Abstract | BACKGROUND: The urinary bladder is an ideal organ for topical treatment. A substantial number of bladder cancer patients are resistant to conventional intravesical therapy. In search of new agents, antisense oligonucleotides (AS-ON) may be interesting candidates. The availability and toxicity as well as the effectivity of AS-ON after intravesical instillation in different rodent models were examined. MATERIALS AND METHODS: Acute toxicity of AS-ON was tested by intravenous application (215-1,000 mg/kg body weight (bw)) in NMRI mice ( n=30). The uptake and distribution of isotope-labelled AS-ON in bladder tissue was determined in Sprague Dawley rats (n=12) by radioactivity after intravesical application (2.5 mg/kg bw 3H-labelled AS-ON). Additionally, uptake and effectivity studies of AS-ON in tumors were performed in MB-49 bladder cancer-bearing C57/B16 mice (n=6) by immunohistochemistry and fluorescence microscopy. RESULTS: No systematic side-effects were noticed after intravenous application of physiological doses of AS-ON in NMRI mice. The mortality rate was 20% at the highest dose of 1,000 mg/kg bw. The highest AS-ON availability after intravesical application in rats was noticed in the bladder wall (12.3 microg/g), while the systemic concentration was low (1.1 microg/g). In fluorescence microscopy analysis, AS-ON were detected in the outer cells of the bladder wall and around vessels. AS-ON accumulated in the cytoplasm and in the nuclei. Immunohistochemical analysis demonstrated a reduction of the Ki-67 positivity after treatment with AS-ON (43%) compared to the untreated controls (58%). CONCLUSION:
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Authors | Caroline E Blietz, Beate Thode, Martin Hauses, Ralph Pries, Alexander J Meyer, Christian Doehn, Dieter Jocham, Ingo Kausch |
Journal | In vivo (Athens, Greece)
(In Vivo)
2009 Jan-Feb
Vol. 23
Issue 1
Pg. 13-9
ISSN: 0258-851X [Print] Greece |
PMID | 19368119
(Publication Type: Journal Article)
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Chemical References |
- Antineoplastic Agents
- Biomarkers, Tumor
- Ki-67 Antigen
- Oligonucleotides, Antisense
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Topics |
- Administration, Intravesical
- Animals
- Antineoplastic Agents
(pharmacokinetics, toxicity)
- Biomarkers, Tumor
(metabolism)
- Cell Line, Tumor
- Cell Proliferation
(drug effects)
- Dose-Response Relationship, Drug
- Female
- Injections, Intravenous
- Ki-67 Antigen
(genetics, metabolism)
- Longevity
(drug effects)
- Male
- Mice
- Mice, Inbred C57BL
- Neoplasm Transplantation
- Oligonucleotides, Antisense
(pharmacokinetics, toxicity)
- Rats
- Rats, Sprague-Dawley
- Toxicity Tests, Acute
- Urinary Bladder
(drug effects, metabolism)
- Urinary Bladder Neoplasms
(drug therapy, metabolism, pathology)
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