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2015 ; 5
(ä): 476-84
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Hyaluronic acid regulates a key redox control factor Nrf2 via phosphorylation of
Akt in bovine articular chondrocytes
#MMPMID26106522
Onodera Y
; Teramura T
; Takehara T
; Fukuda K
FEBS Open Bio
2015[]; 5
(ä): 476-84
PMID26106522
show ga
One important pharmacological function of hyaluronic acid (HA) in chondrocytes is
reduction of cellular superoxide generation and accumulation. Here we
demonstrated a relationship between HA supplementation and accumulation of
Nuclear factor-erythroid-2-related factor 2 (Nrf2), which is a master
transcription factor in cellular redox reactions, in cultured chondrocytes
derived from bovine joint cartilage. In HA-treated chondrocytes, expression of
Nrf2 and its downstream genes was upregulated. In HA-treated chondrocytes, Akt
was phosphorylated, and inhibition of Akt activity or suppression of HA receptors
CD44 and/or RHAMM with siRNAs prevented HA-mediated Nrf2 accumulation.
Furthermore, Nrf2 siRNA inhibited the HA effect on antioxidant enzymes. These
results show that HA might contribute to ROS reduction through Nrf2 regulation by
activating Akt. Our study suggests a new mechanism for extracellular matrix
(ECM)-mediated redox systems in chondrocytes.