Comparison of uptake and cytotoxicity of anti-Yo antibody versus three other antibodies specific for the intracellular Purkinje cell proteins: calbindin, calmodulin, and PCP-2.

<p>The top row of panels demonstrates uptake and accumulation of IgG (red) within Purkinje cells after 96 hours in cultures incubated with anti-calmodulin, anti-calbindin, anti PCP-2, or anti-Yo IgGs. Entry of SYTOX green into Purkinje cells containing IgG, indicative of cell membrane injury and death (yellow), was seen in only in cultures incubated with anti-Yo IgGs (examples shown by arrows). The lower panels show only SYTOX green staining of Purkinje cells in cultures incubated with the antibodies indicated. In the culture incubated with anti-PCP-2. SYTOX staining indicative of cell death is seen in a single cell outside the Purkinje cell layer (asterisk) but not in Purkinje cells. Cultures were followed through 144 hours. There was progression of cell death in cultures incubated with anti-Yo antibodies. In contrast, cultures incubated calbindin, calmodulin, and PCP-2 did not exhibit Purkinje cell death above background levels seen in controls incubated with normal human IgG (data not shown). Scale bar = 20μ.