title: Opiates: biphasic dose responses.
abstract: It was shown that biphasic responses are commonly reported for opiates with respect to a broad range of animal models and endpoints. These endpoints include such diverse functions as blood pressure, muscle tension, breathing rates, hCG production, HIV production, neutrophil migration, ACTH production, protein binding, and neuronal functioning. Quantitative features of the dose-response relationships indicated that the maximum stimulatory responses were < or = 3-fold greater than the controls with most being between 10 to 70% greater than the controls. In contrast to the striking similarity in the maximum stimulatory response, there was marked variation with respect to the dose range of the stimulatory responses that varied from 10(1) to 10(10). Mechanistic assessments were conducted for most biphasic dose-response relationships and are addressed in detail.
authors.affiliation: Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, Amherst 01003, USA. edwardc@schoolph.umass.edu
authors.forename: E J
authors.initials: EJ
authors.lastname: Calabrese
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000096:biosynthesis; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects*; D002465:Cell Movement / Q000187:drug effects; D006063:Chorionic Gonadotropin / Q000096:biosynthesis; D004305:Dose-Response Relationship, Drug; D006706:Homeostasis / Q000187:drug effects; D006801:Humans; D009119:Muscle Contraction / Q000187:drug effects*; D009294:Narcotics / Q000494:pharmacology*; D009474:Neurons / Q000187:drug effects / Q000502:physiology; D009504:Neutrophils / Q000187:drug effects* / Q000502:physiology; D011485:Protein Binding / Q000187:drug effects; D011957:Receptors, Opioid / Q000502:physiology*; D012119:Respiration / Q000187:drug effects*
chemical_list: D006063:Chorionic Gonadotropin; D009294:Narcotics; D011957:Receptors, Opioid; D000324:Adrenocorticotropic Hormone