Deficient Tyrosine Phosphorylation of c-Cbl and Associated Proteins in Phorbol Ester-resistant EL4 Mouse Thymoma Cells
نویسندگان
چکیده
منابع مشابه
Effects of protein kinase C activators on phorbol ester-sensitive and -resistant EL4 thymoma cells.
Phorbol ester-sensitive EL4 murine thymoma cells respond to phorbol 12-myristate 13-acetate with activation of ERK mitogen-activated protein kinases, synthesis of interleukin-2, and death, whereas phorbol ester-resistant variants of this cell line do not exhibit these responses. Additional aspects of the resistant phenotype were examined, using a newly-established resistant cell line. Phorbol e...
متن کاملActivation of messenger-independent protein kinases in wild-type and phorbol ester-resistant EL4 thymoma cells.
Phorbol esters, acting via activation of the protein kinase C family of protein serine/threonine kinases, are able to exert profound effects on various cellular functions. In this study, we used the EL4 thymoma cell line to study the potential role of "downstream" protein serine/threonine kinases in cellular responses to phorbol esters. In wild-type EL4 cells, addition of phorbol ester caused a...
متن کاملIdentification of high-affinity phorbol ester receptor in cytosol of EL4 thymoma cells: requirement for calcium, magnesium, and phospholipids.
A specific high-affinity phorbol ester binding component has been identified in the cytosol of an EL4 mouse thymoma line by using conditions similar to those for demonstrating activity of a calcium/phospholipid-dependent protein kinase. Specific binding is absolutely dependent on acidic phospholipids (maximal binding at 96 micrograms of phosphatidylserine per ml or 200 micrograms of phosphatidy...
متن کاملAbsence of protein kinase C in nuclei of EL4 mouse thymoma cells.
Since evidence indicates that phorbol ester-induced production of interleukin 2 requires transcription, we investigated the possibility that the phorbol ester receptor acts directly in the nuclei of EL4 thymoma cells. Using a procedure that minimized plasma membrane contamination (as measured by 5'-nucleotidase activity) and maintained the integrity of the double nuclear membrane, we were unabl...
متن کاملEffects of phorbol ester on tyrosine hydroxylase phosphorylation and activation in cultured bovine adrenal chromaffin cells.
The phorbol ester 12-O-tetradecanoylphorbol 13-acetate (TPA) caused phosphorylation of phosphoproteins of 56-kDa which co-migrated with and had identical pI values to subunits of tyrosine hydroxylase. The phosphorylation was closely correlated with an increase of [3H]3,4-dihydroxyphenylalanine (DOPA) production which is a reflection of increased tyrosine hydroxylase activity. Only those phorbol...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1997
ISSN: 0021-9258
DOI: 10.1074/jbc.272.18.12221