Figure 4 Confocal microscopy of IFA for anti- Aal DNV.

Photomicrographs of immunofluorescence for anti-AalDNV capsid protein in cells from cultures Combretastatin A4 mw persistently co-infected with 3 viruses. Red = anti-AalDNV and blue = pseudocolor for T0-PRO-3 iodide staining of DNA (nuclei). a = image for anti-AalDNV only; b = image for T0-PRO-3 only; c = phase contrast image; d = combined images. Figure 5 Confocal microscopy selleck chemical of IFA for anti-DEN. Photomicrographs of immunofluorescence for anti-DEN envelope protein in cells from cultures persistently co-infected with 3 viruses. Red = anti-DEN and blue = pseudocolor for T0-PRO-3 iodide staining of DNA (nuclei). a = image for anti-DEN only; b = image for T0-PRO-3 only; c = phase contrast image; d = combined images. In an earlier report [1] stable, persistent infections of AalDNV and DEN-2 alone in C6/36 cells were characterized by viral

antigen located predominantly in the cytoplasm. By contrast, cells persistently co-infected with AalDNV and DEN-2 [1] showed a shift in AalDNV antigen from predominance in the cytoplasm to predominance in the nucleus, while DEN-2 remained exclusively in the cytoplasm. In a report on persistent infections by JE, also in C6/36 cells, it was reported [3] that viral antigen at early passage was predominant in the cytoplasm but that it was also present somewhat in the nucleus, while at late Alanine-glyoxylate transaminase passage overall fluorescence was decreased and was distributed about LY2603618 in vitro equally in the cytoplasm

and nucleus. This was similar to earlier results reported for cells persistently infected with DEN-2 alone [1]. In our triple co-infections, antigens for all 3 viruses were most strongly detected in the nucleus and only AalDNV showed any signal in the cytoplasm. Thus, the distribution for AalDNV antigen was the same as in previously described, dual co-infections (i.e., dominant in the nucleus but also present in the cytoplasm) while antigens for DEN-2 and JE were both found only in the nucleus. The curious intranuclear restriction for DEN-2 and JE was contrary to the expected cytoplasmic location for RNA viruses. Clearly, the addition of JE to the dual co-infection resulted in a shift of DEN-2 antigen from the cytoplasm to the nucleus and restriction of JE antigen to the nucleus in what could be interpreted as an adaptive, cellular response. We have no explanation for the curious and unexpected distribution of JE and DEN-2 viral antigens exclusively in the nuclei of cells from the persistent, triple co-infections. Nor have we found any explanation for this phenomenon in the literature. There are only earlier reports describing cytoplasmic (dominant) and intranuclear (minor) fluorescence for viral antigens in C6/36 cells persistently infected with DEN-2 alone [1] or JE alone [3], without an explanation as to why.