Phospholipase A2 activity is required for regeneration of sensory axons in cultured adult sciatic nerves

Research output: Contribution to journalArticle

Abstract

The adult frog dorsal root ganglia (DRGs) and their sciatic nerves (ScN) survive in organ culture for several days. About 3 days after a local test crush, the sensory axons start to regenerate into the distal nerve stump at a rate of approximately 0.6-0.9 mm/day. The axonal outgrowth is inhibited in a non-toxic way by low concentrations of three different phospholipase A2 (PLA2) inhibitors: 4-bromophenacyl bromide (BPB), aristolochic acid, and oleyl-oxyethyl-phosphoryl-choline (OOPC). In contrast, the outgrowth was slightly stimulated by 0.2 μM melittin, a PLA2 activator. Most experiments refer to the effects of BPB, which was shown to almost completely inhibit outgrowth at a concentration which did not affect either ganglionic protein synthesis or axonal transport. Using a compartmental system it could clearly be shown that BPB exerted its action in the outgrowth region. Other experiments showed that the initial period (about 3 days), which precedes the outgrowth, was unaffected by BPB. Several structures, including axonal ones, showed immunoreactivity for the low molecular form of PLA2 (sPLA2). The results suggest that PLA2 activity plays an important role in nerve regeneration and exerts its action at a local level, where the growth cones move forward.

Details

Authors
Organisations
External organisations
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Cell Biology

Keywords

  • 4-bromophenacyl bromide, melittin, phospholipase A2, regeneration, sciatic nerve
Original languageEnglish
Pages (from-to)183-189
Number of pages7
JournalJournal of Neuroscience Research
Volume43
Issue number2
Publication statusPublished - 1996
Publication categoryResearch
Peer-reviewedYes