Apigenin inhibits indoxyl sulfate-induced endoplasmic reticulum stress and anti-proliferative pathways, CHOP and IL-6/p21, in human renal proximal tubular cells

OBJECTIVE: Indoxyl sulfate (IS) has been reported to induce endoplasmic reticulum (ER) stress in tubular cells and to inhibit the cell proliferation via ER stress and ERK/IL-6/p21 pathways. This study has investigated the effect of apigenin on IS-induced ER stress in immortalized human renal proximal tubular HK-2 cells. MATERIALS AND METHODS: Human Kidney 2 (HK-2) cells were treated with IS (5 mM) in the absence or presence of apigenin (10 mu M) or salubrinal (20 mu M) for indicated times under the serum-free condition. Cell viability was evaluated by MTT assay. The levels of protein expression and phosphorylation were evaluated by Western blot analysis. RESULTS: In HK-2 cells, apigenin completely inhibited IS-induced ER stress, as indicated by decreased expression of CHOP, ATF4 and GRP78, although the phosphorylated level of eIF2 alpha did not decrease. IS-induced expression levels of IL-6 and p21 proteins were also inhibited by apigenin, with no significant changes in ERK activation. The suppression of cell proliferation by IS was abolished by salubrinal, an ER stress inhibitor, but not by apigenin. Apigenin inhibited the phosphorylation of Akt and GSK-3 beta in IS-treated HK-2 cells. The phosphorylation of GSK-3 beta, which was inhibited by apigenin, resulted in hypo-phosphorylation of retinoblastoma (Rb) protein, which was associated with the decrease in cyclin D1 expression. CONCLUSIONS: These results suggest that apigenin may inhibit IS-induced ER stress and expression of IL-6 and p21 proteins in HK-2 cells. It is most likely that apigenin, together with its inhibitory effect on ER stress, may also suppress the cell growth by inducing the loss of Rb phosphorylation, which was associated with the de-crease in cyclin D1 expression by GSK-3 beta activation through the inhibition of PI3K/Akt pathway.