A Novel Strategy for a Drug Delivery System Using a Claudin Modulator

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  • Kondoh Masuo
    Department of Bio-Functional Molecular Chemistry, Graduate School of Pharmaceutical Sciences, Osaka University Department of Pharmaceutics and Biopharmaceutics, Showa Pharmaceutical University
  • Takahashi Azusa
    Department of Pharmaceutics and Biopharmaceutics, Showa Pharmaceutical University
  • Fujii Makiko
    Department of Pharmaceutics and Biopharmaceutics, Showa Pharmaceutical University
  • Yagi Kiyohito
    Department of Bio-Functional Molecular Chemistry, Graduate School of Pharmaceutical Sciences, Osaka University
  • Watanabe Yoshiteru
    Department of Pharmaceutics and Biopharmaceutics, Showa Pharmaceutical University

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  • Novel Strategy for a Drug Delivery System Using a Claudin Modulator

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With the continued progress in genomic drug discovery, the high-throughput production of drug candidates has become possible, and thus today there are a number of candidates that are extremely effective both in cell-free and in cell models. However, a drug delivery system suitable for the high-throughput production has yet to be fully developed. In tissues, the tight junction (TJ) plays a pivotal role as both a barrier to restrict various substances and in intra-tissue maintenance. Claudin, a ca. 23 kDa transmembrane protein with four transmembrane domains, is responsible for the TJ functions. Interestingly, for each of the 24 members of the claudin family, expression profiles and exact barrier functions differ. Therefore, claudin may be a potential target for use as a drug delivery system via a paracellular route. The C-terminal fragment of Clostridium perfringens enterotoxin (C-CPE) is known to modulate the barrier function of claudin. We found that C-CPE is a potent absorption-enhancer and that this enhancing activity is 400-fold greater than clinically used enhancers. The enhancing activity examined in this study involved an interaction between C-CPE and claudin-4. These findings indicate that claudin might be a novel target for a drug delivery system. In the current review, we describe about background and data on our research about claudin modulator, and we also discuss the possibility of the use of the claudin family in a new approach for developing a drug delivery system.

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