Extended blood half-life of monomethoxypolyethylene glycol-conjugated hen lysozyme is a key parameter controlling immunological tolerogenicity

T. So, H. O. Ito, M. Hirata, T. Ueda, T. Imoto

研究成果: ジャーナルへの寄稿記事

12 引用 (Scopus)


The blood half-life of a protein is prolonged by conjugating a protein with a linear amphiphilic polymer, monomethoxypolyethylene glycol (mPEG). The conjugation gives a protein immunotolerogenicity; hence, it is likely that the long half-life is crucial for the tolerogenicity. We prepared a tolerogenic mPEG conjugate of hen egg lysozyme (mPEG1.5-HEL), which is conjugated 1.5-fold the molecular weight of mPEG against that of HEL, and evaluated the relationship between in vivo stability and the tolerogenicity. mPEG1.5-HEL retained immunogenicity to prime HEL-specific T cell and antibody responses and had a long blood half-life, more than 27 times that of native HEL. The tolerant state was maintained as long as mPEG1.5-HEL was detected in sera. With a decrease in the blood mPEG1.5-HEL level, the tolerant state returned gradually to the responsive state; however, reinjection of mPEG1.5-HEL again restored the tolerance. Thus, the extended blood half-life of HEL by mPEG conjugation is probably vital for establishing and maintaining the tolerant states.

ジャーナルCellular and Molecular Life Sciences
出版物ステータス出版済み - 8 11 1999


All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Molecular Biology
  • Pharmacology
  • Cellular and Molecular Neuroscience
  • Cell Biology