Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (691 KB)

Title: Contributions of immune responses to developmental resistance in Lymantria dispar challenged with baculovirus

Author: McNeil, James; Cox-Foster, Diana; Slavicek, James; Hoover, Kelli.;

Date: 2010

Source: Journal of Insect Physiology. 56: 1167-1177.

Publication Series: Scientific Journal (JRNL)

Description: How the innate immune system functions to defend insects from viruses is an emerging field of study. We examined the impact of melanized encapsulation, a component of innate immunity that integrates both cellular and humoral immune responses, on the success of the baculovirus Lymantria dispar multiple nucleocapsid nucleopolyhedrovirus (LdMNPV) in its host L. dispar. L. dispar exhibits midgutbased and systemic, age-dependent resistance to LdMNPV within the fourth instar; the LD50 in newly molted larvae is approximately 18-fold lower than in mid-instar larvae (48-72 h post-molt). We examined the role of the immune system in systemic resistance by measuring differences in hemocyte immunoresponsiveness to foreign targets, hemolymph phenoloxidase (PO) and FAD-glucose dehydrogenase (GLD) activities, and melanization of infected tissue culture cells. Mid-instar larvae showed a higher degree of hemocyte immunoresponsiveness, greater potential PO activity (pro-PO) at the time the virus is escaping the midgut to enter the hemocoel (72 h post-inoculation), greater GLD activity, and more targeted melanization of infected tissue, which correlate with reduced viral success in the host. These findings support the hypothesis that innate immune responses can play an important role in antiviral defenses against baculoviruses and that the success of these defenses can be age-dependent.

Keywords: encapsulation, innate immunity, hemocytes, phenoloxidase, FAD-glucose dehydrogenase, anti-viral defense, developmental resistance, baculovirus

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
  • This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
  • Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, if you notice any errors which make this publication unusable.



McNeil, James; Cox-Foster, Diana; Slavicek, James; Hoover, Kelli. 2010. Contributions of immune responses to developmental resistance in Lymantria dispar challenged with baculovirus. Journal of Insect Physiology. 56: 1167-1177.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.