Angiotensin II stimulates sympathetic neurotransmission to adipose tissue

Victoria L. King, Victoria L. English, Kalyani Bharadwaj, Lisa A. Cassis

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Angiotensin II (AngII) facilitates sympathetic neurotransmission by regulating norepinephrine (NE) synthesis, release, and uptake. These effects of AngII contribute to cardiovascular control. Previous studies in our laboratory demonstrated that chronic AngII infusion decreased body weight of rats. We hypothesized that AngII facilitates sympathetic neurotransmission to adipose tissue and may thereby decrease body weight. The effect of chronic AngII infusion on the NE uptake transporter and NE turnover was examined in metabolic (interscapular brown adipose tissue, ISBAT; epididymal fat, EF) and cardiovascular tissues (left ventricle, LV; kidney) of rats. To examine the uptake transporter saturation isotherms were performed using [3H]nisoxetine (NIS). At doses that lowered body weight, AngII significantly increased ISBAT [3H]NIS binding density. To quantify NE turnover, alpha-methyl-para-tyrosine (AMPT) was injected in saline-infused, AngII-infused, or saline-infused rats that were pair-fed to food intake of AngII-infused rats. AngII significantly increased the rate of NE decline in all tissues compared to saline. The rate of NE decline in EF was increased to a similar extent by AngII and by pair feeding. In rats administered AngII and propranolol, reductions in food and water intake and body weight were eliminated. These data support the hypothesis that AngII facilitates sympathetic neurotransmission to adipose tissue. Increased sympathetic neurotransmission to adipose tissue following AngII exposure is suggested to contribute to reductions in body weight.

Original languageEnglish
Article numbere00014
JournalPhysiological Reports
Volume1
Issue number2
DOIs
StatePublished - Jul 2013

Bibliographical note

Funding Information:
This research was supported by National Institutes of Health (NIH) Heart Lung and Blood Institute HL58927 (L. A. C.) and HL73085 (L. A. C.).

Publisher Copyright:
© 2013 The Authors.

Keywords

  • Body weight
  • Catecholamine turnover
  • Norepinephrine

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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