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Bone Targeted Parathyroid Hormone Antagonists for Prevention of Breast Cancer Bone Metastases

Muralidharan Anbalagan1, Tulasi Ponnapakkam1,2, Binghao Zou1

  • 1Department of Structural and Cellular Biology, Tulane University School of Medicine, New Orleans, LA 70112, USA.

Cancers
|September 13, 2025
PubMed
Abstract

Insights

Novel bone-targeted parathyroid hormone (PTH) antagonists fused to a collagen-binding domain (CBD) effectively reduced breast cancer bone metastases and bone destruction in preclinical models.

Area of Science:

  • Oncology
  • Pharmacology
  • Biotechnology

Background:

  • Advanced breast cancer frequently metastasizes to bone, causing significant morbidity and mortality.
  • Current treatments for bone metastases are limited, highlighting the need for targeted therapies.
  • Parathyroid hormone-related peptide (PTHrP) secreted by tumors drives bone degradation and tumor growth.

Purpose of the Study:

  • To evaluate novel bone-targeted parathyroid hormone (PTH) antagonists fused to a collagen-binding domain (CBD).
  • To assess the efficacy of PTH(7-33)-CBD and [W2]PTH(1-33)-CBD in preclinical models of breast cancer bone metastases.

Main Methods:

  • Utilized intra-tibial and intra-iliac breast tumor models in mice.
  • Assessed drug efficacy using bioluminescent imaging, X-ray, and micro-computed tomography (micro-CT).

Main Results:

  • Both CBD-fused PTH antagonists significantly reduced tumor burden and osteolysis (bone destruction) compared to controls.
  • [W2]PTH(1-33)-CBD demonstrated additional benefits by improving trabecular bone structure.
  • Efficacy was confirmed in both tibial and iliac bone tumor models.

Conclusions:

  • CBD-fused PTH/PTHrP antagonists represent a promising therapeutic strategy for managing breast cancer bone metastases.
  • Enhanced bone targeting via CBD fusion improves the therapeutic potential of PTH antagonists.
Keywords:
bone metastasismetastatic breast cancerparathyroid hormone antagoniststargeted therapy

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