Background The binding lectin mannose (MBL) is a serum protein of collectin family that appears to be involved in the inflammatory process and in the genesis of atherosclerotic disease.
Objectives To study the association of serum levels of MBL and its genotypic variation with carotid arteries intimal thickness (IMT) in rheumatoid arthritis (RA) patients from Southern Brazil.
Methods Serum level, MBL genotyping and IMT were studied in 90 RA patients along with their demographic, clinical and laboratory profile. MBL levels were measured in 90 healthy controls.
Results There was significant difference between mean serum levels of MBL in patients with RA and controls (528 ng/mL vs 937.5 ng/mL, p=0.05, respectively). The median IMT in RA patients was 0.59 mm (0.51 to 0.85 mm). There was no correlation between levels of MBL with disease activity measured by DAS-28 (disease activity score-28), erythrocyte sedimentation rate (ESR), autoantibodies presence or IMT (p=NS). A negative correlation was found between MBL levels with CRP levels (p=0.02). The mutation vat codon 54 (variant B) and HYPA haplotype were the most frequent (67.5% and 31.7%, respectively) in the RA sample. Dominant genotypes (A/A) are associated with lower IMT when compared with heterozygotes (A/O; p=0.04) and homozygous recessive (O/O; p=0.05). Also dominant genotypes had lower CRP when compared with heterozygous (p=0.04) or with recessive genotypes (p=0.05).
Conclusions RA patients had lower MBL levels than controls. MBL serum levels are negatively associated with CRP; low producers of MBL had increased thickness of the IMT than high producers.
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Disclosure of Interest None declared