Age changes in plasma proteins of the Mongolian gerbil

¹ Department of Physiology, College of Physicians and Surgeons, Columbia University, New York City

The effect of animal age on plasma protein composition was studied in the Mongolian gerbil, Meriones unguiculatus. Values for plasma protein fractions separated by electrophoresis were obtained from bromophenol blue-stained paper strips by elution and by scanning techniques, both of which yielded similar results. Total plasma proteins increased with age from 1 day to 28 months. Maximum albumin concentrations were attained at 3 months and maximum (adult) -globulin-fibrinogen concentrations at 28 months. A fast ₂-globulin fraction was found in plasma from the youngest age group (1–3 days) but absent in older groups. No sex-related differences in plasma proteins were found for gerbils at 3 and 6 months. Age-related changes in gerbil plasma proteins are similar to changes found during the life span of many other mammalian species.