Grb2 interacts with necrosome components and is involved in rasfonin-induced necroptosis

  • Cell Death Discov. 2022 Jul 13;8(1):319. doi: 10.1038/s41420-022-01106-1.
Bolin Hou  1  2 ,  Haiwen Huang  3 ,  Yueqian Li  4  5 ,  Jingnan Liang  5 ,  Zhijun Xi  3 ,  Xuejun Jiang  1 ,  Ling Liu  6 ,  Erwei Li  7  8
Affiliations
  • 1. State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.
  • 2. CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.
  • 3. Department of Urology, Peking University First Hospital, Beijing, 100034, China.
  • 4. School of Pharmacy and State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, 730000, China.
  • 5. Institutional Center for Shared Technologies and Facilities, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China.
  • 6. State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China. [email protected].
  • 7. State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China. [email protected].
  • 8. Institutional Center for Shared Technologies and Facilities, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China. [email protected].
PMID: 35831301 DOI: 10.1038/s41420-022-01106-1
Abstract

The underlying mechanism by which growth factor receptor-bound protein 2 (Grb2) regulates Necroptosis remains unexplored. In the present study, we found that rasfonin, a Fungal natural product and an activator of Necroptosis, enhanced Grb2 binding to receptor-interacting serine/threonine kinase 1 (RIP1), which plays a critical role in regulating programmed necrosis. Moreover, we observed that SQSTM/p62 (p62), a protein that can form necrosomes with RIP1, increased its interaction with Grb2 upon rasfonin challenge. Although it has been used as an activator of Autophagy in our previous study, here we found that a high dose of rasfonin was able to inhibit autophagic process. Inhibition of RIP1 either chemically or genetically reversed the inhibition of rasfonin on Autophagy, whereas knockdown of Grb2 markedly reduced rasfonin-induced necrosis. Additionally, we found that the compound failed to upregulate the expression of RIP1 in Grb2-deprived cells. In summary, our data revealed that Grb2 actively participated in rasfonin-induced Necroptosis by interacting with the components of necrosome and mediating their expression.