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2017 ; 13
(8
): 961-975
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Vasopressin Mediates the Renal Damage Induced by Limited Fructose Rehydration in
Recurrently Dehydrated Rats
#MMPMID28924378
García-Arroyo FE
; Tapia E
; Blas-Marron MG
; Gonzaga G
; Silverio O
; Cristóbal M
; Osorio H
; Arellano-Buendía AS
; Zazueta C
; Aparicio-Trejo OE
; Reyes-García JG
; Pedraza-Chaverri J
; Soto V
; Roncal-Jiménez C
; Johnson RJ
; Sánchez-Lozada LG
Int J Biol Sci
2017[]; 13
(8
): 961-975
PMID28924378
show ga
Recurrent dehydration and heat stress cause chronic kidney damage in experimental
animals. The injury is exacerbated by rehydration with fructose-containing
beverages. Fructose may amplify dehydration-induced injury by directly
stimulating vasopressin release and also by acting as a substrate for the aldose
reductase-fructokinase pathway, as both of these systems are active during
dehydration. The role of vasopressin in heat stress associated injury has not to
date been explored. Here we show that the amplification of renal damage mediated
by fructose in thermal dehydration is mediated by vasopressin. Fructose
rehydration markedly enhanced vasopressin (copeptin) levels and activation of the
aldose reductase-fructokinase pathway in the kidney. Moreover, the amplification
of the renal functional changes (decreased creatinine clearance and tubular
injury with systemic inflammation, renal oxidative stress, and mitochondrial
dysfunction) were prevented by the blockade of V1a and V2 vasopressin receptors
with conivaptan. On the other hand, there are also other operative mechanisms
when water is used as rehydration fluid that produce milder renal damage that is
not fully corrected by vasopressin blockade. Therefore, we clearly showed
evidence of the cross-talk between fructose, even at small doses, and vasopressin
that interact to amplify the renal damage induced by dehydration. These data may
be relevant for heat stress nephropathy as well as for other renal pathologies
due to the current generalized consumption of fructose and deficient hydration
habits.