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Complement C3 proteins in psoriasis.

F Acevedo1, H Hammar

  • 1Department of Dermatology, Karolinska Sjukhuset, Karolinska Institute, Stockholm, Sweden.

The British Journal of Dermatology
|September 1, 1989
PubMed
Summary
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Researchers identified new complement factor C3 polymorphisms in human plasma. Psoriasis patients showed significantly altered C3 component levels, suggesting a role for C3 in the disease.

Area of Science:

  • Immunology
  • Biochemistry

Background:

  • The complement system, particularly complement factor C3, plays a crucial role in immune responses.
  • Polymorphisms in complement factors can influence immune function and disease susceptibility.

Purpose of the Study:

  • To identify and characterize novel polymorphisms of complement factor C3 in human plasma.
  • To investigate the levels of different C3 components in patients with psoriasis compared to healthy individuals.

Main Methods:

  • Isotachophoresis in agarose gels followed by immunodetection using anti-human C3c and C3d antibodies.
  • Analysis of C3 components in EDTA-plasma and Mg2+-zymosan activated plasma.
  • Comparison of C3 component levels in heparin-plasma from psoriasis patients and healthy controls.

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Main Results:

  • Four native C3 bands (C3s1, C3s2, C3f1, C3f2) and at least four activated C3 components (C3b1-C3b4) were identified.
  • Total C3 components were 29% higher in psoriasis patients than controls.
  • C3b components increased by 46% in psoriasis patients.
  • Slow C3 components (C3s1, C3s2) increased by 24% and 56%, while fast C3 components (C3f1, C3f2) decreased by 29% and 37% in psoriasis patients.

Conclusions:

  • The study identified new C3 polymorphisms and demonstrated significant alterations in C3 component levels in psoriasis.
  • These findings suggest a direct involvement of complement factor C3 in the pathogenesis of psoriasis.