Abstract:
:The transferrin receptor (TfR) was recently proposed as putative natural killer (NK) cell target structure. Here data are presented against this hypothesis and it is shown that low TfR expression and high NK sensitivity can occur concommitantly . K562 cells were studied at various stages of cell proliferation. No change in NK sensitivity could be observed between exponential growth and the plateau phase, whereas TfR expression completely disappeared during the latter. Protein synthesis inhibitors such as cycloheximide (1 microgram/ml, 48 h) and actinomycin D (50 micrograms/ml, 48 h), that abolished the TfR expression at the K562 cell surface, had no effect on NK sensitivity. Similarly, hemin induction (0.1 mM, 5 days) did not change NK susceptibility of K562 cells but considerably diminished TfR expression. Moreover, attempts to block NK sensitivity with anti-TfR monoclonal antibodies were unsuccessful, even when the 42.6 antibody, which is known to bind to the active site of TfR, was used. Finally, no blocking of NK sensitivity could be achieved when K562 cells were preincubated with saturating concentrations of transferrin or when transferrin was added during the NK assay. It therefore seems doubtful that TfR is the unique target structure for NK cells. It remains possible that TfR and NK target structures are often coexpressed on actively dividing cells.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Dokhélar MC,Garson D,Testa U,Tursz Tdoi
10.1002/eji.1830140412subject
Has Abstractpub_date
1984-04-01 00:00:00pages
340-4issue
4eissn
0014-2980issn
1521-4141journal_volume
14pub_type
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830080703
更新日期:1978-07-01 00:00:00
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更新日期:2012-10-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
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journal_title:European journal of immunology
pub_type: 杂志文章
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journal_title:European journal of immunology
pub_type: 杂志文章
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journal_title:European journal of immunology
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journal_title:European journal of immunology
pub_type: 杂志文章
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更新日期:1988-05-01 00:00:00
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journal_title:European journal of immunology
pub_type: 杂志文章
doi:10.1002/eji.1830200436
更新日期:1990-04-01 00:00:00
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更新日期:2008-07-01 00:00:00