果类动物模型揭示了氧体生物发生障碍中对脂和脂的基质道效应
bioRxiv : the preprint server for biology
|May 15, 2024
概括
过氧体生物发生障碍 (PBD-ZSD) 破坏脂质代谢,导致广泛的细胞膜异常. 这项研究揭示了在模型和人体血中改变的脂和胺乙烯链长度,影响神经系统功能.
科学领域:
- 生物化学 生物化学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 过氧体生物发生障碍 (PBD-ZSD) 是一种影响过氧体形成的遗传缺陷.
- 临床诊断依赖于生物标志物,如高度的非常长链脂肪酸 (VLCFA).
- 代谢和脂质学研究越来越多地揭示了更广泛的代谢影响.
研究的目的:
- 用模型生物和人类样本调查PBD-ZSD中的脂质异常.
- 为了确定脂和胺酸链长度的特定变化.
- 了解对脂质合成和重塑路径的影响.
主要方法:
- 使用了 *Drosophila* 模型 (*pex2*, *pex16*) 和来自 *PEX1* 突变个体的人类血.
- 在幼虫和大脑中分析了脂和二甲基甘油 (DAG) 乙烯链长度.
- 在人体血中检查了基烯酸链长度.
主要成果:
- 在 *Drosophila* 模型中确定了酸丁 (PC) 和酸丁乙醇胺 (PE) 酸链长度的变化.
- 观察到DAG中中间链的长度增加,这表明肯尼迪通路失衡.
- 在人体血中发现了类似的脂变化,其中减少了C18和C22基胺.
结论:
- 过氧体生物发生缺陷会破坏跨多个脂类的乙烯链穿.
- 建议在PC和PE的*de novo*合成 (肯尼迪通路) 和重塑 (兰兹循环) 之间存在失衡.
- 广泛的细胞膜脂质异常有助于多系统PBD-ZSD表型,特别影响神经系统功能.
相关概念视频
Protein Import into the Peroxisomes
3.5K
Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
3.5K
Asymmetric Lipid Bilayer
7.2K
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
7.2K
Membrane Asymmetry Regulating Transporters
4.5K
Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
4.5K
Phosphoinositides and PIPs
8.5K
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...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
8.5K


