Effects of ecdysteroids on RNA synthesis of fat body cells in Calliphora vicina

Ecdysone and ecdysterone induce the synthesis of RNA in fat body cells and isolated nuclei from Calliphora larvae. The inducibility of RNA synthesis is correlated to specific development stages. The fat body cells and the isolated nuclei differ in their response to the two ecdysteroids, ecdysterone giving rise to better responses. The greatest part of the induced RNA represents ribosomal RNA but also new species of nonribosomal RNA are transcribed under the influence of ecdysterone.