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Sigma receptors are expressed in human non-small cell lung carcinoma

C S John1, W D Bowen, V M Varma

  • 1Department of Radiology, George Washington University Medical Center, Washington, DC 20037, USA.

Life Sciences
|January 1, 1995
PubMed

Insights

N-(2-piperidinoethyl)4-iodobenzamide (IPAB) can identify sigma receptors on non-small cell lung cancer (NSCLC) cells. These receptors show potential as imaging markers for visualizing NSCLC tumors in vivo.

Area of Science:

  • Oncology
  • Radiochemistry
  • Molecular Imaging

Background:

  • Sigma receptors are implicated in various cellular processes.
  • Their role in non-small cell lung cancer (NSCLC) requires further elucidation.
  • Targeted imaging agents are crucial for early cancer detection.

Purpose of the Study:

  • To characterize sigma receptors in NSCLC cell lines using N-(2-piperidinoethyl)4-iodobenzamide (IPAB).
  • To evaluate the potential of IPAB as an imaging biomarker for NSCLC.

Main Methods:

  • Radioligand binding assays using 125IPAB on NSCLC cell lines (NCI-H1299, NCI-H838, NCI-H727).
  • Inhibition studies with known sigma receptor ligands (haloperidol, DTG).
  • In vivo scintigraphic imaging of NCI-H838 xenografts in nude mice using 131IPAB.

Main Results:

  • 125IPAB demonstrated high-affinity binding to NSCLC cell lines.
  • Specific binding was confirmed by inhibition studies.
  • 131IPAB successfully visualized NSCLC tumors in vivo at 24-30 hours post-injection.

Conclusions:

  • Sigma receptors are present on NSCLC cells.
  • IPAB exhibits characteristics suitable for sigma receptor imaging.
  • Sigma receptors may serve as valuable external markers for NSCLC tumor imaging.

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