Title : Mice with targeted disruption of spermidine/spermine N1-acetyltransferase gene maintain nearly normal tissue polyamine homeostasis but show signs of insulin resistance upon aging.

Pub. Date : 2006 Oct-Dec

PMID : 17125596






6 Functional Relationships(s)
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1 The N(1)-acetylation of spermidine or spermine by spermidine/spermine N(1)-acetyltransferase (SSAT) is the ratecontrolling enzymatic step in the polyamine catabolism. Polyamines spermidine/spermine N1-acetyl transferase 1 Mus musculus
2 The N(1)-acetylation of spermidine or spermine by spermidine/spermine N(1)-acetyltransferase (SSAT) is the ratecontrolling enzymatic step in the polyamine catabolism. Polyamines spermidine/spermine N1-acetyl transferase 1 Mus musculus
3 Contrary to SSAT deficient ES cells, polyamine pools in SSAT-KO mice remained almost unchanged in response to N(1),N(11)-diethylnorspermine (DENSPM) treatment compared to a significant reduction of the polyamine pools in the wild-type animals and ES cells. Polyamines spermidine/spermine N1-acetyl transferase 1 Mus musculus
4 The latter finding indicates that inducible SSAT plays an essential role in vivo in DENSPM treatmentevoked polyamine depletion, but a controversial role in toxicity of DENSPM. Polyamines spermidine/spermine N1-acetyl transferase 1 Mus musculus
5 Further characterization of SSAT knockout mice revealed insulin resistance at old age which supported the role of polyamine catabolism in glucose metabolism detected earlier with our SSAT overexpressing mice displaying enhanced basal metabolic rate, high insulin sensitivity and improved glucose tolerance. Polyamines spermidine/spermine N1-acetyl transferase 1 Mus musculus
6 Further characterization of SSAT knockout mice revealed insulin resistance at old age which supported the role of polyamine catabolism in glucose metabolism detected earlier with our SSAT overexpressing mice displaying enhanced basal metabolic rate, high insulin sensitivity and improved glucose tolerance. Polyamines spermidine/spermine N1-acetyl transferase 1 Mus musculus