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Psychopharmacology

, Volume 231, Issue 24, pp 4711–4722 | Cite as

Effects of corticotrophin-releasing factor receptor 1 antagonists on amyloid-β and behavior in Tg2576 mice

  • Hongxin DongEmail author
  • Shirlene Wang
  • Ziling Zeng
  • Fei Li
  • Janitza Montalvo-Ortiz
  • Christopher Tucker
  • Shahzad Akhtar
  • Jingshan Shi
  • Herbert Y. Meltzer
  • Kenner C. Rice
  • John G. Csernansky
Original Investigation

Abstract

Rationale

Previous studies indicate that psychosocial stressors could accelerate amyloid-β (Aβ) levels and accelerate plaque deposition in mouse models of Alzheimer disease (AD). Stressors enhanced the release of corticotrophin-releasing factor (CRF), and exogenous CRF administration mimicked the effects of stress on Aβ levels in mouse models of AD. However, whether CRF receptor 1 (CRF1) antagonists could influence the stress-induced acceleration of an AD-like process in mouse models has not been well studied.

Objective

We sought to examine whether CRF1 antagonists inhibit the effects of isolation stress on tissue Aβ levels, Aβ plaque deposition, and behaviors related to anxiety and memory in Tg2576 mice, and to investigate the molecular mechanism underlying such effects.

Methods

Cohorts of Tg2576 mouse pups were isolated or group-housed at 21 days of age, and then the subgroups of these cohorts received daily intraperitoneal injections of the CRF1 antagonists, antalarmin or R121919 (5, 10, and 20 mg/kg), or vehicle for 1 week. Other cohorts of Tg2576 mouse pups were isolated or group-housed at 21 days of age, and then at 4 months of age, subgroups of these mice were administered antalarmin (20 mg/kg) or vehicle in their drinking water for 6 months. Finally, cultured primary hippocampal neurons from regular Tg2576 pups (P0) were incubated with CRF (0.1, 1, and 10 nM), antalarmin (100 nM) or H-89 (1 μM) for 48 h. Brain tissues or cultured neurons were collected for histological and biochemical analyses, and behavioral measures were collected in the cohorts of mice that were chronically stressed.

Results

Administration of antalarmin at 20 mg/kg dose for 1 week significantly reduced Aβ1-42 levels in isolation stressed mice. Administration of antalarmin for 6 months significantly decreased plasma corticosterone levels, tissue Aβ1-42 levels, and Aβ plaque deposition in the brain and blocked the effects of isolation stress on behaviors related to anxiety and memory. Finally, incubation of neurons with 100 nM antalarmin inhibited the ability of 10 nM CRF to increase Aβ1-42 levels and protein kinase A IIβ expression. The effect of CRF1 on Aβ1-42 levels was also diminished by treatment with H-89, a c-AMP/PKA inhibitor.

Conclusions

These results suggest that CRF1 antagonists can slow an AD-like process in Tg2576 mice and that the c-AMP/PKA signaling pathway may be involved in this effect.

Keywords

Stress Corticotrophin-releasing hormone Antalarmin R121919 Alzheimer disease Tg2576 mice 

Notes

Acknowledgments

This work was supported by the Alzheimer's Drug Discovery Foundation (grant 20111208, JGC). A portion of this research was supported by the Intramural Research Programs of the National Institute on Drug Abuse and the National Institute of Alcohol Abuse and Alcoholism, NIH, US Department of Health and Human Services (KCR). Drs. Csernansky and Dong have received research grants from the NIMH, NIA, and Dr. John G. Csernansky has served as a Data Safety and Monitoring Board (DSMB) member for Eli Lilly and Sanofi-Aventis and has received funding for his research from Genentech. The rest of the authors declare that they have no competing financial interests.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Hongxin Dong
    • 1
    • 3
    Email author
  • Shirlene Wang
    • 1
  • Ziling Zeng
    • 2
  • Fei Li
    • 3
  • Janitza Montalvo-Ortiz
    • 1
  • Christopher Tucker
    • 4
  • Shahzad Akhtar
    • 4
  • Jingshan Shi
    • 3
  • Herbert Y. Meltzer
    • 1
  • Kenner C. Rice
    • 5
  • John G. Csernansky
    • 1
  1. 1.Department of Psychiatry and Behavioral Sciences, Feinberg School MedicineNorthwestern UniversityChicagoUSA
  2. 2.Department of Healthcare, Shandong Provincial HospitalShandong UniversityJinanChina
  3. 3.Department of PharmacologyZunyi Medical CollegeZunyiChina
  4. 4.Drug Discovery ResearchAstella Pharma Global Development, Inc.SkokieUSA
  5. 5.National Institute on Drug Abuse, and National Institute Alcohol Abuse and Alcoholism Intramural Research ProgramRockvilleUSA

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