Summary
Homogenates and plasma membranes were isolated from the livers of male Fischer 344 rats ranging in age from 19 hr to 92 days postnatal. These plasma membranes exhibited comparable levels of purity: protein yields were 2–2.5%; relative specific activities of 5′-nucleotidase and ouabain-sensitive Na+/K+-ATPase were from 8–11 and from 12–19, respectively. 5′-nucleotidase and ouabain-sensitive Na+-K+-ATPase displayed distinct and different developmental patterns. The activity of γ-glutamyltranspeptidase was found to be at exceptionally high levels in isolated plasma membranes immediately after birth and to decline precipitously thereafter achieving and maintaining low levels from days 3–21 postnatal. Liver plasma membrane γ-glutamyltranspeptidase activity was observed to increase 9.2 fold from this low point, first rising on day 21, peaking on day 40 and returning to low levels by day 56. From day 56 day to 92 postnatal, γ-glutamyltranspeptidase activity was expressed at a uniformly low level but a level 2 fold higher than that preceeding the rise at day 40. The hormone determinants of these developmental changes in γ-glutamyltranspeptidase activity are discussed.
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Sulakhe-Hemmings, S.J., Pulga, V.B. & Tran, S.T. An extended developmental study of γ-glutamyltranspeptidase in rat liver plasma membranes: identification of specific patterns of changes in activity in the adult as well as the neonatal state. Mol Cell Biochem 115, 71–77 (1992). https://doi.org/10.1007/BF00229098
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DOI: https://doi.org/10.1007/BF00229098