Divergent mechanisms for regulating growth and development after imaginal disc damage in the tobacco hornworm, Manduca sexta

Author:

Rosero Manuel A.1,Abdon Benedict1,Silva Nicholas J.1,Cisneros Larios Brenda1,Zavaleta Jhony A.1,Makunts Tigran1,Chang Ernest S.2,Bashar S. Janna1,Ramos Louie S.1,Moffatt Christopher A.1,Fuse Megumi1ORCID

Affiliation:

1. San Francisco State University, 1600 Holloway Avenue, San Francisco, CA 94132, USA

2. Bodega Marine Laboratory, University of California-Davis, P.O. Box 247, Bodega Bay, CA 94923, USA

Abstract

Holometabolous insects have been able to radiate to vast ecological niches as adults through the evolution of adult-specific structures such as wings, antennae and eyes. These structures arise from imaginal discs that show regenerative capacity when damaged. During imaginal disc regeneration, development has been shown to be delayed in the fruit fly Drosophila melanogaster, but how conserved the delay-inducing mechanisms are across holometabolous insects has not been assessed. The goal of this research was to develop the hornworm, Manduca sexta, as an alternative model organism to study such damage-induced mechanisms, with the advantage of a larger hemolymph volume enabling access to the hormonal responses to imaginal disc damage. Upon whole-body x-ray exposure, we noted that the imaginal discs were selectively damaged, as assessed by TUNEL and acridine orange stains. Moreover, development was delayed, predominantly at the pupal-to-adult transition, with a concomitant delay in the prepupal ecdysteroid peak. The delays to eclosion were dose-dependent, with some ability for repair of damaged tissues. We noted a shift in critical weight, as assessed by the point at which starvation no longer impacted developmental timing, without a change in growth rate, which was uncoupled from juvenile hormone clearance in the body. The developmental profile was different from Drosophila melanogaster, which suggests species differences may exist in the mechanisms delaying development.

Funder

National Institutes of Health

National Science Foundation

California State University

Center for Computing for Life Sciences, San Francisco State University

San Francisco State University

Genentech Foundation

Publisher

The Company of Biologists

Subject

Insect Science,Molecular Biology,Animal Science and Zoology,Aquatic Science,Physiology,Ecology, Evolution, Behavior and Systematics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Signaling Pathways That Regulate the Crustacean Molting Gland;Frontiers in Endocrinology;2021-06-21

2. Tobacco hornworm caterpillars held up by imaginal disc damage;Journal of Experimental Biology;2019-10-15

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