Circadian modulation of ecdysteroid titer in Galleria mellonella larvae

Morph-associated JH titer diel rhythm in Gryllus firmus: Experimental verification of its circadian basis and cycle characterization in artificially selected lines raised in the field

“…In contrast to numerous vertebrate studies, relatively few studies in insects have directly documented daily cycles for various aspects of endocrine regulation, and even fewer have experimentally demonstrated the circadian basis of these cycles, or have investigated functional aspects of the cycles (e.g. Cymborowski et al, 1991;Dai et al, 1995;Ito and Sumi, 1998; for review see Vafopoulou and Steel, 2005). Two notable exceptions are the extensive chronobiological studies of the developmental hormones PTTH (prothoracicotropic hormone) and ecdysteroids in Rhodnius prolixus (reviewed in Vafopoulou and Steel, 2005, and in Steel and Vafopoulou, 2006), and the pheromonotropic neurohormone PBAN in various lepidopterans (Rafaeli et al, 1991;Iglesias et al, 2002;reviewed in Vafopoulou and Steel, 2005).…”

Morph-associated JH titer diel rhythm in Gryllus firmus: Experimental verification of its circadian basis and cycle characterization in artificially selected lines raised in the field

“…In contrast to numerous vertebrate studies, relatively few studies in insects have directly documented daily cycles for various aspects of endocrine regulation, and even fewer have experimentally demonstrated the circadian basis of these cycles, or have investigated functional aspects of the cycles (e.g. Cymborowski et al, 1991;Dai et al, 1995;Ito and Sumi, 1998; for review see Vafopoulou and Steel, 2005). Two notable exceptions are the extensive chronobiological studies of the developmental hormones PTTH (prothoracicotropic hormone) and ecdysteroids in Rhodnius prolixus (reviewed in Vafopoulou and Steel, 2005, and in Steel and Vafopoulou, 2006), and the pheromonotropic neurohormone PBAN in various lepidopterans (Rafaeli et al, 1991;Iglesias et al, 2002;reviewed in Vafopoulou and Steel, 2005).…”

Endocrine alteration and precocious premetamorphic behaviors in the greater wax moth larvae,Galleria mellonella, parasitized by an endoparasitoid,Apanteles galleriae

“…Ecdysteroid levels in the hemolymph of G. mellonella larvae have been investigated principally during the last instar (Hsiao and Hsiao, 1977;Bollenbacher et al, 1978;Sehnal et al, 1981;Plantevin et al, 1984;Cymborowski et al, 1989). Sehnal et al (1986) detected 300 ng ecdysteroid equivalents per gram of body weight in the penultimate instar and a threefold higher peak in the last instar larvae (L7).…”

Endocrine alteration and precocious premetamorphic behaviors in the greater wax moth larvae, Galleria mellonella, parasitized by an endoparasitoid, Apanteles galleriae

“…This behavior is paralleled by the increase of ecdysteroid contents in the hemolymph at a time when the JH titer has fallen very low (Richter et al, 1989). Ecdysteroid levels in the hemolymph of G. mellonella larvae have been investigated principally during the last instar (Hsiao and Hsiao, 1977;Bollenbacher et al, 1978;Sehnal et al, 1981;Plantevin et al, 1984;Cymborowski et al, 1989). Sehnal et al (1986) detected 300 ng ecdysteroid equivalents per gram of body weight in the penultimate instar and a threefold higher peak in the last instar larvae (L7).…”

Morph-associated JH titer diel rhythm in Gryllus firmus: Experimental verification of its circadian basis and cycle characterization in artificially selected lines raised in the field

“…In contrast to numerous vertebrate studies, relatively few studies in insects have directly documented daily cycles for various aspects of endocrine regulation, and even fewer have experimentally demonstrated the circadian basis of these cycles, or have investigated functional aspects of the cycles (e.g. Cymborowski et al, 1991;Dai et al, 1995;Ito and Sumi, 1998; for review see Vafopoulou and Steel, 2005). Two notable exceptions are the extensive chronobiological studies of the developmental hormones PTTH (prothoracicotropic hormone) and ecdysteroids in Rhodnius prolixus (reviewed in Vafopoulou and Steel, 2005, and in Steel and Vafopoulou, 2006), and the pheromonotropic neurohormone PBAN in various lepidopterans (Rafaeli et al, 1991;Iglesias et al, 2002;reviewed in Vafopoulou and Steel, 2005).…”

