P. aeruginosa is a gram-negative bacterium that causes a variety of diseases in compromised hosts. Bacterial endotoxins such as LPS are the major outer surface membrane components present in almost all gram-negative bacteria and act as extremely strong stimulators of innate immunity and inflammation of the airway. The present study was undertaken to determine the effect of combined administration of Gentamicin (GENT) as antibiotic and Dexamethasone (DEXA) as ant-inflammatory drug on some physiological, immunological and histological parameters. After determination of LD50 of P. aeruginosa, mice groups were injected with DEXA, GENT and LPS alone or in combination. LPS single injection caused a significant increase of total protein, globulin, total leukocyte count, lymphocytes, neutrophils and level of IgM and IgG. DEXA induced an increase of serum total lipid, ALT and AST levels, neutrophilia and lymphopenia. GENT administration increased serum total protein, globulin, total lipid, ALT and AST levels. Physiological and immunological examination demonstrated that combined treatment has a significant effect as decreaseing serum total protein, globulin, lymphocytes and IgG level than single treatment. Histological examination demonstrated that the inflammation of thymus, spleen, lymph node and liver decreases in mice received combined treatment than those received individual treatment. Concurrent administration of DEXA and GENT has greatest effect in protecting organs against damage in case of endotoximia.
Table of Contents
Abstract
Introduction and Aim of Work
Review of Literature
Materials and Methods
Results
Discussion
Summary
References
Research Objectives and Focus Areas
This study aims to evaluate the physiological, immunological, and histological effects of administering Gentamicin (GENT) as an antibiotic and Dexamethasone (DEXA) as an anti-inflammatory drug, both individually and concurrently, in mice affected by a Pseudomonas aeruginosa bacterial infection (LPS).
- The impact of LPS-induced bacterial endotoxemia on organ health and immune response.
- The therapeutic potential of combining antibiotics with anti-inflammatory drugs to mitigate tissue damage.
- Analysis of biochemical markers including total protein, albumin, globulin, total lipid, ALT, and AST.
- Histological examination of vital organs such as the thymus, spleen, lymph nodes, and liver.
Excerpt from the Book
Pseudomonas aeruginosa
Pseudomonas aeruginosa (P. aeruginosa) is an opportunistic pathogen that causes a wide range of acute and chronic infections (Upritchard et al., 2008). Endotoxin or lipopolysaccharide (LPS) is a component of the outer membrane of gram-negative bacteria and it has been implicated as an important inducer of the local and systemic responses to such a bacterial infection (Kohn and Kung, 1995). It releases in excess during antibiotic therapy, activates the immunological and inflammatory reaction (Ngeleka et al., 1990). However, in conditions where the body is exposed to bacterial endotoxin excessively (during severe infection and sepsis with gram-negative bacteria) or systemically (when endotoxin enters the blood stream "endotoxemia"), a systemic inflammatory reaction can occur, leading to tissue injury, metabolic and neuroendocrine changes, multiple organ damage and/or dysfunction, circulatory shock, and potentially death (Amersfoort et al., 2003). The host response to LPS is crucial in the defence against gram-negative bacterial infection.Cells of the myeloid lineage are capable of recognizing picomolar (equal 10−9 mol/m3) quantities of LPS and respond, via several signal transduction cascades, with the release of a wide range of pro-inflammatory cytokines (Rietschel et al., 1994).
Summary of Chapters
Abstract: This section provides an overview of the study, describing the experimental model using P. aeruginosa and the results of combined treatment with GENT and DEXA on various physiological parameters.
Introduction and Aim of Work: This chapter introduces the role of P. aeruginosa as a pathogen and defines the research goal of assessing the therapeutic effects of GENT and DEXA on infected mice.
Review of Literature: This section covers existing knowledge regarding bacterial distribution, endotoxin properties, immune responses to bacteria, and existing treatment methodologies.
Materials and Methods: This chapter details the experimental animals, the preparation of bacterial endotoxins, the challenge test, dosage protocols for the drugs, and the techniques used for blood and histological analysis.
Results: This section presents the empirical data derived from the study, including LD50 determination, biochemical studies, immunological data, and findings from the histological examinations.
Discussion: This chapter interprets the findings, comparing them to previous research on the effects of antibiotics and corticosteroids on endotoxemia and organ damage.
Summary: This concluding chapter synthesizes the primary findings and observations gathered throughout the study regarding the protective efficacy of the concurrent treatment.
References: This section lists all scientific literature and sources cited throughout the experimental report.
Keywords
P. aeruginosa, LPS, Dexamethasone, Gentamicin, immunoglobulin, total protein, albumin, globulin, total lipid, AST, ALT, total leukocyte count, endotoxemia, histological examination.
Frequently Asked Questions
What is the core focus of this research?
The research focuses on the impact of bacterial endotoxins from P. aeruginosa on host organisms and how concurrent treatment with antibiotics (Gentamicin) and anti-inflammatory drugs (Dexamethasone) modulates this response.
What are the primary thematic fields covered?
The study spans microbiology, immunology, clinical biochemistry, and histopathology in the context of treating bacterial sepsis and endotoxemia.
What is the primary objective of this work?
The objective is to evaluate whether a combined administration of GENT and DEXA can protect organs from damage and manage the physiological and immunological imbalances caused by an LPS-induced bacterial infection.
Which scientific methods were employed?
The study utilized in vivo animal modeling using male albino Swiss mice, followed by hematological analysis, serum biochemical assays (Biuret method, ALT/AST measurement), and histological examination of tissue sections using Hematoxylin and Eosin (H & E) staining.
What topics are discussed in the main body?
The main body covers the characterization of LPS, the physiological effects of endotoxin on liver enzymes and serum proteins, immunological responses (IgM/IgG), and the histological impact on thymus, spleen, lymph nodes, and liver.
Which keywords define this work?
The work is defined by terms such as Pseudomonas aeruginosa, endotoxemia, Dexamethasone, Gentamicin, immunotoxicity, and cytokine response.
How does LPS affect the liver according to the study?
LPS injection resulted in focal necrosis within the hepatic parenchyma, congestion in central veins, and steatohepatitis, indicating significant liver injury.
Did the concurrent treatment effectively protect the organs?
Yes, the results indicate that the concurrent administration of DEXA and GENT ameliorated inflammatory responses and protected vital organs compared to individual treatment protocols.
- Arbeit zitieren
- Azza El Amir (Autor:in), 2014, Effect of concurrent administration of an antibiotic and an anti-inflammatory drug on the immunotoxicity of bacterial endotoxins, München, GRIN Verlag, https://www.grin.com/document/276241
