In the foregoing study (1), infectivity titrations were employed to measure the concentration of influenza virus in portions of chorioallantoic membrane in culture medium containing 2,5-dimethylbenzimidazole. This highly sensitive procedure made possible an examination of the effects of this inhibitory compound (2) on the initial phases of multiplication of the virus; i.e., the first reproducti...

The human tumor/chick embryo model involving grafting of human HT-1080 fibrosarcoma cells on the chorioallantoic membrane was used in conjunction with quantitative real-time Alu PCR to select in vivo a pair of isogenic cell lines (HT-hi/diss and HT-lo/diss), dramatically differing in their ability to disseminate from the primary tumor (i.e., intravasate into the chorioallantoic membrane vascula...

At present there is a lack of standard criteria for the identification and evaluation of activity of antiviral compounds. Interferon was used to explore comparatively several laboratory methods. Interferon was produced in chick embryos and in chorioallantoic membranes suspended in vitro. Evaluation of interferon activity was performed by several methods: (i) percentage of inhibition of plaque-f...

By a method of differential centrifugation and tryptic digestion suspensions of elementary bodies have been prepared from chorioallantoic membranes of chick embryos infected with vaccine virus. The infective titer of the final suspension of elementary bodies was usually the same as that of the original tissue emulsion. Elementary bodies from infected chick membranes were agglutinated as well by...

Oxidative and hydrolytic enzymes were localized histochemically in the developing chick liver and in liver grown as chorioallantoic (CAM) transplants or as explants in organ culture. In the i n situ liver, parenchymal cells exhibited an increase in succinate (SDH) and a glycerophosphate (GDH) dehydrogenase activity and a decrease in NADP diaphorase (TPND) during development. NAD diaphorase (DPN...

Tissue invasion is an important determinant of angiogenesis and metastasis and constitutes an attractive target for cancer therapy. We have developed an assay to identify agents that inhibit invasion by mechanisms other than inhibition of cell attachment or cytotoxicity. A screen of marine sponge extracts identified motuporamines as micromolar inhibitors of invasion of basement membrane gels by...