title: Aggregation behavior and in vitro biocompatibility study of octopus-shaped macromolecules based on tert-butylcalix[4]arenes.
abstract: A series of products based on tert-butylcalix[4]arene have been synthesized by anionic polymerization of ethylene oxide. The resulting products are amphiphilic octopus-shaped macromolecules, consisting of a hydrophobic calix[4]arene core and four arms of hydrophilic poly(ethylene oxide) chains. In aqueous solutions the polyoxyethylated tert-butylcalix[4]arenes were found to self-associate above certain CMC determined by dye solubilization technique. The light scattering study reveals that the polyoxyethylated tert-butylcalix[4]arenes form aggregates of narrow size distribution and hydrodynamic diameters ranging from about 155 to 245 nm and aggregation numbers from tens to hundreds macromolecules per particle depending on the degree of polymerization of the PEO chains. An in vitro biocompatibility study showed that the tested compounds are practically devoid of intrinsic cytotoxic and hemolytic effects and moreover they failed to modulate the mitogen-induced interleukin-2 release from the human T-lymphocyte cell line Jurkat E6-1. Taken together the excellent in vitro biocompatibility profile and the favorable physicochemical characteristics of the tested polyoxyethylated calix[4]arenes give us reason to consider them as promising for further evaluation as drug delivery platforms.
authors: Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Medical University-Sofia, 2 Dunav St., 1000 Sofia, Bulgaria. dmomekova@yahoo.com
authors: Denitsa
authors: D
authors: Momekova
authors: Desislava
authors: D
authors: Budurova
authors: Elena
authors: E
authors: Drakalska
authors: Stoycho
authors: S
authors: Shenkov
authors: Georgi
authors: G
authors: Momekov
authors: Barbara
authors: B
authors: Trzebicka
authors: Nikolay
authors: N
authors: Lambov
authors: Emil
authors: E
authors: Tashev
authors: Stanislav
authors: S
authors: Rangelov
mesh_terms: D047250:Calixarenes / Q000737:chemistry* / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D004912:Erythrocytes / Q000187:drug effects / Q000502:physiology; D006461:Hemolysis / Q000187:drug effects; D006801:Humans; D007376:Interleukin-2 / Q000378:metabolism; D011092:Polyethylene Glycols / Q000737:chemistry / Q000494:pharmacology
chemical_list: D007376:Interleukin-2; C525100:para-tert-butylcalix(4)arene; D047250:Calixarenes; D011092:Polyethylene Glycols