Related Experiment Video
Updated: Jun 27, 2026
03:22
Extraction of Saliva, Haemolymph, Salivary Glands, and Midgut from Individual Ticks (Acari: Ixodidae)
Published on: October 31, 2025
CD8+ T-cells mediate immunopathology in tick-borne encephalitis
Daniel Růzek1, Jirí Salát, Martin Palus
1Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Ceské Budejovice, Czech Republic. ruzekd@paru.cas.cz
Virology
|December 17, 2008
Summary
This study reveals that CD8(+) T-cells drive the severe inflammation in tick-borne encephalitis, a significant cause of human epidemics. Reducing these immune cells prolonged survival in infected mice, highlighting immunopathology in this disease.
Area of Science:
- Neuroimmunology
- Infectious Diseases
Background:
- Tick-borne encephalitis (TBE) causes annual epidemics in Europe and Asia.
- The mechanisms driving TBE-induced encephalitis are not fully understood.
Purpose of the Study:
- To elucidate the role of CD8(+) T-cells in the immunopathology of tick-borne encephalitis.
Main Methods:
- Comparison of survival rates in SCID (severe combined immunodeficiency) mice, CD8(-/-) mice, immunocompetent mice, and mice with adoptive CD8(+) T-cell transfer after infection.
Main Results:
- SCID and CD8(-/-) mice exhibited significantly prolonged survival compared to immunocompetent controls.
- Adoptive transfer of CD8(+) T-cells into susceptible mice accelerated disease progression.
Conclusions:
- Tick-borne encephalitis is an immunopathological disease.
- CD8(+) T-cell-mediated inflammation is a critical factor contributing to the fatal outcome of TBE.
Related Concept Videos
01:26Encephalitis ll: Pathophysiology
Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
01:19Encephalitis l: Introduction
Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
01:25Arboviral Encephalitis
Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
01:26Rocky Mountain Spotted Fever
Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
01:26Bacterial 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...