Linked Life Data

15003868

Source:http://linkedlifedata.com/resource/pubmed/id/15003868

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2004-3-8
pubmed:abstractText
The expression of therapeutic genes by oncolytic viruses is a promising strategy to improve viral oncolysis, to augment gene transfer compared with a nonreplicating adenoviral vector, or to combine virotherapy and gene therapy. Both the mode of transgene expression and the locale of transgene insertion into the virus genome critically determine the efficacy of this approach. We report here on the properties of oncolytic adenoviruses which contain the luciferase cDNA fused via an optimized internal ribosome entry site (IRES) to the immediate early adenoviral gene E1A (AdDeltaE1AIL), the early gene E2B (AdDeltaE2BIL), or the late fiber gene (AdDeltafiberIL). These viruses showed distinct kinetics of transgene expression and luciferase activity. Early after infection, luciferase activities were lower for these viruses, especially for AdDeltaE2BIL, compared with nonreplicating AdTL, which contained the luciferase gene expressed from the strong CMV promoter. However, 6 days after infection, luciferase activities were approximately four (AdDeltaE1AIL) to six (AdDeltafiberIL) orders of magnitude higher than for AdTL, reflecting virus replication and efficient transgene expression. Similar results were obtained in vivo after intratumoral injection of AdDeltaE2BIL, AdDeltafiberIL, and AdTL. AdDeltafiberIL and the parental virus, Ad5-Delta24, resulted in similar cytotoxicity, but AdDeltaE2BIL and AdDeltaE1AIL were slightly attenuated. Disruption of the expression of neighboring viral genes by insertion of the transgene was minimal for AdDeltaE2BIL and AdDeltafiberIL, but substantial for AdDeltaE1AIL. Our observations suggest that insertion of IRES-transgene cassettes into viral transcription units is an attractive strategy for the development of armed oncolytic adenoviruses with defined kinetics and strength of transgene expression.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0042-6822
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
320
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
121-34
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed-meshheading:15003868-Adenoviridae, pubmed-meshheading:15003868-Adenovirus E1A Proteins, pubmed-meshheading:15003868-Adenovirus E2 Proteins, pubmed-meshheading:15003868-Animals, pubmed-meshheading:15003868-Artificial Gene Fusion, pubmed-meshheading:15003868-Cell Line, Tumor, pubmed-meshheading:15003868-Female, pubmed-meshheading:15003868-Gene Expression Regulation, pubmed-meshheading:15003868-Gene Therapy, pubmed-meshheading:15003868-Genes, Viral, pubmed-meshheading:15003868-Genetic Vectors, pubmed-meshheading:15003868-Humans, pubmed-meshheading:15003868-Luciferases, pubmed-meshheading:15003868-Mice, pubmed-meshheading:15003868-Mice, Nude, pubmed-meshheading:15003868-Neoplasms, Experimental, pubmed-meshheading:15003868-Proto-Oncogene Proteins, pubmed-meshheading:15003868-RNA, Messenger, pubmed-meshheading:15003868-Ribosomes, pubmed-meshheading:15003868-Time Factors, pubmed-meshheading:15003868-Transgenes
pubmed:year
2004
pubmed:articleTitle
Mode of transgene expression after fusion to early or late viral genes of a conditionally replicating adenovirus via an optimized internal ribosome entry site in vitro and in vivo.
pubmed:affiliation
Division of Human Gene Therapy, Department of Medicine, and the Gene Therapy Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't