Video Experimental Relacionado
Updated: Feb 24, 2026

08:48
A Rat Model of EcoHIV Brain Infection
Published on: January 21, 2021
3.8K
VIH y consumo de cocaína comórbidos exacerban el envejecimiento acelerado del cerebro
bioRxiv : the preprint server for biology
|February 23, 2026
Resumen
El VIH y el consumo de cocaína comórbidos aceleran el envejecimiento del cerebro, aumentando el riesgo de deterioro cognitivo. Esta brecha de edad cerebral resalta alteraciones específicas de la red y posibles objetivos de intervención.
Área de la Ciencia:
- Neurociencia
- Neuroimagen
- Investigación sobre el envejecimiento
Sus antecedentes:
- La infección por el Virus de la Inmunodeficiencia Humana (VIH) y el consumo de cocaína (CU) se asocian de forma independiente con déficits cognitivos y anomalías cerebrales.
- El impacto combinado del VIH y el CU en el envejecimiento cerebral y la función cognitiva sigue sin entenderse completamente.
Objetivo del estudio:
- Investigar la relación entre el VIH comórbido y el CU y el envejecimiento cerebral acelerado.
- Examinar cómo la brecha de edad cerebral (BAG) se relaciona con el deterioro neurocognitivo (NCI) en individuos con VIH y/o CU.
- Identificar cambios estructurales cerebrales específicos asociados con el VIH y el CU comórbidos.
Principales métodos:
- Se entrenó un modelo de edad cerebral basado en morfometría utilizando Regresión de Procesos Gaussianos en datos del Proyecto de Neuroimagen del Conectoma Humano-Envejecimiento (HCP-A).
- Se aplicó el modelo a una cohorte independiente con carga variable de VIH/CU (VIH-/CU-, un trastorno, VIH+/CU+).
- Se analizó la brecha de edad cerebral (BAG) en relación con la carga de comorbilidad y la NCI, controlando las covariables; se utilizó SHapley Additive exPlanation (SHAP) para el análisis a nivel de red.
Principales resultados:
- Se observó un efecto dosis-dependiente de la carga de comorbilidad en la BAG, con el grupo VIH+/CU+ presentando la mayor BAG.
- Un aumento de la BAG se asoció significativamente con una mayor probabilidad de NCI.
- La BAG medió parcialmente la asociación entre la carga de comorbilidad y la NCI, con un efecto más fuerte en el grupo de doble trastorno.
Conclusiones:
- El VIH y el CU comórbidos se asocian con un envejecimiento estructural cerebral acelerado.
- La brecha de edad cerebral puede servir como biomarcador de alteraciones cerebrales que vinculan el VIH/CU comórbido con el deterioro cognitivo.
- La identificación de contribuciones específicas de la red a la BAG podría informar intervenciones dirigidas a personas con VIH y CU comórbidos.
Palabras clave:
VIHcocaínaenvejecimiento cerebraldeterioro cognitivoneuroimagenbrecha de edad cerebralMás Videos Relacionados
Videos de Conceptos Relacionados
CNS Stimulants: Cocaine, Amphetamines and Cannabinoids
974
CNS stimulants, such as cocaine, amphetamines, and cannabinoids, have varying structures and mechanisms of action that lead to different therapeutic effects and side effects. Cocaine, with its molecular formula C17H21NO4, is a tropane alkaloid and a tertiary amino compound. It has two chemical forms: the hydrochloride salt and the "freebase." The former is in powder form, while the latter involves removing the hydrochloride salt to create a form that can be smoked. Cocaine exerts its...
974
Alzheimer's Disease: Overview
1.8K
Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
1.8K
Drugs Affecting Neurotransmitter Synthesis
2.3K
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,...
2.3K
Pulmonary Tuberculosis I
1.1K
Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
1.1K
CNS Depressants: Alcohol and Nicotine
1.4K
Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
1.4K
Pharmacodynamics in Geriatric Patients: Effects of Age
257
Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
257

