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Cinnamaldehyde Regulates Insulin and Caspase-3 Signaling Pathways in the Sporadic Alzheimer’s Disease Model: Involvement of Hippocampal Function via IRS-1, Akt, and GSK-3β Phosphorylation

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Abstract

Insulin signaling disruption and caspase-3 cleavage play a pathologic role in Alzheimer’s disease (AD). Evidence suggested that cinnamaldehyde (Cin), the major component of cinnamon, has the ability to act as a neuroprotective agent. However, little evidence is available to demonstrate its effectiveness in regulating the insulin and caspase-3 signaling pathways and underlying molecular mechanisms. Therefore, the present study was conducted to correlate the molecular mechanisms of these signaling pathways and Cin treatment on animal behavioral performance in an intracerebroventricular (ICV)-streptozotocin (STZ, 3 mg/kg) model. The sporadic AD rat model was treated with Cin (10 and 100 mg/kg; intraperitoneal, i.p) daily for 2 weeks. Novel object recognition (NOR), Morris water maze (MWM), and elevated plus maze (EPM) tests were performed to assess recognition/spatial memory and anxiety-like behavior, respectively. Hippocampal Aβ aggregation was assessed using Congo red staining. The activity of hippocampal caspase-3 and IRS-1/Akt/GSK-3β signaling pathways were analyzed using the Western blot technique. The results revealed that Cin (100 mg/kg, effective dose) improved recognition/spatial memory deficits and anxiety-like behavior. In addition, Cin negated the effects of STZ on Aβ aggregation and caspase-3 cleavage in the hippocampus. Furthermore, the Western blot method showed that hippocampal IRS-1/AKT/GSK-3β phosphorylation was altered in ICV-STZ animal model, while Cin modulated this signaling pathway through decreasing Phospho.IRS-1Ser307/Total.IRS-1 ratio and also increasing Phospho.AktSer473/Total.Akt and Phospho.GSK-3βSer9/Total.GSK-3β ratios. These findings suggest that Cin is involved in the regulation of hippocampal IRS-1/AKT/GSK-3β and caspase-3 pathways in a sporadic AD model, and modulation of these signaling pathways also influences the animal behavioral performance.

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Data Availability

The data that support the finding of this study are available from the senior author (rghasemi60@sbmu.ac.ir) upon reasonable request.

Abbreviations

AD:

Alzheimer’s disease

i.p:

Intraperitoneal

Aβ:

Amyloid-β

ICV:

Intracerebroventricular

STZ:

Streptozotocin

MWM:

Morris water maze

NOR:

Novel object recognition

EPM:

Elevated plus maze

IR:

Insulin receptor

IRS:

Insulin receptor substrate

PI3K:

Phosphoinositide 3-kinase

Akt:

A serine/threonine protein kinase

IGF:

Insulin-like growth factor

GSK-3:

Glycogen synthase kinase-3

Cin:

Cinnamaldehyde

HRP:

Horseradish peroxidase

ECL:

Enhanced chemiluminescence

PVDF:

Polyvinylidene difluoride

PBS:

Phosphate buffer saline

OAT:

Open arm time

CAT:

Close arm time

OAE:

Open arm entry

CAE:

Close arm entry

Q:

Quadrant

LN2 :

Liquid nitrogen

DG:

Dentate gyrus

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Acknowledgements

This paper has been extracted from the Ph.D thesis (Dissertation, Medical physiology) written by Dr. Saeid Bagheri-Mohammadi in School of Medicine, Shahid Beheshti University of Medical Sciences (Registration number: 260) and supported by a Grant (Number: 25205) from Deputy of Research and Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Funding

This work was supported by a Grant (Number: 25205) from Deputy of Research and Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

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Authors and Affiliations

Authors

Contributions

Saeid Bagheri-Mohammadi: conceptualization, methodology, formal analysis, investigation, resources, validation, writing —review and editing. Rasoul Ghasemi: providing the complete research project, conceptualization, supervision, methodology, formal analysis, investigation, resources, validation, project administration, writing—review and editing. Maryam Moosavi: supervision, investigation, resources, validation, project administration, review and editing. Sahar Askari: validation, review and editing;. Behrang Alani: supervision, resources, project administration, and review and editing.

Corresponding authors

Correspondence to Maryam Moosavi or Rasoul Ghasemi.

Ethics declarations

Ethics Approval

All of the experimental procedures were approved by the Ethical Committee for Research at Shahid Beheshti University of Medical Sciences (ID: IR.SBMU.MSP.REC.1399.385).

Conflict of Interest

The authors declare no competing interests.

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Highlights

• This study investigated the molecular mechanism of hippocampal insulin signaling pathway and cinnamaldehyde treatment on behavioral performance in sporadic Alzheimer's disease model.

• Treatment with cinnamaldehyde ameliorated the STZ-induced recognition/spatial memory impairment.

• Central microinjection of STZ increased anxiety-like behavior, which was reversed by the administration of cinnamaldehyde.

• Cinnamaldehyde attenuates hippocampal Aβ aggregation induced by central microinjection of STZ.

• Cinnamaldehyde prevented cleavage of hippocampal caspase-3 in a sporadic Alzheimer's disease animal model.

• Cinnamaldehyde prevented hippocampal IRS-1, AKT, and GSK-3β signaling disruption induced by central microinjection of STZ.

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Bagheri-Mohammadi, S., Askari, S., Alani, B. et al. Cinnamaldehyde Regulates Insulin and Caspase-3 Signaling Pathways in the Sporadic Alzheimer’s Disease Model: Involvement of Hippocampal Function via IRS-1, Akt, and GSK-3β Phosphorylation. J Mol Neurosci 72, 2273–2291 (2022). https://doi.org/10.1007/s12031-022-02075-x

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  • DOI: https://doi.org/10.1007/s12031-022-02075-x

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