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Yaghoobi B, Miller GW, Holland EB, Li X, Harvey D, Li S, Lehmler HJ, Pessah IN, Lein PJ. Ryanodine receptor-active non-dioxin-like polychlorinated biphenyls cause neurobehavioral deficits in larval zebrafish. FRONTIERS IN TOXICOLOGY 2022; 4:947795. [PMID: 36278027 PMCID: PMC9582434 DOI: 10.3389/ftox.2022.947795] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 08/18/2022] [Indexed: 01/28/2023] Open
Abstract
Although their production was banned in the United States in 1977, polychlorinated biphenyls (PCBs) continue to pose significant risks to the developing nervous system. Perinatal exposure to PCBs is associated with increased risk of neuropsychiatric disorders, perhaps due to altered patterns of dendritic arborization of central neurons. Non-dioxin-like (NDL) PCB congeners enhance dendritic arborization of developing mammalian neurons via sensitization of ryanodine receptors (RYR). Structure-activity relationships (SAR) of RYR sensitization by PCBs have been demonstrated using mammalian and rainbow trout (Oncorhynchus mykiss) tissue homogenates. The purpose of this study is to determine whether this SAR translates to developmental neurotoxicity (DNT) of PCBs in vivo, a question that has yet to be tested. To address this gap, we leveraged a zebrafish model to evaluate the developmental neurotoxicity potential of PCBs 28, 66, 84, 95, 138, and 153, congeners previously shown to have broadly different potencies towards sensitizing RYR. We first confirmed that these PCB congeners exhibited differing potency in sensitizing RYR in zebrafish muscle ranging from negligible (PCB 66) to moderate (PCB 153) to high (PCB 95) RYR activity. Next, enzymatically dechorionated embryos were statically exposed to varying concentrations (0.1-10 μM) of each PCB congener from 6 h post-fertilization to 5 days post-fertilization (dpf). Embryos were observed daily using stereomicroscopy to assess mortality and gross malformations and photomotor behavior was assessed in larval zebrafish at 3, 4, and 5 dpf. The body burden of each PCB was measured by gas chromatography. The key findings are: 1) None of these PCBs caused death or overt teratology at the concentrations tested; 2) A subset of these PCB congeners altered photomotor behavior in larval zebrafish and the SAR for PCB behavioral effects mirrored the SAR for RYR sensitization; and 3) Quantification of PCB levels in larval zebrafish ruled out the possibility that congener-specific effects on behavior were due to differential uptake of PCB congeners. Collectively, the findings from this study provide in vivo evidence in support of the hypothesis that RYR sensitization contributes to the DNT of PCBs.
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Affiliation(s)
- Bianca Yaghoobi
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
| | - Galen W. Miller
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
| | - Erika B. Holland
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States,Department of Biological Sciences, California State University of Long Beach, Long Beach, CA, United States
| | - Xueshu Li
- Department of Occupational and Environmental Health, College of Public Health, The University of Iowa, Iowa City, IA, United States
| | - Danielle Harvey
- Department of Public Health Sciences, University of California, Davis, Davis, CA, United States
| | - Shuyang Li
- Department of Public Health Sciences, University of California, Davis, Davis, CA, United States
| | - Hans-Joachim Lehmler
- Department of Occupational and Environmental Health, College of Public Health, The University of Iowa, Iowa City, IA, United States
| | - Isaac N. Pessah
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
| | - Pamela J. Lein
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States,*Correspondence: Pamela J. Lein,
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Zheng L, Lindsay A, McSweeney K, Aplin J, Forbes K, Smith S, Tunwell R, Mackrill JJ. Ryanodine receptor calcium release channels in trophoblasts and their role in cell migration. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2021; 1869:119139. [PMID: 34624436 DOI: 10.1016/j.bbamcr.2021.119139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 09/03/2021] [Accepted: 09/19/2021] [Indexed: 10/20/2022]
Abstract
