Video Experimental Relacionado

Updated: May 1, 2026

Assaying Surface Expression of Chemosensory Receptors in Heterologous Cells

Assaying Surface Expression of Chemosensory Receptors in Heterologous Cells

Published on: February 24, 2011

Códigos de receptores combinatorios para olores

B Malnic¹, J Hirono, T Sato

¹Howard Hughes Medical Institute, Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA.

|March 25, 1999

Resumen

Los sistemas olfativos de los mamíferos utilizan un código combinatorio para identificar miles de olores. Diferentes combinaciones de receptores olfativos (OR) reconocen moléculas de olor específicas, lo que explica cómo la percepción del olor cambia con la concentración o la estructura.

Área de la Ciencia:

La neurociencia es la neurociencia.
Investigación de los receptores olfativos.

Sus antecedentes:

Los sistemas olfativos de los mamíferos pueden discriminar entre miles de sustancias químicas volátiles.
Los mecanismos precisos de reconocimiento de olor y codificación siguen siendo incompletamente entendidos.

Objetivo del estudio:

Identificar los receptores de olor específicos (OR) responsables de distinguir entre los olores con estructuras similares pero diferentes olores percibidos.
Aclarar los principios de codificación que subyacen a la percepción olfativa.

Principales métodos:

Utilizó imágenes de calcio para monitorear la actividad neuronal en respuesta a los olores.
Reacción en cadena de la polimerasa de transcripción inversa de una sola célula (RT-PCR) empleada para identificar receptores olfativos expresados (OR) en neuronas olfativas individuales.

Principales resultados:

Se demostró que un solo receptor de olor (OR) puede reconocer múltiples olores.
Se demostró que un solo olorante puede ser reconocido por múltiples ORs.
Se estableció que los olores distintos son reconocidos por combinaciones únicas de ORs, lo que indica un esquema de codificación combinatoria.

Conclusiones:

El sistema olfativo emplea una estrategia de codificación de receptores combinatorios para codificar la identidad del olor.
Las variaciones en la estructura o concentración del olor pueden alterar el código combinatorio, modificando así la calidad del olor percibido.

Más Videos Relacionados

Live-cell Measurement of Odorant Receptor Activation Using a Real-time cAMP Assay

Live-cell Measurement of Odorant Receptor Activation Using a Real-time cAMP Assay

Published on: October 2, 2017

Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase

Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase

Published on: April 23, 2019

Videos de Conceptos Relacionados

Olfaction

Olfaction

The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...

G-Protein Gated Ion Channels

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...

Transducer Mechanism: G Protein–Coupled Receptors

Transducer Mechanism: G Protein–Coupled Receptors

G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical,...

Olfactory Receptors: Location and Structure

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...

Physiology of Smell and Olfactory Pathway

Physiology of Smell and Olfactory Pathway

Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...

Tactile and Chemical Senses

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.