Transcriptional regulation of the PTTH receptor in prothoracic glands of the silkworm, Bombyx mori

► Transcriptional regulation of Torso gene in Bombyx prothoracic glands was investigated. ► PTTH treatment in vitro time-dependently affected Torso mRNA levels. ► Methoprene application delayed a decline in Torso mRNA levels. ► Injection of 20-hydroxyecdysone stimulated Torso mRNA levels. ► Torso mRNA levels were also shown to be nutrition-sensitive.