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Am J Physiol Endocrinol Metab 293: E1443-E1450, 2007. First published September 18, 2007; doi:10.1152/ajpendo.00273.2007
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Expression of adrenomedullin in human epicardial adipose tissue: role of coronary status

Alina Silaghi,1,2,3 Vincent Achard,1,2 Odile Paulmyer-Lacroix,1,2 Traian Scridon,4 Virginie Tassistro,1,2 Ileana Duncea,3 Karine Clément,5 Anne Dutour,1,2 and Michel Grino1,2

1INSERM U626, 2Faculté de Médecine, Aix-Marseille Université, Marseille, France; 3Department of Endocrinology, Cluj Hospital, Cluj; 4Department of Cardiac Surgery, Cluj Heart Institute, Cluj, Romania; 5INSERM U872, Paris, France

Submitted 2 May 2007 ; accepted in final form 11 September 2007

Epicardial white adipose tissue (eWAT) is in close contact with coronary vessels and therefore could alter coronary homeostasis. Adrenomedullin (AM) is a potent vasodilatator and antioxidative peptide which has been shown to play a cytoprotective role in experimental models of acute myocardial infarction. We studied, using immunohistochemistry and qRT-PCR, the expression of AM and its receptors calcitonin receptor-like receptor (CRLR), and receptor activity-modifying protein (RAMP)2 and -3 in paired biopsies of subcutaneous WAT (sWAT) and eWAT obtained from patients with coronary artery disease (CAD) or without CAD (NCAD). In eWAT obtained from NCAD or CAD patients, immunoreactivity for AM, CRLR, and RAMP2 and -3 was detected in blood vessel walls and isolated stromal cells close to adipocytes. Some of the AM positive stromal cells colocalized CD68 immunoreactivity. eWAT from CAD patients showed increased AM immunoreactivity and AM gene expression. CRLR mRNA levels were comparable in sWAT of both groups and decreased by 40–50% in eWAT, irrespectively of the coronary status. RAMP2 mRNA concentrations did not change while RAMP3 mRNA levels increased in sWAT from CAD patients. There was a positive linear relationship between eWAT 11beta-hydroxysteroid dehydrogenase type 1 mRNA (11beta-HSD-1, the enzyme that converts inactive to active glucocorticoids) and AM mRNA. In conclusion, we demonstrate that AM and its receptors are expressed in eWAT. Our data suggest that eWAT AM, which could originate from macrophages, is related to 11beta-HSD-1 expression. AM synthesis, which is increased in eWAT during chronic CAD in humans, can play a cardioprotective role.

calcitonin receptor-like receptor; receptor activity-modifying proteins; 11beta-hydroxysteroid dehydrogenase type 1; coronary artery disease


Address for reprint requests and other correspondence: M. Grino, INSERM U626, Faculté de Médecine Timone, 27 Boulevard Jean Moulin, 13385 Marseille Cedex 5, France (e-mail: michel.grino{at}gmail.com)






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