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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2015 ; 10
(5
): e0126440
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Rapid and Localized Mechanical Stimulation and Adhesion Assay: TRPM7 Involvement
in Calcium Signaling and Cell Adhesion
#MMPMID25946314
Nishitani WS
; Alencar AM
; Wang Y
PLoS One
2015[]; 10
(5
): e0126440
PMID25946314
show ga
A cell mechanical stimulation equipment, based on cell substrate deformation, and
a more sensitive method for measuring adhesion of cells were developed. A probe,
precisely positioned close to the cell, was capable of a vertical localized
mechanical stimulation with a temporal frequency of 207 Hz, and strain magnitude
of 50%. This setup was characterized and used to probe the response of Human
Umbilical Endothelial Vein Cells (HUVECs) in terms of calcium signaling. The
intracellular calcium ion concentration was measured by the genetically encoded
Cameleon biosensor, with the Transient Receptor Potential cation channel,
subfamily M, member 7 (TRPM7) expression inhibited. As TRPM7 expression also
regulates adhesion, a relatively simple method for measuring adhesion of cells
was also developed, tested and used to study the effect of adhesion alone. Three
adhesion conditions of HUVECs on polyacrylamide gel dishes were compared. In the
first condition, the substrate is fully treated with Sulfo-SANPAH crosslinking
and fibronectin. The other two conditions had increasingly reduced adhesion:
partially treated (only coated with fibronectin, with no use of Sulfo-SANPAH, at
5% of the normal amount) and non-treated polyacrylamide gels. The cells showed
adhesion and calcium response to the mechanical stimulation correlated to the
degree of gel treatment: highest for fully treated gels and lowest for
non-treated ones. TRPM7 inhibition by siRNA on HUVECs caused an increase in
adhesion relative to control (no siRNA treatment) and non-targeting siRNA, but a
decrease to 80% of calcium response relative to non-targeting siRNA which
confirms the important role of TRPM7 in mechanotransduction despite the increase
in adhesion.