The Role of Gonadal Hormones in Gene Expression of Calbindin (Mr28,000) in the Laying Hen

Bär, A.; Vax, E.; Hunziker, Willi; Halevy, Orna; Striem, S.

doi:10.1006/gcen.1996.0100

Cited by 31 publications

(17 citation statements)

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“…High plasma corticosterone concentrations play a critical role in eggshell formation depending on the time of egg laying ( Klingensmith et al, 1984 ). Indeed, dexamethasone, a synthetic glucocorticoid, has been shown to prolong the period of egg formation and to reduce the expression of calbindin mRNA in the eggshell gland and the intestine ( Bar et al, 1996 ) and c-myc mRNA in the oviduct ( Rories et al, 1989 ). Expression of calbindin occurs after that of osteopontin, both of which plays a role in calcification, and soft shells are accompanied by reduced expression in calbindin, but not in osteopontin ( Lavelin et al, 1998 ).…”

Section: Discussionmentioning

confidence: 99%

Effects of Dietary Corticosterone on Yolk Colors and Eggshell Quality in Laying Hens

Kim

Yoon

et al. 2015

Asian Australas. J. Anim. Sci

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The objective of this study was to investigate the effects of dietary corticosterone on egg quality. For 2 weeks hens received either control or experimental diet containing corticosterone at 30 mg/kg diet. Feed intake and egg production were monitored daily, and body weight measured weekly. Egg weights and egg quality were measured daily. Corticosterone treatment resulted in a remarkable increase in feed intake and sharp decrease in egg production compared with control (p<0.05) whereas body weight remained unchanged. Decreased albumen height, but no changes in egg weight, led to decreased Haugh unit (p<0.05). Corticosterone caused elevated eggshell thickness (p<0.05) without altering weight and strength, suggesting possible changes in shell structure. Yolk color and redness were increased by corticosterone (p<0.05) but lightness and yellowness were either not changed or inconsistent over the time period of measurements. Increased concentrations in plasma were also found for corticosterone, glucose, cholesterol, creatinine, uric acid, albumin, aspartate aminotransferase, creatine kinase, lactate dehydrogenase, total protein, and amylase (p<0.05), suggesting that corticosterone increased protein breakdown, renal dysfunctions and pancreatitis. Together, the current results imply that dietary corticosterone affects egg quality such as yolk colors and shell thickness, in addition to its effects on feed intake and egg production.

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Section: Discussionmentioning

confidence: 99%

Effects of Dietary Corticosterone on Yolk Colors and Eggshell Quality in Laying Hens

Kim

Yoon

et al. 2015

Asian Australas. J. Anim. Sci

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“…Hepatic production of vitellogenin is primarily an estrogenic process (Capony and Williams 1981); however, the production of albumen proteins in the oviduct can also be secondarily stimulated by receptor-mediated binding of progesterones, androgens, and glucocorticosteroids in addition to estrogens (McKnight and Palmiter 1979), and the mechanisms of these hormones are unaffected (and in some cases are potentiated) by tamoxifen treatment (Catelli et al 1980;Lebouc et al 1985). Calcification of the egg shell is also not a singularly estrogenic process (Qin and Klandorf 1995), and tamoxifen does not appear to affect activity or concentration of the calcium-binding protein (calbindin) in the avian intestine or eggshell gland in laying hens (Bar et al 1996). The specific effect of tamoxifen on egg size via the process of yolk formation is also confirmed by Williams's (2000) observation that tamoxifen treatment reduced relative yolk mass and yolk protein content but did not alter the relative proportion of yolk lipid, albumen, or shell.…”

Section: Discussionmentioning

confidence: 99%

Experimental (Antiestrogen‐Mediated) Reduction in Egg Size Negatively Affects Offspring Growth and Survival

