title: Hypothalamic neuropeptide Y (NPY) controls hepatic VLDL-triglyceride secretion in rats via the sympathetic nervous system.
abstract: Excessive secretion of triglyceride-rich very low-density lipoproteins (VLDL-TG) contributes to diabetic dyslipidemia. Earlier studies have indicated a possible role for the hypothalamus and autonomic nervous system in the regulation of VLDL-TG. In the current study, we investigated whether the autonomic nervous system and hypothalamic neuropeptide Y (NPY) release during fasting regulates hepatic VLDL-TG secretion. We report that, in fasted rats, an intact hypothalamic arcuate nucleus and hepatic sympathetic innervation are necessary to maintain VLDL-TG secretion. Furthermore, the hepatic sympathetic innervation is necessary to mediate the stimulatory effect of intracerebroventricular administration of NPY on VLDL-TG secretion. Since the intracerebroventricular administration of NPY increases VLDL-TG secretion by the liver without affecting lipolysis, its effect on lipid metabolism appears to be selective to the liver. Together, our findings indicate that the increased release of NPY during fasting stimulates the sympathetic nervous system to maintain VLDL-TG secretion at a postprandial level.
authors.affiliation: Department of Endocrinology and Metabolism, Academic Medical Center (AMC), University of Amsterdam, Amsterdam, the Netherlands. e.bruinstroop@amc.uva.nl
authors.forename: Eveline
authors.initials: E
authors.lastname: Bruinstroop
authors.forename: Lei
authors.initials: L
authors.lastname: Pei
authors.forename: Mariëtte T
authors.initials: MT
authors.lastname: Ackermans
authors.forename: Ewout
authors.initials: E
authors.lastname: Foppen
authors.forename: Anke J
authors.initials: AJ
authors.lastname: Borgers
authors.forename: Joan
authors.initials: J
authors.lastname: Kwakkel
authors.forename: Anneke
authors.initials: A
authors.lastname: Alkemade
authors.forename: Eric
authors.initials: E
authors.lastname: Fliers
authors.forename: Andries
authors.initials: A
authors.lastname: Kalsbeek
mesh_terms: D000818:Animals; D001786:Blood Glucose; D005508:Food Deprivation; D005947:Glucose / Q000378:metabolism; D007031:Hypothalamus / Q000378:metabolism*; D007328:Insulin / Q000097:blood / Q000378:metabolism; D008079:Lipoproteins, VLDL / Q000378:metabolism*; D008099:Liver / Q000294:innervation / Q000378:metabolism*; D008297:Male; D009478:Neuropeptide Y / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D013564:Sympathetic Nervous System / Q000502:physiology*; D014280:Triglycerides / Q000378:metabolism*
chemical_list: D001786:Blood Glucose; D007328:Insulin; D008079:Lipoproteins, VLDL; D009478:Neuropeptide Y; D014280:Triglycerides; C030106:very low density lipoprotein triglyceride; D005947:Glucose