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Cancer Res 2007 Oct 15;67(20):9903-12

Interleukin-4 cytotoxin therapy synergizes with gemcitabine in a mouse model of pancreatic ductal adenocarcinoma.

Shimamura T, Royal RE, Kioi M, Nakajima A, Husain SR, Puri RK

Puri RK (reprint author), NIH Bldg 29B,Room 2NN0,HFM 735,29 Lincoln Dr, Bethesda, MD 20892 USA US FDA, Ctr Biol Evaluat & Res, Div Cellular & Gene Therapies, Tumor Vaccines & Biotechnol Branch, Rockville, MD 20857 USA NCI, Surg Branch, NIH, Bethesda, MD 20892 USA Yokohama City Univ, Grad Sch Med, Div Gastroenterol, Yokohama, Kanagawa 232 Japan


Targeting cell surface receptors with cytotoxins or immunotoxins provides a unique opportunity for tumor therapy. Here, we show the efficacy of the combination therapy of gemcitabine with an interleukin-4 (IL-4) cytotoxin composed of IL-4 and truncated Pseudomonas exotoxin in animal models of pancreatic ductal adenocarcinoma (PDA). We have observed that 42 of 70 (60%) tumor samples from patients with PDA express moderate- to high-density surface IL-4 receptor (IL-4R), whereas normal pancreatic samples express no or low-density IL-4R. IL-4 cytotoxin was specifically and highly cytotoxic [50% protein synthesis inhibition (IC(50)) ranging from >0.1 to 13 ng/mL] to six of eight pancreatic cancer cell lines, whereas no cytotoxicity (IC(50) >1,000 ng/mL) was observed in normal human pancreatic duct epithelium cells, fibroblasts, and human umbilical vein endothelial cells (HUVEC). We also showed that IL-4 cytotoxin in combination with gemcitabine exhibited synergistic antitumor activity in vitro. To confirm synergistic antitumor activity in vivo and monitor precise real-time disease progression, we used a novel metastatic and orthotopic mouse model using green fluorescent protein-transfected cancer cells and whole-body imaging system. The combination of both agents caused complete eradication of tumors in 40% of nude mice with small established PDA tumors. In addition, combined treatment significantly prolonged the survival of nude mice bearing day 14 advanced distant metastatic PDA tumors. Similar results were observed in mice xenografted with PDA obtained from a patient undergoing surgical resection. These results indicate that IL-4 cytotoxin combined with gemcitabine may provide effective therapy for the treatment of patients with PDA. [Cancer Res 2007;67(20):9903-12].

Category: Journal Article
PubMed ID: #17942922
Includes FDA Authors from Scientific Area(s): Biologics
Entry Created: 2011-10-04 Entry Last Modified: 2012-08-29