Summary
Colorectal adenocarcinomas were induced in male Wistar rats, by weekly subcutaneous administration of 1,2-dimethylhydrazine, classified according to the degree of differentiation and submitted to immunocytochemistry for the peptides cholecystokinin (CCK), gastrin, gastric inhibitory polypeptide (GIP), glucagon, neurotensin, pancreatic polypeptide (PP), peptide YY (PYY), somatostatin and vasoactive intestinal polypeptide (VIP) and the biogenic monoamine 5-hydroxytryptamine. Well- or moderately well-differentiated adenocarcinomas comprised 46% of the tumour population, only 4% were poorly-differentiated adenocarcinomas, and the remaining 50% possessed a mixture of these two morphologies. Glucagon, PYY and 5-hydroxytryptamine immunoreactive cells were frequently observed within well- or moderately well-differentiated tumours and within such regions of tumours possessing a mixed morphological pattern. The tumours contained no cells immunoreactive for any of the peptides not normally located within the colorectum, nor did they contain cells immunoreactive for somatostatin and VIP, although known positive controls did stain. Poorly-differentiated tumours and portions of tumours of mixed type, were consistently negative. 5-hydroxytryptamine was the most frequently located of the three antigens, being detected in 87% of the moderately well-differentiated tumours and 32% of the tumours with mixed morphologies. 11% of moderately well-differentiated tumours possessed 5-hydroxytryptamine positive cells in such profusion that they contributed significantly to the tumour mass. The distribution of glucagon-and PYY-immunoreactive cells was similar, although they occurred with a lower frequency, presumably corresponding to their lower numbers within the normal colorectal mucosa. Additionally, these two peptide immunoreactivities were colocalized in the majority of cells, although some cells contained only one antigen. The immense numbers of cells immunoreactive for peptides and monoamine in a significant proportion of colorectal adenocarcinomas suggests that they have arisen from multipotential endodermal stem cells within the tumours and are not part of the normal epithelial population being engulfed as the tumour grows.
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Johnston, C.F., O'Neill, A.B., O'Hare, M.M.T. et al. Neuroendocrine cells within colorectal tumours induced by dimethylhydrazine. Cell Tissue Res. 246, 205–210 (1986). https://doi.org/10.1007/BF00219019
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DOI: https://doi.org/10.1007/BF00219019