Videos de Experimentos Relacionados
Deterioro del control respiratorio y de la temperatura corporal tras la inhibición aguda de las neuronas
Russell S Ray1, Andrea E Corcoran, Rachael D Brust
1Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.
Science (New York, N.Y.)
|July 30, 2011
Resumen
Este estudio revela que las neuronas serotoninérgicas del cerebro son cruciales para mantener la homeostasis fisiológica, regulando las funciones vitales como la respiración y la temperatura corporal. Se utilizó una herramienta novedosa, el ratón RC::FPDi, para silenciar estas neuronas, lo que demuestra su papel esencial.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Fisiología Fisiología Fisiología.
- Genética La genética.
Sus antecedentes:
- La homeostasis fisiológica es crítica para la supervivencia, ya que depende de complejas redes neuronales.
- La identificación de tipos específicos de neuronas involucradas en la homeostasis es un desafío continuo.
Objetivo del estudio:
- Para investigar el papel de las neuronas serotoninérgicas del cerebro en el mantenimiento de la homeostasis fisiológica.
- Para demostrar la utilidad de una nueva herramienta de silenciamiento neuronal, el ratón RC::FPDi, para el estudio de la función neuronal.
Principales métodos:
- Se utilizó el ratón RC::FPDi, un sistema basado en un receptor (Di) acoplado a proteínas G sintético para el silenciamiento neuronal inducible y reversible.
- Se administra clozapina-N-óxido (CNO) sistémicamente para activar Di en las neuronas serotoninérgicas.
- Evaluación de las respuestas quimiorreflexas al dióxido de carbono (CO2) y la acidosis.
- Regulación de la temperatura central del cuerpo controlada.
Principales resultados:
- La administración sistémica de CNO atenuó el quimiorreflejo, reduciendo los aumentos respiratorios en respuesta a la elevación de CO2 y la acidosis.
- El análisis celular mostró que la CNO suprimida aumenta la velocidad de disparo en las neuronas serotoninérgicas durante la acidosis.
- Se observó una alteración de la termorregulación, con una caída en picado de la temperatura corporal central después de la inyección de CNO.
Conclusiones:
- Las neuronas serotoninérgicas juegan un papel importante en la regulación de las redes respiratorias y termorreguladoras esenciales para mantener la vida.
- El sistema RC::FPDi del ratón proporciona un método no invasivo para mapear la función neuronal in vivo.
- Esta investigación hace avanzar nuestra comprensión de los mecanismos de control homeostático y la función del circuito neuronal.
Videos de Conceptos Relacionados
01:25Increased Body Temperature
A body temperature above 38°C (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in response to an infection or illness.
01:21Drugs Affecting Neurotransmitter Release or Uptake
Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
01:29Decreased Body Temperature
A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by sustained extreme cold exposure, and severe...
01:29Drugs Affecting Neurotransmitter Synthesis
Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
01:18Disorders of the Autonomic Nervous System
The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
Raynaud's disease, also known as Raynaud's phenomenon, is a...
Raynaud's disease, also known as Raynaud's phenomenon, is a...
01:19Homeostatic Imbalances in Body Temperature
Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...