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2015 ; 3
(5
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Angiotensin II is required to induce exaggerated salt sensitivity in Dahl rats
exposed to maternal separation
#MMPMID25999404
Loria AS
; Pollock DM
; Pollock JS
Physiol Rep
2015[May]; 3
(5
): ä PMID25999404
show ga
We previously reported that maternal separation, rat model of early life stress,
enhances pressor responses to acute and chronic stressors. The aims of this study
were to determine whether Dahl salt-sensitive (DS) rats subjected to maternal
separation (MatSep-DS) as compared to normally reared DS (Ctl-DS) rats show
exaggerated blood pressure responses to acute behavioral stressors, such as
restraint stress or air jet stress (AJS), or, hypertensive stimuli including
chronic high-salt diet (4% NaCl) and angiotensin II (AngII) infusion
(200 ng/Kg/min) during 1 week. MatSep was performed in male DS rats for 3 h/day
from postnatal days 2-14. At 8 weeks of age, rats were implanted with telemetry
transmitters and allowed to recover. Mean arterial pressure (MAP) was not
different between MatSep-DS and Ctl-DS rats at baseline (120 ± 2 mmHg vs.
118 ± 1 mmHg, n = 4-8). Blood pressure responses during AJS and restraint stress
were not different between MatSep-DS and Ctl-DS at 3 min. However, blood pressure
recovery from AJS was significantly impaired in MatSep-DS rats compared to Ctl-DS
rats (P < 0.05). 3-h stress-induced similar responses in MatSep and Ctl-DS rats.
Chronic blood pressure responses to AngII infusion in rats fed a high-salt diet
displayed enhanced MAP in MatSep-DS when compared with Ctl-DS rats (167 ± 5 mmHg
vs. 152 ± 2 mmHg, pinteraction <0.05). However, MAP increased similarly in both
groups in response to AngII infusion or high-salt diet separately. Renal
parameters such as proteinuria, urine flow rate, and urine electrolytes were not
different between groups in response to each treatment. In summary, salt
sensitivity induces exaggerated blood pressor responses only in presence of AngII
due to early life stress.