Proteomic analysis of parasitized Plutella xylostella larvae plasma

Kyung Han Song, Min Kyo Jung, Jai Hoon Eum, In Cheon Hwang, Sung Sik Han

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

Insects use their innate immunity to defend themselves against foreign invaders, such as microorganisms, nematodes and parasites. . Cotesia plutellae, an endoparasitoid wasp that parasitizes the diamondback moth . Plutella xylostella, uses several strategies to attack the host immune system, such as injection of viruses, venom, and serosal membrane-derived cells denoted teratocytes. However, the proteome profiles related to these immune deficiency systems have yet to be clearly defined. In this study, we investigate differences in protein expression patterns in parasitized . P. xylostella larvae, with a view to identifying parasitism-specific factors. Using 2D polyacrylamide gel electrophoresis, proteins in the host plasma were assessed every 48. h after parasitism by . C. plutellae. A large number of protein spots (350 in total) were detected, and approximately 50 spots were differentially expressed in the parasitized . P. xylostella larvae every 48. h. In total, 26 potential candidates, including . P. xylostella Serpin 2 (pxSerpin 2), translationally controlled tumor protein, signal transduction histidine kinase, apolipophorin-III, and fatty-acid binding protein were identified through quadrupole time-of-flight tandem mass spectrometry and sequence homology analysis. These proteins were classified into the following functional groups: immunity, signaling, lipid metabolism, energy metabolism, amino acid/nucleotide metabolism, and others. The pxSerpin 2 gene was cloned, and its expression profile investigated during the course of parasitism. Real-time PCR analysis of pxSerpin 2 revealed a poor correlation between the mRNA level and protein abundance. Our results clearly suggest that parasitism-specific proteins participate in suppression of the host immune response.

Original languageEnglish
Pages (from-to)1271-1280
Number of pages10
JournalJournal of Insect Physiology
Volume54
Issue number8
DOIs
Publication statusPublished - 2008 Aug

Bibliographical note

Funding Information:
We thank Professor Yonggyun Kim for providing the initial P. xylostella and C. plutellae pupae. We acknowledge Gyeong-Jin Kang for reading of the manuscript, Tae-Joong Yoon for statistical analysis, Joo-Hee Chung and Sylvia Hwang for advising us on use of the Progenesis image analysis software. This study was supported by a grant (Code 200503010343640070100) from the Bio-Green 21 Program (Rural Development Administration, Republic of Korea) and Brain Korea 21 (Korea Ministry of Education).

Keywords

  • Cotesia plutellae
  • Parasitism-specific proteins
  • Plutella xylostella
  • Proteomics
  • PxSerpin 2

ASJC Scopus subject areas

  • Physiology
  • Insect Science

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