An example originally described by Bliss involves an organism that dies from the effects of two distinct compounds. (2000). Model.

Those two models, described as follows, are the Bliss Independence model and the Loewe Additivity model.

A Bayesian approach to dose-response assessment and synergy and its application to in vitro dose-response studies.

Additionally, this model can be extended to more than 2 compounds (Berenbaum, 1977; Goldoni and Johansson, 2007), where the equation becomes: As with all models, there are limitations and assumptions made. Population pharmacodynamics refers to the study of the variability in pharmacological effects of drugs between individuals when standard dosage regimens of drugs are administered [51]. Another example of this has been shown to between anticancer drugs edatrexate and cisplatin as well as methotrexate and cisplatin, resulting in the ability to use lower doses of each drug in combination while maintaining the same cell death levels as when using higher doses of these drugs individually (Chou et al., 1993). Analysis plans are often underspecified, and reporting quality is highly variable [17]. (2007). Example of curves with a constant potency ratio. Toxicol. The search for cytotoxic synergy between anticancer agents: a case of Dorothy and the ruby slippers? Pharmacogenomics 12, 1407–1415. Liu notes that phytochemicals in different foods, that help with cancer prevention, have potential synergistic interactions and that a complex mixture of them is present in whole foods (Liu, 2004). Exp.

However, there are limitations to the model which will be discussed later. An isobologram is a graphical procedure in which doses of one compound are displayed along one axis and doses of a second compound are displayed along the second axis. The problem of mathematically defining additivity has been the center of controversy among leading researchers of this topic for the last century. One of the older methods for assessing interaction effects and potential synergy was developed by Marking (1977). A genome-wide association analysis of temozolomide response using lymphoblastoid cell lines reveals a clinically relevant association with MGMT. J. Genomics 22, 796–802. This model has also been mathematically rewritten, and even directly referred to, as the sigmoid Emax model, or simply the Emax model or sigmoidal model (Goutelle et al., 2008). Criteria for analyzing interactions between biologically active agents. 114, 413–431. Br. 9.2.4 Mixed Micellar Characterization. 78(3 Suppl), 508S–513S. Biol. The expected effect of a combination of agents: the general solution. R. Soc. Pharmacodynamics (PD) is the quantitative study of the relationship between drug exposure (concentrations or dose) and pharmacologic or toxicologic responses. 70, 440–446. a body organ, medicine, etc., that cooperates with another or others to produce or enhance an effect. Biol. It is also worth noting that while modeling dose-response curves is often a necessary step in many of the synergy detection methods, it is not always a simple task, especially when the curves are nonlinear. Exp. Examples of synergism in a sentence, how to use it. In fact, Bliss originally published his famous reference model, Bliss Independence, in a publication titled “The Toxicity of Applied Poisons” (Bliss, 1939).


Definition It is defined as “an alternation in the duration or magnitude of pharmacological effects of one drug produced by another drug, food, or any other substance”. There have been many attempts at trying to define the best reference model for the general case as well as for specific situations.

The use of different “jargon” is a challenge for interdisciplinary research, as it limits cross-talk across methods developed in different domain applications. The addition of a complement-fixing monoclonal antibody, rituximab, to cyclophosphamide, hydroxydaunomycin, Oncovin, and prednisone (CHOP) therapy in non-Hodgkin's lymphoma increases the overall response without increasing toxicities (Weiner, 2010). Given this, consider two compounds (drugs, chemicals, etc. Metab. Mike Hallworth, in Clinical Biochemistry: Metabolic and Clinical Aspects (Third Edition), 2014. ), A and B, that act independently of each other. The second group of interactions are labeled antagonistic, when the main action of an index drug is opposed by another, such as between beta-adrenoreceptor antagonists and beta agonists.


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