在黑色素瘤进展中SPARC过度表达的调节机制
Antònia Vinyals1,2, Josep R Ferreres1,3, Rafael Campos-Martín4
1TGF-β and Cancer Group, Oncobell Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospital Duran i Reynals, L'Hospitalet de Llobregat, 08908 Barcelona, Spain.
International journal of molecular sciences
|September 13, 2025
概括
黑色素瘤的进展涉及增加的SPARC表达,由转录因子PRRX1和TCF7L2-Sp1.1驱动. 微RNA miR-29b1~a微调SPARC水平,影响黑色素瘤细胞表型和转移.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 在黑色素瘤进展过程中,分泌的蛋白质,酸性和丰富的氨酸 (SPARC) 表达升高.
- SPARC上调与上皮细胞转化为介质细胞转化 (EMT) 相相关,这是黑色素瘤转移的关键因素.
- 在黑色素瘤中控制SPARC表达的分子机制在很大程度上是未知的.
研究的目的:
- 阐明控制人类黑色素瘤中SPARC基因表达的分子机制.
- 确定关键的转录因子和参与SPARC在黑色素瘤进展过程中的上调调节的调控元素.
- 研究微RNAs在调节SPARC表达和黑色素瘤细胞表型中的作用.
主要方法:
- 通过促进体结合试验,确定PRRX1是SPARC的转录激活剂.
- 在临床黑色素瘤样本和细胞系中相关的SPARC和PRRX1表达.
- 研究了TCF7L2和Sp1与SPARC促进体结合的作用.
- 分析了miR-29家族成员与SPARC表达之间的调控关系.
主要成果:
- 一个EMT转录因子,配对相关的Homeobox 1 (PRRX1) 直接与SPARC促进体结合,激活其转录.
- 在黑色素瘤中,SPARC和PRRX1表达之间存在显著的正相关性.
- TCF7L2和Sp1结合了SPARC促销物,在表型转换到中酶体状态期间增强了表达.
- SPARC是miR-29家族的直接目标;miR-29b1~a的表达与SPARC水平相反相关,并在介质细胞黑色素瘤中减少.
结论:
- 黑色素瘤中的SPARC表达是由PRRX1,TCF7L2和Sp1.1转录激活的.
- MiR-29b1~a作为SPARC的负调节剂,微调黑色素瘤细胞的表型转变.
- 了解这些调节机制为黑色素瘤转移提供了潜在的治疗点.
相关概念视频
mTOR Signaling and Cancer Progression
4.6K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
4.6K
Abnormal Proliferation
5.1K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
5.1K
Induced Pluripotent Stem Cells
5.4K
Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
Somatic...
Somatic...
5.4K
Interactions Between Signaling Pathways
7.2K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
7.2K
Regulation of Expression at Multiple Steps
1.3K
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.3K
Regulation of Expression Occurs at Multiple Steps
25.7K
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
25.7K


