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J. Biochem, 1984, Vol. 95, No. 6 1803-1809
© 1984 Japanese Biochemical Society

research-article

Changes in Polyamine Levels in Various Organs of Bombyx mori during Its Life Cycle1

Koei HAMANA*, Shigeru MATSUZAKI** and Kinji INOUE*

*College of Medical Care and Technology, Gunma University Maebashi, Gunma 371
**Institute of Endocrinology, Gunma University Maebashi, Gunma 371

Polyamines in various organs of larval, pupal, and moth stages of Bombyx mori, were assayed by high-performance ion-exchange chromatography and paper and thin-layer chromatography. Putrescine and spermidine were especially abundant in the silk gland, gonads, mucous gland, and sucking stomach; spermine was also present in them, but at much lower concentrations. Both norspermidine and norspermine were detected in almost all organs examined, while their precursor 1,3-diaminopropane was found only in a limited number of organs. Low concentrations of sym-homospermidine were observed in the silk gland and ovary. Cadaverine content was particularly high in the mucous gland which contained diapause eggs and the sucking stomach. Diapause eggs contained much higher levels of cadaverine than non-diapause eggs. The concentrations of most polyamines in the silk glands remained rather constant during the larval stage, and decreased markedly at the pupal stage. Polyamines in gonads, in contrast, did not decrease at the pupal stage, but putrescine, diaminopropane, and norspermidine rather increased during the pupal and moth stages.

1This study was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan.


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