Abstract
Neuronal connectivity is dependent on size and shape of the dendritic arbor. However, mechanisms controlling dendritic arborization, especially in the peripheral nervous system, are not completely understood. Previous studies have shown that bone morphogenetic proteins (BMPs) are important initiators of dendritic growth in peripheral neurons. In this study, we examined the hypothesis that post-transcriptional regulation mediated by microRNAs (miRNAs) is necessary for BMP-7-induced dendritic growth in these neurons. To examine the role of miRNAs in BMP-7-induced dendritic growth, microarray analyses was used to profile miRNA expression in cultured sympathetic neurons from the superior cervical ganglia of embryonic day 21 rat pups at 6 and 24 h after treatment with BMP-7 (50 ng/mL). Our data showed that BMP-7 significantly regulated the expression of 43 of the 762 miRNAs. Of the 43 miRNAs, 22 showed robust gene expression; 14 were upregulated by BMP-7 and 8 were downregulated by BMP-7. The expression profile for miR-335, miR-664-1*, miR-21, and miR-23b was confirmed using qPCR analyses. Functional studies using morphometric analyses of dendritic growth in cultured sympathetic neurons transfected with miRNA mimics and inhibitors indicated that miR-664-1*, miR-23b, and miR-21 regulated early stages of BMP-7-induced dendritic growth. In summary, our data provide evidence for miRNA-mediated post-transcriptional regulation as important downstream component of BMP-7 signaling during early stages of dendritic growth in sympathetic neurons.
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We thank Donald Bruun and Hao Chen at UC Davis for assistance in setting up and maintaining sympathetic cultures.
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This work was supported by the Saint Mary’s College Summer Research Program (KP, ST, TB) Faculty Development Fund (VC), Faculty Research Grant (VC), and by the National Institute of Environmental Health Sciences (grants ES014901 and ES017592 to PJL). The funding agencies were not involved in the study design, in the collection, analysis, or interpretation of data, in the writing of the report, or in the decision to submit the paper for publication.
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KP did most of the qpCR analysis and the functional studies on individual miRNAs, and helped draft the manuscript. KW completed the functional studies, ST did the microarray studies, and TB and KT helped with the optimization of the qPCR analysis and the functional studies using GAPDH siRNA. PL provided the funding and resources for animal work, and VC designed the study, provided some of the funding for the study, isolated neurons for the study, supervised the students during experimental setup and data analysis, and wrote the manuscript.
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of University of California at Davis and Saint Mary’s College of California, where these studies were conducted. This article does not contain any studies with human participants performed by any of the authors.
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Pravoverov, K., Whiting, K., Thapa, S. et al. MicroRNAs are Necessary for BMP-7-induced Dendritic Growth in Cultured Rat Sympathetic Neurons. Cell Mol Neurobiol 39, 917–934 (2019). https://doi.org/10.1007/s10571-019-00688-2
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DOI: https://doi.org/10.1007/s10571-019-00688-2