Methods and kits and related anti-neutrophil cytoplasmic antibody substance of ulcerative colitis-related

摘要

For the first time, the present invention provides isolated, substantially pure, and/or recombinantly produced pANCA associated with ulcerative colitis (UCpANCA and UCpANCA material) as well as polynucleotides encoding the UCpANCA, UCpANCA material and UCpANCA polypeptides of the present invention. Using the phage display technique, immunoglobulin gene repertoires biased for the immunoglobulin genes utilized by pANCA seropositive UC patients have been isolated, amplified, randomly re-combined to generate phagemid expression vector libraries encoding DNA homologs of the gene repertoire. Methods are provided for enriching these libraries to create libraries of VH- and VL-encoding DNA homologs having immunoreactivity of UCpANCA antigen. Also provided are methods of screening the libraries of the present invention for UCpANCA and UCpANCA material. These libraries may be encapsulated in phage particles or in cells. Methods and kits are also provided for screening for UCpANCA in a sample and isolating UCpANCA antigen.