The tsBN7 cell line is one of the temperature-sensitive mutants for cell proliferation derived from hamster BHK21 cell line. It has a mutation in the DAD1 gene and enters apoptosis at the restrictive temperature of 39°C. The defect of Dad1p causes a loss of N-linked glycosylation; therefore, it was thought that an inhibition of N-linked glycosylation induced apoptosis. However, tunicamycin, a potent inhibitor of N-linked glycosylation, had not caused apoptosis in wild-type BHK21 cells. In order to clarify this discrepancy, wild-type BHK21 cells treated with tunicamycin and tsBN7 cells incubated at 39.5°C were examined by the annexin V staining and TUNEL methods. Both methods showed that tunicamycin induces apoptosis in wild-type BHK21 cells, similar to the defect of Dadlp. Thus, we concluded that loss of N-linked glycosylation causes apoptosis. (C) 2000 Academic Press.
|Number of pages||5|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - Oct 5 2000|
All Science Journal Classification (ASJC) codes
- Molecular Biology
- Cell Biology