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Related Experiment Video

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An Ex vivo Model to Study Hormone Action in the Human Breast
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Breast Cancer and Prolactin - New Mechanisms and Models.

Charles V Clevenger1, Hallgeir Rui2

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Prolactin (PRL) has dual roles in breast cancer, promoting differentiation via PRL receptor long isoform (PRLrL) complexes and oncogenesis via intermediate and long isoform (PRLrI-PRLrL) complexes. New models reveal PRL

Keywords:
Jak2/Stat5endocrine resistancemetastasismouse models

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Area of Science:

  • Endocrinology
  • Oncology
  • Molecular Biology

Background:

  • Breast cancer pathogenesis involves hormones and growth factors, including prolactin (PRL).
  • The distinct roles of PRL in mammary differentiation and oncogenesis are not fully understood.
  • PRL receptors (PRLr) are implicated in breast cancer development and progression.

Purpose of the Study:

  • To review recent studies elucidating the roles of PRL and its receptors in breast cancer.
  • To examine novel mechanisms of PRL action mediated by differential PRLr isoform utilization.
  • To introduce a new mouse model for studying prolactin-driven breast cancer xenografts.

Main Methods:

  • Analysis of studies on PRLr isoform complexes (PRLrL-PRLrL and PRLrI-PRLrL).
  • Description of the immunodeficient, prolactin-humanized NSG-Pro mouse model.
  • Evaluation of patient-derived breast cancer xenografts in the NSG-Pro model.

Main Results:

  • Differential PRLr isoform utilization dictates opposing PRL actions: PRLrL-PRLrL promotes differentiation, while PRLrI-PRLrL triggers oncogenesis.
  • The NSG-Pro model supports growth of PRLr-expressing xenografts, revealing PRL interactions with estrogen and ERBB2 networks.
  • PRL influences drug responsiveness and promotes breast cancer metastasis in vivo.

Conclusions:

  • PRL signaling, through distinct PRLr isoforms, plays a complex role in breast cancer.
  • Novel experimental models enhance understanding of PRL's impact on breast cancer growth, drug response, and metastasis.
  • Targeting PRLr signaling offers potential therapeutic strategies for breast cancer treatment.