TY - JOUR
T1 - Effect of tyramine and stress on sex-pheromone production in the pre- and post-mating silkworm moth, Bombyx mori
AU - Hirashima, Akinori
AU - Yamaji, Hideomi
AU - Yoshizawa, Takaki
AU - Kuwano, Eiichi
AU - Eto, Morifusa
N1 - Funding Information:
We thank Dr. Toshio Ichikawa in the Faculty of Science, Kyushu University for his valuable advice throughout this work and allowing us to use his HPLC systems. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan.
PY - 2007/12
Y1 - 2007/12
N2 - Tyramine (TA) increased significantly after mating, whereas there were no significant differences in octopamine (OA) and dopamine (DA) levels in the brain-suboesophageal ganglion (SOG) complexes between virgin and mated females. The effects of various biogenic amines were tested on pheromone production of virgin and mated females of the silkworm moth, Bombyx mori. After 8 h a significant reduction by TA (46%) was observed. Meanwhile, when OA or DA was injected, a significant increase of pheromone titer was observed in both virgin and mated females. This study also presents evidence for an increase in levels of OA and DA in the brain-SOG complexes in response to mechanical stress in B. mori female. TA suppressed pheromone production in an in vitro pheromone gland (PG) homogenate preparation, thus suggesting that the target of TA is the PG. TA inhibited pheromone production in vitro in a dose-dependent manner and DA had a lower inhibitory activity than TA, whereas OA had no effect, suggesting that TA is a candidate for regulating pheromone production in the PG, although other factors could be responsible for the pheromonostatic function.
AB - Tyramine (TA) increased significantly after mating, whereas there were no significant differences in octopamine (OA) and dopamine (DA) levels in the brain-suboesophageal ganglion (SOG) complexes between virgin and mated females. The effects of various biogenic amines were tested on pheromone production of virgin and mated females of the silkworm moth, Bombyx mori. After 8 h a significant reduction by TA (46%) was observed. Meanwhile, when OA or DA was injected, a significant increase of pheromone titer was observed in both virgin and mated females. This study also presents evidence for an increase in levels of OA and DA in the brain-SOG complexes in response to mechanical stress in B. mori female. TA suppressed pheromone production in an in vitro pheromone gland (PG) homogenate preparation, thus suggesting that the target of TA is the PG. TA inhibited pheromone production in vitro in a dose-dependent manner and DA had a lower inhibitory activity than TA, whereas OA had no effect, suggesting that TA is a candidate for regulating pheromone production in the PG, although other factors could be responsible for the pheromonostatic function.
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U2 - 10.1016/j.jinsphys.2007.06.018
DO - 10.1016/j.jinsphys.2007.06.018
M3 - Article
C2 - 17681526
AN - SCOPUS:35448956466
SN - 0022-1910
VL - 53
SP - 1242
EP - 1249
JO - Journal of insect physiology
JF - Journal of insect physiology
IS - 12
ER -