Naturally occurring oncolytic viruses are live, replicationproficient
viruses that specifically infect human cancer cells
while sparing normal cell counterparts. Since the eradication
of smallpox in the 1970s with the aid of vaccinia viruses,
the vaccinia viruses and other genera of poxviruses have
shown various degrees of safety and efficacy in pre-clinical
or clinical application for human anti-cancer therapeutics.
Furthermore, we have recently discovered that cellular tumor
suppressor genes are important in determining poxviral
oncolytic tropism. Since carcinogenesis is a multi-step
process involving accumulation of both oncogene and tumor
suppressor gene abnormalities, it is interesting that poxvirus
can exploit abnormal cellular tumor suppressor signaling
for its oncolytic specificity and efficacy. Many tumor suppressor
genes such as p53, ATM, and RB are known to play
important roles in genomic fidelity/maintenance. Thus, tumor
suppressor gene abnormality could affect host genomic
integrity and likely disrupt intact antiviral networks due to
accumulation of genetic defects, which would in turn result
in oncolytic virus susceptibility. This review outlines the characteristics
of oncolytic poxvirus strains, including vaccinia,
myxoma, and squirrelpox virus, recent progress in elucidating
the molecular connection between oncogene/tumor
suppressor gene abnormalities and poxviral oncolytic tropism,
and the associated preclinical/clinical implications. I would
also like to propose future directions in the utility of poxviruses
for oncolytic virotherapy.
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Mutants in highly conserved region I (YGDTDS) of the adenovirus serotyope 2 DNA polymerase (Ad Pol) have been shown previously to be defective in assays for initiation and elongation of adenovirus DNA replication in vitro. A selected subset of these mutants was characterized in a number of assays to determine in more detail the nature of the defect that they cause in Ad Pol. The single amino acid substitution in this sequence motif had no detectable effect on binding either to factors required for viral DNA replication or to Ad DNA origin. However, in the deletion mutant mimicking a similar sequence found in the Klenow fragment and in RNA polymerases, binding to Ad DNA origins was reduced. When the nucleotide and template specificity of partially purified mutant Ad Pol proteins was checked there were no significant differences between mutant and wild-type Ad Pols in RNA polymerase assays both on DNA templates and on RNA templates. In reverse transcription assays, both wild type and mutant Ad Pol were inactive, with the exception of a Gly to Met replacement mutant which mimicked the sequence found in reverse transcriptase; this mutant showed low but reproducible levels of reverse transcriptase activity when compared to wt Ad Pol. Taken together, these results suggest that region I may influence template specificity during DNA synthesis, although the single replacement is not sufficient to convert Ad Pol to a reverse transcriptase or an RNA polymerase. Region I probably acts independently of other regions of Ad Pol that are responsible for DNA binding, since mutations in this sequence did not significantly alter adenovirus DNA origin interactions in gel shift assays.
Human mitochondrial aldehyde dehydrogenase 2 (ALDH2) is mainly responsible for oxidation of acetaldehyde generated during alcohol oxidation in vivo. A full-length cDNA of human liver ALDH2 was successfully expressed using a vaccinia virus-T7 RNA polymerase system. The expressed ALDH2 had an enzymatic activity as high as the native human liver ALDH2 enzyme.