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2016 ; 55
(ä): 22-34
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Chemotherapy induces expression and release of heparanase leading to changes
associated with an aggressive tumor phenotype
#MMPMID27016342
Ramani VC
; Vlodavsky I
; Ng M
; Zhang Y
; Barbieri P
; Noseda A
; Sanderson RD
Matrix Biol
2016[Sep]; 55
(ä): 22-34
PMID27016342
show ga
High heparanase expression is associated with enhanced tumor growth,
angiogenesis, and metastasis in many types of cancer. However, the mechanisms
driving high heparanase expression are not fully understood. In the present
study, we discovered that drugs used in the treatment of myeloma upregulate
heparanase expression. Frontline anti-myeloma drugs, bortezomib and carfilzomib
activate the nuclear factor-kappa B (NF-?B) pathway to trigger heparanase
expression in tumor cells. Blocking the NF-?B pathway diminished this
chemotherapy-induced upregulation of heparanase expression. Activated NF-?B
signaling was also found to drive high heparanase expression in drug resistant
myeloma cell lines. In addition to enhancing heparanase expression, chemotherapy
also caused release of heparanase by tumor cells into the conditioned medium.
This soluble heparanase was taken up by macrophages and triggered an increase in
TNF-? production. Heparanase is also taken up by tumor cells where it induced
expression of HGF, VEGF and MMP-9 and activated ERK and Akt signaling pathways.
These changes induced by heparanase are known to be associated with the promotion
of an aggressive tumor phenotype. Importantly, the heparanase inhibitor
Roneparstat diminished the uptake and the downstream effects of soluble
heparanase. Together, these discoveries reveal a novel mechanism whereby
chemotherapy upregulates heparanase, a known promoter of myeloma growth, and
suggest that therapeutic targeting of heparanase during anti-cancer therapy may
improve patient outcome.