The role of juvenile hormone in endocrine control of pigmentation in Manduca sexta |
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| Institution: | 1. Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China;2. Chongqing Key Laboratory of Neurobiology, Chongqing 400016, China;3. Institute of Neuroscience and the Collaborative Innovation Center for Brain Science, Chongqing Medical University, Chongqing 400016, China;4. Department of Clinical Laboratory, The First Affiliated Hospital of Kunming Medical University, Kunming 650032, China;5. School of Public Health and Management, Chongqing Medical University, Chongqing 400016, China;6. Department of Laboratory Animal Science, College of Basic Medical Sciences, Third Military Medical University, 400038 Chongqing, China;1. College of Mathematics and Econometrics, Hunan University, Changsha, Hunan 410082, China;2. College of Mathematics and Econometrics, Changsha University of Science & Technology, Changsha, Hunan 410082, China;3. School of Mathematics and Statistics, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China;4. Science Program, Texas A&M University at Qatar, Doha, PO Box 23874, Qatar |
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| Abstract: | Spatial and temporal distribution of insecticyanin was studied in the fourth and fifth larval instars of Manduca sexta. The protein was distributed between the epidermis (62%), the hemolymph (37%) and the pericardial cells (0.5%). Hemolymph insecticyanin (HINS) was highest (0.6 mg/ml) in the very early fourth instar, gradually declining to 0.3 mg/ml. Levels in the fifth instar decreased after ecdysis (0.15 mg/ml), began to rise at wandering, and nearly doubled by the time of pupation. Titers of epidermal insecticyanin (EINS) followed the general growth patterns during the fourth and early fifth instar. At 76 hr after fifth instar ecdysis, titers of EINS dropped precipitously and then rose again to peak just after the wandering stage. Levels of EINS again rapidly declined and could not be detected after 180 hr. Ecdysteroids appear to shut off synthesis of EINS but this response is quantitatively modified in the presence of JH. Endocrine manipulation of the last larval-larval molt indicated that juvenile hormone (JH) acts quantitatively on EINS to induce a dose-dependent increase. The JH-induced increase can be as much as 4-fold, depending upon the body region. |
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