[COMPARATIVE ANALYSIS OF TIGHT JUNCTIONS OF EPITHELIUM OF RATS JEJUNUM UNDER THE EFFECT OF LIPOPOLYSACCHARIDE AND...

Area of Science:

• Gastroenterology
• Cell Biology
• Toxicology

Context:

• The intestinal barrier, regulated by tight junctions between enterocytes, is crucial for maintaining homeostasis.
• Lipopolysaccharides (LPS) and cholera toxin are potent agents known to disrupt cellular functions.

Purpose:

• To comparatively analyze the ultrastructural alterations of rat jejunum enterocytes and their tight junctions upon exposure to lipopolysaccharides and cholera toxin.
• To elucidate the specific changes in enterocyte morphology and intercellular junction integrity induced by these toxins.

Summary:

• Exposure of rat jejunum segments to lipopolysaccharides resulted in altered enterocyte shape due to increased intercellular space, without tight junction destruction. Some cells showed desmosome loss and enlarged nuclei.
• Cholera toxin induced similar ultrastructural changes, including increased intercellular space and altered cell shape, also without tight junction disruption. Reductions in microvilli and lateral membrane folding were observed.
• Both lipopolysaccharides and cholera toxin demonstrated a comparable impact on enterocyte ultrastructure and tight junction regions, characterized by intercellular space widening but preserved junction integrity.

Impact:

• Provides insights into the mechanisms by which bacterial toxins affect intestinal barrier function at the cellular level.
• Highlights the differential effects on tight junctions versus other cellular components, informing potential therapeutic strategies for toxin-induced enteropathies.
• Establishes a basis for further research into the specific signaling pathways involved in toxin-induced enterocyte alterations.