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The present study was carried out to determine whether the mechanically activated cation channel Piezo1 protein plays a role as a signaling pathway which causes the apoptosis of human chondrocytes. The chondrocytes were isolated, cultured, and then subjected to mechanical stretch force for 0, 2, 12, 24 and 48 h, respectively. The expression levels of Piezo1 and the apoptosis-related protein caspase-12 were assessed by reverse transcription-quantitative polymerase chain reaction, as well as the apoptosis-related genes, B cell lymphoma/leukemia-2 (Bcl-2), Bcl-associated X protein (Bax) and Bcl-2-associated death promoter (BAD). Lactate dehydrogenase (LDH) activity was used to discern dead cells. Piezo1 expression was determined by immunofluorescence. In addition, Piezo1 inhibitor, GsMTx4, was used to block the mechanically activated (MA) cation channel Piezo1, and served as a positive control. The results showed that the osteoarthritis (OA)-derived chondrocytes showed a tendency to undergo late-stage apoptosis under compressive loading. Piezo1 and caspase-12 were significantly upregulated under static compressive stimuli and the expression was related to the rate of apoptosis of the OA-derived chondrocytes during compressive loading. The expression of caspase-12 and late-stage apoptosis of the human OA-derived chondrocytes were repressed by GsMTx4, the specific inhibitor of Piezo1, while the expression of Piezo1 and the induction of the apoptosis of the OA-derived chondrocytes during compressive loading was not totally blocked. Thus, we conclude that Piezo1 plays an important role in the apoptosis of human OA-derived chondrocytes through a caspase-12-dependent pathway. The expression of Piezo1 protein was not totally inhibited by GsMTx4.
Averrhoa carambola L. (Oxalidaceae) root (ACLR) has a long history of use in traditional Chinese medicine for treating diabetes and diabetic nephropathy (DN). (±)-Lyoniresinol 3α-O-β-D-glucopyranoside (LGP1, LGP2) were two chiral lignan glucosides that were isolated from the ACLR. The purpose of this study was to investigate the effect of LGP1 and LGP2-mediated hypoglycaemia on renal injury in streptozotocin (STZ)-induced diabetic mice. STZ-induced diabetic mice were administrated LGP1 and LGP2 orally (20, 40, 80 mg/kg body weight/d) for 14 days. Hyperglycaemia and the expression of related proteins such as nuclear factor-κB (NF-κB), caspase-3, -8, -9, and Bcl-associated X protein (Bax) were markedly decreased by LGP1 treatment. However, LGP2 treatment had no hypoglycaemic activity. Diabetes-dependent alterations in the kidney such as glomerular hypertrophy, excessive extracellular matrix amassing, and glomerular and tubular basement membrane thickening were improved after 14 days of LGP1 treatment. B cell lymphoma Leukaemia-2 (Bcl-2) expression was reduced in the STZ-induced diabetic mouse kidneys but was enhanced by LGP1 treatment. These findings suggest that LGP1 treatment may inhibit diabetic nephropathy progression and may regulate several pharmacological targets for treating or preventing diabetic nephropathy.
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