title: C₆₀ exposure augments cardiac ischemia/reperfusion injury and coronary artery contraction in Sprague Dawley rats.
abstract: The potential uses of engineered C₆₀ fullerene (C₆₀) have expanded in recent decades to include industrial and biomedical applications. Based on clinical findings associated with particulate matter exposure and our data with multi-walled carbon nanotubes, we hypothesized that ischemia/reperfusion (I/R) injury and pharmacological responses in isolated coronary arteries would depend upon the route of exposure and gender in rats instilled with C₆₀. Male and female Sprague Dawley rats were used to test this hypothesis by surgical induction of cardiac I/R injury in situ 24 h after intratracheal (IT) or intravenous (IV) instillation of 28 μg of C₆₀ formulated in polyvinylpyrrolidone (PVP) or PVP vehicle. Serum was collected for quantification of various cytokines. Coronary artery segments were isolated for assessment of vasoactive pharmacology via wire myography. Both IV and IT exposure to C₆₀ resulted in expansion of myocardial infarction in male and female rats following I/R injury. Serum-collected post-I/R showed elevated concentrations of interleukin-6 and monocyte chemotactic protein-1 in male rats exposed to IV C₆₀. Coronary arteries isolated from male rats exposed to IT C₆₀ demonstrated augmented vasocontraction in response to endothelin-1 that was attenuated with Indomethacin. IV C₆₀ exposure resulted in impaired acetylcholine relaxation in male rats and IT C₆₀ exposure resulted in depressed vasorelaxation in response to sodium nitroprusside in female rats. Based on these data, we conclude that IT and IV exposure to C₆₀ results in unique cardiovascular consequences that may favor heightened coronary resistance and myocardial susceptibility to I/R injury.
authors.affiliation: Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27834.
authors.forename: Leslie C
authors.initials: LC
authors.lastname: Thompson
authors.forename: Rakhee N
authors.initials: RN
authors.lastname: Urankar
authors.forename: Nathan A
authors.initials: NA
authors.lastname: Holland
authors.forename: Achini K
authors.initials: AK
authors.lastname: Vidanapathirana
authors.forename: Joshua E
authors.initials: JE
authors.lastname: Pitzer
authors.forename: Li
authors.initials: L
authors.lastname: Han
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Sumner
authors.forename: Anita H
authors.initials: AH
authors.lastname: Lewin
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Fennell
authors.forename: Robert M
authors.initials: RM
authors.lastname: Lust
authors.forename: Jared M
authors.initials: JM
authors.lastname: Brown
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Wingard
mesh_terms: D000818:Animals; D003331:Coronary Vessels / Q000187:drug effects* / Q000276:immunology / Q000503:physiopathology; D016207:Cytokines / Q000097:blood / Q000276:immunology; D004305:Dose-Response Relationship, Drug; D004785:Environmental Pollutants / Q000633:toxicity*; D005260:Female; D037741:Fullerenes / Q000633:toxicity*; D019570:Inhalation Exposure; D007275:Injections, Intravenous; D008297:Male; D009203:Myocardial Infarction / Q000139:chemically induced* / Q000209:etiology / Q000276:immunology / Q000503:physiopathology; D015428:Myocardial Reperfusion Injury / Q000139:chemically induced* / Q000150:complications / Q000276:immunology / Q000503:physiopathology; D051381:Rats; D017207:Rats, Sprague-Dawley; D012737:Sex Factors; D014655:Vascular Resistance / Q000187:drug effects; D014661:Vasoconstriction / Q000187:drug effects*
chemical_list: D016207:Cytokines; D004785:Environmental Pollutants; D037741:Fullerenes; C069837:fullerene C60
keywords: acetylcholine; cytokines; endothelin-1; fullerene; myocardial infarction; nanotoxicology