Video Experimental Relacionado
Updated: May 3, 2026
10:00
Use of Enzymatic Biosensors to Quantify Endogenous ATP or H2O2 in the Kidney
Published on: October 12, 2015
11.1K
Las catecolaminas regulan la actividad, secreción y síntesis de la renalasa
Guoyong Li1, Jianchao Xu, Peili Wang
1Department of Medicine, Yale School of Medicine, New Haven, CT 06520-8029, USA.
Circulation
|February 27, 2008
Resumen
La renalasa endógena, una enzima inactiva, se activa durante las oleadas de catecolaminas, degradando el exceso de catecolaminas. Este descubrimiento ofrece un nuevo objetivo terapéutico para enfermedades como la enfermedad renal crónica.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Fisiología Fisiología Fisiología.
- Nefrología Nefrología.
Sus antecedentes:
- La renalasa es una nueva amina oxidasa secretada que metaboliza las catecolaminas circulantes.
- La administración parenteral de renalasa reduce la presión arterial, la frecuencia cardíaca y la contractilidad cardíaca.
- Se observan niveles plasmáticos reducidos de renalasa en pacientes con enfermedad renal crónica, pero se desconoce su papel endógeno.
Objetivo del estudio:
- Investigar el papel endógeno de la renalasa en la regulación de las catecolaminas.
- Comprender el mecanismo de activación de la renalasa bajo condiciones fisiológicas.
Principales métodos:
- Se evaluó la actividad de la renalasa amina oxidasa en respuesta a las oleadas de epinefrina in vivo e in vitro.
- Cambios hemodinámicos medidos en ratas después de la administración de epinefrina.
- Investigó la expresión del gen renalasa en células cultivadas expuestas a la dopamina.
- Se examinó la activación de la prorenalasa en ratas con enfermedad renal crónica.
Principales resultados:
- La renalasa circulante (prorenalasa) está inactiva básicamente, pero se activa rápidamente tras el aumento de la epinefrina.
- La activación aumenta significativamente la actividad renalasa en cuestión de segundos, sostenida durante más de una hora.
- El aumento de la epinefrina aumenta la concentración plasmática de renalasa y regula la expresión génica de la renalasa.
- La activación de la prorenalasa es anormal en ratas con enfermedad renal crónica.
Conclusiones:
- Identifica un nuevo mecanismo regulador de las catecolaminas: el exceso de catecolaminas activa la prorenalasa, un precursor inactivo, en la renalasa activa.
- Las oleadas de catecolaminas no solo activan sino que también promueven la secreción y síntesis de renalasa.
- La terapia de reemplazo de renalasa es una estrategia terapéutica prometedora para la enfermedad renal crónica debido a su papel en el metabolismo de las catecolaminas.
Videos de Conceptos Relacionados
01:33Hormonal Regulation
30.4K
The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
30.4K
01:27Adrenergic Neurons: Neurotransmission
5.4K
Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
Synthesis: Catecholamine synthesis requires tyrosine, which...
Synthesis: Catecholamine synthesis requires tyrosine, which...
5.4K
01:30Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors
2.7K
Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
2.7K
01:25Antihypertensive Drugs: Direct Renin Inhibitors
1.9K
The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...
1.9K
01:17Hormonal Regulation of Blood Pressure
7.8K
Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction...
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction...
7.8K
01:13Introduction to Urinary System
11.2K
The urinary system consists of two kidneys, two ureters, the urinary bladder, and the urethra.
The kidneys are bean-shaped organs located in the retroperitoneal space, on either side of the vertebral column, between the T12 and L3 vertebrae. They are partially protected by the rib cage and surrounded by perirenal fat, which provides cushioning. They are responsible for urine formation and play critical roles in regulating blood pressure, electrolyte levels, and hormone production. The ureters...
The kidneys are bean-shaped organs located in the retroperitoneal space, on either side of the vertebral column, between the T12 and L3 vertebrae. They are partially protected by the rib cage and surrounded by perirenal fat, which provides cushioning. They are responsible for urine formation and play critical roles in regulating blood pressure, electrolyte levels, and hormone production. The ureters...
11.2K