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Receptor‐Interacting Protein Kinase 3 (RIPK3) inhibits autophagic flux during necroptosis in intestinal epithelial cells
FEBS Letters ( IF 3.0 ) Pub Date : 2020-02-16 , DOI: 10.1002/1873-3468.13748
Kana Otsubo 1 , Chiaki Maeyashiki 1 , Yoichi Nibe 1 , Akiko Tamura 1 , Emi Aonuma 1 , Hiroki Matsuda 1 , Masanori Kobayashi 1 , Michio Onizawa 1 , Yasuhiro Nemoto 1 , Takashi Nagaishi 2 , Ryuichi Okamoto 3 , Kiichiro Tsuchiya 1 , Tetsuya Nakamura 4 , Satoru Torii 5 , Eisuke Itakura 6 , Mamoru Watanabe 1, 7 , Shigeru Oshima 1
Affiliation  

Autophagy is an intracellular process that regulates the degradation of cytosolic proteins and organelles. Dying cells often accumulate autophagosomes. However, the mechanisms by which necroptotic stimulation induces autophagosomes are not defined. Here, we demonstrate that the activation of necroptosis with TNF‐α plus the cell‐permeable pan‐caspase inhibitor Z‐VAD induces LC3‐II and LC3 puncta, markers of autophagosomes, via the receptor‐interacting protein kinase 3 (RIPK3) in intestinal epithelial cells. Surprisingly, necroptotic stimulation reduces autophagic activity, as evidenced by enlarged puncta of the autophagic substrate SQSTM1/p62 and its increased colocalization with LC3. However, necroptotic stimulation does not induce the lysosomal‐associated membrane protein 1 (LAMP1) nor syntaxin 17, which mediates autophagosome–lysosome fusion, to colocalize with LC3. These data indicate that necroptosis attenuates autophagic flux before the lysosome fusion step. Our findings may provide insights into human diseases involving necroptosis.

中文翻译:

受体相互作用蛋白激酶3(RIPK3)抑制肠上皮细胞坏死性凋亡过程中的自噬流

自噬是一种调节细胞质蛋白和细胞器降解的细胞内过程。垂死的细胞通常会积累自噬体。然而,坏死性刺激诱导自噬体的机制尚未明确。在这里,我们证明了用 TNF-α 和细胞渗透性泛半胱天冬酶抑制剂 Z-VAD 激活坏死性凋亡通过肠道中的受体相互作用蛋白激酶 3(RIPK3)诱导 LC3-II 和 LC3 斑点,自噬体的标志物。上皮细胞。令人惊讶的是,坏死性凋亡刺激降低了自噬活性,这可以通过自噬底物 SQSTM1/p62 的点扩大及其与 LC3 的共定位增加来证明。然而,坏死性凋亡刺激不会诱导溶酶体相关膜蛋白 1 (LAMP1) 也不会诱导介导自噬体-溶酶体融合的突触蛋白 17,与 LC3 共定位。这些数据表明,在溶酶体融合步骤之前,坏死性凋亡减弱了自噬通量。我们的研究结果可能为涉及坏死性凋亡的人类疾病提供见解。
更新日期:2020-02-16
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