Changes in lipophorin composition during the fourth to fifth instar molt of Manduca sexta |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan;2. Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8579, Japan;1. University of Southern California, Neuroscience Graduate Program, Los Angeles, CA, United States;2. University of Southern California, Department of Biological Sciences, Human and Evolutionary Biology Section, Los Angeles, CA, United States;1. Neuroscience Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW 2010, Australia;2. St. Vincent''s Clinical School, UNSW Sydney, Sydney, NSW 2052, Australia |
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| Abstract: | During the feeding stage of the fourth instar of the tobacco hornworm, Manduca sexta, lipophorin has a density of 1.144 g/ml and is comprised of 55% protein and 45% lipid, mainly diacylglycerol and phospholipid. These values are similar to those found during the corresponding period of the fifth instar. However, during the intermolt period the lipid composition of lipophorin changes to 45% protein and 55% lipid and the density decreases to 1.112 g/ml. The onset of these changes in lipid content correspond to the increase in ecdysteroid titer which signals the beginning of molting. At the end of molting both the lipid content and density return to those characteristic of the fifth instar. These data further confirm the complex nature of lipophorin metabolism in M. sexta larva and suggest that ecdysone may be the trigger for lipid mobilization during the intermolt period. |
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