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Iwona Wojda1, Małgorzata Cytryńska2, Agnieszka Zdybicka-Barabas2

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Insect hemolymph contains immune peptides and proteins that defend against pathogens. This chapter details antimicrobial peptides (AMPs) and other immune molecules, crucial for insect survival in diverse environments.

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Area of Science:

  • Insect immunology
  • Molecular biology

Background:

  • Insect hemolymph composition varies with environmental factors and physiological needs.
  • Insect immunity relies on a diverse array of polypeptides and proteins circulating in the hemolymph.

Purpose of the Study:

  • To describe insect immune-related polypeptides and proteins found in hemolymph.
  • To classify and provide examples of antimicrobial peptides (AMPs) and other immune molecules.
  • To highlight the role of these molecules in insect immune strategies.

Main Methods:

  • Literature review and synthesis of existing knowledge on insect immune molecules.
  • Classification of immune-related molecules based on their function and structure.
  • Description of specific examples of antimicrobial peptides and proteins.

Main Results:

  • Insect hemolymph contains both permanent and occasional immune-related polypeptides.
  • Antimicrobial peptides (AMPs), including cecropins, moricins, and defensins, play a key role in insect immunity.
  • Other immune proteins such as FREPs, Dscam, Hemolin, Lipophorins, Lysozyme, IMPI, and Heat Shock Proteins contribute to immune recognition and modulation.

Conclusions:

  • Insect immune molecules, particularly AMPs and various proteins, form a sophisticated defense system.
  • This efficient immune strategy enables insects to thrive in nearly all terrestrial ecological niches.
  • Understanding these molecules provides insight into one of the animal kingdom's most effective immune strategies.