Nitric Oxide in the Solitary Tract Nucleus (STn) Modulates Glucose Homeostasis and FOS-ir Expression After Carotid Chemoreceptor Stimulation

  • M. Lemus
  • S. Montero
  • S. Luquín
  • J. García
  • E. Roces De Álvarez-Buylla
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 648)

Abstract

We evaluate in rats the role of NO in the solitary tract nucleus (STn) after an anoxic stimulus to carotid body chemoreceptor cells (CChrc) with cyanide (NaCN), on the hyperglycemic reflex with glucose retention by the brain (BGR) and FOS expression (FOS-ir) in the STn. The results suggest that nitroxidergic pathways in the STn may play an important role in glucose homeostasis. A NO donor such as sodium nitroprusside (NPS) in the STn before CChrc stimulation increased arterial glucose level and significantly decreased BGR. NPS also induced a higher FOS-ir expression in STn neurons when compared to neurons in control rats that only received artificial cerebrospinal fluid (aCSF) before CChrc stimulation. In contrast, a selective NOS inhibitor such as Nω-nitro-L-arginine methyl ester (L-NAME) in the STn before CChrc stimulation resulted in an increase of both, systemic glucose and BGR above control values. In this case, the number of FOS-ir positive neurons in the STn decreased when compared to control or to NPS experiments. FOS-ir expression in brainstem cells suggests that CChrc stimulation activates nitroxidergic pathways in the STn to regulate peripheral and central glucose homeostasis. The study of these functionally defined cells will be important to understand brain glucose homeostasis.

Keywords

Nitric oxide solitary tract nucleus Glucose Sodium nitroprusside Fos Cerebrospinal fluid Carotid chemoreceptor 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • M. Lemus
    • 1
  • S. Montero
    • 1
  • S. Luquín
    • 2
  • J. García
    • 3
  • E. Roces De Álvarez-Buylla
    • 4
  1. 1.Centro Universitario de Investigaciones BiomédicasUniversidad de ColimaColima, Col. 28045Mexico
  2. 2.Centro de Investigaciones de OccidenteIMSS GuadalajaraMexico
  3. 3.Facultad de MedicinaUniversidad de GuadalajaraGuadalajaraMéxico
  4. 4.Universidad de Colima Av. 25 de Julio S/N, Col. villas de San SebastiánCol. 28045 Mexico

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