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Serine utilization in mouse liver: Influence of caloric restriction and aging
Author(s) -
Hagopian Kevork,
Ramsey Jon J.,
Weindruch Richard
Publication year - 2005
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2005.02.062
Subject(s) - serine , gluconeogenesis , caloric theory , medicine , endocrinology , dehydratase , biology , phosphorylation , biochemistry , chemistry , enzyme , metabolism
The influence of caloric restriction (CR) on the activities of hepatic serine metabolizing enzymes in young (3 months) and old (30 months) mice was studied. Serine dehydratase (SDH) activity increased markedly with age in both diet groups and in old mice was higher in the CR group. No effects of CR were observed in the young. Serine:pyruvate transaminase (SPT) and glycerate kinase activities were unaffected by age and diet. However, glycerate dehydrogenase activity was decreased in old CR mice but not in young CR. The results of this study show that long‐term CR influenced serine utilization only in the pathway catalyzed by SDH. This suggests that in mouse liver this pathway is critical for serine utilization in gluconeogenesis, while the SPT pathway plays a minor role. The increase in SDH activity with long‐term CR is consistent with sustained increase in gluconeogenesis.