Is CD19 an immunological diagnostic marker for acute appendicitis?

Area of Science:

• Immunology
• Gastroenterology
• Cell Biology

Background:

• The appendix, part of gut-associated lymphoid tissue, has incompletely defined lymphocyte subsets.
• Understanding these subsets is crucial for immune function in the gastrointestinal tract.

Purpose of the Study:

• To compare lymphocyte subset function and phenotype in peripheral blood and appendix.
• To analyze differences in normal versus inflamed appendix tissues.

Main Methods:

• Flow cytometry analyzed lymphocyte phenotypes in peripheral blood and appendix tissue from 81 patients.
• Mononuclear cell proliferation was assessed using the MTT method.
• Samples were collected before and after appendectomy for comparison.

Main Results:

• Appendix tissue showed significantly higher frequencies of CD19+DR+, HLA-DR+, and CD19+ cells than peripheral blood (p<0.001).
• Post-appendectomy, peripheral blood showed decreased CD19+ and HLA-DR+CD19+ cells in acute appendicitis patients (p=0.047, p=0.03).
• CD19 and HLA-DR plus CD19 demonstrated superior diagnostic efficiency (AUC=0.76, 0.73) over T cell markers.

Conclusions:

• Significant differences exist in CD19+ and HLA-DR+ lymphocyte populations between peripheral blood and appendix tissue.
• These findings highlight distinct immune profiles in the appendix and suggest potential diagnostic markers for appendicitis.