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Leptin in the Commissural Nucleus Tractus Solitarii Increases the Glucose Responses to Carotid Chemoreceptors Activation by Cyanide

  • Mónica Lemus
  • Cynthia Mojarro
  • Sergio MonteroEmail author
  • Valery Melnikov
  • Mario Ramírez-Flores
  • Elena Roces de Álvarez-BuyllaEmail author
Conference paper
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 1071)

Abstract

Leptin is a protein hormone that plays a key role in the regulation of energy balance and glucose homeostasis. Leptin and all leptin receptor isoforms are present in the carotid bodies, but its precise function in glucose regulation and metabolism is not yet known. The aim of this study was to determine whether exogenous leptin, microinjected into the commissural nucleus tractus solitarii (cNTS), preceding sodium cyanide (NaCN) injection into the circulatory isolated carotid sinus (ICS), in vivo, modifies hyperglycemic reflex (HR) and brain glucose retention (BGR). In anesthetized Wistar rats (sodium pentobarbital, i.p. 3.3 mg/100 g/saline, Pfizer, Mex), arterial and venous blood samples were collected from silastic catheters implanted in the abdominal aorta and jugular sinus. Exogenous leptin (50 ng/20 nL of aCSF) or leptin vehicle (20 nL of aCSF) microinjected (stereotaxically) into the cNTS 4 min before NaCN (5 μg/100 g/50 μL saline into ICS) (experimental 1 [E1] and control 1[C1] groups, respectively) significantly increased HR and BGR compared with their basal values, but the increase was bigger in the E1 group. When leptin or aCSF were injected into the cNTS before saline (E2 and C2 groups, respectively) glucose responses did not vary when compared with their basal levels. Leptin and its receptors in the cNTS cells probably contribute to their sensitization during hypoxia.

Keywords

Brain glucose retention Carotid body chemoreceptors cNTS- hyperglycemic reflex Leptin 

Notes

Acknowledgements

Our work was supported by Consejo Nacional de Ciencia y Tecnología, México (CB20121-177047).

Conflict of Interest Statement

The authors declare no conflict of interest.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Mónica Lemus
    • 1
  • Cynthia Mojarro
    • 1
  • Sergio Montero
    • 1
    • 2
    Email author
  • Valery Melnikov
    • 2
  • Mario Ramírez-Flores
    • 2
  • Elena Roces de Álvarez-Buylla
    • 1
    Email author
  1. 1.Centro Universitario de Investigaciones BiomédicasUniversidad de ColimaColimaMexico
  2. 2.Facultad de MedicinaUniversidad de ColimaColimaMexico

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