P-ANCA


P-ANCA
Perinuclear staining typical of p-ANCA

p-ANCA, or Perinuclear Anti-Neutrophil Cytoplasmic Antibodies, show a perinuclear staining pattern.

This pattern occurs because the vast majority of the antigens targeted by ANCAs are highly cationic (Positively charged) at pH 7.00. During ethanol fixation, antigens which are more cationic migrate and localize around the nucleus, attracted by its negatively charged DNA content. Antibody staining therefore results in fluorescence of the region around the nucleus.

Contents

Targets

By far the most common p-ANCA target is myeloperoxidase (MPO), a neutrophil granule protein whose primary role in normal metabolic processes is generation of oxygen radicals.

ANCA will less commonly form against alternative antigens that may also result in a p-ANCA pattern. These include lactoferrin; elastase; and cathepsin G.

When the condition is a vasculitis, the target is usually MPO.[1] However, the proportion of p-ANCA sera with anti-MPO antibodies has been reported to be as low as 12%.[2]

Medical conditions

p-ANCA is associated with several medical conditions:[3]

See also

References

  1. ^ Anthony S. Fauci; Carol A. Langford (16 March 2006). Harrison's rheumatology. McGraw-Hill Professional. pp. 159–. ISBN 9780071457439. http://books.google.com/books?id=9L2-H8lV1U0C&pg=PA159. Retrieved 1 November 2010. 
  2. ^ Yehuda Shoenfeld; M. Eric Gershwin; Pier-Luigi Meroni (2007). Autoantibodies. Elsevier. pp. 98–. ISBN 9780444527639. http://books.google.com/books?id=TfW5sUfeM5gC&pg=PA98. Retrieved 1 November 2010. 
  3. ^ Mary Lee (10 March 2009). Basic Skills in Interpreting Laboratory Data. ASHP. pp. 455–. ISBN 9781585281800. http://books.google.com/books?id=AUSIRcV_as0C&pg=PA455. Retrieved 15 November 2010. 
  4. ^ Shepherd B et al. (2005). "Inflammatory Bowel Disease: Diagnostic and Treatment Options". Hospital Physician: 11–19. 
  5. ^ [1] Walker, D. G.; Bancil, A. S.; Williams, H. R.; Bunn, C.; Orchard, T. R. (2011). "How helpful are serological markers in differentiating crohn's disease from ulcerative colitis in indian asian inflammatory bowel disease patients?". Gut 60: A222–A223. doi:10.1136/gut.2011.239301.469.  edit
  6. ^ Thomas M. Habermann; Mayo Clinic (1 November 2007). Mayo Clinic Internal Medicine Concise Textbook. CRC Press. pp. 775–. ISBN 9781420067491. http://books.google.com/books?id=YJtodBwNxokC&pg=PA775. Retrieved 15 November 2010. 

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