Altered ambient temperature and ethanol-induced conditioned place preference in mice

Area of Science:

• Neuroscience
• Behavioral Pharmacology
• Animal Models

Background:

• Previous research indicates a link between thermal responses and ethanol's effects on place conditioning in rodents.
• Altered ambient temperature (Ta) has been shown to influence hypothermia and place aversion/preference related to ethanol.

Purpose of the Study:

• To investigate if changes in ambient temperature (Ta) affect ethanol's capacity to induce conditioned place preference in mice.
• To determine the role of Ta during conditioning and testing phases on ethanol-induced place preference.

Main Methods:

• Genetically heterogeneous mice were conditioned using a differential place preference paradigm.
• One floor texture was paired with ethanol (2.25 g/kg, i.p.) and another with saline.
• Conditioning occurred at three different ambient temperatures: cold (10°C), normal (21°C), and warm (34°C).
• Testing for preference was conducted at either the conditioning temperature or a different temperature.

Main Results:

• Mice conditioned and tested at normal ambient temperature (21°C) exhibited a conditioned place preference for the ethanol-paired floor.
• Exposure to cold (10°C) or warm (34°C) ambient temperatures during conditioning or testing abolished place conditioning.
• While both cold and warm Ta interfered with place conditioning, only warm Ta significantly affected ethanol-induced hypothermia.

Conclusions:

• Altered ambient temperatures (cold or warm) disrupt the establishment or expression of ethanol-conditioned place preference in mice.
• The findings suggest that environmental temperature may produce internal stimuli that interfere with the associative learning process or its behavioral manifestation.
• This highlights the importance of controlled environmental conditions in studies of drug-induced behaviors and learning.