Species Specificity of the Insect Prothoracicotropic Hormone (PITH): the Presence of Bombyx-and Samia-Specific PTTHs in the Brain of Bombyx mori |
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| Authors: | HIRONORI ISHIZAKI AKIRA MIZOGUCHI MARIKO FUJISHITA ATSUSHI SUZUKI IKUO MORIYA HISAYOSHI O'OKA HIROSHI KATAOKA AKIRA ISOGAI HIROMICHI NAGASAWA SABURO TAMURA AKINORI SUZUKI |
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| Institution: | Biological Institute, Faculty of Science, Nagoaya University, Chikusa-ku, Nagoya 464, Japan;Department of Agricultural Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113, Japan |
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| Abstract: | Crude extracts of Bombyx mori brains can provoke adult development when injected into brain-removed dormant pupae of Bombyx mori and Samia Cynthia ricini. From this fact the prothoracicotropic hormone (PTTH) of Bombyx has long been thought to be species-nonspecifically active on Samia. Chemical fractionation of Bombyx brain or head extracts by fractional precipitation with acetone, Sephadex G-50 gel-filtration, and DEAE-Sepharose CL-6B chromatography, however, separated the fractions which activated Bombyx brainless pupae from those which activated Samia. Those results reveal the existence of two species-specific PTTHs. |
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