Video Experimental Relacionado
Updated: Jun 19, 2026
11:56
In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells
Published on: September 28, 2017
El silenciamiento eléctrico diario en el reloj circadiano de los mamíferos
Mino D C Belle1, Casey O Diekman, Daniel B Forger
1Faculty of Life Sciences, A. V. Hill Building, University of Manchester, Manchester M13 9PT, UK.
Science (New York, N.Y.)
|October 10, 2009
Resumen
Las neuronas que controlan los ritmos diarios en el cerebro exhiben nuevos comportamientos eléctricos. Específicamente, las células que expresan el gen del período 1 (per1) permanecen eléctricamente excitadas pero silenciosas durante el día, desafiando los modelos anteriores de mantenimiento del tiempo.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Cronobiología cronobiología.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Los núcleos supraquiasmáticos (SCN) regulan los ritmos biológicos diarios.
- Se cree que las neuronas SCN codifican la hora del día a través de la frecuencia de disparo.
- Algunas neuronas del SCN expresan el período del gen del reloj 1 (per1).
Objetivo del estudio:
- Investigar las propiedades electrofisiológicas de las neuronas que expresan per1 en el SCN.
- Para entender cómo estas neuronas contribuyen a la codificación de la hora del día.
Principales métodos:
- Combinación de enfoques experimentales y teóricos.
- Grabaciones electrofisiológicas de las neuronas del SCN.
- Análisis de las corrientes iónicas y el comportamiento celular.
Principales resultados:
- Las neuronas que expresan per1 permanecen en un estado despolarizado y no encendido durante el día.
- Las neuronas no per1 exhiben variaciones diarias en la actividad de disparo como se informó anteriormente.
- Las corrientes iónicas explican la electrofisiología única de cada célula.
Conclusiones:
- Las neuronas Per1 muestran un comportamiento eléctrico distinto en comparación con otras neuronas SCN.
- Este estado inusual permite que las células per1 sobrevivan y funcionen mientras están despolarizadas.
- Los hallazgos desafían el modelo predominante de mantenimiento del tiempo de SCN basado únicamente en la frecuencia de disparo.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:19Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
02:19Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
02:45Biological Clocks and Seasonal Responses
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
01:02The Pineal Gland
The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...
01:15Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response
Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
01:52Eukaryotic Transcription Inhibitors
Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...