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Marine Biology

, 166:140 | Cite as

Melanin-concentrating hormone is not involved in luminescence emission in the velvet belly lanternshark, Etmopterus spinax

  • Laurent DuchateletEmail author
  • Jérôme Delroisse
  • Jérôme Mallefet
Short Note

Abstract

Luminous deep-sea etmopterid sharks use hormonal control to regulate bioluminescence. Melatonin and prolactin trigger light emission and, conversely, α-melanocyte stimulating hormone actively reduces ongoing luminescence. Interestingly, these hormones are also known as regulators of skin pigment motion in teleost fish and epipelagic elasmobranchs. On the other hand, the melanin-concentrating hormone (MCH) is another regulator of the skin pigment motion in fish melanophores. Here, we studied the putative effect of MCH on the light emission control of the velvet belly lanternshark, Etmopterus spinax (Etmopteridae). In parallel, the presence of the MCH receptor in our model is investigated through database searches. Our results show that MCH is not involved in the bioluminescence triggering in the velvet belly lanternshark. Moreover, no MCH receptor transcript was found in a specific transcriptome of the luminous ventral skin of E. spinax.

Notes

Acknowledgements

Authors would like to thank T. Sorlie from the Espegrend Marine Biological Station (University of Bergen, Norway) for the help during E. spinax collection. L.D. is Ph.D. student funded by a FRIA fellowship (F.R.S.-FNRS Belgium). J.D. is postdoctoral researcher at the University de Mons (UMONS) and he is supported by a WISD-PDR Grant from the National Funds for Research (F.R.S.-FNRS Belgium, Project number 29101409). J.M. is Research Associate of the F.R.S.-FNRS.

Author contributions

LD performed, analysed and interpreted the pharmacological tests, performed transcriptome data analysis and was a major contributor in writing the manuscript. JD performed transcriptome and phylogenetic analyses, contributed to and revised the manuscript. JM supervised the work, contributed to and revised the manuscript. All authors read and approved the final manuscript.

Funding

This work was supported by a Grant from the Fonds de la Recherche Scientifique (FRIA/F.R.S.-FNRS, Belgium) to L.D.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

Ethical approval

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 the institution or practice at which the studies were conducted (Animal Ethics Committee of the Catholic University of Louvain in Louvain-la-Neuve, in agreement with the European directive 2010/63/UE).

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Copyright information

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Authors and Affiliations

  1. 1.Marine Biology Laboratory, Earth and Life InstituteCatholic University of LouvainLouvain-La-NeuveBelgium
  2. 2.Research Institute for Biosciences, Biology of Marine Organisms and BiomimeticsUniversity of MonsMonsBelgium

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