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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 Am+J+Pathol
2016 ; 186
(3
): 678-90
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Inhibition of Transforming Growth Factor-? Activation Diminishes Tumor
Progression and Osteolytic Bone Disease in Mouse Models of Multiple Myeloma
#MMPMID26801735
Lu A
; Pallero MA
; Lei W
; Hong H
; Yang Y
; Suto MJ
; Murphy-Ullrich JE
Am J Pathol
2016[Mar]; 186
(3
): 678-90
PMID26801735
show ga
Transforming growth factor (TGF)-? supports multiple myeloma progression and
associated osteolytic bone disease. Conversion of latent TGF-? to its
biologically active form is a major regulatory node controlling its activity.
Thrombospondin1 (TSP1) binds and activates TGF-?. TSP1 is increased in myeloma,
and TSP1-TGF-? activation inhibits osteoblast differentiation. We hypothesized
that TSP1 regulates TGF-? activity in myeloma and that antagonism of the
TSP1-TGF-? axis inhibits myeloma progression. Antagonists (LSKL peptide,
SRI31277) derived from the LSKL sequence of latent TGF-? that block TSP1-TGF-?
activation were used to determine the role of the TSP1-TGF-? pathway in mouse
models of myeloma. TSP1 binds to human myeloma cells and activates TGF-? produced
by cultured human and mouse myeloma cell lines. Antagonists delivered via osmotic
pump in an intratibial severe combined immunodeficiency CAG myeloma model or in a
systemic severe combined immunodeficiency CAG-heparanase model of aggressive
myeloma reduced TGF-? signaling (phospho-Smad 2) in bone sections, tumor burden,
mouse IL-6, and osteoclasts, increased osteoblast number, and inhibited bone
destruction as measured by microcomputed tomography. SRI31277 reduced tumor
burden in the immune competent 5TGM1 myeloma model. SRI31277 was as effective as
dexamethasone or bortezomib, and SRI31277 combined with bortezomib showed greater
tumor reduction than either agent alone. These studies validate TSP1-regulated
TGF-? activation as a therapeutic strategy for targeted inhibition of TGF-? in
myeloma.