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Spranger, J.* ; Verma, S.* ; Göhring, I.* ; Bobbert, T.* ; Seifert, J.* ; Sindler, A.L.* ; Pfeiffer, A.* ; Hileman, S.M.* ; Tschöp, M.H. ; Banks, W.A.*

Adiponectin does not cross the blood-brain barrier but modifies cytokine expression of brain endothelial cells.

Diabetes 55, 141-147 (2006)

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Adiponectin has recently been reported to generate a negative energy balance by increasing energy expenditure. However, it is unclear whether such effects require the presence and direct action of the adiponectin protein in the central nervous system. In this study, neither radiolabeled nonglycosylated nor glycosylated globular adiponectin crossed the blood-brain barrier (BBB) in mice. In addition, adiponectin was not detectable in human cerebrospinal fluid using various established methods. Using murine cerebral microvessels, we demonstrated expression of adiponectin receptors, which are upregulated during fasting, in brain endothelium. Interestingly, treatment with adiponectin reduced secretion of the centrally active interleukin-6 from brain endothelial cells, a phenomenon that was paralleled by a similar trend of other proinflammatory cytokines. In summary, our data suggest that direct effects of endogenous adiponectin on central nervous system pathways are unlikely to exist. However, the identification of adiponectin receptors on brain endothelial cells and the finding of a modified secretion pattern of centrally active substances from BBB cells provides an alternate explanation as to how adiponectin may evoke effects on energy metabolism.

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