Martin, Sally K.;
Fitter, Stephen;
El Khawanky, Nadia;
Grose, Randall H.;
Walkley, Carl R.;
Purton, Louise E.;
Ruegg, Markus A.;
Hall, Michael N.;
Gronthos, Stan;
Zannettino, Andrew C. W.
mTORC1 plays an important role in osteoblastic regulation of B-lymphopoiesis
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Media type:
E-Article
Title:
mTORC1 plays an important role in osteoblastic regulation of B-lymphopoiesis
Contributor:
Martin, Sally K.;
Fitter, Stephen;
El Khawanky, Nadia;
Grose, Randall H.;
Walkley, Carl R.;
Purton, Louise E.;
Ruegg, Markus A.;
Hall, Michael N.;
Gronthos, Stan;
Zannettino, Andrew C. W.
Published:
Springer Science and Business Media LLC, 2018
Published in:
Scientific Reports, 8 (2018) 1
Language:
English
DOI:
10.1038/s41598-018-32858-5
ISSN:
2045-2322
Origination:
Footnote:
Description:
AbstractSkeletal osteoblasts are important regulators of B-lymphopoiesis, serving as a rich source of factors such as CXCL12 and IL-7 which are crucial for B-cell development. Recent studies from our laboratory and others have shown that deletion of Rptor, a unique component of the mTORC1 nutrient-sensing complex, early in the osteoblast lineage development results in defective bone development in mice. In this study, we now demonstrate that mTORC1 signalling in pre-osteoblasts is required for normal B-lymphocyte development in mice. Targeted deletion of Rptor in osterix-expressing pre-osteoblasts (Rptorob−/−) leads to a significant reduction in the number of B-cells in the bone marrow, peripheral blood and spleen at 4 and 12 weeks of age. Rptorob−/− mice also exhibit a significant reduction in pre-B and immature B-cells in the BM, indicative of a block in B-cell development from the pro-B to pre-B cell stage. Circulating levels of IL-7 and CXCL12 are also significantly reduced in Rptorob−/− mice. Importantly, whilst Rptor-deficient osteoblasts are unable to support HSC differentiation to B-cells in co-culture, this can be rescued by the addition of exogenous IL-7 and CXCL12. Collectively, these findings demonstrate that mTORC1 plays an important role in extrinsic osteoblastic regulation of B-cell development.