Trophoblasts are specialized epithelial cells of the placenta that are involved in invasion, communication and the exchange of materials between the mother and fetus. Cytoplasmic Ca2+ ([Ca2+]c) plays critical roles in regulating such processes in other cell types, but relatively little is known about the mechanisms that control this second messenger in trophoblasts. In the current study, the presence of RyRs and their accessory proteins in placental tissues and in the BeWo choriocarcinoma, a model trophoblast cell-line, were examined using immunohistochemistry and Western immunoblotting. Contributions of RyRs to Ca2+ signalling and to random migration in BeWo cells were investigated using fura-2 fluorescent and brightfield videomicroscopy. The effect of RyR inhibition on reorganization of the F-actin cytoskeleton elicited by the hormone angiotensin II, was determined using phalloidin-labelling and confocal microscopy. RyR1 and RyR3 proteins were detected in trophoblasts of human first trimester and term placental villi, along with the accessory proteins triadin and calsequestrin. Similarly, RyR1, RyR3, triadin and calsequestrin were detected in BeWo cells. In this cell-line, activation of RyRs with micromolar ryanodine increased [Ca2+]c, whereas pharmacological inhibition of these channels reduced Ca2+ transients elicited by the peptide hormones angiotensin II, arginine vasopressin and endothelin 1. Angiotensin II increased the velocity, total distance and Euclidean distance of random migration by BeWo cells and these effects were significantly reduced by tetracaine and by inhibitory concentrations of ryanodine. RyRs contribute to reorganization of the F-actin cytoskeleton elicited by angiotensin II, since inhibition of these channels restores the parallelness of these structures to control levels. These findings demonstrate that trophoblasts contain a suite of proteins similar to those in other cell types possessing highly developed Ca2+ signal transduction systems, such as skeletal muscle. They also indicate that these channels regulate the migration of trophoblast cells, a process that plays a key role in development of the placenta.
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Affiliation(s)
- Limian Zheng
- Department of Physiology, University College Cork, Ireland
| | - Andrew Lindsay
- School of Biochemistry and Cell Biology, University College Cork, Ireland
| | - Kate McSweeney
- Department of Physiology, University College Cork, Ireland
| | - John Aplin
- Maternal and Fetal Health Research Centre, University of Manchester, UK
| | - Karen Forbes
- Maternal and Fetal Health Research Centre, University of Manchester, UK; Leeds Centre for Reproduction and Early Development, University of Leeds, UK
| | - Samantha Smith
- Maternal and Fetal Health Research Centre, University of Manchester, UK
| | - Richard Tunwell
- Division of Biosciences, University College London, Gower Street, London, UK
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Li ES, Saha MS. Optimizing Calcium Detection Methods in Animal Systems: A Sandbox for Synthetic Biology. Biomolecules 2021; 11:343. [PMID: 33668387 PMCID: PMC7996158 DOI: 10.3390/biom11030343] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/19/2021] [Accepted: 02/21/2021] [Indexed: 12/16/2022] Open
Abstract
Since the 1970s, the emergence and expansion of novel methods for calcium ion (Ca2+) detection have found diverse applications in vitro and in vivo across a series of model animal systems. Matched with advances in fluorescence imaging techniques, the improvements in the functional range and stability of various calcium indicators have significantly enhanced more accurate study of intracellular Ca2+ dynamics and its effects on cell signaling, growth, differentiation, and regulation. Nonetheless, the current limitations broadly presented by organic calcium dyes, genetically encoded calcium indicators, and calcium-responsive nanoparticles suggest a potential path toward more rapid optimization by taking advantage of a synthetic biology approach. This engineering-oriented discipline applies principles of modularity and standardization to redesign and interrogate endogenous biological systems. This review will elucidate how novel synthetic biology technologies constructed for eukaryotic systems can offer a promising toolkit for interfacing with calcium signaling and overcoming barriers in order to accelerate the process of Ca2+ detection optimization.
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Affiliation(s)
| | - Margaret S. Saha
- Department of Biology, College of William and Mary, Williamsburg, VA 23185, USA;
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