Video Experimental Relacionado
Updated: May 12, 2026
10:31
A Liposome Membrane Permeability Assay for Investigating the Effects of Phosphatidylinositol Phosphate Groups on Membranotropic Action of Venom PLA2
Published on: September 26, 2025
La fosfolipasa Cε hidroliza el fosfatidilinositol 4-fosfato perinuclear para regular la hipertrofia cardíaca
Lianghui Zhang1, Sundeep Malik, Jinjiang Pang
1Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, 601 Elmwood Avenue, Rochester, NY 14642, USA.
Cell
|April 2, 2013
Resumen
La deleción condicional de la fosfolipasa Cε (PLCε) en las células cardíacas previene la hipertrofia patológica. PLCε, localizado cerca del núcleo por mAKAP, activa la señalización de la proteína quinasa nuclear D (PKD) en respuesta al estrés.
Área de la Ciencia:
- Biología Cardiovascular Biología Cardiovascular
- Biología celular molecular Biología celular molecular
- Enzimología Enzimología.
Sus antecedentes:
- La fosfolipasa Cε (PLCε) es una enzima clave involucrada en varias funciones celulares, incluida la regulación cardiovascular.
- La hipertrofia cardíaca patológica es un contribuyente significativo a la insuficiencia cardíaca.
- Comprender los mecanismos moleculares subyacentes a la hipertrofia cardíaca es crucial para desarrollar terapias dirigidas.
Objetivo del estudio:
- Para investigar el papel de la fosfolipasa Cε (PLCε) en la hipertrofia cardíaca.
- Aclarar los mecanismos moleculares por los cuales el PLCε contribuye a la señalización hipertrófica en los miocitos cardíacos.
Principales métodos:
- Eliminación condicional de PLCε en los miocitos cardíacos de ratón.
- El uso de ARN pequeño interferente (siRNA) dirigido a PLCε en los miocitos ventriculares.
- Análisis de los niveles de calcio nuclear y la activación de la proteína quinasa D (PKD).
- Estudios de inmunolocalización para determinar la localización subcelular de PLCε, mAKAP, PKCε y PKD.
- Identificación del fosfatidilinositol 4-fosfato (PI4P) como sustrato para el PLCε.
Principales resultados:
- Eliminación condicional de PLCε en los miocitos cardíacos protegidos contra la hipertrofia patológica inducida por el estrés.
- El PLCε siRNA en los miocitos ventriculares redujo la elevación del calcio nuclear dependiente de la endotelina-1 (ET-1) y la activación de la PKD.
- PLCε, PKCε y PKD se localizaron en la envoltura nuclear a través de andamios por la proteína de anclaje de la kinasa A específica del músculo (mAKAP).
- Este complejo de andamios mAKAP es esencial para la activación nuclear de PKD.
- El fosfatidilinositol 4-fosfato (PI4P) en el aparato de Golgi fue identificado como un sustrato perinuclear para PLCε. mAKAP-armazón.
Conclusiones:
- El PLCε perinuclear, organizado por mAKAP en los miocitos cardíacos, juega un papel crítico en la mediación de la señalización hipertrófica.
- El PLCε genera diacilglicerol (DAG) a partir del PI4P perinuclear en respuesta a estímulos hipertróficos.
- Esta producción localizada de DAG regula la activación de la PKD nuclear y las vías hipertróficas aguas abajo, destacando el PLCε como un objetivo terapéutico potencial para la hipertrofia cardíaca.
Más Videos Relacionados
07:26Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
Published on: October 15, 2016
10:52Radiolabeling and Quantification of Cellular Levels of Phosphoinositides by High Performance Liquid Chromatography-coupled Flow Scintillation
Published on: January 6, 2016
Videos de Conceptos Relacionados
01:42Phosphoinositides and PIPs
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
01:11IP3/DAG Signaling Pathway
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
01:27Transducer Mechanism: Enzyme-Linked Receptors
Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Major types that are helpful drug targets include:
01:22Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
01:25cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
01:15Amplifying Signals via Second Messengers
Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...