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2015 ; 4
(4
): 507-14
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Aberrant over-expression of TRPM7 ion channels in pancreatic cancer: required for
cancer cell invasion and implicated in tumor growth and metastasis
#MMPMID25770184
Yee NS
; Kazi AA
; Li Q
; Yang Z
; Berg A
; Yee RK
Biol Open
2015[Mar]; 4
(4
): 507-14
PMID25770184
show ga
Our previous studies in zebrafish development have led to identification of the
novel roles of the transient receptor potential melastatin-subfamily member 7
(TRPM7) ion channels in human pancreatic cancer. However, the biological
significance of TRPM7 channels in pancreatic neoplasms was mostly unexplored. In
this study, we determined the expression levels of TRPM7 in pancreatic tissue
microarrays and correlated these measurements in pancreatic adenocarcinoma with
the clinicopathological features. We also investigated the role of TRPM7 channels
in pancreatic cancer cell invasion using the Matrigel(TM)-coated transwell assay.
In normal pancreas, TRPM7 is expressed at a discernable level in the ductal cells
and centroacinar cells and at a relatively high level in the islet endocrine
cells. In chronic pancreatitis, pre-malignant tissues, and malignant neoplasms,
there is variable expression of TRPM7. In the majority of pancreatic
adenocarcinoma specimens examined, TRPM7 is expressed at either moderate-level or
high-level. Anti-TRPM7 immunoreactivity in pancreatic adenocarcinoma
significantly correlates with the size and stages of tumors. In human pancreatic
adenocarcinoma cells in which TRPM7 is highly expressed, short hairpin
RNA-mediated suppression of TRPM7 impairs cell invasion. The results demonstrate
that TRPM7 channels are over-expressed in a proportion of the pre-malignant
lesions and malignant tumors of the pancreas, and they are necessary for invasion
by pancreatic cancer cells. We propose that TRPM7 channels play important roles
in development and progression of pancreatic neoplasm, and they may be explored
as clinical biomarkers and targets for its prevention and treatment.