Two human tumors with high basement membrane-producing potential

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Abstract
Two human tumors, an adenoid cystic carcinoma and a yolk sac tumor, were found by immunocytochemical, ultrastructural, and biochemical studies to contain abundant basement membrane matrix in contrast to the vast majority of human tumors which contained either an absent or scant basement membrane matrix. These tumors were established as xenografts in athymic (nude) mice. Both xenografts maintained characteristic histologic features, immunocytochemical localization of basement membrane components, and reasonable yields of native laminin and Type IV collagen throughout three successive transplant generations. Although only a small fraction of the yield of that of the murine Engelbreth‐Holm, Swarm (EHS) sarcoma, the yield of the human basement membrane‐producing tumors could be increased by rendering the mice lathyritic. The human basement membrane proteins so extracted were identical on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS‐PAGE) to their murine counterparts. These human tumors then represent a potential source of human basement membrane proteins.