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Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
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CDK4/6 Dependence of Cyclin D1-Driven Parathyroid Neoplasia in Transgenic Mice

Jessica Costa-Guda1,2, Kristin Corrado1, Justin Bellizzi1

  • 1Center for Molecular Oncology, University of Connecticut School of Medicine, Farmington, Connecticut.

Endocrinology
|September 3, 2020
PubMed

Insights

Cyclin D1 drives parathyroid cancer mainly through cyclin-dependent kinase (CDK) pathways, unlike in mammary cancer where it acts independently. This highlights tissue-specific differences in tumorigenesis and therapeutic targeting of CDK4/6 inhibitors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Cyclin D1 is an oncogene protein that activates cyclin-dependent kinases (CDK)4/6, phosphorylating retinoblastoma protein (pRB).
  • Nonclassical, CDK-independent functions of cyclin D1 are known, but their role in neoplasia requires further study, especially concerning CDK4/6 inhibitors.
  • The precise mechanisms of cyclin D1 in parathyroid tumorigenesis are not fully understood.

Purpose of the Study:

  • To investigate whether cyclin D1's role in parathyroid tumorigenesis is primarily kinase-dependent or kinase-independent.
  • To compare the mechanisms of cyclin D1-driven tumorigenesis in parathyroid versus mammary tissues.
  • To assess the implications for CDK4/6 inhibitor therapies.

Main Methods:

  • Utilized a mouse model of cyclin D1-driven parathyroid tumorigenesis (PTH-D1).
  • Generated transgenic mice expressing a kinase-dead mutant cyclin D1 (KE) unable to activate partner kinases.
  • Compared parathyroid and mammary tumorigenesis in mice expressing wild-type versus mutant cyclin D1.

Main Results:

  • Parathyroid-overexpressed cyclin D1 KE mice did not develop hyperparathyroidism or parathyroid hypercellularity.
  • Mammary tumorigenesis was effectively driven by the kinase-dead cyclin D1 KE mutant in an analogous model.
  • Cyclin D1 drives parathyroid tumorigenesis predominantly through CDK-dependent mechanisms, contrasting with CDK-independent mammary cancer.

Conclusions:

  • Cyclin D1 drives parathyroid cancer primarily via CDK-dependent pathways, unlike mammary cancer.
  • Highlights significant tissue-specific differences in cyclin D1-driven tumorigenesis.
  • Suggests parathyroid/endocrine cells may be uniquely vulnerable to disruptions in CDK-mediated proliferation control, impacting therapeutic strategies.
Keywords:
cell cycleparathyroid adenomaprimary hyperparathyroidismtumorigenesis

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