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Oncogenic roles of SMARCB1/INI1 and its deficient tumors

Kenichi Kohashi1, Yoshinao Oda1

  • 1Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.

Cancer Science
|January 22, 2017
PubMed

Insights

SMARCB1/INI1 protein, a tumor suppressor, is crucial in various cancer pathways. Its loss or aberrant expression in tumors like malignant rhabdoid tumors and epithelioid sarcomas impacts diagnosis and may guide new therapeutic strategies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • SMARCB1/INI1 is a core subunit of the SWI/SNF chromatin remodeling complex and a known tumor suppressor.
  • SMARCB1/INI1 interacts with key proteins in pathways regulating tumor proliferation, including p16-RB, WNT, sonic hedgehog, and Polycomb.
  • Initially, loss of SMARCB1/INI1 expression was characteristic of malignant rhabdoid tumors, aiding diagnosis via immunohistochemistry.

Purpose of the Study:

  • To investigate the role and expression patterns of SMARCB1/INI1 in various tumor types.
  • To understand the implications of aberrant SMARCB1/INI1 expression for tumor diagnosis and classification.
  • To explore how clarifying SMARCB1/INI1's role in tumorigenesis can inform therapeutic strategies for deficient tumors.

Main Methods:

  • Review of existing literature on SMARCB1/INI1 expression in different tumors.
  • Analysis of immunohistochemical findings for SMARCB1/INI1 antibody.
  • Examination of SMARCB1/INI1's interactions within cellular signaling pathways.

Main Results:

  • Aberrant SMARCB1/INI1 expression is now recognized in tumors beyond malignant rhabdoid tumors, including epithelioid sarcomas, schwannomatosis, and synovial sarcomas.
  • Aberrant expression patterns include complete loss, mosaic expression, and reduced expression of SMARCB1/INI1.
  • The complex interplay of pathways involving SMARCB1/INI1 in tumorigenesis is being elucidated.

Conclusions:

  • Immunohistochemical detection of SMARCB1/INI1 is essential for diagnosing malignant rhabdoid tumors but requires careful interpretation due to aberrant expression in other cancers.
  • Understanding the diverse patterns of SMARCB1/INI1 deficiency and its pathway interactions is critical for developing targeted therapies for SMARCB1/INI1-deficient tumors.
  • Future pathological classifications may incorporate genetic backgrounds to better categorize SMARCB1/INI1-deficient tumors.
Keywords:
Atypical teratoid/rhabdoid tumorMalignant rhabdoid tumorSMARCB1/INI1SWI/SNFchromatin remodeling

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