The Interaction among Protein C Inhibitor, Prostate-Specific Antigen, and the Semenogelin System

Koji Suzuki; Hideaki Kise; Junji Nishioka; Tatsuya Hayashi

doi:10.1055/s-2006-958461

Seminars in Thrombosis and Hemostasis, Table of Contents

Semin Thromb Hemost 2007; 33(1): 046-052
DOI: 10.1055/s-2006-958461

The Interaction among Protein C Inhibitor, Prostate-Specific Antigen, and the Semenogelin System

Koji Suzuki¹ , Hideaki Kise² , Junji Nishioka¹ , Tatsuya Hayashi¹

¹Department of Molecular Pathobiology, Mie University Graduate School of Medicine, Tsu-city, Mie, Japan
²Department of Urology, Mie University Graduate School of Medicine, Tsu-city, Mie, Japan

Abstract

ABSTRACT

The kallikrein-like serine protease, prostate-specific antigen (PSA), is mixed in human seminal plasma with its protein substrates semenogelin (Sg) -I, Sg-II, and protein C inhibitor (PCI), which are produced in seminal vesicles. In the seminal plasma, PSA degrades Sg-I, and Sg-II, which are major components in insoluble coagula, and PCI inhibits PSA by forming a PSA-PCI complex. Digestion of seminal coagula with PSA releases PCI and PSA-PCI complex from the coagula into a soluble phase, suggesting the presence of active PCI within the coagula. PCI forms a ternary complex with PSA and Sg-II in the seminal plasma. The binding of Sg-II to PSA and PCI is influenced by pH, ionic strength, heparin, negatively charged dextran sulfate, divalent cations, and particularly by Zn^{2 +}. These observations suggest that binding of PCI to Sg in seminal vesicles regulates the PSA-catalyzed degradation of Sg in seminal plasma; the complex formation among PCI, PSA, and Sg is modulated by several factors in seminal plasma.

KEYWORDS

Protein C inhibitor - prostate-specific antigen - semenogelins - seminal plasma - male reproduction

Full Text

References

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Professor Koji SuzukiPh.D.

Mie University Graduate School of Medicine

Edobashi 2-174, Tsu-city, Mie, 514-8507, Japan

Email: suzuki@doc.medic.mie-u.ac.jp