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Yu G, Corn PG, Shen P, Song JH, Lee YC, Lin SC, Pan J, Agarwal SK, Panaretakis T, Pacifici M, Logothetis CJ, Yu-Lee LY, Lin SH. Retinoic Acid Receptor Activation Reduces Metastatic Prostate Cancer Bone Lesions by Blocking the Endothelial-to-Osteoblast Transition. Cancer Res 2022; 82:3158-3171. [PMID: 35802768 PMCID: PMC9444986 DOI: 10.1158/0008-5472.can-22-0170] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 05/11/2022] [Accepted: 07/06/2022] [Indexed: 02/05/2023]
Abstract
Metastatic prostate cancer in the bone induces bone-forming lesions that contribute to progression and therapy resistance. Prostate cancer-induced bone formation originates from endothelial cells (EC) that have undergone endothelial-to-osteoblast (EC-to-OSB) transition in response to tumor-secreted BMP4. Current strategies targeting prostate cancer-induced bone formation are lacking. Here, we show that activation of retinoic acid receptor (RAR) inhibits EC-to-OSB transition and reduces prostate cancer-induced bone formation. Treatment with palovarotene, an RARγ agonist being tested for heterotopic ossification in fibrodysplasia ossificans progressiva, inhibited EC-to-OSB transition and osteoblast mineralization in vitro and decreased tumor-induced bone formation and tumor growth in several osteogenic prostate cancer models, and similar effects were observed with the pan-RAR agonist all-trans-retinoic acid (ATRA). Knockdown of RARα, β, or γ isoforms in ECs blocked BMP4-induced EC-to-OSB transition and osteoblast mineralization, indicating a role for all three isoforms in prostate cancer-induced bone formation. Furthermore, treatment with palovarotene or ATRA reduced plasma Tenascin C, a factor secreted from EC-OSB cells, which may be used to monitor treatment response. Mechanistically, BMP4-activated pSmad1 formed a complex with RAR in the nucleus of ECs to activate EC-to-OSB transition. RAR activation by palovarotene or ATRA caused pSmad1 degradation by recruiting the E3-ubiquitin ligase Smad ubiquitination regulatory factor1 (Smurf1) to the nuclear pSmad1/RARγ complex, thus blocking EC-to-OSB transition. Collectively, these findings suggest that palovarotene can be repurposed to target prostate cancer-induced bone formation to improve clinical outcomes for patients with bone metastasis. SIGNIFICANCE This study provides mechanistic insights into how RAR agonists suppress prostate cancer-induced bone formation and offers a rationale for developing RAR agonists for prostate cancer bone metastasis therapy. See related commentary by Bhowmick and Bhowmick, p. 2975.
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Affiliation(s)
- Guoyu Yu
- Department of Translational Molecular Pathology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Paul G. Corn
- Department of Genitourinary Medical Oncology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Pengfei Shen
- Department of Translational Molecular Pathology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Jian H. Song
- Department of Genitourinary Medical Oncology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Yu-Chen Lee
- Department of Translational Molecular Pathology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Song-Chang Lin
- Department of Translational Molecular Pathology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Jing Pan
- Department of Genitourinary Medical Oncology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Sandeep K. Agarwal
- Department of Medicine, Section of Immunology Allergy & Rheumatology, Baylor College of Medicine; Houston, Texas 77030
| | - Theocharis Panaretakis
- Department of Genitourinary Medical Oncology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Maurizio Pacifici
- Translational Research Program in Pediatric Orthopaedics, The Children’s Hospital of Philadelphia; Philadelphia
| | - Christopher J. Logothetis
- Department of Genitourinary Medical Oncology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030
| | - Li-Yuan Yu-Lee
- Department of Medicine, Section of Immunology Allergy & Rheumatology, Baylor College of Medicine; Houston, Texas 77030,Co-Corresponding authors: Dr. Sue-Hwa Lin, Department of Translational Molecular Pathology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030. Phone: 713-794-1559; Fax: 713-834-6084; ; Dr. Li-yuan Yu-Lee, Department of Medicine, Section of Immunology Allergy & Rheumatology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030. Phone: 713-798-4770;
| | - Sue-Hwa Lin
- Department of Translational Molecular Pathology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030,Department of Genitourinary Medical Oncology, The University of Texas M. D. Anderson Cancer Center; Houston, Texas 77030,The University of Texas Graduate School of Biomedical Sciences at Houston; Houston, Texas.,Co-Corresponding authors: Dr. Sue-Hwa Lin, Department of Translational Molecular Pathology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030. Phone: 713-794-1559; Fax: 713-834-6084; ; Dr. Li-yuan Yu-Lee, Department of Medicine, Section of Immunology Allergy & Rheumatology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030. Phone: 713-798-4770;
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