1887

Abstract

The anti-neoplastic effect of chicken anemia virus VP3 protein (apoptin) was investigated in Rous sarcoma virus (RSV)-transformed chicken embryo fibroblast (CEF) cells and in RSV-induced tumours of specific-pathogen-free (SPF) chicks . The apoptin gene was cloned in the pVAX expression vector and expression of the recombinant vector pVAX-CAV-VP3 was confirmed. Two groups of SPF chicks, each containing ten chicks, were used. Chicks in groups I and II were inoculated with RSV at 1 day old. Group I served as the control, receiving pVAX vector without insert, and group II received recombinant vector pVAX-CAV-VP3 containing the apoptin gene, on day 10. An study confirmed that apoptin induced apoptosis in RSV-transformed CEF cells, which was demonstrated by observation of the characteristic changes of apoptosis using the indirect immunofluorescence technique and acridine orange/ethidium bromide staining. study also indicated that apoptin induced apoptosis and caused tumour regression by an intratumoral-delivery method. Apoptotic changes, such as nuclear condensation, fragmentation of the chromatin and formation of apoptic bodies in the tumour cells, were demonstrated by histopathology and acridine orange/ethidium bromide staining. No apoptotic changes were seen in the tumours of the control group. The results of the present study showed that apoptin had an anti-neoplastic effect and in RSV-induced tumours. The anti-neoplastic effect is due to apoptin-induced apoptosis. Further improvements in the dose, delivery method and delivery frequency of the apoptin-expressing recombinant vector could help to develop apoptin as an anti-neoplastic drug.

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2006-10-01
2020-11-25
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