Starfish ApDOCK protein essentially functions in larval defense system operated by mesenchyme cells

Ryohei Furukawa, Hiromi Funabashi, Midori Matsumoto, Hiroyuki Kaneko

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In larvae of the starfish, Asterina pectinifera, mesenchyme cells operate in the defense system through various behaviors. We have investigated mesenchyme cell dynamics during the immune response by identifying ApDOCK, a new member of the DOCK180 superfamily protein. In 4-day-old bipinnaria larvae processed for morpholino oligonucleotide-mediated knockdown of ApDOCK, injection of inorganic foreign substances revealed that (1) mesenchyme cells fail to undergo either directed migration toward a large oil-droplet or persistent spreading on the oil-droplet after contact; (2) neither uptake of micro-beads nor cell-to-cell fusion on the large oil-droplet differed from that of mesenchyme cells from control larvae. Similar behaviors were also recorded in experiments where bacteria were injected. Under culture conditions, the expression level of ApDOCK mRNA was significantly associated with the immunological behavior of mesenchyme cells. Apparently, the mesenchyme cells from ApDOCK loss-of-function larvae exhibited insufficient lamellipodium formation via lack of fibrous form of actin organization at the leading edge. These results suggest that the migratory congregation and persistence of encapsulation of larval mesenchyme cells are intracellularly regulated by ApDOCK protein, and this regulation is associated with organization of cytoskeletal actin.

Original languageEnglish
Pages (from-to)955-965
Number of pages11
JournalImmunology and Cell Biology
Issue number10
Publication statusPublished - 2012 Nov


  • Cell migration
  • DOCK180 superfamily
  • Encapsulation
  • Lamellipodium formation
  • Larval mesenchyme cells
  • Starfish

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Cell Biology


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