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Clindamycin-induced enterocolitis in hamsters.

R H Lusk, R Fekety, J Silva

    The Journal of Infectious Diseases
    |April 1, 1978
    PubMed
    Summary
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    This article reviews how the antibiotic clindamycin causes a fatal intestinal inflammation in hamsters, which mimics antibiotic-associated colitis in humans. The study highlights how the drug alters gut bacteria, leading to an overgrowth of specific harmful microbes and the potential release of toxins that damage the bowel.

    Area of Science:

    • Gastroenterology research within Clindamycin-induced enterocolitis models
    • Infectious disease pathology and microbiology

    Background:

    Antibiotic-associated intestinal inflammation remains a significant clinical challenge in modern medicine. Researchers have long sought to understand why specific drugs trigger severe bowel damage in patients. That uncertainty drove the development of animal models to replicate human gastrointestinal pathology. Prior research has shown that certain antimicrobial agents disrupt the delicate balance of the gut microbiome. This gap motivated scientists to examine how these disruptions lead to lethal outcomes in controlled settings. Previous investigations established that hamsters are highly susceptible to drug-induced intestinal distress. However, the exact microbial shifts and subsequent tissue damage mechanisms required further clarification. This study addresses these historical questions by characterizing the physiological response to a commonly used antibiotic.

    Purpose Of The Study:

    The primary aim of this research was to characterize the development of lethal intestinal inflammation following antibiotic exposure. Scientists sought to determine if this model accurately replicates the pathology seen in human patients. The study investigated the specific microbial shifts that occur within the gut after drug administration. Researchers intended to clarify whether direct bacterial invasion or toxin production causes the observed tissue damage. The motivation for this work stemmed from the need to understand the pathogenesis of antibiotic-associated colitis. By quantifying changes in the bowel flora, the team hoped to identify the organisms responsible for the syndrome. This effort sought to rule out potential viral contributors to the inflammatory process. The study ultimately aimed to provide evidence supporting the hypothesis that clostridial toxins drive the disease.

    Keywords:
    antibiotic-associated colitisgut microbiome disruptionClostridium difficile infectionpseudomembranous colitis model

    Frequently Asked Questions

    The researchers propose that the condition arises from the activity of clostridial toxins. These substances are produced by specific bacteria within the gut, which flourish after the administration of the antibiotic, leading to severe inflammation and pseudomembrane formation in the intestinal lining.

    The study identifies the overgrowth of Clostridium difficile and Clostridium sordellii as key microbial shifts. In contrast, populations of Peptostreptococcus and Corynebacterium were observed to decline significantly following the administration of the drug.

    The researchers note that the intestinal lesions do not contain visible bacteria. This observation suggests that the damage is mediated by secreted factors, such as toxins, rather than direct tissue invasion by the microbes themselves.

    Quantitative stool cultures were utilized to track microbial population dynamics. This approach allowed the investigators to compare the abundance of various bacterial groups before and after the challenge with the antibiotic.

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    Main Methods:

    The investigation employed a controlled animal model to evaluate the effects of antibiotic administration. Researchers administered the drug through both oral and parenteral routes to the subjects. The team utilized quantitative stool cultures to monitor shifts in the microbial community. Histological examination allowed for the detailed assessment of tissue damage within the intestinal tract. The study design included a specific challenge dose of 100 mg per kilogram of body weight. Investigators performed systematic searches for viral pathogens to exclude non-bacterial causes of the syndrome. The approach focused on comparing the intestinal flora before and after the drug exposure. This methodology provided a comprehensive view of the physiological and microbiological changes occurring during the disease progression.

    Main Results:

    The administration of the antibiotic triggered a lethal inflammatory reaction in the intestinal tract. Histological analysis revealed the presence of pseudomembrane formation, which is characteristic of the condition. Quantitative cultures demonstrated a significant decrease in Peptostreptococcus and Corynebacterium populations following the challenge. Conversely, the numbers of Escherichia coli and Streptococcus faecalis increased during the disease state. The data also showed a marked rise in clindamycin-resistant Clostridium sordellii and Clostridium difficile. Investigators confirmed that no bacteria were visible within the damaged intestinal tissues. Furthermore, the team failed to isolate any viruses from the affected subjects. These results indicate a clear correlation between the antibiotic-induced microbial shift and the development of severe bowel pathology.

    Conclusions:

    The authors propose that the observed syndrome results from the activity of clostridial toxins. This synthesis suggests that the antibiotic environment promotes the proliferation of toxin-producing organisms. The researchers indicate that the intestinal damage is not caused by direct bacterial invasion of the tissue. They observe that the pathology closely mirrors clinical cases of antibiotic-induced colitis in humans. The study implies that the alteration of the bowel flora is a primary driver of the disease process. The findings support the hypothesis that clindamycin creates conditions favorable for harmful microbial overgrowth. The evidence suggests that the absence of viral agents rules out non-bacterial causes for the observed inflammation. These conclusions provide a framework for understanding the complex interaction between drug administration and intestinal health.

    The researchers administered 100 mg of the drug per kilogram of body weight. This specific dosage was chosen because it is comparable to the amounts typically used in human clinical treatment protocols.

    The authors state that this model serves as a valuable tool for studying antibiotic-induced colitis. They suggest that the findings help explain the pathogenesis of similar conditions observed in human patients receiving antimicrobial therapy.