概括
这项研究追踪了KB细胞中的表皮生长因子 (EGF) 和差异转移蛋白 (TF),揭示了不同的途径. 与TF不同,EGF使用Golgi相关的涂层膜进行 lysosomal 转移.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 受体介导的内分细胞分裂对细胞吸收诸如表皮生长因子 (EGF) 和基转移素 (TF) 等配体至关重要.
- 克拉特林涂层的膜在内细胞分裂的初始阶段起着关键作用.
- 了解不同配体的独特细胞内贩运途径对于细胞功能至关重要.
研究的目的:
- 研究KB细胞中EGF和TF与克拉斯林涂层膜的结合动力学.
- 为了阐明EGF和TF在受体介导内细胞突变后的独特细胞内贩运路径.
- 提供生物化学和形态学证据,证明戈尔吉相关的涂层膜在EGF运输中的参与.
主要方法:
- 使用与金黄色葡萄球菌结合的抗克拉林抗体进行膜分量的免疫吸附.
- 在4°C时将KB细胞与EGF和TF化,然后将其加热到30°C以研究连接体-膜关联.
- 使用EGF-马过氧化酶 (EGF-HRP) 和TF-HRP进行平行形态实验,使用电子显微镜.
主要成果:
- 在内部化后,EGF和TF都最初与克拉特林涂层膜相关.
- 15分钟后,两种连接体都转移到一个与非克拉斯林相关的隔间.
- 随后,EGF,但不是TF,在第二个与克拉特林相关的区块和Golgi相关的涂层坑中被发现,这表明 lysosomes 的途径是不同的.
结论:
- 戈尔吉地区的涂层膜参与了EGF转移到 lysosomes.
- 在初始内细胞化后,EGF和TF遵循不同的细胞内贩运途径.
- 描述的免疫吸附方法对于研究受体介导内细胞突变动力学是有价值的.
相关概念视频
Cell Migration
Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
Mechanism of Lamellipodia Formation
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
Cell Motility through Blebbing
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
Elastin is Responsible for Tissue Elasticity
Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
Ligaments and tendons are made of dense regular connective tissue, but in ligaments not all fibers are parallel. Dense regular elastic tissue contains elastin fibers and...
Ligaments and tendons are made of dense regular connective tissue, but in ligaments not all fibers are parallel. Dense regular elastic tissue contains elastin fibers and...
Cell-matrix's Response to Mechanical Forces
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
Renewal of Skin Epidermal Stem Cells
The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular cells,...


