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Updated: May 2, 2026
MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR
Published on: May 16, 2012
Targeting CXCR2 in prostate cancer cells can block CD47-SIRPα interaction and reverse M2 macrophage polarization in
Yi Sun1, Shangqing Ren2, Wei Wen3
1Department of Urology, Guangdong Provincial Key Laboratory of Urological Diseases, Guangdong Engineering Research Center of Urinary Minimally Invasive Surgery Robot and Intelligent Equipment, The First Affiliated Hospital of Guangzhou Medical University, 151 West Yanjiang Road, Guangzhou, Guangdong, 510230, China.
Abstract:
Neuroendocrine prostate cancer (NEPC) exhibits strong immune evasion and plays a critical role in regulating metabolic reprogramming within prostate cancer. High infiltration of CD36 + M2 tumour-associated macrophages (TAMs) and elevated CD47 expression in NEPC cells are often associated with poor progression-free survival in cancer patients. Understanding the mechanisms that regulate CD36 + M2 TAM infiltration and high CD47 expression in tumour cells within the prostate cancer tumour microenvironment (TME) is essential. Using cell models and two animal models, we discovered that the IL-8/CXCR2 pathway increases acetyl-CoA levels through metabolic reprogramming, which subsequently increases CD47 expression via acetylation. Moreover, this pathway modulates the membrane localization of CD47 by stimulating tumour cells to secrete palmitic acid and utilize palmitoylation mechanisms, thereby protecting tumour cells from macrophage-mediated phagocytosis. The IL-8/CXCR2 pathway also reshapes the metabolic microenvironment of the TME, increasing the infiltration of ω-3/6 polyunsaturated fatty acids (PUFAs) in the TME, which promotes the recruitment of CD36 + M2 TAMs. Preclinical studies in both NSG and C57BL/6 animal models demonstrated that targeting CXCR2 restored TAM phagocytic activity and significantly reduced tumour growth. These findings suggest that CXCR2-targeted immunotherapy holds promising therapeutic potential for prostate cancer and underscores its importance in translational medicine.
Insights
The IL-8/CXCR2 pathway drives neuroendocrine prostate cancer (NEPC) immune evasion by increasing CD47 expression and M2 macrophage infiltration. Targeting CXCR2 restores anti-tumor immunity and reduces tumor growth in preclinical models.
Area of Science:
- Oncology
- Immunology
- Metabolic Reprogramming
Background:
- Neuroendocrine prostate cancer (NEPC) is characterized by immune evasion and metabolic reprogramming.
- High CD36+ M2 tumor-associated macrophage (TAM) infiltration and elevated CD47 expression in NEPC cells correlate with poor patient survival.
- Understanding the regulation of TAM infiltration and CD47 expression in the prostate cancer tumor microenvironment (TME) is crucial.
Purpose of the Study:
- To elucidate the mechanisms regulating CD36+ M2 TAM infiltration and CD47 expression in NEPC.
- To investigate the role of the IL-8/CXCR2 pathway in NEPC progression and immune evasion.
- To evaluate the therapeutic potential of targeting the IL-8/CXCR2 pathway in prostate cancer.
Main Methods:
- Utilized cell models and two distinct animal models (NSG and C57BL/6) for investigation.
- Analyzed the IL-8/CXCR2 pathway's impact on acetyl-CoA levels, CD47 expression, and palmitoylation.
- Assessed the pathway's influence on the TME metabolic landscape and M2 TAM recruitment.
Main Results:
- The IL-8/CXCR2 pathway enhances acetyl-CoA levels via metabolic reprogramming, increasing CD47 expression through acetylation.
- This pathway promotes CD47 membrane localization via palmitic acid secretion and palmitoylation, protecting tumor cells from phagocytosis.
- The IL-8/CXCR2 pathway alters the TME, increasing polyunsaturated fatty acids (PUFAs) and promoting CD36+ M2 TAM infiltration.
- Targeting CXCR2 in preclinical models restored TAM phagocytic activity and significantly inhibited tumor growth.
Conclusions:
- The IL-8/CXCR2 pathway is a key regulator of immune evasion and metabolic reprogramming in NEPC.
- CD47 expression and M2 TAM infiltration are mechanistically linked to the IL-8/CXCR2 pathway.
- CXCR2-targeted immunotherapy presents a promising therapeutic strategy for prostate cancer, with significant translational potential.
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