Ability of fibrinogen γ-derived dodecapeptides with different sequences to bind to rat platelets

Koji Tokutomi, Toshiaki Tagawa, Maki Korenaga, Masatoshi Chiba, Tomohiro Asai, Naohide Watanabe, Shinji Takeoka, Makoto Handa, Yasuo Ikeda, Naoto Oku

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    Abstract

    A dodecapeptide (γ400-411) derived from a fibrinogen γ-chain carboxyl-terminal sequence recognizes specifically the active form of GPIIb/IIIa on the surface of activated platelets. For the purpose of efficient hemostasis, we previously developed ADP-encapsulated liposomes modified with human-dodecapeptide (HHLGGAKQAGDV, human-H12). On the other hand, the amino-acid sequence of H12 from rats is HHMGGSKQVGDM, having only 67% homology to that from humans. Here, we investigated the ability of rat-H12 in comparison with human-H12 to bind to platelets. Firstly, rat platelets were activated with phorbol-12-myristate-13-acetate (PMA), and the activation was confirmed by flow cytometry. Next, we evaluated the dissociation constant (Kd) of human-H12 and rat-H12 for dissociation from rat platelets by using FACS. As a result, the Kd of human-H12 and rat-H12 with respect to rat platelets was 2.78 ± 0.21 and 2.91 ± 0.22 μM, respectively. Furthermore, H12 from both species inhibited quite similarly the aggregation of rat platelets in platelet-rich plasma (PRP). These results suggest that H12 from different species with different amino acid sequences interacts similarly with GPIIb/IIIa on platelets.

    Original languageEnglish
    Pages (from-to)296-301
    Number of pages6
    JournalInternational Journal of Pharmaceutics
    Volume438
    Issue number1-2
    DOIs
    Publication statusPublished - 2012 Nov 15

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    Keywords

    • Dodecapeptide
    • Fibrinogen
    • GPIIb/IIIa
    • Hemostasis
    • Human
    • Rat

    ASJC Scopus subject areas

    • Pharmaceutical Science

    Cite this

    Tokutomi, K., Tagawa, T., Korenaga, M., Chiba, M., Asai, T., Watanabe, N., Takeoka, S., Handa, M., Ikeda, Y., & Oku, N. (2012). Ability of fibrinogen γ-derived dodecapeptides with different sequences to bind to rat platelets. International Journal of Pharmaceutics, 438(1-2), 296-301. https://doi.org/10.1016/j.ijpharm.2012.09.016