Hyperactive when young, hypoactive and overweight when aged: Connecting the dots in the story about locomotor activity, body mass, and aging in Trpv1 knockout mice

We have recently found that, at a young age, transient receptor potential vanilloid-1 (Trpv1) knockout ((−)/(−)) mice have a higher locomotor activity than their wild-type littermates ((+)/(+)). We have also found that, with age, Trpv1(−/−) mice become substantially heavier than Trpv1(+/+) controls, thus forming a paradoxical association between locomotor hyperactivity and overweight. The present study solves this contradiction. By using two experimental paradigms, we show that aged Trpv1(−/−) mice have not an increased, but a decreased, locomotor activity, as compared to age-matched Trpv1(+/+) controls. We also confirm that aged Trpv1(−/−) mice are overweight. We conclude that TRPV1 channels are involved in the regulation of both general locomotor activity and body mass in an age-dependent manner.