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2015 ; 10
(9
): e0137692
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Overexpression of AQP3 Modifies the Cell Cycle and the Proliferation Rate of
Mammalian Cells in Culture
#MMPMID26367709
Galán-Cobo A
; Ramírez-Lorca R
; Serna A
; Echevarría M
PLoS One
2015[]; 10
(9
): e0137692
PMID26367709
show ga
Abnormal AQP3 overexpression in tumor cells of different origins has been
reported and a role for this enhanced AQP3 expression in cell proliferation and
tumor processess has been indicated. To further understand the role AQP3 plays in
cell proliferation we explore the effect that stable over expression of AQP3
produces over the proliferation rate and cell cycle of mammalian cells. The cell
cycle was analyzed by flow cytometry with propidium iodide (PI) and the cell
proliferation rate measured through cell counting and BrdU staining. Cells with
overexpression of AQP3 (AQP3-o) showed higher proliferation rate and larger
percentage of cells in phases S and G2/M, than wild type cells (wt). Evaluation
of the cell response against arresting the cell cycle with Nocodazole showed that
AQP3-o exhibited a less modified cell cycle pattern and lower Annexin V specific
staining than wt, consistently with a higher resistance to apoptosis of
AQP3-overexpressing cells. The cell volume and complexity were also larger in
AQP3-o compared to wt cells. After transcriptomic analysis, RT-qPCR was performed
to highlight key molecules implicated in cell proliferation which expression may
be altered by overexpression of AQP3 and the comparative analysis between both
type of cells showed significant changes in the expression of Zeb2, Jun, JunB,
NF-k?, Cxcl9, Cxcl10, TNF, and TNF receptors. We conclude that the role of AQP3
in cell proliferation seems to be connected to increments in the cell cycle
turnover and changes in the expression levels of relevant genes for this process.
Larger expression of AQP3 may confer to the cell a more tumor like phenotype and
contributes to explain the presence of this protein in many different tumors.