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The effect of the dual PI3K and mTOR inhibitor BEZ235 on tumour growth and osteolytic bone disease in multiple myeloma
Author(s) -
Gan Zhen Ying,
Fitter Stephen,
Vandyke Kate,
To Luen B.,
Zannettino Andrew C.W.,
Martin Sally K.
Publication year - 2015
Publication title -
european journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.904
H-Index - 84
eISSN - 1600-0609
pISSN - 0902-4441
DOI - 10.1111/ejh.12436
Subject(s) - osteoclast , pi3k/akt/mtor pathway , multiple myeloma , osteoblast , medicine , endocrinology , cancer research , bone disease , chemistry , biology , signal transduction , in vitro , osteoporosis , microbiology and biotechnology , receptor , biochemistry
The plasma cell malignancy multiple myeloma ( MM ) is unique among haematological malignancies in its capacity to cause osteoclast‐mediated skeletal destruction. The PI3K/Akt/ mTOR pathway mediates proliferation, survival and drug resistance in MM plasma cells and is also involved in regulating the formation and activity of bone‐forming osteoblasts and bone‐resorbing osteoclasts. NVP‐BEZ235 is a dual pan class I PI3K and mTOR inhibitor that is currently undergoing clinical evaluation in several tumour settings. In this study, we examined the anti‐tumorigenic effects of BEZ 235 in an immunocompetent mouse model of MM and assessed the effects of BEZ235 on osteoblast and osteoclast formation and function. BEZ235 treatment (50 mg/kg) resulted in a significant decrease in serum paraprotein and tumour burden, and μ CT analysis of the proximal tibia revealed a significant reduction in the number of osteolytic bone lesions in BEZ235‐treated animals. Levels of the serum osteoblast marker P1NP were significantly higher in BEZ235‐treated animals, while levels of the osteoclast marker TRAcP5 were reduced. In vitro , BEZ235 decreased MM plasma cell proliferation, osteoclast formation and function and promoted osteoblast formation and function. These findings suggest that, in addition to its anti‐tumour properties, BEZ235 could be useful in treating osteolytic bone disease in MM patients.