Identification of rabbit and mouse beta-glucuronidases in human fibroblasts following direct interaction with lymphocytes.
Human fibroblasts totally deficient in beta-glucuronidase acquired high levels of enzyme activity when co-cultured with mouse or rabbit lymphocytes. Direct cell-to-cell contact was obligatory for this process. The enzyme acquired by the fibroblasts was shown to be identical to beta-glucuronidase from donor lymphocytes by its position of elution from DEAE-cellulose, thermal stability, mobility on polyacrylamide gels and by its antigenic determinants. The enzyme extracted from deficient fibroblasts after co-culture with lymphocytes showed no evidence of any hybridisation between human and mouse or rabbit sub-units. It is concluded that during direct cell interaction, enzymically active beta-glucuronidase is transferred directly from donor lymphocytes to deficient fibroblasts by a mechanism, previously shown not to involve normal receptor mediated endocytosis.
D000818:Animals; D002450:Cell Communication; D002478:Cells, Cultured; D005347:Fibroblasts / Q000201:enzymology*; D005966:Glucuronidase / Q000172:deficiency / Q000302:isolation & purification / Q000378:metabolism*; D006358:Hot Temperature; D006801:Humans; D008214:Lymphocytes / Q000201:enzymology*; D051379:Mice; D008815:Mice, Inbred Strains; D011817:Rabbits; D013045:Species Specificity
D005966:Glucuronidase