Video Experimental Relacionado
Updated: Jun 19, 2026
28:15
Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer
Published on: July 29, 2010
Identificación de un transportador intestinal de folato y la base molecular para la malabsorción hereditaria de
Andong Qiu1, Michaela Jansen, Antoinette Sakaris
1Department of Medicine, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.
Cell
|November 30, 2006
Resumen
Los científicos descubrieron un nuevo transportador de folato de alta afinidad crucial para la absorción de nutrientes en el intestino delgado. Este transportador de folato acoplado a protones (PCFT) es esencial para la homeostasis del folato y su mal funcionamiento causa malabsorción hereditaria del folato.
Área de la Ciencia:
- Bioquímica nutricional y nutrición.
- Fisiología Humana Fisiología Humana.
- Genética molecular La genética molecular.
Sus antecedentes:
- Los folatos son micronutrientes vitales para los procesos celulares, incluida la síntesis del ADN y la regulación epigenética.
- La absorción de ácido fólico se produce principalmente en el intestino delgado superior en condiciones ácidas, pero el mecanismo de transporte se mantuvo en gran medida indefinido.
- Investigaciones anteriores identificaron una proteína portadora de hemo (HCP1) con propiedades de transporte de baja afinidad e independientes del pH.
Objetivo del estudio:
- Identificar y caracterizar el mecanismo molecular de la absorción de folato en el intestino delgado superior humano.
- Investigar el papel de un transportador específico en la homeostasis del folato y la malabsorción hereditaria del folato.
Principales métodos:
- Identificación y caracterización funcional de un nuevo transportador de folato de alta afinidad y dependiente del pH en las células intestinales humanas.
- Análisis de una mutación de pérdida de función en el gen identificado en una familia afectada por malabsorción hereditaria de folato.
- Reevaluación de la proteína portadora de hemo 1 (HCP1) previamente identificada para su papel en el transporte de ácido fólico.
Principales resultados:
- Se identificó un transportador humano de folato de alta afinidad acoplado a protones (PCFT), responsable de la absorción de folato en el intestino y otros tipos de células a pH bajo.
- Una mutación de pérdida de función en el gen PCFT se confirmó como la causa de la malabsorción hereditaria de folato en una familia estudiada.
- El estudio establece que la función principal de PCFT / HCP1 es el transporte de folato acoplado a protones, esencial para la homeostasis del folato.
Conclusiones:
- El transportador de folato acoplado a protones (PCFT / HCP1) es crítico para la absorción eficiente de folato en el intestino humano.
- Los defectos en PCFT/HCP1 conducen a la malabsorción hereditaria del folato, destacando su importancia en la nutrición humana.
- Este hallazgo redefine el papel primario del producto genético PCFT/HCP1 de un portador de hemo a un transportador crucial de ácido fólico.
Videos de Conceptos Relacionados
01:19Drug Absorption Mechanism: Carrier-Mediated Membrane Transport
Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
Facilitated diffusion is a passive process that utilizes human Solute Carrier (SLC) transporters. These transporters bind to the drug, undergo structural...
Facilitated diffusion is a passive process that utilizes human Solute Carrier (SLC) transporters. These transporters bind to the drug, undergo structural...
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...
01:25Factors Influencing Drug Absorption: Disease States and Pharmacology
Multiple disease states can significantly influence the oral drug absorption process by affecting blood flow and the functionality of the gastrointestinal (GI) system. Various GI diseases, including conditions that alter GI motility, such as diarrhea, decreased acid secretions (achlorhydria), and infections, have been associated with reduced drug absorption.
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
01:29Pharmacogenomics: Identification of New Drug Targets
Advances in genomics have profoundly influenced drug discovery by increasing both the speed and accuracy of pharmaceutical development. Pharmacogenomics, which examines how genetic variation influences drug response, facilitates the identification of novel therapeutic targets and enables patient stratification for personalized treatment. These strategies contribute to improved drug efficacy, minimized adverse effects, and more efficient clinical trial design.Mapping genetic differences...
01:27Esophageal Achalasia
Esophageal achalasia is a chronic neurogenic disorder characterized by impaired relaxation of the lower esophageal sphincter (LES) and absent or ineffective peristalsis in the distal esophagus. This leads to a functional obstruction without a physical blockage, despite significant disruption of esophageal motility.EtiologyAchalasia is caused by degeneration of the myenteric (Auerbach's) plexus, specifically the loss of inhibitory ganglion cells that produce vasoactive intestinal peptide (VIP)...
01:25Inflammatory Bowel Disease III: Crohn's Disease
Crohn’s disease is a chronic, relapsing form of inflammatory bowel disease characterized by segmental, transmural inflammation that can affect any part of the gastrointestinal tract. Its pathogenesis arises from a combination of genetic susceptibility, environmental exposures, epithelial barrier dysfunction, and immune dysregulation. Together, these factors lead to an exaggerated immune response against components of the gut microbiome.Genetic and Environmental InfluencesMultiple genetic...