Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=29716623
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 269.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 302.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 302.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\29716623
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Exp+Clin+Cancer+Res
2018 ; 37
(1
): 94
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
miR-221 stimulates breast cancer cells and cancer-associated fibroblasts (CAFs)
through selective interference with the A20/c-Rel/CTGF signaling
#MMPMID29716623
Santolla MF
; Lappano R
; Cirillo F
; Rigiracciolo DC
; Sebastiani A
; Abonante S
; Tassone P
; Tagliaferri P
; Di Martino MT
; Maggiolini M
; Vivacqua A
J Exp Clin Cancer Res
2018[May]; 37
(1
): 94
PMID29716623
show ga
BACKGROUND: MicroRNA (miRNAs) are non-coding small RNA molecules that regulate
gene expression by inhibiting the translation of target mRNAs. Among several
dysregulated miRNAs in human cancer, the up-regulation of miR-221 has been
associated with development of a variety of hematologic and solid malignancies.
In this study, we investigated the involvement of miR-221 in breast cancer.
METHODS: TaqMan microRNA assay was used to detect the miR-221 levels in normal
cells and in MDA-MB 231 and SkBr3 breast cancer cells as well as in main players
of the tumor microenvironment, namely cancer-associated fibroblasts (CAFs).
miR-221 mimic sequence and locked nucleic acid (LNA)-i-miR-221 construct were
used to induce or inhibit, respectively, the miR-221 expression in cells used.
Quantitative PCR and western blotting analysis were performed to evaluate the
levels of the miR-221 target gene A20 (TNFAIP3), as well as the member of the
NF-kB complex namely c-Rel and the connective tissue growth factor (CTGF).
Chromatin immunoprecipitation (ChIP) assay was performed to ascertain the
recruitment of c-Rel to the CTFG promoter. Finally, the cell growth and migration
in the presence of LNA-i-miR-221 or silencing c-Rel and CTGF by specific short
hairpin were assessed by cell count, colony formation and boyden chambers assays.
Statistical analysis was performed by ANOVA. RESULTS: We first demonstrated that
LNA-i-miR-221 inhibits both endogenous and ectopic expression of miR-221 in our
experimental models. Next, we found that the A20 down-regulation, as well as the
up-regulation of c-Rel induced by miR-221 were no longer evident using
LNA-i-miR-221. Moreover, we established that the miR-221 dependent recruitment of
c-Rel to the NF-kB binding site located within the CTGF promoter region is
prevented by using LNA-i-miR-221. Furthermore, we determined that the
up-regulation of CTGF mRNA and protein levels by miR-221 is no longer evident
using LNA-i-miR221 and silencing c-Rel. Finally, we assessed that cell growth and
migration induced by miR-221 in MDA-MB 231 and SkBr3 breast cancer cells as well
as in CAFs are abolished by LNAi-miR-221 and silencing c-Rel or CTGF.
CONCLUSIONS: Overall, these data provide novel insights into the stimulatory
action of miR-221 in breast cancer cells and CAFs, suggesting that its inhibition
may be considered toward targeted therapeutic approaches in breast cancer
patients.