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Related Concept Videos

Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this...
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Updated: Aug 24, 2025

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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Complement-related proteins in crustacean immunity.

Bao-Rui Zhao1, Xin-Xin Wang1, Ping-Ping Liu1

  • 1Shandong Provincial Key Laboratory of Animal Cells and Developmental Biology, School of Life Sciences, And State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, 266237, China.

Developmental and Comparative Immunology
|October 20, 2022
PubMed
Summary
This summary is machine-generated.

Crustaceans lack a complement system but possess related proteins crucial for host defense. This review details these proteins, their immune functions in crustaceans, and compares their systems to mammals.

Keywords:
ComplementCrustaceanLectinPhenoloxidase

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Area of Science:

  • Immunology
  • Invertebrate Biology
  • Biochemistry

Background:

  • The complement system is a vital part of the vertebrate innate immune system, involving over 30 molecules and three activation pathways.
  • Vertebrate complement systems are well-researched, playing key roles in host defense and immune regulation.
  • Crustaceans, unlike vertebrates, do not possess a classical complement system.

Approach:

  • This review synthesizes current research on complement-related proteins found in crustaceans.
  • It examines the specific functions of these proteins within crustacean immunity.
  • A comparative analysis is performed between the crustacean pro-phenoloxidase activating system and the mammalian complement system.

Key Points:

  • Crustaceans utilize complement-related proteins for essential host defense mechanisms.
  • These proteins, while not forming a complete complement system, contribute significantly to innate immunity.
  • Functional and evolutionary comparisons highlight differences and potential convergences with vertebrate systems.

Conclusions:

  • Understanding complement-related proteins in crustaceans offers insights into invertebrate immune strategies.
  • This research enhances our knowledge of the evolution of immune systems across different taxa.
  • The findings provide a foundation for future studies on crustacean immunology and host defense.