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Updated: Jul 19, 2026
Murine Prostate Micro-dissection and Surgical Castration
Published on: May 11, 2016
Castration-induced epithelial cell death in human prostate tissue is related to locally reduced IGF-1 levels
Nina Ohlson1, Anders Bergh, Pär Stattin
1Department of Medical Biosciences, Pathology, Umeå University, Umeå, Sweden.
Background:
Castration rapidly reduces stroma insulin-like growth factor (IGF)-1 synthesis and action in mouse prostate epithelium. We explore if similar changes are of importance for castration-induced prostate regression in humans.
Methods:
Epithelial and surrounding stroma cells were micro-dissected from patient biopsies obtained before and shortly after castration. IGF-1 mRNA levels were quantified by RT-PCR and related to epithelial apoptosis and IGF-1, IGF-1 receptor, and androgen receptor (AR) immunoreactivity.
Results:
IGF-1 mRNA was principally produced in the stroma and IGF-R1 in the epithelium. Stroma IGF-1 mRNA levels were significantly decreased after castration in non-malignant but not malignant tissue. Lack of stroma IGF-1 reduction after castration was associated with low stroma AR expression before therapy. Reduction of IGF-1 mRNA levels in the tumor stroma and/or epithelium was associated with epithelial apoptosis after therapy.
Conclusions:
Low AR expression and maintained stroma IGF-1 synthesis may result in limited tumor cell death after castration therapy.
Insights
Castration reduces prostate insulin-like growth factor (IGF)-1 in humans, but not in malignant tissue. Low androgen receptor (AR) expression may limit prostate cancer cell death after castration therapy.
Area of Science:
- Urology
- Endocrinology
- Cancer Biology
Background:
- Prostate cancer progression is linked to insulin-like growth factor (IGF)-1 signaling.
- Castration therapy aims to reduce androgens, impacting prostate tissue.
Purpose of the Study:
- To investigate the role of IGF-1 in human prostate cancer regression after castration.
- To determine if stroma IGF-1 changes correlate with epithelial apoptosis and androgen receptor (AR) expression.
Main Methods:
- Micro-dissection of epithelial and stroma cells from patient biopsies before and after castration.
- Quantification of IGF-1 mRNA via RT-PCR.
- Assessment of IGF-1, IGF-1 receptor, and AR immunoreactivity.
Main Results:
- IGF-1 mRNA predominantly found in stroma; IGF-1 receptor in epithelium.
- Stroma IGF-1 mRNA decreased post-castration in non-malignant tissue, but not malignant tissue.
- Reduced stroma IGF-1 post-castration correlated with epithelial apoptosis.
- Low stroma AR expression before therapy was linked to lack of stroma IGF-1 reduction.
Conclusions:
- Maintained stroma IGF-1 synthesis, potentially due to low AR expression, may impede prostate cancer cell death following castration.
- Findings suggest a mechanism where androgen receptor signaling influences IGF-1's role in castration resistance.
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