Effects of L-thyroxine on incorporation of (32)P into phospholipids of freshwater eels.
The effects of L-thyroxine on phospholipid biosynthesis, via (32)P incorporation, were studied in gill, kidney, liver and muscle tissue of eels acclimatized at 11 degrees C. L-thyroxine treatment had no effect on tissue content of lipid, inorganic and organic acid-soluble phosphorus. Only an increase of the specific radioactivities of lipid, inorganic and organic acid-soluble phosphorus was observed in the muscle. Percentage distribution of (32)P among classes of phospholipid were significantly altered in liver and muscle, without change in phospholipid composition. A specific effect of L-thyroxine on (32)P incorporation into phosphatidic acid in muscle and liver has been shown. As expected by the higher specific radioactivity of muscle inorganic and organic acid-soluble phosphorus, the increased incorporation of (32)P into phosphatidic acid probably results from a higher specific radioactivity of muscle ATP phosphorus.
Institut Michel Pacha, Université Claude Bernard Lyon 1, 1337 Corniche Michel Pacha, 83500 La Seyne sur Mer, France. gzwing.imp@wanadoo.fr
G
G
Zwingelstein
G
G
Brichon
N
N
Abdul Malak
J
J
Bodennec
J
J
Portoukalian
D000818:Animals; D004524:Eels / Q000378:metabolism*; D005618:Fresh Water; D005880:Gills / Q000378:metabolism; D007668:Kidney / Q000378:metabolism; D007700:Kinetics; D008099:Liver / Q000378:metabolism; D018482:Muscle, Skeletal / Q000378:metabolism; D010743:Phospholipids / Q000378:metabolism*; D010759:Phosphorus Isotopes / Q000378:metabolism*; D013974:Thyroxine / Q000494:pharmacology*
D010743:Phospholipids; D010759:Phosphorus Isotopes; D013974:Thyroxine