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2017 ; 8
(10
): e3098
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The level of caveolin-1 expression determines response to TGF-? as a tumour
suppressor in hepatocellular carcinoma cells
#MMPMID29022911
Moreno-Càceres J
; Caballero-Díaz D
; Nwosu ZC
; Meyer C
; López-Luque J
; Malfettone A
; Lastra R
; Serrano T
; Ramos E
; Dooley S
; Fabregat I
Cell Death Dis
2017[Oct]; 8
(10
): e3098
PMID29022911
show ga
Hepatocellular carcinoma (HCC) is a heterogeneous tumour associated with poor
prognostic outcome. Caveolin-1 (CAV1), a membrane protein involved in the
formation of caveolae, is frequently overexpressed in HCC. Transforming growth
factor-beta (TGF-?) is a pleiotropic cytokine having a dual role in
hepatocarcinogenesis: inducer of apoptosis at early phases, but pro-tumourigenic
once cells acquire mechanisms to overcome its suppressor effects. Apoptosis
induced by TGF-? is mediated by upregulation of the NADPH oxidase NOX4, but
counteracted by transactivation of the epidermal growth factor receptor (EGFR)
pathway. Previous data suggested that CAV1 is required for the anti-apoptotic
signals triggered by TGF-? in hepatocytes. Whether this mechanism is relevant in
hepatocarcinogenesis has not been explored yet. Here we analysed the TGF-?
response in HCC cell lines that express different levels of CAV1. Accordingly,
stable CAV1 knockdown or overexpressing cell lines were generated. We demonstrate
that CAV1 is protecting HCC cells from TGF-?-induced apoptosis, which attenuates
its suppressive effect on clonogenic growth and increases its effects on cell
migration. Downregulation of CAV1 in HLE cells promotes TGF-?-mediated induction
of the pro-apoptotic BMF, which correlates with upregulation of NOX4, whereas
CAV1 overexpression in Huh7 cells shows the opposite effect. CAV1 silenced HLE
cells show attenuation in TGF-?-induced EGFR transactivation and activation of
the PI3K/AKT pathway. On the contrary, Huh7 cells, which do not respond to TGF-?
activating the EGFR pathway, acquire the capacity to do so when CAV1 is
overexpressed. Analyses in samples from HCC patients revealed that tumour tissues
presented higher expression levels of CAV1 compared with surrounding non-tumoural
areas. Furthermore, a significant positive correlation among the expression of
CAV1 and TGFB1 was observed. We conclude that CAV1 has an essential role in
switching the response to TGF-? from cytostatic to tumourigenic, which could have
clinical meaning in patient stratification.
|Adaptor Proteins, Signal Transducing/metabolism
[MESH]