双特异性酸酶DUSP21是一种STAT3的新型负反调节剂
Shota Shikata1, Kazuna Kikkawa1, Masahiro Fujimuro1
1Department of Cell Biology, Kyoto Pharmaceutical University, Kyoto, 607-8412, Japan.
Biochemical and biophysical research communications
|February 17, 2025
概括
白血病抑制因子 (LIF) 诱导DUSP21,一种非典型的双特异性酸酶 (aDUSP),它抑制了LIF/STAT3信号通路. DUSP21直接去化STAT3,抑制其转录活动.
科学领域:
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
- 酶学 是一种酶学.
背景情况:
- 双特异性酸酶 (DUSP) 是一种酶,可以从氨酸和氨酸/氨酸残留物中去除酸盐组.
- 非典型的DUSP (aDUSP) 缺乏保存的基质结合基因,这表明基质特异性更广泛.
- 信号转换器和转录3激活器 (STAT3) 途径对细胞生长和生存至关重要.
研究的目的:
- 研究DUSP21在白血病抑制因子 (LIF) 信号通路中的作用.
- 为了确定DUSP21是否与STAT3.3相互作用和脱.
- 阐明DUSP21在STAT3激活和下游效应中的调节功能.
主要方法:
- 在HeLa细胞中通过LIF诱导DUSP21.
- 在使用过度表达系统的DUSP21和STAT3之间进行了同局部化和相互作用研究.
- 在实验室中使用重组DUSP21和STAT3.3进行脱化试验.
- 在Ba/F3-G133细胞中评估STAT3依赖细胞生长调节.
主要成果:
- 在HeLa细胞中,DUSP21表达是由LIF诱导的.
- 过度表达的DUSP21与STAT3.3共同定位并与之相互作用.
- 复合DUSP21在体外直接去化STAT3.
- DUSP21过度表达抑制了STAT3依赖的细胞生长.
结论:
- 由LIF诱导的DUSP21会对LIF/STAT3信号通路产生负面调节.
- DUSP21作为一种直接的STAT3酸酶,抑制STAT3的转录活性.
- DUSP21的功能是抑制STAT3介导的细胞过程.
相关概念视频
The JAK-STAT Signaling Pathway
8.6K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
8.6K
PI3K/mTOR/AKT Signaling Pathway
3.4K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.4K
Amplifying Signals via Enzymatic Cascade
8.2K
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
8.2K
Negative Regulator Molecules
35.1K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.1K
Interactions Between Signaling Pathways
6.2K
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...
6.2K
mTOR Signaling and Cancer Progression
3.7K
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...
3.7K


