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Related Concept Videos

Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Agonism and Antagonism: Quantification01:14

Agonism and Antagonism: Quantification

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.
To quantify these effects, researchers use a dose-response curve, which provides valuable information about the potency and efficacy of a drug. Potency refers to...
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Consider a circuit with two sinusoidal voltage sources. Each one influences the circuit independently, and the superposition principle helps us understand the combined effect by adding up the responses from each source.
Superposition Theorem01:18

Superposition Theorem

The superposition principle is a fundamental concept stating that in a linear circuit, the voltage across (or current through) an element can be determined by summing the individual contributions of each independent source acting in isolation. When dealing with linear circuits containing multiple independent sources, this principle serves as a valuable tool for analysis. To apply the superposition principle effectively, one should focus on a single independent source at a time while...
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Another way in which a group presence can affect performance is social loafing—the exertion of less effort by a person working together with a group. Social loafing occurs when our individual performance cannot be evaluated separately from the group. Thus, group performance declines on easy tasks (Karau & Williams, 1993). Essentially individual group members loaf and let other group members pick up the slack. Because each individual’s efforts cannot be evaluated, individuals become less...
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The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...

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Diagonal Method to Measure Synergy Among Any Number of Drugs
12:08

Diagonal Method to Measure Synergy Among Any Number of Drugs

Published on: June 21, 2018

Understanding synergy.

Nori Geary1

  • 1ndg47@hotmail.com

American Journal of Physiology. Endocrinology and Metabolism
|December 6, 2012
PubMed
Summary
This summary is machine-generated.

Quantifying synergistic effects in physiology is complex. Current mathematical models for supra-additive synergy are flawed; a simpler definition of cooperative, non-antagonistic effects is recommended for research and therapy development.

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Area of Science:

  • Integrative physiology
  • Endocrinology
  • Pharmacology

Background:

  • Analyzing combined hormonal or manipulative effects is crucial in endocrinology and integrative physiology.
  • Functional synergy analysis relies on quantifying supra-additive effects, often using dose-effect curve addition.
  • Existing quantitative synergy metrics face mathematical and practical challenges.

Purpose of the Study:

  • To review the mathematical soundness, validity, and utility of common supra-additive synergy approaches.
  • To identify limitations in current quantitative synergy metrics.
  • To propose an alternative, simpler definition of synergy.

Main Methods:

  • Review of mathematical theories and common approaches for synergy quantification (response additivity, Loewe additivity).
  • Evaluation of these approaches based on mathematical soundness, face validity, and utility.
  • Comparison of quantitative approaches with a qualitative definition of synergy.

Main Results:

  • Serious mathematical and practical problems were identified in response additivity and Loewe additivity (isobole/response surface) approaches.
  • No generally applicable, mathematically sound supra-additive synergy metric was found suitable for integrative physiology.
  • The simpler definition of synergy as a cooperative (non-antagonistic) effect avoids mathematical complexities.

Conclusions:

  • Current quantitative metrics for supra-additive synergy in endocrinology and integrative physiology are inadequate.
  • Abandoning complex metrics in favor of a cooperative effect definition is recommended.
  • A simple synergy definition facilitates research, meets regulatory needs, and aids in developing combination therapies.