Developmental changes in <sub>D</sub>-serine level in the silkworm, <i>Bombyx mori</i>

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  • Hasegawa Yuichiro
    Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University
  • Okumura Minoru
    Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University
  • Tojo Miki
    Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University
  • Nakagaki Masao
    Department of Applied Biology, Faculty of Textile Science and Technology, Shinshu University
  • Nagata Yoko
    Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University

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  • Developmental changes in D-serine level in the silkworm, Bombyx mori

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To elucidate the physiological role of D-serine, an optical isomer of the common L-serine, in invertebrates, we investigated in detail changes in the D-serine level (concentration) occurring with growth and development in the silkworm, Bombyx mori, since the silkworm is known for containing high concentrations of D-serine. The body d-serine level increased with age until the late pupal stage. The total amount of D-serine in the body also increased with age and formed two peaks at the pre-spinning to early spinning stage and the late pupal stage, suggesting that the larvae may require D-serine to become pupae and imagoes, respectively. Contrary to the D-serine level, the L-serine level decreased with age after the second instar, with increase-decrease repeats until the pupal stage. High concentrations of D-serine were excreted in feces, gut purge, meconium, and exuvium, suggesting that the body d-serine is maintained at a proper level for growth and development by excluding the amino acid from the body.<br>

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