Preclinical evaluation of gene delivery methods for the treatment of loco-regional disease in breast cancer.

Hdl Handle:
http://hdl.handle.net/10147/135646
Title:
Preclinical evaluation of gene delivery methods for the treatment of loco-regional disease in breast cancer.
Authors:
Rajendran, Simon; O'Hanlon, Deirdre; Morrissey, David; O'Donovan, Tracey; O'Sullivan, Gerald C; Tangney, Mark
Affiliation:
Cork Cancer Research Centre, Mercy University Hospital and Leslie C Quick Jnr. Laboratory, University College Cork, Cork, Ireland.
Citation:
Preclinical evaluation of gene delivery methods for the treatment of loco-regional disease in breast cancer. 2011, 236 (4):423-34 Exp. Biol. Med. (Maywood)
Journal:
Experimental biology and medicine (Maywood, N.J.)
Issue Date:
1-Apr-2011
URI:
http://hdl.handle.net/10147/135646
DOI:
10.1258/ebm.2011.010234
PubMed ID:
21444371
Additional Links:
http://www.ncbi.nlm.nih.gov/pubmed/21444371
Abstract:
Preclinical results with various gene therapy strategies indicate significant potential for new cancer treatments. However, many therapeutics fail at clinical trial, often due to differences in tissue physiology between animal models and humans, and tumor phenotype variation. Clinical data relevant to treatment strategies may be generated prior to clinical trial through experimentation using intact patient tissue ex vivo. We developed a novel tumor slice model culture system that is universally applicable to gene delivery methods, using a realtime luminescence detection method to assess gene delivery. Methods investigated include viruses (adenovirus [Ad] and adeno-associated virus), lipofection, ultrasound (US), electroporation and naked DNA. Viability and tumor populations within the slices were well maintained for seven days, and gene delivery was qualitatively and quantitatively examinable for all vectors. Ad was the most efficient gene delivery vector with transduction efficiency >50%. US proved the optimal non-viral gene delivery method in human tumor slices. The nature of the ex vivo culture system permitted examination of specific elements. Parameters shown to diminish Ad gene delivery included blood, regions of low viability and secondary disease. US gene delivery was significantly reduced by blood and skin, while tissue hyperthermia improved gene delivery. US achieved improved efficacy for secondary disease. The ex vivo model was also suitable for examination of tissue-specific effects on vector expression, with Ad expression mediated by the CXCR4 promoter shown to provide a tumor selective advantage over the ubiquitously active cytomegalovirus promoter. In conclusion, this is the first study incorporating patient tissue models in comparing gene delivery from various vectors, providing knowledge on cell-type specificity and examining the crucial biological factors determining successful gene delivery. The results highlight the importance of in-depth preclinical assessment of novel therapeutics and may serve as a platform for further testing of current, novel gene delivery approaches.
Item Type:
Article
Language:
en
MeSH:
Aged; Breast Neoplasms; Female; Humans; Infant, Newborn; Middle Aged; Oncolytic Virotherapy; Transfection
ISSN:
1535-3699

Full metadata record

DC FieldValue Language
dc.contributor.authorRajendran, Simonen
dc.contributor.authorO'Hanlon, Deirdreen
dc.contributor.authorMorrissey, Daviden
dc.contributor.authorO'Donovan, Traceyen
dc.contributor.authorO'Sullivan, Gerald Cen
dc.contributor.authorTangney, Marken
dc.date.accessioned2011-07-08T13:36:38Z-
dc.date.available2011-07-08T13:36:38Z-
dc.date.issued2011-04-01-
dc.identifier.citationPreclinical evaluation of gene delivery methods for the treatment of loco-regional disease in breast cancer. 2011, 236 (4):423-34 Exp. Biol. Med. (Maywood)en
dc.identifier.issn1535-3699-
dc.identifier.pmid21444371-
dc.identifier.doi10.1258/ebm.2011.010234-
dc.identifier.urihttp://hdl.handle.net/10147/135646-
dc.description.abstractPreclinical results with various gene therapy strategies indicate significant potential for new cancer treatments. However, many therapeutics fail at clinical trial, often due to differences in tissue physiology between animal models and humans, and tumor phenotype variation. Clinical data relevant to treatment strategies may be generated prior to clinical trial through experimentation using intact patient tissue ex vivo. We developed a novel tumor slice model culture system that is universally applicable to gene delivery methods, using a realtime luminescence detection method to assess gene delivery. Methods investigated include viruses (adenovirus [Ad] and adeno-associated virus), lipofection, ultrasound (US), electroporation and naked DNA. Viability and tumor populations within the slices were well maintained for seven days, and gene delivery was qualitatively and quantitatively examinable for all vectors. Ad was the most efficient gene delivery vector with transduction efficiency >50%. US proved the optimal non-viral gene delivery method in human tumor slices. The nature of the ex vivo culture system permitted examination of specific elements. Parameters shown to diminish Ad gene delivery included blood, regions of low viability and secondary disease. US gene delivery was significantly reduced by blood and skin, while tissue hyperthermia improved gene delivery. US achieved improved efficacy for secondary disease. The ex vivo model was also suitable for examination of tissue-specific effects on vector expression, with Ad expression mediated by the CXCR4 promoter shown to provide a tumor selective advantage over the ubiquitously active cytomegalovirus promoter. In conclusion, this is the first study incorporating patient tissue models in comparing gene delivery from various vectors, providing knowledge on cell-type specificity and examining the crucial biological factors determining successful gene delivery. The results highlight the importance of in-depth preclinical assessment of novel therapeutics and may serve as a platform for further testing of current, novel gene delivery approaches.-
dc.language.isoenen
dc.relation.urlhttp://www.ncbi.nlm.nih.gov/pubmed/21444371en
dc.subject.meshAged-
dc.subject.meshBreast Neoplasms-
dc.subject.meshFemale-
dc.subject.meshHumans-
dc.subject.meshInfant, Newborn-
dc.subject.meshMiddle Aged-
dc.subject.meshOncolytic Virotherapy-
dc.subject.meshTransfection-
dc.titlePreclinical evaluation of gene delivery methods for the treatment of loco-regional disease in breast cancer.en
dc.typeArticleen
dc.contributor.departmentCork Cancer Research Centre, Mercy University Hospital and Leslie C Quick Jnr. Laboratory, University College Cork, Cork, Ireland.en
dc.identifier.journalExperimental biology and medicine (Maywood, N.J.)en

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