HEPATIC UPTAKE, STORAGE AND RELEASE OF VITAMIN A IN HUMANS Authors: Lina N. Tamimi , HAMED R. TAKRURI, ZAINAB Z. ZAKARIA, WAEL ABU DAYYIH*
ABSTRACT
Vitamin A is an essential lipophilic biomolecule for many vital metabolic functions such as
vision, placental and embryonic development, reproduction, growth, and has a regulatory role
in the immune system. Vitamin A cannot be synthesized in the body, so its prime source is
dietary products. Moreover, it has a confirmed role as an antioxidant against oxidative stress
due to the excessive presence of free radicals as a result of multiple metabolic processes.
However, hypervitaminosis A and toxicity may occur as a consequence of ingesting large
amounts of vitamin A. So, proper intake of vitamin A, absorption, metabolismin the liver,
storage and then targeting the peripheral tissues are all crucial for the proper functioning of
the human system.The present review paper is carried out to explain the different aspects
which are related to vitamin A metabolism, storage, and release.
Keywords: Vitamin A, Retinol binding proteins, Retinoid, Chylomicrons, Hepatic
stellate cells Publication date: 01/04/2020 https://ijbpas.com/pdf/2020/April/MS_IJBPAS_2020_5053.pdfDownload PDFhttps://doi.org/10.31032/IJBPAS/2020/9.4.5053