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Infection01:20

Infection

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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
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Urinary Tract Infection II: Pathophysiology01:25

Urinary Tract Infection II: Pathophysiology

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Cystic Fibrosis: Pathogenesis01:23

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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
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Pneumonia II: Pathophysiology01:29

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The pathophysiology of pneumonia involves the following steps:
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Stages of Infection01:26

Stages of Infection

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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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Mouse Footpad Inoculation Model to Study Viral-Induced Neuroinflammatory Responses
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Ciencia básica y patogénesis

Angela Gomez-Arboledas1, Enikö Kramár1, Shimako Kawauchi1

  • 1University of California, Irvine, Irvine, CA, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 24, 2025
PubMed
Resumen
Este resumen es generado por máquina.

El amiloide-beta humano (hAb) induce déficits de potenciación a largo plazo (LTP), pero la variante APOE4 humana (hAPOE4) rescata estos déficits y previene la pérdida sináptica. Este estudio destaca hAPOE4

Palabras clave:
NeurocienciaGenéticaEnfermedad de AlzheimerApolipoproteína E4Plasticidad sinápticaMicroglíaPérdida sináptica

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Área de la Ciencia:

  • Neurociencia
  • Genética
  • Investigación de la Enfermedad de Alzheimer

Sus antecedentes:

  • Los estudios de asociación del genoma completo (GWAS) identifican la Apolipoproteína E4 (ApoE4) como el principal factor de riesgo genético para la enfermedad de Alzheimer de inicio tardío (LOAD).
  • El desarrollo de modelos de ratón avanzados es crucial para comprender la patogénesis de LOAD y evaluar estrategias terapéuticas.
  • Se creó un nuevo modelo de ratón triple homocigoto (MAD1), que integra amiloide-beta humanizado (hAb-KIloxP), ApoE4 humanizada (hAPOE4) y MAPT humanizada (hMAPT).

Objetivo del estudio:

  • Investigar el impacto del amiloide-beta humanizado (hAb) y la Apolipoproteína E4 humanizada (hAPOE4) en la función e integridad sináptica en un nuevo modelo de ratón LOAD.
  • Evaluar los efectos protectores de hAPOE4 contra los déficits sinápticos y la poda sináptica microglial inducidos por hAb.
  • Evaluar las interacciones entre el envejecimiento, hAPOE4, hMAPT y hAb en el contexto de la patogénesis de LOAD.

Principales métodos:

  • Se envejecieron ratones (cohortes hAb-KIloxP HO;hApoE4 HO y MAD1) hasta los 4, 12, 18 y 24 meses.
  • Se registró la potenciación a largo plazo (LTP) a partir de cortes de hipocampo.
  • Se evaluó la densidad sináptica y la captación sináptica microglial mediante microscopía de superresolución.

Principales resultados:

  • Los ratones hAb-KIloxP exhibieron déficits significativos de LTP en comparación con los ratones de tipo salvaje (WT), lo que indica una plasticidad sináptica alterada.
  • La presencia de hAPOE4 rescató los déficits de LTP en los ratones hAb-KIloxP a partir de los 4 meses de edad.
  • hAPOE4 previno la pérdida presináptica inducida por hAb y redujo la poda sináptica microglial excesiva observada en los ratones hAb-KIloxP.

Conclusiones:

  • El amiloide-beta humano (hAb) induce déficits sustanciales de LTP, que son prevenidos eficazmente por la variante humana APOE4 (hAPOE4) desde una edad temprana.
  • El efecto protector de hAPOE4 se extiende a la prevención de la pérdida sináptica excesiva y la poda microglial asociada con hAb.
  • Se justifica una mayor investigación para dilucidar los mecanismos específicos por los cuales la Apolipoproteína E4 humana modula la integridad y la función sináptica en LOAD.