Abstract
This investigation studied the possibility of activating lepromatous macrophages by a local `in vivo' test.
Lepromatous macrophages have an evident incapacity for clearing M. leprae. This is demonstrated by injecting lepromatous patients with an antigen containing M. leprae from human tissue at a concentration of 640 × 106 bacteria per ml. This produces a nodule which, at a 30-day biopsy, shows a macrophagic granuloma with numerous bacteria inside the macrophages, proving that these cells are unable to remove M. leprae. This incapacity is specific for M. leprae, and all other mycobacteria produce a different reaction.
Local `in vivo' stimulation of the lepromatous macrophage was obtained by injecting M. leprae in the same concentration as above but mixed with other mycobacteria (M. lepraemurium or BCG).
The mixed antigens produced a tuberculoid granuloma with abundant lymphoid cells. Fite–Faraco stains showed almost no acid-fast bacteria. Therefore, our mixture of antigens had activated the macrophages locally and made them competent for clearing M. leprae.
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