Early life stress sensitizes the renal and systemic sympathetic system in rats

Analia S. Loria, Michael W. Brands, David M. Pollock, Jennifer S. Pollock

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We hypothesized that maternal separation (MS), an early life stress model, induces a sensitization of the sympathetic system. To test this hypothesis, we evaluated the renal and systemic sympathetic system in 12 to 14-wk old male control or MS rats with the following parameters: 1) effect of renal denervation on conscious renal filtration capacity, 2) norepinephrine (NE) content in key organs involved in blood pressure control, and 3) acute systemic pressor responses to adrenergic stimulation or ganglion blockade. MS was performed by separating pups from their mothers for 3 h/day from day 2 to 14; controls were nonhandled littermates. Glomerular filtration rate (GFR) was examined in renal denervated (DnX; within 2 wk) or sham rats using I125-iothalamate plasma clearance. MS-DnX rats showed significantly increased GFR compared with MS-SHAM rats (3.8 ± 0.4 vs. 2.4 ± 0.2 ml/min, respectively, P < 0.05), whereas DnX had no effect in controls, indicating that renal nerves regulate GFR in MS rats. NE content was significantly increased in organ tissues from MS rats (P <0.05, n 6-8), suggesting a sensitization of the renal and systemic sympathetic system. Conscious MS rats displayed a significantly greater increase in mean arterial pressure (MAP) in response to NE (2 μg/kg ip) and a greater reduction in MAP in response to mecamylamine (2 mg/kg ip, P < 0.05, n 4) monitored by telemetry, indicating that MS rats exhibit exaggerated responses to sympathetic stimulation. In conclusion, these data indicate that MS sensitizes the renal and systemic sympathetic system ultimately impairing blood pressure regulation.

Original languageEnglish (US)
Pages (from-to)F390-F395
JournalAmerican Journal of Physiology - Renal Physiology
Volume305
Issue number3
DOIs
StatePublished - Aug 1 2013

Fingerprint

Psychological Stress
Mothers
Kidney
Glomerular Filtration Rate
Norepinephrine
Arterial Pressure
Iothalamic Acid
Blood Pressure
Mecamylamine
Telemetry
Denervation
Ganglia
Adrenergic Agents

Keywords

  • Denervation
  • Early life stress
  • Glomerular filtration rate
  • Maternal separation

ASJC Scopus subject areas

  • Physiology
  • Urology

Cite this

Early life stress sensitizes the renal and systemic sympathetic system in rats. / Loria, Analia S.; Brands, Michael W.; Pollock, David M.; Pollock, Jennifer S.

In: American Journal of Physiology - Renal Physiology, Vol. 305, No. 3, 01.08.2013, p. F390-F395.

Research output: Contribution to journalArticle

Loria, Analia S. ; Brands, Michael W. ; Pollock, David M. ; Pollock, Jennifer S. / Early life stress sensitizes the renal and systemic sympathetic system in rats. In: American Journal of Physiology - Renal Physiology. 2013 ; Vol. 305, No. 3. pp. F390-F395.
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