Frontiers in Immunology (May 2022)

The Dual Functions of a Bracovirus C-Type Lectin in Caterpillar Immune Response Manipulation

  • Xiaotong Wu,
  • Xiaotong Wu,
  • Xiaotong Wu,
  • Xiaotong Wu,
  • Zhiwei Wu,
  • Zhiwei Wu,
  • Zhiwei Wu,
  • Xiqian Ye,
  • Xiqian Ye,
  • Xiqian Ye,
  • Xiqian Ye,
  • Lan Pang,
  • Lan Pang,
  • Lan Pang,
  • Yifeng Sheng,
  • Yifeng Sheng,
  • Yifeng Sheng,
  • Zehua Wang,
  • Zehua Wang,
  • Zehua Wang,
  • Yuenan Zhou,
  • Yuenan Zhou,
  • Yuenan Zhou,
  • Jiachen Zhu,
  • Jiachen Zhu,
  • Jiachen Zhu,
  • Rongmin Hu,
  • Rongmin Hu,
  • Rongmin Hu,
  • Sicong Zhou,
  • Sicong Zhou,
  • Sicong Zhou,
  • Jiani Chen,
  • Jiani Chen,
  • Jiani Chen,
  • Zhizhi Wang,
  • Zhizhi Wang,
  • Zhizhi Wang,
  • Zhizhi Wang,
  • Min Shi,
  • Min Shi,
  • Min Shi,
  • Min Shi,
  • Min Shi,
  • Jianhua Huang,
  • Jianhua Huang,
  • Jianhua Huang,
  • Jianhua Huang,
  • Jianhua Huang,
  • Xuexin Chen,
  • Xuexin Chen,
  • Xuexin Chen,
  • Xuexin Chen,
  • Xuexin Chen

DOI
https://doi.org/10.3389/fimmu.2022.877027
Journal volume & issue
Vol. 13

Abstract

Read online

Parasitoids are widespread in natural ecosystems and normally equipped with diverse viral factors to defeat host immune responses. On the other hand, parasitoids can enhance the antibacterial abilities and improve the hypoimmunity traits of parasitized hosts that may encounter pathogenic infections. These adaptive strategies guarantee the survival of parasitoid offspring, yet their underlying mechanisms are poorly understood. Here, we focused on Cotesia vestalis, an endoparasitoid of the diamondback moth Plutella xylostella, and found that C. vestalis parasitization decreases the number of host hemocytes, leading to disruption of the encapsulation reaction. We further found that one bracovirus C-type lectin gene, CvBV_28-1, is highly expressed in the hemocytes of parasitized hosts and participates in suppressing the proliferation rate of host hemocytes, which in turn reduces their population and represses the process of encapsulation. Moreover, CvBV_28-1 presents a classical bacterial clearance ability via the agglutination response in a Ca2+-dependent manner in response to gram-positive bacteria. Our study provides insights into the innovative strategy of a parasitoid-derived viral gene that has dual functions to manipulate host immunity for a successful parasitism.

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