Aging networks in Caenorhabditis elegans: AMP‐activated protein kinase (aak‐2) links multiple aging and metabolism pathways

• Published in: Aging cell 2006-04, Vol.5 (2), p.119-126
• Main Authors: Curtis, Rory, O'Connor, Greg, DiStefano, Peter S.
• Format: Article
• Language: English
• Subjects: Adenine Nucleotides - metabolism; aging; Aging - physiology; AMP kinase; AMP-Activated Protein Kinases; Animals; C. elegans; Caenorhabditis elegans - enzymology; Caenorhabditis elegans - growth & development; Caenorhabditis elegans - physiology; Caenorhabditis elegans Proteins - metabolism; Feeding Behavior; Forkhead Transcription Factors; FOXO; Gene Expression Regulation, Developmental; Germ-Line Mutation - genetics; insulin receptor; Larva - growth & development; Longevity; Mitochondria - metabolism; Models, Biological; Multienzyme Complexes - metabolism; Protein Binding; Protein-Serine-Threonine Kinases - metabolism; Sirtuins - metabolism; Time Factors; Transcription Factors - metabolism
• ISSN: 1474-9718; 1474-9726
• DOI: 10.1111/j.1474-9726.2006.00205.x

Summary Molecular genetics in lower organisms has allowed the elucidation of pathways that modulate the aging process. In certain instances, evolutionarily conserved genes and pathways have been shown to regulate lifespan in mammals as well. Many gene products known to affect lifespan are intimately involved in the control of energy metabolism, including the fuel sensor AMP‐activated protein kinase (AMPK). We have shown previously that over‐expression of an AMPK α subunit in Caenorhabditis elegans, designated aak‐2, increases lifespan. Here we show the interaction of aak‐2 with other pathways known to control aging in worms. Lifespan extension caused by daf‐2/insulin‐like signaling mutations was highly dependent on aak‐2, as was the lifespan extension caused by over‐expression of the deacetylase, sir‐2.1. Similarly, there was partial requirement for aak‐2 in lifespan extension by mitochondrial mutations (isp‐1 and clk‐1). Conversely, aak‐2 was not required for lifespan extension in mutants lacking germline stem cells (glp‐1) or mutants of the eating response (eat‐2). These results show that aging is controlled by overlapping but distinct pathways and that AMPK/aak‐2 represents a node in a network of evolutionarily conserved biochemical pathways that control aging.