cancer
|February 10, 2015
PubMed

Insights

MicroRNA-210 (miR-210) downregulation contributes to temozolomide (TMZ) resistance in glioblastoma multiforme (GBM) by increasing P4HB chaperone expression. Restoring miR-210 levels sensitizes GBM cells to TMZ therapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Glioblastoma multiforme (GBM) is a primary brain tumor known for frequent recurrence.
  • Temozolomide (TMZ) resistance is a major challenge in GBM treatment.
  • Prolyl 4-hydroxylase, beta polypeptide (P4HB), an endoplasmic reticulum chaperone, is upregulated in TMZ-resistant GBM.

Purpose of the Study:

  • To investigate the role of microRNAs (miRNAs) in P4HB upregulation and GBM chemoresistance.
  • To explore the relationship between miR-210 and P4HB in TMZ-resistant GBM cells.

Main Methods:

  • Expression analysis of miR-210 and P4HB in TMZ-resistant GBM cells and clinical specimens.
  • Functional studies involving forced overexpression of miR-210.
  • Validation of the targeting relationship between miR-210 and P4HB.

Main Results:

  • miR-210 was found to target P4HB and was significantly downregulated in TMZ-resistant GBM cells.
  • Overexpression of miR-210 reduced P4HB levels and decreased TMZ resistance in GBM cells.
  • A reciprocal expression pattern between miR-210 and P4HB was observed in clinical glioma samples.

Conclusions:

  • This study establishes a novel link between miR-210 and ER chaperone P4HB in regulating GBM chemosensitivity.
  • The findings suggest that miR-210 may serve as a potential therapeutic target to overcome TMZ resistance in GBM.
  • Further research into this pathway could lead to new treatment strategies for glioblastoma.
Keywords:
ER stress reponseGlioblastomaP4HBchemoresistancemiRNAtemozolomide

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