title: Correspondence analysis applied to steroid receptor binding.
abstract: The relative binding affinities of 48 steroids for four classes of hormone receptor (progestin, PR; androgen, AR; glucocorticoid, GR; mineralocorticoid, MR) have been analyzed by correspondence analysis. The steroids were, for the most part, derivatives of nortestosterone, differing by their degree of unsaturation, by the presence or absence of a 17 alpha-ethynyl group, and by the length of the C-13 alkyl substituent. Derivatives of norprogesterone were included as reference compounds. Distribution maps visualizing the results of the mathematical analysis revealed that the majority of the test steroids were within the zone of influence of AR and PR and had limited affinity for GR and MR. Overall lack of specificity and enhanced affinity for GR and MR were induced by increasing unsaturation and by the presence of a C-13 ethyl group. The general and specific conclusions of the analysis confirm and extend previous intuitive and partial interpretations of the data. Correspondence analysis, however, has the advantage of taking into account the sum total of the available information, without any preconceived notion of the relative importance of a specific structural feature or biological parameter and, furthermore, enables simultaneous representation on a single graph of the receptor and steroid fields. The present example demonstrates the use of this type of methodology in processing routine screening data involving multiple parameters.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D009277:Nandrolone / Q000031:analogs & derivatives*; D011944:Receptors, Androgen / Q000378:metabolism*; D011965:Receptors, Glucocorticoid / Q000378:metabolism*; D018161:Receptors, Mineralocorticoid; D011980:Receptors, Progesterone / Q000378:metabolism*; D011987:Receptors, Steroid / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: D011944:Receptors, Androgen; D011965:Receptors, Glucocorticoid; D018161:Receptors, Mineralocorticoid; D011980:Receptors, Progesterone; D011987:Receptors, Steroid; D009277:Nandrolone