Key result
Right atrial distension increased plasma ACTH and Fos/CRF neurons in the parvocellular PVN, with significantly greater increases in water-deprived compared to hydrated rats (P<0.01).
Why the study?
Does right atrial distension affect Fos expression in PVN CRF neurons differently in water-deprived versus hydrated rats?
Population
Awake rats implanted with a balloon at the junction of the superior vena cava and right atrium
Comparison
Right atrial distension via balloon inflation in… vs Right atrial distension via balloon inflation in…
Design
Preclinical
Authors
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Enhances mechanistic insight into dehydration-augmented atrial reflexes via CRF; leaves open applicability to human volume regulation.
Does right atrial distension affect Fos expression in PVN CRF neurons differently in water-deprived versus hydrated rats?
p-value: p=<0.01
Right atrial mechanoreceptor stimulation increases Fos expression in parvocellular CRF neurons, an effect enhanced by water deprivation, suggesting CRF's role in cardiovascular reflex adjustments to volume loading.
Benedetti et al. (2008) studied this question. Right atrial distension in water-deprived rats vs. Right atrial distension in hydrated rats was evaluated on Plasma ACTH concentrations and number of Fos- and double-labeled Fos/CRF neurons in the parvocellular PVN (p=<0.01). Right atrial distension increased plasma ACTH and Fos/CRF neurons in the parvocellular PVN, with significantly greater increases in water-deprived compared to hydrated rats (P<0.01).
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