Chromosomal anomalies in radiation-induced fibrosis in the pig. |
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Authors: | L Sabatier M Martin F Crechet P Pinton B Dutrillaux |
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Institution: | Laboratoire de Cytogénétique et Génétique, DPTE/DSV CEN-FAR, Fontenay-aux-Roses, France. |
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Abstract: | R-banded karyotypes were established on fibroblasts from fibrotic tissues derived from experimental fibrosis induced in pigs, either surgically or by 64 Gy of gamma-rays from iridium-192. No chromosome aberrations were observed in the surgical fibrosis. In radiation-induced fibrosis, the high frequency of abnormal karyotypes and the frequent complexity of the chromosomal rearrangements suggest that the fibroblasts originated either from the 64-Gy area, or from the penumbra, but certainly not from non-irradiated areas. At early passages in vitro, almost all karyotypes were different, demonstrating a multiclonal origin of fibrotic tissue. At late passages (above 24), the situation was quite different, with the persistence of one or two clones only, demonstrating a strong selective pressure occurring in vitro. |
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