Retrospective study of ameloblastoma: the possibility of conservative treatment.

At our institutions, most cases of the solid or multicystic type were treated as conservatively as possible in order to avoid disadvantages of radical treatment. The aim of present study was to retrospectively analyze the ameloblastoma cases diagnosed at our two institutions, to classify them according to the criteria of the 2005 WHO classification, and to evaluate the possibility of using a conservative approach for the surgical treatment of ameloblastoma. Maxillary cases, unicystic cases, peripheral cases and resection-treated cases were excluded from this study.

Defect of human immunodeficiency virus type 2 Gag assembly in Saccharomyces cerevisiae.

We have previously shown that the expression of human immunodeficiency virus type 1 (HIV-1) Gag protein in Saccharomyces cerevisiae spheroplasts produces Gag virus-like particles (VLPs) at the plasma membrane, indicating that yeast has all the host factors necessary for HIV-1 Gag assembly. Here we expand the study by using diverse primate lentiviral Gags and show that yeast does not support the production of HIV-2 or simian immunodeficiency virus SIVmac Gag VLPs but allows the production of SIVagm and SIVmnd Gag VLPs. Particle budding was observed at the surfaces of cells expressing SIVagm and SIVmnd Gags, but cells expressing HIV-2 and SIVmac Gags showed only membrane-ruffling structures, although they were accompanied with electron-dense submembrane layers, suggesting arrest at an early stage of particle budding.