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2018 ; 9
(ä): 104
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Expression of Proinflammatory Cytokines Is Upregulated in the Hypothalamic
Paraventricular Nucleus of Dahl Salt-Sensitive Hypertensive Rats
#MMPMID29520237
Jiang E
; Chapp AD
; Fan Y
; Larson RA
; Hahka T
; Huber MJ
; Yan J
; Chen QH
; Shan Z
Front Physiol
2018[]; 9
(ä): 104
PMID29520237
show ga
Accumulating evidence indicates that inflammation is implicated in hypertension.
However, the role of brain proinflammatory cytokines (PICs) in salt sensitive
hypertension remains to be determined. Thus, the objective of this study was to
test the hypothesis that high salt (HS) diet increases PICs expression in the
paraventricular nucleus (PVN) and leads to PVN neuronal activation.
Eight-week-old male Dahl salt sensitive (Dahl S) rats, and age and sex matched
normal Sprague Dawley (SD) rats were divided into two groups and fed with either
a HS (4% NaCl) or normal salt (NS, 0.4% NaCl) diet for 5 consecutive weeks. HS
diet induced hypertension and significantly increased cerebrospinal fluid (CSF)
sodium concentration ([Na(+)]) in Dahl S rats, but not in normal SD rats. In
addition, HS diet intake triggered increases in mRNA levels and
immunoreactivities of PVN PICs including TNF-?, IL-6, and IL-1?, as well as Fra1,
a chronic marker of neuronal activation, in Dahl S rats, but not in SD rats.
Next, we investigated whether this increase in the expression of PVN PICs and
Fra1 was induced by increased CSF [Na(+)]. Adult male SD rats were
intracerebroventricular (ICV) infused with 8 ?l of either hypertonic salt (4 ?mol
NaCl), mannitol (8 ?mol, as osmolarity control), or isotonic salt (0.9% NaCl as
vehicle control). Three hours following the ICV infusion, rats were euthanized
and their PVN PICs expression was measured. The results showed that central
administration of hypertonic saline in SD rats significantly increased the
expression of PICs including TNF-?, IL-6, and IL-1?, as well as neuronal
activation marker Fra1, compared to isotonic NaCl controls and osmolarity
controls. Finally, we tested whether the increase in PICs expression occurred in
neurons. Incubation of hypothalamic neurons with 10 mM NaCl in a culture medium
for 6 h elicited significant increases in TNF-?, IL-6, and Fra1 mRNA levels.
These observations, coupled with the important role of PICs in modulating
neuronal activity and stimulating vasopressin release, suggest that HS intake
induces an inflammatory state in the PVN, which, may in turn, augments
sympathetic nerve activity and vasopressin secretion, contributing to the
development of salt sensitive hypertension.