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Journal of Molecular Histology

, Volume 40, Issue 5–6, pp 379–385 | Cite as

Protective effects of the volatile oil of Nigella sativa seeds on β-cell damage in streptozotocin-induced diabetic rats: a light and electron microscopic study

  • Mehmet Kanter
  • Meryem Akpolat
  • Cevat Aktas
Original Paper

Abstract

The aim of this study was to evaluate the possible protective effects of the volatile oil of Nigella sativa (NS) seeds on insulin immunoreactivity and ultrastructural changes of pancreatic β-cells in STZ-induced diabetic rats. STZ was injected intraperitoneally at a single dose of 50 mg/kg to induce diabetes. The rats in NS treated groups were given NS (0.2 ml/kg) once a day orally for 4 weeks starting 3 days prior to STZ injection. To date, no ultrastructural changes of pancreatic β-cells in STZ induced diabetic rats by NS treatment have been reported. Islet cell degeneration and weak insulin immunohistochemical staining was observed in rats with STZ-induced diabetes. Increased intensity of staining for insulin, and preservation of β-cell numbers were apparent in the NS-treated diabetic rats. The protective effect of NS on STZ-diabetic rats was evident by a moderate increase in the lowered secretory vesicles with granules and also slight destruction with loss of cristae within the mitochondria of β-cell when compared to control rats. These findings suggest that NS treatment exerts a therapeutic protective effect in diabetes by decreasing morphological changes and preserving pancreatic β-cell integrity. Consequently, NS may be clinically useful for protecting β-cells against oxidative stress.

Keywords

Nigella sativa Immunoreactivity Ultrastructure β-cell Experimental diabetes 

Notes

Acknowledgment

This study was supported as Project 855 by Trakya University Research Center, Edirne, Turkey.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Department of Histology and Embryology, Faculty of MedicineTrakya UniversityEdirneTurkey

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