title: Identification of Novel Metabolic Proteins Released by Insulin Signaling of the Rat Hypothalmus Using Liquid Chromatography-Mass Spectrometry (LC-MS).
abstract: OBJECTIVE
  The brain is dependent on glucose as an energy source. Intricate homeostatic mechanisms have been implicated in maintaining the blood glucose concentration in the brain. The aim of this study is to find the way to identify the metabolic proteins regulating the glucose in rat hypothalamus.
  
  
  METHODS
  In this study, we analysed the secretome from rat hypothalamus in vivo. We introduced 500 nM of insulin into the rat hypothalamus. The chromatographic patterns of the secretome were identified, after which Mass Spectrometry-Mass Spectrometry (MS-MS) analysis was performed.
  
  
  RESULTS
  In Liquid Chromatography-Mass Spectrometry (LC-MS) analysis, 60 proteins were identified in the secretome. Among them, 8 novel proteins were unveiled and were associated with the energy metabolism of insulin signaling in mitochondria of rat hypothalamic neuron. Nineteen other proteins have unknown functions. These ligands were confirmed to be secreting from the rat hypothalmus on insulin signaling by western blotting.
  
  
  CONCLUSIONS
  The hypothalamus is the master endocrine gland responsible for the regulation of various physiological and metabolic processes. Proteomics using LC-MS analysis offer a efficient means for generating a comprehensive analysis of hypothalamic protein expression by insulin signaling.
authors.affiliation: Department of Neurological Surgery, Ulsan University Hospital, Ulsan, Korea.
authors.forename: Chur
authors.initials: C
authors.lastname: Chin