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Endocrine

, Volume 63, Issue 3, pp 602–614 | Cite as

Impaired HPA axis function in diabetes involves adrenal apoptosis and phagocytosis

  • Esteban M. RepettoEmail author
  • Morena Wiszniewski
  • Ana L. Bonelli
  • Carolina V. Vecino
  • Camila Martinez Calejman
  • Pablo Arias
  • Cora B. Cymeryng
Original Article
  • 129 Downloads

Abstract

Purpose

The aim of the present study was to analyze the involvement of oxidative stress and inflammation in the modulation of glucocorticoid production in the adrenal cortex of diabetic rats.

Methods

Male Wistar rats were treated with or without streptozotocin (STZ, an insulinopenic model of diabetes) and either α-lipoic (90 mg/kg ip.), α-tocopherol (200 mg/kg po.) or with STZ and supplemented with insulin (STZ + INS: 2.5U/day) for 4 weeks. Oxidative/nitrosative stress parameters and antioxidant enzymes were determined in adrenocortical tissues. Apoptosis and macrophage activation were evaluated by immunohistochemistry (TUNEL and ED1+). Basal and ACTH-stimulated corticosterone production were assessed by RIA and plasma ACTH levels were determined by an immunometric assay.

Results

Diabetic rats showed a diminished response to exogenous ACTH stimulation along with higher basal corticosterone and lower plasma ACTH levels. In the adrenal cortex we determined an increase in the levels of lipoperoxides, S-nitrosothiols, nitric oxide synthase activity and nitro-tyrosine modified proteins while catalase activity and heme oxygenase-1 expression levels were also elevated. Antioxidant treatments were effective in the prevention of these effects, and in the increase in the number of apoptotic and phagocytic (ED1+) cells detected in diabetic rats. No changes were observed in the STZ + INS group.

Conclusions

Generation of oxidative/nitrosative stress in the adrenal cortex of diabetic rats leads to the induction of apoptosis and the activation of adrenocortical macrophages and is associated with an elevated basal corticosteronemia and the loss of the functional capacity of the gland.

Keywords

Diabetes Oxidative stress Apoptosis HPA dysfuntion α-tocopherol α-lipoic acid 

Notes

Acknowledgements

The authors want to thank Dr. Silvia Sanchez Puch for the invaluable technical support.

Funding

This work was supported by grants from ANPCyT (PICT 2008 N°1034), CONICET (PIP11220120100257) and UBA (UBACYT 20020130100115BA-UBACYT 20020150200065BA).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

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Supplementary Information
12020_2018_1755_MOESM2_ESM.docx (21 kb)
Supplementary Information

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Authors and Affiliations

  1. 1.Departamento de Bioquímica Clínica, Facultad de Farmacia y BioquímicaUniversidad de Buenos AiresBuenos AiresArgentina
  2. 2.Facultad de Medicina, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de Estudios Farmacológicos y Botánicos (CEFYBO), Laboratorio de Endocrinología Molecular (LEM)Universidad de Buenos AiresBuenos AiresArgentina
  3. 3.Departamento de Fisiología, Facultad de MedicinaUniversidad Nacional de RosarioRosarioArgentina
  4. 4.Departamento de Bioquímica Humana, Facultad de MedicinaUniversidad de Buenos AiresBuenos AiresArgentina

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