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A modified chorioallantoic membrane (CAM) assay for qualitative and quantitative study of growth factors

Studies on the effects of carriers, PBS, angiogenin, and bFGF

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Summary

The application of Thermanox tissue culture coverslips to the day 9 CAM of the chick causes constant effects beneath the carrier after 3 days, and these are associated with a change in the blood vessel pattern. Histological sections show enormous thickening of the CAM in the reactive areas. The stroma of the CAM shows fibrocyte proliferation, leucocyte infiltration, and clusters of dispersed ectodermal epithelial cells exhibiting signs of necrosis. The latter obviously cause a strong vascular response. The same effects are seen when the Thermanox discs are applied at day 11. Following application on day 12 a positive or negative response to the carrier is observed, whereas on day 13 no such carrier effects are seen. The only remaining effect is compression of the intra-ectodermal capillary plexus of the CAM. This can macroscopically be seen after peroxidase staining of the blood vessels. The effect of 5 μl PBS dried on the Thermanox disc and applied to the day 13 CAM is to cause, after 3 days, hyperosmotic damage to the ectodermal epithelium, which becomes overgrown by fibrocytes. We found dose-dependent effects of salt-free human bFGF applied to the day 13 CAM. The first and main effect is fibrocyte proliferation (0.5 μg). New capillaries appear with higher doses, but are not as frequent as would be expected for an angiogenic substance (1.25–2.5 μg). Also with higher doses additional hyperplasia of the endodermal (3.75 μg) and ectodermal (5 μg) epithelium can be seen. The latter might be a non-specific hyperosmotic effect. Leucocytes are regularly present within the reactive areas. When salt-free angiogenin is applied to the day 13 CAM, some effects appear with doses of 4.6 μg and more. The ectodermal epithelium of the reactive areas is discontinuous, exhibiting signs of necrosis. It is overgrown by parallel fibrocytes. Whether this is a non-specific hyperosmotic effect, or indicates enhancement of invasive growth, calls for further investigation.

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Authors and Affiliations

  1. Anatomisches Institut der Albert-Ludwigs-Universität Freiburg i.Br., Lehrstuhl II, Albertstrasse 17, W-7800, Freiburg, Federal Republic of Germany

    Jörg Wilting & Bodo Christ

  2. Institut für Anatomie der Ruhr-Universität Bochum, Abteilung für Anatomie und Embryologie, Universitätsstrasse 150, W-4630, 1, Bochum, Federal Republic of Germany

    Matthias Bokeloh

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  1. Jörg Wilting
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  2. Bodo Christ
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  3. Matthias Bokeloh
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Wilting, J., Christ, B. & Bokeloh, M. A modified chorioallantoic membrane (CAM) assay for qualitative and quantitative study of growth factors. Anat Embryol 183, 259–271 (1991). https://doi.org/10.1007/BF00192214

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