Acta Biologica Hungarica

, Volume 58, Issue 2, pp 139–150 | Cite as

Multiple Signaling Pathways Involved in the Effect of Endothelin Type B Receptor in Rat Median Eminence

  • Yaira Mathison
  • María Rosario del Garrido
  • Anita IsraelEmail author


We assessed the possible link between endothelin receptor mediated phosphoinositide breakdown and NO/cGMP signaling pathways in rat arcuate nucleus-median eminence fragments (AN-ME), brain structures known to contain a rich plexus of nitric oxide synthase (NOS)-containing neurons and fibers, together with densely arranged endothelin ETB-receptors-like immunoreactive fibres. Our data show that ET-1, ET-3 and the ETB-receptors agonist, IRL 1620, increased inositol monophosphate (InsP1) accumulation, NOS activity and cGMP formation, in a similar degree. The stimulatory effect of ETs on InsP1 accumulation and cGMP formation was inhibited by the phospholipase C (PLC) inhibitor, neomycin, and the absence of extracellular calcium, suggesting that calcium is involved in endothelin receptor-induced PLC activation. The L-arginine analog, L-NAME, inhibited ET-1 or IRL1620-stimulated cGMP formation. The ETA receptor antagonists BQ 123, did not alter, while the ETB receptor antagonists BQ788 inhibited ETs-induced increase in the PI metabolism, NOS activity and cGMP generation. Our data indicate that in AN-ME, ETB receptor signals through receptor-mediated calcium dependent-stimulation of phosphoinositide breakdown and activation of NOS/cGMP signaling pathway.


NO/cGMP endothelin receptor median eminence rat 


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Authors and Affiliations

  • Yaira Mathison
    • 1
  • María Rosario del Garrido
    • 2
  • Anita Israel
    • 2
    Email author
  1. 1.School of Medicine José María VargasUniversidad Central de VenezuelaCaracasVenezuela
  2. 2.School of Pharmacy, Laboratory of NeuropeptidesUniversidad Central de VenezuelaCaracasVenezuela

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