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- W2107370564 abstract "Circulating androgens in adult reproductively active male vertebrates influence a diversity of organ systems and thus are considered costly. Recently, we obtained evidence that androgen receptors (AR) are expressed in several skeletal muscles of three passeriform birds, the golden-collared manakin (Manacus vitellinus), zebra finch (Taenopygia guttata), and ochre-bellied flycatcher (Mionectes oleagieus). Because skeletal muscles that control wing movement make up the bulk of a bird's body mass, evidence for widespread effects of androgen action on these muscles would greatly expand the functional impact of androgens beyond their well-characterized effects on relatively discrete targets throughout the avian body. To investigate this issue, we use quantitative PCR (qPCR) to determine if androgens alter gene mRNA expression patterns in wing musculature of wild golden-collared manakins and captive zebra finches. In manakins, the androgen testosterone (T) up-regulated expression of parvalbumin (PV) and insulin-like growth factor I (IGF-I), two genes whose products enhance cellular Ca(2+) cycling and hypertrophy of skeletal muscle fibers. In T-treated zebra finches, the anti-androgen flutamide blunted PV and IGF-I expression. These results suggest that certain transcriptional effects of androgen action via AR are conserved in passerine skeletal muscle tissue. When we examined wing muscles of manakins, zebra finches and ochre-bellied flycatchers, we found that expression of PV and IGF-I varied across species and in a manner consistent with a function for AR-dependent gene regulation. Together, these findings imply that androgens have the potential to act on avian muscle in a way that may enhance the physicality required for successful reproduction." @default.
- W2107370564 created "2016-06-24" @default.
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- W2107370564 date "2012-12-17" @default.
- W2107370564 modified "2023-10-01" @default.
- W2107370564 title "Androgens Regulate Gene Expression in Avian Skeletal Muscles" @default.
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- W2107370564 doi "https://doi.org/10.1371/journal.pone.0051482" @default.
- W2107370564 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3524251" @default.
- W2107370564 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23284699" @default.
- W2107370564 hasPublicationYear "2012" @default.
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