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In vitro and in vivo effects of exogenous Leukotriene B4 during Mycobacterium Tuberculosis experimental infection

Grant number: 10/11239-6
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): July 01, 2010
Effective date (End): December 31, 2010
Field of knowledge:Biological Sciences - Immunology - Applied Immunology
Principal Investigator:Lúcia Helena Faccioli
Grantee:Fabiani Gai Frantz
Home Institution: Faculdade de Ciências Farmacêuticas de Ribeirão Preto (FCFRP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil
Associated research grant:02/12856-2 - Modulation of innate and acquired immune responses by leukotrienes and prostaglandins, AP.TEM

Abstract

Leukotrienes (LT) constitute a group of potent biologically active arachidonic acid-derived metabolites (AA) that are implicated as mediators of immediate hypersensitivity reactions and inflammation. During the last years some researches about LT functions had restricted not only to their participation on inflammatory responses, but also as mediators able to modulate the synthesis and liberation of cytokines during adaptative immune response. The participation of LT in host defense mechanisms against infectious agents had been described, as Escherichia coli, Histoplasma capsulatum and Strongyloides venezuelensis. We shown in previous work that experimental infection with Mycobacterium tuberculosis induced enhancement of LTB4 in the lung and the pharmacological inhibition of LT leads to uncontrolled bacterial growth and mice succumb to the infection. Phagocytes, cytokines (Th1 and inflammatory) and reactive nitrogen intermediates are the major antimicrobial mechanisms against tuberculosis infection. Moreover, coupling of LTB4 to its receptor leads to intracellular activation that induces phagocytes and bacterial killing. In this sense, in the experimental infection with M. tuberculosis we will investigate the effects of LTB4 administration in vivo and in vitro. To protect the eicosanoid against extracellular degradation, LTB4 will be encapsulated in cationic liposomes, which ensure the intracellular delivery. For in vivo assay, 5-LO knockout and wild-type mice will be infected by intratracheal route with virulent strain of M. tuberculosis H37RV and treated with LTB4 formulation. Evaluation of the bacterial growth, analyze of some immunological parameters, as cytokine, lipid mediators and nitric oxide production will be performed. For in vitro assay, we will evaluate the effects of LTB4 addition in infected alveolar macrophage to investigate the phagocitosis and microbicidal activity, as well the intracellular signaling involved in this mechanisms and the cytokines and lipid mediators production. Considerable progress has been made on leukotriene research with regard to the characterization of the biological, pharmacological, and pathophysiological actions of these potent mediators and with this work, we intend to complement the knowledge about immune response in tuberculosis, as well provide understanding for the application of lipid mediators as therapeutic adjuvant against infectious diseases.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SORGI, CARLOS ARTERIO; SOARES, ELYARA MARIA; ROSADA, ROGERIO SILVA; BITENCOURT, CLAUDIA SILVA; ZOCCAL, KARINA FURLANI; TARTARI PEREIRA, PRISCILLA APARECIDA; FONTANARI, CAROLINE; BRANDAO, IZAIRA; MASSON, ANA PAULA; RAMOS, SIMONE GUSMAO; SILVA, CELLO LOPES; FRANTZ, FABIANI GAI; FACCIOLI, LUCIA HELENA. Eicosanoid pathway on host resistance and inflammation during Mycobacterium tuberculosis infection is comprised by LTB4 reduction but not PGE(2) increment. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR BASIS OF DISEASE, v. 1866, n. 3 MAR 1 2020. Web of Science Citations: 0.

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