Variants of Hamster Fibroblasts Resistant to Ricinus Communis Toxin (ricin)

Overview

Journal Biochem J

Specialty Biochemistry

Date 1976 Jan 15

PMID 1275903

Citations 12

Authors

A Meager

A Ungkitchanukit

R C Hughes

Affiliations

Soon will be listed here.

Abstract

1. Variant baby-hamster kidney (BHK) cell lines were isolated that grow in the presence of high concentrations of ricin, the toxic lectin of castor beans (Ricinus communis). The variant lines were independently derived from several cultures of normal BHK cells which had been exposed to the mutagen, methyl-N-nitro-N-nitrosoguanidine, before selection by ricin. 2. The cell lines maintain a high degree of resistance to ricin after growth in lectin-free medium for prolonged periods and therefore exhibit stable phenotypes that are different from normal BHK cells. 3. A preliminary classification of the phenotypes was made. Several cell lines bind normal amounts of 125I-labelled ricin, whereas other bind the lectin poorly. 4. A loss of surface receptors for two other lectins, R. communis RCA and Axinella polyploides, which have specificities similar to ricin, was also found in some but not all of the cell lines showing decreased surface concentrations of ricin receptors. 5. The binding to the ricin-resistant cells of lectins of different sugar specificity, namely Lens culinaris lectin and concanavalin A, was similar to, or higher than, to normal BHK cells. 6. Several of the ricin-resistant cell lines were shown to be cross-resistant to the weak cytotoxicity of Phaseolus vulgaris lectin. By contrast, some cell lines were more sensitive to concanavalin A than were normal BHK cells.

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