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Related Concept Videos

Immunological Memory01:23

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
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Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
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Related Experiment Video

Updated: Feb 17, 2026

Inoculating Anopheles gambiae Mosquitoes with Beads to Induce and Measure the Melanization Immune Response
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Experimental evolution of insect immune memory versus pathogen resistance.

Imroze Khan1,2, Arun Prakash3, Deepa Agashe4

  • 1National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK, Bellary Road, Bangalore 560065, India imroze.khan@ashoka.edu.in.

Proceedings. Biological Sciences
|December 15, 2017
PubMed
Summary

Insects can evolve resistance or immune memory against pathogens. This study shows pathogen pressure can rapidly shift insect immune strategies, favoring either general resistance or specific immune memory.

Keywords:
Bacillus thuringiensisTribolium castaneumimmune primingpathogen selectionspecific immunity

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Area of Science:

  • Insect immunology
  • Evolutionary biology
  • Pathogen resistance

Background:

  • Insects possess immune memory (priming) that enhances survival after secondary pathogen exposure.
  • Theory suggests immune priming evolves under high pathogen virulence or rare exposure, but empirical evidence is lacking.
  • Understanding the adaptive benefits of immune memory versus direct resistance is crucial.

Purpose of the Study:

  • To investigate the selective pressures shaping insect immune evolution.
  • To determine ecological conditions influencing the evolution of immune memory and resistance.
  • To explore the dynamic evolution of insect immune strategies.

Main Methods:

  • Flour beetle (Tribolium castaneum) populations were subjected to strong pathogen selection using Bacillus thuringiensis (Bt) over 11 generations.
  • Different experimental groups received varying initial exposures: heat-killed Bt followed by live Bt, high-dose live Bt only, or heat-killed Bt only.
  • Immune responses, including basal resistance and immune priming, were assessed against multiple Bt strains.

Main Results:

  • Populations primed with heat-killed then live Bt evolved robust, multi-strain basal resistance.
  • Populations exposed only to high-dose live Bt developed less effective, strain-specific immune priming.
  • Priming was ineffective in ancestor populations against high Bt doses, and control groups showed no priming evolution.
  • One population demonstrated a transition from evolved priming to basal resistance.

Conclusions:

  • Pathogens can rapidly select for divergent insect immune strategies, including generalized resistance and specific immune memory.
  • The evolution of insect immune strategies is modulated by pathogen exposure dynamics and virulence.
  • This study provides the first empirical evidence for pathogen-driven modulation of insect immune priming ability.