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5-Hydroxytryptamine in the enterochromaffin cells of the guinea pig alimentary tract

Summary

The histoohemical properties of the EC in the guinea pig alimentary canal were studied using the paraformaldehyde-induced fluorescence and five ordinary staining reactions. The fluorescence reaction was observed to be the most sensitive and specific one in the demonstration of the EC. Using the fluorescence and argyrophil techniques concomitantly, it was stated that all the fluorescent EC had also argyrophil properties. These observations lend further support to the author's earlier statement (Penttilä), 1966) that there is only one principal type of EC in the gastrointestinal tract. The argentaffin and other staining reactions were not able to colour all the EC, except in the duodenum.

In the quantitative part of this study the EC number (No./mm) and the 5-HT (μg/g) concentration were determined from the adjacent tissue pieces. Both quantities were absolutely at its highest in the duodenum and decreased in the caudal direction of the intestine. In the stomach the values were of the same magnitude as in the middle part of the intestinal tract. In the oesophagus there were no EC and the 5-HT content was negligible in comparison to the other gastrointestinal sites. The correlation between the EC number and the 5-HT content was highly significant from the stomach to the rectum. The 5-HT content per one EC was the largest in the duodenum. Comparing the histochemical and quantitative results the 5-HT location in the enterochromaffin system was discussed.

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Penttilä, A. 5-Hydroxytryptamine in the enterochromaffin cells of the guinea pig alimentary tract. Histochemie 11, 185–194 (1967). https://doi.org/10.1007/BF00571725

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Keywords

  • Middle Part
  • Quantitative Result
  • Intestinal Tract
  • Adjacent Tissue
  • Alimentary Tract