The c-K-ras 2 gene mutations were examined in colorectal tumours from patients with synchronous or metachronous tumours in order to investigate tumorigenesis. Sixty-seven colorectal carcinomas from patients with a single lesion, 50 from patients with synchronous lesions, and 12 from patients with metachronous lesions were analysed for the presence of point mutations in codons 12 and 13 of c-K-ras proto-oncogene. In the patients with metachronous or synchronous lesions, the finding of the mutation in one tumour was not associated with a greater frequency of the mutation in other carcinomas from the same patient. In the patients with tumours that each contained the mutation, the mutations were not always the same. In tumours from the patients with original and synchronous lesions, the mutation frequency was significantly lower in advanced carcinomas invading through the entire muscularis propria (10.5%) than in early carcinomas confined to the mucosa (47.8%), and the mutation frequency in carcinomas invading through the entire muscularis propria was significantly lower in patients with synchronous lesions (10.5%) than in patients with a single lesion (37.7%). These results suggest that the tumorigenesis of colorectal carcinomas from patients with synchronous lesions is different from that in patients with a single lesion.

Adult↗

PubMedDate not supplied

Phosphomannosyl receptor in bovine and human tissues determined by a sensitive radioimmunoassay method.

A highly sensitive radioimmunoassay method has been established for the phosphomannosyl receptor using an antibody to the bovine receptor. The amount of the receptor in extracts from total membrane fractions varied remarkably in different tissues and species. The amount in liver was the highest and that in brain was the lowest among bovine tissues. Human tissues contained significant amounts of material cross-reacting to the antibody, the highest in spleen and the lowest in kidney. The physiological significance of the receptor is discussed in terms of the intracellular transport of lysosomal enzymes in human tissues.

Animals↗