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Reassessing the Host Defense Peptide Landscape.

Evan F Haney1, Suzana K Straus2, Robert E W Hancock1

  • 1Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, BC, Canada.

Frontiers in Chemistry
|February 20, 2019
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Summary

Small cationic peptides, known as host defense peptides (HDPs), show promise beyond antimicrobial action, acting as immune modulators and anti-inflammatories. Research explores their diverse functions and therapeutic potential in infectious diseases and inflammation.

Keywords:
antibiofilm peptideantimicrobial peptidechemical spacehost defense peptidepeptide therapeutics

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Area of Science:

  • Biochemistry and Molecular Biology
  • Immunology
  • Pharmacology

Background:

  • Small cationic amphipathic peptides are increasingly recognized for roles beyond antimicrobial activity.
  • These molecules, traditionally termed antimicrobial peptides (AMPs), are now broadly classified as host defense peptides (HDPs) due to their multifaceted functions.
  • HDPs are vital mediators in biological processes, with activities dictated by their specific amino acid sequences.

Purpose of the Study:

  • To critically review the roles of AMPs and HDPs in infectious diseases and inflammation.
  • To explore the concept of chemical space in relation to HDP function.
  • To outline emerging HDP functions and their therapeutic potential.

Main Methods:

  • Literature review and critical analysis of existing research on AMPs and HDPs.
  • Exploration of the chemical space concept applied to HDPs.
  • Synthesis of current understanding and future directions for HDP research.

Main Results:

  • HDPs exhibit diverse biological activities including antimicrobial, antibiofilm, immune modulation, and anti-inflammatory effects.
  • The functions of HDPs are sequence-dependent and can be conceptualized within independent but overlapping activity landscapes in chemical space.
  • Several emerging functions of HDPs have been identified.

Conclusions:

  • HDPs are versatile molecules with significant therapeutic promise for infectious diseases and inflammatory conditions.
  • Understanding the relationship between HDP structure, chemical space, and function is key to unlocking their full therapeutic potential.
  • Further research into emerging HDP roles can lead to novel therapeutic strategies.