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Matrilysin expression in the involuting rat ventral prostate
W C Powell1, F E Domann, J M Mitchen
1Department of Radiation Oncology, University of Arizona Medical School, Tucson, USA.
Abstract:
Matrilysin (PUMP-1) is a member of the matrix metalloproteinase (MMP) family of extracellular matrix degrading enzymes that has been found to be overexpressed in human prostate cancer. The rat ventral prostate (RVP) following castration has been used as a model for both tissue involution and apoptosis. Northern analysis and in situ hybridization were used to determine the time course and localization of matrilysin during 8 days of RVP involution. Northern analysis revealed that the 1.2 kb matrilysin mRNA was undetectable in normal RVP. An increase in the steady-state levels of matrilysin mRNA was observed 5 days after castration, and the levels began to decline by 8 days after castration. The mRNAs for tissue inhibitor of metalloproteinase-1 and urokinase-type plasminogen activator also showed a time-dependent induction during the course of involution. Localization of matrilysin by in situ hybridization indicated that the mRNA was produced by epithelial cells of the involuting RVP. The matrilysin message was observed in a small number of glands within the whole RVP. Matrilysin protein was present in the RVP and peaked 3 days after castration. The combination of proteinase genes expressed in the RVP following castration indicate that the MMP and serine protease families of enzymes may interact during tissue remodeling of the RVP following castration.
Insights
Matrilysin (PUMP-1) mRNA and protein levels increase during rat prostate involution after castration. This matrix metalloproteinase (MMP) is expressed by epithelial cells, suggesting a role in tissue remodeling.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Matrilysin (PUMP-1), a matrix metalloproteinase (MMP), is implicated in human prostate cancer.
- The rat ventral prostate (RVP) after castration serves as a model for tissue involution and apoptosis.
Purpose of the Study:
- To investigate the temporal expression and localization of matrilysin during rat ventral prostate involution.
- To understand the role of matrilysin in prostate tissue remodeling post-castration.
Main Methods:
- Northern analysis to quantify matrilysin mRNA levels over time.
- In situ hybridization to determine the cellular localization of matrilysin mRNA.
- Protein analysis to assess matrilysin presence and peak expression.
Main Results:
- Matrilysin mRNA was undetectable in normal RVP, increasing 5 days post-castration and declining by day 8.
- Matrilysin protein peaked 3 days after castration.
- Matrilysin mRNA was localized to epithelial cells in the involuting RVP.
Conclusions:
- Matrilysin expression is induced during RVP involution following castration.
- The findings suggest potential interactions between MMPs and serine proteases in prostate tissue remodeling.