PMID: 6547104Apr 1, 1984

Involvement of 1,25-dihydroxycholecalciferol in the short- and long-term increase of intestinal calcium absorption in laying hens: stimulation by gonadal hormones is partly independent of 1,25-dihydroxycholecalciferol

General and Comparative Endocrinology
Y NysM Garabedian


The short- and long-term effects of 1,25-dihydroxycholecalciferol (1,25(OH)2D3) and its interactions with sexual steroids on Ca absorption were studied in hens. A single injection of 375 ng 1,25(OH)2D3 did not increase intestinal calcium transport in D-repleted hens within 24 hr of administration. However, five daily injections of 1 alpha-(OH)D3(0.5 micrograms/kg), a low Ca intake, or oestrogen-testosterone (O.T) did increase calcium absorption in D-repleted immature pullets (measured by in vivo perfusion), mainly by increasing the diffusional component of Ca transport. O.T. further increased the stimulation by 1 alpha-(OH)D3 of calcium absorption and of duodenal CaBP concentration. At higher doses the stimulation by 1 alpha-(OH)D3 of calcium transport estimated by in situ ligated loop procedure was dose dependent and was not saturable at daily doses of less than 3 micrograms/kg. When Ca transport was stimulated by 2 micrograms/kg of 1 alpha-(OH)D3, an additional effect of O.T. was observed again without any increase in plasma levels of 1,25(OH)2D3. Both oestrogen and testosterone were necessary for this effect on Ca transport. This is evidence for an indirect effect on Ca transport, as both steroids are also necessary to induc...Continue Reading


Jan 3, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Arie Bar

Related Concepts

Cytoplasmic Matrix
Estradiol, (16 alpha,17 beta)-Isomer
Intestinal Absorption
Calcium-Binding Protein, Vitamin D-Dependent

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Alzheimer's Disease: MS4A

Variants within the membrane-spanning 4-domains subfamily A (MS4A) gene cluster have recently been implicated in Alzheimer's disease in genome-wide association studies. Here is the latest research on Alzheimer's disease and MS4A.

Pediculosis pubis

Pediculosis pubis is a disease caused by a parasitic insect known as Pthirus pubis, which infests human pubic hair, as well as other areas with hair including eye lashes. Here is the latest research.

Rh Isoimmunization

Rh isoimmunization is a potentially preventable condition that occasionally is associated with significant perinatal morbidity or mortality. Discover the latest research on Rh Isoimmunization here.

Genetic Screens in iPSC-derived Brain Cells

Genetic screening is a critical tool that can be employed to define and understand gene function and interaction. This feed focuses on genetic screens conducted using induced pluripotent stem cell (iPSC)-derived brain cells. It also follows CRISPR-Cas9 approaches to generating genetic mutants as a means of understanding the effect of genetics on phenotype.

Enzyme Evolution

This feed focuses on molecular models of enzyme evolution and new approaches (such as adaptive laboratory evolution) to metabolic engineering of microorganisms. Here is the latest research.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Pharmacology of Proteinopathies

This feed focuses on the pharmacology of proteinopathies - diseases in which proteins abnormally aggregate (i.e. Alzheimer’s, Parkinson’s, etc.). Discover the latest research in this field with this feed.

Alignment-free Sequence Analysis Tools

Alignment-free sequence analyses have been applied to problems ranging from whole-genome phylogeny to the classification of protein families, identification of horizontally transferred genes, and detection of recombined sequences. Here is the latest research.

Related Papers

Comparative Biochemistry and Physiology. A, Comparative Physiology
J RosenbergA Bar
Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
J CunninghamL V Avioli
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Métabolisme
R A Corradino, J Alaimo
© 2021 Meta ULC. All rights reserved