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Lipid programs in melanocyte transformation

黑素细胞转化中的脂质程序

基本信息

批准号：
10577754
负责人：
Michael H. Overholtzer
金额：
$ 40.26万
依托单位：
SLOAN-KETTERING INST CAN RESEARCH
依托单位国家：
美国
项目类别：
财政年份：
2020
资助国家：
美国
起止时间：
2020-03-01 至 2025-02-28
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10577754
关键词：
Acceleration Acetyl Coenzyme A Adipocytes Affect Award Catecholamines Cell Culture Techniques Cell Line Cell secretion Cells Complement Coupled Cyclic AMP Cyclic AMP-Dependent Protein Kinases Cyclic GMP DNA Sequence Alteration Data Dermal Embryo Enzymes Epigenetic Process Event Extracellular Space Fatty Acids Funding Gene Expression Genes Genetic Genetic Transcription Glucose Goals Growth Histone Acetylation Human In Vitro Interruption Invaded Knock-out Knockout Mice Link Lipids Lipolysis MAP Kinase Gene Malignant - descriptor Malignant Neoplasms Mediating Medium chain fatty acid Melanins Melanoma Cell Metabolism Modeling Nature Neural Crest Oncogenic Pigments Production Proliferating Proteins Role Science Signal Induction Signal Transduction Skin Skin Tissue Somatic Mutation Source Subcutaneous Tissue Testing Tissue Model Tissues Transgenic Organisms Translations Validation Work Zebrafish cell behavior fatty acid-transport protein histone acetyltransferase human disease human tissue in vivo long chain fatty acid melanocyte melanoma mouse model neoplastic cell non-genetic overexpression oxidation pharmacologic programs promoter subcutaneous therapeutic target transgene expression tumor uptake

项目摘要

The transformation of a normal melanocyte into a melanoma requires factors above and beyond genetic mutations. We have identified lipids from subcutaneous adipocytes as one such contributing factor. When nascent melanoma cells come into contact with these adipocytes, they induce lipolysis and release of fatty acids into the extracellular space. These lipids are then directly taken up into the melanoma cell through FATP1 (Fatty Acid Transport Protein 1). Using a zebrafish model of melanoma coupled with validation in human tissues, we show that genetic and pharmacologic manipulation of FAPT1 interrupts the crosstalk between adipocytes and melanoma. Once inside the melanoma cell, these fatty acids undergo β-oxidation and can fuel tumor proliferation and invasion programs. One end product of this metabolism is the production of acetyl-CoA, which we find can be used to modify histone acetylation within the melanoma cell and lead to widespread changes in gene expression. Despite the importance of the interaction between adipocytes and melanoma cells, it is unknown what signals mediate this cross-talk, or how these lipids are used by the melanoma cell to drive progression. In this proposal, we will take advantage of the complementary strengths of the zebrafish model and human cell culture models to elucidate these mechanisms. In Aim 1, we will test whether catecholamines secreted from melanoma cells, which occurs as a byproduct of melanin synthesis can induce lipolytic programs in the adipocytes. In Aim 2, we will use the rapid transgenic capabilities of the zebrafish to test whether adipocyte-specific knockout of the lipolytic enzyme ATGL abrogates melanoma growth and progression. This will be complemented using an ATGL knockout mouse melanoma model. Finally, in Aim 3 we will determine the mechanisms by which fatty acid derived acetyl-CoA modulates histone acetylation and melanoma cell behavior. These studies will highlight the way in which factors such as lipids from the microenvironment can reprogram tumor cells to enable malignant transformation. Identifying these mechanisms will provide new opportunities for therapeutic targeting of this cross-talk.

正常黑素细胞转化为黑色素瘤需要基因突变以外的因素。我们已经确定了来自皮下脂肪细胞的脂质是一个这样的促成因素。当新生的黑色素瘤细胞与这些脂肪细胞接触时，它们诱导脂解并将脂肪酸释放到细胞外空间。然后这些脂质通过FATP 1（脂肪酸转运蛋白1）直接进入黑色素瘤细胞。使用斑马鱼模型的黑色素瘤加上在人体组织中的验证，我们表明，遗传和药理学操纵FAPT 1中断脂肪细胞和黑色素瘤之间的串扰。一旦进入黑色素瘤细胞，这些脂肪酸就会发生β-氧化，并可以促进肿瘤增殖和侵袭程序。这种代谢的一个最终产物是乙酰辅酶A的产生，我们发现它可以用来修饰黑色素瘤细胞内的组蛋白乙酰化，并导致基因表达的广泛变化。尽管脂肪细胞和黑色素瘤细胞之间的相互作用很重要，但尚不清楚是什么信号介导了这种串扰，或者黑色素瘤细胞如何使用这些脂质来推动进展。在这项提议中，我们将利用斑马鱼模型和人类细胞培养模型的互补优势来阐明这些机制。在目标1中，我们将测试从黑色素瘤细胞分泌的作为黑色素合成的副产物的儿茶酚胺是否可以诱导脂肪细胞中的脂解程序。在目标2中，我们将使用斑马鱼的快速转基因能力来测试脂肪细胞特异性敲除脂肪分解酶ATGL是否消除黑色素瘤的生长和进展。这将使用ATGL敲除小鼠黑色素瘤模型进行补充。最后，在目标3中，我们将确定脂肪酸衍生的乙酰辅酶A调节组蛋白乙酰化和黑色素瘤细胞行为的机制。这些研究将突出微环境中的脂质等因素可以重新编程肿瘤细胞以实现恶性转化的方式。确定这些机制将为这种串扰的治疗靶向提供新的机会。