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Baseline prepulse inhibition of the startle reflex predicts the sensitivity to the conditioned rewarding effects of cocaine in male and female mice.

Abstract：

RATIONALE:Prepulse inhibition (PPI) of the startle reflex is a model of pre-attentional inhibitory function. The dopamine baseline in the nucleus accumbens plays a key role in PPI regulation as well as in the rewarding effects of cocaine. OBJECTIVES:The aim of this study was to evaluate the predictive ability of PPI to identify the more vulnerable mice of both sexes to the conditioned rewarding effects of cocaine. METHODS:Male and female OF1 mice were first tested in the PPI paradigm to classify them as high or low PPI. Afterwards, they were evaluated in the conditioned place preference (CPP) paradigm induced by cocaine (1, 6 and 12 mg/kg). Moreover, the D1R and D2R protein expressions in the striatum of high and low PPI animals were analysed by Western blot. RESULTS:Only high-PPI mice acquired CPP induced by low doses of cocaine (1 and 6 mg/kg), while the low-PPI mice needed a higher dose of cocaine (12 mg/kg) to acquire the CPP, but once mice were conditioned, males did not extinguish the conditioned preference and females reinstated the preference with lower doses of cocaine than their control counterparts. Low-PPI animals, especially females, showed higher basal levels of D2R than those with a higher PPI. CONCLUSIONS:Low-PPI mice presented a lower sensitivity to the conditioned rewarding effects of cocaine, but once they were conditioned with a higher dose, they displayed a stronger, perseverant conditioned preference. The predictive capacity of PPI to detect the more vulnerable mice to the conditioned effects of cocaine is discussed.

journal_name

Psychopharmacology (Berl)

journal_title

Psychopharmacology

authors

Arenas MC,Navarro-Francés CI,Montagud-Romero S,Miñarro J,Manzanedo C

doi

10.1007/s00213-018-4959-8

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

2651-2663

issue

9

eissn

0033-3158

issn

1432-2072

pii

10.1007/s00213-018-4959-8

journal_volume

235

pub_type

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