Comparison of the toxicity of sintered and unsintered indium-tin oxide particles in murine macrophage and epidermal cells

Details

• Alternative Title:
  Toxicol Appl Pharmacol
• Personal Author:
  Olgun, Nicole S. ; Morris, Anna M. ; Barber, Tabatha Lynn ; Stefaniak, Aleksandr B. ; Kashon, Michael L. ; Schwegler-Berry, Diane ; Cummings, Kristin J. ; Leonard, Stephen S.
• Description:
  Indium-tin oxide (ITO) is used to produce flat panel displays and several other technology products. Composed of 90% indium oxide (In|O|) and 10% tin oxide (SnO|) by weight, ITO is synthesized under conditions of high heat via a process known as sintering. Indium lung disease, a recently recognized occupational illness, is characterized by pulmonary alveolar proteinosis, fibrosis, and emphysema. Murine macrophage (RAW 264.7) and epidermal (JB6) cells stably transfected with AP-1 to study tumor promoting potential, were used to differentiate between the toxicological profiles of sintered ITO (SITO) and unsintered mixture (UITO). We hypothesized that sintering would play a key role in free radical generation and cytotoxicity. Exposure of cells to both UITO and SITO caused a time and dose dependent decrease of the viability of cells. Intracellular ROS generation was inversely related to the dose of both UITO and SITO, a direct reflection of the decreased number of viable RAW 264.7 and JB6/AP-1 cells observed at higher concentrations. Electron spin resonance showed significantly increased hydroxyl radical (OH) generation in cells exposed to UITO compared to SITO. This is different from LDH release, which showed that SITO caused significantly increased damage to the cell membrane compared to UITO. Lastly, the JB6/AP-1 cell line did not show activation of the AP-1 pathway. Our results highlight both the differences in the mechanisms of cytotoxicity and the consistent adverse effects associated with UITO and SITO exposure.
• Subjects:
  Animals Article Cell Line Cell Survival DNA Damage Dose-Response Relationship, Drug Epidermis Indium Macrophages Metals Mice Occupational Health Reactive Oxygen Species Sintering Tin Compounds

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• Source:
  Toxicol Appl Pharmacol. 331:85-93
• Pubmed ID:
  28552777
• Pubmed Central ID:
  PMC6422020
• Document Type:
  Journal Article
• Funding:
  CC999999/Intramural CDC HHS/United States
• Volume:
  331
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha256:ffbda790ec098b3658fd97b4b354cbc780aed0889bad5738264c60667f5e3f26
• Download URL:
  https://stacks.cdc.gov/view/cdc/76957/cdc_76957_DS1.pdf
• File Type:
  [PDF - 1.12 MB ]