Effects of HIV-1 TAT protein and methamphetamine exposure on visual discrimination and executive function in mice.

Abstract:

:Mild neurocognitive impairments are common in people with human immunodeficiency virus (HIV) infection. HIV-encoded proteins, such as trans-activator of transcription (TAT), contribute to neuropathology and cognitive function in medicated subjects. The combination of TAT and comorbid methamphetamine use may further impair neurocognitive function in HIV-positive individuals by affecting dopaminergic systems in the brain. The current study examined the effects of TAT protein expression and methamphetamine exposure on cognitive function and dopamine systems in mice. Transgenic mice with inducible brain expression of the TAT protein were exposed to a binge methamphetamine regimen. TAT expression was induced via a doxycycline-containing diet during the final stage of the regimen and maintained throughout cognitive testing. Learning and executive function were assessed using an operant visual discrimination protocol, with a strategy switch and reversal. TAT expression and methamphetamine exposure improved visual discrimination learning. Combined TAT expression and methamphetamine exposure increased perseverative errors during reversal learning. TAT expression altered reversal learning by improving early stage, but impairing late stage, learning. TAT expression was also associated with an increase in dopamine transporter expression in the caudate putamen. These results highlight that TAT expression and methamphetamine exposure likely affect a range of selective cognitive processes, with some potentially improving function under certain conditions.

journal_name

Behav Brain Res

authors

Kesby JP,Fields JA,Chang A,Coban H,Achim CL,Semenova S,TMARC Group.

doi

10.1016/j.bbr.2018.04.046

subject

Has Abstract

pub_date

2018-09-03 00:00:00

pages

73-79

eissn

0166-4328

issn

1872-7549

pii

S0166-4328(18)30332-2

journal_volume

349

pub_type

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