title: Comparative study on cardiotoxic effect of Tinuvin 770: a light stabilizer of medical plastics in rat model.
abstract: Tinuvin 770 [bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate], is a UV light stabilizer plastic additive used worldwide. It is a component of many plastic materials used in medical and food industries. Earlier studies demonstrated its in vitro L-type Ca2+ channel and nicotinic acetylcholine receptor blocking properties. Our previous experiments have proved the toxic effects of Tinuvin 770 on isolated rat cardiomyocytes. The present study investigates the cardiotoxic effects of Tinuvin 770 in vivo. Wistar rats were intraperitoneally injected with increasing doses of Tinuvin 770 (1, 10, 100 microg, and 1 mg) 15 times during a 5-week period. Myocardial samples were analyzed by light, electron, and fluorescent microscopy. The lead-acetate method was used to detect intracellular Ca2+, and glyoxylic acid technique to assess alteration in adrenergic innervation. Focal myocytolysis and hypercontraction necrosis could be observed in rats treated with higher doses of Tinuvin 770. In these groups, intracellular Ca2+ accumulation and increased catecholamine release were detected. Tinuvin 770 not only displays L-type Ca2+ channel blocking properties, but can also lead to catecholamine release, similar to effects of the first generation of L-type Ca2+ channel blockers. Morphological results correspond to catecholamine-induced myocardial damage. Current literature, as well as our study, indicates that more detailed toxicological analysis of Tinuvin 770 should be required, and current regulations in medical and food industries should adopt the new results.
authors.affiliation: Department of Transplantation and Surgery, Semmelweis University, Budapest, Hungary, 1082. sotonyi@hotmail.com
authors.forename: Péter
authors.initials: P
authors.lastname: Sótonyi
authors.forename: Béla
authors.initials: B
authors.lastname: Merkely
authors.forename: Márta
authors.initials: M
authors.lastname: Hubay
authors.forename: Jeno
authors.initials: J
authors.lastname: Járay
authors.forename: Endre
authors.initials: E
authors.lastname: Zima
authors.forename: Pál
authors.initials: P
authors.lastname: Soós
authors.forename: Anikó
authors.initials: A
authors.lastname: Kovács
authors.forename: István
authors.initials: I
authors.lastname: Szentmáriay
mesh_terms: D000818:Animals; D002118:Calcium / Q000032:analysis / Q000378:metabolism; D002121:Calcium Channel Blockers / Q000008:administration & dosage / Q000633:toxicity*; D020746:Calcium Channels, L-Type / Q000187:drug effects; D003652:Decanoic Acids / Q000008:administration & dosage / Q000737:chemistry / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D004864:Equipment and Supplies; D005260:Female; D006321:Heart / Q000187:drug effects*; D007274:Injections, Intraperitoneal; D008297:Male; D009206:Myocardium / Q000473:pathology* / Q000648:ultrastructure; D009336:Necrosis; D009638:Norepinephrine / Q000652:urine; D010880:Piperidines / Q000008:administration & dosage / Q000737:chemistry / Q000633:toxicity*; D010969:Plastics / Q000737:chemistry*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D002121:Calcium Channel Blockers; D020746:Calcium Channels, L-Type; D003652:Decanoic Acids; D010880:Piperidines; D010969:Plastics; C083752:Tinuvin 770; D002118:Calcium; D009638:Norepinephrine