The TNFα-transgenic rat: Hippocampal synaptic integrity, cognition, function, and post-ischemic cell loss

L. Creed Pettigrew; Richard J. Kryscio; Christopher M. Norris

doi:10.1371/journal.pone.0154721

The TNFα-transgenic rat: Hippocampal synaptic integrity, cognition, function, and post-ischemic cell loss

L. Creed Pettigrew, Richard J. Kryscio, Christopher M. Norris

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

The cytokine, tumor necrosis factor α (TNFα), is a key regulator of neuroinflammation linked to numerous neurodegenerative conditions and diseases. The present study used transgenic rats that overexpress a murine TNFα gene, under the control of its own promoter, to investigate the impact of chronically elevated TNFα on hippocampal synaptic function. Neuronal viability and cognitive recovery in TNFα Tg rats were also determined following an ischemic insult arising from reversible middle cerebral artery occlusion (MCAO). Basal CA3-CA1 synaptic strength, recorded in acute brain slices, was not significantly different between eight-week-old TNFα Tg rats and non-Tg rats. In contrast, slices from TNFα Tg rats showed significantly greater levels of long-term potentiation (LTP) in response to 100 Hz stimulation, suggesting that synaptic networks may be hyperexcitable in the context of elevated TNFα. Cognitive and motor deficits (assessed on the Morris Water Maze and Rotarod task, respectively) were present in TNFα Tg rats in the absence of significant differences in the loss of cortical and hippocampal neurons. TNF overexpression exacerbated MCAO-dependent deficits on the rotarod, but ameliorated cortical neuron loss in response to MCAO.

Original language	English
Article number	e0154721
Journal	PLoS ONE
Volume	11
Issue number	5
DOIs	https://doi.org/10.1371/journal.pone.0154721
State	Published - May 2016

Bibliographical note

Publisher Copyright:
© 2016 Pettigrew et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Funding

Funding: NIH/NINDS grant R01 NS047395 and a McGeorge Neurological and Spinal Cord Grant awarded through the Research & Development Office, Lexington VA Medical Center, Lexington, Kentucky (L.C.P.). NIH/NIA grant R01 AG027297 and a Kentucky Spinal Cord and Head Injury Research Trust Award 12-10A (C.M.N.).

Funders	Funder number
McGeorge Neurological
NIA/NIH	R01 AG027297, 12-10A
NIH/NINDS	R01 NS047395
Institute of Neurological Disorders and Stroke National Advisory Neurological Disorders and Stroke Council	R01NS047395
Institute of Neurological Disorders and Stroke National Advisory Neurological Disorders and Stroke Council

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abstract = "The cytokine, tumor necrosis factor α (TNFα), is a key regulator of neuroinflammation linked to numerous neurodegenerative conditions and diseases. The present study used transgenic rats that overexpress a murine TNFα gene, under the control of its own promoter, to investigate the impact of chronically elevated TNFα on hippocampal synaptic function. Neuronal viability and cognitive recovery in TNFα Tg rats were also determined following an ischemic insult arising from reversible middle cerebral artery occlusion (MCAO). Basal CA3-CA1 synaptic strength, recorded in acute brain slices, was not significantly different between eight-week-old TNFα Tg rats and non-Tg rats. In contrast, slices from TNFα Tg rats showed significantly greater levels of long-term potentiation (LTP) in response to 100 Hz stimulation, suggesting that synaptic networks may be hyperexcitable in the context of elevated TNFα. Cognitive and motor deficits (assessed on the Morris Water Maze and Rotarod task, respectively) were present in TNFα Tg rats in the absence of significant differences in the loss of cortical and hippocampal neurons. TNF overexpression exacerbated MCAO-dependent deficits on the rotarod, but ameliorated cortical neuron loss in response to MCAO.",

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The TNFα-transgenic rat: Hippocampal synaptic integrity, cognition, function, and post-ischemic cell loss

Abstract

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