Immunological function of Bombyx Toll9-2 in the silkworm (Bombyx mori) larval midgut: Activation by Escherichia coli/lipopolysaccharide and regulation of growth.
Bombyx Toll9‐2
Bombyx mori
Escherichia coli
RNA interference
immune response
lipopolysaccharid
Journal
Archives of insect biochemistry and physiology
ISSN: 1520-6327
Titre abrégé: Arch Insect Biochem Physiol
Pays: United States
ID NLM: 8501752
Informations de publication
Date de publication:
Aug 2024
Aug 2024
Historique:
revised:
18
06
2024
received:
28
03
2024
accepted:
29
06
2024
medline:
9
8
2024
pubmed:
9
8
2024
entrez:
9
8
2024
Statut:
ppublish
Résumé
Toll receptors are important regulators of insects' innate immune system which, upon binding of pathogen molecules, activate a conserved signal transduction cascade known as the Toll pathway. RNA interference (RNAi) is a powerful tool to study the function of genes via reverse genetics. However, due to the reported refractory of RNAi efficiency in lepidopteran insects, successful reports of silencing of Toll receptors in the silkworm Bombyx mori have not been reported yet. In this study, a Toll receptor of the silkworm Bombyx Toll9-2 (BmToll9-2) was cloned and its expression and function were analyzed. The results showed that BmToll9-2 contains an ectodomain (ECD) with a signal peptide and nine leucine-rich repeats, a transmembrane helix, and a cytoplasmic region with a Toll/interleukin-1 domain. Phylogenetic analysis indicates that BmToll9-2 clusters with other insect Toll9 receptors and mammalian Toll-like receptor 4. Oral infection of exogenous pathogens showed that the Gram-negative bacterium Escherichia coli and its main cell wall component lipopolysaccharide (LPS), as well as the Gram-positive bacterium Staphylococcus aureus and its main cell wall component peptidoglycan, significantly induce BmToll9-2 expression in vivo. LPS also induced the expression of BmToll9-2 in BmN4 cells in vitro. These observations indicate its role as a sensor in the innate immunity to exogenous pathogens and as a pathogen-associated receptor that is responsive to LPS. RNAi of BmToll9-2 was effective in the midgut and epidermis. RNAi-mediated knock-down of BmToll9-2 reduced the weight and growth of the silkworm. Bacterial challenge following RNAi upregulated the expression of BmToll9-2 and rescued the weight differences of the silkworm, which may be related to its participation in the immune response and the regulation of the microbiota in the midgut lumen of the silkworm larvae.
Substances chimiques
Insect Proteins
0
Lipopolysaccharides
0
Toll-Like Receptors
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e22130Subventions
Organisme : Science and Technology Program of Guangzhou
ID : 202102010465
Organisme : National Natural Science Foundation of China
ID : 31501898
Organisme : Featured Innovation Project of Universities in Guangdong Province
ID : 2019KTSCX133
Organisme : Natural Science Foundation of Guangdong Province
ID : 2017A030313152
Organisme : Pearl River S&T Nova Program of Guangzhou
ID : 201710010094
Informations de copyright
© 2024 Wiley Periodicals LLC.
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