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Osteoprotegerin is not a determinant of metabolic syndrome in sub-Saharan Africans after age adjustment - 07/08/14

Doi : 10.1016/j.ando.2014.05.006 
Clarisse Noël Ayina Ayina a, Philippe Boudou b, h, Ibrahim Fidaa b, Eric Vounsia Balti c, Eugene Sobngwi d, e, , Laurent Serge Etoundi Ngoa f, Jean François Gautier g, h
a Department of animal science, faculty of science, university of Douala, Douala, Cameroon 
b Department of hormonal biology, Saint-Louis hospital, university Paris-Diderot Paris-7, PO Box 75010, Public assistance–Paris Hospitals, 75013 Paris, France 
c Diabetes research center, Brussels Free university-VUB, Brussels, Belgium 
d Institute of health and society, university of Newcastle upon Tyne, UK 
e Department of internal medicine, national obesity center, faculty of medicine and biomedical sciences, university of Yaounde I, P.O. Box 7535, Yaounde, Cameroon 
f Department of animal science, higher teacher's training college, university of Yaounde I, Yaounde, Cameroon 
g University center of diabetes and complications in Lariboisière hospital, university Paris-Diderot Paris-7, Public assistance–Paris Hospitals, Paris, France 
h UMR-S Inserm 872, Cordeliers research center, Pierre et Marie-Curie university Paris-6, Paris, France 

Corresponding author.

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Abstract

Objectives

Osteoprotegerin (OPG), a soluble member of tumor necrosis factor receptor superfamily that inhibits bone resorption, has been suggested as a cardiovascular risk factor in humans. In this study, we aim to investigate the potential relationship between OPG and MetS (MetS) in a sub-Saharan African population.

Methods

Four hundred and eleven volunteers (152 men, 259 women) aged ≥18years recruited from the general population in Douala and Edea, Cameroon participated in this study. Anthropometric parameters measured and blood samples were collected for glucose, serum lipids and OPG concentrations measurements. Mean differences of the variables in different groups were compared using Students’ t test. We performed logistic regressions to analyze the impact of independent factors on the relation between OPG and MetS outcome. MetS was defined using the Joint Interim Statement 2009.

Results

OPG levels did not vary significantly between both men and women with and without MetS (both P>0.05). However, with high fasting blood glucose (≥5.6mmol/L) had a significantly higher OPG level than those with lower glucose level (P=0.014). In multiple logistic regression analysis, MetS did not show any significant association with serum OPG levels in men and women after adjusting for age, physical activity, alcohol consumption and menopausal status in women (P=0.720 and P=0.930 respectively).

Conclusion

This study failed to demonstrate any relationship between OPG and MetS. Nevertheless, the positive association between blood glucose and OPG levels reveals that OPG might be involved in cardiovascular risk development in this sub-Saharan African population.

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Résumé

Objectifs

L’ostéoprotégérine (OPG) est un élément de la superfamille des récepteurs du facteur de nécrose tumorale qui inhibe la résorption osseuse. L’OPG a été suggérée comme facteur de risque cardiovasculaire chez l’homme. Dans la présente étude, nous investiguons l’association entre l’OPG et le syndrome métabolique (SM) dans une population d’Afrique sub-saharienne.

Méthodes

Cent cinquante-deux hommes et 259 femmes âgés d’au moins 18ans ont été recrutés à Douala et Edéa au Cameroun. Les paramètres anthropométriques, la glycémie et les lipides ont été mesurés. Les moyennes ont été comparées en utilisant le test t de Student. Le test de régression logistique a permis d’investiguer la relation entre l’OPG et le SM. Le SM a été défini suivant le consensus de 2009.

Résultats

Le taux d’OPG n’a pas varié significativement entre les sujets avec et sans SM aussi bien chez les hommes que chez les femmes (p>0,05). Nous avions cependant observé une différence significative entre les femmes avec hyperglycémie (>5,6mmol/L) par rapport à celles ayant une glycémie moins élevée (p=0,014). Le SM n’a été associé aux taux sériques d’OPG ni chez les hommes (p=0,720), ni chez les femmes (p=0,930) après ajustement des modèles statistiques pour l’âge, l’activité physique, la consommation d’alcool et la ménopause chez les femmes.

Conclusion

Aucune relation entre OPG et le SM n’a été démontrée. Toutefois, l’association positive entre la glycémie et le taux d’OPG révèlerait une contribution de l’OPG dans le développement de risques cardiovasculaires dans cette population d’Afrique sub-Saharienne.

Il testo completo di questo articolo è disponibile in PDF.

Keywords : Osteoprotegerin, Metabolic syndrome, Cameroon, Sub-Saharan Africa

Mots clés : Ostéoprotégérine, Syndrome métabolique, Cameroun, Afrique sub-saharienne


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© 2014  Pubblicato da Elsevier Masson SAS.
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