オオニシ ジュンジ  onishi junji
大西 淳之

  • 所属   東京家政大学  家政学部 栄養学科
  •     東京家政大学大学院  人間生活学総合研究科 健康栄養学専攻
  •     東京家政大学大学院  人間生活学総合研究科 人間生活学専攻
  •     東京家政大学短期大学部  短期大学部 栄養科
  • 職種   教授
論文種別 原著
言語種別 英語
査読の有無 査読あり
表題 Identification of porcine follipsin as plasma kallikrein, and its possible involvement in the production of bradykinin within the follicles of porcine ovaries.
掲載誌名 正式名:Molecular Reproduction and Development
略  称:Mol Reprod Dev
ISSNコード:1040452X/10982795
掲載区分国外
巻・号・頁 57(1),pp.79-87
著者・共著者 ◎Kimura A, Kihara T, Okimura H, Hamabata T, Ohnishi J, Moriyama A, Takahashi K, Takahashi T.
発行年月 2000/09
概要 To determine the identity of porcine follipsin, a plasma kallikrein cDNA clone was isolated from a porcine liver cDNA library. The clone encoded a protein of 643 amino acids, exhibiting identities 79.7, 72. 9, and 74.4% homologous to human, rat, and mouse plasma prekallikrein, respectively. The amino acid sequences of four internal peptides isolated from the tryptic digest of follipsin were all found in the deduced sequence. Authentic plasma kallikrein was purified from porcine plasma and compared directly with follipsin. Actions on synthetic substrates and behaviors with proteinase inhibitors were indistinguishable between these two enzymes. The cDNA was expressed in COS-7 cells and the recombinant protein was prepared from the culture medium of these cells. No active enzyme could be obtained, but the expressed protein was reacted with anti-porcine plasma kallikrein antibody. The mRNA was detected only in the liver in northern blot analysis. RT-PCR analysis of RNAs revealed that porcine testis, in addition to the liver, expressed the corresponding mRNA. In the ovary, plasma kallikrein was detected as a main band of the active form (Mr = 85,000) and the band of the minor inactive precursor form (Mr = 80,000), respectively. In contrast, the liver extract contained only the precursor form. Incubation of high molecular weight kininogen with follicular fluid plasma kallikrein resulted in an increased production of bradykinin. Further, the fresh fluid of large-sized follicles of porcine ovaries was found to contain this peptide hormone at a detectable level. These results indicate that porcine follipsin is plasma kallikrein, and that the enzyme may be involved in the production of bradykinin within ovarian follicles.
PMID PMID: 10954859