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Circulating leptin level in rheumatoid arthritis and its correlation with disease activity: a meta-analysis

Zirkulierender Leptinwert bei rheumatischer Arthritis und seine Korrelation mit der Erkrankungsaktivität: eine Metaanalyse

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Abstract

Objective

This study aimed to evaluate the relationship between the circulating serum leptin level and rheumatoid arthritis (RA) and to establish a correlation between serum leptin levels and RA activity.

Methods

We searched the PUBMED, EMBASE, and Cochrane databases. A meta-analysis was performed, comparing the serum/plasma leptin levels in patients with RA and healthy controls. Correlation coefficients between serum leptin level and either disease activity score 28 (DAS28) or C‑reactive protein (CRP) in RA patients were also examined.

Results

Thirteen studies with a total of 648 RA patients and 426 controls were included in this meta-analysis. Circulating leptin level was significantly higher in the RA group than in the control group (SMD = 1.056, 95 % CI = 0.647–1.465, p = 4.2 × 10−7). In addition, stratification by ethnicity showed a significantly elevated leptin level in the RA group in Caucasian, Turkish, and Arab populations (SMD = 0.813, 95 % CI = 0.137–1.490, p = 0.018, SMD = 0.981, 95 % CI = 0.307–1.655, p = 0.004, and SMD = 1.469, 95 % CI = 0.443–2.495, p = 0.005 respectively). A meta-analysis of correlation coefficients showed a small but significantly positive correlation between the circulating leptin level and either DAS28 (correlation coefficient = 0.275, 95 % CI = 0.076–0.452, p = 0.007) or CRP (correlation coefficient = 0.274, 95 % CI = 0.068–0.458, p = 0.010).

Conclusions

Our meta-analysis demonstrated that the circulating leptin level is significantly higher in patients with RA and that a small but significantly positive correlation exists between leptin levels and RA activity.

Zusammenfassung

Ziel

Ziel der Studie war es, den Zusammenhang zwischen zirkulierendem Serumleptinspiegel und rheumatischer Arthritis (RA) zu untersuchen und eine Korrelation zwischen Serumleptinspiegeln und der RA-Aktivität festzustellen.

Methoden

Wir durchsuchten die Datenbanken PUBMED, EMBASE und Cochrane. Eine Metaanalyse wurde durchgeführt, bei der die Serum-/Plasmaleptinspiegel bei RA-Patienten und bei gesunden Kontrollgruppen untersucht wurden. Der Korrelationskoeffizient zwischen Serumleptinspiegel und entweder der Krankheitsaktivität 28 (disease activity score; DAS28) oder C‑reaktivem Protein (CRP) bei RA-Patienten wurden ebenfalls untersucht.

Ergebnisse

Dreizehn Studien mit insgesamt 648 Patienten und 426 Kontrollpersonen wurde in die Metaanalyse einbezogen. Der zirkulierende Leptinspiegel war in der RA-Gruppe signifikant höher als in der Kontrollgruppe (SMD = 1,056, 95 % CI = 0,647–1,465, p = 4,2 × 10 7). Die Schichtung nach Ethnie zeigte einen signifikant erhöhten Leptinspiegel in der RA-Gruppe bei der hellhäutigen, türkischen und arabischen Bevölkerung (SMD = 0,813, 95 % CI = 0,137–1,490, p = 0,018, SMD = 0,981, 95 % CI = 0,307–1,655, p = 0,004 bzw. SMD = 1,469, 95 % CI = 0,443–2,495, p = 0,005). Eine Metaanalyse der Korrelationskoeffizienten zeigte eine kleine, aber signifikant positive Korrelation zwischen dem zirkulierendem Leptinspiegel und entweder DAS28 (Korrelationskoeffizient = 0,275, 95 % CI = 0,076–0,452, p = 0,007) oder CRP (Korrelationskoeffizient = 0,274, 95 % CI = 0,068–0,458, p = 0,010).

Zusammenfassung

Unsere Metaanalyse konnte darlegen, dass der zirkulierende Leptinspiegel bei Patienten mit RA signifikant höher ist und dass eine kleine aber signifikant positive Korrelation zwischen Leptinspiegeln und der RA-Aktivität besteht.

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Acknowledegment

This study was supported in part by a grant from the Korea Healthcare technology R&D Project, Ministry for Health and Welfare, Republic of Korea (HI13C2124).

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Correspondence to Y. H. Lee.

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Y. H. Lee and S.-C. Bae states that there are no conflicts of interest.

The accompanying manuscript does not include studies on humans or animals.

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U. Müller-Ladner, Bad Nauheim

U. Lange, Bad Nauheim

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Lee, Y.H., Bae, S. Circulating leptin level in rheumatoid arthritis and its correlation with disease activity: a meta-analysis. Z Rheumatol 75, 1021–1027 (2016). https://doi.org/10.1007/s00393-016-0050-1

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