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More Than Black or White: Melanization and Toll Share Regulatory Serine Proteases in Drosophila

Jan Paul Dudzic1, Mark Austin Hanson1, Igor Iatsenko1

  • 1Global Health Institute, School of Life Science, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

Cell Reports
|April 25, 2019
PubMed

Insights

Arthropod defense relies on melanization, a process involving phenoloxidases (POs) activated by serine protease (SP) cascades. This study reveals distinct roles for Hayan and Sp7 SPs in wound healing and bacterial clearance, uncovering new insights into immune responses.

Area of Science:

  • Immunology
  • Entomology
  • Biochemistry

Background:

  • The melanization response is a critical immune defense in arthropods.
  • This process is regulated by complex serine protease (SP) cascades that activate phenoloxidases (POs).

Purpose of the Study:

  • To investigate the specific roles of SPs in the melanization response.
  • To identify novel phenotypes by analyzing compound mutants in Drosophila melanogaster.
  • To elucidate the regulatory mechanisms upstream of SPs involved in immune signaling.

Main Methods:

  • Utilized compound mutants in Drosophila melanogaster to uncover concealed phenotypes.
  • Analyzed the distinct functions of SPs Hayan and Sp7 in melanization.
  • Investigated the regulation of Sp7 by SPs upstream of the Toll NF-κB pathway.

Main Results:

  • Identified Hayan as essential for wound site melanization (blackening).
  • Discovered Sp7's role in an alternative melanization pathway for Staphylococcus aureus clearance.
  • Demonstrated that Sp7 is regulated by ModSP and Grass, SPs activating Toll signaling.
  • Revealed a combined function of Hayan and Psh in propagating Toll signaling downstream of pattern recognition receptors.

Conclusions:

  • Hayan and Sp7 mediate distinct arms of the arthropod melanization response.
  • The Toll pathway and specific SPs are crucial for both wound healing and bacterial clearance.
  • This study provides a deeper understanding of the intricate SP cascades governing arthropod immunity.
Keywords:
DrosophilaToll pathwaygene duplicationimmunitymelanizationprophenoloxidaseserine protease

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