, vol. 33, issue 1110-1164, pp. 13-19, 2010.
Introduction: The cartilage oligomeric matrix protein (COMP) is a glycoprotein, which
occurs mainly in an articular cartilage. The amount of this protein increases under the influence of
cytokines and growth factors. As a result of various diseases that cause damage to cartilage, fragments
of matrix protein are released into synovial fluid and then into blood. The assessment of
matrix protein level in serum, for example COMP, permits the establishment of the degree of cartilage
damage in inflammatory joint diseases, and permits observation of the effectiveness of the
treatment.
Aim of the work: To assess serum COMP level, as a marker for cartilage degradation, in SLE and
OA patients and to find a correlation between serum COMP level and other markers as well as
activity of disease, disease duration and the age of the patients.
Patients and methods: Blood was collected from 40 systemic lupus erythematosus (SLE) patients
group I, [the patients were further subdivided into two subgroups, group (Ia) comprised 20 SLE
patients received 1 g IV methylprednisolone (MP) daily for three successive days, group (Ib) comprised
20 SLE patients did not receive IV methylprednisolone (MP)], and from 20 patients with
* Corresponding author.
E-mail addresses: samarfawzy1@yahoo.com (S.M. Fawzy),
hhalsherbeni@gmail.com (H.H. El Sherbeni).
1110-1164 2011 Egyptian Society for Joint Diseases and Arthritis.
Production and hosting by Elsevier B.V. All rights reserved.
Peer review under responsibility of Egyptian Society for Joint Diseases
and Arthritis.
doi:10.1016/j.ejr.2010.09.001
Production and hosting by Elsevier
The Egyptian Rheumatologist (2011) 33, 13–19
Egyptian Society for Joint Diseases and Arthritis
The Egyptian Rheumatologist
www.rheumatology.eg.net
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Author's personal copy
knee osteoarthritis (OA) group II who constituted the control group. Serum COMP level was determined
using an inhibition enzyme-linked immunosorbent assay (ELISA).
Results: The measured values of the serum COMP level in SLE patients ranged from 1.32 to 1.71 lg/
ml with a mean of 1.51 ±0.13 lg/ml in group (Ia), and ranged from 2.43 to 3.56 lg/ml with a mean of
2.86 ±0.31 lg/ml in group (Ib). While inOAgroup (II) the value of serumCOMPranged from 0.97 to
2.65 lg/ml with a mean of 1.25 ± 0.37 lg/ml.Wefound significantly elevatedCOMPlevels in theSLE
group (Ib) compared to the SLE group (Ia) patients and OA group (II) (p< 0.001). We found a statistically
significant positive correlations with the number of tender joints (correlation coefficient Pearson’s:
r = 0.45, p< 0.01), the number of swollen joints (r = 0.55, p< 0.001),SLAMvalue (r = 0.56,
p< 0.001). A significant positive correlation was found between serum COMP level and the ESR
value in the first hour (r =0.35, p< 0.001). While the serum COMP level was independent of the
patients’ age (r= 0.04, p= NS), disease duration (r =0.03, p=NS) and morning stiffness duration
(r = 0.05, p =NS). Also a Negative correlation was found between the serumCOMPlevel and
haemoglobin value (r = 0.11, p=NS). As regards theOAgroup, no correlation was found between
the serum COMP level and patients’ age (r = 0.05, p=NS) and disease duration (r = 0.24,
p= NS). There were positive correlations between serum COMP and WOMAC index score for the
lower limbs (r = 0.64, p< 0.05).
Conclusion: The serum COMP level can be an important marker of disease activity and cartilage
destruction in SLE and OA Patients, and that serum levels of COMP can be used as a parameter
for monitoring the therapy response in SLE patients undergoing an intravenous bolus steroid therapy.
2011 Egyptian Society for Joint Diseases and Arthritis. Production and hosting by Elsevier B.V.
All rights reserved.