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Protective effects of tetramethylpyrazine on dysfunction of the locus coeruleus in rats exposed to single prolonged stress by anti-ER stress mechanism

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Abstract

Post-traumatic stress disorder (PTSD) is a serious stress-related neuropsychiatric disorder caused by major traumatic events. Abnormal activity of the locus coeruleus (LC)-noradrenergic system is related to the development of PTSD-like symptoms. Our previous studies have indicated that endoplasmic reticulum (ER) stress induced neuronal apoptosis of LC in rats with PTSD. The purpose of this study was to further investigate the role of ER stress pathways in LC neuronal dysfunction and elucidate the effect of the bioactive component tetramethylpyrazine (TMP) against ER stress response. We used an acute exposure to single prolonged stress (SPS) to model PTSD in rats. There were higher norepinephrine (NE) levels in the brain, increased tyrosine hydroxylase expression in LC, and enhanced anxiety-like behaviors in rats exposed to SPS, which were observed by enzyme-linked immunosorbent assay, western blot analysis and elevated plus maze test, respectively. In addition, the three major pathways of ER stress were activated by SPS exposure, which may be involved in the dysregulation of the LC-noradrenergic system of rats with PTSD. Furthermore, we found that TMP administration significantly suppressed the increased responsiveness of LC-noradrenergic system, effectively reduced the anxiety response of SPS rats, and selectively attenuated the activation of pro-apoptotic ER stress pathways. The results suggest that TMP was efficient in improving the LC-NE dysfunction induced by excessive ER stress. TMP exhibited a significant neuroprotective effect and potential therapeutics on PTSD-like symptoms.

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Abbreviations

4-PBA:

4-Phenylbutyric acid

ASK1:

Apoptosis signal-regulating kinase 1

ATF4:

Activating transcription factor 4

ATF6:

Activating transcription factor 6

CHOP:

CCAAT/enhancer-binding protein-homologous protein

eIF2α:

Eukaryotic translation initiation factor 2α

EPM:

Elevated plus maze

ER:

Endoplasmic reticulum

GRP78:

78-KDa glucose-regulated protein

IRE1α:

Inositol-requiring enzyme 1α

JNK:

C-Jun N-terminal kinase

LC:

Locus coeruleus

NE:

Norepinephrine

PERK:

Protein kinase RNA-like ER kinase

PTSD:

Post-traumatic stress disorder

SPS:

Single prolonged stress

TH:

Tyrosine hydroxylase

TMP:

Tetramethylpyrazine

TRAF2:

Tumor necrosis factor receptor–associated factor 2

UPR:

Unfolded protein response

XBP1:

X-box-binding protein 1

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Acknowledgements

We would like to thank T. Liu, H. Li, and D. Wang for the technical assistance.

Funding

This work was supported by the financial grants from the Natural Science Foundation of Shaanxi Province, China (2020JM-328); the key Research and Development Program of Shandong Province, China (2018GSF118129); the Science and Technology Development Plan of Chinese Medicine of Shandong Province, China (2017–234); the National Natural Science Foundation of China (81701301); the Natural Science Foundation of Shandong Province, China (ZR2018PH017); the 2019 National Undergraduate Innovation and Entrepreneurship Training Program, China (201910440007), and the 2018 Binzhou Medical University Undergraduate Innovation and Entrepreneurship Training Program, China (201810440136).

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WZ, YH, and YJ designed the study and provided technical guidance. CX and KW performed the study and acquired the data. FX and SL analyzed the data. WZ and ML wrote the manuscript. All authors reviewed and approved the final manuscript.

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Correspondence to Wei Zhao.

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The authors declare no competing interests.

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Yun Hou, Meifeng Li and Yinchuan ** These authors contributed equally to this work

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Hou, Y., Li, M., **, Y. et al. Protective effects of tetramethylpyrazine on dysfunction of the locus coeruleus in rats exposed to single prolonged stress by anti-ER stress mechanism. Psychopharmacology 238, 2923–2936 (2021). https://doi.org/10.1007/s00213-021-05908-6

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