Related Experiment Video
Updated: Aug 9, 2026
08:38
Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses
Published on: February 22, 2019
Tick modulation of host immunity: an important factor in pathogen transmission
1Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater 74078, USA. skw8965@okstate.edu
International Journal for Parasitology
|September 10, 1999
Summary
Ticks employ immune evasion strategies, suppressing host defenses to feed and transmit diseases like Lyme disease. Understanding these mechanisms is key to developing novel control methods against tick-borne pathogens.
Area of Science:
- Immunology
- Parasitology
- Entomology
Background:
- Tick-host interactions involve complex immune responses from both the host and the tick.
- Ticks possess sophisticated mechanisms to modulate host immunity, facilitating blood-feeding and pathogen transmission.
Purpose of the Study:
- To elucidate the immunological interplay at the tick-host interface.
- To understand tick-mediated immunosuppression and its role in disease transmission.
- To propose a new strategy for controlling tick-borne pathogens.
Main Methods:
- Analysis of host immune pathways stimulated by tick feeding.
- Characterization of immunosuppressive factors in tick saliva.
- Investigation of tick countermeasures against host immune responses.
Main Results:
- Tick feeding activates various host immune cells and molecules, including antigen-presenting cells, cytokines, B-cells, T-cells, and antibodies.
- Ticks suppress host antibody production, complement activation, T-cell proliferation, and cytokine release.
- Immunosuppressive proteins in tick saliva have been identified and partially characterized.
Conclusions:
- Tick-induced immunosuppression is crucial for successful blood meal acquisition.
- This immunosuppression facilitates the transmission and establishment of tick-borne diseases, such as Lyme disease caused by Borrelia burgdorferi.
- A novel approach for tick-borne pathogen control is proposed based on these findings.
Related Concept Videos
01:20Infection
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...
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...
01:26Factors Affecting the Risk of Infection
The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin create...
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin create...
01:24Transmission of Pathogens
Pathogens spread from their reservoirs to susceptible hosts through three main routes: contact transmission, vehicle transmission, and vector transmission. Each route involves distinct mechanisms of transfer.Contact TransmissionThis category includes direct contact, indirect contact, and droplet transmission:Direct contact involves immediate physical interaction between individuals—such as a handshake—which can spread pathogens like Streptococcus pyogenes, the bacterium responsible for...
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...
01:28Regulation of Bacterial Virulence
Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
01:29Malaria
Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...