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Open Access Research article

Adiponectin: an adipocyte-derived hormone, and its gene encoding in children with chronic kidney disease

Manal F Elshamaa1*, Samar M Sabry2, Marwa M El-Sonbaty3, Eman A Elghoroury4, Nahed Emara4, Mona Raafat4, Dina Kandil4 and Gamila Elsaaid5

Author Affiliations

1 Pediatric Department, National Research Centre, 33 El-Behous street, Dokki,PC:12311, Cairo, Egypt

2 Pediatric Department, Faculty of Medicine, Cairo University, Cairo, Egypt

3 Child Health Department, National Research Centre, Cairo, Egypt

4 Clinical & Chemical Pathology Department, National Research Centre, Cairo, Egypt

5 Medical Biochemistry Department, National Research Centre, Cairo, Egypt

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BMC Research Notes 2012, 5:174  doi:10.1186/1756-0500-5-174

Published: 3 April 2012

Abstract

Background

The prevalence of cardiovascular disease (CVD) and inflammation is high in patients with chronic kidney disease (CKD). Adiponectin (ADPN) is an adipocytokine that may have significant anti-inflammatory and anti-atherosclerotic effects. Low adiponectin levels have previously been found in patients with high risk for CVD.

Methods

On seventy eight advanced CKD (stages 4 and 5) pediatric patients undergoing maintenance hemodialysis( MHD) or conservative treatment (CT) the following parameters were studied: body mass index, left ventricular mass index(LVMI), serum adiponectin , cholesterol, HDL-cholesterol, high sensitivity C-reactive protein (hs CRP),interleukin 6(IL6) and single-nucleotide polymorphisms (SNPs) in the ADIPOQ gene at positions 45, and 276. Seventy age-and gender-matched healthy subjects served as control subjects.

Results

Markedly (P = 0.01) elevated plasma adiponectin levels were observed in CKD patients, especially CT patients, compared to control subjects. The wild type of ADIPOQ 45T > G (T) allele is the main gene for patients and controls. MHD and CT patients had significantly higher frequency of the TT genotypes of +276G > T gene (P = 0.04) compared with control subjects. A significant positive correlation was observed between plasma adiponectin and IL6 level, whereas negative correlations were found between adiponectin level, cholesterol, HDL cholesterol and hs CRP. In a stepwise backward multiple regression model only IL6 (P = 0.001) was independently associated with plasma adiponectin levels. The adiponectin gene the 276 GT+TT genotypes were associated with a higher level of adiponectin .

Conclusions

The present study demonstrated that ADPN is related to several metabolic and inflammatory CV risk factors in a manner consistent with the hypothesis that this protein might have a protective role against these factors. We observed an association between the +276G>T SNP in the adiponectin gene and CKD in children. Genetic variation of +276 gene seemed to have a positive impact on circulating adiponectin levels in CKD patients.

Keywords:
Adiponectin; Single nucleotide polymorphisms; CKD; Children; Inflammation