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2016 ; 7
(47
): 77696-77706
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Secreted protein acidic and rich in cysteine (SPARC) induces lipotoxicity in
neuroblastoma by regulating transport of albumin complexed with fatty acids
#MMPMID27776337
Chlenski A
; Dobratic M
; Salwen HR
; Applebaum M
; Guerrero LJ
; Miller R
; DeWane G
; Solomaha E
; Marks JD
; Cohn SL
Oncotarget
2016[Nov]; 7
(47
): 77696-77706
PMID27776337
show ga
SPARC is a matrix protein that mediates interactions between cells and the
microenvironment. In cancer, SPARC may either promote or inhibit tumor growth
depending upon the tumor type. In neuroblastoma, SPARC is expressed in the
stromal Schwannian cells and functions as a tumor suppressor. Here, we developed
a novel in vivo model of stroma-rich neuroblastoma using non-tumorigenic SHEP
cells with modulated levels of SPARC, mixed with tumorigenic KCNR cells. Tumors
with stroma-derived SPARC displayed suppressed growth, inhibited angiogenesis and
increased lipid accumulation. Based on the described chaperone function of SPARC,
we hypothesized that SPARC binds albumin complexed with fatty acids and
transports them to tumors. We show that SPARC binds albumin with Kd=18.9±2.3 uM,
and enhances endothelial cell internalization and transendothelial transport of
albumin in vitro. We also demonstrate that lipids induce toxicity in
neuroblastoma cells and show that lipotoxicity is increased when cells are
cultured in hypoxic conditions. Studies investigating the therapeutic potential
of SPARC are warranted.