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2017 ; 108
(4
): 547-552
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Oncogenic roles of SMARCB1/INI1 and its deficient tumors
#MMPMID28109176
Kohashi K
; Oda Y
Cancer Sci
2017[Apr]; 108
(4
): 547-552
PMID28109176
show ga
SMARCB1/INI1 is one of the core subunit proteins of the ATP-dependent SWI/SNF
chromatin remodeling complex, and is identified as a potent and bona fide tumor
suppressor. Interactions have been demonstrated between SMARCB1/INI1 and key
proteins in various pathways related to tumor proliferation and progression: the
p16-RB pathway, WNT signaling pathway, sonic hedgehog signaling pathway and
Polycomb pathway. Initially, no detectable SMARCB1/INI1 protein expression was
found in malignant rhabdoid tumor cells, whereas all other kinds of tumor cells
and non-tumorous tissue showed SMARCB1/INI1 protein expression. Therefore,
immunohistochemical testing for the SMARCB1/INI1 antibody has been considered
useful in confirming the histologic diagnosis of malignant rhabdoid tumors.
However, recently, aberrant expression of SMARCB1/INI1 has been found in various
tumors such as epithelioid sarcomas, schwannomatosis, synovial sarcomas, and so
on. In addition, it has been reported that aberrant expression can be classified
into three patterns: complete loss, mosaic expression and reduced expression.
Although the various pathways related to mechanisms of tumorigenesis and tumor
proliferation are complexly intertwined, the clarification of these mechanisms
may contribute to therapeutic strategies in SMARCB1/INI1-deficient tumors. In
terms of pathological classifications, SMARCB1/INI1-deficient tumors may be
re-classified by genetic backgrounds.