Neural-renal interactions in the hypertension induced by papillary necrosis: Role of dietary salt intake

R. Dawson, D. R. Wallace

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effects of high salt intake (1.0% NaCl in the drinking water) on rats made hypertensive by 2-bromoethylamine hydrobromide (BEA) treatment (200 mg/kg, i.p.) were examined. BEA-induced medullary necrosis resulted in a mild hypertension (146 ± 5 mm Hg) that was exacerbated by 4 weeks of high salt intake (163 ± 6 mm Hg). BEA-treated rats had significant salt-induced increases in urinary norepinephrine excretion and hypothalamic and brainstem norepinephrine content, that were not present in BEA-treated rats drinking tap water or control rats drinking saline. BEA treatment in combination with increased salt intake produced a decrease (p < 0.05) in renal dopamine content and adrenal norepinephrine stores relative to BEA treatment alone. BEA treatment also significantly decreased renal norepinephrine stores and dopamine binding sites irrespective of salt intake. Renal α2-adrenergic receptors and central nervous system stores of dopamine and serotonin were unaffected by BEA treatment. Renal function was well preserved as indicated by normal creatinine, glucose and protein excretion; however, significant (p < 0.05) disruption of the urinary concentrating mechanism was present. These studies suggest that BEA-induced hypertension has a neural component that is exacerbated by high salt intake. The primary defect in BEA hypertension appears to be the lack of circulating antihypertensive lipids that attenuate the ability of salt loads to simulate sympathetic nervous system activity.

Original languageEnglish
Pages (from-to)42-53
Number of pages12
JournalPharmacology
Volume40
Issue number1
StatePublished - 1 Jan 1990

Fingerprint

Necrosis
Salts
Hypertension
Kidney
Norepinephrine
Dopamine
Drinking Water
Sympathetic Nervous System
Adrenergic Receptors
Antihypertensive Agents
Drinking
Brain Stem
Creatinine
Serotonin
Central Nervous System
Binding Sites
Lipids
Glucose
Proteins

Keywords

  • 2-Bromoethylamine hydrobromide
  • Kidney
  • Norepinephrine
  • Sodium chloride
  • Sympathetic nervous system

Cite this

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title = "Neural-renal interactions in the hypertension induced by papillary necrosis: Role of dietary salt intake",
abstract = "The effects of high salt intake (1.0{\%} NaCl in the drinking water) on rats made hypertensive by 2-bromoethylamine hydrobromide (BEA) treatment (200 mg/kg, i.p.) were examined. BEA-induced medullary necrosis resulted in a mild hypertension (146 ± 5 mm Hg) that was exacerbated by 4 weeks of high salt intake (163 ± 6 mm Hg). BEA-treated rats had significant salt-induced increases in urinary norepinephrine excretion and hypothalamic and brainstem norepinephrine content, that were not present in BEA-treated rats drinking tap water or control rats drinking saline. BEA treatment in combination with increased salt intake produced a decrease (p < 0.05) in renal dopamine content and adrenal norepinephrine stores relative to BEA treatment alone. BEA treatment also significantly decreased renal norepinephrine stores and dopamine binding sites irrespective of salt intake. Renal α2-adrenergic receptors and central nervous system stores of dopamine and serotonin were unaffected by BEA treatment. Renal function was well preserved as indicated by normal creatinine, glucose and protein excretion; however, significant (p < 0.05) disruption of the urinary concentrating mechanism was present. These studies suggest that BEA-induced hypertension has a neural component that is exacerbated by high salt intake. The primary defect in BEA hypertension appears to be the lack of circulating antihypertensive lipids that attenuate the ability of salt loads to simulate sympathetic nervous system activity.",
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Neural-renal interactions in the hypertension induced by papillary necrosis : Role of dietary salt intake. / Dawson, R.; Wallace, D. R.

In: Pharmacology, Vol. 40, No. 1, 01.01.1990, p. 42-53.

Research output: Contribution to journalArticle

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AU - Wallace, D. R.

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AB - The effects of high salt intake (1.0% NaCl in the drinking water) on rats made hypertensive by 2-bromoethylamine hydrobromide (BEA) treatment (200 mg/kg, i.p.) were examined. BEA-induced medullary necrosis resulted in a mild hypertension (146 ± 5 mm Hg) that was exacerbated by 4 weeks of high salt intake (163 ± 6 mm Hg). BEA-treated rats had significant salt-induced increases in urinary norepinephrine excretion and hypothalamic and brainstem norepinephrine content, that were not present in BEA-treated rats drinking tap water or control rats drinking saline. BEA treatment in combination with increased salt intake produced a decrease (p < 0.05) in renal dopamine content and adrenal norepinephrine stores relative to BEA treatment alone. BEA treatment also significantly decreased renal norepinephrine stores and dopamine binding sites irrespective of salt intake. Renal α2-adrenergic receptors and central nervous system stores of dopamine and serotonin were unaffected by BEA treatment. Renal function was well preserved as indicated by normal creatinine, glucose and protein excretion; however, significant (p < 0.05) disruption of the urinary concentrating mechanism was present. These studies suggest that BEA-induced hypertension has a neural component that is exacerbated by high salt intake. The primary defect in BEA hypertension appears to be the lack of circulating antihypertensive lipids that attenuate the ability of salt loads to simulate sympathetic nervous system activity.

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