Endocrine alteration and precocious premetamorphic behaviors in the greater wax moth larvae,Galleria mellonella, parasitized by an endoparasitoid,Apanteles galleriae

“…Ecdysteroid levels in the hemolymph of G. mellonella larvae have been investigated principally during the last instar (Hsiao and Hsiao, 1977;Bollenbacher et al, 1978;Sehnal et al, 1981;Plantevin et al, 1984;Cymborowski et al, 1989). Sehnal et al (1986) detected 300 ng ecdysteroid equivalents per gram of body weight in the penultimate instar and a threefold higher peak in the last instar larvae (L7).…”

Endocrine alteration and precocious premetamorphic behaviors in the greater wax moth larvae, Galleria mellonella, parasitized by an endoparasitoid, Apanteles galleriae

“…This behavior is paralleled by the increase of ecdysteroid contents in the hemolymph at a time when the JH titer has fallen very low (Richter et al, 1989). Ecdysteroid levels in the hemolymph of G. mellonella larvae have been investigated principally during the last instar (Hsiao and Hsiao, 1977;Bollenbacher et al, 1978;Sehnal et al, 1981;Plantevin et al, 1984;Cymborowski et al, 1989). Sehnal et al (1986) detected 300 ng ecdysteroid equivalents per gram of body weight in the penultimate instar and a threefold higher peak in the last instar larvae (L7).…”

Morph-associated JH titer diel rhythm in Gryllus firmus: Experimental verification of its circadian basis and cycle characterization in artificially selected lines raised in the field

“…In contrast to numerous vertebrate studies, relatively few studies in insects have directly documented daily cycles for various aspects of endocrine regulation, and even fewer have experimentally demonstrated the circadian basis of these cycles, or have investigated functional aspects of the cycles (e.g. Cymborowski et al, 1991;Dai et al, 1995;Ito and Sumi, 1998; for review see Vafopoulou and Steel, 2005). Two notable exceptions are the extensive chronobiological studies of the developmental hormones PTTH (prothoracicotropic hormone) and ecdysteroids in Rhodnius prolixus (reviewed in Vafopoulou and Steel, 2005, and in Steel and Vafopoulou, 2006), and the pheromonotropic neurohormone PBAN in various lepidopterans (Rafaeli et al, 1991;Iglesias et al, 2002;reviewed in Vafopoulou and Steel, 2005).…”

Endocrine alteration and precocious premetamorphic behaviors in the greater wax moth larvae,Galleria mellonella, parasitized by an endoparasitoid,Apanteles galleriae

“…Ecdysteroid levels in the hemolymph of G. mellonella larvae have been investigated principally during the last instar (Hsiao and Hsiao, 1977;Bollenbacher et al, 1978;Sehnal et al, 1981;Plantevin et al, 1984;Cymborowski et al, 1989). Sehnal et al (1986) detected 300 ng ecdysteroid equivalents per gram of body weight in the penultimate instar and a threefold higher peak in the last instar larvae (L7).…”

Endocrine alteration and precocious premetamorphic behaviors in the greater wax moth larvae, Galleria mellonella, parasitized by an endoparasitoid, Apanteles galleriae

“…This behavior is paralleled by the increase of ecdysteroid contents in the hemolymph at a time when the JH titer has fallen very low (Richter et al, 1989). Ecdysteroid levels in the hemolymph of G. mellonella larvae have been investigated principally during the last instar (Hsiao and Hsiao, 1977;Bollenbacher et al, 1978;Sehnal et al, 1981;Plantevin et al, 1984;Cymborowski et al, 1989). Sehnal et al (1986) detected 300 ng ecdysteroid equivalents per gram of body weight in the penultimate instar and a threefold higher peak in the last instar larvae (L7).…”