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Eid R, Abdelsalam M, Fathy AA, Abolenein HM, Elmarghany EB, El-Hanafy AA, Hamdy N, Abd-Elmagid DS, Niazy NA, Abd-El Ghaffar DM. Bone mineral density in egyptian children with juvenile idiopathic arthritis: possible correlation to serum RANKL / osteoprotegerin (OPG) ratio and OPG gene polymorphisms. Pediatr Rheumatol Online J 2023; 21:58. [PMID: 37328895 PMCID: PMC10273548 DOI: 10.1186/s12969-023-00843-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 06/10/2023] [Indexed: 06/18/2023] Open
Abstract
BACKGROUND Children with juvenile idiopathic arthritis (JIA) are at higher risk of decreased bone mineral density (BMD) compared with healthy children due to genetic, disease and medication-related causes. This study aims to investigate the possible effects of osteoprotegerin (OPG) gene polymorphisms and serum levels of osteoprotegerin (OPG) and receptor activator of nuclear factor κB-ligand (RANKL) and RANKL/OPG ratio on BMD in children with JIA. METHODS OPG gene rs2073617, rs3134069, serum RANKL, OPG and RANKL/OPG ratio were evaluated in 60 JIA children and 100 matched healthy controls. BMD was evaluated by lumbar dual energy X-ray absorptiometry (DEXA) according to which patients were classified in 2 groups (DEXA z-score above and below - 2). Composite disease activity was measured using the Juvenile Arthritis Disease Activity Score (JADAS) 27-joints. Articular damage was scored using the juvenile arthritis damage index (JADI). RESULTS Patients aged 12.05 ± 3.2 years, included 38 females and 31% had BMD z-score below-2. Systemic-onset JIA was the most frequent phenotype (38%). Genotypes and alleles frequencies of the 2 studied polymorphisms did not differ between patients and controls (p > 0.05 for all) while serum RANKL and RANKL/OPG ratio were significantly higher in patients compared to controls (p = < 0.001 and 0.03 respectively). Patients with BMD < -2 had significantly greater frequencies of rs2073617 TT genotype and T allele (p < 0.001), higher serum RANKL, RANKL/OPG ratio (p = 0.01, 0.002), female predominance (p = 0.02), higher articular and extra-articular damage index (p = 0.008,0.009) and more frequent steroid usage (p = 0.02) compared to patients with BMD z-score >-2. Multivariate analysis showed rs2073617 TT genotype, RANKL/OPG ratio, long disease duration (above 36 months) and use of steroid to be associated with decreased BMD (p = 0.03,0.04,0.01,0.01 respectively) in JIA children. CONCLUSIONS Egyptian children with JIA have decreased BMD. rs2073617 TT genotype and T allele, RANKL/OPG ratio are possible determinants of reduced BMD in JIA. Our results underline the importance of frequent monitoring of BMD in JIA children and trying to control disease activity to preserve long term bone health.
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Affiliation(s)
- Riham Eid
- Paediatric Nephrology Unit, Faculty of Medicine, Mansoura University Children’s Hospital, Mansoura University, Mansoura, 35561 Egypt
| | - Maha Abdelsalam
- Immunology Unit, Clinical Pathology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
- Department of Immunology, Egypt Center for Research and Regenerative Medicine (ECRRM), Cairo, 11517 Egypt
| | - Aya Ahmed Fathy
- Public health and Community Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Hadil M. Abolenein
- Paediatric Endocrinology and Diabetes Unit, Faculty of Medicine, Mansoura University Children’s Hospital, Mansoura University, Mansoura, Egypt
| | - Eman Bakr Elmarghany
- Rheumatology, Rehabilitation and Physical Medicine Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Aya Ahmed El-Hanafy
- Medical Biochemistry Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Nashwa Hamdy
- Paediatric Nephrology Unit, Faculty of Medicine, Mansoura University Children’s Hospital, Mansoura University, Mansoura, 35561 Egypt
| | - Dina Salama Abd-Elmagid
- Paediatric Neurology Unit, Faculty of Medicine, Mansoura University Children’s Hospital, Mansoura University, Mansoura, Egypt
| | - Nermeen A. Niazy
- Public health and Community Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Dina M. Abd-El Ghaffar
- Rheumatology, Rehabilitation and Physical Medicine Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
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