RNA interference (RNAi) has been used successfully to reduce target gene expression and induce specific phenotypes in several species. It has proved useful as a tool to investigate gene function and has the potential to manage pest populations and reduce disease pathogens. However, it is not known whether different administration methods are equally effective at interfering with genes in bees. Therefore, we compared the effects of feeding and injection of small interfering RNA (siRNA) on the messenger RNA (mRNA) levels of alpha-aminoadipic semialdehyde dehydrogenase (), 4-coumarate-CoA ligase (), and heat shock protein 70 (). Both feeding and injection of siRNA successfully knocked down the gene but feeding required more siRNA than the injection. Our results suggest that both feeding and injection of siRNA effectively interfere with brain genes in bees. The appropriateness of each method would depend on the situation.
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http://dx.doi.org/10.3390/insects13100928 | DOI Listing |
Commun Biol
December 2024
Department of Physiology, Kochi Medical School, Kochi University, Kochi, Japan.
While olfactory behaviors are influenced by neuromodulatory signals, the underlying mechanism remains unknown. The olfactory tubercle (OT), a component of the olfactory cortex and ventral striatum, consists of anteromedial (am) and lateral (l) domains regulating odor-guided attractive and aversive behaviors, respectively, in which the amOT highly expresses various receptors for feeding-regulated neuromodulators. Here we show functions of appetite-stimulating orexin-1 receptor (OxR1) signaling in the amOT.
View Article and Find Full Text PDFPest Manag Sci
December 2024
Postdoctoral Mobile Station of Biology, Genetic Engineering Research Center, College of Life Sciences, Chongqing University, Chongqing, China.
Background: Discovering insecticidal proteins with high activity and strict insect specificity and applying them to the biological control of insect pests is of great significance. Oral LqhIT2 has insecticidal activity, which most other insecticidal neurotoxin proteins do not have, but the large-scale preparation of the toxin is difficult and one of the obstacles to determining its anti-insect potential for biological control.
Results: In this study, the expression level of recombinant LqhIT2 (rLqhIT2) in Pichia pastoris was as high as 1.
J Physiol
December 2024
Department of Molecular and Integrative Physiology, University of Illinois Urbana-Champaign, Urbana, IL, USA.
Although mammals resist both acute weight loss and weight gain, the neural circuitry mediating bi-directional defense against weight change is incompletely understood. Global constitutive deletion of the melanocortin-3-receptor (MC3R) impairs the behavioural response to both anorexic and orexigenic stimuli, with MC3R knockout mice demonstrating increased weight gain following anabolic challenges and increased weight loss following anorexic challenges (i.e.
View Article and Find Full Text PDFJ Physiol Biochem
December 2024
Department of Exercise Physiology, Faculty of Sport Sciences, Shahid Rajaee Teacher Training University, Tehran, Iran.
The circadian clock regulates mitochondrial function and affects time-dependent metabolic responses to exercise. The present study aimed to determine the effects of aerobic exercise timing at the light-dark phase on the proteins expression of the circadian clock, mitochondrial dynamics, and, NAD-SIRT1-PPARα axis in skeletal muscle of high-fat diet-induced diabetic mice. In this experimental study, thirty male mice were randomly assigned into two groups based on time: the early light phase, ZT3, and the early dark phase, ZT15, and three groups at each time: (1) Healthy Control (HC), (2) Diabetic Control (DC), and (3) Diabetic + Exercise (DE).
View Article and Find Full Text PDFLaryngoscope
December 2024
Division of Otolaryngology - Head and Neck Surgery, Phoenix Children's Hospital, Phoenix, Arizona, U.S.A.
Objectives: To investigate the relationship between social determinants of health and timeliness of management, adherence to follow-up, and outcomes of treatment with interarytenoid injection augmentation (IAIA).
Methods: Retrospective cohort study of all pediatric patients treated with IAIA at a large pediatric institution's multidisciplinary aerodigestive clinic between August 2022 and February 2024. Retrieved demographic factors, dates of referral, consultation, treatment, and follow-up, as well as objective measures of dysphagia and aspiration via videofluoroscopic swallow study (VFSS) reports, using dysphagia outcome and severity scale (DOSS) scores and the greatest unsafe thickness, or 'aspiration score'.
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