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Extra resources for Carotenoids Part B: Metabolism, Genetics, and Biosynthesis
In the rat, only small amounts of BC enter the bloodstreamn; in mechanism (2), therefore, the unconverted BC must be reexcreted into the gut. Mechanism (2) seems the more likely in view of the work of Hollander and Ruble ~3 which showed that, in the rat, BC enters the intestinal mucosa by passive diffusion. In an attempt to distinguish between these two hypotheses, we examined the uptake kinetics of BC into a line of small intestinal cells in culture, in order to find out whether uptake into these cells is regulated.
IA. The inset represents the linear transformation of the saturation curve of retinol synthesis. The HPLC analyses were performed as described in the text. E. (Reproduced with permission from Ref. == t,- o -6~ ¢'6 ~E 60 ~8 ~tO '~. 30 0 y~ i I 0 5 10 I 15 I I 20 25 30 13-[14C]Carotene(I~M) FIo. 4. Time and concentration dependence of the conversion of ~[m+C]carotene to retinol and retinoic acid by human lung fibroblasts. (A) Synthesis of retinol (solid line) and retinoic acid (dashed line) was analyzed at various times of incubation in the presence of a fixed amount of ~-[14C]carotene (2 #M) as described in the text.
89, 9124 (1989). 9 S. Hansen and W. Maret, Biochemistry 27, 200 (1988). so j. L. Napoli and K. R. Race, J. Biol. Chem. 257, 13385 (1988). METHODS IN ENZYMOLOGY, VOL. 214 ~ t O 1993by AcademicPre~ Inc. All rightsof reproductionin any form reserved.  p-CAROTENE IN CELL CULTURE 21 especially that of the face (zygomatic prominence), hands, elbows, knees, and feet. " More objective assessments may be made through the use of reflectometers.  U p t a k e a n d C l e a v a g e o f , 8 - C a r o t e n e b y C u l t u r e s o f Rat Small Intestinal Cells and Human Lung Fibroblasts B y GIORGIO SCITA, GREGORY W .