Abstract:
:5-Fluorouracil (5-FU) combined with radiotherapy is a common treatment strategy to treat human cancers, but the underlying mechanisms of this combination treatment remain unclear. Here, we report that NAD+-dependent deacetylase sirtuin-7 (SIRT7) protein levels were decreased due to 5-FU exposure rendering colorectal cancer cells sensitive to radiation. We found that SIRT7 downregulation was mediated via a Tat-binding Protein 1 (TBP1) proteasome-dependent pathway. Specifically, TBP1 was dephosphorylated at tyrosine 381 upon 5-FU treatment, which enhanced its direct interaction with SIRT7 and targeted it for degradation. Depletion of SIRT7 in cultured colorectal cancer cells induced radiosensitivity triggering cell death. Interestingly, decreased levels of SIRT7 mediated by 5-FU correlated well with improved therapeutic effect in patients with rectal cancer and with inhibited tumor growth in immune-compromised mice post-irradiation. Taken together, these data suggest that 5-FU induces radiosensitivity via SIRT7 degradation to favor a cell death pathway in targeted cancer cells. Thus, downregulation of SIRT7 could be a promising pharmacologic strategy to increase the effectiveness of chemoradiation therapy in cancer patients.
journal_name
Theranosticsjournal_title
Theranosticsauthors
Tang M,Lu X,Zhang C,Du C,Cao L,Hou T,Li Z,Tu B,Cao Z,Li Y,Chen Y,Jiang L,Wang H,Wang L,Liu B,Xu X,Luo J,Wang J,Gu J,Wang H,Zhu WGdoi
10.7150/thno.18804subject
Has Abstractpub_date
2017-03-22 00:00:00pages
1346-1359issue
5issn
1838-7640pii
thnov07p1346journal_volume
7pub_type
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