ABSTRACT
Objective To investigate the effect of tetrandrine (Tet) on experimental choroidal neovascularization and the effect of Tet on retinal structure and function. Methods Choroidal neovascularization was induced in 20 Brown Norway (BN) rats (40 eyes) by diode laser (wavelength: 810 nm; exposal time: 0.1 second; facular diameter:100 ?m; energy: 120 mW), and the rats were divided randomly into experimental and control group with 10 rats (20 eyes) in each group. In experimental group, 0.05 ml Tet with the concentration of 3.21 ?mol/L was injected intravitreously 0 and 3 days after laser photocoagulation; in the control group, the rats underwent an intravitreous injection with the same volume of sodium chloride solution. The incidence of CNV was evaluated by fundus fluorescein angiography (FFA) 14 days after laser photocoagulation. Five right eyes of another Five healthy BN rats underwent intravitreous injection with 0.05 ml Tet with the concentration of 3.21 ?mol/L, and an intravitreous injection with the same volume of sodium chloride solution was performed on the left eyes. Before injection, 1 hour, and 1 day after the first injection, and 1 hour, 1 day, 7 days, 14 days after the second injection the electroretinography (ERG) was performed on these 5 rats; 14 days after the second injection, the retinae were examined by light microscopy and transmission electron microscopy. Results The incidence of CNV was 23.26% in experimental group,which was obviously lower than that in the control group (63.33%) (P0.05). There were no structural changes of retinal tissues examined by light and electron microscopy. Conclusion Tet may inhibit choroidal neovascularization in rats; there isn′t any significant toxic effect of intravitreous injection with Tet on retina at the dosage of 3.21 ?mol/L.
ABSTRACT
Objective:To probe into the effects of tetrandrine on fibroblast proliferation derived from hypertrophic scars and evaluate the role of tetrandrine in the treatment of scars.Methods:Taking the cultured fibroblasts derived from human hypertrophic scars as model,the effects of tetrandrine on fibroblast proliferation and content of extracellular collagen were observed and analyzed by MTT reduction assay,flow cytometry after propidium iodide staining and modified chloraseptine T oxidizing assay.Besides,their relationship was analyzed by linear correlation.Results:Growth curve descent,TD prolonging and extracellular collagen reduction in a dosage and time dependent manner were observed.Moreover,they changed in positive correlation with each other.Conclusion:Tetrandrine can inhibit fibroblast biological action derived from hypertrophic scars,which is one of the mechanism of anti-scarring action of tetrandrine.