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Related Experiment Video

Updated: Dec 7, 2025

Cell Cycle-specific Measurement of γH2AX and Apoptosis After Genotoxic Stress by Flow Cytometry
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Oncogene-induced DNA damage: cyclic AMP steps into the ring.

James A Fagin1,2, John H Petrini3

  • 1Human Oncology and Pathogenesis Program.

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Summary
This summary is machine-generated.

Growth hormone-secreting pituitary tumors driven by cAMP signaling may cause DNA damage. This study reveals oncogenes induce replication stress, potentially leading to genomic instability in these tumors.

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Area of Science:

  • Endocrinology
  • Oncology
  • Molecular Biology

Background:

  • Growth hormone-secreting (GH-secreting) pituitary tumors are often driven by oncogenes activating the cAMP signaling pathway.
  • Understanding the molecular mechanisms underlying pituitary tumor development is crucial for targeted therapies.

Purpose of the Study:

  • To investigate the genomic alterations and cellular responses in GH-secreting pituitary adenomas.
  • To explore the link between cAMP signaling, DNA damage, and genomic instability in pituitary tumors.

Main Methods:

  • Whole-exome sequencing of pituitary adenomas.
  • Analysis of copy number alterations in tumor DNA.
  • Assessment of DNA damage response markers (p53, p21WAF1/CIP1) in tumors.
  • In vitro and in vivo studies using cAMP pathway agonists on mouse pituitary cells.

Main Results:

  • GH-secreting tumors exhibited frequent whole chromosome or chromosome arm copy number alterations.
  • Elevated levels of tumor protein p53 and p21WAF1/CIP1 were observed, indicating a DNA damage response.
  • Stimulation of cAMP signaling in mouse pituitary cells induced biomarkers of DNA replication stress and double-strand breaks.

Conclusions:

  • Constitutively high cAMP signaling, driven by oncoproteins, can induce DNA replication stress in pituitary cells.
  • This replication stress may contribute to the genomic instability observed in GH-secreting pituitary tumors.