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Structure and tissue distribution of some retinoid-binding proteins
The Journal of Investigative Dermatology
|July 1, 1983
Summary
Vitamin A impacts multiple organs, affecting skin and epithelia. Researchers traced vitamin A transport and cellular uptake, identifying key binding proteins like CRBP and CRABP involved in cell differentiation and skin health.
Area of Science:
- Biochemistry
- Cell Biology
- Dermatology
Background:
- Vitamin A is crucial for vision and has systemic effects on organs.
- Deficiency manifests as epithelial keratinization and skin hyperkeratosis.
- Understanding vitamin A's generalized function requires tracing its pathway from storage to cellular uptake.
Purpose of the Study:
- To elucidate the generalized function of vitamin A.
- To trace vitamin A transport from the liver via retinol-binding protein (RBP) to cellular uptake.
- To examine intracellular vitamin A binding to specific receptor proteins.
Main Methods:
- Summarizing data on amino acid sequences of vitamin A-binding proteins.
- Investigating the homology between cellular retinoic acid-binding protein (CRABP) and cellular retinol-binding protein (CRBP).
- Analyzing the effects of retinoic acid on teratocarcinoma cell differentiation and retinoid-binding protein levels.
Main Results:
- CRBP and CRABP share homology with myelin and fatty acid-binding proteins, suggesting functional roles.
- Retinoic acid induces teratocarcinoma cell differentiation, altering CRABP and CRBP concentrations.
- Both CRBP and CRABP are present in the epidermis, with distinct cellular distributions relevant to skin structure.
Conclusions:
- Homology of CRBP and CRABP provides insights into their functions.
- Retinoic acid's influence on cell differentiation highlights the role of retinoid-binding proteins.
- Quantification and distribution of CRBP and CRABP in skin can be explored for normal and diseased states.