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Wold M, Beckmann M, Poitra S, Espinoza A, Longie R, Mersereau E, Darland DC, Darland T. The longitudinal effects of early developmental cadmium exposure on conditioned place preference and cardiovascular physiology in zebrafish. Aquat Toxicol 2017; 191:73-84. [PMID: 28804037 PMCID: PMC5764186 DOI: 10.1016/j.aquatox.2017.07.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 07/25/2017] [Accepted: 07/27/2017] [Indexed: 05/05/2023]
Abstract
Cadmium (Cd) is a naturally occurring trace metal that is widely considered to be highly toxic to aquatic organisms and a significant health hazard to humans (Amzal et al., 2009; Bernhoft 2013; Burger, 2008; Satarug et al., 2009). The zebrafish (Danio rerio) has been used as a model organism for toxicological studies with Cd (Banni et al., 2011; Blechinger et al., 2007; Chow et al., 2009; Chow et al., 2008; Favorito et al., 2011; Kusch et al., 2007; Matz et al., 2007; Wang and Gallagher, 2013). We asked what the lasting longitudinal effects would be from short early developmental Cd exposure (between 24 and 96h post-fertilization) in a range that larvae might experience living atop typical Cd-containing surface sediments (0, 0.01, 0.1, 1.0 and 10μM CdCl2: 1.124, 11.24, 112.4 and 1124μg Cd/L). The goal of this exposure window was to specifically target secondary neurogenesis, monoaminergic differentiation and cardiovascular development, without affecting earlier patterning processes. Developmental abnormalities in body size and CNS morphology increased with concentration, but were statistically significant only at the highest concentration used (10μM). Heart rate for Cd-treated larvae increased with concentration, and was significant even at the lowest concentration used (0.01μM). Longitudinal survival was significantly lower for fish developmentally exposed to the highest concentration. Except for brain weight, overall morphology was not affected by developmental Cd exposure. However, developmental exposure to lower concentrations of Cd (0.01, 0.1, and 1.0μM) progressively lowered cocaine-induced conditioned place preference (CPP), used to measure function of the reward pathways in the brain. Baseline heart rate was significantly lower in longitudinal fish developmentally exposed to 1.0μM Cd. Cardiovascular response to isoproterenol, a potent ß-adrenergic agonist, in longitudinal adults was also significantly affected by developmental exposure to Cd at low doses (0.01, 0.1 and 1.0μM). Surviving longitudinal adult fish exposed to the highest concentration of Cd showed normal CPP and cardiovascular physiology. The data imply that even lower exposure concentrations can potentially result in fitness-affecting parameters without affecting survival in a laboratory setting.
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Affiliation(s)
- Marissa Wold
- University of North Dakota Biology Department, 10 Cornell Street, Grand Forks, ND, 58202-9019, USA
| | - Myranda Beckmann
- University of North Dakota Biology Department, 10 Cornell Street, Grand Forks, ND, 58202-9019, USA
| | - Shelby Poitra
- University of North Dakota Biology Department, 10 Cornell Street, Grand Forks, ND, 58202-9019, USA
| | - Ana Espinoza
- University of Arizona, Department of Ecology and Evolutionary Biology, Tucson, AZ 85721, USA
| | - Robert Longie
- University of North Dakota Biology Department, 10 Cornell Street, Grand Forks, ND, 58202-9019, USA
| | - Erik Mersereau
- University of North Dakota Biology Department, 10 Cornell Street, Grand Forks, ND, 58202-9019, USA
| | - Diane C Darland
- University of North Dakota Biology Department, 10 Cornell Street, Grand Forks, ND, 58202-9019, USA
| | - Tristan Darland
- University of North Dakota Biology Department, 10 Cornell Street, Grand Forks, ND, 58202-9019, USA.
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Mersereau EJ, Boyle CA, Poitra S, Espinoza A, Seiler J, Longie R, Delvo L, Szarkowski M, Maliske J, Chalmers S, Darland DC, Darland T. Longitudinal Effects of Embryonic Exposure to Cocaine on Morphology, Cardiovascular Physiology, and Behavior in Zebrafish. Int J Mol Sci 2016; 17:ijms17060847. [PMID: 27258254 PMCID: PMC4926381 DOI: 10.3390/ijms17060847] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 04/30/2016] [Accepted: 05/25/2016] [Indexed: 01/05/2023] Open
Abstract
A sizeable portion of the societal drain from cocaine abuse results from the complications of in utero drug exposure. Because of challenges in using humans and mammalian model organisms as test subjects, much debate remains about the impact of in utero cocaine exposure. Zebrafish offer a number of advantages as a model in longitudinal toxicology studies and are quite sensitive physiologically and behaviorally to cocaine. In this study, we have used zebrafish to model the effects of embryonic pre-exposure to cocaine on development and on subsequent cardiovascular physiology and cocaine-induced conditioned place preference (CPP) in longitudinal adults. Larval fish showed a progressive decrease in telencephalic size with increased doses of cocaine. These treated larvae also showed a dose dependent response in heart rate that persisted 24 h after drug cessation. Embryonic cocaine exposure had little effect on overall health of longitudinal adults, but subtle changes in cardiovascular physiology were seen including decreased sensitivity to isoproterenol and increased sensitivity to cocaine. These longitudinal adult fish also showed an embryonic dose-dependent change in CPP behavior, suggesting an increased sensitivity. These studies clearly show that pre-exposure during embryonic development affects subsequent cocaine sensitivity in longitudinal adults.
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Affiliation(s)
- Eric J Mersereau
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Cody A Boyle
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Shelby Poitra
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Ana Espinoza
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA.
| | - Joclyn Seiler
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Robert Longie
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Lisa Delvo
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Megan Szarkowski
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Joshua Maliske
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Sarah Chalmers
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Diane C Darland
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
| | - Tristan Darland
- Biology Department, University of North Dakota, 10 Cornell Street, Grand Forks, ND 58202, USA.
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