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Quantitative Immunohistochemistry of the Cellular Microenvironment in Patient Glioblastoma Resections
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Microtubule actin cross-linking factor 1, a novel target in glioblastoma

Najlaa Afghani1, Toral Mehta1, Jialiang Wang2

  • 1Department of Biological Sciences, Tennessee State University, Nashville, TN, USA.

International Journal of Oncology
|December 14, 2016
PubMed

Insights

Microtubule actin cross-linking factor 1 (MACF1) is upregulated in glioblastoma, promoting tumor growth. Inhibiting MACF1, alongside temozolomide (TMZ), offers a potential synergistic treatment strategy for glioblastoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Glioblastoma exhibits significant genetic heterogeneity, contributing to treatment resistance and poor survival rates.
  • Variations in protein expression, including spectraplakin protein microtubule actin cross-linking factor 1 (MACF1), are observed within and between glioblastoma tumors.
  • MACF1 expression is notably elevated in high-grade astrocytomas (grade III-IV) and glioblastoma (grade IV), but absent in normal brain tissue and lower-grade tumors.

Purpose of the Study:

  • To investigate the functional role of MACF1 in glioblastoma cell biology.
  • To determine if MACF1 can serve as a potential biomarker for glioblastoma.
  • To explore the synergistic therapeutic potential of targeting MACF1 in combination with temozolomide (TMZ).

Main Methods:

  • Expression analysis of MACF1 across various brain tumor grades and normal tissues.
  • Genetic inhibition of MACF1 in patient-derived xenograft and immortalized glioblastoma cell lines.
  • Assessment of MACF1 inhibition on glioblastoma cell proliferation and migration.
  • Evaluation of combined MACF1 silencing and TMZ treatment on glioblastoma cell proliferation.

Main Results:

  • MACF1 is predominantly expressed in high-grade astrocytomas and glioblastoma, distinguishing them from normal brain tissue and lower-grade tumors.
  • Suppression of MACF1 selectively inhibited glioblastoma cell proliferation and migration.
  • MACF1 inhibition led to the downregulation of Wnt-signaling mediators, Axin1 and β-catenin.
  • Combined MACF1 silencing and TMZ treatment synergistically reduced glioblastoma cell proliferation.

Conclusions:

  • MACF1 plays a significant role in glioblastoma tumor cell biology, influencing proliferation and migration.
  • MACF1 is a potential diagnostic biomarker for high-grade gliomas.
  • Targeting MACF1 synergistically with TMZ presents a promising combinatorial therapeutic strategy for glioblastoma.

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