title: Implementation of a regulatory gene network to simulate the TH1/2 differentiation in an agent-based model of hypersensitivity reactions.
abstract: BACKGROUND
  An unbalanced differentiation of T helper cells from precursor type TH0 to the TH1 or TH2 phenotype in immune responses often leads to a pathological condition. In general, immune reactions biased toward TH1 responses may result in auto-immune diseases, while enhanced TH2 responses may cause allergic reactions. The aim of this work is to integrate a gene network of the TH differentiation in an agent-based model of the hyper-sensitivity reaction. The implementation of such a system introduces a second level of description beyond the mesoscopic level of the inter-cellular interaction of the agent-based model. The intra-cellular level consists in the cell internal dynamics of gene activation and transcription. The gene regulatory network includes genes-related molecules that have been found to be involved in the differentiation process in TH cells.
  
  
  RESULTS
  The simulator reproduces the hallmarks of an IgE-mediated hypersensitive reaction and provides an example of how to combine the mesoscopic level description of immune cells with the microscopic gene-level dynamics.
  
  
  BACKGROUND
  The basic version of the simulator of the immune response can be downloaded here: http://www.iac.cnr.it/~filippo/C-ImmSim.html
authors.affiliation: Institute for Computing Applications 'M. Picone', National Research Council (CNR), V.le del Policlinico, 13700161 Rome, Italy.
authors.forename: Daniele
authors.initials: D
authors.lastname: Santoni
authors.forename: Marco
authors.initials: M
authors.lastname: Pedicini
authors.forename: Filippo
authors.initials: F
authors.lastname: Castiglione
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D003198:Computer Simulation; D016207:Cytokines / Q000276:immunology*; D005786:Gene Expression Regulation / Q000276:immunology*; D006801:Humans; D006967:Hypersensitivity / Q000276:immunology* / Q000473:pathology; D018448:Models, Immunological; D015398:Signal Transduction / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology* / Q000473:pathology; D018418:Th2 Cells / Q000276:immunology* / Q000473:pathology; D015533:Transcriptional Activation
chemical_list: D016207:Cytokines