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Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
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CDKN2A (p16INK4A) affects the anti‑tumor effect of CDK inhibitor in somatotroph adenomas

Yiyuan Chen1, Zhenye Li2, Qiuyue Fang1

  • 1Department of Cell Biology, Beijing Neurosurgical Institute, Capital Medical University, Beijing 100070, P.R. China.

International Journal of Molecular Medicine
|January 8, 2021
PubMed

Insights

The INK4 family, specifically CDKN2A, plays a role in somatotroph adenoma. High CDKN2A levels predict resistance to palbociclib, a CDK4 inhibitor, in acromegaly treatment.

Area of Science:

  • Endocrinology
  • Oncology
  • Molecular Biology

Background:

  • Acromegaly stems from aberrant growth factor signaling in somatotroph adenomas, affecting cell cycle regulation.
  • The INK4 family's role in somatotroph adenoma pathogenesis and response to targeted therapy remains under investigation.

Purpose of the Study:

  • To explore the pathological role of the INK4 family in somatotroph adenoma.
  • To assess the efficacy of the CDK4 inhibitor palbociclib in somatotroph adenoma models.

Main Methods:

  • RNA-Seq, RT-PCR, and immunohistochemistry were used to analyze gene expression and correlations.
  • Cell proliferation, cell cycle, and hormone secretion were measured using MTS, flow cytometry, and ELISA in response to palbociclib.

Main Results:

  • Somatotroph adenomas showed higher CDKN2A and SSTR2 expression but lower EGFR, CDK4, and CDH2 compared to other adenoma types.
  • CDKN2A expression positively correlated with SSTR2 and negatively with CDK4, EGFR, and CDH2.
  • Lower CDKN2A was linked to larger tumor size and increased invasiveness.
  • Palbociclib inhibited proliferation, induced G1 arrest, and reduced GH/IGF-1 secretion in cell lines, with greater effect in GH3 cells.

Conclusions:

  • CDKN2A modulates CDK4 activity, impacting somatotroph adenoma bioactivity.
  • Elevated CDKN2A levels predict insensitivity to palbociclib treatment in somatotroph adenoma patients.
Keywords:
somatotroph adenomasINK4 familyCDKN2A (p16INK4A)palbociclibCDK4

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