TNF-α and its receptors modulate complex behaviours and neurotrophins in transgenic mice.
Level 5 - mechanism / opinion, no new human data
Preclinical animal research (Oxford CEBM Level 5).
PubMed 24094876 · doi:10.1016/j.psyneuen.2013.09.010
What was done
Researchers evaluated 12-week-old transgenic mice lacking TNF-α (TNF-/-), TNF receptor 1 (TNF-R1-/-), or TNF receptor 2 (TNF-R2-/-) alongside C57BL/6 wild-type (WT) controls. They tested spatial memory and learning using the Barnes maze and Y-maze, as well as exploratory, social interaction, anxiety-like, and depression-like behaviors. They also measured hippocampal and prefrontal cortex levels of NGF and BDNF via ELISA and quantified proliferating cells (Ki67) and immature neurons (DCX) in the dentate gyrus with immunohistochemistry.
What was found
The abstract reports no exact numerical values, effect sizes, or test statistics. Directionally: TNF-/- and TNF-R1-/- mice displayed impairments in learning and memory in the Barnes maze and Y-maze; TNF-R2-/- mice showed intact memory but slower learning; TNF-/- and TNF-R2-/- mice showed decreased anxiety-like behavior compared to WT mice; and TNF-/- and TNF-R2-/- mice had lower levels of NGF compared to WT mice.
Why it matters
The findings demonstrate that basal physiological TNF-α signaling via both TNF-R1 and TNF-R2 is required for normal cognitive function in mice, even though TNF-α deficiency reduces anxiety-like behaviors.
Limits
This is an animal knockout study, so findings cannot be directly translated to human clinical physiology. The abstract provides no sample sizes, specific quantitative data, or results for several tested measures (including BDNF, Ki67, DCX, social interaction, and depression tests). Whole-body constitutive knockout models also risk developmental confounds.
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