Vascular Participation in Tumor Slice Metabolism

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Abstract
Tissue slices from mammary carcinoma and diverse normal tissues of mice of different strains were incubated in triphenyltetrazolium chloride (TTC) solns. with and without fluoride, malonate, azide and succinate. Frozen section examination after such treatment revealed formazan deposition in the vascu-lature and stroma of the tumor but none in the tumor cells themselves. This manifestation of dehydrogenase activity in the stromal vessels was not inhibited by fluoride, malonate or azide; a finding confirmed by quantitative detns. of [mu]g. of TTC reduced/mg. of acetone-dried tumor tissue. No such stromal dehydrogenase activity was found in slices of normal mammary parenchyma, adrenal cortex or medulla, kidney, liver, skin or lymph node. These findings are discussed in terms of a unique function of tumor capillaries.
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