Methods and Challenges of Using the Greater Wax Moth (Galleria mellonella) as a Model Organism in Antimicrobial
Athina Andrea1, Karen Angeliki Krogfelt2,3, Håvard Jenssen4
1Department of Science and Environment, Roskilde University, 4000 Roskilde, Denmark. atan@ruc.dk.
Abstract:
Among non-mammalian infection model organisms, the larvae of the greater wax moth Galleria mellonella have seen increasing popularity in recent years. Unlike other invertebrate models, these larvae can be incubated at 37 °C and can be dosed relatively precisely. Despite the increasing number of publications describing the use of this model organism, there is a high variability with regard to how the model is produced in different laboratories, with respect to larva size, age, origin, storage, and rest periods, as well as dosing for infection and treatment. Here, we provide suggestions regarding how some of these factors can be approached, to facilitate the comparability of studies between different laboratories. We introduce a linear regression curve correlating the total larva weight to the liquid volume in order to estimate the in vivo concentration of pathogens and the administered drug concentration. Finally, we discuss several other aspects, including in vivo antibiotic stability in larvae, the infection doses for different pathogens and suggest guidelines for larvae selection.
Insights
The greater wax moth (Galleria mellonella) larvae are a popular infection model, but studies vary widely. This research offers guidelines for standardizing Galleria mellonella larva use in infection studies to improve comparability.
Area of Science:
- Microbiology
- Infectious Diseases
- Invertebrate Models
Background:
- The greater wax moth (Galleria mellonella) larva is an increasingly popular non-mammalian model for infection studies.
- Its ability to be incubated at 37 °C and precise dosing makes it advantageous over other invertebrate models.
- However, significant variability exists in experimental protocols across laboratories, hindering result comparability.
Purpose of the Study:
- To provide standardized guidelines for using Galleria mellonella larvae in infection research.
- To enhance the comparability and reproducibility of studies utilizing this model organism.
- To address variability in larva selection, preparation, and experimental procedures.
Main Methods:
- Development of a linear regression curve to correlate larva weight with liquid volume for accurate in vivo concentration estimation.
- Analysis of factors influencing experimental outcomes, including larva size, age, origin, storage, and rest periods.
- Discussion of pathogen infection doses and in vivo antibiotic stability within larvae.
Main Results:
- A method is introduced to estimate in vivo pathogen and drug concentrations using larva weight and liquid volume.
- Guidelines are suggested for larva selection and preparation to minimize experimental variability.
- Recommendations are provided for optimizing infection doses and understanding antibiotic stability.
Conclusions:
- Standardizing protocols for Galleria mellonella larva use is crucial for improving inter-laboratory study comparability.
- The proposed regression curve aids in precise concentration determination for pathogens and drugs.
- Adherence to suggested guidelines will enhance the reliability and reproducibility of findings in infection research using this model.
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