前列腺成纤维细胞和前列腺癌相关成纤维细胞对缺氧表现出不同的代谢、基质降解和PD-L1表达反应。

Prostate fibroblasts and prostate cancer associated fibroblasts exhibit different metabolic, matrix degradation and PD-L1 expression responses to hypoxia.

作者信息

Pacheco-Torres Jesus, Sharma Raj Kumar, Mironchik Yelena, Wildes Flonne, Brennen W Nathaniel, Artemov Dmitri, Krishnamachary Balaji, Bhujwalla Zaver M

机构信息

Division of Cancer Imaging Research, The Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD, United States.

Instituto de Investigaciones Biomédicas Sols-Morreale, CSIC, Madrid, Spain.

出版信息

Front Mol Biosci. 2024 Mar 22;11:1354076. doi: 10.3389/fmolb.2024.1354076. eCollection 2024.

Abstract

Fibroblasts are versatile cells that play a major role in wound healing by synthesizing and remodeling the extracellular matrix (ECM). In cancers, fibroblasts play an expanded role in tumor progression and dissemination, immunosuppression, and metabolic support of cancer cells. In prostate cancer (PCa), fibroblasts have been shown to induce growth and increase metastatic potential. To further understand differences in the functions of human PCa associated fibroblasts (PCAFs) compared to normal prostate fibroblasts (PFs), we investigated the metabolic profile and ECM degradation characteristics of PFs and PCAFs using a magnetic resonance imaging and spectroscopy compatible intact cell perfusion assay. To further understand how PFs and PCAFs respond to hypoxic tumor microenvironments that are often observed in PCa, we characterized the effects of hypoxia on PF and PCAF metabolism, invasion and PD-L1 expression. We found that under normoxia, PCAFs displayed decreased ECM degradation compared to PFs. Under hypoxia, ECM degradation by PFs increased, whereas PCAFs exhibited decreased ECM degradation. Under both normoxia and hypoxia, PCAFs and PFs showed significantly different metabolic profiles. PD-L1 expression was intrinsically higher in PCAFs compared to PFs. Under hypoxia, PD-L1 expression increased in PCAFs but not in PFs. Our data suggest that PCAFs may not directly induce ECM degradation to assist in tumor dissemination, but may instead create an immune suppressive tumor microenvironment that further increases under hypoxic conditions. Our data identify the intrinsic metabolic, ECM degradation and PD-L1 expression differences between PCAFs and PFs under normoxia and hypoxia that may provide novel targets in PCa treatment.

摘要

成纤维细胞是多功能细胞,通过合成和重塑细胞外基质(ECM)在伤口愈合中起主要作用。在癌症中,成纤维细胞在肿瘤进展、扩散、免疫抑制以及癌细胞的代谢支持中发挥着更大的作用。在前列腺癌(PCa)中,成纤维细胞已被证明可诱导生长并增加转移潜能。为了进一步了解与正常前列腺成纤维细胞(PFs)相比,人PCa相关成纤维细胞(PCAFs)功能上的差异,我们使用磁共振成像和光谱兼容的完整细胞灌注测定法研究了PFs和PCAFs的代谢谱和ECM降解特征。为了进一步了解PFs和PCAFs如何应对PCa中常见的缺氧肿瘤微环境,我们表征了缺氧对PF和PCAF代谢、侵袭和PD-L1表达的影响。我们发现,在常氧条件下,与PFs相比,PCAFs的ECM降解减少。在缺氧条件下,PFs的ECM降解增加,而PCAFs的ECM降解减少。在常氧和缺氧条件下,PCAFs和PFs均显示出明显不同的代谢谱。与PFs相比,PCAFs中PD-L1的表达本质上更高。在缺氧条件下,PCAFs中PD-L1的表达增加,而PFs中则没有。我们的数据表明,PCAFs可能不会直接诱导ECM降解以协助肿瘤扩散,而是可能会创建一个免疫抑制性肿瘤微环境,在缺氧条件下该环境会进一步增强。我们的数据确定了常氧和缺氧条件下PCAFs和PFs之间在代谢、ECM降解和PD-L1表达方面的内在差异,这些差异可能为PCa治疗提供新的靶点。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fef7/10995317/e84a5c6fdabe/fmolb-11-1354076-g001.jpg

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