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The myeloic related protein MRP8/14 (27E10 antigen)--usefulness as a potential marker for disease activity in
N Lügering1, R Stoll, K W Schmid
1Department of Medicine B, University of Münster, Germany.
Abstract:
MRP8, MRP14 and their heterodimer MRP8/14 (27E10 antigen) are myeloic related proteins which have been shown to have a major role in inflammatory and immunological responses. In the present study monospecific antibodies against MRPs were used to investigate immunohistochemically the distribution of these proteins in routinely processed bowel tissues from 23 patients with ulcerative colitis (UC). MRP8, MRP14 and their heterocomplex MRP8/14 were demonstrated in the majority of granulocytes and macrophages in tissues of patients with active UC. Furthermore by employing the ELISA technique we measured MRP8/14 serum levels in 62 patients with UC and the results were compared with those for healthy controls. Disease activities were determined by established clinical activity indices. Serum MRP8/14 concentrations were significantly (P < 0.0001) increased in patients with active ulcerative colitis. No enhancement of serum levels were found for MRP14 and MRP8 alone, respectively. The follow-up of individual patients with initially active disease showed a decrease of MRP8/14 serum levels in parallel with clinical improvement following the start of therapy. It is thus concluded that MRP8/14 accurately reflects the degree of disease activity in UC. Further, possible biological function of MRPs seems to be associated with the heterodimeric form (27E10 antigen) rather than with individual proteins. Our morphological results confirm the finding of enhanced MRP8/14 serum levels in patients with active UC.
Insights
Myeloid-related proteins (MRP8/14) are elevated in active ulcerative colitis (UC) patients. Their serum levels correlate with disease activity, decreasing with successful therapy, indicating diagnostic potential for UC.
Area of Science:
- Immunology
- Gastroenterology
- Biochemistry
Background:
- Myeloid-related proteins (MRPs), including MRP8 and MRP14, play significant roles in inflammatory and immunological responses.
- The heterodimer MRP8/14, also known as the 27E10 antigen, is a key complex of these proteins.
Purpose of the Study:
- To investigate the distribution of MRP8, MRP14, and their heterodimer MRP8/14 in ulcerative colitis (UC) tissues.
- To assess serum levels of MRP8/14 in UC patients and correlate them with disease activity.
- To evaluate the potential of MRP8/14 as a biomarker for UC activity.
Main Methods:
- Immunohistochemical analysis of bowel tissues from 23 UC patients using monospecific antibodies against MRPs.
- Enzyme-linked immunosorbent assay (ELISA) to measure serum MRP8/14 levels in 62 UC patients and healthy controls.
- Correlation of serum MRP8/14 levels with established clinical activity indices for UC.
Main Results:
- MRP8, MRP14, and MRP8/14 were detected in granulocytes and macrophages in active UC tissues.
- Serum MRP8/14 concentrations were significantly elevated (P < 0.0001) in active UC patients compared to controls.
- Serum levels of MRP14 and MRP8 alone were not enhanced.
- Follow-up showed decreased MRP8/14 levels correlating with clinical improvement during therapy.
Conclusions:
- The heterodimer MRP8/14 accurately reflects the degree of disease activity in ulcerative colitis.
- The biological function of MRPs in UC is likely associated with the heterodimeric form (27E10 antigen).
- Enhanced MRP8/14 serum levels in active UC patients are confirmed by morphological findings.
