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Studies on fatty acid-binding proteins. Changes in the concentration of hepatic fatty acid-binding protein during
Insights
Hepatic fatty acid-binding protein (FABP) concentration significantly increases 20-fold from fetal to adult stages in rats. This key developmental change in FABP levels was confirmed using fluorescence enhancement and immunoblotting techniques.
Area of Science:
- Biochemistry
- Developmental Biology
- Molecular Biology
Background:
- Hepatic fatty acid-binding protein (FABP) plays a crucial role in cellular lipid metabolism.
- Understanding FABP expression during development is vital for comprehending liver maturation and function.
Purpose of the Study:
- To quantify hepatic fatty acid-binding protein (FABP) concentrations in rat livers across different developmental stages.
- To investigate the developmental profile of FABP and identify potential alternative binding proteins in fetal liver.
Main Methods:
- Quantification of FABP using fluorescence enhancement with the probe 11-(dansylamino)-undecanoic acid.
- Confirmation of protein concentration changes via immuno-blotting.
- Analysis of fetal cytosol using high-performance liquid chromatography (HPLC).
Main Results:
- A significant 20-fold increase in hepatic FABP concentration was observed from fetal to adult stages.
- Immuno-blotting confirmed the substantial rise in FABP levels during development.
- No other proteins in the 14,000-Mr range were detected in fetal liver samples.
- HPLC analysis did not reveal alternative FABPs in fetal cytosol via fluorescence enhancement.
Conclusions:
- Hepatic FABP concentration undergoes a dramatic increase during rat development, from fetal to adult stages.
- The developmental increase in FABP is a specific phenomenon, with no other similar-sized proteins detected in the fetus.
- The fluorescence-enhancement method did not identify alternative fatty acid-binding proteins in the fetal liver.
Abstract:
The concentration of hepatic fatty acid-binding protein was determined in the livers of rats at various stages of development from foetus to young adult. Fatty acid-binding protein concentrations were determined by quantifying the fluorescence enhancement on the binding of the fluorescent probe 11-(dansylamino)-undecanoic acid. A 20-fold increase in the concentration of the protein was observed between the foetus and adult, and this increase was confirmed by immuno-blotting. No other protein in the 14,000-Mr range was observed in the foetus. Possible alternative fatty acid-binding proteins could not be detected in h.p.l.c.-fractionated foetal cytosol by the fluorescence-enhancement method.