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2001 MAY 17 - (NewsRx Network) -- by Deborah W. Heinrich, PhD, staff medical writer Researchers at Beatson Laboratory in Scotland demonstrated that infection with an E1B 55kDa deleted adenovirus (ONYX-0 15) inhibited tumor growth in vivo.
I. Ganly and colleagues noted that the ONYX-015 adenovirus induced lysis of cells with p53 mutations. In this study, they used ONYX-015 to infect human ovarian tumor cell lines with known p53 mutations and chemoresistance and reported their results in Gene Therapy.
The parent cell line, A2780, is chemosensitive to cisplatin and expresses wild-type p53. The mutant p53 derivative, A2780/cp70 is cisplatin resistant. Ganly and coworkers discovered that infection with ONYX-015 resulted in A2780/cp70 cytopathology in vitro and inhibition of tumor growth in vivo. Cytopathology and tumor inhibition were not observed after ONYX-015 infection of the A2780 parent cells.
Interestingly, this research group reported that when the chemosensitive A2780 was infected with ONYX-015, apoptosis increased and clonogenic survival decreased. They found, further, that ONYX-015 infection increased expression of proapoptotic BAX and decreased expression of antiapoptotic BCLXL ("Replication and cytolysis of an EIB-attenuated adenovirus in ...
Source: HighBeam Research, E1B Deleted Adenovirus Infection Inhibits Tumor Growth In Vivo.