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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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Complement C6 deficiency exacerbates pathophysiology after spinal cord injury.

Diane Su1, Mitra J Hooshmand1,2,3, Manuel D Galvan1

  • 1Department of Anatomy and Neurobiology, University of California, Irvine, Irvine, CA, USA.

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The membrane attack complex (MAC) C5b-9

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Area of Science:

  • Neuroscience
  • Immunology
  • Complement System Biology

Background:

  • The membrane attack complex (MAC), formed by complement components C5b-9, is historically linked to cell lysis and secondary damage following central nervous system (CNS) insults.
  • Previous research often used non-littermate controls or mouse models with limited C5b-9 activity, potentially confounding results on spinal cord injury (SCI) pathogenesis.

Purpose of the Study:

  • To elucidate the specific role of C5b-9 in spinal cord injury (SCI) and subsequent recovery.
  • To evaluate the impact of C6 deficiency on functional and histological outcomes after SCI in a controlled rat model.

Main Methods:

  • Generated littermate PVG C6 wildtype (WT) and C6-deficient (C6-D) rats.
  • Administered moderate contusion spinal cord injury using the Infinite Horizon Impactor.
  • Compared locomotor function and histological injury in C6-deficient versus WT rats under two colony conditions: separate homozygous colonies and a heterozygous colony for littermate controls.

Main Results:

  • Separate homozygous colonies for C6 WT and C6-D rats proved insufficient for accurately assessing the effects of C6 deficiency on SCI recovery.
  • The study underscores the critical need for littermate controls in genetic studies of the complement cascade's role in SCI.

Conclusions:

  • Genetic manipulation of complement components requires rigorous control strategies, specifically utilizing littermate controls, to avoid confounding variables.
  • Accurate assessment of the membrane attack complex's role in spinal cord injury necessitates precise genetic models and appropriate control groups.