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In the thymus of Db and AKR mice, a series of experiments were carrred out in an attempt to reveal some properties characteristic of “PAS cells”. These PAS positive and sudanophilic reticular cells scattered mainly in the cortex of the thymus showed the affinity to aldehyde-fuchsin and a positive reaction to Schmorl test, indicating the presence of lipofuscins in the cells. Mast cells, which occur numerously in the mouse thymus and show histochemical reactions which are partly found also in the PAS cells, could always be distinguished from the latter with Nile blue, alcian blue-safranine and toluidine blue stainings. No transitional forms between PAS cells and mast cells were observed.With reference to the recent proposition of PANSKY and HOUSE (1965) that the “aldehyde-fuchsin positive reticulum cells”, probably identical with our PAS cells, correspond to the B-cells of pancreatic islets, a comparative study of the both types of cell was carried out. By means of histochemical method of OKAMOTO, PAS cells were found to contain as much zinc as in pancreatic islet cells. Spectrophotometric examination revealed, however, that the metal contained in the former cells was represented simply by zinc, whereas that in the latter by zinc and some other metals such as cadmium. The administration of alloxan did not have any effect on PAS cells, whereas it caused definite degenerative changes in pancreatic B-cells.

Histochemical Studies of PAS Positive Reticular Cells in Mouse Thymus, with Special Reference to Their Relation to Mast Cells and Pancreatic B-Cells