Augmented Brain Infiltration and Activation of Leukocytes After Cerebral Ischemia in Type 2 Diabetic Mice

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Authors

External Institution(s)

  • Harvard University
  • Nanjing University
  • Tulane University
  • Zhengzhou University
  • Tianjin Medical University

Details

Original languageEnglish (US)
Article number2392
JournalFrontiers in Immunology
Volume10
StatusPublished - Oct 11 2019
Peer-reviewedYes

Abstract

Background: Stroke patients with diabetes suffer from higher mortality rate and worsened neurological outcome. However, the responses of immune system to cerebral ischemia in the setting of diabetes remain poorly understood. Methods: In this study, we investigated the temporal profile of leukocyte mobilization and brain infiltration following distal middle cerebral artery occlusion (dMCAO) in db/db mouse model of type 2 diabetes (T2D) and its db/+ normoglycemic controls. Results: We found a significant increase of brain-infiltrating CD4+ T cell at day 3 after dMCAO, and a delayed and dramatic increase of brain-infiltrating neutrophils, CD4+ T cells, CD8+ T cells, and B cells at day 7 after dMCAO in db/db mice vs. db/+ controls. Leukocyte subsets in the circulation and spleen were also measured, however, there is no significant difference between non-diabetic and diabetic groups. Furthermore, we identified an increased expression of activation marker CD69 in brain-infiltrating neutrophils, CD4+ T and CD8+ T cells, and IFN-γ in brain-infiltrating CD4+ T cells in db/db mice at day 7 after dMCAO. Conclusions: These findings for the first time demonstrate that cerebral ischemia induces a delayed and sustained augmentation of brain infiltration and activation of neutrophils and lymphocytes in type 2 diabetic mice and these altered immune responses might contribute to the severer brain tissue damage and worse neurological outcomes of diabetes stroke, which warrants further investigation.

    Research areas

  • db/db type 2 diabetes mice, diabetes mellitus, distal middle cerebral artery occlusion, immune system, ischemic stroke, leukocyte brain infiltration, leukocyte mobilization

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