Bellei Barbara, Migliano Emilia, Picardo Mauro
Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatological Institute, IRCCS, 00144 Rome, Italy.
Department of Plastic and Regenerative Surgery, San Gallicano Dermatological Institute, IRCCS, 00144 Rome, Italy.
Cancers (Basel). 2020 Nov 17;12(11):3400. doi: 10.3390/cancers12113400.
The development of a modified stromal microenvironment in response to neoplastic onset is a common feature of many tumors including cutaneous melanoma. At all stages, melanoma cells are embedded in a complex tissue composed by extracellular matrix components and several different cell populations. Thus, melanomagenesis is not only driven by malignant melanocytes, but also by the altered communication between melanocytes and non-malignant cell populations, including fibroblasts, endothelial and immune cells. In particular, cancer-associated fibroblasts (CAFs), also referred as melanoma-associated fibroblasts (MAFs) in the case of melanoma, are the most abundant stromal cells and play a significant contextual role in melanoma initiation, progression and metastasis. As a result of dynamic intercellular molecular dialogue between tumor and the stroma, non-neoplastic cells gain specific phenotypes and functions that are pro-tumorigenic. Targeting MAFs is thus considered a promising avenue to improve melanoma therapy. Growing evidence demonstrates that aberrant regulation of oncogenic signaling is not restricted to transformed cells but also occurs in MAFs. However, in some cases, signaling pathways present opposite regulation in melanoma and surrounding area, suggesting that therapeutic strategies need to carefully consider the tumor-stroma equilibrium. In this novel review, we analyze four major signaling pathways implicated in melanomagenesis, TGF-β, MAPK, Wnt/β-catenin and Hyppo signaling, from the complementary point of view of tumor cells and the microenvironment.
响应肿瘤发生而形成的改良基质微环境是包括皮肤黑色素瘤在内的许多肿瘤的共同特征。在所有阶段,黑色素瘤细胞都嵌入由细胞外基质成分和几种不同细胞群体组成的复杂组织中。因此,黑色素瘤的发生不仅由恶性黑色素细胞驱动,还由黑色素细胞与非恶性细胞群体(包括成纤维细胞、内皮细胞和免疫细胞)之间改变的通讯驱动。特别是,癌症相关成纤维细胞(CAF),在黑色素瘤的情况下也称为黑色素瘤相关成纤维细胞(MAF),是最丰富的基质细胞,在黑色素瘤的起始、进展和转移中发挥重要的背景作用。由于肿瘤与基质之间动态的细胞间分子对话,非肿瘤细胞获得了促肿瘤发生的特定表型和功能。因此,靶向MAF被认为是改善黑色素瘤治疗的一条有前途的途径。越来越多的证据表明,致癌信号的异常调节不仅限于转化细胞,也发生在MAF中。然而,在某些情况下,信号通路在黑色素瘤及其周围区域呈现相反的调节,这表明治疗策略需要仔细考虑肿瘤-基质平衡。在这篇新颖的综述中,我们从肿瘤细胞和微环境的互补角度分析了与黑色素瘤发生相关的四个主要信号通路,即TGF-β、MAPK、Wnt/β-连环蛋白和Hippo信号通路。
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