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Heparin-selenocystamine conjugate with selenol groups
1Department of Analytical Chemistry, Osaka University of Pharmaceutical Sciences, Takatsuki, Japan.
Biological & Pharmaceutical Bulletin
|September 22, 1998
Summary
A novel heparin-selenocystamine conjugate mimics the heparin-selenoprotein P complex, exhibiting glutathione peroxidase-like and antioxidant activities. This conjugate serves as a model for understanding the biological roles of selenium in biological systems.
Area of Science:
- Biochemistry
- Biomaterials Science
- Medicinal Chemistry
Background:
- Selenoprotein P is involved in selenium transport and antioxidant defense.
- Heparin is a glycosaminoglycan with anticoagulant properties and diverse biological functions.
- Understanding the interaction between heparin and selenoproteins could reveal novel antioxidant mechanisms.
Purpose of the Study:
- To synthesize a heparin-selenocystamine conjugate to mimic the heparin-selenoprotein P complex.
- To investigate the biochemical and antioxidant properties of the prepared conjugate.
- To evaluate the conjugate as a model compound for studying selenium's biological activity.
Main Methods:
- Chemical synthesis of heparin-selenocystamine conjugate.
- Spectroscopic analysis (UV-Vis) to confirm the structure and stability of the selenol group.
- Enzymatic assays to determine glutathione peroxidase-like activity against various hydroperoxides.
- Radical scavenging assays (DPPH and superoxide anion) to assess antioxidant capacity.
- Reaction kinetics with 5,5'-dithiobis(2-nitrobenzoic acid) (DTNB) to confirm selenol presence.
Main Results:
- The heparin-selenocystamine conjugate was successfully prepared, mimicking the target complex.
- The conjugate demonstrated significant glutathione peroxidase-like activity against hydrogen peroxide, tert-butyl hydroperoxide, and cumene hydroperoxide.
- Spectroscopic and chemical analyses confirmed the presence of a stable selenol group within the conjugate.
- The conjugate exhibited potent DPPH and superoxide anion radical scavenging activities.
- The reaction rate with DTNB was slower than cysteine, suggesting steric hindrance around the selenol group.
Conclusions:
- The heparin-selenocystamine conjugate serves as a stable and effective model compound.
- The conjugate possesses diverse biological activities, including antioxidant properties.
- These findings suggest a potential antioxidant role for the endogenous complex of heparin-like substances and selenoprotein P.