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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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Complementation Tests00:49

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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Protein Complex Assembly02:41

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Complex Power01:14

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Power engineers have introduced the concept of complex power to determine the cumulative effect of parallel loads. This idea plays a crucial role in power analysis because it encompasses all the details related to the power consumed by a specific load.
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Updated: Jan 25, 2026

Dissecting Multi-protein Signaling Complexes by Bimolecular Complementation Affinity Purification BiCAP
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The complex functioning of the complement system in xenotransplantation.

Hongmin Zhou1,2, Hidetaka Hara2, David K C Cooper2

  • 1Department of Cardiothoracic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.

Xenotransplantation
|April 30, 2019
PubMed
Summary
This summary is machine-generated.

Complement activation significantly impacts xenotransplantation outcomes, affecting organ viability from harvest to recipient immune responses. Strategies to mitigate complement

Keywords:
adaptive immune responsecoagulationcomplementinflammationinnate immune responseischemia-reperfusion injurythromboinflammationxenotransplantation

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Area of Science:

  • Immunology
  • Transplantation Biology
  • Biochemistry

Background:

  • The complement system's role in xenotransplantation is complex and multifaceted.
  • Its interactions with innate and adaptive immunity, coagulation, and inflammation are crucial.
  • The complement system also influences metabolism and homeostasis.

Purpose of the Study:

  • To provide an updated review of the complement system's role in xenotransplantation.
  • To detail the intricate interactions between complement and other biological systems.
  • To discuss current and future strategies for mitigating complement-mediated xenograft failure.

Main Methods:

  • Review of existing literature on complement activation in xenotransplantation.
  • Analysis of the mechanisms by which complement contributes to xenograft rejection.
  • Exploration of genetic and therapeutic interventions against complement effects.

Main Results:

  • Complement activation is a primary driver of xenograft failure through multiple mechanisms.
  • Detrimental effects are observed during organ harvest, preservation (ischemia-reperfusion injury), and in the recipient.
  • Interactions with immune, coagulation, and inflammatory responses exacerbate xenograft damage.

Conclusions:

  • Understanding complement pathways and interactions is vital for successful xenotransplantation.
  • Genetic engineering and therapeutic approaches offer promising avenues for protection.
  • This review serves as a comprehensive reference for this evolving field.