Available online 9 June 2022, 107649
Highlights•Implantation of a chronic microdrive array caused sexually dimorphic behavioral effects.
•Microdrive male mice learned faster than both intact and ovariectomized females.
•The weight of the drive alone did not cause the sex-differences in behavior.
•Proteomics analysis suggest the MAPK pathway, acute inflammation, and BDNF may underlie these changes.
AbstractNeuroscience techniques, including in vivo recording, have allowed for a great expansion in knowledge; however, this technology may also affect the very phenomena researchers set out to investigate. Including both female and male mice in our associative learning experiments shed light on sex differences on the impact of chronic implantation of tetrodes on learning. While previous research showed intact female mice acquired trace eyeblink conditioning faster than male and ovariectomized females, implantation of chronic microdrive arrays showed sexually dimorphic effects on learning. Microdrive implanted male mice acquired the associative learning paradigm faster than both intact and ovariectomized females. These effects were not due to the weight of the drive alone, as there were no significant sex-differences in learning of animals that received “dummy drive” implants without tetrodes lowered into the brain. Tandem mass tag mass spectrometry and western blot analysis suggest that significant alterations in the MAPK pathway, acute inflammation, and brain derived neurotrophic factor may underlie these observed sex- and surgery-dependent effects on learning.
KeywordsSex Differences
Stress
Chronic Implant
Learning
Eyeblink Conditioning
In Vivo Electrophysiology
AbbreviationsHPAhypothalamic-pituitary-adrenal
NGFBrain Derived Nerve Growth Factor
tEBCtrace eyeblink conditioning
BDNFbrain derived neurotrophic factor
ELISAEnzyme Linked Immunosorbent Assay
TEABTriethylammonium bicarbonate
LC-MSliquid chromatography–mass spectrometry
GO:BPCGO, Biological Process Complete
Ntrk2BDNF/NT-3 growth factors receptor
Dusp7Dual specificity protein phosphatase 7
MifMacrophage migration inhibitory factor
GFAPGlial fibrillary acidic protein
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