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Journal of Neuroimmune Pharmacology

, Volume 14, Issue 2, pp 251–262 | Cite as

Age-Induced Spatial Memory Deficits in Rats Are Correlated with Specific Brain Region Alterations in Microglial Morphology and Gene Expression

  • Shai Shoham
  • Michal Linial
  • Marta WeinstockEmail author
ORIGINAL ARTICLE
  • 315 Downloads

Abstract

Effect of age and ladostigil treatment (1 mg/kg/day), given for 6 months to 16 month old rats, was investigated on microglial morphology in brain regions associated with control of spatial learning. This was assessed in the Morris water maze (MWM). Microglial morphology was assessed with diaminobenzidine and fluorescent staining with Iba1 and CD11b in these brain regions. Aging did not change the number of microglia in the parietal cortex (PC) or hippocampal CA1 region (CA1-HC), but decreased microglial process tips in the CA1-HC, increased the area fraction stained by CD11b and number of bulbs on processes in PC and CA1-HC and thickness of microglial processes in corpus callosum (CC) and fornix (Fx). Performance in MWM (distance swam to escape platform) was negatively correlated with number of bulbs in PC and thickness of process in CC, and positively correlated with number of process tips in CA1-HC. Aging increased expression of MHC class II genes and others associated with motility and membrane adhesion in the PC and hippocampus, but Adora2a (Adenosine A2a receptor), only in hippocampus. Age-related increase in the number of bulbs and expression of inflammatory genes was prevented by ladostigil in PC. In the CA1-HC, ladostigil increased the number of process tips and prevented the increase in expression of Adora2a and genes regulating ion channels. Ladostigil also decreased thickening of the processes in CC and Fx. The data show brain region-specific relations induced by age in spatial learning, microglial morphology and associated genes and their response to ladostigil treatment.

Graphical Abstract

Keywords

Hippocampus KEGG pathway Microglial morphology Parietal cortex RNA-Seq 

Abbreviations

CA1-HC

hippocampal CA1 region

CC

corpus callosum

DAB

diaminobenzidine

FPKM

Fragments per kilobase million

Fx

fornix

HC

hippocampus

Iba1

Ionized calcium binding adaptor molecule 1 protein

MWM

Morris water maze

PC

parietal cortex

Notes

Acknowledgements

We gratefully acknowledge the help given by Netanel Dwolatzky, Ayelet Gottstein and Coral Haddad in performing the microglial measurements, Tsiona Eliyahu for RNA preparation for sequencing and Amos Stern for data analysis.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors, but was supported by research funds of MW at the Hebrew University.

Compliance with Ethical Standards

Conflicts of Interest

The authors declare no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.The Institute for Drug Research, School of PharmacyThe Hebrew University of JerusalemJerusalemIsrael
  2. 2.Department of Biological Chemistry, Life Science InstituteThe Hebrew University of JerusalemJerusalemIsrael

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