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Updated: Sep 11, 2025

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy

Published on: August 14, 2012

Radioresistant mouse pheochromocytoma cell lines.

Sandy Lemm^1,2, Marcel Gebhardt³, Thomas Groß⁴

¹Institute of Radiopharmaceutical Cancer Research, Department of Radiopharmaceutical and Chemical Biology, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany.

Frontiers in Oncology

|August 14, 2025

Summary

This summary is machine-generated.

New mouse models of metastatic pheochromocytoma/paraganglioma (PCC/PGL) were developed to study radioresistance. These models show increased DNA repair and resistance to X-ray treatment, aiding research into treatment failure.

Keywords:

HIF-2α X-ray irradiation paraganglioma pheochromocytoma pseudohypoxia radioresistance

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Area of Science:

Oncology
Radiation Biology
Genetics

Background:

Metastatic pheochromocytoma/paraganglioma (PCC/PGL) presents limited therapeutic options.
Peptide receptor radionuclide therapy (PRRT) can sometimes lead to metastatic eruption, suggesting radioresistant tumor cell phenotypes.
The mechanisms of radioresistance in PCC/PGL are poorly understood, and suitable experimental models are lacking.

Purpose of the Study:

To establish novel preclinical models of radioresistant pheochromocytoma/paraganglioma (PCC/PGL).
To investigate the impact of hypoxia-inducible factor 2α (HIF-2α) on radioresistance development in PCC/PGL.
To characterize DNA repair capacity and morphological changes in response to fractionated irradiation.

Main Methods:

Two genetically modified mouse pheochromocytoma (MPC) cell lines, differing in HIF-2α expression (MPC+HIF-2α and MPC+EV), were subjected to fractionated X-ray irradiation.
Two irradiation protocols were employed: recovery between fractions (recIR) and daily irradiation (dayIR).
Changes in cell morphology, growth rate, and DNA repair marker (γH2AX) were assessed.

Main Results:

MPC cell lines were conditioned to tolerate fractionated X-ray doses up to 2 Gy/day without significant growth inhibition.
Conditioned cell lines exhibited enhanced DNA repair capacity.
MPC+HIF-2α cells demonstrated the highest increase in radioresistance, tolerating up to 5 Gy/day.
Daily irradiation (dayIR) induced more pronounced morphological changes (clustering, slower growth) compared to recovery irradiation (recIR).

Conclusions:

Established X-ray-conditioned MPC cell lines serve as valuable models for studying radioresistant PCC/PGL.
These models will facilitate further research into the mechanisms of acquired radioresistance and PRRT-induced metastasis.
The models can be utilized to test advanced PRRT and complementary therapies for improved theranostic strategies.