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ID 111724
タイトル別表記
TAK1阻害はTRAILの抗骨髄腫作用を増強するともに骨吸収促進活性を抑制活性に変換する
MODULATION OF TRAIL ACTION BY TAK1 INHIBITION
著者
天眞, 寛文 徳島大学大学院口腔科学教育部(口腔科学専攻) 徳島大学 教育研究者総覧
Oda, Asuka Tokushima University
天知, 良太 Tokushima University
Bat-Erdene, Ariunzaya Tokushima University
Iwasa, Masami Tokushima University
曽我部, 公子 Tokushima University
キーワード
Immunology
Multiple myeloma
Osteoclastgenesis
TRAIL
TAK1
資料タイプ
学位論文
抄録
Tumor necrosis factor–related apoptosis-inducing ligand (TRAIL) agonists induce tumor-specific apoptosis indicating that they may be an attractive therapeutic strategy against cancers, including multiple myeloma (MM). Osteoclastogenesis is highly induced in MM, which in turn enhances MM growth, thereby forming a vicious cycle between MM tumor expansion and bone destruction. However, the effects of TRAIL on MM-enhanced osteoclastogenesis remain largely unknown. Here, we show that TRAIL induced apoptosis in MM cells, but not in osteoclasts (OCs), and that it rather facilitated receptor activator of NF-kB ligand–induced osteoclastogenesis along with upregulation of cellular FLICE inhibitory protein (c-FLIP). TRAIL did not induce death-inducing signaling complex formation in OCs, but formed secondary complex (complex II) with the phosphorylation of transforming growth factor b–activated kinase-1 (TAK1), and thus activated NF-kB signaling. c-FLIP knockdown abolished complex II formation, thus permitting TRAIL induction of OC cell death. The TAK1 inhibitor LLZ1640-2 abrogated the TRAIL-induced c-FLIP upregulation and NF-kB activation, and triggered TRAIL-induced caspase-8 activation and cell death in OCs. Interestingly, the TRAIL-induced caspase-8 activation caused enzymatic degradation of the transcription factor Sp1 to noticeably reduce c-FLIP expression, which further sensitized OCs to TRAIL-induced apoptosis. Furthermore, the TAK1 inhibition induced antiosteoclastogenic activity by TRAIL even in cocultures with MM cells while potentiating TRAIL’s anti-MM effects. These results demonstrated that osteoclastic lineage cells use TRAIL for their differentiation and activation through tilting caspase-8–dependent apoptosis toward NF-kB activation, and that TAK1 inhibition subverts TRAIL-mediated NF-kB activation to resume TRAIL-induced apoptosis in OCs while further enhancing MM cell death in combination with TRAIL.
掲載誌名
Blood Advances
ISSN
24739529
24739537
出版者
The American Society of Hematology
1
24
開始ページ
2124
終了ページ
2137
発行日
2017-10-26
備考
内容要旨・審査要旨・論文本文の公開
本論文は, 著者Hirofumi Tenshinの学位論文として提出され, 学位審査・授与の対象となっている。
EDB ID
出版社版DOI
出版社版URL
フルテキストファイル
言語
eng
著者版フラグ
博士論文全文を含む
文科省報告番号
甲第3175号
学位記番号
甲口第432号
学位授与年月日
2018-03-23
学位名
博士(歯学)
学位授与機関
徳島大学
部局
歯学系
病院
医学系
先端酵素学研究所