In general antibiotics interact cooperatively with host defences, weakening and decreasing the virulence of microbial pathogens, thereby increasing vulnerability to phagocytosis and eradication by the intrinsic antimicrobial systems of the host. Antibiotics, however, also interact with host defences by several other mechanisms, some harmful, others beneficial. Harmful activities include exacerbation of potentially damaging inflammatory responses, a property of cell-wall targeted agents, which promotes the release of pro-inflammatory microbial cytotoxins and cell-wall components. On the other hand, inhibitors of bacterial protein synthesis, especially macrolides, possess beneficial anti-inflammatory/cytoprotective activities, which result from interference with the production of microbial virulence factors/cytotoxins. In addition to these pathogen-directed, anti-inflammatory activities, some classes of antimicrobial agent possess secondary anti-inflammatory properties, unrelated to their conventional antimicrobial activities, which target cells of the innate immune system, particularly neutrophils. This is a relatively uncommon, potentially beneficial property of antibiotics, which has been described for macrolides, imidazole anti-mycotics, fluoroquinolones, and tetracyclines. Although of largely unproven significance in the clinical setting, increasing awareness of the pro-inflammatory and anti-inflammatory properties of antibiotics may contribute to a more discerning and effective use of these agents.
Williams, Aurelia Alvina(University of Pretoria, 2012-06-07)
Background: Immunological events due to infection by the human immunodeficiency virus (HIV) perturb mitochondrial function which augments virus-induced metabolic imbalances. Organic acids, established biomarkers of ...
Carstens, Maryke; McCrindle, Tyronne K.; Adams, Nicolette; Diener, Anastashia; Guzha, Delroy T.; Murray, Shane L.; Parker, Jane E.; Denby, Katherine J.; Ingle, Robert A.(Public Library of Science, 2014-10-10)
The Arabidopsis constitutive induced resistance 1 (cir1) mutant displays salicylic acid (SA)-dependent constitutive expression
of defence genes and enhanced resistance to biotrophic pathogens. To further characterise the ...
Moritz, Robin F.A.; Kurze, Christoph; Routtu, Jarkko(Elsevier, 2016-03)
Organisms living in large groups, such as social insects, are particularly vulnerable to parasite transmission.
However, they have evolved diverse defence mechanisms which are not only restricted to the