title: [Activity of cell-detached 5'-nucleotidase in thymocytes of various densities].
abstract: The rat thymocytes submitted to heating at 45 degrees C for 1 hr liberate plasma membrane fragments containing 5'-nucleotidase activity in the supernatant. The thymocytes were separated by ficoll density gradient centrifugation. High activity of 5'-nucleotidase per 10(6) cells was found in the supernatant of low density (1.069) subset of thymocytes. Thymocyte supernatant of rats treated with hydrocortisone demonstrated higher 5'-nucleotidase activity per 10(6) cells than in intact animals. This is due to an increase of the low density population of thymocytes in treated rats since the 5'-nucleotidase activity per 10(6) cells of the supernatant obtained from this density fraction is the same both in treated with hydrocortisone and intact rats. Hydrocortisone seems to induce a selection of the thymocytes with high 5'-nucleotidase activity.
mesh_terms: D000818:Animals; D002458:Cell Fractionation; D002462:Cell Membrane / Q000187:drug effects / Q000201:enzymology; D006854:Hydrocortisone / Q000494:pharmacology; D009708:Nucleotidases / Q000302:isolation & purification / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D013601:T-Lymphocytes / Q000187:drug effects / Q000201:enzymology*
chemical_list: D009708:Nucleotidases; D006854:Hydrocortisone
vernacular_title: Aktivnost' otdeliaemoĭ ot kletok 5'-nukleotidazy v timotsitakh razlichnoĭ plotnosti.