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First‐Pass Metabolism of Chlorophylls in Mice

AuthorsViera Alcaide, Isabel ; Chen, Kewei; Ríos, José Julián; Benito, Itziar; Pérez Gálvez, Antonio ; Roca, María
Issue DateSep-2018
PublisherJohn Wiley & Sons
CitationMolecular Nutrition and Food Research 62 (17): 1800562 (2018)
Abstract1 Scope The dietary intake of chlorophylls is estimated to be ≈50 mg d–1. However, their first pass metabolism and systemic assimilation is not well characterized. 2 Methods and results A group of 30 mice are fed a diet rich in chlorophylls, while 10 mice received a standard diet without chlorophylls (control group). Liver extracts are analyzed every 15 days by HPLC–ESI(+)/APCI(+)‐hrTOF– MS/MS to measure the accretion of specific chlorophyll metabolites. The chlorophyll profile found in the livers of mice fed a chlorophyll‐rich diet shows that the formation and/or absorption of pheophorbides, pyro‐derivatives, and phytyl‐chlorin e6 require the occurrence of a precise first‐pass metabolism. In addition, the apical absorption of pheorphorbide a‐rich micelles is significantly inhibited in Caucasian colon adenocarcinoma‐2 cells pre‐incubated with BLT1. 3 Conclusion Pheophorbide a absorption is, at least partly, protein‐mediated through SR‐BI. This active absorption process could explain the specific accumulation of pheophorbide a in the livers of animals fed a chlorophyll‐rich diet. A complementary mechanism could be the de‐esterification of pheophytin a in the liver, yielding pheophorbide a and phytol, which can explain the origin of phytol in the liver. Hence, the results suggest two molecular mechanisms responsible for the accumulation of the health‐promoting compounds pheophorbide and phytol.
Description33 Páginas; 2 Tablas; 2 Figuras
Publisher version (URL)http://dx.doi.org/10.1002/mnfr.201800562
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