Volume 2016, Issue 1 7142868
Research Article
Open Access

Netrin-1 Peptide Is a Chemorepellent in Tetrahymena thermophila

Heather Kuruvilla

Corresponding Author

Heather Kuruvilla

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Bradley Schmidt

Bradley Schmidt

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Stephanie Song

Stephanie Song

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Marian Bhajjan

Marian Bhajjan

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Matthew Merical

Matthew Merical

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Caleb Alley

Caleb Alley

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Christopher Griffin

Christopher Griffin

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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David Yoder

David Yoder

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Josephine Hein

Josephine Hein

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Daniel Kohl

Daniel Kohl

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Cambria Puffenberger

Cambria Puffenberger

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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David Petroff

David Petroff

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Elise Newcomer

Elise Newcomer

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Kortney Good

Kortney Good

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Graham Heston

Graham Heston

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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Anna Hurtubise

Anna Hurtubise

Cedarville University, Cedarville, OH 45314, USA cedarville.edu

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First published: 31 March 2016
Academic Editor: Hubert Vaudry

Abstract

Netrin-1 is a highly conserved, pleiotropic signaling molecule that can serve as a neuronal chemorepellent during vertebrate development. In vertebrates, chemorepellent signaling is mediated through the tyrosine kinase, src-1, and the tyrosine phosphatase, shp-2. Tetrahymena thermophila has been used as a model system for chemorepellent signaling because its avoidance response is easily characterized under a light microscope. Our experiments showed that netrin-1 peptide is a chemorepellent in T. thermophila at micromolar concentrations. T. thermophila adapts to netrin-1 over a time course of about 10 minutes. Netrin-adapted cells still avoid GTP, PACAP-38, and nociceptin, suggesting that netrin does not use the same signaling machinery as any of these other repellents. Avoidance of netrin-1 peptide was effectively eliminated by the addition of the tyrosine kinase inhibitor, genistein, to the assay buffer; however, immunostaining using an anti-phosphotyrosine antibody showed similar fluorescence levels in control and netrin-1 exposed cells, suggesting that tyrosine phosphorylation is not required for signaling to occur. In addition, ELISA indicates that a netrin-like peptide is present in both whole cell extract and secreted protein obtained from Tetrahymena thermophila. Further study will be required in order to fully elucidate the signaling mechanism of netrin-1 peptide in this organism.

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