title: Cloning properties of T lymphocyte subpopulations after treatment with 8-methoxypsoralen and UVA irradiation.
abstract: The cloning rate of PHA-stimulated T lymphocytes after treatment with 8-methoxypsoralen plus UVA irradiation described by Wunder and Reischmann (1983) gives a linear dose-effect relationship at low dosages. However, with increasing doses a flattening of the negative gradient occurs. This relationship deviates from the classical exponential curve which can be observed when fibroblasts are treated with mutagens and which is explainable by a 'recovery plateau' at lower dosages. In this study we show that some subpopulations of T lymphocytes, in particular the T-helper and T-suppressor cells, influence the overall dose-effect relationship. These isolated subpopulations exhibit varying sensitivities in comparison with their depleted cell populations. It may be assumed that heterogeneous cell populations exist within each isolated subpopulation which may be separated into further subclasses according to their specific sensitivity.
authors.affiliation: Department of General Pediatrics, University Children's Hospital, Kiel, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Nikischin
authors.forename: A
authors.initials: A
authors.lastname: Siebel-Sauer
authors.forename: E
authors.initials: E
authors.lastname: Wunder
authors.forename: M
authors.initials: M
authors.lastname: Schroeder-Kurth
mesh_terms: D002999:Clone Cells / Q000187:drug effects / Q000528:radiation effects; D004305:Dose-Response Relationship, Drug; D004307:Dose-Response Relationship, Radiation; D006801:Humans; D008730:Methoxsalen / Q000494:pharmacology*; D009152:Mutagenicity Tests; D006377:T-Lymphocytes, Helper-Inducer / Q000166:cytology / Q000187:drug effects* / Q000528:radiation effects; D050378:T-Lymphocytes, Regulatory / Q000166:cytology / Q000187:drug effects* / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D008730:Methoxsalen