title: Regulation of spermidine/spermine N1-acetyltransferase in L6 cells by polyamines and related compounds.
abstract: Exposure of rat L6 cells in culture to exogenous polyamines led to a very large increase in the activity of spermidine/spermine N1-acetyltransferase. Spermine was more potent than spermidine in bringing about this increase, but in both cases the elevated acetyltransferase activity increased the cellular conversion of spermidine into putrescine. The N1-acetyltransferase turned over very rapidly in the L6 cells, with a half-life of 9 min after spermidine and 18 min after spermine. A wide variety of synthetic polyamine analogues also brought about a substantial induction of spermidine/spermine N1-acetyltransferase activity. These included sym-norspermidine, sym-norspermine, sym-homospermidine, N4-substituted spermidine derivatives, 1,3,6-triaminohexane, 1,4,7-triaminoheptane and deoxyspergualin, which were comparable with spermidine in their potency, and N1N8-bis(ethyl)spermidine, N1N9-bis(ethyl)homospermidine, methylglyoxal bis(guanylhydrazone), ethylglyoxal bis(guanylhydrazone) and 1,1'-[(methylethanediylidene)dinitrilo]bis(3-amino-guanidine ), which were even more active than spermidine. It is suggested that these polyamine analogues may bring about a decrease in cellular polyamines not only by inhibiting biosynthesis but by stimulating the degradation of spermidine into putrescine.
mesh_terms: D000123:Acetyltransferases / Q000096:biosynthesis*; D002478:Cells, Cultured; D004790:Enzyme Induction / Q000187:drug effects; D008935:Mitoguazone / Q000031:analogs & derivatives / Q000494:pharmacology; D011073:Polyamines / Q000378:metabolism / Q000494:pharmacology*; D013095:Spermidine / Q000494:pharmacology; D013096:Spermine / Q000494:pharmacology; D000099228:Diamine N-Acetyltransferase
chemical_list: D000123:Acetyltransferases; D008935:Mitoguazone; D011073:Polyamines; D013095:Spermidine; D013096:Spermine; D000099228:Diamine N-Acetyltransferase; C012430:1,1'-(methylethanediylidenedinitrilo)bis(3-aminoguanidine)