Simultaneous visualization of two antigens in the same tissue section by combining immunoperoxidase with immunofluorescence techniques.

A simple method was developed whereby immunoperoxidase and immunofluorescence techniques were applied in consecutive steps to demonstrate the presence of two antigens in the same tissue section. This method was applied in three model, two antigens were shown: a) each (gastrin and pepsinogen II) inside one of two different cell types (gastrin (G) and antral peptic cells), b) each (kappa or gamma light chains) inside different cells of the same type (plasma cells); also, both (kamma and gamma light chains) inside the same cell (Reed-Sternberg cell), and c) both (pepsinogen I and II) inside the same cell (chief cell of oxyntic glands). The results could be viewed and photographed either simultaneously, when the antigens were in different cells, or sequentially, when the antigens were in the same cells.