Abstract:
:The present study examined plasma concentrations of insulin-like growth factor (IGF)-I, IGF-II and IGF-binding proteins (IGFBPs) during posthatch growth and development in chickens. Three distinct proteins which bound 125I-IGF-I were observed irrespective of age or sex, these having apparent molecular weights of 22, 28, and 36 kDa. The major IGFBP present during much of the growth and development period was the 28-kDa form followed by the 36-kDa form. Plasma concentrations of IGF-II and of the 22-kDa IGFBP showed little ontogenic variation with the exception of elevated levels of the 22 kDa IGFBP in 1-day-old chicks. The circulating concentrations of IGF-I and of the 28-kDa IGFBP increased progressively between the time of hatching to reach a maximum at 6 weeks of age and subsequently declined to lower levels in adults. Somewhat similarly, the 36-kDa IGFBP increased during early pre- and posthatching growth to a maximum at 6 weeks of age. There were marked sex differences in circulating concentrations of IGF-I in young (4 week) and adult chickens and in the 36-kDa IGFBP in the adult, both being lower in females. Estrogen treatment of adult male chickens decreased the circulating concentrations of IGF-I together with the level of both the 28- and 36-kDa IGFBPs. Testosterone treatment had no effect on the circulating concentrations of either IGF-I or IGFBPs in adult female chickens. We conclude that the relative levels of IGF-I, IGF-II, and the IGFBPs change with age. In addition, circulating concentrations of estrogen may play a role in the regulation of IGF-I and IGFBPs.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Radecki SV,Capdevielle MC,Buonomo FC,Scanes CGdoi
10.1006/gcen.1997.6898subject
Has Abstractpub_date
1997-07-01 00:00:00pages
109-17issue
1eissn
0016-6480issn
1095-6840pii
S0016-6480(97)96898-2journal_volume
107pub_type
杂志文章abstract::Hyperglycemia that is caused by the release of crustacean hyperglycemic hormone (CHH) from the sinus gland to hemolymph is one of the hallmark physiological phenomena, occurring in decapod crustaceans experiencing stressful conditions. However, the mechanism(s) by which such elevated glucose levels return to resting l...
journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2019.02.004
更新日期:2019-05-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(84)90112-6
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2006.04.007
更新日期:2006-09-15 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.1995.1049
更新日期:1995-04-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/j.ygcen.2004.03.007
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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abstract::The zebrafish is a powerful genetic model organism. In recent years, zebrafish has been increasingly used to model human diseases. Due to a number of recent technological advancements, the genetic tool box is now also stocked with sophisticated transgenic and reverse genetic tools. Here, we focus on both commonly used...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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abstract::The cell types within the endocrine pancreatic tissue and anterior intestine of larvae and juveniles of representatives of the two southern-hemisphere families (Mordaciidae and Geotriidae) were compared, using immunohistochemistry and antisera against insulin (lamprey, bovine), two somatostatins (SST-14, -34), two PP-...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
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