Journal of Neural Transmission

, Volume 122, Issue 4, pp 577–592

Staging of cognitive deficits and neuropathological and ultrastructural changes in streptozotocin-induced rat model of Alzheimer’s disease

  • Ana Knezovic
  • Jelena Osmanovic-Barilar
  • Marija Curlin
  • Patrick R. Hof
  • Goran Simic
  • Peter Riederer
  • Melita Salkovic-Petrisic
Neurology and Preclinical Neurological Studies - Original Article

DOI: 10.1007/s00702-015-1394-4

Cite this article as:
Knezovic, A., Osmanovic-Barilar, J., Curlin, M. et al. J Neural Transm (2015) 122: 577. doi:10.1007/s00702-015-1394-4

Abstract

Sporadic Alzheimer’s disease (sAD) is the most common form of dementia. Rats injected intracerebroventricularly with streptozotocin (STZ-icv) develop insulin-resistant brain state and represent a non-transgenic sAD model with a number of AD-like cognitive and neurochemical features. We explored cognitive, structural and ultrastructural changes in the brain of the STZ-icv rat model over a course of 9 months. Cognitive functions were measured in the STZ-icv- (0.3, 1 and 3 mg/kg) and age-matched control rats by passive avoidance test. Structural changes were assessed by Nissl and Bielschowsky silver staining. Immunohistochemistry and electron microscopy analysis were used to detect amyloid β- (Aβ1-42) and hyperphosphorylated tau (AT8) accumulation and ultrastructural changes in the brain. Memory decline was time- (≤3 months/acute, ≥3 months/progressive) and STZ-icv dose-dependent. Morphological changes were manifested as thinning of parietal cortex (≥1 month) and corpus callosum (9 months), and were more pronounced in the 3 mg/kg STZ group. Early neurofibrillary changes (AT8) were detected from 1 month onward in the neocortex, and progressed after 3 months to the hippocampus. Intracellular Aβ1-42 accumulation was found in the neocortex at 3 months following STZ-icv treatment, while diffuse Aβ1-42-positive plaque-like formations were found after 6 months in the neocortex and hippocampus. Ultrastructural changes revealed enlargement of Golgi apparatus, pyknotic nuclei, and time-dependent increase in lysosome size, number, and density. Our data provide a staging of cognitive, structural/ultrastructural, and neuropathological markers in the STZ-icv rat model that in many aspects seems to be generally comparable to stages seen in human sAD.

Keywords

Alzheimer’s disease Streptozotocin Amyloid protein Tau protein Lysosomes Cognitive decline 

Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  • Ana Knezovic
    • 1
  • Jelena Osmanovic-Barilar
    • 1
  • Marija Curlin
    • 2
  • Patrick R. Hof
    • 3
  • Goran Simic
    • 4
  • Peter Riederer
    • 5
  • Melita Salkovic-Petrisic
    • 1
  1. 1.Department of Pharmacology and Croatian Institute for Brain ResearchUniversity of Zagreb School of MedicineZagrebCroatia
  2. 2.Department of Histology and Croatian Institute for Brain ResearchUniversity of Zagreb School of MedicineZagrebCroatia
  3. 3.Fishberg Department of Neuroscience and Friedman Brain InstituteIcahn School of Medicine at Mount SinaiNew YorkUSA
  4. 4.Department of Neuroscience, Croatian Institute for Brain ResearchUniversity of Zagreb School of MedicineZagrebCroatia
  5. 5.Center of Psychic Health, Clinic and Policlinic for Psychiatry and PsychotherapyUniversity Hospital WürzburgWürzburgGermany

Personalised recommendations