Ic50 Dose Response
Ic50 Dose Response - Related Videos
01:03
Dose-Response Relationship: Overview
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2023
Agonists can bind with and activate receptors, resulting in the formation of drug-receptor complexes. Once formed, these complexes catalyze many biochemical processes at the cellular level and subsequently induce a pharmacologic response. The degree of response is directly proportional to the fraction of activated receptors, which in turn, depends on the concentration of the drug at the receptor site as well as the sensitivity of the receptor. An increase in the administered dose contributes to...
01:22
Dose-Response Relationship: Potency and Efficacy
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2023
The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it produces...
01:25
Dose-Response Relationship: Selectivity and Specificity
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2023
Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...
01:21
Dose Response Curve: Conventional Versus Nonmonotonic
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2026
The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response relationships...
09:38
Establishing Dual Resistance to EGFR-TKI and MET-TKI in Lung Adenocarcinoma Cells In Vitro with a 2-step Dose-escalation Procedure
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Cited by 4 •
2017
An in vitro method for establishing dual resistance to an EGFR-TKI and a MET-TKI in cancer cells is described. This method is useful for developing treatments for patients with EGFR-mutations, who exhibit disease progression despite EGFR-TKI treatment with MET-amplification. It can also be modified for inhibitors targeting other molecules.
FAQs
Nonlinear regression converts the measured activities across concentrations into a fitted concentration-response curve rather than relying on a single observed data point. Using the concentration values on a logarithmic scale helps represent the tested range and supports estimation of the concentration associated with 50% inhibition. The fitted result provides a quantitative basis for comparing inhibitory potency.
An IC50 value gains meaning only in relation to the assay design and the conditions under which activity was measured. Differences in the biological system, measured activity, concentration range, or experimental setup can affect the resulting curve and estimated value. Therefore, researchers should interpret potency comparisons alongside the conditions used to generate each measurement.
Direct comparison requires caution because values are tied to the biological system and assay design used to obtain them. A compound tested against cells, an enzyme, or another system may produce results that are not directly equivalent. Comparing values is more informative when the measured activity and experimental conditions are sufficiently similar or are explicitly considered.
Researchers first select a biological system and expose it to a series of increasing substance concentrations. They then measure the relevant activity at each concentration, organize the resulting concentration-activity data, and fit those measurements to a response curve. The fitted curve is used to estimate the concentration associated with 50% reduction and report the inhibitory potency.
The analysis supports several biological investigations, including drug efficacy studies, enzyme inhibition experiments, antimicrobial testing, and cellular toxicity assessment. In each setting, the concentration-response measurements provide a standardized way to characterize how strongly a substance reduces a selected activity. This makes the method useful for evaluating candidate compounds and comparing their inhibitory effects within an appropriate assay context.
An IC50 result summarizes inhibitory potency for the specific activity and experimental system examined. It can help researchers rank or compare candidate compounds, characterize inhibition in enzyme studies, assess antimicrobial effects, or quantify cellular toxicity. Interpreting the value together with the fitted response curve, assay design, and biological context helps prevent conclusions that exceed what the experiment measured.