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6 November 2019 The Autophagy-Related Protein GABARAP Is Induced during Overwintering in the Bean Bug (Hemiptera: Alydidae)
Shin-Ichiro Tachibana, Shinji Matsuzaki, Masako Tanaka, Masayuki Shiota, Daisuke Motooka, Shota Nakamura, Shin G. Goto
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Abstract

In most insects dependent on food resources that deplete seasonally, mechanisms exist to protect against starvation. Insects overcome periods of food depletion using diapause-associated physiological mechanisms, such as increased energy resources in fat bodies and suppression of metabolism. Because autophagy supplies energy resources through the degradation of intracellular components, we hypothesized that it might be an additional strategy to combat starvation during overwintering. In this study, we measured the abundance of the proteins involved in the signaling pathway of autophagy during overwintering in adults of the bean bug Riptortus pedestris (Fabricius) (Hemiptera: Alydidae), which must withstand the periodic depletion of its host plants from late fall to early spring. Although the levels of gamma-aminobutyric acid receptor-associated protein (GABARAP) markedly increased after the cessation of food supply, AMP-activated protein kinase (AMPK) and target of rapamycin (TOR) were not found to be associated with food depletion. Thus, food depletion appears to induce autophagy independent of AMPK and TOR. The GABARAP levels significantly increased universally when the food supply ceased, irrespective of the diapause status of adults and low-temperature conditions. In overwintering diapause adults under seminatural conditions, the GABARAP levels significantly increased during early spring. Thus, autophagy appears to assist the survival of the bean bugs under natural conditions of food deficiency.

© The Author(s) 2019. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
Shin-Ichiro Tachibana, Shinji Matsuzaki, Masako Tanaka, Masayuki Shiota, Daisuke Motooka, Shota Nakamura, and Shin G. Goto "The Autophagy-Related Protein GABARAP Is Induced during Overwintering in the Bean Bug (Hemiptera: Alydidae)," Journal of Economic Entomology 113(1), 427-434, (6 November 2019). https://doi.org/10.1093/jee/toz287
Received: 5 April 2019; Accepted: 30 September 2019; Published: 6 November 2019
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KEYWORDS
autophagy
diapause
overwintering
starvation
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