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Ca2+ homeostasis and apoptotic resistance of neuroendocrine-differentiated prostate cancer cells

K Vanoverberghe1, F Vanden Abeele, P Mariot

  • 1Laboratoire de Physiologie Cellulaire, INSERM EMI 0228, Université des Sciences et Technologies de Lille, Bât. SN3, Villeneuve d'Ascq 59655, France.

Cell Death and Differentiation
|December 20, 2003
PubMed

Insights

Neuroendocrine differentiation in prostate cancer alters intracellular calcium (Ca2+) handling, leading to reduced endoplasmic reticulum Ca2+ stores. This impacts apoptosis, offering potential therapeutic targets for advanced prostate cancer treatment.

Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • Neuroendocrine (NE) differentiation is characteristic of advanced, therapy-resistant prostate cancer.
  • NE tumor cells exhibit resistance to apoptosis, necessitating research into their cell death mechanisms.
  • Intracellular calcium (Ca2+) homeostasis is a critical regulator of apoptosis.

Purpose of the Study:

  • To investigate the impact of NE differentiation on intracellular Ca2+ homeostasis in prostate cancer cells.
  • To elucidate the role of Ca2+ dysregulation in the apoptotic resistance of NE prostate cancer.

Main Methods:

  • Induction of NE differentiation in androgen-dependent prostate cancer cells using cAMP elevation or androgen deprivation.
  • Assessment of intracellular Ca2+ levels, endoplasmic reticulum Ca2+ stores, and store-operated Ca2+ currents.
  • Evaluation of apoptosis induction using thapsigargin and TNF-alpha.

Main Results:

  • NE differentiation led to reduced endoplasmic reticulum Ca2+ stores due to decreased SERCA 2b Ca2+ ATPase and calreticulin expression.
  • Store-operated Ca2+ currents were downregulated in NE-differentiated cells.
  • NE-differentiated cells demonstrated enhanced resistance to apoptosis, independent of Bcl-2 overexpression.

Conclusions:

  • NE differentiation significantly alters Ca2+ homeostasis in prostate cancer cells.
  • Targeting key regulators of Ca2+ homeostasis may enhance apoptosis and provide a therapeutic strategy for advanced prostate cancer.

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