Journal
JOURNAL OF NEUROINFLAMMATION
Volume 17, Issue 1, Pages -Publisher
BMC
DOI: 10.1186/s12974-020-01963-6
Keywords
Neurodegenerative disease; Neuroinflammation; Astrocytes; Tar DNA-binding protein 43; Protein tyrosine phosphatase 1B
Categories
Funding
- KBRI Research Program of the Ministry of Science, ICT & Future Planning [20-BR-02-08]
- Soonchunhyang University Research Fund
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2020R1A2C4002366, NRF-2019R1F1A1045639, NRF2020R1F1A1058459]
- Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI) - Ministry of Health and Welfare, South Korea [HI14C1135, HI18C1241]
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Background Cytoplasmic inclusions of transactive response DNA binding protein of 43 kDa (TDP-43) in neurons and astrocytes are a feature of some neurodegenerative diseases, such as frontotemporal lobar degeneration with TDP-43 (FTLD-TDP) and amyotrophic lateral sclerosis (ALS). However, the role of TDP-43 in astrocyte pathology remains largely unknown. Methods To investigate whether TDP-43 overexpression in primary astrocytes could induce inflammation, we transfected primary astrocytes with plasmids encodingGfporTDP-43-Gfp. The inflammatory response and upregulation of PTP1B in transfected cells were examined using quantitative RT-PCR and immunoblot analysis. Neurotoxicity was analysed in a transwell coculture system of primary cortical neurons with astrocytes and cultured neurons treated with astrocyte-conditioned medium (ACM). We also examined the lifespan, performed climbing assays and analysed immunohistochemical data in pan-glial TDP-43-expressing flies in the presence or absence of aPtp61fRNAi transgene. Results PTP1B inhibition suppressed TDP-43-induced secretion of inflammatory cytokines (interleukin 1 beta (IL-1 beta), interleukin 6 (IL-6) and tumour necrosis factor alpha (TNF-alpha)) in primary astrocytes. Using a neuron-astrocyte coculture system and astrocyte-conditioned media treatment, we demonstrated that PTP1B inhibition attenuated neuronal death and mitochondrial dysfunction caused by overexpression of TDP-43 in astrocytes. In addition, neuromuscular junction (NMJ) defects, a shortened lifespan, inflammation and climbing defects caused by pan-glial overexpression of TDP-43 were significantly rescued by downregulation ofptp61f(theDrosophilahomologue of PTP1B) in flies. Conclusions These results indicate that PTP1B inhibition mitigates the neuronal toxicity caused by TDP-43-induced inflammation in mammalian astrocytes andDrosophilaglial cells.
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