Video Experimental Relacionado
Updated: Aug 8, 2026

10:03
Inducing Meningococcal Meningitis Serogroup C in Mice via Intracisternal Delivery
Published on: November 5, 2019
La defensa del huésped contra la Neisseria meningitidis requiere una actividad bactericida dependiente del
Resumen
Los individuos que carecen del componente del complemento 8 (C8) muestran un deterioro de la defensa contra las especies de Neisseria. El complemento sérico complementa el suero.
Área de la Ciencia:
- Inmunología Inmunología.
- Microbiología Microbiología.
- El sistema de complemento es un sistema de complemento.
Sus antecedentes:
- Las infecciones graves o recurrentes por Neisseria están vinculadas a deficiencias en los componentes del complemento terminal (C5-C9).
- La secuencia de ataque terminal del complemento es crucial para la defensa del huésped contra los patógenos bacterianos.
Objetivo del estudio:
- Investigar el papel de la secuencia de ataque del complemento terminal en la defensa del huésped contra las especies de Neisseria.
- Para evaluar el impacto de la deficiencia del componente del complemento 8 (C8) en la actividad bactericida.
Principales métodos:
- Se utilizó la cepa C-11 de Neisseria meningitidis.
- Serum humano empleado genéticamente deficiente en el componente 8 del complemento (serum C8-D).
- Se comparó el suero C8-D con el suero normal en ensayos funcionales que incluyen la ingestión de leucocitos, la matanza intracelular y la actividad bactericida en fase fluida.
Principales resultados:
- El suero C8-D apoyó la ingestión mediada por leucocitos y la matanza intracelular de Neisseria meningitidis de manera similar al suero normal.
- El suero C8-D exhibió una actividad bactericida en fase fluida significativamente reducida contra Neisseria meningitidis en comparación con el suero normal.
- La reconstitución del suero C8-D con C8 restauró la capacidad bactericida normal del suero.
Conclusiones:
- La actividad bactericida dependiente del complemento sérico, particularmente involucrando el componente del complemento 8, es crítica para la defensa del huésped contra las especies invasoras de Neisseria.
- La deficiencia en los componentes del complemento terminal compromete la capacidad de eliminar las infecciones por Neisseria.
Videos de Conceptos Relacionados
Humoral Immune Responses
Overview
Antimicrobial Proteins
Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Defense Against Bacterial Pathogens
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...
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...
Complement System
The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...
Bacterial Meningitis
Bacterial meningitis is a severe infectious disease involving inflammation of the meninges, the protective membranes surrounding the brain and spinal cord. It occurs when pathogenic bacteria cross the blood–brain barrier and enter the cerebrospinal fluid. Common causative organisms include Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae type b, Listeria monocytogenes, and Escherichia coli K1. The exact route of entry varies by pathogen and host condition.Routes of Entry...
Bacterial Meningitis II: Pathophysiology
Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...

