Cited by 35Autophagy in Disease and TherapyNeonatal Health and BiochemistryEndoplasmic Reticulum Stress and Disease

The activation of autophagy protects neurons and astrocytes against bilirubin-induced cytotoxicity

Qaisiya, Mohammed, Mardešić, Paula, Pastore, Beatrice, Tiribelli, Claudio, Bellarosa, Cristina·2017·Neuroscience Letters

Abstract

Unconjugated bilirubin (UCB) neurotoxicity involves oxidative stress, calcium signaling and ER-stress. The same insults can also induce autophagy, a process of "self-eating", with both a pro-survival or a pro-apoptotic role. Our aim was to study the outcome of autophagy activation by UCB in the highly sensitive neuronal SH-SY5Y cells and in the resistant astrocytoma U87 cells. Upon treatment with a toxic dose of UCB, the conversion of LC3-I to LC3-II was detected in both cell lines. Inhibition of autophagy by E64d before UCB treatment increased SH-SY5Y cell mortality and made U87 cells sensitive to UCB. In SH-SY5Y autophagy related genes ATG8 (5 folds), ATG18 (5 folds), p62 (3 folds) and FAM 129A (4.5 folds) were induced 8h after UCB treatment while DDIT4 upregulation (13 folds) started at 4h. mTORC1 inactivation by UCB was confirmed by phosphorylation of 4EBP1. UCB induced LC3-II conversion was completely prevented by pretreating cells with the calcium chelator BAPTA and reduced by 65% using the ER-stress inhibitor 4-PBA. Pretreatment with the PKC inhibitor reduced LC3 mRNA by 70% as compared to cells exposed to UCB alone. Finally, autophagy induction by Trifluoroperazine (TFP) increased the cell viability of rat hippocampal primary neurons upon UCB treatment from 60% to 80%. In SH-SY5Y cells, TFP pretreatment blocked the UCB-induced cleaved caspase-3 protein expression, decreased LDH release from 50% to 23%, reduced the UCB-induction of HO1, CHOP and IL-8 mRNAs by 85%, 70% and 97%. Collectively these data indicate that the activation of autophagy protects neuronal cells from UCB cytotoxicity. The mechanisms of autophagy activation by UCB involves mTOR/ER-stress/PKC/calcium signaling.

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Crossref · 10.1016/j.neulet.2017.09.056

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  • Autophagy proteins have been shown to impact the clearance of protein aggregates in neurons, most likely by canonical aggrephagy.

    “While autophagy proteins have been shown to impact the clearance of protein aggregates in neurons, most likely by the canonical autophagic process of aggrephagy (Frake et al., 2015; Menzies et al., 2017; Qaisiya et al., 2017; Sarkar et al., 2007; Sarkar et al., 2009; Webb et al., 2003; Yamamoto and Simonsen, 2011), effects in microglia of the CNS are more likely due to LANDO.”

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Authors
Qaisiya, M., Mardešić, P., Pastore, B., Tiribelli, C., & Bellarosa, C.
Affiliations
  • Hebron University (PS)
  • Fondazione Italiana Fegato (IT)
  • Scuola Internazionale Superiore di Studi Avanzati (IT)
Corresponding author
Bellarosa, Cristina
Venue
Neuroscience Letters
Publisher
Elsevier BV
Published
2017-11
Volume
661
Pages
96-103
ISSN
0304-3940 (ISSN-L)
OpenAlex
W2758629344
Cited by
35
References
47
Citations by year
2026: 6 · 2025: 3 · 2024: 4 · 2023: 5 · 2022: 4 · 2021: 4 · 2020: 4 · 2019: 5
FWCI
1.94
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience Letters (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • AREA Science Park
  • Fondazione Italiana Fegato, ONLUS
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Neonatal Health and Biochemistry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
Keywords
autophagy, unconjugated bilirubin, bilirubin neurotoxicity, neuroprotection, astrocytes, LC3 conversion, mTOR signaling, endoplasmic reticulum stress, calcium signaling, protein kinase C, oxidative stress, apoptosis, caspase-3, SH-SY5Y cells, U87 cells, hippocampal neurons, DDIT4, CHOP, interleukin-8, hepatorenal syndrome
MeSH terms
Astrocytes, Autophagy, Bilirubin, Cell Survival, Humans, Neurons, Signal Transduction, Apoptosis, Cell Line, Tumor, TOR Serine-Threonine Kinases

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