Title : Exocytosis of polyubiquitinated proteins in bortezomib-resistant leukemia cells: a role for MARCKS in acquired resistance to proteasome inhibitors.

Pub. Date : 2016 Nov 15

PMID : 27542283






9 Functional Relationships(s)
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1 MARCKS upregulation was confirmed on protein level and also observed in other BTZ-resistant tumor cell lines as well as in leukemia cells with acquired resistance to other proteasome inhibitors. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens
2 Moreover, when MARCKS protein expression was demonstrated in specimens derived from therapy-refractory pediatric leukemia patients (n = 44), higher MARCKS protein expression trended (p = 0.073) towards a dismal response to BTZ-containing chemotherapy. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens
3 Moreover, when MARCKS protein expression was demonstrated in specimens derived from therapy-refractory pediatric leukemia patients (n = 44), higher MARCKS protein expression trended (p = 0.073) towards a dismal response to BTZ-containing chemotherapy. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens
4 Mechanistically, we show a BTZ concentration-dependent association of MARCKS protein levels with the emergence of ubiquitin-containing vesicles in BTZ-resistant CEM cells. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens
5 Mechanistically, we show a BTZ concentration-dependent association of MARCKS protein levels with the emergence of ubiquitin-containing vesicles in BTZ-resistant CEM cells. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens
6 Consistent with these observations, MARCKS protein associated with ubiquitin-containing vesicles was also more prominent in clinical leukemic specimen with ex vivo BTZ resistance compared to BTZ-sensitive leukemia cells. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens
7 Consistent with these observations, MARCKS protein associated with ubiquitin-containing vesicles was also more prominent in clinical leukemic specimen with ex vivo BTZ resistance compared to BTZ-sensitive leukemia cells. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens
8 Collectively, we propose a role for MARCKS in a novel mechanism of BTZ resistance via exocytosis of ubiquitinated proteins in BTZ-resistant cells leading to quenching of proteolytic stress. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens
9 Collectively, we propose a role for MARCKS in a novel mechanism of BTZ resistance via exocytosis of ubiquitinated proteins in BTZ-resistant cells leading to quenching of proteolytic stress. Bortezomib myristoylated alanine rich protein kinase C substrate Homo sapiens