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相关概念视频

Tumor Immunotherapy01:27

Tumor Immunotherapy

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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Phosphoinositides and PIPs01:42

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Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against...
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Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
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脂外部化阻断作为一种抗瘤免疫疗法

Chao-Yuan Chang1

  • 1UPMC Hillman Cancer Center, University of Pittsburgh, PA, USA.

Biochemistry and cell biology = Biochimie et biologie cellulaire
|October 22, 2025
PubMed
概括

对瘤细胞的脂氨酸 (PS) 暴露抑制了抗瘤免疫力. 阻断PS外部化,特别是通过一种新的"PS全阻断"策略,增强免疫反应并抑制瘤生长,提供了一种有前途的免疫治疗方法.

科学领域:

  • 免疫学 免疫学 免疫学
  • 细胞生物学 细胞生物学
  • 癌症研究 癌症研究

背景情况:

  • 在真核细胞中,脂不对称性与脂素 (PS) 在内部等离子体膜传单上至关重要.
  • 在瘤微环境 (TME) 中,来自各种来源,包括通过Xkr8通过apoptotic细胞的PS暴露,促进免疫抑制.
  • 暴露的PS与细胞上的受体结合,如巨细胞和树突细胞 (DCs),诱导细胞和抗炎反应.

研究的目的:

  • 调查PS外部化在瘤免疫抑制中的作用.
  • 为了比较具有构成性PS暴露 (PSout) 的模型中的抗瘤免疫反应与保留的内部小册子PS (PSin).

主要方法:

  • 开发PSout瘤模型,通过删除PS转酶CDC50A.
  • 通过通过淘汰PS scamblase Xkr8.8来开发PS的瘤模型.
  • 在这些模型中分析了抗瘤免疫反应,包括巨细胞分化,T细胞透和NK细胞细胞毒性.

主要成果:

  • PSout瘤显示增强生长,M2极化瘤关联巨细胞 (TAMs),并减少T细胞透,由TAMs上的PS受体TIM-3调解.
  • 在PS瘤中,表现出抑制生长,M1极化TAMs,降低IL-10和增强NK细胞活性.

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  • 通过Xkr8抑制阻断PS外部化显示出抗瘤免疫疗法的潜力.

    • 结论:

    • 一种新的工程蛋白质,
    • 在PS全区块的PS上.
    • 它可以从所有来源中中和PS,而不会引发免疫抑制.
    • "PS全块"策略通过向所有PS来源,证明比Xkr8抑制对抗瘤免疫治疗更有效.