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Contribution of cellular retinol‐binding protein type 1 to retinol metabolism during mouse development
Author(s) -
Matt Nicolas,
Schmidt Carsten K.,
Dupé Valérie,
Dennefeld Christine,
Nau Heinz,
Chambon Pierre,
Mark Manuel,
Ghyselinck Norbert B.
Publication year - 2005
Publication title -
developmental dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.634
H-Index - 141
eISSN - 1097-0177
pISSN - 1058-8388
DOI - 10.1002/dvdy.20313
Subject(s) - biology , retinol , retinoic acid , retinoid , vitamin , vitamin a deficiency , fetus , retinol binding protein , endocrinology , medicine , embryogenesis , andrology , embryo , gene , biochemistry , microbiology and biotechnology , genetics , pregnancy
Within cells, retinol (ROL) is bound to cytoplasmic proteins (cellular retinol‐binding proteins [CRBPs]), whose proposed function is to protect it from unspecific enzymes through channeling to retinoid‐metabolizing pathways. We show that, during development, ROL and retinyl ester levels are decreased in CRBP type 1 (CRBP1) ‐deficient embryos and fetuses by 50% and 80%, respectively. The steady state level of retinoic acid (RA) is also decreased but to a lesser extent. However, CRBP1‐null fetuses do not exhibit the abnormalities characteristic of a vitamin A‐deficiency syndrome. Neither CRBP1 deficiency alters the expression patterns of RA‐responding genes during development, nor does CRBP1 availability modify the expression of an RA‐dependent gene in primary embryonic fibroblasts treated with ROL. Therefore, CRBP1 is required in prenatal life to maintain normal amounts of ROL and to ensure its efficient storage but seems of secondary importance for RA synthesis, at least under conditions of maternal vitamin A sufficiency. Developmental Dynamics 233:167–176, 2005. © 2005 Wiley‐Liss, Inc.