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2015 ; 14
(ä): 56
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The autotaxin-lysophosphatidic acid-lysophosphatidic acid receptor cascade:
proposal of a novel potential therapeutic target for treating glioblastoma
multiforme
#MMPMID26084470
Tabuchi S
Lipids Health Dis
2015[Jun]; 14
(ä): 56
PMID26084470
show ga
Glioblastoma multiforme (GBM) is the most malignant tumor of the central nervous
system (CNS). Its prognosis is one of the worst among all cancer types, and it is
considered a fatal malignancy, incurable with conventional therapeutic
strategies. As the bioactive multifunctional lipid mediator lysophosphatidic acid
(LPA) is well recognized to be involved in the tumorigenesis of cancers by acting
on G-protein-coupled receptors, LPA receptor (LPAR) antagonists and LPA synthesis
inhibitors have been proposed as promising drugs for cancer treatment. Six LPARs,
named LPA1-6, are currently recognized. Among them, LPA1 is the dominant LPAR in
the CNS and is highly expressed in GBM in combination with the overexpression of
autotaxin (ATX), the enzyme (a phosphodiesterase, which is a potent cell
motility-stimulating factor) that produces LPA.Invasion is a defining hallmark of
GBM. LPA is significantly related to cell adhesion, cell motility, and invasion
through the Rho family GTPases Rho and Rac. LPA1 is responsible for LPA-driven
cell motility, which is attenuated by LPA4. GBM is among the most vascular human
tumors. Although anti-angiogenic therapy (through the inhibition of vascular
endothelial growth factor (VEGF)) was established, sufficient results have not
been obtained because of the increased invasiveness triggered by
anti-angiogenesis. As both ATX and LPA play a significant role in angiogenesis,
similar to VEGF, inhibition of the ATX/LPA axis may be beneficial as a
two-pronged therapy that includes anti-angiogenic and anti-invasion therapy.
Conventional approaches to GBM are predominantly directed at cell proliferation.
Recurrent tumors regrow from cells that have invaded brain tissues and are less
proliferative, and are thus quite resistant to conventional drugs and radiation,
which preferentially kill rapidly proliferating cells. A novel approach that
targets this invasive subpopulation of GBM cells may improve the prognosis of
GBM. Patients with GBM that contacts the subventricular zone (SVZ) have decreased
survival. A putative source of GBM cells is the SVZ, the largest area of
neurogenesis in the adult human brain. GBM stem cells in the SVZ that are
positive for the neural stem cell surface antigen CD133 are highly tumorigenic
and enriched in recurrent GBM. LPA1 expression appears to be increased in these
cells. Here, the author reviews research on the ATX/LPAR axis, focusing on GBM
and an ATX/LPAR-targeted approach.