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Characterization of prefrontal cortex microstructure and antioxidant status in a rat model of neurodegeneration induced by aluminium chloride and multiple low-dose streptozotocin

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Abstract

Diabetes mellitus (DM) is a risk factor for Alzheimer’s disease (AD), and several individuals with AD are diabetic. Most non-transgenic animal models of AD make use of oral treatment with aluminium chloride (AlCl3) to induce brain lesions pathognomonic of the disease. Moreover, streptozotocin (STZ) can induce pathological features of either AD or DM depending on the mode of treatment. In the present study, we characterised prefrontal microanatomy and antioxidant defence system in a rat model of AD confounded by DM, with the objective of assessing the suitability of this model in the study of sporadic AD with DM co-morbidity. Adult Wistar rats were randomly assigned to receive either intraperitoneal STZ (30 mg/kg/day for 3 days; to induce DM), oral AlCl3 (500 mg/kg/day for 4 weeks; to induce some brain lesions characteristic of AD); or both STZ and AlCl3 (to induce AD with DM co-morbidity). Untreated rats served as controls. During treatment, blood glucose levels and body weights were evaluated repeatedly in all rats. At euthanasia, prefrontal cortex was homogenized in phosphate buffer solution and the supernatants assayed for some antioxidant enzymes (catalase, CAT; superoxide dismutase, SOD; and reduced glutathione, GSH). Moreover, following perfusion-fixation of the brain, frontal lobes were processed by the haematoxylin and eosin (H&E) or Congo red technique. Our findings showed that in rats co-administered AlCl3 and STZ (AD + DM rats), prefrontal levels of GSH reduced significantly (p < 0.05), while reductions in SOD and CAT were not significant (p > 0.05) compared with the controls. Moreover, in this model of AD with DM co-morbidity, extensive neuronal cell loss was observed in the prefrontal cortex, but Congophilic deposits were not present. The neurodegenerative lesions and antioxidant deficits characteristic of this AlCl3 + STZ (AD + DM) rat model were more pronounced than similar lesions associated with mono-treatment with either STZ (DM) or AlCl3 (AD) alone; and this makes the AlCl3 + STZ model a suitable option for the study of neurodegenerative diseases (such as AD) with DM co-morbidity.

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Authors and Affiliations

  1. Department of Anatomy, Faculty of Basic Medical Sciences, College of Health Sciences, University of Ilorin, Ilorin, Nigeria

    Oluwole B. Akinola, Rianat A. Adediran, Kehinde A. Adeniye & Fatimah C. Abdulquadir

  2. Chemical Pathology and Immunology, Faculty of Basic Medical Sciences, College of Health Sciences, University of Ilorin, Ilorin, Nigeria

    Sikiru A. Biliaminu

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  1. Oluwole B. Akinola
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  2. Sikiru A. Biliaminu
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  3. Rianat A. Adediran
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  5. Fatimah C. Abdulquadir
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Correspondence to Oluwole B. Akinola.

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Akinola, O.B., Biliaminu, S.A., Adediran, R.A. et al. Characterization of prefrontal cortex microstructure and antioxidant status in a rat model of neurodegeneration induced by aluminium chloride and multiple low-dose streptozotocin. Metab Brain Dis 30, 1531–1536 (2015). https://doi.org/10.1007/s11011-015-9719-4

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