Photoperiod-dependent changes in TSH-like immunoreactivity of cells in the hypophysial pars tuberalis of the Djungarian hamster, Phodopus sungorus

Wittkowski, W.; Bergmann, Martin; Hoffmann, K.; Pera, Franz

doi:10.1007/bf00215463

Cited by 101 publications

(66 citation statements)

References 17 publications

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“…It has been reported that the expression of CGA and TSHb in the mammalian pars tuberalis are photoperiodically regulated (Wittkowski et al 1988, Bockmann et al 1996, 1997. Furthermore, the expression of TSH has been detected in the CSF and CNS (Schaub et al 1977, Hojvat et al 1982 of mammals.…”

Section: Resultsmentioning

confidence: 99%

Thyroid hormones and seasonal reproductive neuroendocrine interactions

Nakao¹,

Ono²,

Yoshimura³

2008

Reproduction

101

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Many animals that breed seasonally measure the day length (photoperiod) and use these measurements as predictive information to prepare themselves for annual breeding. For several decades, thyroid hormones have been known to be involved in this biological process; however, their precise roles remain unknown. Recent molecular analyses have revealed that local thyroid hormone activation in the hypothalamus plays a critical role in the regulation of the neuroendocrine axis involved in seasonal reproduction in both birds and mammals. Furthermore, functional genomics analyses have revealed a novel function of the hormone thyrotropin. This hormone plays a key role in signaling day-length changes to the brain and thus triggers seasonal breeding. This review aims to summarize the currently available knowledge on the interactions between elements of the thyroid hormone axis and the neuroendocrine system involved in seasonal reproduction.

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Section: Resultsmentioning

confidence: 99%

Thyroid hormones and seasonal reproductive neuroendocrine interactions

Nakao¹,

Ono²,

Yoshimura³

2008

Reproduction

101

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“…Therefore, although they express the same hormones, TSH-immunoreactive cells in the PT and in the PD are not physiologically regulated in the same way. Wittkowski et al (1988) have shown that the TSH content of PT-specific cells is strongly reduced in Djungarian hamsters subjected to short days compared to long days. Because this effect is prevented by pinealectomy and can be mimicked by injections of melatonin, it appears that melatonin is a major regulator of TSH expression in the PT (Böckers et al 1995; Bockmann et al 1996).…”

Section: Discussionmentioning

confidence: 96%

The mt1 Melatonin Receptor and RORβ Receptor Are Co-localized in Specific TSH-immunoreactive Cells in the Pars Tuberalis of the Rat Pituitary

Klosen

Bienvenu

Demarteau

et al. 2002

J Histochem Cytochem.

115

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S U M M A R YThe pars tuberalis (PT) of the pituitary represents an important target site for the time-pacing pineal hormone melatonin because it expresses a large number of mt1 receptors. Functional studies suggest that the PT mediates the seasonal effects of melatonin on prolactin (PRL) secretion. The aim of this study was the characterization of the phenotype of melatonin-responsive cells. Furthermore, we determined whether ROR ␤ , a retinoid orphan receptor present in the PT, was co-expressed in the same cells. We combined nonradioactive in situ hybridization (ISH) with hapten-labeled riboprobes for detection of the receptors and immunocytochemistry (ICC) for detection of ␣ GSU ( ␣ -glycoprotein subunit), ␤ TSH, ␤ FSH, ␤ LH, GH, PRL, and ACTH. Expression of mt1 mRNA was found in small round cells, co-localized with ␣ GSU and ␤ TSH. However, not all ␤ TSH-containing cells expressed mt1 mRNA. The distribution of mt1-and ROR ␤ -positive cells appeared to overlap, although more cells were labeled for ROR ␤ than for mt1. Gonadotrophs, as well as other pars distalis cell types, were never labeled for mt1 melatonin receptor. Therefore, this study identifies the "specific" cells of the PT as the mt1 melatonin receptor-expressing cells.(

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“…Poult. Sci., 10 (1): 52-63, 2016 stimulate and release of thyroid hormones (Wittkowski et al, 1988). Thyroid hormones especially T 3 have a multiple effects on vertebrate metabolism and development.…”

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confidence: 99%

Effect of Artificial and Natural Day Light Intensities on some Behavioral Activities, Plumage Conditions, Productive and Physiological Changes for Japanese Quail

Khalil¹,

Hanafy²,

Hamdy³

2015

Asian J. of Poultry Science

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This study was designed to evaluate the effects of different artificial light intensity; 10, 50, 250, 500 lux and natural day light (NDL, average 375 lux) from 3-18 week of age on behavioral activities, plumage conditions, productive and physiological traits for grower and layer of Japanese quail. A total of 270 Japanese quails chicks (3 week old) were randomly assigned to five treatment groups according to different light intensities. The results showed that the birds subjected at NDL and 250 lux spent significantly more time standing than those recorded in 50 and 500 lux groups. Also, birds kept at 500 lux spent significantly more time walking compared with other groups. The lowest plumage deterioration was detected in birds kept under NDL compared with other experimental groups. The heavier body weight (p#0.05) at 6 weeks and weight gain from 3-6 weeks were detected for birds reared at NDL and 250 lux compared with 500 lux and did not significant with the rest of the experimental groups. While, Hen Day Egg Production (HDEP) and Total Egg Mass (TEM) were linearly increased beginning of 50 lux with increasing light intensity. Fertility percentage was significantly higher in 250 lux group than in 50 lux and was not significant with the other groups. Hatchability percentage was significantly decreased in 10 lux group compared with the other groups. Serum level of T 3 was decreased linearly with increasing light intensity. Birds kept at 500 lux had reduced overall number of Ovarian Yellow Follicle (OYF), relative weight of ovaries and testes and cloacal gland area compared with the other groups. From our results, it could be concluded that neither high light intensity (500 lux) nor low light intensity (10 lux) had a positive effect on most traits. Therefore, to maximize productive, reproductive parameters and increase revenue economic may be by using moderate artificial light intensity if we used closed-side housing system or NDL if we used open side housing system for production of Japanese quail.

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Photoperiod-dependent changes in TSH-like immunoreactivity of cells in the hypophysial pars tuberalis of the Djungarian hamster, Phodopus sungorus

Cited by 101 publications

References 17 publications

Thyroid hormones and seasonal reproductive neuroendocrine interactions

Thyroid hormones and seasonal reproductive neuroendocrine interactions

The mt1 Melatonin Receptor and RORβ Receptor Are Co-localized in Specific TSH-immunoreactive Cells in the Pars Tuberalis of the Rat Pituitary

Effect of Artificial and Natural Day Light Intensities on some Behavioral Activities, Plumage Conditions, Productive and Physiological Changes for Japanese Quail

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