Involvement of Ca2+ in globular adiponectin-induced reactive oxygen species

Sumio Akifusa, Noriaki Kamio, Yoshihiro Shimazaki, Noboru Yamaguchi, Yoshihisa Yamashita

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Globular adiponectin (gAd) induces the generation of reactive oxygen species (ROS) and nitric oxide (NO) in the murine macrophage cell line RAW 264. We investigated the role of Ca2+ in gAd-induced ROS and NO generation. Pretreatment with BAPTA-AM, a selective chelator of intracellular Ca2+ ([Ca2+]i), partially reduced gAd-induced generation of ROS and NO in gAd-treated RAW 264 cells. The lowest [Ca2+]i occurred 30 min after gAd treatment, after which [Ca2+]i increased continually and exceeded the initial level. The mitochondrial Ca2+ ([Ca2+]m) detected by Rhod-2 fluorescence started to increase at 6 h after gAd treatment. Pretreatment with a NAD(P)H oxidase inhibitor, diphenyleneiodonium, prevented the reduction of [Ca2+]i in the early phase after gAd treatment. Calcium depletion by BAPTA-AM had no effect on the gAd-induced [Ca2+]m oscillation. The administration of a specific calmodulin inhibitor, calmidazolium, significantly suppressed gAd-induced ROS and NO generation and NOS activity.

Original languageEnglish
Pages (from-to)649-653
Number of pages5
JournalBiochemical and Biophysical Research Communications
Issue number4
Publication statusPublished - Apr 17 2009

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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