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Immunological regulation by a β-adrenergic-like octopamine receptor gene in crowded larvae of the oriental Armyworm, Mythmina separata.

Abstract：

:Recent reports demonstrate that octopamine plays an important immunological role in crowded larvae of the Oriental Armyworm, Mythmina separata. We identified an octopamine receptor, the β-adrenergic-like gene (designated MsOctβ2R), with a 1191 bp open reading frame that encodes 396 amino acids and contains seven conserved hydrophobic transmembrane domains. Multiple sequence alignments and a phylogenetic analysis indicated that MsOctβ2R was orthologous to Octβ2R that is present in other lepidopterans. MsOctβ2R was expressed throughout all developmental stages with higher relative expression during the fourth instar and adult stages. MsOctβ2R was highly expressed in the ventral nerve cord and the fat body relative to other examined tissues. Elevated MsOctβ2R expression was observed in larvae that were under higher-density conditions (7 and 10 larvae per jar). Silencing MsOctβ2R expression via dsRNA injections in larvae from higher-density conditions significantly decreased phenoloxidase (PO) and lysozyme activity, total haemocyte counts, and survival rates against Beauveria bassiana infections (54.06%, 9.91%, 36.22%, and 23.53%, respectively) when compared with control larvae. These results suggest that high-density conditions might alter prophylactic immunity in larvae by regulating the MsOctβ2R gene in M. separara and provide new insights into density-dependent prophylaxis in insects.

journal_name

Dev Comp Immunol

journal_title

Developmental and comparative immunology

authors

Kong H,Yuan L,Dong C,Zheng M,Jing W,Tian Z,Hou Q,Cheng Y,Zhang L,Jiang X,Luo L

doi

10.1016/j.dci.2020.103802

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

103802

eissn

0145-305X

issn

1879-0089

pii

S0145-305X(20)30357-8

journal_volume

113

pub_type

杂志文章

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