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Long-Term Alternating Fasting Increases Interleukin-13 in the Gerbil Hippocampus, But Does Not Protect BBB and Pyramidal Neurons From Ischemia–Reperfusion Injury

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Abstract

It is questionable whether intermittent fasting (IF) protects against brain ischemic injury. This study examined whether IF increased anti-inflammatory cytokines and protected neurons from ischemia–reperfusion injury in the gerbil hippocampus. Gerbils were subjected to 1-day alternating fasting as IF for 1, 2, or 3 months and assigned to sham or 5 min of transient ischemia. We examined the changes in anti-inflammatory cytokines (IL-4 and IL-13), neurons and IgG by immunohistochemistry or immunofluorescence staining in the cornu ammonis 1 (CA1) region of the hippocampus before and after ischemia. IF increased IL-13 immunoreactivity in the CA1 region before ischemia, but did not affect IL-4 immunoreactivity. After ischemia, IL-13 and 4 immunoreactivities in the CA1 region were significantly lower in IF gerbils than in non-IF gerbils. In the IF gerbils, the CA1 pyramidal neurons were not protected from ischemic injury; in these gerbils, strong IgG immunoreactivity was seen in the CA1 parenchyma, indicating leakage of the BBB. In brief, IF increased IL-13 in the CA1 region, but these neurons were not protected from transient ischemic injury evidenced by IgG immunoreactivity in the CA1 parenchyma. This study indicates that IF increased some anti-inflammatory cytokines but did not afford neuroprotection against ischemic insults via BBB disruption.

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Funding

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2016R1D1A1B01011790), (NRF-2018R1D1A1B07049453) and (NRF-2017R1D1A1B03032409).

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YP, TL, MW and JA were responsible for experimental design, data analysis and manuscript review. YP, TL wrote the draft manuscript. DK, BK, CP, MS and TO carried out experiments and data collection. JL, CP, JM, JC, JP and CL performed data analysis and critical comments on the whole process of this work.

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Correspondence to Moo-Ho Won or Ji Hyeon Ahn.

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The authors have declared that there are no competing interests.

Ethical Approval

The process of handling and caring animals conformed to the guidelines from the current international laws and policies in the “NIH Guide for the Care and Use of Laboratory Animals” (The National Academies Press, 8th Ed., 2011). The protocol of this experiment was approved (Approval No. KW-180124-1) by the Institutional Animal Care and Use Committee (IACUC) at Kangwon National University.

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Lee, TK., Park, Y., Kim, B. et al. Long-Term Alternating Fasting Increases Interleukin-13 in the Gerbil Hippocampus, But Does Not Protect BBB and Pyramidal Neurons From Ischemia–Reperfusion Injury. Neurochem Res 45, 2352–2363 (2020). https://doi.org/10.1007/s11064-020-03094-z

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  • DOI: https://doi.org/10.1007/s11064-020-03094-z

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