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Immunohistochemical localization of pancreatic secretory trypsin inhibitor in fetal and adult pancreatic and extrapancreatic tissues

M Fukayama, Y Hayashi, M Koike, M Ogawa and G Kosaki

Pancreatic secretory trypsin inhibitor (PSTI) has been thought to be only a secretory trypsin inhibitor of human pancreas, but the serum content of immunoreactive PSTI is elevated without pancreatic disease. Using the peroxidase-antiperoxidase method, immunoreactive cells for PSTI were found in human pancreas, stomach, duodenum, appendix, colon and urinary tract of both fetus and adult, adult gall bladder, and fetal lung. PSTI-immunoreactive cells were identified in fetal pancreas at the tenth gestational week, and in extrapancreatic tissues at the sixteenth (gastrointestinal and urinary tract) and twentieth weeks (lung). PSTI-immunoreactive cells of fetal lung were present in neuroepithelial bodies. Strongly positive cells in fetal duodenum were argyrophilic and resembled endocrine cells. Immunohistochemical study was also performed on tissues associated with inflammatory diseases of gastrointestinal tract. The distribution pattern of immunoreactive cells in the stomach varied in accordance with chronic gastritis. Immunoreactive cells were also found in endocrine micro-nests and in a carcinoid tumor associated with fundic gastritis. These results suggest that PSTI may play some physiological role other than secretory trypsin inhibition of the pancreas.

Volume 34, Issue 2, pp. 227-235, 02/01/1986
Copyright © 1986 by The Histochemical Society


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