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Androgen receptor-beta mRNA levels in different tissues in breeding and post-breeding male and female sticklebacks, Gasterosteus aculeatus
Department of Zoology, Stockholm University, Stockholm, Sweden.
Örebro University, School of Science and Technology. (Örebro Life Science Center)
Örebro University, School of Science and Technology. (Örebro Life Science Center)ORCID iD: 0000-0002-8157-7834
Örebro University, School of Science and Technology. (Örebro Life Science Center)ORCID iD: 0000-0001-7336-6335
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2012 (English)In: Reproductive Biology and Endocrinology, ISSN 1477-7827, E-ISSN 1477-7827, Vol. 10, article id 23Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Androgens induce male characters by activating androgen receptors (AR). Previous quantitative studies on AR in fishes have been limited to few tissues and/or a single season/reproductive state. The aim of this investigation was to study the possible role of AR-beta expression levels in the control of male traits in the three-spined stickleback. To that end, AR-beta expression levels in major tissues in breeding and post-breeding male and female sticklebacks were examined.

METHODS: AR-beta mRNA levels were quantified in ten tissues; eye, liver, axial muscle, heart, brain, intestine, ovary, testis, kidney and pectoral muscle in six breeding and post-breeding males and females using reverse transcription quantitative PCR.

RESULTS: Breeding in contrast to post-breeding males built nests and showed secondary sexual characters (e.g. kidney hypertrophy) and elevated androgen levels. Post-breeding females had lower ovarian weights and testosterone levels than breeding females. AR-beta was expressed in all studied tissues in both sexes and reproductive states with the highest expression in the gonads and in the kidneys. The kidney is an androgen target organ in sticklebacks, from which breeding males produce the protein spiggin, which is used in nest-building. There was also high AR-beta expression in the intestine, an organ that appears to take over hyperosmo-regulation in fresh water when the kidney hypertrophies in mature males and largely loses this function. The only tissue that showed effects of sex or reproductive state on AR-beta mRNA levels was the kidneys, where post-breeding males displayed higher AR-beta mRNA levels than breeding males.

CONCLUSION: The results indicate that changes in AR-beta mRNA levels play no or little role in changes in androgen dependent traits in the male stickleback.

Place, publisher, year, edition, pages
BioMed Central, 2012. Vol. 10, article id 23
National Category
Biological Sciences Endocrinology and Diabetes
Research subject
Biology
Identifiers
URN: urn:nbn:se:oru:diva-22610DOI: 10.1186/1477-7827-10-23ISI: 000304475800001PubMedID: 22455382Scopus ID: 2-s2.0-84858974000OAI: oai:DiVA.org:oru-22610DiVA, id: diva2:517192
Funder
Knowledge FoundationSwedish Research Council FormasAvailable from: 2012-04-22 Created: 2012-04-22 Last updated: 2018-05-08Bibliographically approved

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Karlsson, JohnnyOlsson, Per-Erik

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