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Effect of dantrolene on lipid peroxidation, glutathione and glutathione-dependent enzyme activities in experimental otitis media with effusion in guinea pigs

Department of Otorhinolaryngology-Head and Neck Surgery, Ataturk University, Medical School, Erzurum, Turkey

S Taysi

Department of Biochemistry, Nenehatun Obstetric and Gynecology Hospital, Erzurum, Turkey; Nenehatun Kadin Dogum Hastanesi Çat yolu, Biyokimya Laboratuvar1, Erzurum, Turkeyseytaysi{at}hotmail.com

B Aktan

Department of Otorhinolaryngology-Head and Neck Surgery, Ataturk University, Medical School, Erzurum, Turkey

M E Buyukokuroglu

Department of Pharmacology, Afyon Kocatepe University, Medical School, Afyonkarahisar, Turkey

M Elmastas

Department of Chemistry, Gaziosmanpasa University, Science and Art Faculty, Tokat, Turkey

The aims of our study were to assess whether the increased oxidative stress in experimental otitis media with effusion (OME) induced by histamine was reflected in erythrocytes and middle ear effusion fluid by lipid peroxidation; to survey the alterations in antioxidant enzyme activities in experimental OME; and to determine the effect of dantrolene on this oxidative stress. Erythrocyte and middle ear effusion malondialdehyde (MDA) level, erythrocyte glutathione (GSH) and glutathione peroxidase (GSH-Px), glutathione reductase (GRD) and glutathione-S-transferase (GST) activities were measured in three groups of seven guinea pigs, 3 hours after injection of 0.1 mL of histamine (or saline) into the middle ear in guinea pigs with OME (experimental group), in a dantrolene sodium group and in a control group.

Erythrocyte and effusion MDA levels in the dantrolene group were significantly lower than those of the experimental group. Erythrocyte GSH-Px, GST, GRD activities, and GSH levels were significantly higher in the dantrolene group than in the experimental group. Dantrolene sodium decreased the erythrocyte and effusion MDA levels, on the other hand, it increased the GSH and GSH-dependent enzymes.

These findings suggest that reactive oxygen species (ROS) play a role in histamine-induced OME. Pretreatment with dantrolene sodium increases antioxidant enzymes activities and decreases formation of MDA, the indicator of lipid peroxidation, in histamine induced OME.

Key Words: dantrolene sodium • glutathione • malondialdehyde • otitis media with effusion • oxidative stress

Human & Experimental Toxicology, Vol. 24, No. 11, 567-571 (2005)
DOI: 10.1191/0960327105ht569oa


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