Corticotropin-releasing factor distribution in the brain of the brown anole lizard

Abstract

Corticotropin-releasing factor (CRF) is best known for its involvement in peripheral glucocorticoid release across vertebrate species. However, CRF is also produced and released throughout various brain regions to regulate central aspects of the stress response. While these various CRF populations have been described extensively in mammals, less is known about their distributions in other amniotes, and only a handful of studies have ever examined CRF distributions in reptiles. Out study is the first to map CRF cell and fiber distributions in the brain of a lizard, the brown anole (Anolis sagrei). Our results indicate that brown anole CRF distributions are highly similar to those in snakes and turtles. However, unlike in these other reptile species, we find immunofluorescent CRF neurons in a few additional brown anole locations, most notably the supraoptic nucleus. The CRF distribution in the present study is also similar to published CRF descriptions in mammals and birds, although our findings, as well as the other published reports in reptiles, collectively suggest that reptiles possess a slightly more restricted distribution of CRF cell populations than do mammals and birds.