Evaluation of the Long-term Effects of Oleum Origani on the Toxicity Induced by Administration of Streptozotocin in Rats

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Abstract
Oleum origani, the essential oil of Origanum onites L., is a traditional plant material used in Turkey for the treatment of several diseases, including diabetes mellitus. This study has evaluated the effect of oleum origani on streptozotocin-induced tissue injury and haematological changes. The effect of oleum origani on glycaemia was also studied. Long-term administration of oleum origani resulted in significant improvement of tissue injury induced by streptozotocin treatment. No effect on blood glucose levels was detected. In addition, any visible toxicity or disturbance of haematological parameters and tissue structure attributable to the long-term use of oleum origani were not established in normal rats. The data indicate that long-term use of oleum origani might be effective in preventing or at least in retarding the development of some complications of diabetes mellitus. Further investigation is required to determine the underlying mechanism(s) of the protective effect against tissue injury induced by streptozotocin-treatment of rats.