Effects of Starvation on Gonadotropin and Thyrotropin Subunit mRNA Levels and Plasma Hormone Levels in the Male Japanese Quail (Coturnix coturnix japonica)

Kobayashi, Masaki; Ishii, Susumu

doi:10.2108/zsj.19.331

Cited by 19 publications

(16 citation statements)

References 36 publications

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“…Thus, the lower RMR in the food-restricted birds in our present study could be mediated by changes in plasma thyroid levels, especially T3 as this is considered the most functionally active form (Decuypere et al, 2005). As in previous studies of Japanese quails, we found that plasma T3 levels decreased as a response to food restriction (Schew et al, 1996;Kobayashi and Ishii, 2002), indicating that plasma T3 was involved in slowing metabolic rate in food-restricted birds. In the ad libitum fed birds there was no correlation between plasma T3 concentration and RMR.…”

Section: Metabolismsupporting

confidence: 82%

“…Whereas the mRNA levels of IGF-I, which is important for normal growth and development, decrease in the liver as a response to food restriction (Beccavin et al, 2001; Kita et al, 2005). Additionally, food restriction has been observed to potentially influence thyroid hormone release through reduction in thyroid-stimulating hormone β (TSHβ) mRNA expression in the pituitary gland (Kobayashi and Ishii, 2002). Thus, nutritional effects on growth and metabolism appear to be partly regulated through changes in mRNA expression of important endocrine factors.…”

Section: Introductionmentioning

confidence: 99%

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Food restriction in young Japanese quails: effects on growth, metabolism,plasma thyroid hormones and mRNA species in the thyroid hormone signalling pathway

Rønning

Mortensen

Moe

et al. 2009

Journal of Experimental Biology

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SUMMARYYoung birds, in their post-natal growth period, may reduce their growth and metabolism when facing a food shortage. To examine how such responses can be mediated by endocrine-related factors, we exposed Japanese quail chicks to food restriction for either 2 days (age 6-8 days) or 5 days (age 6-11 days). We then measured growth and resting metabolic rate (RMR), and circulating 3,3Ј,5-triiodo-L-thyronine (T3) and 3,5,3Ј,5Ј-tetraiodothyronine (T4) levels as well as expression patterns of genes involved in growth (insulin-like growth factor-I: IGF-I) and thyroid hormone signalling (thyroid-stimulating hormone-β: TSHβ, type II iodothyronine deiodinase: D2, thyroid hormone receptors isoforms: TRα and TRβ). The food-restricted chicks receiving a weight-maintenance diet showed reductions in structural growth and RMR. Plasma levels of both T3 and T4 were reduced in the food-restricted birds, and within the 5 days food-restricted group there was a positive correlation between RMR and T3. IGF-I mRNA showed significantly higher abundance in the liver of ad libitum fed birds at day 8 compared with food-restricted birds. In the brain, TSHβ mRNA level tended to be lower in food-restricted quails on day 8 compared with controls. Furthermore, TRα expression was lower in the brain of food-restricted birds at day 8 compared with birds fed ad libitum. Interestingly, brain D2 mRNA was negatively correlated with plasma T3 levels, tending to increase with the length of food restriction. Overall, our results show that food restriction produced significant effects on circulating thyroid hormones and differentially affected mRNA species in the thyroid hormone signalling pathway. Thus, we conclude that the effects of food restriction observed on growth and metabolism were partly mediated by changes in the endocrine-related factors investigated.

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Section: Metabolismsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Food restriction in young Japanese quails: effects on growth, metabolism,plasma thyroid hormones and mRNA species in the thyroid hormone signalling pathway

Rønning

Mortensen

Moe

et al. 2009

Journal of Experimental Biology

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“…Contents of gonadotropin and thyrotropin subunit and β-actin mRNAs were measured by Northern blotting as described by Kobayashi and Ishii (2002). Briefly, total RNA samples were electrophoresed and then transferred to nylon membranes (NYTRAN, Schleicher & Schell, Postfach, Germany).…”

Section: Northern Blottingmentioning

confidence: 99%

“…Some investigators have studied changes in intra-pituitary contents of mRNAs for the subunit precursor molecules in the rat (Bergendahl et al ., 1989(Bergendahl et al ., , 1991Bergendahl and Huhtaniemi, 1993), sheep (Thomas et al ., 1990) and Japanese quail (Kobayashi and Ishii, 2002). From these results, these investigators suggested that starvation affects reproductive activity by not only stopping the secretion of the gonadotropins but also by suppressing the transcription of the hormone subunit precursor genes.…”

Section: Introductionmentioning

confidence: 97%

“…Significant differences between the experimental and control groups on the same day are indicated at P<0.05 (*) and P<0.01 (**). reported to be influenced by starvation in birds (May, 1978;Klandorf and Harvey, 1985;Hoshino et al ., 1988;Geris et al ., 1999;Van der Geyten et al ., 1999;Kobayashi and Ishii, 2002). We reported that starvation decreased the content of mRNA encoding the thyroid stimulating hormone (TSH) β -subunit precursor molecule in the Japanese quail (Kobayashi and Ishii, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Starvation and Refeeding on Gonadotropin and Thyrotropin Subunit mRNAs in Male Japanese Quail

Kobayashi

Cockrem²,

Ishii

2002

Zoological Science

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Seasonality in tropical birds

et al. 2022

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The survival of offspring depends on environmental conditions. Many organisms have evolved with seasonality, characterized as initiation‐termination‐reinitiation of several physiological processes (i.e., body fattening, molt, plumage coloration, reproduction, etc). It is an adaptation for the survival of many species. Predominantly seasonal breeders use photoperiod as the most reliable environmental cue to adapt to seasonal changes but supplementary factors like temperature and food are synergistically involved in seasonal processes. Studies from diverse vertebrate systems have contributed to understanding the mechanism involved in seasonal reproduction at the molecular and endocrine levels. Long‐day induced thyrotropin (thyroid‐stimulating hormone) released from the pars tuberalis of the pituitary gland triggers local thyroid hormone activation within the mediobasal hypothalamus. This locally produced thyroid hormone, T3, regulates seasonal gonadotropin‐releasing hormone secretion. Most of the bird species studied are seasonal in reproduction and linked behavior and, therefore, need to adjust reproductive decisions to environmental fluctuations. Reproductive strategies of the temperate zone breeders are well‐documented, but less is known about tropical birds' reproduction and factors stimulating the annual breeding strategies. Here, we address seasonality in tropical birds with reference to seasonal reproduction and the various environmental factors influencing seasonal breeding.

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Effects of Starvation on Gonadotropin and Thyrotropin Subunit mRNA Levels and Plasma Hormone Levels in the Male Japanese Quail (Coturnix coturnix japonica)

Cited by 19 publications

References 36 publications

Food restriction in young Japanese quails: effects on growth, metabolism,plasma thyroid hormones and mRNA species in the thyroid hormone signalling pathway

Food restriction in young Japanese quails: effects on growth, metabolism,plasma thyroid hormones and mRNA species in the thyroid hormone signalling pathway

Effects of Starvation and Refeeding on Gonadotropin and Thyrotropin Subunit mRNAs in Male Japanese Quail

Seasonality in tropical birds

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