Histamine-releasing reaction induced by the N-terminal domain of Vibrio vulnificus metalloprotease

Shin-ichi Miyoshi, Koji Kawata, Masayoshi Hosokawa, Ken Ichi Tomochika, Sumio Shinoda

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A zinc metalloprotease secreted by Vibrio vulnificus, an opportunistic human pathogen causing septicemia and wound infection, stimulates exocytotic histamine release from rat mast cells. This protease consists of two functional domains: the N-terminal domain that catalyzes proteolytic reaction and the C-terminal domain that promotes the association with a protein substrate or cell membrane. Like the intact protease, the N-terminal domain alone also induced histamine release from rat peritoneal mast cells in a dose- and time-dependent manner. However, the reaction induced was apparently weak and went on more slowly. The nickel-substituted protease or its N-terminal domain, each of which has the reduced proteolytic activity due to decreased affinity to a substrate, showed much less histamine-releasing activity. When injected into the rat dorsal skin, the N-terminal domain also evoked enhancement of the hypodermic vascular permeability, while the activity was comparable to that of the protease. Taken together, the protease may stimulate histamine release through the action of the catalytic center of the N-terminal domain on the target substance(s) on the mast cell membrane. The C-terminal domain may support the in vitro action of the N-terminal domain by coordination of the association of the protease with the membrane, but it may not modulate the in vivo action.

Original languageEnglish
Pages (from-to)2235-2242
Number of pages8
JournalLife Sciences
Volume72
Issue number20
DOIs
Publication statusPublished - Apr 4 2003

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Keywords

  • Histamine
  • Mast cell
  • Metalloprotease
  • Vibrio vulnificus

ASJC Scopus subject areas

  • Pharmacology

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