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2015 ; 18
(9
): 856-61
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Down-regulation of miR-135b in colon adenocarcinoma induced by a TGF-? receptor I
kinase inhibitor (SD-208)
#MMPMID26523217
Akbari A
; Ghahremani MH
; Mobini GR
; Abastabar M
; Akhtari J
; Bolhassani M
; Heidari M
Iran J Basic Med Sci
2015[Sep]; 18
(9
): 856-61
PMID26523217
show ga
OBJECTIVES: Transforming growth factor-? (TGF-?) is involved in colorectal cancer
(CRC). The SD-208 acts as an anti-cancer agent in different malignancies via
TGF-? signaling. This work aims to show the effect of manipulation of TGF-?
signaling on some miRNAs implicated in CRC. MATERIALS AND METHODS: We
investigated the effects of SD-208 on SW-48, a colon adenocarcinoma cell line.
The cell line was treated with 0.5, 1 and 2 ?M concentrations of SD-208. Then,
the xenograft model of colon cancer was established by subcutaneous inoculation
of SW-48 cell line into the nude mice. The animals were treated with SD-208 for
three weeks. A quantitative real-time PCR was carried out for expression level
analysis of selected oncogenic (miR-21, 31, 20a and 135b) and suppressor-miRNAs
(let7-g, miR-133b, 145 and 200c). Data were analyzed using the 2-??CT method
through student's t-test via the GraphPad Prism software. RESULTS: Our results
revealed that SD-208 could significantly down-regulate the expression of one key
onco-miRNA, miR-135b, in either SW-48 colon cells (P=0.006) or tumors
orthotopically implanted in nude mice (P=0.018). Our in silico study also
predicted that SD-208 could modulate the expression of potential downstream tumor
suppressor targets of the miR135b. CONCLUSION: Our data provide novel evidence
that anticancer effects of SD-208 (and likely other TGF-? inhibitors) may be
owing to their ability to regulate miRNAs expression.