Video Experimental Relacionado
Updated: Jul 9, 2026
11:53
Primary Endodermal Epithelial Cell Culture from the Yolk Sac Membrane of Japanese Quail Embryos
Published on: March 10, 2016
La carboxipeptidasa E es un receptor regulado de clasificación de vías secretoras: la obliteración genética conduce a
1Section on Cellular Neurobiology, Laboratory of Developmental Neurobiology, National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
Cell
|January 10, 1997
Resumen
La carboxipeptidasa E (CPE) actúa como un receptor de clasificación crucial para las proteínas secretoras reguladas en las células endocrinas. Su ausencia en ratones mutantes causa desorden de proteína y trastornos endocrinos.
Área de la Ciencia:
- Endocrinología Molecular La Endocrinología Molecular
- Biología celular Biología celular.
- La neuroendocrinología en neuroendocrinología.
Sus antecedentes:
- La vía secretora regulada (RSP) es esencial para la liberación de hormonas en las células endocrinas y neuroendocrinas.
- La clasificación de proteínas en gránulos secretores es un paso clave en el RSP, pero los mecanismos subyacentes no se comprenden completamente.
- La identificación de receptores de clasificación específicos es fundamental para comprender la secreción celular.
Objetivo del estudio:
- Para identificar el receptor de clasificación responsable de dirigir las proteínas a los gránulos secretores a través del RSP.
- Para investigar el papel de este receptor en la clasificación y secreción de proteínas en las células endocrinas.
- Para determinar las consecuencias de la deficiencia de receptores en la función endocrina.
Principales métodos:
- Estudios de localización para identificar el receptor de clasificación en la hipófisis Golgi y las membranas granulares secretoras.
- Ensayos vinculantes para evaluar la especificidad del receptor para las proteínas RSP frente a las proteínas secretoras constitutivas.
- Análisis de la clasificación y secreción de proteínas en un modelo de ratón mutante Cpe (grasa) que carece del receptor identificado.
Principales resultados:
- La carboxipeptidasa E asociada a la membrana (CPE) fue identificada como el receptor de clasificación.
- CPE se une específicamente a las proteínas de la vía secretora regulada regulada, incluidas las prohormonas.
- En ratones mutantes en Cpe (grasa), la pro-opiomelanocortina fue mal clasificada en la vía constitutiva, lo que condujo a una secreción no regulada.
Conclusiones:
- El CPE funciona como un receptor de clasificación crítico para las proteínas secretoras reguladas en las células endocrinas.
- La pérdida de la función de CPE resulta en un deterioro de la clasificación de proteínas y una secreción no regulada.
- La deficiencia de CPE conduce a múltiples trastornos endocrinos, incluida la hiperproinsulinemia y la infertilidad, en ratones mutantes.
Videos de Conceptos Relacionados
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
01:17Role of ER in the Secretory Pathway
Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
01:27Protein Import into the Peroxisomes
Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
01:15Receptor Downregulation in MVBs
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR activation may...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR activation may...
01:09GPCRs Regulate Adenylyl Cylase Activity
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Two...
01:20Inborn Errors of Metabolism
Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...