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When drugs are administered, they can elicit either an agonist or antagonist effect on the body. Agonism occurs when a drug activates a specific receptor, triggering a biological response. On the other hand, antagonism happens when a drug binds to the same receptors but blocks their activation, thereby preventing a biological response.
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Diagonal Method to Measure Synergy Among Any Number of Drugs
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Determining lower threshold concentrations for synergistic effects.

Maj-Britt Andersen Bjergager1, Kristoffer Dalhoff1, Andreas Kretschmann1

  • 1Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.

Aquatic Toxicology (Amsterdam, Netherlands)
|November 23, 2016
PubMed
Summary

This study found a threshold concentration for azole fungicides below which they do not synergize with alpha-cypermethrin in Daphnia magna. Longer test durations revealed lower synergy thresholds, indicating environmental relevance.

Keywords:
Azole fungicidesDaphnia magnaMixturesPyrethroid insecticidesSynergyThreshold concentrations

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Area of Science:

  • Environmental toxicology
  • Aquatic toxicology
  • Ecotoxicology

Background:

  • Synergistic interactions between chemicals are rare but significant, yet often studied at unrealistic concentrations.
  • Determining threshold concentrations for synergy is crucial for realistic environmental risk assessment.

Purpose of the Study:

  • To identify the threshold concentration below which azole fungicides do not exhibit synergistic effects with alpha-cypermethrin on Daphnia magna.
  • To compare different testing approaches for estimating the lower threshold for synergy.
  • To evaluate the influence of test duration on observed synergy thresholds.

Main Methods:

  • Investigated synergistic interactions between alpha-cypermethrin and three azole fungicides (prochloraz, propiconazole, epoxiconazole) using Daphnia magna.
  • Employed three experimental setups: standard 48h acute toxicity test, 48h passive dosing test, and a 14-day test.
  • Defined synergy based on deviations from concentration addition (horizontal assessment) and independent action (vertical assessment) models.

Main Results:

  • Confirmed a lower azole threshold concentration below which synergy with alpha-cypermethrin was not observed.
  • Observed that lower threshold concentrations decreased with increasing test duration.
  • Concentration addition assessments yielded more conservative synergy threshold values compared to independent action assessments.

Conclusions:

  • Test duration significantly impacts the assessment of chemical synergy, with longer tests revealing lower thresholds.
  • Azole concentrations within typical monitoring ranges (up to 0.5μgL⁻¹) are unlikely to cause significant synergy leading to Daphnia magna immobilization.
  • Enzyme induction may explain antagonistic effects observed below the synergy threshold.