Estradiol-17 beta modifies the induction of spermidine/spermine N1-acetyltransferase activity in the liver of lipopolysaccharide-treated mice.
In an attempt to elucidate the effects of estrogen on polyamine metabolism in lipopolysaccharide (LPS)-treated mice, we assayed polyamine content and the activity of spermidine/spermine N1-acetyltransferase (SAT) and ornithine decarboxylase (ODC) in some organs. LPS elevated N1-acetylspermidine levels in the liver and lung and putrescine levels in the liver, lung and spleen. LPS increased the activity of ODC at 6 h and that of SAT at 12 h in the liver. When estradiol-17 beta was simultaneously administered with LPS, the maximum increase in hepatic N1-acetylspermidine levels was found 6 h earlier than in the LPS control. Likewise, the peak of the hepatic SAT activity after LPS-treatment was observed 6 h earlier in the estradiol-17 beta-treated mice than in the LPS control. No such effect of estradiol-17 beta was found in the lung and spleen. The LPS-induced ODC activity was not affected by estradiol-17 beta in the liver, lung or spleen. Estrone and 16 beta-ethylestradiol (an anti-estrogen) were also effective in enhancing the LPS-induced elevation of N1-acetyl-spermidine and putrescine in the liver, while both diethylstilbestrol, which has a potent estrogenic activity without steroid structure and estradiol-17 alpha (a non-estrogenic isomer of estradiol-17 beta) were without effect. Tamoxifen (an estrogen receptor antagonist) did not suppress the estrogen-induced increase in hepatic N1-acetylspermidine levels.
Sugimoto
H
H
Department of Physiology, Gunma University, Japan.
Matsuzaki
Y
Y
Yuasa
K
K
Kaneko
M
M
Yamada
S
S
Hamana
K
K
Matsuzaki
S
S
D000123:Acetyltransferases / Q000378:metabolism*; D000818:Animals; D004790:Enzyme Induction / Q000187:drug effects; D004958:Estradiol / Q000494:pharmacology*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D008070:Lipopolysaccharides / Q000008:administration & dosage; D008099:Liver / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D008168:Lung / Q000201:enzymology / Q000378:metabolism; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009955:Ornithine Decarboxylase / Q000187:drug effects; D013095:Spermidine / Q000378:metabolism; D013096:Spermine / Q000378:metabolism; D013154:Spleen / Q000201:enzymology / Q000378:metabolism; D000099228:Diamine N-Acetyltransferase
D000123:Acetyltransferases; D004958:Estradiol; D008070:Lipopolysaccharides; D009955:Ornithine Decarboxylase; D013095:Spermidine; D013096:Spermine; D000099228:Diamine N-Acetyltransferase