Abstract
The physiological role of uncoupling protein 1 in white fat depot is not yet fully understood. Analysis of adipose tissues of animals from natural populations may be an informative addition to the laboratory experiment in the study of this problem. The paper presents the first case of the detection of uncoupling protein 1 in inguinal white fat depot of short-tailed field voles (Microtus agrestis) and Korean field mice (Apodemus peninsulae). The animals were caught in West Sayan in the summer of 2015. Their inguinal fat was of non-typical dark-pink color with the brown colored inclusions, increased content of total protein in comparison with these parameters of laboratory mice. Immunoreactive UCP1 was identified in this white fat pad of about two-thirds of the animals. The interscapular brown fat weight, morphology, biochemical properties were typical. We assumed the inguinal fat with uncoupling protein 1 to be responsible for heating the low limb muscles and triggering their high activity at low summer night temperatures in West Sayan.
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