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Related Experiment Videos

Ixodes ticks: serum species sensitivity of anticomplement activity.

C H Lawrie1, S E Randolph, P A Nuttall

  • 1NERC Institute of Virology and Environmental Microbiology, OX1 3SR, Oxford, U.K.

Experimental Parasitology
|December 22, 1999
PubMed
Summary

Ixodid ticks inhibit the alternative complement pathway to feed. Tick salivary gland extracts vary in their ability to block complement, correlating with host range and serum species sensitivity.

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Area of Science:

  • Immunology
  • Parasitology
  • Entomology

Background:

  • Ixodid ticks require prolonged feeding periods, necessitating evasion of host immune responses.
  • The complement system is a critical component of innate immunity that ticks must overcome.
  • Salivary secretions play a key role in modulating host defenses during tick feeding.

Purpose of the Study:

  • To investigate the capacity of salivary gland extracts from different Ixodes tick species to inhibit the alternative pathway of complement.
  • To determine if complement inhibition varies among Ixodes species and correlates with host specificity.

Main Methods:

  • In vitro assays were performed using salivary gland extracts from Ixodes ricinus, I. hexagonus, and I. uriae.
  • Complement inhibition was assessed against the alternative pathway using serum from various animal species.

Related Experiment Videos

  • Tick host range data was correlated with observed complement inhibition patterns.

    • Main Results:

    • Salivary gland extracts from all tested Ixodes species demonstrated inhibition of the alternative complement pathway.
    • The efficacy of complement inhibition varied significantly among Ixodes species.
    • Complement inhibition capacity correlated with the animal species used as the serum source, reflecting known tick-host associations.

    Conclusions:

    • Ixodes ticks possess mechanisms within their saliva to counteract the host's alternative complement pathway.
    • Differential inhibition of complement by various Ixodes species suggests a co-evolutionary adaptation to specific host immune systems.
    • Understanding tick complement evasion strategies can inform future research on tick-borne disease transmission and control.