Brain metastasis model in athymic nude mice using a novel MUC1-secreting human breast-cancer cell line, MA11

International Journal of Cancer. Journal International Du Cancer
P D RyeOystein Fodstad

Abstract

The MA11 human breast-cancer cell line was established with cells isolated from a bone-marrow sample using immunomagnetic beads conjugated to the anti-MUC1 antibody BM-2. The cell line showed a selective preference for metastasising to the brain in athymic nude mice. Following injection of MA11 cells into the left ventricle of the heart, brain metastases developed in 87% (20/23) animals, with a mean latency until development of neurological symptoms of 65 days. Necropsy and histological examination revealed tumour nodules of varying sizes throughout the brain, invading both grey and white matter of both hemispheres, and with extensive involvement of the cerebellum. MRI spin-echo images indicated brain lesions in some animals that were subsequently confirmed by histology. Three mice showed small tumour nodules (1-2 mm) in the lung, and 2 had solitary lesions (< 1 mm) within the spinal cord. Metastases were not detected in bone, liver, adrenal gland, kidney, spleen or heart. The human MUC1 mucin, as determined by a europium-based immunoradiometric assay, was detected in the serum of 9/11 animals that showed histological evidence of brain metastases. The mucin could not be found in mouse serum samples taken before day 46. The conc...Continue Reading

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