{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T22:18:34Z","timestamp":1772144314186,"version":"3.50.1"},"reference-count":54,"publisher":"Wiley","issue":"24","license":[{"start":{"date-parts":[[2019,12,11]],"date-time":"2019-12-11T00:00:00Z","timestamp":1576022400000},"content-version":"vor","delay-in-days":10,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100000057","name":"National Institute of General Medical Sciences","doi-asserted-by":"publisher","award":["GM 58448"],"award-info":[{"award-number":["GM 58448"]}],"id":[{"id":"10.13039\/100000057","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["bpspubs.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["British J Pharmacology"],"published-print":{"date-parts":[[2019,12]]},"abstract":"<jats:sec><jats:title>Background and Purpose<\/jats:title><jats:p>General anaesthetics can act on synaptic GABA<jats:sub>A<\/jats:sub> receptors by binding to one of three classes of general anaesthetic sites. Canonical drugs that bind selectively to only one class of site are etomidate, alphaxalone, and the mephobarbital derivative, R\u2010mTFD\u2010MPAB. We tested the hypothesis that the general anaesthetic potencies of mixtures of such site\u2010selective agents binding to the same or to different sites would combine additively or synergistically respectively.<\/jats:p><\/jats:sec><jats:sec><jats:title>Experimental Approach<\/jats:title><jats:p>The potency of general anaesthetics individually or in combinations to cause loss of righting reflexes in tadpoles was determined, and the results were analysed using isobolographic methods.<\/jats:p><\/jats:sec><jats:sec><jats:title>Key Results<\/jats:title><jats:p>The potencies of combinations of two or three site\u2010selective anaesthetics that all acted on a single class of site were strictly additive, regardless of which single site was involved. Combinations of two or three site\u2010selective anaesthetics that all bound selectively to different sites always interacted synergistically. The strength of the synergy increased with the number of separate sites involved such that the percentage of each agent's EC<jats:sub>50<\/jats:sub> required to cause anaesthesia was just 35% and 14% for two or three sites respectively. Propofol, which binds non\u2010selectively to the etomidate and R\u2010mTFD\u2010MPAB sites, interacted synergistically with each of these agents.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions and Implications<\/jats:title><jats:p>The established pharmacology of the three anaesthetic binding sites on synaptic GABA<jats:sub>A<\/jats:sub> receptors was sufficient to predict whether a mixture of anaesthetics interacted additively or synergistically to cause loss of righting reflexes in vivo. The principles established here have implications for clinical practice.<\/jats:p><\/jats:sec>","DOI":"10.1111\/bph.14843","type":"journal-article","created":{"date-parts":[[2019,8,27]],"date-time":"2019-08-27T20:03:41Z","timestamp":1566936221000},"page":"4760-4772","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Binding site location on GABA<sub>A<\/sub> receptors determines whether mixtures of intravenous general anaesthetics interact synergistically or additively in vivo"],"prefix":"10.1111","volume":"176","author":[{"given":"Daniel E.","family":"Kent","sequence":"first","affiliation":[{"name":"Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital and Department of Anaesthesia Harvard Medical School  Boston Massachusetts"},{"name":"Department of Health Sciences Northeastern University  Boston Massachusetts"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pavel 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