Résumé
· AlM: To study the effect of bone mesenchymal stem cells ( BMSCs ) and chondroitinaseABC ( ChABC ) on photoreceptor apoptosis in the retina of sodium iodate-induced rats. ·METHODS:Forty Sprague Dawley rats ( SD rats) were intraperitoneally injected with NalO3 (30g/L, 100mg/kg) to establish the retinal degeneration models ( postnatal 28d).These rats were devided into 4 groups.Group A was not injected, group B was injected with BMSCs, group C was injected with BMSCs and ChABC, and group D was injected with phosphate buffer saline ( PBS).After 28d, subretinal injection were applied. Hematoxyln - eosinstaining ( HE ) , tunel and immunohistochemistry were performed at 21d after subretinal injection. · RESULTS: Photoreceptor number and photoreceptor apoptosis rate of B and C groups were more than those of A and D groups, and there was significant difference statistically ( P 0.05 ) .Glial fibrillary acidic protein ( GFAP) was expressed by BMSCs after intraocular injection. · CONCLUSlON: BMSCs and ChABC injected into subretinal space may alleviate photoreceptor apoptosis so as to protect retinal photoreceptor cells in degenerated rats.
Résumé
<p><b>OBJECTIVE</b>To study the inhibitive effects of gastric cancer cell-dendritic cell fusion vaccine on tumor cells of proliferation cycle.</p><p><b>METHODS</b>Peripheral blood mononuclear cells were separated from gastric cancer patients and co-cultured with granulocyte macrophage colony stimulating factors(GM-CSF), interleukin-4(IL-4) and tumor necrosis factor-alpha(TNF-alpha) to generate mature dendritic cells. The dendritic cells and SGC7901 cells were fused by polyethylene glycol, and the pure fusion cells were screened out by selective culture systems. The inhibitive effects of gastric cancer cell-dendritic cell fusion vaccines on tumor cell proliferation cycle in vivo and in vitro were detected by flow cytometry.</p><p><b>RESULTS</b>Treated with the fusion vaccine in vitro, the percentages of G(0)/G(1), S and G(2)/M cells of tumor cells were (76.77+/- 4.38)%, (16.50+/- 2.90)% and (6.73+/- 1.59)% respectively. There were significant differences in the percentages of different cell cycle tumor cells between the tumor cells treated with the fusion vaccine and those co-cultured with dendritic cell or T cells alone(P< 0.01). The proliferative index of the tumor cells treated with the fusion vaccine was 23.34+/- 3.51, significantly lower than those co-cultured with dendritic cell and controls (P< 0.05).</p><p><b>CONCLUSIONS</b>Fusion vaccines can affect cell cycle of the tumor cells, thus inhibit tumor cell proliferation and growth.</p>