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The insect midgut undergoes programmed cell death (PCD) during metamorphosis, but the molecular basis for this phenomenon has not been demonstrated. We report a mod(mdg4) protein [designated as mod(mdg4)1A] that is involved in hormonally regulated insect midgut PCD, from the lepidopteran Helicoverpa armigera. Mod(mdg4)1A is localized in the larval midgut and is highly expressed during metamorphosis...
Programmed cell death (PCD) plays an important role in insect midgut remodeling during metamorphosis. Insect midgut PCD is triggered by the steroid hormone 20-hydroxyecdysone (20E) and it is mediated by a series of genes. However, the mechanism by which 20E triggers midgut PCD is still unclear. Here, we report a protein phosphatase 6 (PP6) from Helicoverpa armigera playing roles in midgut PCD. PP6...
The plasma membrane V-ATPase from Manduca sexta (Lepidoptera, Sphingidae) larval midgut is composed of at least 12 subunits, eight of which have already been identified molecularly [Wieczorek et al., J. Bioenerg. Biomembr. 31 (1999) 67-74]. Here we report primary sequences of subunits C, D, H and a, which previously had not been identified in insects. Expression of recombinant proteins, immunostaining...
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