PMID- 33848267 OWN - NLM STAT- MEDLINE DCOM- 20211005 LR - 20211005 IS - 1558-8238 (Electronic) IS - 0021-9738 (Print) IS - 0021-9738 (Linking) VI - 131 IP - 10 DP - 2021 May 17 TI - Myeloid cell-derived PROS1 inhibits tumor metastasis by regulating inflammatory and immune responses via IL-10. LID - 126089 [pii] LID - 10.1172/JCI126089 [doi] LID - e126089 AB - Stimulation of TAM (TYRO3, AXL, and MERTK) receptor tyrosine kinases promotes tumor progression through numerous cellular mechanisms. TAM cognate ligands GAS6 and PROS1 (for TYRO3 and MERTK) are secreted by host immune cells, an interaction which may support tumor progression. Here, we revealed an unexpected antimetastatic role for myeloid-derived PROS1: suppressing metastatic potential in lung and breast tumor models. Pros1 deletion in myeloid cells led to increased lung metastasis, independent of primary tumor infiltration. PROS1-cKO bone marrow-derived macrophages (BMDMs) led to elevated TNF-alpha, IL-6, Nos2, and IL-10 via modulation of the Socs3/NF-kappaB pathway. Conditioned medium from cKO BMDMs enhanced EMT, ERK, AKT, and STAT3 activation within tumor cells and promoted IL-10-dependent invasion and survival. Macrophages isolated from metastatic lungs modulated T cell proliferation and function, as well as expression of costimulatory molecules on DCs in a PROS1-dependent manner. Inhibition of MERTK kinase activity blocked PROS1-mediated suppression of TNF-alpha and IL-6 but not IL-10. Overall, using lung and breast cancer models, we identified the PROS1/MERTK axis within BMDMs as a potent regulator of adaptive immune responses with a potential to suppress metastatic seeding and revealed IL-10 regulation by PROS1 to deviate from that of TNF-alpha and IL-6. FAU - Maimon, Avi AU - Maimon A AD - The Institute for Dental Sciences, Faculty of Dental Medicine and. FAU - Levi-Yahid, Victor AU - Levi-Yahid V AD - The Institute for Dental Sciences, Faculty of Dental Medicine and. FAU - Ben-Meir, Kerem AU - Ben-Meir K AD - The Lautenberg Center for Immunology and Cancer Research, Israel-Canada Medical Research Institute, Faculty of Medicine, the Hebrew University, Jerusalem, Israel. FAU - Halpern, Amit AU - Halpern A AD - The Institute for Dental Sciences, Faculty of Dental Medicine and. FAU - Talmi, Ziv AU - Talmi Z AD - The Institute for Dental Sciences, Faculty of Dental Medicine and. FAU - Priya, Shivam AU - Priya S AD - The Institute for Dental Sciences, Faculty of Dental Medicine and. FAU - Mizraji, Gabriel AU - Mizraji G AD - The Institute for Dental Sciences, Faculty of Dental Medicine and. FAU - Mistriel-Zerbib, Shani AU - Mistriel-Zerbib S AD - The Lautenberg Center for Immunology and Cancer Research, Israel-Canada Medical Research Institute, Faculty of Medicine, the Hebrew University, Jerusalem, Israel. FAU - Berger, Michael AU - Berger M AD - The Lautenberg Center for Immunology and Cancer Research, Israel-Canada Medical Research Institute, Faculty of Medicine, the Hebrew University, Jerusalem, Israel. FAU - Baniyash, Michal AU - Baniyash M AD - The Lautenberg Center for Immunology and Cancer Research, Israel-Canada Medical Research Institute, Faculty of Medicine, the Hebrew University, Jerusalem, Israel. FAU - Loges, Sonja AU - Loges S AD - Division of Personalized Medical Oncology (A420), German Cancer Research Center (DKFZ), Heidelberg, Germany. AD - Department of Personalized Oncology, University Hospital Mannheim, Mannheim, Germany. FAU - Burstyn-Cohen, Tal AU - Burstyn-Cohen T AD - The Institute for Dental Sciences, Faculty of Dental Medicine and. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Clin Invest JT - The Journal of clinical investigation JID - 7802877 RN - 0 (Calcium-Binding Proteins) RN - 0 (IL10 protein, mouse) RN - 0 (Interleukin-6) RN - 0 (Neoplasm Proteins) RN - 0 (Pros1 protein, mouse) RN - 0 (Tumor Necrosis Factor-alpha) RN - 0 (interleukin-6, mouse) RN - 130068-27-8 (Interleukin-10) SB - IM MH - Animals MH - Calcium-Binding Proteins/genetics/*immunology MH - Female MH - Interleukin-10/genetics/*immunology MH - Interleukin-6/genetics/immunology MH - Lung Neoplasms/genetics/*immunology MH - Mammary Neoplasms, Experimental/genetics/*immunology MH - Mice MH - Neoplasm Metastasis MH - Neoplasm Proteins/genetics/*immunology MH - Tumor Necrosis Factor-alpha/genetics/immunology MH - Tumor-Associated Macrophages/*immunology PMC - PMC8121514 OTO - NOTNLM OT - Inflammation OT - Macrophages OT - Oncology COIS- Conflict of interest: The authors have declared that no conflict of interest exists. EDAT- 2021/04/14 06:00 MHDA- 2021/10/06 06:00 PMCR- 2021/08/17 CRDT- 2021/04/13 17:12 PHST- 2018/11/12 00:00 [received] PHST- 2021/04/07 00:00 [accepted] PHST- 2021/04/14 06:00 [pubmed] PHST- 2021/10/06 06:00 [medline] PHST- 2021/04/13 17:12 [entrez] PHST- 2021/08/17 00:00 [pmc-release] AID - 126089 [pii] AID - 10.1172/JCI126089 [doi] PST - ppublish SO - J Clin Invest. 2021 May 17;131(10):e126089. doi: 10.1172/JCI126089.