相关实验视频
Updated: Sep 13, 2025

03:20
Studying Chronic Exposure of Mice to Ultraviolet B Radiation
Published on: August 19, 2025
978
阿洛因通过调节集成信号通路来防止UVB诱导的亡
Qi He1, Yu-Pei Chen1,2,3, Chun Wu4
1The School of Public Health, Fujian Medical University, Fuzhou, China.
Frontiers in pharmacology
|July 28, 2025
概括
阿洛伊维拉的阿洛因通过减少氧化应激和预防亡来保护皮肤细胞免受UVB损伤. 这种化合物显示出作为治疗太阳引起的皮肤损伤的治疗剂的潜力.
科学领域:
- 皮肤病学 皮肤病学
- 生物化学 生物化学
- 细胞生物学 细胞生物学
背景情况:
- 紫外线B辐射会导致严重的皮肤损伤,包括氧化应激和亡.
- 阿洛因是来自阿洛伊的一种素,以其天然的特性而闻名.
- 了解阿洛因的光保护机制对于开发新的护肤疗法至关重要.
研究的目的:
- 研究阿洛因在HaCaT细胞中对UVB诱导的损伤的光保护作用.
- 阐明阿洛因的抗氧化能力及其在预防细胞亡中的作用.
- 探索阿洛因在对UVB暴露的反应中调节的分子通路.
主要方法:
- 抗氧化剂测定 (ABTS,DPPH) 和细胞内活性氧物种 (ROS) 测量.
- 西部斑点分析以评估p38和JNK酸化.
- 细胞活力 (MTT),细胞亡 (Hoechst,Calcein/PI染色,流细胞计) 的测试.
- 蛋白质组分析以确定调制的信号通路和蛋白质表达.
主要成果:
- 阿洛因表现出显著的抗氧化活性和剂量依赖性降低细胞内ROS.
- 阿洛因抑制了p38和JNK酸化,对p38.8有更强的作用.
- 阿洛因有效地减轻了UVB诱导的亡,并促进了细胞存活.
- 蛋白质组分析揭示了阿洛因调节的PI3K-Akt,p53和TGF-β通路,上调细胞循环/抗氧化蛋白,下调FOXO3.
结论:
- 阿洛因具有强大的光保护作用,可以防止UVB引起的皮肤损伤.
- 阿洛因的机制涉及抗氧化活性,抑制压力激活的激酶,以及关键生存途径的调节.
- 阿洛因证明了作为UVB诱导的皮肤损伤的治疗剂的潜力.
相关概念视频
The Intrinsic Apoptotic Pathway
6.9K
Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
6.9K
The Extrinsic Apoptotic Pathway
6.6K
The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
6.6K
Mutations
40.3K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
40.3K
Interactions Between Signaling Pathways
6.5K
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...
6.5K
Nucleotide Excision Repair
3.8K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
3.8K
Apoptosis
12.0K
Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size...
12.0K

