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Khan F, Stanley D, Kim Y. Two Alimentary Canal Proteins, Fo-G N and Fo-Cyp1, Act in Western Flower Thrips, Frankliniella occidentalis TSWV Infection. INSECTS 2023; 14:insects14020154. [PMID: 36835723 PMCID: PMC9965231 DOI: 10.3390/insects14020154] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Revised: 01/30/2023] [Accepted: 02/01/2023] [Indexed: 05/15/2023]
Abstract
Tomato spotted wilt virus (TSWV) is a plant virus that causes massive economic damage to high-valued crops. This virus is transmitted by specific thrips, including the western flower thrips, Frankliniella occidentalis. TSWV is acquired by the young larvae during feeding on infected host plants. TSWV infects the gut epithelium through hypothetical receptor(s) and multiplies within the cells for subsequent horizontal transmission to other plant hosts via the salivary glands during feeding. Two alimentary canal proteins, glycoprotein (Fo-GN) and cyclophilin (Fo-Cyp1), are thought to be associated with the TSWV entry into the gut epithelium of F. occidentalis. Fo-GN possesses a chitin-binding domain, and its transcript was localized on the larval gut epithelium by fluorescence in situ hybridization (FISH) analysis. Phylogenetic analysis indicated that F. occidentalis encodes six cyclophilins, in which Fo-Cyp1 is closely related to a human cyclophilin A, an immune modulator. The Fo-Cyp1 transcript was also detected in the larval gut epithelium. Expression of these two genes was suppressed by feeding their cognate RNA interference (RNAi) to young larvae. The RNAi efficiencies were confirmed by the disappearance of the target gene transcripts from the gut epithelium by FISH analyses. The RNAi treatments directed to Fo-GN or Fo-Cyp1 prevented the typical TSWV titer increase after the virus feeding, compared to control RNAi treatment. Our immunofluorescence assay using a specific antibody to TSWV documented the reduction of TSWV in the larval gut and adult salivary gland after the RNAi treatments. These results support our hypothesis that the candidate proteins Fo-GN and Fo-Cyp1 act in TSWV entry and multiplication in F. occidentalis.
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Affiliation(s)
- Falguni Khan
- Department of Plant Medicals, Andong National University, Andong 36729, Republic of Korea
| | - David Stanley
- Biological Control of Insects Research Laboratory, USDA/ARS, 1503 S Providence Road, Columbia, MO 65203, USA
| | - Yonggyun Kim
- Department of Plant Medicals, Andong National University, Andong 36729, Republic of Korea
- Correspondence: ; Tel.: +82-54-820-5638
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Zhang P, Liu ZY, Yu D, Xu CX, Hu Y, Liang YP, Jin J, Li M. Microplitis bicoloratus parasitism promotes cyclophilin D-p53 interaction to induce apoptosis of hemocytes in Spodoptera litura. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2023; 112:e21970. [PMID: 36200410 DOI: 10.1002/arch.21970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 09/04/2022] [Accepted: 09/13/2022] [Indexed: 06/16/2023]
Abstract
Microplitis bicoloratus parasitism can induce apoptosis of hemocytes in the M. bicolortus host, Spodoptera litura. However, it is unclear how M. bicolortus parasitism regulates host signaling pathways to induce apoptosis. Expression of cyclophilin D (CypD) and p53 was significantly upregulated in S. litura hemocytes at 6 days postparasitization. In the parasitized hemocytes, there was mitochondrial membrane potential (△Ψm ) loss, cytochrome c (Cyt C) release from mitochondria, and caspase-3 activation. These occurred while hemocytes were undergoing upregulation of CypD and p53. Parasitism also promoted the interaction between CypD and p53. CypD silencing could rescue the apoptotic phenotypes induced by parasitism, but had no effect on apoptosis in unparasitized S. litura. These findings suggest that the CypD-p53 pathway may be an important component of the parasitism-induced immunosuppressive response and establish a basis for further studies of parasitoid/host interactions.
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Affiliation(s)
- Pan Zhang
- Key Laboratory of the University in Yunnan Province for International Cooperation in Intercellular Communications and Regulation, School of Life Sciences, Yunnan University, Kunming, China
| | - Zi-Yan Liu
- Key Laboratory of the University in Yunnan Province for International Cooperation in Intercellular Communications and Regulation, School of Life Sciences, Yunnan University, Kunming, China
- Center of Molecular Biology of Tropical Crops, Yunnan Institute of Tropical Crops, Jinghong, China
| | - Dan Yu
- Key Laboratory of the University in Yunnan Province for International Cooperation in Intercellular Communications and Regulation, School of Life Sciences, Yunnan University, Kunming, China
| | - Cui-Xian Xu
- Key Laboratory of the University in Yunnan Province for International Cooperation in Intercellular Communications and Regulation, School of Life Sciences, Yunnan University, Kunming, China
- School of Health, Yunnan Technology and Business University, Kunming, China
| | - Yan Hu
- Key Laboratory of the University in Yunnan Province for International Cooperation in Intercellular Communications and Regulation, School of Life Sciences, Yunnan University, Kunming, China
| | - Ya-Ping Liang
- Key Laboratory of the University in Yunnan Province for International Cooperation in Intercellular Communications and Regulation, School of Life Sciences, Yunnan University, Kunming, China
| | - Jie Jin
- School of Urban and Environmental Sciences, Yunnan University of Finance and Economics, Kunming, China
| | - Ming Li
- Key Laboratory of the University in Yunnan Province for International Cooperation in Intercellular Communications and Regulation, School of Life Sciences, Yunnan University, Kunming, China
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