RESUMO
Wound healing is a complex biological process that involves integration of hemostasis, inflammation, proliferation and tissue remodeling. An extract of pineapple (Ananas comosus) stem demonstrates several therapeutics properties, including acceleration of wound healing. Tacorin is a water crude extract derived from the stem of A. comosus with high protein content. The effect of tacorin on wound healing in vivo was examined using rats with an induced injury. Wound closure was faster with tacorin treatment than in the untreated group. An in vitro study was conducted on mammalian cells (3T3-L1) to observe the effect of tacorin on cell proliferation. Tacorin was first heated to inactivate its proteolytic activity. It increased the viability of 3T3-L1 cells in a dose-dependent manner. Excessive inflammation was suppressed by tacorin as shown by decreased tumor necrosis factor α expression. Treatment with tacorin increased the expression of transforming growth factor ß, a major player in tissue remodeling. Moreover, tacorin also reduced the expression of MMP-2 to accelerate the recovery of the wound. Taken together, tacorin is able to accelerate the wound-healing process by increasing cell proliferation, suppressing inflammation and accelerating tissue remodeling.
RESUMO
Etoposide (ETP) treatment of ataxia telangiectasia mutated (ATM) and Rad3-related protein (ATR)-, topoisomerase-binding protein-1 (TopBP1) and human MutY homolog (hMYH)-depleted cells results in a significant reduction in apoptotic signaling. The association between ATR or TopBP1 and hMYH increased following ETP treatment. In hMYH knockdown cells, the interaction between ATR and TopBP1 decreased following ETP treatment. We suggest that hMYH functions as a sensor of ETP-induced apoptosis. The results suggest that in the absence of hMYH, cells are unable to recognize the damage signal and the ATR pathway is not activated.