Video Experimental Relacionado
Updated: May 29, 2026
09:11
A Human Fallopian Tube Model for Investigation of C. trachomatis Infections
Published on: August 11, 2012
Mecanismo de adherencia de C. trachomatis a las células huésped eucariotas
1Department of Biomedical and Environmental Health Sciences, University of California, Berkeley 94720.
Cell
|May 29, 1992
Resumen
La Chlamydia trachomatis utiliza un nuevo mecanismo que involucra un glucosaminoglicano de superficie (GAG) para unirse a las células huésped. Este GAG actúa como una adhesina, que une los receptores tanto en el patógeno como en el huésped para la infección.
Área de la Ciencia:
- Microbiología Microbiología.
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La clamidia trachomatis es un patógeno intracelular obligado.
- La adhesión microbiana a las células huésped es crucial para la infección.
- Los mecanismos moleculares del apego a la clamidia no se comprenden completamente.
Objetivo del estudio:
- Caracterizar el mecanismo trimolecular de la adhesión de Chlamydia trachomatis a las células huésped de mamíferos.
- Para identificar las moléculas específicas involucradas en la fijación de Chlamydia.
- Para aclarar el papel de los glicosaminoglicanos (GAG) en la infección por Chlamydia.
Principales métodos:
- Purificación de los GAG y uso de las liasas GAG.
- La inhibición de la unión mediante el uso de análogos de los receptores de sulfato de heparano.
- Análisis de la síntesis de GAG en los organismos de Chlamydia.
- Restauración del apego y la infectividad mediante el uso de sulfato de heparan exógeno.
Principales resultados:
- Un GAG similar al sulfato de heparan en la superficie de Chlamydia es esencial para la unión de la célula huésped.
- La clamidia sintetiza un GAG único similar al sulfato de heparan.
- El sulfato de heparán exógeno restauró el apego y la infectividad a los organismos tratados.
- El ligando de adhesión GAG une los receptores GAG en el huésped y la clamidia.
Conclusiones:
- La Chlamydia trachomatis utiliza un nuevo mecanismo de fijación mediado por GAG.
- Un GAG superficial actúa como una adhesina, facilitando la entrada de la célula huésped.
- Este mecanismo implica el puente de los receptores GAG en las superficies de patógenos y huéspedes.
Videos de Conceptos Relacionados
01:10Intracellular Movement of Viruses and Bacteria
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a virus that...
01:24Adherens Junctions
Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
The endothelial cells...
Adherens Junctions are Dynamic
The endothelial cells...
01:19Mechanism of Conjugation
Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
01:29Bacterial Phylum Chlamydiae
The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic of...
01:25Colonisation of Pathogens
Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
01:18Trichomoniasis
Trichomonas vaginalis is a flagellated protozoan parasite and the causative agent of trichomoniasis, one of the most prevalent non-viral sexually transmitted infections in the United States. This extracellular parasite primarily colonizes the lower genitourinary tract in women—particularly the vagina—and in men, the urethra and prostate. Its structural and functional adaptations enable its survival, motility, and pathogenicity within the host environment.Structural Features and Host EntryT.