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2018 ; 22
(3
): 1696-1707
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Hypothalamic POMC expression is required for peripheral insulin action on hepatic
gluconeogenesis through regulating STAT3 in sepsis rats
#MMPMID29285858
Feng B
; Zhang N
; Duan K
; Shi B
J Cell Mol Med
2018[Mar]; 22
(3
): 1696-1707
PMID29285858
show ga
Liver injury and dysregulated glucose homoeostasis are common manifestations
during sepsis. Although plenty of studies reported insulin could protect against
multiple organ injuries caused by critical infections among patients, little was
known about the precise mechanism. We investigated whether liver inflammatory
pathway and central neuropeptides were involved in the process. In sepsis rats,
hepatic IKK/NF-?B pathway and STAT3 were strongly activated, along with reduced
body weight, blood glucose and suppressed hepatic gluconeogenesis (GNG).
Peripheral insulin administration efficiently attenuated liver dysfunction and
glucose metabolic disorders by suppressing hypothalamic anorexigenic neuropeptide
proopiomelanocortin (POMC) expression, hepatic NF-?B pathway and STAT3
phosphorylation. Furthermore, knockdown of hypothalamic POMC significantly
diminished protective effect of insulin on hepatic GNG and insulin-induced STAT3
inactivation, but not inflammation or IKK/NF-?B pathway. These results suggest
that hepatic IKK/NF-?B pathway mediates the anti-inflammatory effect of insulin
in septic rats, and peripheral insulin treatment may improve hepatic GNG by
inhibiting STAT3 phosphorylation dependent on hypothalamic POMC expression.