gp130 signaling in proopiomelanocortin neurons mediates the acute anorectic response to centrally applied ciliary neurotrophic factor.
Ciliary neurotrophic factor (CNTF) exerts anorectic effects by overcoming leptin resistance via activation of hypothalamic neurons. However, the exact site of CNTF action in the hypothalamus has not yet been identified. Using Cre-loxP-mediated recombination in vivo, we have selectively ablated the common cytokine signaling chain gp130, which is required for functional CNTF signaling, in proopiomelanocortin (POMC)-expressing neurons. POMC-specific gp130 knockout mice exhibit unaltered numbers of POMC cells and normal energy homeostasis under standard and high fat diet. Endotoxin (LPS) and stress-induced anorexia and adrenocorticotropin regulation were unaffected in these animals. Strikingly, the anorectic effect of centrally administered CNTF was abolished in POMC-specific gp130 knockout mice. Correspondingly, in these animals, CNTF failed to activate STAT3 phosphorylation in POMC neurons and to induce c-Fos expression in the paraventricular nucleus. These data reveal POMC neurons as a critical site of CNTF action in mediating its anorectic effect.
Janoschek
Ruth
R
Institute for Genetics and Center for Molecular Medicine Cologne, Department of Mouse Genetics and Metabolism, University of Cologne, D-50674 Cologne, Germany.
Plum
Leona
L
Koch
Linda
L
Münzberg
Heike
H
Diano
Sabrina
S
Shanabrough
Marya
M
Müller
Werner
W
Horvath
Tamas L
TL
Brüning
Jens C
JC
D000208:Acute Disease; D000818:Animals; D000855:Anorexia / Q000235:genetics / Q000378:metabolism*; D020934:Ciliary Neurotrophic Factor / Q000008:administration & dosage* / Q000502:physiology*; D050822:Cytokine Receptor gp130 / Q000235:genetics / Q000502:physiology*; D005260:Female; D007276:Injections, Intraventricular; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008817:Mice, Mutant Strains; D009474:Neurons / Q000502:physiology*; D011333:Pro-Opiomelanocortin / Q000096:biosynthesis / Q000502:physiology*; D051381:Rats; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology*
D020934:Ciliary Neurotrophic Factor; D050822:Cytokine Receptor gp130; D011333:Pro-Opiomelanocortin