Video Experimental Relacionado
Updated: Jan 19, 2026

09:32
Resolving Water, Proteins, and Lipids from In Vivo Confocal Raman Spectra of Stratum Corneum through a Chemometric Approach
Published on: September 26, 2019
7.6K
Estructura molecular de la fase de larga periodicidad en el estrato córneo
Journal of the American Chemical Society
|September 25, 2019
Resumen
Los modelos atómicos revelan cómo los lípidos en el estrato córneo (SC) se organizan y se mueven. El linoleato ayuda a la transición de ceramida (Cer), afectando la administración transdérmica del fármaco y los mecanismos de potenciador tópicos.
Área de la Ciencia:
- La biofísica
- Ciencias de los materiales
- Química computacional
Sus antecedentes:
- La matriz lipídica del estrato córneo (SC), en particular la fase de larga periodicidad (LPP), es crucial para la función de barrera cutánea.
- Comprender la organización y la dinámica de los lípidos SC es clave para optimizar la administración transdérmica de fármacos.
Objetivo del estudio:
- Desarrollar y validar modelos de todos los átomos del SC LPP utilizando técnicas avanzadas de simulación.
- Elucidar los mecanismos moleculares de las transiciones y translocaciones lipídicas dentro de la SC.
- Investigar la permeación del etanol mediante el modelo SC LPP.
Principales métodos:
- Simulaciones de dinámica molecular de todos los átomos de múltiples microsegundos de estructuras de dos capas, planchas y capas (sándwich).
- Simulaciones de muestreo general para calcular los coeficientes de permeabilidad.
- Comparación de perfiles de dispersión y permeabilidad obtenidos por simulación con datos experimentales (espectroscopia, RMN, piel de cadáver).
Principales resultados:
- El linoleato promueve la fusión de la ceramida (Cer) y la transición a una conformación completamente extendida.
- Los ácidos grasos libres, Cer y el colesterol exhiben escalas de tiempo de translocación distintas dentro de la matriz lipídica SC.
- Los perfiles de dispersión simulados y la permeabilidad al etanol (log P) ≈ -7,6 a -6,6 cm/s) coinciden estrechamente con los datos experimentales.
- La primera.
- Salto de la rana
- Se propuso un mecanismo para la permeación del etanol.
Conclusiones:
- Los modelos en sándwich atómicos desarrollados por el SC LPP han sido validados experimentalmente.
- Estos modelos proporcionan información molecular sin precedentes sobre la organización, la dinámica y las propiedades de barrera de los lípidos SC.
- Los hallazgos ayudarán en el diseño racional y la optimización de los sistemas de administración transdérmica de fármacos y potenciadores tópicos.
Videos de Conceptos Relacionados
Cells of the Epidermis
6.7K
The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
The cells in all these layers except the stratum basale are called keratinocytes, a type of cell that manufactures and stores the protein keratin. The keratinocytes in the stratum corneum are dead and regularly slough away, being replaced by cells from...
6.7K
Layers of the Epidermis
7.8K
The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows:
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
7.8K
Accessory Structures of the Skin: Hair and Hair Follicles
4.3K
Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...
4.3K
Papillary Dermis
5.5K
Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen...
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
Papillary Layer
The papillary layer is made of loose, areolar connective tissue, which means the collagen...
5.5K
Accessory Structures of the Skin: Hair Growth and Types
2.3K
Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...
2.3K
Metallic Solids
20.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.5K

