Tumor- and stage-specific therapeutic accessibility of inflammation-related processes to induce response in all tumor types indicates a constitutive spin-off of new systems functions during the metastatic process and differential integration of inflammation into the tumor compartments’ context-dependent ‘living world’, which is featured by tumor- and subtype-specific rationalization processes: Inflammation-related activities are communicatively promoted and differentially PX-478 datasheet adapted during tumor evolution. Empirically, differences may be detected in modalities of evolutionary systems development (heterogeneity in tumor-associated inflammation-related systems), and in the acquired functional impact of inflammation-related systems
(tumor-specific mechanisms of action induced by metronomic low-dose chemotherapy). Availability of markers for ‘late-stage’ response to systems-directed anti-inflammatory
therapies supports the tumors’ modular click here features. Biomodulatory therapies, administered as fixed modules may contribute to discover and understand novel regulatory systems in tumor biology. The study highlights the claim for validity of therapeutic inflammation control as an important prerequisite for tumor control, which is shown to be the basis for action-relevant yes/no statements generating facts on-site in the tumor via biomodulatory therapy modules. O124 Tumor Micoenvironment Is Controled by Procathepsin L Secretion: A New Gene Therapy to Inhibit Progression of Tumors Induced by Human Melanoma Cells Raymond Frade 1 1 INSERM U.672 (former U.354), Immunochemistry of Cell Regulations and Virus Interactions, EVRY, Ile-de-France, France We previously demonstrated that the switch from non to highly tumorigenic phenotype of human melanoma cells is directly related to procathepsin L secretion, which modified tumor microenvironment. Indeed, we demonstrated that secreted procathepsin L cleaves
human C3, the third component of complement and consequently increases cell resistance to complement-mediated cell lysis. In addition, secreted procathepsin L cleaves other extracellular components. We clearly demonstrated the involvement of procathepsin Methocarbamol L secretion in tumor progression by developing three different assays: 1) the inhibition of secreted procathepsin L activity by preincubating human melanoma cells with polyclonal anti-cathepsin L antibodies; 2) the increase of procathepsin L secretion by transfecting non-tumorigenic cells with cathepsin L cDNA to overexpress procathepsin L and to increase its secretion; 3) the inhibition of procathepsin L secretion. This latter was triggered by intracellular expression of an anti-human cathepsin L single chain variable fragment (ScFv), prepared in our laboratory from a monoclonal anti-cathepsin L antibody. In all these previous experiments, melanoma cells were processed before their injection into nude mice. Recently, we designed a new lentiviral 3-MA ic50 vector in which this anti-cathepsin L-ScFv was cloned.