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Wolbachia successfully replicate in a newly established horn fly, Haematobia irritans irritans (L.) (Diptera: Muscidae) cell line

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Madhav, M., Brown, G. W., Morgan, J. A.T., Asgari, S., McGraw, E. A., Munderloh, U. G., Kurtti, T. J. and James, P. (2020) Wolbachia successfully replicate in a newly established horn fly, Haematobia irritans irritans (L.) (Diptera: Muscidae) cell line. Pest Management Science, 76 (7). pp. 2441-2452. ISSN 1526-498X

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Article Link: https://doi.org/10.1002/ps.5785

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/ps.5785


BACKGROUND Haematobia spp., horn flies (HF) and buffalo flies (BF), are economically important ectoparasites of dairy and beef cattle. Control of these flies relies mainly on treating cattle with chemical insecticides. However, the development of resistance to commonly used compounds is compromising the effectiveness of these treatments and alternative methods of control are required. Wolbachia are maternally transmitted endosymbiotic bacteria of arthropods that cause various reproductive distortions and fitness effects, making them a potential candidate for use in the biological control of pests. The first step towards this is the establishment and adaptation of xenobiotic infections of Wolbachia in target host cell lines. RESULTS Here, we report the successful establishment of a continuous HF cell line (HIE-18) from embryonic cells and its stable transinfection with Wolbachia strains wAlbB native to mosquitoes, and wMel and wMelPop native to Drosophila melanogaster. HIE-18 cells were typically round and diploid with ten chromosomes (2n = 10) or tetraploid with 20 chromosomes (4n = 20), with a doubling time of 67.2 h. Wolbachia density decreased significantly in HIE-18 cells in the first 48 h of infection, possibly due to overexpression of antimicrobial peptides through the Imd immune signalling pathway. However, density recovered after this time and HIE-18 cell lines stably infected with the three strains of Wolbachia have now each been subcultured more than 50 times as persistently infected lines. CONCLUSION The amenability of HF cells to infection with different strains of Wolbachia and the establishment of stable sustaining infections suggest the potential for use of Wolbachia in novel approaches for the control of Haematobia spp. Further, the availability of the HIE-18 cell line will provide an important resource for the study of genetics, host–parasite interactions and chemical resistance in Haematobia populations. © 2020 Society of Chemical Industry

Item Type:Article
Business groups:Animal Science
Keywords:Wolbachia biocontrol horn fly Haematobia spp. biopesticide pest management veterinary ectoparasite
Subjects:Science > Entomology
Science > Microbiology
Animal culture > Cattle
Veterinary medicine > Veterinary parasitology
Live Archive:31 Aug 2020 01:46
Last Modified:03 Sep 2021 16:46

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