通过调节p38激活,PIK-III在激活的纤维细胞中发挥抗纤维性作用
Santiago Sanchez1, Aaron K McDowell-Sanchez1, Sharaz B Al-Meerani1
1Section of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Baylor College of Medicine, Houston, TX, United States of America.
PloS one
|September 6, 2024
概括
化合物PIK-III通过抑制纤维细胞激活和p38信号传递,在全身性硬化症 (SSc) 中表现出强大的抗纤维素作用. 这种新的治疗方法在临床前模型中显著减少了皮肤和肺组织纤维化.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 药理学 药理学是指药理学的学科.
背景情况:
- 系统性硬化症 (SSc) 是一种自身免疫性疾病,其特征是皮肤和内脏器官纤维化.
- 纤维细胞通过产生细胞外基质 (ECM) 蛋白质和经历肌纤维细胞分化来驱动SSc的进展.
- 向纤维细胞激活是治疗SSc.的一个关键策略.
研究的目的:
- 在系统性硬化症中研究III类酸丁醇3-激酶 (PIK3C3/VPS34) 抑制剂PIK-III的抗纤维作用.
- 阐明PIK-III在抑制纤维细胞激活中的作用机制.
- 在SSc的临床前模型中评估PIK-III的治疗潜力.
主要方法:
- 用PIK-III和转化生长因子β1 (TGF-β1) 治疗人类皮肤纤维细胞 (HDF).
- 评估ECM表达,细胞收缩和肌纤维细胞分化.
- 基因沉默PIK3C3和使用其他PIK3C3抑制剂 (SAR405,Autophinib).
- 对p38激活通路的分析.
- 在白素诱导的皮肤和肺纤维化小鼠模型中使用PIK-III.
主要成果:
- PIK-III通过减弱TGF-β1诱导的ECM表达,细胞收缩和肌纤维细胞分化,在HDF中表现出强大的抗纤维作用.
- 对PIK3C3和其他PIK3C3抑制剂的基因沉默没有复制PIK-III的抗纤维素作用,这表明PIK3C3独立的机制.
- 发现PIK-III可以抑制TGF-β1刺激皮肤纤维细胞中的p38激活.
- 在白素受伤的小鼠中,PIK-III的使用显著降低了皮肤和肺纤维化.
结论:
- 在SSc模型中,PIK-III表现出显著的抗纤维素特性.
- PIK-III的抗纤维机制涉及抑制p38激活,独立于PIK3C3抑制.
- PIK-III代表了治疗系统性硬化症纤维化的有希望的治疗候选者.
相关概念视频
The JAK-STAT Signaling Pathway
8.7K
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...
8.7K
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
TGF - β Signaling Pathway
7.3K
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
7.3K
MAPK Signaling Cascades
5.3K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
5.3K
Introduction to Fibroblasts
3.0K
Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
3.0K
cAMP-dependent Protein Kinase Pathways
6.2K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
6.2K


