Volume 41, Issue 1 p. 59-66
Original Article

Probable mechanism of sexual dimorphism in insulin control of Drosophila heat stress resistance

Nataly E. Gruntenko

Corresponding Author

Nataly E. Gruntenko

Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

Correspondence: Nataly E. Gruntenko, Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Lavrentyeva 10, Novosibirsk 630090, Russia. Tel.: +7191319341814; e-mail: [email protected]Search for more papers by this author
Evgenia K. Karpova

Evgenia K. Karpova

Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

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Elena V. Burdina

Elena V. Burdina

Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

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Natalya V. Adonyeva

Natalya V. Adonyeva

Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

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Olga V. Andreenkova

Olga V. Andreenkova

Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

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Alexander A. Alekseev

Alexander A. Alekseev

Institute of Chemical Kinetics and Combustion, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

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Inga Y. Rauschenbach

Inga Y. Rauschenbach

Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

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First published: 26 December 2015
Citations: 9

Abstract

Adult males of Drosophila species (Drosophila melanogaster L. and Drosophila virilis) show a lower tolerance to heat stress compared with females. The present study investigates the effects of RNA interference (RNAi) knockdown of the insulin-like receptor in the corpus allatum of D. melanogaster males on dopamine metabolism and content, heat stress resistance and juvenile hormone metabolism. In male flies, the knockdown of insulin-like receptor in the corpus allatum is shown to change metabolism of juvenile hormone but not dopamine. It is also shown that knockdown of the insulin-like receptor in the corpus allatum results in a decrease of heat stress resistance in females but not males, and that juvenile hormone rescues this decrease. The results suggest that at least one of the ways in which insulin-like growth factors affect heat stress resistance is by successive mediation through juvenile hormone and dopamine, which could lead to sexual dimorphism in the trait.