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2012 ; 5
(4
): 603-11
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Protection of humans by plant glucosinolates: efficiency of conversion of
glucosinolates to isothiocyanates by the gastrointestinal microflora
#MMPMID22318753
Fahey JW
; Wehage SL
; Holtzclaw WD
; Kensler TW
; Egner PA
; Shapiro TA
; Talalay P
Cancer Prev Res (Phila)
2012[Apr]; 5
(4
): 603-11
PMID22318753
show ga
Plant-based diets rich in crucifers are effective in preventing cancer and other
chronic diseases. Crucifers contain very high concentrations of glucosinolates
(GS; ?-thioglucoside-N-hydroxysulfates). Although not themselves protective, GS
are converted by coexisting myrosinases to bitter isothiocyanates (ITC) which
defend plants against predators. Coincidentally, ITC also induce mammalian genes
that regulate defenses against oxidative stress, inflammation, and DNA-damaging
electrophiles. Consequently, the efficiency of conversion of GS to ITC may be
critical in controlling the health-promoting benefits of crucifers. If myrosinase
is heat-inactivated by cooking, the gastrointestinal microflora converts GS to
ITC, a process abolished by enteric antibiotics and bowel cleansing. When single
oral doses of GS were administered as broccoli sprout extracts (BSE) to two
dissimilar populations (rural Han Chinese and racially mixed Baltimoreans)
patterns of excretions of urinary dithiocarbamates (DTC) were very similar.
Individual conversions in both populations varied enormously, from about 1% to
more than 40% of dose. In contrast, administration of ITC (largely
sulforaphane)-containing BSE resulted in uniformly high (70%-90%) conversions to
urinary DTC. Despite the remarkably large range of conversion efficiencies
between individuals, repeated determinations within individuals were much more
consistent. The rates of urinary excretion (slow or fast) were unrelated to the
ultimate magnitudes (low or high) of these conversions. Although no demographic
factors affecting conversion efficiency have been identified, there are clearly
diurnal variations: conversion of GS to DTC was greater during the day, but
conversion of ITC to DTC was more efficient at night.