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Rabbit ileal mucosa exposed to fatty acids, bile acids, and other secretagogues

Scanning electron microscopic appearances

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Abstract

Segments of rabbit ileum were examined by scanning electron microscopy (SEM) after exposure to various compounds known to stimulate fluid secretion in the small intestine. After prefusion with ricinoleate (castor oil) at a 10 mM concentration, striking changes were observed at villus tips and on the apicolateral surfaces of villi; erosions at tips were confirmed by light microscopy of the same pieces of tissue examined by SEM. The appearances after ricinoleate were reversed in part during perfusion with control buffer for 2 hr. Statistical comparisons between control perfused, treated, and reversal tissues showed that the “damage” produced by ricinoleate, and its reversal, was significant statistically. Tissues treated with other intestinal secretagogues, oleic acid (10 mM), deoxycholic acid (4 mM), cholic acid (4 mM), dioctyl sodium sulfosuccinate (6 mM), and cholera toxin (1 μg/ml) also showed surface changes by SEM. Fluid secretion, produced by an osmotic agent (mannitol) was not associated with “damage”. Changes in structure of the mucosal surface after exposure to intestinal secretagogues should be considered as one possible mechanism of impaired fluid transport.

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Author notes

  1. T. S. Gaginella PhD

    Present address: Division of Pharmacology, College of Pharmacy, The Ohio State University, 43210, Columbus, Ohio

Authors and Affiliations

  1. Gastroenterology Unit and Department of Anatomy and Pathology, Mayo Medical School and Mayo Foundation, 55901, Rochester, Minnesota

    T. S. Gaginella PhD, J. C. Lewis PhD & S. F. Phillips MD

Authors
  1. T. S. Gaginella PhD
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  2. J. C. Lewis PhD
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  3. S. F. Phillips MD
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Additional information

Supported in part by Research Grant AM-6908 from the National Institutes of Health, Public Health Service, Bethesda, Maryland 20014.

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Gaginella, T.S., Lewis, J.C. & Phillips, S.F. Rabbit ileal mucosa exposed to fatty acids, bile acids, and other secretagogues. Digest Dis Sci 22, 781–790 (1977). https://doi.org/10.1007/BF01694508

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