title: Two types of cytotoxic lymphocyte regulation explain kinetics of immune response to human immunodeficiency virus.
abstract: The organization of the cytotoxic T lymphocyte (CTL) response at organismal level is poorly understood. We propose a mathematical model describing the interaction between HIV and its host that explains 20 quantitative observations made in HIV-infected individuals and simian immunodeficiency virus-infected monkeys, including acute infection and response to various antiretroviral therapy regimens. The model is built on two modes of CTL activation: direct activation by infected cells and indirect activation by CD4 helper cells activated by small amounts of virus. Effective infection of helper cells by virus leads to a stable chronic infection at high virus load. We assume that CTLs control virus by killing infected cells. We explain the lack of correlation between the CTL number and the virus decay rate in therapy and predict that individuals with a high virus load can be switched to a low-viremia state that will maintain stability after therapy, but the switch requires fine adjustment of therapy regimen based on the model and individual parameters.
authors.affiliation: Department of Molecular Biology and Microbiology, Tufts University, 136 Harrison Avenue, Boston, MA 02111, USA. irouzine@tufts.edu
authors.forename: I M
authors.initials: IM
authors.lastname: Rouzine
authors.forename: R A
authors.initials: RA
authors.lastname: Sergeev
authors.forename: A I
authors.initials: AI
authors.lastname: Glushtsov
mesh_terms: D000818:Animals; D044966:Anti-Retroviral Agents / Q000627:therapeutic use; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000821:virology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology / Q000821:virology; D003198:Computer Simulation; D006678:HIV / Q000187:drug effects / Q000276:immunology*; D015658:HIV Infections / Q000188:drug therapy / Q000276:immunology* / Q000821:virology; D006801:Humans; D007700:Kinetics; D008213:Lymphocyte Activation / Q000187:drug effects / Q000276:immunology; D008253:Macaca mulatta; D018448:Models, Immunological; D015302:Simian Immunodeficiency Virus / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology* / Q000821:virology*
chemical_list: D044966:Anti-Retroviral Agents