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Deprecated: Implicit conversion from float 278.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Mol+Pharm 2014 ; 11 (10): 3484-91 Nephropedia Template TP
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Adjuvant Cationic Liposomes Presenting MPL and IL-12 Induce Cell Death, Suppress Tumor Growth, and Alter the Cellular Phenotype of Tumors in a Murine Model of Breast Cancer #MMPMID25179345
Meraz IM; Savage DJ; Segura-Ibarra V; Li J; Rhudy J; Gu J; Serda RE
Mol Pharm 2014[Oct]; 11 (10): 3484-91 PMID25179345show ga
Dendritic cells (DC) process and present antigens to T lymphocytes, inducing potent immune responses when encountered in association with activating signals, such as pathogen-associated molecular patterns. Using the 4T1 murine model of breast cancer, cationic liposomes containing monophosphoryl lipid A (MPL) and interleukin (IL)-12 were administered by intratumoral injection. Combination multivalent presentation of the Toll-like receptor-4 ligand MPL and cytotoxic 1,2-dioleoyl-3-trmethylammonium-propane lipids induced cell death, decreased cellular proliferation, and increased serum levels of IL-1? and tumor necrosis factor (TNF)-?. The addition of recombinant IL-12 further suppressed tumor growth and increased expression of IL-1?, TNF-?, and interferon-?. IL-12 also increased the percentage of cytolytic T cells, DC, and F4/80+ macrophages in the tumor. While single agent therapy elevated levels of nitric oxide synthase 3-fold above basal levels in the tumor, combination therapy with MPL cationic liposomes and IL-12 stimulated a 7-fold increase, supporting the observed cell cycle arrest (loss of Ki-67 expression) and apoptosis (TUNEL positive). In mice bearing dual tumors, the growth of distal, untreated tumors mirrored that of liposome-treated tumors, supporting the presence of a systemic immune response.