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2001, Number 2

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Vet Mex 2001; 32 (2)

Brucella genus and its interaction with the mononuclear phagocytic system

Aréstegui MB, Gualtieri SC, Domínguez J, Scharovsky OG

Language: English/Spanish
References: 60
Page: 131-139
PDF size: 81.32 Kb.


ABSTRACT

Non-specific resistance is a fundamental component of the host immune response. The mononuclear phagocytic system (MPS) is part of innate resistance effector mechanisms, and is involved in several homeostatic, inflammatory and immunologic events. Mononuclear phagocytes (MNP), which are cells belonging to the MPS, play a central role in the main functions of multicellular organisms. Its early interaction with pathogens determines the evolution of the infection. Bacteria, which can resist intracellular death, survive and multiply within the cells of the MPS, are considered endocellular parasites. Brucella genus that infects humans as well as several animal species is an endocellular pathogen. The vast majority of these microorganisms includes mechanisms genetically coded that enable them to invade and to survive within the host cells. In the present review, characteristics of Brucella genus are described; special reference is dedicated to its antigenic composition, virulence factors, as well as its genomic structure and the control of gene expression. Interaction between MPS and Brucella spp, and the effector mechanisms of MNP, mainly, plus the generation of oxygen and nitrogen radicals, the limitation in iron availability and cytokine production are analyzed. The control of infection is explained by cell mediated immunity and the phenomena of natural resistance is also taken into consideration.


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