Abstract
In order to reveal cellular processes sensitive to abnormal c-myb expression in vivo, transgenic mice were produced by introducing the c-myb nuclear proto-oncogene under the ubiquitous transcriptional regulatory unit of the cytoplasmic beta-actin gene. Expression of c-myb in thymus did not cause apparent abnormality, but the mice unexpectedly developed degenerative abnormalities in skeletal and cardiac muscles; this occurred predominantly in males. Expression of c-myb in skeletal muscle was correlated with an inflammation of muscle and was accompanied by vacuolar degeneration of muscle fibres, their regeneration, and lymphocyte infiltration. The identical pathological progression in cardiac muscle was associated with cardiomegaly.
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