Hc (Haemonchus contortus) / sensitive / resistant
Tc (Trichostrongylus colubriformis) / sensitive / resistant
Ac (Ancylostoma caninum)
Ag (Ascaridia galli)

Treatment exposure modality:	Immersion for 4 hours to 24h
Efficacy type:	Migration reduction (%)
Stock solution:	20 mM in DMSO
Volume / datapoint:	2.5 μL (triplicates)
Starting concentration:	25 μM

In Brief:

The Invenesis Migration Trap Assay (MTA) measures the effect of compounds on L₃ of nematodes.

L₃ of a gastrointestinal nematode are exposed to the treatment in each well of a multi-well plate. After 4 to 24 hours, the worms are transferred into a migration plate causing a 4-fold dilution of the test compound. The migration of the worms towards a destination trap is measured over time and efficacy is expressed as a % reduction of migration compared to negative controls.

Definitions:

To ensure flawless communication, the following definition section introduces the vocabulary used at INVENesis. You will find this vocabulary on our quotes, raw data files, processed data files, preliminary and final reports. Open the Lexicon below.

Lexicon

Assay Preparation:

Test plate: microplate in which an assay is run
Mother plate: microplate containing stock solutions
Stock solution: solution contained in mother plates out of which dilutions will be made
Daugher plate: microplate containing solutions used to treat test plates, usually dilution series

Type of Assays:

Organism-based assays : functional assay measuring a phenotypic response on a whole organism. Typically, motility, development, deterrency, repellency.
Electrophysiology assays: functional assay measuring the electrical respons of a receptor or an organ to a stimulus
Stock solution: solution contained in mother plates out of which dilutions will be made
Daugher plate: microplate containing solutions used to treat test plates, usually dilution series

Treatment exposure modalities:

Treatment modalities relate to the way the treatment is applied. Different treatment modalities help define how an active ingredient is most susceptible to act in a field case. Some compounds are more active when eaten, others are more active when applied externally on an organism. The following vocabulary is used in the list of assays:

Tarsal:

Tarsal: individuals are allowed to walk on surfaces treated with a formulated active ingredient.
Tarsal with choice: only a proportion of the surface accessible to individuals is treated.
Tarsal without choice: the whole surface accessible to individuals is treated so that individuals are unable to rest on untreated surfaces.

Topical:

Topical: direct application of a known amount of formulated active ingredient on a single individual

Oral:

Oral: voluntary feeding on medium treated with a formulated active ingredient.
Oral with choice: both a treated and an untreated medium are provided.
Oral without choice: only one treated medium is provided.

Immersion:

Immersion: individuals are immersed in a treated formulation.
Permanent Immersion: individuals are immersed for the whole duration of the assay.
Temporary Immersion: the treatment is removed after temporary immersion of individuals.