Acta Biologica Hungarica

, Volume 55, Issue 1–4, pp 65–70 | Cite as

Nitric Oxide Regulates the Levels of cGMP Accumulation in the Cricket Brain

  • H. AonumaEmail author
  • K. Niwa


Cricket brains were incubated in a saline containing nitric oxide (NO)-donor and phosphodiesterase inhibitor IBMX, which could activate soluble guanylate cyclase (sGC) to increase cGMP levels in the targets of NO. The increase of cGMP was detected by immunohistochemistry and enzyme linked immunosorbent assay. NO-induced cGMP immunohistochemistry revealed that many cell bodies of cricket brain showed cGMP immunoreactivity when preparations were treated with a saline containing 10 mM NO-donor SNP and phosphodiesterase inhibitor IBMX, but only a few cell bodies showed immunoreactivity when preparations were incubated without NO-donor. The concentration of cGMP in cricket brains were then measured by using cGMP-specific enzyme linked immunosorbent assay. Cricket brains were treated with a saline containing 1 μM of NO-donor NOR3 and 1 mM IBMX. The cGMP levels in the brain were increased about 75% compared to control preparations that was treated with a cricket saline containing IBMX. The level of cGMP decreased about 40% when preparations were incubated NOR3 saline containing sGC inhibitor ODQ. These results indicate that NO activates sGC and increases the levels of cGMP in particular neurons of the cricket brain and that the level of cGMP would be kept a particular level, which might regulate synaptic efficacy in the neurotransmission.


Insect brain cricket soluble guanylate cyclase nitric oxide cGMP 


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© Akadémiai Kiadó, Budapest 2004

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Authors and Affiliations

  1. 1.Laboratory of Neuro-Cybernetics, Research Institute for Electronic ScienceHokkaido UniversitySapporoJapan
  2. 2.Laboratory of Biofluid Dynamics, Research Institute for Electronic ScienceHokkaido UniversitySapporoJapan

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