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Isolation and characterization of novel RECK tumor suppressor gene splice variants

Marina Trombetta-Lima1,2, Sheila Maria Brochado Winnischofer3, Marcos Angelo Almeida Demasi1,2

  • 1Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, SP, 05508-000, Brazil.

Oncotarget
|October 3, 2015
PubMed

Insights

Canonical RECK expression and a higher ratio of canonical to alternative transcripts correlate with better glioblastoma multiforme survival. Alternative RECK variants may promote tumor growth, impacting prognosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Glioblastoma multiforme (GBM) is an aggressive brain tumor with poor prognosis.
  • RECK (Reversion-Inducing Cysteine-Rich Proteinous Knockoff) is known to suppress tumor invasion by inhibiting matrix metalloproteinases (MMPs).
  • Previous studies suggest RECK expression correlates with better outcomes in various cancers.

Purpose of the Study:

  • To investigate novel alternatively spliced variants of the RECK gene (RECK-B and RECK-I).
  • To determine the expression levels and profiles of canonical and alternative RECK transcripts in malignant astrocytomas.
  • To assess the prognostic significance of RECK expression and its variants in GBM patients.

Main Methods:

  • Isolation and sequencing of novel RECK variants (RECK-B, RECK-I) using RT-PCR.
  • Quantification of canonical and alternative RECK transcript expression via qRT-PCR in astrocytoma tissues and normal RNA panels.
  • Analysis of RECK-B overexpression effects on U87MG and T98G cell lines, including anchorage-independent growth and MMP expression.

Main Results:

  • Higher canonical RECK expression correlates with improved overall survival in GBM patients undergoing chemotherapy.
  • An elevated ratio of canonical to alternative RECK transcript expression is associated with better patient prognosis.
  • Overexpression of the RECK-B variant in GBM cells enhanced anchorage-independent growth without affecting MMP-2 or MMP-9 levels.

Conclusions:

  • Novel RECK transcript variants (RECK-B and RECK-I) have been identified.
  • The ratio of canonical to alternative RECK transcript expression may serve as a prognostic biomarker for GBM.
  • RECK transcript variants may play opposing roles in GBM pathogenesis, influencing tumor behavior and patient outcomes.
Keywords:
GBMMMPRECKisoformssplicing

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