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Autoradiographic examinations were made of tissue sections of the lung and liver following 3 daily injections of [14C] adenine (14C]A) and [3H] thymidine (3H] TdR) (1μCi/g body weight each)into lats and mice. It was levealed that alveolar wall cells of the lung, particularly macrophages, were intensely labeled with [14C] A even after RNase treatment. In contrast, sinusoidal cells of the liver, including Kupffer cells within the lobules, showed almost no labeling with [14C] A following RNase treatment, although these cells were intensely labeled with [3H] TdR in fairly large numbers. In view of our earlier observations that monocyte precursors in the bone marrow in rats, and a portion of blood monocytes as well, are labeled with [14C]A to an extraordinarily great degree, it can be stated that the present findings in the lung support the view that tissue macrophages are detived from monocytes, but that corresponding findings in the liver do not favor such a view.

Labeling Patterns of Alveolar Macrophages and Kupffer Cells with [14C] adenine and [3H] thymidine in Rats and Mice