Title : Protein synthesis inhibition in mouse peritoneal macrophages results in increased acyl coenzyme A:cholesterol acyl transferase activity and cholesteryl ester accumulation in the presence of native low density lipoprotein.

Pub. Date : 1987 Sep 5

PMID : 3624250






6 Functional Relationships(s)
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1 We now report that when protein synthesis is inhibited in mouse peritoneal macrophages by treatment with cycloheximide, puromycin, or actinomycin D, native LDL-induced whole-cell ACAT activity and CE accumulation is 10-fold higher than that seen in LDL-treated control cells. Cycloheximide acetyl-Coenzyme A acetyltransferase 1 Mus musculus
2 The enhancement of ACAT activity was seen 4 h after the addition of cycloheximide, and ACAT activity returned to control values 4 h after the withdrawal of cycloheximide. Cycloheximide acetyl-Coenzyme A acetyltransferase 1 Mus musculus
3 The enhancement of ACAT activity was seen 4 h after the addition of cycloheximide, and ACAT activity returned to control values 4 h after the withdrawal of cycloheximide. Cycloheximide acetyl-Coenzyme A acetyltransferase 1 Mus musculus
4 Postnuclear supernatants and microsomes from cycloheximide-treated mouse peritoneal macrophages also had higher ACAT activity than microsomes from control cells, but the relative enhancement (maximum 3.3-fold) was less than that seen when ACAT was assayed in the intact cell. Cycloheximide acetyl-Coenzyme A acetyltransferase 1 Mus musculus
5 Postnuclear supernatants and microsomes from cycloheximide-treated mouse peritoneal macrophages also had higher ACAT activity than microsomes from control cells, but the relative enhancement (maximum 3.3-fold) was less than that seen when ACAT was assayed in the intact cell. Cycloheximide acetyl-Coenzyme A acetyltransferase 1 Mus musculus
6 In contrast to the situation with mouse peritoneal macrophages, cycloheximide treatment of J774 macrophages, which under normal conditions display high ACAT activity and CE accumulation in the presence of native LDL, did not result in further enhancement of either ACAT activity or LDL-induced CE accumulation. Cycloheximide acetyl-Coenzyme A acetyltransferase 1 Mus musculus