Mobilization of monocytic myeloid-derived suppressor cells is regulated by PTH1R activation in bone marrow stromal cellsopen access
- Authors
- Lee, Eun Jung; Lee, Kyoung Jin; Jung, Seungpil; Park, Kyong Hwa; Park, Serk In
- Issue Date
- Apr-2023
- Publisher
- Nature Publishing Group
- Citation
- Bone Research, v.11, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- Bone Research
- Volume
- 11
- Number
- 1
- URI
- https://scholarworks.korea.ac.kr/kumedicine/handle/2021.sw.kumedicine/63010
- DOI
- 10.1038/s41413-023-00255-y
- ISSN
- 2095-4700
2095-6231
- Abstract
- Myeloid-derived suppressor cells (MDSCs) are bone marrow (BM)-derived immunosuppressive cells in the tumor microenvironment, but the mechanism of MDSC mobilization from the BM remains unclear. We investigated how BM stromal cell activation by PTH1R contributes to MDSC mobilization. PTH1R activation by parathyroid hormone (PTH) or PTH-related peptide (PTHrP), a tumor-derived counterpart, mobilized monocytic (M-) MDSCs from murine BM without increasing immunosuppressive activity. In vitro cell-binding assays demonstrated that alpha 4 beta 1 integrin and vascular cell adhesion molecule (VCAM)-1, expressed on M-MDSCs and osteoblasts, respectively, are key to M-MDSC binding to osteoblasts. Upon PTH1R activation, osteoblasts express VEGF-A and IL6, leading to Src family kinase phosphorylation in M-MDSCs. Src inhibitors suppressed PTHrP-induced MDSC mobilization, and Src activation in M-MDSCs upregulated two proteases, ADAM-17 and MMP7, leading to VCAM1 shedding and subsequent disruption of M-MDSC tethering to osteoblasts. Collectively, our data provide the molecular mechanism of M-MDSC mobilization in the bones of tumor hosts.
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- Appears in
Collections - 2. Clinical Science > Department of Medical Oncology and Hematology > 1. Journal Articles
- 2. Clinical Science > Department of Anesthesiology and Pain Medicine > 1. Journal Articles
- 3. Graduate School > Graduate School > 1. Journal Articles
- 1. Basic Science > Department of Biochemistry and Molecular Biology > 1. Journal Articles
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