Khadijeh Foghi; Shahriar Ahmadpour
Volume 9, Issue 1 , January 2014, , Pages 33-37
Abstract
Background and Objectives: Studies have documented the morhplogical, neurochemical and functional difference between the dorsal and ventral zones of hippocampus. The aim of this study was to assess the effects of chronic diabetes mellitus type1 on ventral and dorsal zones of hippocampus.
Methods: ...
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Background and Objectives: Studies have documented the morhplogical, neurochemical and functional difference between the dorsal and ventral zones of hippocampus. The aim of this study was to assess the effects of chronic diabetes mellitus type1 on ventral and dorsal zones of hippocampus.
Methods: Experimental diabetes was induced by stereptozotocin at a dose of 60 mg/kg. At the end of 8 weeks the brains were removed and stained by cresyl violet. The number of dark neurons in CA1 and CA3 regions of dorsal and ventral zones of hippocampus was counted by modified stereological method.
Results: The number of dead neurons in CA3 ventral showed significant level of difference (P<0.05) in comparison to CA3 dorsal. The number of dead neurons in CA1 ventral and CA1 dorsal showed also significant difference (P<0.05)
Conclusion: The results of our study indicative of more vulnerability of ventral zones the dorsal zone of hippocampus to diabetes mellitus type 1.
Shahriar Ahmadpour; Hossein Haghir; Yousef Sadeghi
Volume 3, Issue 1 , January 2008, , Pages 1-4
Abstract
Background and Objectives: Hippocampal volume reduction has been reported in diabetes mellitus type 1. It is believed that hyperglycemia and oxidative stress mediate neuropathological changes in hippocampal neurons. In this study we aimed to study the effect of insulin and an antioxidant like ...
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Background and Objectives: Hippocampal volume reduction has been reported in diabetes mellitus type 1. It is believed that hyperglycemia and oxidative stress mediate neuropathological changes in hippocampal neurons. In this study we aimed to study the effect of insulin and an antioxidant like ascorbic acid on preventing volume changes of dentate gyrus and CA3 region of hippocampus. Materials and Methods: This study was carried out on male Wistar rats. Experimental diabetes was induced by intraperitoneal injection of streptozotocin (80 mg/kg). Control animals (C) received only saline. Six weeks later diabetic rats were divided into four groups as follows: diabetic (D), diabetic/insulin (D/Ins), diabetic/insulin + ascorbic acid (D/Ins+AA), and diabetic/ascorbic acid (D/AA). Treatments were continued for two weeks. At the end of treatment course, the hippocampi were removed and dentate gyrus and CA3 region volumes were measured using Cavalieri principle. Results: STZ diabetic rats showed a reduction in DG and CA3 volumes. The volume of DG and CA3 in D and D/AA groups showed a reduction in comparison with control group (p<0.01). However, the volumes of DG and CA3 in groups D/Ins and D/Ins+AA showed no significant difference related to control group (p>0.05). Conclusion: Our findings showed that insulin administration reverse volume reduction of dentate and CA3 region.
