Article (Scientific journals)
Androgen signaling in LMAN regulates song stereotypy in male canaries.
Alward, Beau A; Balthazart, Jacques; Ball, Gregory F
2024In Hormones and Behavior, 165, p. 105611
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Keywords :
Testosterone; flutamide; lateral magnocellular nucleus of the anterior nidopallium; song variability, Serinus canaria; Androgens; Receptors, Androgen; Flutamide; Androgen Antagonists; Animals; Male; Stereotyped Behavior/drug effects; Stereotyped Behavior/physiology; Receptors, Androgen/metabolism; Receptors, Androgen/physiology; Flutamide/pharmacology; Photoperiod; Seasons; Signal Transduction/physiology; Signal Transduction/drug effects; Testosterone/metabolism; Testosterone/pharmacology; Androgen Antagonists/pharmacology; Vocalization, Animal/physiology; Vocalization, Animal/drug effects; Canaries/physiology; Androgens/pharmacology
Abstract :
[en] During breeding when testosterone concentrations are high, male songbirds that are open-ended vocal learners like canaries (Serinus canaria) tend to produce a stable, stereotyped song that facilitates mate attraction or territory defense. Outside breeding contexts, song becomes more variable. The neuroendocrine mechanisms controlling this vocal variability across seasons are not entirely clear. We tested whether androgen signaling within the lateral magnocellular nucleus of the anterior nidopallium (LMAN), a cortical-like brain region of the vocal control system known as a vocal variability generator, plays a role in seasonal vocal variability. We first characterized song in birds housed alone on a short day (SD) photoperiod, which simulates non-breeding conditions. Then, cannulae filled with the androgen receptor (AR) blocker flutamide or left empty as control were implanted bilaterally in LMAN. Birds were then transferred to long days (LD) to simulate the breeding season and song was analyzed again. Blocking AR in LMAN increased acoustic variability of song and the acoustic variability of syllables. However, blocking AR in LMAN did not impact the variability of syllable usage nor their sequencing in LD birds, song features that are controlled by androgen signaling in a somatosensory brain region of the vocal control system called HVC. These findings highlight the multifactorial, non-redundant actions of steroid hormones in controlling complex social behaviors such as birdsong. They also support the hypothesis that LMAN is a key brain area for the effects of testosterone on song plasticity both seasonally in adults and during the song crystallization process at sexual maturity.
Disciplines :
Zoology
Neurology
Author, co-author :
Alward, Beau A;  Department of Psychology, T.I.M.E.S, University of Houston, Houston, TX 77204, USA, Department of Biology and Biochemistry, University of Houston, Houston, TX 77004, USA, Department of Psychology, Neural and Cognitive Science Program, University of Maryland, College Park, MD 20742, USA
Balthazart, Jacques  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques
Ball, Gregory F;  Department of Psychology, Neural and Cognitive Science Program, University of Maryland, College Park, MD 20742, USA
Language :
English
Title :
Androgen signaling in LMAN regulates song stereotypy in male canaries.
Publication date :
September 2024
Journal title :
Hormones and Behavior
ISSN :
0018-506X
eISSN :
1095-6867
Publisher :
Elsevier, United States
Volume :
165
Pages :
105611
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
NINDS - National Institute of Neurological Disorders and Stroke
Funding text :
This work was supported by a grant from the National Institute of Neurological Disorders and Stroke Grant RO1NS104008 (to G.F.B. and J.B.). We thank Farrah Madison for logistical support on stereotaxic surgeries and song analysis and Tara Tronetti for assistance on song analysis.
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