Effects of chronic and in utero treatment with diuretics on mouse exocrine cells studied by X-ray microanalysis.

In an attempt to develop an animal model for the disease cystic fibrosis, mice were chronically treated with diuretics. In addition, pregnant mice were treated with diuretics and the effect of this treatment in utero on the newborn mice was studied. Pancreas and submandibular gland acinar cells were investigated by X-ray microanalysis and transmission electron microscopy. Long-term treatment with furosemide (up to 13 months) caused transient changes in the elemental content of the pancreatic acinar cells: a decrease in chloride and sulfur, and an increase in phosphorus, potassium and magnesium. All changes normalized with prolonged treatment. Some morphological changes were found in the zymogen granules. Treatment with amiloride or furosemide in utero caused a decrease in cellular sodium and chloride levels, indicative of inhibition of transepithelial ion and fluid transport. Also treatment of adult animals for two months with amiloride caused lower intracellular sodium and chloride levels. In adult animals only minor effects of diuretic treatment on submandibular gland acinar cells were noted. In utero treatment with amiloride caused an increase in sodium and chloride content indicative of cell damage.