, Volume 46, Issue 3, pp 659–667 | Cite as

Crosstalk between nitric oxide synthases and cyclooxygenase 2 in the adrenal cortex of rats under lipopolysaccharide treatment

  • Rocío Sanchez
  • María E. Mercau
  • Esteban M. Repetto
  • Camila Martinez Calejman
  • Francisco Astort
  • Matías N. Perez
  • Pablo Arias
  • Cora B. CymeryngEmail author
Original Article


The effect of lipopolysaccharide on the modulation of steroid production by adrenal cells has been recently acknowledged. The purpose of this study was to determine the in vivo effects of LPS on adrenal cyclooxygenase 2 (COX-2) expression, analyze its crosstalk with the nitric oxide synthase (NOS) system, and assess its involvement on the modulation of glucocorticoid production. Male Wistar rats were injected with LPS and with specific inhibitors for NOS and COX activities. PGE2 and corticosterone levels were determined by RIA. Protein levels were analyzed by immunoprecipitation and western blotting. Transfection assays were performed in murine adrenocortical Y1 cells. Results show that LPS treatment increases PGE2 production and COX-2 protein levels in the rat adrenal cortex. Systemic inhibition of COX-2 blunted the glucocorticoid response to ACTH, as well as the increase in NOS activity and the NOS-2 expression levels induced by LPS. Conversely, NOS inhibition prevented the LPS-dependent increase in PGE2 production, COX-2 protein levels, and the nitrotyrosine modification of COX-2 protein. Treatment of adrenocortical cells with a NO-donor significantly potentiated the LPS-dependent increase in NFκB activity and COX-2 expression levels. In conclusion, our results show a significant crosstalk between COX-2 and NOS in the adrenal cortex upon LPS stimulation, in which each activity has a positive impact on the other. In particular, as both the activities differently affect adrenal steroid production, we hypothesize that this kind of fine modulation enables the gland to adjust steroidogenesis to prevent either an excessive or an insufficient response to the endotoxin challenge.


Glucocorticoids Adrenal cortex Nitric oxide synthase Cyclooxygenase Lipopolysaccharide Prostaglandins 



This work was supported by grants from Universidad de Buenos Aires (UBACYT M014-M021), CONICET (PIP5525), and ANPCyT (PICT 2005 N1 38283). The authors declare that there is no conflict of interest that would prejudice the impartiality of this scientific work. The authors thank Mr. Mark Stetina for critical reading of this manuscript.


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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Rocío Sanchez
    • 1
  • María E. Mercau
    • 1
  • Esteban M. Repetto
    • 1
  • Camila Martinez Calejman
    • 1
  • Francisco Astort
    • 1
  • Matías N. Perez
    • 1
  • Pablo Arias
    • 2
  • Cora B. Cymeryng
    • 1
    Email author
  1. 1.Departamento de Bioquímica Humana, Facultad de MedicinaUniversidad de Buenos Aires-CEFYBO-CONICETBuenos AiresArgentina
  2. 2.Departamento de Fisiología, Facultad de MedicinaUniversidad de RosarioRosarioArgentina

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