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Updated: May 10, 2026
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Collection of Post-mating Semen from the Female Reproductive Tract and Measurement of Semen Liquefaction in Mice
Published on: November 18, 2017
Proteomic analysis reveals a proteolytic feedback loop in murine seminal fluid.
Chad M McKee1, Danmei Xu, Benedikt M Kessler
1Department of Oncology, Gray Institute of Radiation Oncology and Biology, University of Oxford, Oxford, UK.
The Prostate
|June 15, 2013
Summary
Matrix metalloproteinase 9 (MMP9) targets Protease Nerin 1 (PN1), an inhibitor that blocks collagen breakdown. This interaction is key to understanding MMP9's role in seminal vesicle function and potential therapeutic strategies.
Area of Science:
- Biochemistry
- Proteomics
- Molecular Biology
Background:
- Matrix metalloproteinase 9 (MMP9) influences extracellular matrix remodeling, angiogenesis, and inflammation.
- Understanding MMP9's specific targets and regulation is crucial for elucidating its physiological roles.
- Identifying MMP9 targets is critical for understanding its proteolytic cascades.
Purpose of the Study:
- To identify MMP9 targets, inhibitors, and interactors in mouse seminal vesicle fluid (SVF).
- To investigate the interaction between MMP9 and Protease Nerin 1 (PN1).
- To explore the implications of MMP9-PN1 interaction on seminal vesicle function and fertility.
Main Methods:
- Utilized transgenic mouse models (wild type, mmp9-/-, pn1-/-).
- Employed ultra-high performance liquid chromatography mass spectroscopy (UPLC-MS(E)) for proteomics analysis.
- Analyzed SVF to detect differences in protein composition.
Main Results:
- Proteomics analysis revealed differences in serine protease inhibitors (serpins), reproductive proteins, developmental regulators, and cancer proto-oncogenes.
- Protease Nerin 1 (PN1) was elevated in mmp9-/- mice, and MMP9 mediated its N-terminal cleavage, reducing its activity.
- A feedback loop was suggested where PN1 inhibition enhances MMP9 activity.
Conclusions:
- This study expands the known targets of MMP9 within seminal vesicle fluid.
- Protease Nerin 1 (PN1) is identified as a novel inhibitor of MMP9 activity and collagen cleavage.
- The interaction between MMP9 and PN1 may offer insights into seminal vesicle function, fertility, and potential therapeutic targets.
