Abstract
The relations between the nutritional state and the polysome level are determined in the fat body and silk glands of the Bombyx mori larva. In the fat body, the polysome level is drastically reduced during starvation and increases rapidly 20 min after intake of food. This delay does not correspond to a digestion time or a delay of transit in the intestine. The increase occurs only if free amino acids are present in the food. The ingestion of tryptophan alone by previously starved larvae promotes the formation of heavy polysomes and an increase in the incorporation of radioactive precursors into the proteins of the fat body. Enhancement of the proteosynthetic activity of this organ can also be obtained independently of any food intake by the injection of various and unrelated substances. Tryptophan ingestion and insulin injection have no effect on the polysome level of the silk glands.
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