Progranulin is required for proper ER stress response and inhibits ER stress-mediated apoptosis through TNFR2
| Autor: | Zhi-meng Wu, Yanna Liu, Li Deng, Fei Xia, Rong Jiang, Meiling Li, Feng-Jin Guo |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
medicine.medical_specialty
Apoptosis law.invention Mice Progranulins law Internal medicine medicine Extracellular Animals Receptors Tumor Necrosis Factor Type II Extracellular Signal-Regulated MAP Kinases Protein kinase B Cells Cultured Granulins Mice Knockout ER stress response Chemistry Endoplasmic reticulum Cell Biology Hypoxia (medical) Endoplasmic Reticulum Stress Protein Structure Tertiary Up-Regulation Cell biology Enzyme Activation Endocrinology Receptors Tumor Necrosis Factor Type I Unfolded protein response Recombinant DNA Intercellular Signaling Peptides and Proteins Female medicine.symptom Proto-Oncogene Proteins c-akt Protein Binding |
| Zdroj: | Cellular Signalling. 26:1539-1548 |
| ISSN: | 0898-6568 |
| DOI: | 10.1016/j.cellsig.2014.03.026 |
| Popis: | Progranulin (PGRN) was reported to be a stress-response factor in response to hypoxia and acidosis. Here we present evidences demonstrating that PGRN is also an endoplasmic reticulum (ER) stress responsive factor: PGRN expression was induced and its activation of Erk1/2 and Akt signaling enhanced in response to ER stress; Normal ER stress response was lost in PGRN deficient cells and PGRN deficient cells became hypersusceptible to ER stress-induced apoptosis; additionally, recombinant PGRN could rescue the defects in ER-stress responses seen in PGRN deficient cells. Mechanistic studies indicated that PGRN/TNFR2 was critical for PGRN mediated regulation of ER stress response: similar to PGRN, the expression of TNFR2, but not TNFR1, was also induced in the course of ER stress; in addition, the association between PGRN and TNFR2 was markedly enhanced following ER stress; More importantly, PGRN protection of ER stress induced apoptosis was abolished when TNFR2 signaling was blocked. In addition, the 2nd and 3rd cysteine-rich domains (CRD) in the extracellular portion of TNFR2 (CRD2CRD3), known to directly bind to PGRN, disturbed the interaction of PGRN with TNFR2, and in turn abolished PGRN-mediated activation of Erk1/2 and Akt signaling and protection against apoptosis in response to ER-stress. Collectively, PGRN plays an important role in ER stress and regulates ER stress response through interacting with TNFR2. This study provides new insight into PGRN regulation of stress response and may also present PGRN as a potential molecular target for treating stress-associated disorders. |
| Databáze: | OpenAIRE |
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