Distribution and sequence of gonadotropin-inhibitory hormone and its potential role as a molecular link between feeding and reproductive systems in the Pekin duck (Anas platyrhynchos domestica)

Fraley, Gregory S.; Coombs, Erika; Gerometta, Elizabeth; Colton, Sarah; Sharp, P. J.; Li, Qun; Clarke, I. J.

doi:10.1016/j.ygcen.2012.11.026

Cited by 50 publications

(38 citation statements)

References 48 publications

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“…It was also demonstrated that GnIH receptor mRNA or protein is expressed in GnRH neurons in birds and mammals (Ubuka et al, 2012a) (Figure 1). Central administration of GnIH inhibited the release of gonadotropin in white-crowned sparrows , Pekin duck (Fraley et al, 2013), Syrian hamsters (Kriegsfeld et al, 2006), Siberian hamsters (Ubuka et al, 2012a) and rats (Johnson et al, 2007;Pineda et al, 2010a) in a manner similar to peripheral administration of GnIH (Osugi et al, 2004;Kriegsfeld et al, 2006;Ubuka et al, 2006) (Table 1). Accordingly, GnIH may inhibit the secretion of gonadotropins by decreasing the activity of GnRH neurons in addition to directly regulating pituitary gonadotropin secretion.…”

Section: Regulation Of Gonadotropin Synthesis and Releasementioning

confidence: 86%

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Molecular, cellular, morphological, physiological and behavioral aspects of gonadotropin-inhibitory hormone

Ubuka

Son

Tsutsui

2016

General and Comparative Endocrinology

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Section: Regulation Of Gonadotropin Synthesis and Releasementioning

confidence: 86%

“…On the other hand, anti-GnIH antiserum suppressed appetite induced by fasting, but did not modify feeding under ad libitum conditions (Tachibana et al, 2005). Fraley et al (2013) have shown that i.c.v. injection of GnIH, but not of GnIH-RP1, depresses plasma LH and stimulates feeding in adult Pekin drakes (Table 1).…”

Section: Stimulation Of Feeding Behaviormentioning

confidence: 99%

Molecular, cellular, morphological, physiological and behavioral aspects of gonadotropin-inhibitory hormone

Ubuka

Son

Tsutsui

2016

General and Comparative Endocrinology

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“…This radioimmunoassay has been used extensively to quantify plasma LH in a wide range of avian species (e.g., Fraley et al, 2013;Schaper et al, 2012a), including many emberizid sparrows (Deviche et al, 2012a(Deviche et al, , 2012bMeddle et al, 2002;Wingfield et al, 2012). Briefly, 20 ll of plasma sample or standard was mixed with 20 ll of primary rabbit LH antibody and 20 ll of I 125 -labeled LH for a total reaction volume of 60 ll.…”

Section: Hormone Assaysmentioning

confidence: 99%

Advanced seasonal reproductive development in a male urban bird is reflected in earlier plasma luteinizing hormone rise but not energetic status

Davies

Behbahaninia

Giraudeau

et al. 2015

General and Comparative Endocrinology

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Urban animals inhabit an environment considerably different than do their non-urban conspecifics, and to persist urban animals must adjust to these novel environments. The timing of seasonal reproductive development (i.e., growth of gonads and secondary sex organs) is a fundamental determinant of the breeding period and is frequently advanced in urban bird populations. However, the underlying mechanism(s) by which birds adjust the timing of reproductive development to urban areas remain(s) largely unknown. Here, we compared the timing of vernal reproductive development in free-ranging urban and non-urban male Abert's Towhees, Melozone aberti, in Phoenix, Arizona, USA, and tested the non-mutually exclusive hypotheses that earlier reproductive development is due to improved energetic status and/or earlier increase in endocrine activity of the reproductive system. We found that urban birds initiated testicular development earlier than non-urban birds, but this disparity was not associated with differences in body condition, fat stores, or innate immune performance. These results provide no support for the hypothesis that energetic constraints are responsible for delayed reproductive development of non-urban relative to urban male Abert's Towhees. Urban birds did, however, increase their plasma luteinizing hormone, but not plasma testosterone, earlier than non-urban birds. These findings suggest that adjustment to urban areas by Abert's Towhees involves increases in the endocrine activity of the anterior pituitary gland and/or hypothalamus earlier than non-urban towhees.

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“…Gonadotropin-inhibitory hormone (GnIH) (Tsutsui et al, 2000), which inhibits both LH release from the pituitary gland and GnRH cells directly (for reviews, see Clarke, 2011;Kriegsfeld et al, 2015;Tsutsui, 2009;Tsutsui et al, 2010Tsutsui et al, , 2012, is one potential candidate in this mediation. Short-term energy deprivation stimulates GnIH activity in the Pekin duck, Anas platyrhynchos domestica (Fraley et al, 2013), and GnIH can stimulate food intake in birds and mammals (for reviews, see Clarke et al, 2012;Kriegsfeld et al, 2015;Tsutsui, 2009;Tsutsui et al, 2010Tsutsui et al, , 2012. Neuropeptide Y (NPY) is another neuropeptide that may be involved in transducing metabolic information to GnRH cells.…”

Section: Introductionmentioning

confidence: 99%

Food restriction negatively affects multiple levels of the reproductive axis in male house finches, Haemorhous mexicanus

Valle

Carpentier

et al. 2015

Journal of Experimental Biology

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Nutrition influences reproductive functions across vertebrates, but the effects of food availability on the functioning of the hypothalamicpituitary-gonadal (HPG) axis in wild birds and the mechanisms mediating these effects remain unclear. We investigated the influence of chronic food restriction on the HPG axis of photostimulated house finches, Haemorhous mexicanus. Food-restricted birds had underdeveloped testes with smaller seminiferous tubules than ad libitum-fed birds. Baseline plasma testosterone increased in response to photostimulation in ad libitum-fed but not in food-restricted birds. Food availability did not, however, affect the plasma testosterone increase resulting from a gonadotropin-releasing hormone-I (GnRH) or a luteinizing hormone (LH) challenge. The number of hypothalamic GnRH immunoreactive (ir) but not proGnRH-ir perikarya was higher in food-restricted than in ad libitum-fed finches, suggesting inhibited secretion of GnRH. Hypothalamic gonadotropin-inhibitory hormone (GnIH)-ir and neuropeptide Y (NPY)-ir were not affected by food availability. Plasma corticosterone (CORT) was also not affected by food availability, indicating that the observed HPG axis inhibition did not result from increased activity of the hypothalamic-pituitaryadrenal (HPA) axis. This study is among the first to examine multilevel functional changes in the HPG axis in response to food restriction in a wild bird. The results indicate that food availability affects both hypothalamic and gonadal function, but further investigations are needed to clarify the mechanisms by which nutritional signals mediate these effects.

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Distribution and sequence of gonadotropin-inhibitory hormone and its potential role as a molecular link between feeding and reproductive systems in the Pekin duck (Anas platyrhynchos domestica)

Cited by 50 publications

References 48 publications

Molecular, cellular, morphological, physiological and behavioral aspects of gonadotropin-inhibitory hormone

Molecular, cellular, morphological, physiological and behavioral aspects of gonadotropin-inhibitory hormone

Advanced seasonal reproductive development in a male urban bird is reflected in earlier plasma luteinizing hormone rise but not energetic status

Food restriction negatively affects multiple levels of the reproductive axis in male house finches, Haemorhous mexicanus

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