Delayed effects of antibiotic therapy in endotoxinemia

Abstract

BACKGROUND: Nowadays, due to the increasing number of infectious and inflammatory diseases, the problem of the use of antibacterial drugs becomes especially important. As a result of the action of toxins, inflammatory processes can affect the central nervous system with the subsequent development of neuroinflammation. Activation of neuroinflammation leads to dysregulation of many physiological functions. These negative appearances can be observed even after a long period. It is known that doxycycline is a tetracycline-type antibiotic, which is able to penetrate the blood-brain barrier and has anti-inflammatory activity.

AIM: The aim of this study was to investigate the nature of delayed physiological changes in rats against the background of administration of the antibacterial drug doxycycline in the LPS-induced model of neuroinflammation.

MATERIALS AND METHODS: Four groups of Wistar rats, 10 males in each group, were used in the experiment. The first group was injected once intraperitoneally with physiological solution, the second group — with lipopolysaccharide (1 mg/kg). Animals of the third and fourth groups received intragastrically doxycycline solution (25 mg/kg) daily for two weeks. On the 15th day of the experiment, rats from the fourth group were injected with lipopolysaccharide (1 mg/kg). Body weight of animals, mass coefficients of immunocompetent organs, as well as behaviour and motor activity of rats in the “Open Field” test were evaluated at several time points.

RESULTS: It was shown that systemic injection of lipopolysaccharide led to an increase in the mass coefficients of spleen, kidneys and adrenal glands compared to the group of animals receiving doxycycline beforehand. These changes were noted 48 h and 2 months after the injection of endotoxin. In the “Open Field” test, animals that were injected with doxycycline and lipopolysaccharide showed no violations of motor activity and research behavior, unlike the group that received only lipopolysaccharide.

CONCLUSIONS: It can be assumed that the physiological effects of doxycycline in the lipopolysaccharide-induced model of neuroinflammation revealed at early and late terms are not limited to the antibacterial effect of the drug and are mediated by anti-inflammatory and potential neuroprotective effects on the central nervous system.

Keywords

neuroinflammation / endotoxinemia / antibacterial drugs / doxycycline / behavior / rats

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