Selective estrogen receptor alpha modulation during body weight cycling
Endokrinologie, Diabetologie, Metabolismus
Zusammenfassung der Projektergebnisse
The aim of the present project in the second funding phase was the detailed analysis of ERα (estrogen receptor alpha) as a pharmacological target for the support of body weight (BW) reduction and prevention of BW-regain. Our studies aimed on the characterization of subtype and tissue/ cell-selective activation of ERα following the concept of selective ER modulation. In particular, we wanted concentrate on the role of ERα in the regulation of energy expenditure in the hypothalamus and in white adipose tissue (WAT) lipolysis. We identified a new mechanism of ERα modulation by dietary fatty acids. We discovered an unexpected phenotype of ERαlox/lox/aP2 Cre+/- (atERαKO) mice fed HFD characterized by increased mortality likely due to fatal bacterial uterine infections driven by commensal microbes. This phenotype pointed towards a previously unknown interaction of ERα signaling and FAs in macrophages. In particular, we showed that C18:0 provided by HFD modulates E2-ERα action in macrophages resulting in the perturbation of M2-macrophage polarization required for regular neutrophil-mediated defense. These processes likely result from intracellular ERα acylation leading to inhibition of its transcriptional activity and E2-dependent regulation of target genes. We believe that this new non-pharmacological way of ERα- modulation may provide a starting point for the development of new dietary ERα-modulators during BW-cycling. The possibility of dietary FA-modifications to modulate ERα thereby preventing BW-regain after an initial BW-loss should be tested in future experiments.
Projektbezogene Publikationen (Auswahl)
- Sexual dimorphic regulation of body weight dynamics and adipose tissue lipolysis. PLoS One. 2012;7:e37794
Benz V, Bloch M, Wardat S, Bohm C, Maurer L, Mahmoodzadeh S, Wiedmer P, Spranger J, Foryst-Ludwig A, Kintscher U
(Siehe online unter https://doi.org/10.1371/journal.pone.0037794) - ANP system activity predicts variability of fat mass reduction and insulin sensitivity during weight loss. Metabolism. 2016;65:935-943
Brachs M, Wiegand S, Leupelt V, Ernert A, Kintscher U, Jumpertz von Schwarzenberg R, Decker AM, Bobbert T, Hubner N, Chen W, Krude H, Spranger J, Mai K
(Siehe online unter https://doi.org/10.1016/j.metabol.2016.03.013) - High-Fat Diet Induces Unexpected Fatal Uterine Infections in Mice with aP2-Cre-mediated Deletion of Estrogen Receptor Alpha. Sci Rep 2017
Ban Z, Maurischat P, Benz V, Brix S, Sonnenburg A, Schuler G, Klopfleisch R, Rothe M, Gustafsson JA, Foryst-Ludwig A, Kintscher U
(Siehe online unter https://doi.org/10.1038/srep43269)
