Chapter title |
Vitamin A Absorption, Storage and Mobilization
|
---|---|
Chapter number | 4 |
Book title |
The Biochemistry of Retinoid Signaling II
|
Published in |
Sub cellular biochemistry, November 2016
|
DOI | 10.1007/978-94-024-0945-1_4 |
Pubmed ID | |
Book ISBNs |
978-9-40-240943-7, 978-9-40-240945-1
|
Authors |
William S. Blaner, Yang Li, Pierre-Jacques Brun, Jason J. Yuen, Seung-Ah Lee, Robin D. Clugston, Blaner, William S., Li, Yang, Brun, Pierre-Jacques, Yuen, Jason J., Lee, Seung-Ah, Clugston, Robin D. |
Editors |
Mary Ann Asson-Batres, Cecile Rochette-Egly |
Abstract |
It is well established that chylomicron remnant (dietary) vitamin A is taken up from the circulation by hepatocytes, but more than 80 % of the vitamin A in the liver is stored in hepatic stellate cells (HSC). It presently is not known how vitamin A is transferred from hepatocytes to HSCs for storage. Since retinol-binding protein 4 (RBP4), a protein that is required for mobilizing stored vitamin A, is synthesized solely by hepatocytes and not HSCs, it similarly is not known how vitamin A is transferred from HSCs to hepatocytes. Although it has long been thought that RBP4 is absolutely essential for delivering vitamin A to tissues, recent research has proven that this notion is incorrect since total RBP4-deficiency is not lethal. In addition to RBP4, vitamin A is also found in the circulation bound to lipoproteins and as retinoic acid bound to albumin. It is not known how these different circulating pools of vitamin A contribute to the vitamin A needs of different tissues. In our view, better insight into these three issues is required to better understand vitamin A absorption, storage and mobilization. Here, we provide an up to date synthesis of current knowledge regarding the intestinal uptake of dietary vitamin A, the storage of vitamin A within the liver, and the mobilization of hepatic vitamin A stores, and summarize areas where our understanding of these processes is incomplete. |
X Demographics
Geographical breakdown
Country | Count | As % |
---|---|---|
United States | 3 | 50% |
Luxembourg | 1 | 17% |
Unknown | 2 | 33% |
Demographic breakdown
Type | Count | As % |
---|---|---|
Members of the public | 6 | 100% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 123 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Master | 20 | 16% |
Student > Bachelor | 11 | 9% |
Researcher | 10 | 8% |
Student > Ph. D. Student | 10 | 8% |
Student > Doctoral Student | 6 | 5% |
Other | 16 | 13% |
Unknown | 50 | 41% |
Readers by discipline | Count | As % |
---|---|---|
Biochemistry, Genetics and Molecular Biology | 29 | 24% |
Medicine and Dentistry | 8 | 7% |
Agricultural and Biological Sciences | 7 | 6% |
Pharmacology, Toxicology and Pharmaceutical Science | 6 | 5% |
Nursing and Health Professions | 5 | 4% |
Other | 13 | 11% |
Unknown | 55 | 45% |