Video Experimental Relacionado
Updated: May 7, 2026

10:01
Radial Mobility and Cytotoxic Function of Retroviral Replicating Vector Transduced, Non-adherent Alloresponsive T Lymphocytes
Published on: February 11, 2015
7.2K
Composición lipídica y difusión lateral en las membranas plasmáticas de las líneas celulares derivadas del
Cell
|May 1, 1981
Resumen
La difusión lipídica en las membranas celulares cambia con el tipo de célula y la diferenciación. Las células de carcinoma embrionario muestran una difusión lipídica más rápida, que se ralentiza con la diferenciación inducida por el ácido retinoico, en correlación con los niveles de colesterol.
Área de la Ciencia:
- Biología celular Biología celular.
- Biofísica de las membranas Biofísica de las membranas.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La diferenciación celular implica cambios significativos en las propiedades de la membrana plasmática.
- Comprender la dinámica lipídica es crucial para caracterizar la función de la membrana en diferentes estados celulares.
Objetivo del estudio:
- Investigar las diferencias en las tasas de difusión lateral de lípidos entre las células de carcinoma embrionario y las líneas celulares endodérmicas derivadas de teratocarcinoma diferenciado.
- Examinar el efecto de la diferenciación inducida por el ácido retinoico en la difusión lipídica y el contenido de colesterol en la membrana.
Principales métodos:
- Utilizó la técnica de recuperación de fotoblanqueamiento por fluorescencia (FPR).
- Se empleó una sonda fluorescente de lípidos, C16dil, para medir la difusión lateral.
- Niveles de colesterol libre de membrana cuantificados en varias líneas celulares.
Principales resultados:
- La sonda lipídica C16dil se difundió más rápidamente en las membranas plasmáticas de las células de carcinoma embrionario en comparación con las líneas celulares endodérmicas derivadas de teratocarcinoma.
- El tratamiento con ácido retinoico indujo la diferenciación en las células de carcinoma embrionario, lo que condujo a una reducción de las constantes de difusión C16dil.
- Las células de carcinoma embrionario exhibieron aproximadamente la mitad de los niveles de colesterol libre de la membrana de las líneas endodérmicas, con un aumento del colesterol al diferenciarse.
Conclusiones:
- La diferenciación celular altera significativamente la dinámica lipídica de la membrana plasmática.
- El contenido de colesterol en la membrana está inversamente correlacionado con las tasas de difusión lateral de lípidos.
- La diferenciación inducida por el ácido retinoico en las células de carcinoma embrionario recapitula los cambios observados en las líneas celulares endodérmicas, destacando el papel del colesterol en la regulación de la fluidez de la membrana.
Más Videos Relacionados
Videos de Conceptos Relacionados
Membrane Lipids
Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Asymmetric Lipid Bilayer
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%...
Tumor Progression
Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
The Tumor Microenvironment
Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
Metastasis
Metastasis is the spread of cancer cells from the original site to distant locations in the body. Cancer cells can spread via blood vessels (hematogenous) as well as lymph vessels in the body.
Epithelial-to-Mesenchymal Transition
The epithelial-to-mesenchymal transition or EMT is a developmental process commonly observed in wound healing, embryogenesis, and cancer metastasis. EMT is induced by transforming growth factor-beta (TGF-β) or receptor tyrosine kinase (RTK) ligands, which further...
Epithelial-to-Mesenchymal Transition
The epithelial-to-mesenchymal transition or EMT is a developmental process commonly observed in wound healing, embryogenesis, and cancer metastasis. EMT is induced by transforming growth factor-beta (TGF-β) or receptor tyrosine kinase (RTK) ligands, which further...
Assembly of the Lipid Bilayer in the ER
Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...

