Innate immune system still works at diapause, a physiological state of dormancy in insects
- Department of Reproductive Biology, National Center for Child Health and Development, 2-10-1 Okura, Setagaya, Tokyo 157-8535 (Japan)
- Section of Gene Expression Regulation, Frontier Science Research Center, Kagoshima University, 1-21-20 Korimoto, Kagoshima 890-0065 (Japan)
Highlights: {yields} Two major types of cells are present in the body fluid isolated from the thoracic region of a diapausing pupa. {yields} Phagocytosis and encapsulation by these cells were observed when latex beads as foreign targets were microinjected into a pupa. {yields} Such behavior by these cells was still observed even when pupae were continuously chilled at 4 {sup o}C. {yields} Innate cellular reactions can work in diapausing insects in a dormant state. -- Abstract: Diapause is most often observed in insects and is a physiologically dormant state different from other types of dormancy, such as hibernation. It allows insects to survive in harsh environments or extend longevity. In general, larval, pupal, or adult non-diapausing insects possess an innate immune system preventing the invasion of microorganisms into their bodies; however, it is unclear whether this system works under the dormant condition of diapause. We here report the occurrence of innate cellular reactions during diapause using pupae of a giant silkmoth, Samia cynthia pryeri. Scanning electron microscopic analysis demonstrated the presence of two major types of cells in the body fluid isolated from the thoracic region of a pupa. Phagocytosis and encapsulation, characteristics of innate cellular reactions, by these cells were observed when latex beads as foreign targets were microinjected into the internal portion of a pupa. Such behavior by these cells was still observed even when pupae were continuously chilled at 4 {sup o}C. Our results indicate that innate cellular reactions can work in diapausing insects in a dormant state.
- OSTI ID:
- 22204982
- Journal Information:
- Biochemical and Biophysical Research Communications, Vol. 410, Issue 2; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0006-291X
- Country of Publication:
- United States
- Language:
- English
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