Enhancement of tumor thermal therapy using gold nanoparticle-assisted tumor necrosis factor-alpha delivery

Molecular Cancer Therapeutics
Rachana VisariaJohn C Bischof

Abstract

Tumor necrosis factor-alpha (TNF-alpha) is a potent cytokine with anticancer efficacy that can significantly enhance hyperthermic injury. However, TNF-alpha is systemically toxic, thereby creating a need for its selective tumor delivery. We used a newly developed nanoparticle delivery system consisting of 33-nm polyethylene glycol-coated colloidal gold nanoparticles (PT-cAu-TNF-alpha) with incorporated TNF-alpha payload (several hundred TNF-alpha molecules per nanoparticle) to maximize tumor damage and minimize systemic exposure to TNF-alpha. SCK mammary carcinomas grown in A/J mice were treated with 125 or 250 microg/kg PT-cAu-TNF-alpha alone or followed by local heating at 42.5 degrees C using a water bath for 60 minutes, 4 hours after nanoparticle injection. Increases in tumor growth delay were observed for both PT-cAu-TNF-alpha alone and heat alone, although the most dramatic effect was found in the combination treatment. Tumor blood flow was significantly suppressed 4 hours after an i.v. injection of free TNF-alpha or PT-cAu-TNF-alpha. Tumor perfusion, imaged by contrast enhanced ultrasonography, on days 1 and 5 after treatment revealed perfusion defects after the injection of PT-cAu-TNF-alpha alone and, in many regions, c...Continue Reading

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