Ehrhart-Bornstein, M.* ; Lamounier-Zepter, V.* ; Schraven, A.* ; Langenbach, J.* ; Willenberg, H.S.* ; Barthel, A.* ; Hauner, H.* ; McCann, S.M.* ; Scherbaum, W.A.* ; Bornstein, S.R.*
    
 
    
        
Human adipocytes secrete mineralocorticoid-releasing factors.
    
    
        
    
    
        
        Proc. Natl. Acad. Sci. U.S.A. 100, 14211-14216 (2003)
    
    
		
		
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			Open Access Gold möglich sobald Verlagsversion bei der ZB eingereicht worden ist.
		
     
    
		
		
			
				Obesity has become an epidemic problem in western societies, contributing to metabolic diseases, hypertension, and cardiovascular disease. Overweight and obesity are frequently associated with increased plasma levels of aldosterone. Recent evidence suggests that human fat is a highly active endocrine tissue. Therefore, we tested the hypothesis that adipocyte secretory products directly stimulate adrenocortical aldosterone secretion. Secretory products from isolated human adipocytes strongly stimulated steroidogenesis in human adrenocortical cells (NCI-H295R) with a predominant effect on mineralocorticoid secretion. Aldosterone secretion increased 7-fold during 24 h of incubation. This stimulation was comparable to maximal stimulation of these cells with forskolin (2 x 10(-5) M). On the molecular level, there was a 10-fold increase in the expression of steroid acute regulatory peptide mRNA. This effect was independent of adipose angiotensin II as revealed by the stimulatory effect of fat cell-conditioned medium even in the presence of the angiotensin type 1 receptor antagonist, valsartan. None of the recently defined adipocytokines accounted for the effect. Mineralocorticoid-stimulating activity was heat sensitive and could be blunted by heating fat cell-conditioned medium to 99 degrees C. Centrifugal filtration based on molecular mass revealed at least two releasing factors: a heat sensitive fraction (molecular mass >50 kDa) representing 60% of total activity, and an inactive fraction (molecular mass <50 kDa). However, the recovery rate increased to 92% when combining these two fractions, indicating the interaction of at least two factors. In conclusion, human adipocytes secrete potent mineralocorticoid-releasing factors, suggesting a direct link between obesity and hypertension.
			
			
				
			
		 
		
			
				
					
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        Publikationstyp
        Artikel: Journalartikel
    
 
    
        Dokumenttyp
        Wissenschaftlicher Artikel
    
 
    
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        englisch
    
 
    
        Veröffentlichungsjahr
        2003
    
 
    
        Prepublished im Jahr 
        
    
 
    
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        0
    
 
    
    
        ISSN (print) / ISBN
        0027-8424
    
 
    
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        1091-6490
    
 
    
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	    Band: 100,  
	    Heft: 24,  
	    Seiten: 14211-14216 
	    Artikelnummer: ,  
	    Supplement: ,  
	
    
 
  
        
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            National Academy of Sciences
        
 
        
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        Peer reviewed
    
 
    
        Institut(e)
        Institute of Pancreatic Islet Research (IPI)
    
 
    
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        Erfassungsdatum
        2003-12-31