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2017 ; 7
(1
): 10607
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Hyper-O-GlcNAcylation induces cisplatin resistance via regulation of p53 and
c-Myc in human lung carcinoma
#MMPMID28878262
Luanpitpong S
; Angsutararux P
; Samart P
; Chanthra N
; Chanvorachote P
; Issaragrisil S
Sci Rep
2017[Sep]; 7
(1
): 10607
PMID28878262
show ga
Aberrant metabolism in hexosamine biosynthetic pathway (HBP) has been observed in
several cancers, affecting cellular signaling and tumor progression. However, the
role of O-GlcNAcylation, a post-translational modification through HBP flux, in
apoptosis remains unclear. Here, we found that hyper-O-GlcNAcylation in lung
carcinoma cells by O-GlcNAcase inhibition renders the cells to apoptosis
resistance to cisplatin (CDDP). Profiling of various key regulatory proteins
revealed an implication of either p53 or c-Myc in the apoptosis regulation by
O-GlcNAcylation, independent of p53 status. Using co-immunoprecipitation and
correlation analyses, we found that O-GlcNAcylation of p53 under certain cellular
contexts, i.e. high p53 activation, promotes its ubiquitin-mediated proteasomal
degradation, resulting in a gain of oncogenic and anti-apoptotic functions. By
contrast, O-GlcNAcylation of c-Myc inhibits its ubiquitination and subsequent
proteasomal degradation. Gene manipulation studies revealed that O-GlcNAcylation
of p53/c-Myc is in part a regulator of CDDP-induced apoptosis. Accordingly, we
classified CDDP resistance by hyper-O-GlcNAcylation in lung carcinoma cells as
either p53 or c-Myc dependence based on their molecular targets. Together, our
findings provide novel mechanisms for the regulation of lung cancer cell
apoptosis that could be important in understanding clinical drug resistance and
suggest O-GlcNAcylation as a potential target for cancer therapy.