Wagner

Williams

2007

Physiological and Biochemical Zoology

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The relationship between egg size and offspring phenotype is critical to our understanding of the selective pressures acting on the key reproductive life-history traits of egg size and number. Yet there is surprisingly little empirical evidence to support a strong, positive relationship between egg size and offspring quality (i.e., offspring growth, condition, and survival) in birds, in part because of confounding effects of parental quality and the lack of experimental techniques for directly manipulating avian egg size independently of maternal condition. Previously, we showed that treatment of laying female zebra finches (Taeniopygia guttata) with the antiestrogen tamoxifen can decrease egg size by ca. 8% but that this reduction in egg size had few effects on offspring mass and size at fledging. Here, we extend the use of this technique to induce larger decreases in egg size (up to 50% in individual females) and show that a reduction in egg size of ca. 18% is associated with decreased embryo viability, increased hatchling mortality, and lower posthatching offspring survival. Furthermore, we show that although hatchlings from eggs reduced in size by ca. 9% can survive to fledging, these chicks show slower initial growth during the linear growth phase (5-10 d of age), fledge at lower masses than chicks from control eggs, and show postfledging compensatory growth. Our results provide empirical support for significant effects of egg size on offspring quality and further suggest that among individual females there is a minimum egg size required to maintain embryo viability and offspring quality.

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“…Only one steroid hormone was delivered per experiment. Hormone doses were based on previous studies in which steroid levels were experimentally manipulated to achieve short-term changes in circulating plasma levels of cortisol (Veillette et al, 1995;Remage-Healey and Romero, 2001;Wood et al, 2001), 11KT (Townsend et al, 1991;Bar et al, 1996;Watanuki et al, 2002), 17␤-estradiol (Salbert et al, 1993;Olsson and Kling, 1995), and testosterone (Townsend et al, 1991;Joubert and Tobin, 1995;Bar et al, 1996;McAllan et al, 1998). After hormone or vehicle injection, a subsequent series of vocal motor recordings were obtained at 5,15,30,45,60,90, and 120 min.…”

Section: Methodsmentioning

confidence: 99%

Rapid, Hierarchical Modulation of Vocal Patterning by Steroid Hormones

Remage‐Healey¹,

Bass²

2004

J. Neurosci.

159

140

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Vocal control systems have been identified in all major groups of jawed vertebrates. Although steroid hormones are instrumental in the long-term development and maintenance of neural structures underlying vocalization, it is unknown whether steroids rapidly modulate the neural activity of vocal motor systems. The midshipman fish generates advertisement and agonistic calls that mainly differ in duration. A descending midbrain pathway activates a hindbrain-spinal vocal circuit that directly establishes the discharge frequency and duration of the rhythmic vocal motor volley. This vocal motor output, which can be monitored from occipital nerve roots, directly determines the rate and duration of contraction of a pair of sonic muscles and, in turn, the fundamental frequency and duration of vocalizations. Here, we demonstrate that the duration of the vocal motor volley, or fictive vocalization, is rapidly responsive to steroid hormones, including androgens, estrogens, and glucocorticoids. These responses are consistent, in part, with a nongenomic mechanism and are steroid specific at the receptor level, suggesting the possibility of multiple membrane-bound receptor populations. We also show, using intact and semi-intact preparations, that steroids hierarchically modulate fictive vocalizations; whereas the hindbrain-spinal region is both necessary and sufficient for rapid (within 5 min) effects on duration, descending midbrain input is necessary for maintenance (up to 120 min) of these effects. The conserved nature of vertebrate vocal motor systems suggests that the neuroendocrine principles outlined in this study may be a fundamental feature of all vocal vertebrates.

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The Role of Gonadal Hormones in Gene Expression of Calbindin (Mr28,000) in the Laying Hen

Cited by 31 publications

References 0 publications

Effects of Dietary Corticosterone on Yolk Colors and Eggshell Quality in Laying Hens

Effects of Dietary Corticosterone on Yolk Colors and Eggshell Quality in Laying Hens

Experimental (Antiestrogen‐Mediated) Reduction in Egg Size Negatively Affects Offspring Growth and Survival

Rapid, Hierarchical Modulation of Vocal Patterning by Steroid Hormones

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