Arcuate nucleus neurons are not essential for the preprandial peak in plasma ghrelin after neonatal monosodium glutamate treatment

Li,Qing‑Chun; Li,Qing‑Feng; Wang,Yan‑Lin; Sun,Hong‑Liang; Jiang,Zheng‑Yao

doi:10.3892/ijmm.2018.3365

Arcuate nucleus neurons are not essential for the preprandial peak in plasma ghrelin after neonatal monosodium glutamate treatment

Authors:
- Qing‑Chun Li
- Qing‑Feng Li
- Yan‑Lin Wang
- Hong‑Liang Sun
- Zheng‑Yao Jiang
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Affiliations: Department of Reproductive Medicine, The Affiliated Hospital of Binzhou Medical University, Binzhou, Shandong 256603, P.R. China, Smart Division Gas, Qingdao iESLab Electronic Co., Ltd., Qingdao 266071, P.R. China, Department of Physiology, Qingdao University Medical College, Qingdao, Shandong 266071, P.R. China
Published online on: January 5, 2018 https://doi.org/10.3892/ijmm.2018.3365
Pages: 1635-1642

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Abstract

The aim of the present study was to determine whether arcuate nucleus (ARC) lesions affect the ghrelin level in the plasma and the stomach in monosodium glutamate (MSG)‑treated mice. The aim of the present study was to investigate whether the ARC was destroyed in mice treated neonatally with MSG, and whether the ARC lesions affect the ghrelin level in the plasma and lipid mobilization in MSG‑treated mice. The results revealed that MSG led to a marked reduction in ARC cresyl violet staining, tyrosine hydroxylase-immunoreactive (IR) neurons and neuropeptide Y‑IR fibers, compared with saline controls. MSG‑treated mice exhibited significantly increased body mass compared with saline controls, and MSG treatment did not prevent food deprivation‑induced decrease in white adipose tissue mass compared with controls. Plasma ghrelin levels were significantly increased in MSG‑treated mice that were fasted for 48 h, compared with the levels prior to fasting and re‑feeding, and the preprandial peak of plasma ghrelin persisted in MSG‑treated mice. In summary, the ARC was not found to be essential for food deprivation‑induced lipid mobilization and preprandial peak in MSG‑treated mice. However, this finding does not mean that ARC neurons do not contribute to food sensing and lipid mobilization under normal conditions, as compensatory mechanisms may have emerged after the ablation of ARC neurons.

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