Neuronal expression and neuritogenic action of group X secreted phospholipase A2

Seiko Masuda, Makoto Murakami, Yasukazu Takanezawa, Junken Aoki, Hiroyuki Arai, Yukio Ishikawa, Toshiharu Ishii, Manabu Arioka, Ichiro Kudo

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54 Citations (Scopus)


Although individual mammalian secreted phospholipase A2 (sPLA2) enzymes exhibit unique tissue and cellular distributions, the cell type-specific functions of each enzyme remain largely unknown. In this study, we found by immunohistochemistry that group X sPLA2 (sPLA 2-X) is uniquely located in the peripheral neuronal fibers, an observation that was supported by detection of its transcript and protein in the neuronal cell line PC12 and in primary dorsal root ganglia neurons. Adenoviral expression of sPLA2-X in PC12 cells facilitated neurite outgrowth, particularly when combined with a suboptimal concentration of nerve growth factor. In neuronally differentiated PC12 cells, sPLA2-X was preferentially localized in the Golgi apparatus and growth cones, and proteolytic conversion of the proenzyme to mature enzyme mainly occurred after the secretion process. The neurite-extending ability of sPLA2-X depended on the production of its catalytic product, lysophosphatidylcholine. Moreover, nerve growth factor-induced neurite extension of PC12 cells was modestly but significantly attenuated by an anti-sPLA2-X antibody or by a small interfering RNA for sPLA2-X. These observations suggest the potential contribution of sPLA2-X to neuronal differentiation, and possibly repair, under certain conditions.

Original languageEnglish
Pages (from-to)23203-23214
Number of pages12
JournalJournal of Biological Chemistry
Issue number24
Publication statusPublished - 2005 Jun 17

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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