Exploration of Matrix Effects in Laser Ablation Inductively Coupled Plasma Mass Spectrometry Imaging of Cisplatin-Treated Tumors

Anal Chem. 2020 Jul 21;92(14):9847-9855. doi: 10.1021/acs.analchem.0c01347. Epub 2020 Jul 1.

Abstract

The use of a low aerosol dispersion ablation chamber within a laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS) setup allows for high-resolution, high-speed imaging of the distribution of elements within a sample. Here we show how this enhanced capability creates new analytical problems and solutions. We report the distribution of platinum at the cellular level in non-small cell lung cancer (NSCLC) explant models after treatment with clinically relevant doses of cisplatin. This revealed for the first time a correlation between the platinum signal and the presence of carbon deposits within lung tissue. We show how complementary ion beam analysis techniques, particle-induced X-ray emission (PIXE) and elastic backscattering spectrometry (EBS), can be used to explore potential matrix effects in LA-ICP-MS data. For these samples, it was confirmed that the enhancement was unlikely to have resulted from a matrix effect alone. Thus, the presence of carbon deposits within tissue has potential implications for the effective distribution of the cisplatin drug.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents / therapeutic use
  • Carbon / chemistry
  • Carcinoma, Non-Small-Cell Lung
  • Cisplatin / therapeutic use*
  • Humans
  • Laser Therapy
  • Lung Neoplasms / chemistry*
  • Lung Neoplasms / drug therapy*
  • Mass Spectrometry / methods*
  • Spheroids, Cellular
  • Tissue Culture Techniques

Substances

  • Antineoplastic Agents
  • Carbon
  • Cisplatin