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2016 ; 18
(6
): 339-46
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Functional Studies on Primary Tubular Epithelial Cells Indicate a Tumor
Suppressor Role of SETD2 in Clear Cell Renal Cell Carcinoma
#MMPMID27292023
Li J
; Kluiver J
; Osinga J
; Westers H
; van Werkhoven MB
; Seelen MA
; Sijmons RH
; van den Berg A
; Kok K
Neoplasia
2016[Jun]; 18
(6
): 339-46
PMID27292023
show ga
SET domain-containing 2 (SETD2) is responsible for the trimethylation of histone
H3 lysine36 (H3K36me3) and is one of the genes most frequently mutated in clear
cell renal cell carcinoma (ccRCC). It is located at 3p21, one copy of which is
lost in the majority of ccRCC tumors, suggesting that SETD2 might function as a
tumor suppressor gene. However, the manner in which loss of SETD2 contributes to
ccRCC development has not been studied in renal primary tubular epithelial cells
(PTECs). Therefore, we studied the consequences of SETD2 knockdown through
lentiviral shRNA in human PTECs. Consistent with its known function, SETD2
knockdown (SETD-KD) led to loss of H3K36me3 in PTECs. In contrast to SETD2
wild-type PTECs, which have a limited proliferation capacity; the SETD2-KD PTECs
continued to proliferate. The expression profiles of SETD2-KD PTECs showed a
large overlap with the expression profile of early-passage, proliferating PTECs,
whereas nonproliferating PTECs showed a significantly different expression
profile. Gene set enrichment analysis revealed a significant enrichment of E2F
targets in SETD2-KD and proliferating PTECs as compared with nonproliferating
PTECs and in proliferating PTEC compared with SETD2-KD. The SETD2-KD PTECs
maintained low expression of CDKN2A and high expression of E2F1, whereas their
levels changed with continuing passages in untreated PTECs. In contrast to the
nonproliferating PTECs, SETD2-KD PTECs showed no ?-galactosidase staining,
confirming the protection against senescence. Our results indicate that SETD2
inactivation enables PTECs to bypass the senescence barrier, facilitating a
malignant transformation toward ccRCC.