Ultrastructural investigations of the enterochromaffin-like (ECL) cells in three different rat strains (Sprague-Dawley, Fischer 344, Wistar) after treatment with the H+,K(+)-ATPase inhibitor pantoprazole.
The purpose of the present study was the evaluation of ultrastructural characteristics of the enterochromaffin-like (ECL) cells in the fundic mucosa of three different rat strains without treatment and after treatment with the H+, K(+)-ATPase inhibitor pantoprazole. In the study, 20 one year old female Sprague Dawley (SD), Fischer 344 (F) and Wistar (W) rats each were treated orally for three months with 4 mg pantoprazole/kg/d or with the vehicle only. The control animals showed close conformity of ECL cell density and morphology in all three strains. Treatment with pantoprazole led to a significant increase in serum gastrin concentration and GPC density in all strains. However, the electron microscopically determined ECL cell density was markedly increased in the SD strain only. Ultrastructurally all treated rats showed activation of the ECL cells, and enhanced histamine release. The SD and F strains had an enhanced proportion of large ECL cell granules, with the F rats also showing an increased granule density. In contrast, the treated W rats were found to have a lower granule density and a higher proportion of small and medium sized granules compared to their controls.
Rohr
I
I
Institute for Pathology and Toxicology BYK Gulden, Hamburg, Germany.
Ockert
D
D
Reznik
G K
GK
D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors; D000818:Animals; D001562:Benzimidazoles / Q000494:pharmacology*; D002452:Cell Count; D004759:Enterochromaffin Cells / Q000187:drug effects* / Q000648:ultrastructure*; D005260:Female; D005753:Gastric Mucosa / Q000166:cytology* / Q000187:drug effects; D008854:Microscopy, Electron; D009853:Omeprazole / Q000031:analogs & derivatives; D000077402:Pantoprazole; D051381:Rats; D011916:Rats, Inbred F344; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D013045:Species Specificity; D013454:Sulfoxides / Q000494:pharmacology*
D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D001562:Benzimidazoles; D013454:Sulfoxides; D000077402:Pantoprazole; D000251:Adenosine Triphosphatases; D009853:Omeprazole