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Isolation and Analysis of Plasma Lipoproteins by Ultracentrifugation
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Hypothalamic apolipoprotein A-IV is regulated by leptin.

Ling Shen1, Patrick Tso, Stephen C Woods

  • 1Department of Pathology and Laboratory Medicine, University of Cincinnati College of Medicine, Cincinnati, OH 45237-0507, USA.

Endocrinology
|March 17, 2007
PubMed
Summary

Leptin regulates hypothalamic apolipoprotein A-IV (apo A-IV) gene expression via the STAT3 pathway, impacting satiety and food intake control. This interaction suggests a synergistic mechanism for suppressing appetite.

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Area of Science:

  • Neuroendocrinology
  • Molecular Biology
  • Metabolism

Background:

  • Apolipoprotein A-IV (apo A-IV) is a satiety factor influencing food intake and body weight.
  • Apo A-IV is found in hypothalamic regions critical for energy homeostasis, where leptin also acts.

Purpose of the Study:

  • To investigate the regulation of hypothalamic apo A-IV by leptin.
  • To elucidate the signaling pathways involved in leptin's control of apo A-IV.
  • To explore the functional interaction between leptin and apo A-IV in feeding suppression.

Main Methods:

  • Analysis of hypothalamic apo A-IV mRNA levels in leptin-deficient (ob/ob) mice and lean controls.
  • Assessment of apo A-IV gene expression following lipid infusion and leptin administration (intragastric, intraperitoneal, intracerebroventricular).
  • Immunohistochemical localization of apo A-IV in leptin-sensitive hypothalamic cells and investigation of STAT3 signaling pathway involvement using small interfering RNA (siRNA).

Main Results:

  • Leptin-deficient mice exhibited reduced hypothalamic apo A-IV mRNA levels.
  • Lipid infusion stimulated apo A-IV gene expression in lean mice but not ob/ob mice.
  • Leptin administration increased hypothalamic apo A-IV mRNA in ob/ob mice and counteracted fasting-induced reduction.
  • Apo A-IV was localized in pSTAT3-positive cells of the arcuate nucleus.
  • STAT3 knockdown attenuated leptin's stimulatory effect on apo A-IV protein expression.
  • Leptin and apo A-IV demonstrated a synergistic effect in reducing food intake.

Conclusions:

  • Hypothalamic apo A-IV expression is regulated by leptin, at least partially through the STAT3 signaling pathway.
  • Leptin and apo A-IV interact synergistically to suppress food intake, highlighting their combined role in energy homeostasis.